./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/float-benchs/rlim_exit.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/float-benchs/rlim_exit.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P --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 d77357c243d95f35d00bc89e7fc23b91d82935f320cfab6cb2f6a7d192f5b03f --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:44:01,204 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:44:01,206 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:44:01,242 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:44:01,243 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:44:01,245 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:44:01,247 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:44:01,250 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:44:01,252 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:44:01,253 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:44:01,254 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:44:01,256 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:44:01,257 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:44:01,258 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:44:01,260 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:44:01,261 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:44:01,263 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:44:01,264 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:44:01,266 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:44:01,269 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:44:01,270 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:44:01,272 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:44:01,274 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:44:01,275 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:44:01,278 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:44:01,279 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:44:01,279 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:44:01,280 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:44:01,281 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:44:01,282 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:44:01,283 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:44:01,284 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:44:01,285 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:44:01,286 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:44:01,287 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:44:01,288 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:44:01,289 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:44:01,289 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:44:01,290 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:44:01,291 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:44:01,292 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:44:01,293 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 00:44:01,335 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:44:01,336 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:44:01,337 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:44:01,337 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:44:01,343 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:44:01,344 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:44:01,344 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:44:01,344 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:44:01,344 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:44:01,345 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:44:01,346 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:44:01,346 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:44:01,346 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:44:01,346 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:44:01,347 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:44:01,347 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:44:01,347 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:44:01,347 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:44:01,348 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:44:01,348 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:44:01,349 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:44:01,349 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:44:01,349 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:44:01,349 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 00:44:01,350 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:44:01,350 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 00:44:01,350 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:44:01,350 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 00:44:01,350 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:44:01,351 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 00:44:01,351 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:44:01,351 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:44:01,352 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:44:01,352 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:44:01,352 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:44:01,352 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 00:44:01,353 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:44:01,353 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:44:01,353 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 00:44:01,353 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:44:01,354 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:44:01,354 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_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d77357c243d95f35d00bc89e7fc23b91d82935f320cfab6cb2f6a7d192f5b03f [2021-11-21 00:44:01,588 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:44:01,623 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:44:01,626 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:44:01,627 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:44:01,628 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:44:01,629 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/float-benchs/rlim_exit.c [2021-11-21 00:44:01,728 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/data/4366a7079/6417e96875b9453a8d3d2f1433aa1dcc/FLAG944db0e2d [2021-11-21 00:44:02,138 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:44:02,139 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/sv-benchmarks/c/float-benchs/rlim_exit.c [2021-11-21 00:44:02,145 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/data/4366a7079/6417e96875b9453a8d3d2f1433aa1dcc/FLAG944db0e2d [2021-11-21 00:44:02,557 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/data/4366a7079/6417e96875b9453a8d3d2f1433aa1dcc [2021-11-21 00:44:02,559 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:44:02,561 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:44:02,565 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:44:02,566 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:44:02,569 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:44:02,570 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:44:02" (1/1) ... [2021-11-21 00:44:02,571 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1a783047 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:44:02, skipping insertion in model container [2021-11-21 00:44:02,571 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:44:02" (1/1) ... [2021-11-21 00:44:02,579 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:44:02,590 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:44:02,736 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/sv-benchmarks/c/float-benchs/rlim_exit.c[446,459] [2021-11-21 00:44:02,754 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:44:02,761 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:44:02,773 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/sv-benchmarks/c/float-benchs/rlim_exit.c[446,459] [2021-11-21 00:44:02,778 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:44:02,790 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:44:02,791 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:44:02 WrapperNode [2021-11-21 00:44:02,791 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:44:02,792 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:44:02,792 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:44:02,792 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:44:02,800 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:44:02" (1/1) ... [2021-11-21 00:44:02,807 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:44:02" (1/1) ... [2021-11-21 00:44:02,824 INFO L137 Inliner]: procedures = 14, calls = 10, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 47 [2021-11-21 00:44:02,824 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:44:02,825 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:44:02,825 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:44:02,825 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:44:02,833 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:44:02" (1/1) ... [2021-11-21 00:44:02,833 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:44:02" (1/1) ... [2021-11-21 00:44:02,834 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:44:02" (1/1) ... [2021-11-21 00:44:02,834 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:44:02" (1/1) ... [2021-11-21 00:44:02,838 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:44:02" (1/1) ... [2021-11-21 00:44:02,842 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:44:02" (1/1) ... [2021-11-21 00:44:02,843 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:44:02" (1/1) ... [2021-11-21 00:44:02,844 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:44:02,845 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:44:02,845 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:44:02,845 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:44:02,846 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:44:02" (1/1) ... [2021-11-21 00:44:02,853 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:44:02,863 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:44:02,875 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:44:02,903 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:44:02,951 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:44:02,951 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-21 00:44:02,951 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-21 00:44:02,952 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 00:44:02,952 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:44:02,952 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:44:03,022 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:44:03,023 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:44:03,135 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:44:03,175 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:44:03,175 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-21 00:44:03,179 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:44:03 BoogieIcfgContainer [2021-11-21 00:44:03,179 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:44:03,181 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:44:03,181 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:44:03,184 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:44:03,184 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:44:02" (1/3) ... [2021-11-21 00:44:03,185 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61f00e04 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:44:03, skipping insertion in model container [2021-11-21 00:44:03,185 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:44:02" (2/3) ... [2021-11-21 00:44:03,185 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61f00e04 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:44:03, skipping insertion in model container [2021-11-21 00:44:03,185 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:44:03" (3/3) ... [2021-11-21 00:44:03,186 INFO L111 eAbstractionObserver]: Analyzing ICFG rlim_exit.c [2021-11-21 00:44:03,192 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:44:03,192 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 00:44:03,268 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:44:03,284 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 00:44:03,284 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 00:44:03,306 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 8 states have internal predecessors, (10), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 00:44:03,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-21 00:44:03,311 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:44:03,311 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-21 00:44:03,312 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:44:03,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:44:03,317 INFO L85 PathProgramCache]: Analyzing trace with hash 2680294, now seen corresponding path program 1 times [2021-11-21 00:44:03,327 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:44:03,327 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [546624024] [2021-11-21 00:44:03,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:44:03,328 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:44:03,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:44:03,460 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:44:03,460 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:44:03,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [546624024] [2021-11-21 00:44:03,461 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [546624024] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:44:03,462 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:44:03,462 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:44:03,464 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374887539] [2021-11-21 00:44:03,464 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:44:03,468 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:44:03,469 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:44:03,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:44:03,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:44:03,498 INFO L87 Difference]: Start difference. First operand has 12 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 8 states have internal predecessors, (10), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:44:03,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:44:03,533 INFO L93 Difference]: Finished difference Result 21 states and 26 transitions. [2021-11-21 00:44:03,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:44:03,536 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-11-21 00:44:03,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:44:03,542 INFO L225 Difference]: With dead ends: 21 [2021-11-21 00:44:03,542 INFO L226 Difference]: Without dead ends: 14 [2021-11-21 00:44:03,545 INFO L932 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 [2021-11-21 00:44:03,549 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 1 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:44:03,550 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 16 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:44:03,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-11-21 00:44:03,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 11. [2021-11-21 00:44:03,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 states have internal predecessors, (8), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 00:44:03,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2021-11-21 00:44:03,592 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 4 [2021-11-21 00:44:03,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:44:03,592 INFO L470 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2021-11-21 00:44:03,593 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:44:03,593 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2021-11-21 00:44:03,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-21 00:44:03,594 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:44:03,594 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:44:03,595 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:44:03,595 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:44:03,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:44:03,596 INFO L85 PathProgramCache]: Analyzing trace with hash -695491792, now seen corresponding path program 1 times [2021-11-21 00:44:03,607 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:44:03,607 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [935980131] [2021-11-21 00:44:03,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:44:03,608 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:44:03,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:44:03,697 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 00:44:03,712 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:44:03,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [935980131] [2021-11-21 00:44:03,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [935980131] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:44:03,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [659863295] [2021-11-21 00:44:03,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:44:03,713 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:44:03,713 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:44:03,728 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:44:03,738 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:44:03,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:44:03,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:44:03,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:44:03,874 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 00:44:03,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:44:03,936 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 00:44:03,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [659863295] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:44:03,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1497396989] [2021-11-21 00:44:03,956 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 00:44:03,957 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:44:03,961 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:44:03,967 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:44:03,967 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:44:06,619 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:44:06,636 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:44:06,917 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:44:06,917 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:44:06,917 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-21 00:44:06,918 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2119983112] [2021-11-21 00:44:06,918 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:44:06,919 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:44:06,919 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:44:06,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:44:06,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2021-11-21 00:44:06,920 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 7 states have internal predecessors, (14), 3 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-21 00:44:06,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:44:06,985 INFO L93 Difference]: Finished difference Result 26 states and 35 transitions. [2021-11-21 00:44:06,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:44:06,986 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 7 states have internal predecessors, (14), 3 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 12 [2021-11-21 00:44:06,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:44:06,988 INFO L225 Difference]: With dead ends: 26 [2021-11-21 00:44:06,988 INFO L226 Difference]: Without dead ends: 23 [2021-11-21 00:44:06,990 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2021-11-21 00:44:06,992 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 6 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:44:06,994 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 20 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:44:06,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-21 00:44:07,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-11-21 00:44:07,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 13 states have (on average 1.0769230769230769) internal successors, (14), 13 states have internal predecessors, (14), 8 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-21 00:44:07,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 30 transitions. [2021-11-21 00:44:07,010 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 30 transitions. Word has length 12 [2021-11-21 00:44:07,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:44:07,010 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 30 transitions. [2021-11-21 00:44:07,011 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 7 states have internal predecessors, (14), 3 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-21 00:44:07,011 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 30 transitions. [2021-11-21 00:44:07,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-21 00:44:07,014 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:44:07,014 INFO L514 BasicCegarLoop]: trace histogram [8, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1] [2021-11-21 00:44:07,045 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-21 00:44:07,227 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:44:07,227 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:44:07,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:44:07,228 INFO L85 PathProgramCache]: Analyzing trace with hash 1212047118, now seen corresponding path program 2 times [2021-11-21 00:44:07,228 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:44:07,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1062696908] [2021-11-21 00:44:07,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:44:07,229 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:44:07,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:44:07,385 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-21 00:44:07,385 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:44:07,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1062696908] [2021-11-21 00:44:07,386 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1062696908] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:44:07,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [594922308] [2021-11-21 00:44:07,393 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:44:07,393 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:44:07,394 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:44:07,395 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:44:07,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:44:07,464 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-21 00:44:07,465 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:44:07,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:44:07,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:44:07,549 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-21 00:44:07,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:44:07,675 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-21 00:44:07,676 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [594922308] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:44:07,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1731651547] [2021-11-21 00:44:07,684 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 00:44:07,684 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:44:07,685 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:44:07,686 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:44:07,686 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:44:09,619 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 00:44:09,645 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:44:09,941 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:44:09,941 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:44:09,941 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2021-11-21 00:44:09,941 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613907026] [2021-11-21 00:44:09,942 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:44:09,942 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 00:44:09,942 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:44:09,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 00:44:09,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=314, Unknown=0, NotChecked=0, Total=420 [2021-11-21 00:44:09,943 INFO L87 Difference]: Start difference. First operand 23 states and 30 transitions. Second operand has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 9 states have call successors, (18), 1 states have call predecessors, (18), 1 states have return successors, (18), 9 states have call predecessors, (18), 9 states have call successors, (18) [2021-11-21 00:44:10,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:44:10,053 INFO L93 Difference]: Finished difference Result 50 states and 74 transitions. [2021-11-21 00:44:10,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 00:44:10,053 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 9 states have call successors, (18), 1 states have call predecessors, (18), 1 states have return successors, (18), 9 states have call predecessors, (18), 9 states have call successors, (18) Word has length 36 [2021-11-21 00:44:10,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:44:10,055 INFO L225 Difference]: With dead ends: 50 [2021-11-21 00:44:10,055 INFO L226 Difference]: Without dead ends: 47 [2021-11-21 00:44:10,056 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=106, Invalid=314, Unknown=0, NotChecked=0, Total=420 [2021-11-21 00:44:10,057 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 15 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:44:10,058 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 44 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:44:10,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-21 00:44:10,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-11-21 00:44:10,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 25 states have (on average 1.04) internal successors, (26), 25 states have internal predecessors, (26), 20 states have call successors, (20), 1 states have call predecessors, (20), 1 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-21 00:44:10,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 66 transitions. [2021-11-21 00:44:10,070 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 66 transitions. Word has length 36 [2021-11-21 00:44:10,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:44:10,071 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 66 transitions. [2021-11-21 00:44:10,071 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 9 states have call successors, (18), 1 states have call predecessors, (18), 1 states have return successors, (18), 9 states have call predecessors, (18), 9 states have call successors, (18) [2021-11-21 00:44:10,071 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 66 transitions. [2021-11-21 00:44:10,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-21 00:44:10,075 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:44:10,075 INFO L514 BasicCegarLoop]: trace histogram [20, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1] [2021-11-21 00:44:10,112 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:44:10,299 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:44:10,299 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:44:10,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:44:10,300 INFO L85 PathProgramCache]: Analyzing trace with hash -795399990, now seen corresponding path program 3 times [2021-11-21 00:44:10,300 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:44:10,300 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1384943906] [2021-11-21 00:44:10,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:44:10,300 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:44:10,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:44:10,536 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2021-11-21 00:44:10,537 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:44:10,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1384943906] [2021-11-21 00:44:10,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1384943906] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:44:10,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [686655149] [2021-11-21 00:44:10,537 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:44:10,538 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:44:10,538 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:44:10,541 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:44:10,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:44:10,635 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:44:10,635 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:44:10,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 00:44:10,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:44:10,816 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2021-11-21 00:44:10,817 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:44:11,177 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2021-11-21 00:44:11,177 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [686655149] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:44:11,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [894973179] [2021-11-21 00:44:11,180 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 00:44:11,180 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:44:11,181 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:44:11,181 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:44:11,181 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:44:13,029 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:44:13,043 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:44:13,326 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:44:13,326 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:44:13,327 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2021-11-21 00:44:13,327 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702301034] [2021-11-21 00:44:13,327 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:44:13,328 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-21 00:44:13,328 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:44:13,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-21 00:44:13,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=328, Invalid=728, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 00:44:13,330 INFO L87 Difference]: Start difference. First operand 47 states and 66 transitions. Second operand has 25 states, 25 states have (on average 2.0) internal successors, (50), 25 states have internal predecessors, (50), 21 states have call successors, (42), 1 states have call predecessors, (42), 1 states have return successors, (42), 21 states have call predecessors, (42), 21 states have call successors, (42) [2021-11-21 00:44:13,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:44:13,565 INFO L93 Difference]: Finished difference Result 98 states and 152 transitions. [2021-11-21 00:44:13,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-21 00:44:13,565 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.0) internal successors, (50), 25 states have internal predecessors, (50), 21 states have call successors, (42), 1 states have call predecessors, (42), 1 states have return successors, (42), 21 states have call predecessors, (42), 21 states have call successors, (42) Word has length 84 [2021-11-21 00:44:13,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:44:13,568 INFO L225 Difference]: With dead ends: 98 [2021-11-21 00:44:13,568 INFO L226 Difference]: Without dead ends: 95 [2021-11-21 00:44:13,569 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 232 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=328, Invalid=728, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 00:44:13,570 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 22 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:44:13,570 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 80 Invalid, 274 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 220 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:44:13,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-21 00:44:13,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2021-11-21 00:44:13,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 49 states have (on average 1.0204081632653061) internal successors, (50), 49 states have internal predecessors, (50), 44 states have call successors, (44), 1 states have call predecessors, (44), 1 states have return successors, (44), 44 states have call predecessors, (44), 44 states have call successors, (44) [2021-11-21 00:44:13,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 138 transitions. [2021-11-21 00:44:13,590 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 138 transitions. Word has length 84 [2021-11-21 00:44:13,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:44:13,591 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 138 transitions. [2021-11-21 00:44:13,591 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.0) internal successors, (50), 25 states have internal predecessors, (50), 21 states have call successors, (42), 1 states have call predecessors, (42), 1 states have return successors, (42), 21 states have call predecessors, (42), 21 states have call successors, (42) [2021-11-21 00:44:13,591 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 138 transitions. [2021-11-21 00:44:13,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2021-11-21 00:44:13,597 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:44:13,597 INFO L514 BasicCegarLoop]: trace histogram [44, 22, 22, 22, 22, 22, 22, 1, 1, 1, 1] [2021-11-21 00:44:13,634 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:44:13,823 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:44:13,823 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:44:13,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:44:13,824 INFO L85 PathProgramCache]: Analyzing trace with hash 1184760898, now seen corresponding path program 4 times [2021-11-21 00:44:13,824 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:44:13,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1074438226] [2021-11-21 00:44:13,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:44:13,824 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:44:13,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:44:14,255 INFO L134 CoverageAnalysis]: Checked inductivity of 2838 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 1892 trivial. 0 not checked. [2021-11-21 00:44:14,256 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:44:14,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1074438226] [2021-11-21 00:44:14,256 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1074438226] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:44:14,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [653235745] [2021-11-21 00:44:14,256 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:44:14,257 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:44:14,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:44:14,258 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:44:14,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:44:14,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:44:14,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 607 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-21 00:44:14,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:44:14,755 INFO L134 CoverageAnalysis]: Checked inductivity of 2838 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 1892 trivial. 0 not checked. [2021-11-21 00:44:14,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:44:15,762 INFO L134 CoverageAnalysis]: Checked inductivity of 2838 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 1892 trivial. 0 not checked. [2021-11-21 00:44:15,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [653235745] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:44:15,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [200581467] [2021-11-21 00:44:15,765 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 00:44:15,765 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:44:15,766 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:44:15,766 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:44:15,766 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:44:17,452 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:44:17,466 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:44:17,779 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:44:17,779 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:44:17,780 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2021-11-21 00:44:17,780 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955180842] [2021-11-21 00:44:17,780 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:44:17,782 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-21 00:44:17,782 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:44:17,783 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-21 00:44:17,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1204, Invalid=1988, Unknown=0, NotChecked=0, Total=3192 [2021-11-21 00:44:17,785 INFO L87 Difference]: Start difference. First operand 95 states and 138 transitions. Second operand has 49 states, 49 states have (on average 2.0) internal successors, (98), 49 states have internal predecessors, (98), 45 states have call successors, (90), 1 states have call predecessors, (90), 1 states have return successors, (90), 45 states have call predecessors, (90), 45 states have call successors, (90) [2021-11-21 00:44:18,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:44:18,237 INFO L93 Difference]: Finished difference Result 194 states and 308 transitions. [2021-11-21 00:44:18,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-21 00:44:18,238 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.0) internal successors, (98), 49 states have internal predecessors, (98), 45 states have call successors, (90), 1 states have call predecessors, (90), 1 states have return successors, (90), 45 states have call predecessors, (90), 45 states have call successors, (90) Word has length 180 [2021-11-21 00:44:18,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:44:18,250 INFO L225 Difference]: With dead ends: 194 [2021-11-21 00:44:18,250 INFO L226 Difference]: Without dead ends: 191 [2021-11-21 00:44:18,252 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 563 GetRequests, 508 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 655 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1204, Invalid=1988, Unknown=0, NotChecked=0, Total=3192 [2021-11-21 00:44:18,255 INFO L933 BasicCegarLoop]: 96 mSDtfsCounter, 69 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 394 mSolverCounterSat, 162 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 556 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 162 IncrementalHoareTripleChecker+Valid, 394 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:44:18,255 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 108 Invalid, 556 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [162 Valid, 394 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:44:18,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-11-21 00:44:18,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 191. [2021-11-21 00:44:18,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 97 states have (on average 1.0103092783505154) internal successors, (98), 97 states have internal predecessors, (98), 92 states have call successors, (92), 1 states have call predecessors, (92), 1 states have return successors, (92), 92 states have call predecessors, (92), 92 states have call successors, (92) [2021-11-21 00:44:18,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 282 transitions. [2021-11-21 00:44:18,308 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 282 transitions. Word has length 180 [2021-11-21 00:44:18,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:44:18,309 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 282 transitions. [2021-11-21 00:44:18,310 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.0) internal successors, (98), 49 states have internal predecessors, (98), 45 states have call successors, (90), 1 states have call predecessors, (90), 1 states have return successors, (90), 45 states have call predecessors, (90), 45 states have call successors, (90) [2021-11-21 00:44:18,310 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 282 transitions. [2021-11-21 00:44:18,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 373 [2021-11-21 00:44:18,322 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:44:18,323 INFO L514 BasicCegarLoop]: trace histogram [92, 46, 46, 46, 46, 46, 46, 1, 1, 1, 1] [2021-11-21 00:44:18,358 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 00:44:18,523 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:44:18,523 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:44:18,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:44:18,524 INFO L85 PathProgramCache]: Analyzing trace with hash -2076124366, now seen corresponding path program 5 times [2021-11-21 00:44:18,524 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:44:18,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [684073365] [2021-11-21 00:44:18,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:44:18,524 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:44:18,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:44:19,882 INFO L134 CoverageAnalysis]: Checked inductivity of 12558 backedges. 0 proven. 4186 refuted. 0 times theorem prover too weak. 8372 trivial. 0 not checked. [2021-11-21 00:44:19,882 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:44:19,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [684073365] [2021-11-21 00:44:19,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [684073365] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:44:19,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1554020120] [2021-11-21 00:44:19,883 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:44:19,883 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:44:19,883 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:44:19,887 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:44:19,892 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 00:44:20,377 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 63 check-sat command(s) [2021-11-21 00:44:20,377 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:44:20,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 1231 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-21 00:44:20,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:44:21,126 INFO L134 CoverageAnalysis]: Checked inductivity of 12558 backedges. 0 proven. 4186 refuted. 0 times theorem prover too weak. 8372 trivial. 0 not checked. [2021-11-21 00:44:21,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:44:24,301 INFO L134 CoverageAnalysis]: Checked inductivity of 12558 backedges. 0 proven. 4186 refuted. 0 times theorem prover too weak. 8372 trivial. 0 not checked. [2021-11-21 00:44:24,301 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1554020120] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:44:24,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [126259428] [2021-11-21 00:44:24,303 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 00:44:24,303 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:44:24,304 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:44:24,304 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:44:24,304 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:44:25,940 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:44:25,956 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:44:26,361 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:44:26,361 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:44:26,362 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2021-11-21 00:44:26,362 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145746429] [2021-11-21 00:44:26,362 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:44:26,364 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2021-11-21 00:44:26,365 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:44:26,366 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-11-21 00:44:26,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4684, Invalid=6236, Unknown=0, NotChecked=0, Total=10920 [2021-11-21 00:44:26,371 INFO L87 Difference]: Start difference. First operand 191 states and 282 transitions. Second operand has 97 states, 97 states have (on average 2.0) internal successors, (194), 97 states have internal predecessors, (194), 93 states have call successors, (186), 1 states have call predecessors, (186), 1 states have return successors, (186), 93 states have call predecessors, (186), 93 states have call successors, (186) [2021-11-21 00:44:27,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:44:27,363 INFO L93 Difference]: Finished difference Result 386 states and 620 transitions. [2021-11-21 00:44:27,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-11-21 00:44:27,364 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 2.0) internal successors, (194), 97 states have internal predecessors, (194), 93 states have call successors, (186), 1 states have call predecessors, (186), 1 states have return successors, (186), 93 states have call predecessors, (186), 93 states have call successors, (186) Word has length 372 [2021-11-21 00:44:27,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:44:27,371 INFO L225 Difference]: With dead ends: 386 [2021-11-21 00:44:27,371 INFO L226 Difference]: Without dead ends: 383 [2021-11-21 00:44:27,375 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1163 GetRequests, 1060 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1327 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=4684, Invalid=6236, Unknown=0, NotChecked=0, Total=10920 [2021-11-21 00:44:27,376 INFO L933 BasicCegarLoop]: 192 mSDtfsCounter, 141 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 926 mSolverCounterSat, 331 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 1257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 331 IncrementalHoareTripleChecker+Valid, 926 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-21 00:44:27,376 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [145 Valid, 212 Invalid, 1257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [331 Valid, 926 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-21 00:44:27,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2021-11-21 00:44:27,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 383. [2021-11-21 00:44:27,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 383 states, 193 states have (on average 1.005181347150259) internal successors, (194), 193 states have internal predecessors, (194), 188 states have call successors, (188), 1 states have call predecessors, (188), 1 states have return successors, (188), 188 states have call predecessors, (188), 188 states have call successors, (188) [2021-11-21 00:44:27,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 383 states to 383 states and 570 transitions. [2021-11-21 00:44:27,442 INFO L78 Accepts]: Start accepts. Automaton has 383 states and 570 transitions. Word has length 372 [2021-11-21 00:44:27,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:44:27,444 INFO L470 AbstractCegarLoop]: Abstraction has 383 states and 570 transitions. [2021-11-21 00:44:27,445 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 2.0) internal successors, (194), 97 states have internal predecessors, (194), 93 states have call successors, (186), 1 states have call predecessors, (186), 1 states have return successors, (186), 93 states have call predecessors, (186), 93 states have call successors, (186) [2021-11-21 00:44:27,445 INFO L276 IsEmpty]: Start isEmpty. Operand 383 states and 570 transitions. [2021-11-21 00:44:27,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 757 [2021-11-21 00:44:27,478 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:44:27,479 INFO L514 BasicCegarLoop]: trace histogram [188, 94, 94, 94, 94, 94, 94, 1, 1, 1, 1] [2021-11-21 00:44:27,523 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 00:44:27,695 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-21 00:44:27,695 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:44:27,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:44:27,696 INFO L85 PathProgramCache]: Analyzing trace with hash 668666130, now seen corresponding path program 6 times [2021-11-21 00:44:27,696 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:44:27,696 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1357315806] [2021-11-21 00:44:27,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:44:27,696 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:44:27,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:44:31,389 INFO L134 CoverageAnalysis]: Checked inductivity of 52734 backedges. 0 proven. 17578 refuted. 0 times theorem prover too weak. 35156 trivial. 0 not checked. [2021-11-21 00:44:31,390 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:44:31,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1357315806] [2021-11-21 00:44:31,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1357315806] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:44:31,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [631474267] [2021-11-21 00:44:31,391 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:44:31,391 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:44:31,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:44:31,393 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:44:31,395 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 00:44:31,919 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:44:31,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:44:31,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 2479 conjuncts, 96 conjunts are in the unsatisfiable core [2021-11-21 00:44:31,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:44:33,540 INFO L134 CoverageAnalysis]: Checked inductivity of 52734 backedges. 0 proven. 17578 refuted. 0 times theorem prover too weak. 35156 trivial. 0 not checked. [2021-11-21 00:44:33,540 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:44:44,424 INFO L134 CoverageAnalysis]: Checked inductivity of 52734 backedges. 0 proven. 17578 refuted. 0 times theorem prover too weak. 35156 trivial. 0 not checked. [2021-11-21 00:44:44,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [631474267] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:44:44,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [304509243] [2021-11-21 00:44:44,427 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 00:44:44,427 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:44:44,428 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:44:44,428 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:44:44,428 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:44:46,464 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 00:44:46,492 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:44:47,238 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:44:47,239 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:44:47,239 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 193 [2021-11-21 00:44:47,239 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554439332] [2021-11-21 00:44:47,240 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:44:47,242 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 193 states [2021-11-21 00:44:47,242 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:44:47,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 193 interpolants. [2021-11-21 00:44:47,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18556, Invalid=21644, Unknown=0, NotChecked=0, Total=40200 [2021-11-21 00:44:47,257 INFO L87 Difference]: Start difference. First operand 383 states and 570 transitions. Second operand has 193 states, 193 states have (on average 2.0) internal successors, (386), 193 states have internal predecessors, (386), 189 states have call successors, (378), 1 states have call predecessors, (378), 1 states have return successors, (378), 189 states have call predecessors, (378), 189 states have call successors, (378) [2021-11-21 00:44:49,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:44:49,698 INFO L93 Difference]: Finished difference Result 770 states and 1244 transitions. [2021-11-21 00:44:49,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 192 states. [2021-11-21 00:44:49,700 INFO L78 Accepts]: Start accepts. Automaton has has 193 states, 193 states have (on average 2.0) internal successors, (386), 193 states have internal predecessors, (386), 189 states have call successors, (378), 1 states have call predecessors, (378), 1 states have return successors, (378), 189 states have call predecessors, (378), 189 states have call successors, (378) Word has length 756 [2021-11-21 00:44:49,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:44:49,708 INFO L225 Difference]: With dead ends: 770 [2021-11-21 00:44:49,708 INFO L226 Difference]: Without dead ends: 767 [2021-11-21 00:44:49,712 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2363 GetRequests, 2164 SyntacticMatches, 0 SemanticMatches, 199 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2671 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=18556, Invalid=21644, Unknown=0, NotChecked=0, Total=40200 [2021-11-21 00:44:49,713 INFO L933 BasicCegarLoop]: 384 mSDtfsCounter, 285 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 2364 mSolverCounterSat, 667 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 289 SdHoareTripleChecker+Valid, 392 SdHoareTripleChecker+Invalid, 3031 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 667 IncrementalHoareTripleChecker+Valid, 2364 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-21 00:44:49,714 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [289 Valid, 392 Invalid, 3031 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [667 Valid, 2364 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2021-11-21 00:44:49,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 767 states. [2021-11-21 00:44:49,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 767 to 767. [2021-11-21 00:44:49,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 767 states, 385 states have (on average 1.0025974025974025) internal successors, (386), 385 states have internal predecessors, (386), 380 states have call successors, (380), 1 states have call predecessors, (380), 1 states have return successors, (380), 380 states have call predecessors, (380), 380 states have call successors, (380) [2021-11-21 00:44:49,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 767 states to 767 states and 1146 transitions. [2021-11-21 00:44:49,774 INFO L78 Accepts]: Start accepts. Automaton has 767 states and 1146 transitions. Word has length 756 [2021-11-21 00:44:49,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:44:49,777 INFO L470 AbstractCegarLoop]: Abstraction has 767 states and 1146 transitions. [2021-11-21 00:44:49,779 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 193 states, 193 states have (on average 2.0) internal successors, (386), 193 states have internal predecessors, (386), 189 states have call successors, (378), 1 states have call predecessors, (378), 1 states have return successors, (378), 189 states have call predecessors, (378), 189 states have call successors, (378) [2021-11-21 00:44:49,779 INFO L276 IsEmpty]: Start isEmpty. Operand 767 states and 1146 transitions. [2021-11-21 00:44:49,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1525 [2021-11-21 00:44:49,828 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:44:49,828 INFO L514 BasicCegarLoop]: trace histogram [380, 190, 190, 190, 190, 190, 190, 1, 1, 1, 1] [2021-11-21 00:44:49,852 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-21 00:44:50,029 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:44:50,032 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:44:50,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:44:50,032 INFO L85 PathProgramCache]: Analyzing trace with hash 543253714, now seen corresponding path program 7 times [2021-11-21 00:44:50,033 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:44:50,033 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2003524530] [2021-11-21 00:44:50,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:44:50,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:44:50,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:45:04,422 INFO L134 CoverageAnalysis]: Checked inductivity of 216030 backedges. 0 proven. 72010 refuted. 0 times theorem prover too weak. 144020 trivial. 0 not checked. [2021-11-21 00:45:04,423 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:45:04,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2003524530] [2021-11-21 00:45:04,423 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2003524530] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:45:04,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2096906903] [2021-11-21 00:45:04,424 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:45:04,424 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:45:04,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:45:04,439 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:45:04,441 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 00:45:05,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:45:05,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 4975 conjuncts, 192 conjunts are in the unsatisfiable core [2021-11-21 00:45:05,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:45:08,344 INFO L134 CoverageAnalysis]: Checked inductivity of 216030 backedges. 0 proven. 72010 refuted. 0 times theorem prover too weak. 144020 trivial. 0 not checked. [2021-11-21 00:45:08,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:45:51,263 INFO L134 CoverageAnalysis]: Checked inductivity of 216030 backedges. 0 proven. 72010 refuted. 0 times theorem prover too weak. 144020 trivial. 0 not checked. [2021-11-21 00:45:51,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2096906903] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:45:51,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [643080462] [2021-11-21 00:45:51,267 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 00:45:51,267 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:45:51,268 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:45:51,268 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:45:51,268 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:45:53,293 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:45:53,311 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:45:54,487 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:45:54,487 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:45:54,488 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [193, 193, 193] total 385 [2021-11-21 00:45:54,488 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858300014] [2021-11-21 00:45:54,488 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:45:54,494 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 385 states [2021-11-21 00:45:54,494 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:45:54,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 385 interpolants. [2021-11-21 00:45:54,532 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73948, Invalid=80108, Unknown=0, NotChecked=0, Total=154056 [2021-11-21 00:45:54,536 INFO L87 Difference]: Start difference. First operand 767 states and 1146 transitions. Second operand has 385 states, 385 states have (on average 2.0) internal successors, (770), 385 states have internal predecessors, (770), 381 states have call successors, (762), 1 states have call predecessors, (762), 1 states have return successors, (762), 381 states have call predecessors, (762), 381 states have call successors, (762) [2021-11-21 00:46:03,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:46:03,110 INFO L93 Difference]: Finished difference Result 1538 states and 2492 transitions. [2021-11-21 00:46:03,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 384 states. [2021-11-21 00:46:03,113 INFO L78 Accepts]: Start accepts. Automaton has has 385 states, 385 states have (on average 2.0) internal successors, (770), 385 states have internal predecessors, (770), 381 states have call successors, (762), 1 states have call predecessors, (762), 1 states have return successors, (762), 381 states have call predecessors, (762), 381 states have call successors, (762) Word has length 1524 [2021-11-21 00:46:03,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:46:03,131 INFO L225 Difference]: With dead ends: 1538 [2021-11-21 00:46:03,131 INFO L226 Difference]: Without dead ends: 1535 [2021-11-21 00:46:03,145 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4763 GetRequests, 4372 SyntacticMatches, 0 SemanticMatches, 391 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5359 ImplicationChecksByTransitivity, 52.9s TimeCoverageRelationStatistics Valid=73948, Invalid=80108, Unknown=0, NotChecked=0, Total=154056 [2021-11-21 00:46:03,146 INFO L933 BasicCegarLoop]: 768 mSDtfsCounter, 573 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 5096 mSolverCounterSat, 1341 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 577 SdHoareTripleChecker+Valid, 800 SdHoareTripleChecker+Invalid, 6437 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1341 IncrementalHoareTripleChecker+Valid, 5096 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2021-11-21 00:46:03,146 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [577 Valid, 800 Invalid, 6437 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1341 Valid, 5096 Invalid, 0 Unknown, 0 Unchecked, 3.8s Time] [2021-11-21 00:46:03,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1535 states. [2021-11-21 00:46:03,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1535 to 1535. [2021-11-21 00:46:03,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1535 states, 769 states have (on average 1.0013003901170352) internal successors, (770), 769 states have internal predecessors, (770), 764 states have call successors, (764), 1 states have call predecessors, (764), 1 states have return successors, (764), 764 states have call predecessors, (764), 764 states have call successors, (764) [2021-11-21 00:46:03,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1535 states to 1535 states and 2298 transitions. [2021-11-21 00:46:03,254 INFO L78 Accepts]: Start accepts. Automaton has 1535 states and 2298 transitions. Word has length 1524 [2021-11-21 00:46:03,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:46:03,259 INFO L470 AbstractCegarLoop]: Abstraction has 1535 states and 2298 transitions. [2021-11-21 00:46:03,262 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 385 states, 385 states have (on average 2.0) internal successors, (770), 385 states have internal predecessors, (770), 381 states have call successors, (762), 1 states have call predecessors, (762), 1 states have return successors, (762), 381 states have call predecessors, (762), 381 states have call successors, (762) [2021-11-21 00:46:03,262 INFO L276 IsEmpty]: Start isEmpty. Operand 1535 states and 2298 transitions. [2021-11-21 00:46:03,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3061 [2021-11-21 00:46:03,343 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:46:03,344 INFO L514 BasicCegarLoop]: trace histogram [764, 382, 382, 382, 382, 382, 382, 1, 1, 1, 1] [2021-11-21 00:46:03,372 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-21 00:46:03,544 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:46:03,545 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:46:03,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:46:03,546 INFO L85 PathProgramCache]: Analyzing trace with hash 1454775378, now seen corresponding path program 8 times [2021-11-21 00:46:03,546 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:46:03,546 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [594108071] [2021-11-21 00:46:03,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:46:03,546 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:46:05,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:47:02,178 INFO L134 CoverageAnalysis]: Checked inductivity of 874398 backedges. 0 proven. 291466 refuted. 0 times theorem prover too weak. 582932 trivial. 0 not checked. [2021-11-21 00:47:02,179 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:47:02,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [594108071] [2021-11-21 00:47:02,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [594108071] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:47:02,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1973630271] [2021-11-21 00:47:02,180 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:47:02,180 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:47:02,180 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:47:02,187 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:47:02,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 00:47:35,327 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 511 check-sat command(s) [2021-11-21 00:47:35,328 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:47:35,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 9967 conjuncts, 384 conjunts are in the unsatisfiable core [2021-11-21 00:47:35,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:47:42,560 INFO L134 CoverageAnalysis]: Checked inductivity of 874398 backedges. 0 proven. 291466 refuted. 0 times theorem prover too weak. 582932 trivial. 0 not checked. [2021-11-21 00:47:42,560 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:50:38,791 INFO L134 CoverageAnalysis]: Checked inductivity of 874398 backedges. 0 proven. 291466 refuted. 0 times theorem prover too weak. 582932 trivial. 0 not checked. [2021-11-21 00:50:38,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1973630271] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:50:38,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [839941233] [2021-11-21 00:50:38,795 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 00:50:38,795 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:50:38,796 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:50:38,796 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:50:38,796 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:50:40,955 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 00:50:40,986 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:50:43,203 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:50:43,204 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:50:43,206 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [385, 385, 385] total 769 [2021-11-21 00:50:43,209 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1128795403] [2021-11-21 00:50:43,210 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:50:43,217 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 769 states [2021-11-21 00:50:43,217 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:50:43,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 769 interpolants. [2021-11-21 00:50:43,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=295324, Invalid=307628, Unknown=0, NotChecked=0, Total=602952 [2021-11-21 00:50:43,448 INFO L87 Difference]: Start difference. First operand 1535 states and 2298 transitions. Second operand has 769 states, 769 states have (on average 2.0) internal successors, (1538), 769 states have internal predecessors, (1538), 765 states have call successors, (1530), 1 states have call predecessors, (1530), 1 states have return successors, (1530), 765 states have call predecessors, (1530), 765 states have call successors, (1530) [2021-11-21 00:51:18,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:51:18,039 INFO L93 Difference]: Finished difference Result 3074 states and 4988 transitions. [2021-11-21 00:51:18,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 768 states. [2021-11-21 00:51:18,043 INFO L78 Accepts]: Start accepts. Automaton has has 769 states, 769 states have (on average 2.0) internal successors, (1538), 769 states have internal predecessors, (1538), 765 states have call successors, (1530), 1 states have call predecessors, (1530), 1 states have return successors, (1530), 765 states have call predecessors, (1530), 765 states have call successors, (1530) Word has length 3060 [2021-11-21 00:51:18,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:51:18,077 INFO L225 Difference]: With dead ends: 3074 [2021-11-21 00:51:18,077 INFO L226 Difference]: Without dead ends: 3071 [2021-11-21 00:51:18,139 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9563 GetRequests, 8788 SyntacticMatches, 0 SemanticMatches, 775 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10735 ImplicationChecksByTransitivity, 223.3s TimeCoverageRelationStatistics Valid=295324, Invalid=307628, Unknown=0, NotChecked=0, Total=602952 [2021-11-21 00:51:18,140 INFO L933 BasicCegarLoop]: 1536 mSDtfsCounter, 766 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 11180 mSolverCounterSat, 1919 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 770 SdHoareTripleChecker+Valid, 1568 SdHoareTripleChecker+Invalid, 13099 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1919 IncrementalHoareTripleChecker+Valid, 11180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:51:18,140 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [770 Valid, 1568 Invalid, 13099 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1919 Valid, 11180 Invalid, 0 Unknown, 0 Unchecked, 7.6s Time] [2021-11-21 00:51:18,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3071 states. [2021-11-21 00:51:18,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3071 to 3071. [2021-11-21 00:51:18,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3071 states, 1537 states have (on average 1.0006506180871828) internal successors, (1538), 1537 states have internal predecessors, (1538), 1532 states have call successors, (1532), 1 states have call predecessors, (1532), 1 states have return successors, (1532), 1532 states have call predecessors, (1532), 1532 states have call successors, (1532) [2021-11-21 00:51:18,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3071 states to 3071 states and 4602 transitions. [2021-11-21 00:51:18,379 INFO L78 Accepts]: Start accepts. Automaton has 3071 states and 4602 transitions. Word has length 3060 [2021-11-21 00:51:18,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:51:18,386 INFO L470 AbstractCegarLoop]: Abstraction has 3071 states and 4602 transitions. [2021-11-21 00:51:18,389 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 769 states, 769 states have (on average 2.0) internal successors, (1538), 769 states have internal predecessors, (1538), 765 states have call successors, (1530), 1 states have call predecessors, (1530), 1 states have return successors, (1530), 765 states have call predecessors, (1530), 765 states have call successors, (1530) [2021-11-21 00:51:18,390 INFO L276 IsEmpty]: Start isEmpty. Operand 3071 states and 4602 transitions. [2021-11-21 00:51:18,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6133 [2021-11-21 00:51:18,738 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:51:18,740 INFO L514 BasicCegarLoop]: trace histogram [1532, 766, 766, 766, 766, 766, 766, 1, 1, 1, 1] [2021-11-21 00:51:18,787 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 00:51:18,942 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0bab464-c5f1-4255-a0b2-adfaba4271f7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:51:18,942 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:51:18,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:51:18,944 INFO L85 PathProgramCache]: Analyzing trace with hash -662729902, now seen corresponding path program 9 times [2021-11-21 00:51:18,944 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:51:18,944 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2050369487] [2021-11-21 00:51:18,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:51:18,945 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:51:24,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat