./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/openssl-simplified/s3_clnt_2.cil-2.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_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/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_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/openssl-simplified/s3_clnt_2.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/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_05b15dbb-07ee-46e6-90c8-688d7770d2cc/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 e8a8eb6c750c607e2f549ecc5582c4aebf9571fc15330f2a7e0973b7c96cc082 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:42:44,232 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:42:44,235 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:42:44,292 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:42:44,293 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:42:44,298 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:42:44,300 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:42:44,305 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:42:44,308 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:42:44,315 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:42:44,316 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:42:44,318 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:42:44,319 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:42:44,322 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:42:44,325 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:42:44,330 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:42:44,332 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:42:44,333 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:42:44,336 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:42:44,345 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:42:44,347 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:42:44,348 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:42:44,352 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:42:44,353 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:42:44,363 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:42:44,363 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:42:44,364 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:42:44,366 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:42:44,367 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:42:44,368 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:42:44,369 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:42:44,370 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:42:44,372 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:42:44,373 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:42:44,375 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:42:44,375 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:42:44,376 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:42:44,376 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:42:44,377 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:42:44,378 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:42:44,378 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:42:44,379 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 00:42:44,414 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:42:44,414 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:42:44,415 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:42:44,415 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:42:44,416 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:42:44,416 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:42:44,416 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:42:44,416 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:42:44,416 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:42:44,417 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:42:44,417 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:42:44,417 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:42:44,417 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:42:44,417 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:42:44,418 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:42:44,418 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:42:44,418 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:42:44,418 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:42:44,419 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:42:44,419 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:42:44,419 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:42:44,420 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:42:44,420 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:42:44,420 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 00:42:44,420 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:42:44,420 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 00:42:44,421 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:42:44,421 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 00:42:44,421 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:42:44,421 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 00:42:44,421 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:42:44,422 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:42:44,422 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:42:44,422 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:42:44,422 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:42:44,422 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 00:42:44,423 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:42:44,423 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:42:44,423 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 00:42:44,423 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:42:44,423 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:42:44,423 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_05b15dbb-07ee-46e6-90c8-688d7770d2cc/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e8a8eb6c750c607e2f549ecc5582c4aebf9571fc15330f2a7e0973b7c96cc082 [2021-11-21 00:42:44,752 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:42:44,785 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:42:44,788 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:42:44,789 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:42:44,790 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:42:44,792 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/openssl-simplified/s3_clnt_2.cil-2.c [2021-11-21 00:42:44,869 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/data/10433c328/874c520397944db3aa0be0fd3f78d008/FLAGddb392f9f [2021-11-21 00:42:45,472 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:42:45,472 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/sv-benchmarks/c/openssl-simplified/s3_clnt_2.cil-2.c [2021-11-21 00:42:45,484 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/data/10433c328/874c520397944db3aa0be0fd3f78d008/FLAGddb392f9f [2021-11-21 00:42:45,777 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/data/10433c328/874c520397944db3aa0be0fd3f78d008 [2021-11-21 00:42:45,780 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:42:45,782 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:42:45,784 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:42:45,785 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:42:45,789 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:42:45,790 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:42:45" (1/1) ... [2021-11-21 00:42:45,791 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7650e776 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:45, skipping insertion in model container [2021-11-21 00:42:45,792 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:42:45" (1/1) ... [2021-11-21 00:42:45,812 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:42:45,894 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:42:46,238 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_05b15dbb-07ee-46e6-90c8-688d7770d2cc/sv-benchmarks/c/openssl-simplified/s3_clnt_2.cil-2.c[35827,35840] [2021-11-21 00:42:46,264 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:42:46,274 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:42:46,385 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_05b15dbb-07ee-46e6-90c8-688d7770d2cc/sv-benchmarks/c/openssl-simplified/s3_clnt_2.cil-2.c[35827,35840] [2021-11-21 00:42:46,391 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:42:46,408 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:42:46,409 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:46 WrapperNode [2021-11-21 00:42:46,410 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:42:46,411 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:42:46,411 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:42:46,412 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:42:46,420 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:46" (1/1) ... [2021-11-21 00:42:46,448 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:46" (1/1) ... [2021-11-21 00:42:46,512 INFO L137 Inliner]: procedures = 15, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 504 [2021-11-21 00:42:46,514 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:42:46,516 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:42:46,516 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:42:46,516 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:42:46,525 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:46" (1/1) ... [2021-11-21 00:42:46,525 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:46" (1/1) ... [2021-11-21 00:42:46,537 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:46" (1/1) ... [2021-11-21 00:42:46,537 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:46" (1/1) ... [2021-11-21 00:42:46,550 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:46" (1/1) ... [2021-11-21 00:42:46,569 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:46" (1/1) ... [2021-11-21 00:42:46,579 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:46" (1/1) ... [2021-11-21 00:42:46,583 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:42:46,585 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:42:46,585 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:42:46,585 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:42:46,586 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:46" (1/1) ... [2021-11-21 00:42:46,593 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:42:46,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:42:46,621 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:42:46,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:42:46,670 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:42:46,670 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 00:42:46,670 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:42:46,671 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:42:46,788 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:42:46,790 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:42:46,817 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-21 00:42:47,420 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##85: assume !false; [2021-11-21 00:42:47,421 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##84: assume false; [2021-11-21 00:42:47,421 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:42:47,595 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:42:47,597 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-21 00:42:47,601 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:42:47 BoogieIcfgContainer [2021-11-21 00:42:47,601 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:42:47,603 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:42:47,603 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:42:47,607 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:42:47,607 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:42:45" (1/3) ... [2021-11-21 00:42:47,608 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2269f68b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:42:47, skipping insertion in model container [2021-11-21 00:42:47,609 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:46" (2/3) ... [2021-11-21 00:42:47,610 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2269f68b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:42:47, skipping insertion in model container [2021-11-21 00:42:47,615 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:42:47" (3/3) ... [2021-11-21 00:42:47,617 INFO L111 eAbstractionObserver]: Analyzing ICFG s3_clnt_2.cil-2.c [2021-11-21 00:42:47,624 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:42:47,624 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 00:42:47,677 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:42:47,686 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 00:42:47,686 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 00:42:47,703 INFO L276 IsEmpty]: Start isEmpty. Operand has 85 states, 83 states have (on average 1.7590361445783131) internal successors, (146), 84 states have internal predecessors, (146), 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 00:42:47,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-21 00:42:47,709 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:42:47,710 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:42:47,710 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:42:47,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:42:47,720 INFO L85 PathProgramCache]: Analyzing trace with hash 602199862, now seen corresponding path program 1 times [2021-11-21 00:42:47,744 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:42:47,746 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1679917080] [2021-11-21 00:42:47,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:42:47,747 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:42:47,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:42:47,982 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 00:42:47,983 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:42:47,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1679917080] [2021-11-21 00:42:47,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1679917080] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:42:47,984 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:42:47,984 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:42:47,986 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [96006277] [2021-11-21 00:42:47,988 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:42:47,993 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:42:47,994 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:42:48,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:42:48,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:42:48,037 INFO L87 Difference]: Start difference. First operand has 85 states, 83 states have (on average 1.7590361445783131) internal successors, (146), 84 states have internal predecessors, (146), 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) Second operand has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 2 states have internal predecessors, (19), 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 00:42:48,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:42:48,298 INFO L93 Difference]: Finished difference Result 171 states and 295 transitions. [2021-11-21 00:42:48,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:42:48,301 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 2 states have internal predecessors, (19), 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 19 [2021-11-21 00:42:48,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:42:48,312 INFO L225 Difference]: With dead ends: 171 [2021-11-21 00:42:48,313 INFO L226 Difference]: Without dead ends: 84 [2021-11-21 00:42:48,316 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 00:42:48,322 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 0 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:42:48,323 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 180 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:42:48,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-21 00:42:48,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2021-11-21 00:42:48,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 83 states have (on average 1.4578313253012047) internal successors, (121), 83 states have internal predecessors, (121), 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 00:42:48,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 121 transitions. [2021-11-21 00:42:48,380 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 121 transitions. Word has length 19 [2021-11-21 00:42:48,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:42:48,381 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 121 transitions. [2021-11-21 00:42:48,383 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 2 states have internal predecessors, (19), 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 00:42:48,383 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 121 transitions. [2021-11-21 00:42:48,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-21 00:42:48,385 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:42:48,385 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:42:48,385 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:42:48,386 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:42:48,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:42:48,389 INFO L85 PathProgramCache]: Analyzing trace with hash -2014871544, now seen corresponding path program 1 times [2021-11-21 00:42:48,389 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:42:48,390 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1537626732] [2021-11-21 00:42:48,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:42:48,391 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:42:48,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:42:48,520 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:42:48,520 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:42:48,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1537626732] [2021-11-21 00:42:48,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1537626732] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:42:48,521 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:42:48,521 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:42:48,522 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85523864] [2021-11-21 00:42:48,522 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:42:48,523 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:42:48,524 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:42:48,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:42:48,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:42:48,525 INFO L87 Difference]: Start difference. First operand 84 states and 121 transitions. Second operand has 3 states, 3 states have (on average 9.333333333333334) internal successors, (28), 3 states have internal predecessors, (28), 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 00:42:48,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:42:48,676 INFO L93 Difference]: Finished difference Result 180 states and 263 transitions. [2021-11-21 00:42:48,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:42:48,677 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 9.333333333333334) internal successors, (28), 3 states have internal predecessors, (28), 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 28 [2021-11-21 00:42:48,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:42:48,679 INFO L225 Difference]: With dead ends: 180 [2021-11-21 00:42:48,679 INFO L226 Difference]: Without dead ends: 99 [2021-11-21 00:42:48,680 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:42:48,682 INFO L933 BasicCegarLoop]: 96 mSDtfsCounter, 8 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:42:48,682 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 130 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:42:48,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-11-21 00:42:48,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 97. [2021-11-21 00:42:48,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 96 states have (on average 1.4270833333333333) internal successors, (137), 96 states have internal predecessors, (137), 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 00:42:48,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 137 transitions. [2021-11-21 00:42:48,694 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 137 transitions. Word has length 28 [2021-11-21 00:42:48,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:42:48,694 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 137 transitions. [2021-11-21 00:42:48,695 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 9.333333333333334) internal successors, (28), 3 states have internal predecessors, (28), 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 00:42:48,695 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 137 transitions. [2021-11-21 00:42:48,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-21 00:42:48,696 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:42:48,697 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:42:48,697 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 00:42:48,697 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:42:48,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:42:48,698 INFO L85 PathProgramCache]: Analyzing trace with hash -1649210470, now seen corresponding path program 1 times [2021-11-21 00:42:48,698 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:42:48,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [104229428] [2021-11-21 00:42:48,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:42:48,699 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:42:48,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:42:48,779 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 00:42:48,779 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:42:48,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [104229428] [2021-11-21 00:42:48,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [104229428] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:42:48,782 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:42:48,782 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:42:48,782 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072662683] [2021-11-21 00:42:48,782 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:42:48,783 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:42:48,784 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:42:48,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:42:48,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:42:48,785 INFO L87 Difference]: Start difference. First operand 97 states and 137 transitions. Second operand has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 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 00:42:48,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:42:48,940 INFO L93 Difference]: Finished difference Result 208 states and 299 transitions. [2021-11-21 00:42:48,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:42:48,941 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 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 39 [2021-11-21 00:42:48,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:42:48,947 INFO L225 Difference]: With dead ends: 208 [2021-11-21 00:42:48,947 INFO L226 Difference]: Without dead ends: 114 [2021-11-21 00:42:48,950 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:42:48,957 INFO L933 BasicCegarLoop]: 107 mSDtfsCounter, 8 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:42:48,958 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 141 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:42:48,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-21 00:42:48,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 112. [2021-11-21 00:42:48,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 111 states have (on average 1.3963963963963963) internal successors, (155), 111 states have internal predecessors, (155), 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 00:42:48,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 155 transitions. [2021-11-21 00:42:48,978 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 155 transitions. Word has length 39 [2021-11-21 00:42:48,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:42:48,979 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 155 transitions. [2021-11-21 00:42:48,979 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 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 00:42:48,979 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 155 transitions. [2021-11-21 00:42:48,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-21 00:42:48,981 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:42:48,981 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:42:48,981 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-21 00:42:48,982 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:42:48,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:42:48,982 INFO L85 PathProgramCache]: Analyzing trace with hash 503424708, now seen corresponding path program 1 times [2021-11-21 00:42:48,982 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:42:48,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [406023501] [2021-11-21 00:42:48,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:42:48,983 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:42:49,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:42:49,134 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 00:42:49,134 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:42:49,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [406023501] [2021-11-21 00:42:49,135 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [406023501] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:42:49,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1557676232] [2021-11-21 00:42:49,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:42:49,135 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:42:49,136 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:42:49,139 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:42:49,159 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:42:49,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:42:49,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:42:49,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:42:49,581 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-21 00:42:49,581 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:42:49,581 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1557676232] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:42:49,581 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:42:49,582 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 7 [2021-11-21 00:42:49,583 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1754019105] [2021-11-21 00:42:49,583 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:42:49,583 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:42:49,586 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:42:49,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:42:49,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:42:49,588 INFO L87 Difference]: Start difference. First operand 112 states and 155 transitions. Second operand has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 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 00:42:49,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:42:49,820 INFO L93 Difference]: Finished difference Result 264 states and 384 transitions. [2021-11-21 00:42:49,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:42:49,820 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 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 52 [2021-11-21 00:42:49,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:42:49,823 INFO L225 Difference]: With dead ends: 264 [2021-11-21 00:42:49,823 INFO L226 Difference]: Without dead ends: 155 [2021-11-21 00:42:49,823 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:42:49,832 INFO L933 BasicCegarLoop]: 86 mSDtfsCounter, 33 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:42:49,833 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 162 Invalid, 256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 225 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:42:49,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-11-21 00:42:49,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 149. [2021-11-21 00:42:49,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 148 states have (on average 1.3243243243243243) internal successors, (196), 148 states have internal predecessors, (196), 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 00:42:49,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 196 transitions. [2021-11-21 00:42:49,855 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 196 transitions. Word has length 52 [2021-11-21 00:42:49,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:42:49,855 INFO L470 AbstractCegarLoop]: Abstraction has 149 states and 196 transitions. [2021-11-21 00:42:49,856 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 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 00:42:49,856 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 196 transitions. [2021-11-21 00:42:49,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-21 00:42:49,863 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:42:49,863 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:42:49,906 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:42:50,091 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:42:50,092 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:42:50,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:42:50,092 INFO L85 PathProgramCache]: Analyzing trace with hash 507843523, now seen corresponding path program 1 times [2021-11-21 00:42:50,093 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:42:50,093 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1089493503] [2021-11-21 00:42:50,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:42:50,093 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:42:50,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:42:50,189 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-21 00:42:50,189 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:42:50,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1089493503] [2021-11-21 00:42:50,189 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1089493503] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:42:50,189 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:42:50,190 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:42:50,190 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890627516] [2021-11-21 00:42:50,190 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:42:50,195 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:42:50,195 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:42:50,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:42:50,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:42:50,196 INFO L87 Difference]: Start difference. First operand 149 states and 196 transitions. Second operand has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 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 00:42:50,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:42:50,384 INFO L93 Difference]: Finished difference Result 316 states and 425 transitions. [2021-11-21 00:42:50,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:42:50,385 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 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 68 [2021-11-21 00:42:50,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:42:50,387 INFO L225 Difference]: With dead ends: 316 [2021-11-21 00:42:50,387 INFO L226 Difference]: Without dead ends: 170 [2021-11-21 00:42:50,388 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:42:50,388 INFO L933 BasicCegarLoop]: 109 mSDtfsCounter, 8 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:42:50,389 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 143 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:42:50,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-11-21 00:42:50,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 168. [2021-11-21 00:42:50,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 167 states have (on average 1.3053892215568863) internal successors, (218), 167 states have internal predecessors, (218), 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 00:42:50,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 218 transitions. [2021-11-21 00:42:50,398 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 218 transitions. Word has length 68 [2021-11-21 00:42:50,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:42:50,399 INFO L470 AbstractCegarLoop]: Abstraction has 168 states and 218 transitions. [2021-11-21 00:42:50,399 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 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 00:42:50,415 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 218 transitions. [2021-11-21 00:42:50,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-21 00:42:50,417 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:42:50,417 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:42:50,417 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-21 00:42:50,417 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:42:50,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:42:50,418 INFO L85 PathProgramCache]: Analyzing trace with hash 1573808801, now seen corresponding path program 1 times [2021-11-21 00:42:50,418 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:42:50,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1736308749] [2021-11-21 00:42:50,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:42:50,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:42:50,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:42:50,528 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-21 00:42:50,528 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:42:50,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1736308749] [2021-11-21 00:42:50,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1736308749] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:42:50,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [135164134] [2021-11-21 00:42:50,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:42:50,529 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:42:50,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:42:50,539 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:42:50,540 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:42:50,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:42:50,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 00:42:50,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:42:50,860 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-21 00:42:50,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:42:51,208 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2021-11-21 00:42:51,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [135164134] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:42:51,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1566349197] [2021-11-21 00:42:51,239 INFO L159 IcfgInterpreter]: Started Sifa with 37 locations of interest [2021-11-21 00:42:51,240 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:42:51,246 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:42:51,252 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:42:51,253 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:45:23,893 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:45:34,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1566349197] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:45:34,684 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:45:34,684 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [4, 4, 3] total 33 [2021-11-21 00:45:34,685 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388082309] [2021-11-21 00:45:34,685 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:45:34,686 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-21 00:45:34,686 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:45:34,686 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-21 00:45:34,687 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=910, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 00:45:34,688 INFO L87 Difference]: Start difference. First operand 168 states and 218 transitions. Second operand has 29 states, 29 states have (on average 1.4137931034482758) internal successors, (41), 28 states have internal predecessors, (41), 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 00:45:53,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:45:53,635 INFO L93 Difference]: Finished difference Result 527 states and 708 transitions. [2021-11-21 00:45:53,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-21 00:45:53,636 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.4137931034482758) internal successors, (41), 28 states have internal predecessors, (41), 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 86 [2021-11-21 00:45:53,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:45:53,639 INFO L225 Difference]: With dead ends: 527 [2021-11-21 00:45:53,640 INFO L226 Difference]: Without dead ends: 360 [2021-11-21 00:45:53,642 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 228 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 538 ImplicationChecksByTransitivity, 24.5s TimeCoverageRelationStatistics Valid=579, Invalid=2283, Unknown=0, NotChecked=0, Total=2862 [2021-11-21 00:45:53,643 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 370 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 2819 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 370 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 2921 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 2819 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:45:53,644 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [370 Valid, 120 Invalid, 2921 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 2819 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2021-11-21 00:45:53,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2021-11-21 00:45:53,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 299. [2021-11-21 00:45:53,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 299 states, 298 states have (on average 1.2718120805369129) internal successors, (379), 298 states have internal predecessors, (379), 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 00:45:53,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 379 transitions. [2021-11-21 00:45:53,694 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 379 transitions. Word has length 86 [2021-11-21 00:45:53,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:45:53,695 INFO L470 AbstractCegarLoop]: Abstraction has 299 states and 379 transitions. [2021-11-21 00:45:53,695 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.4137931034482758) internal successors, (41), 28 states have internal predecessors, (41), 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 00:45:53,696 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 379 transitions. [2021-11-21 00:45:53,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-21 00:45:53,700 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:45:53,701 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:45:53,741 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-21 00:45:53,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:45:53,916 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:45:53,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:45:53,916 INFO L85 PathProgramCache]: Analyzing trace with hash -1936763887, now seen corresponding path program 1 times [2021-11-21 00:45:53,916 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:45:53,917 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [235702000] [2021-11-21 00:45:53,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:45:53,917 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:45:53,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:45:54,020 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 118 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 00:45:54,021 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:45:54,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [235702000] [2021-11-21 00:45:54,021 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [235702000] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:45:54,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1080040819] [2021-11-21 00:45:54,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:45:54,022 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:45:54,022 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:45:54,023 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:45:54,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:45:54,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:45:54,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 00:45:54,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:45:54,326 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 118 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 00:45:54,326 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:45:54,586 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2021-11-21 00:45:54,586 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1080040819] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:45:54,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [170173138] [2021-11-21 00:45:54,590 INFO L159 IcfgInterpreter]: Started Sifa with 38 locations of interest [2021-11-21 00:45:54,590 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:45:54,591 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:45:54,591 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:45:54,591 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:48:41,091 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:48:52,394 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:48:52,395 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:48:52,395 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 3] total 8 [2021-11-21 00:48:52,395 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1059671845] [2021-11-21 00:48:52,396 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:48:52,397 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 00:48:52,397 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:48:52,398 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 00:48:52,399 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=1147, Unknown=0, NotChecked=0, Total=1332 [2021-11-21 00:48:52,399 INFO L87 Difference]: Start difference. First operand 299 states and 379 transitions. Second operand has 9 states, 9 states have (on average 15.0) internal successors, (135), 8 states have internal predecessors, (135), 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 00:48:52,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:48:52,628 INFO L93 Difference]: Finished difference Result 808 states and 1042 transitions. [2021-11-21 00:48:52,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:48:52,629 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 15.0) internal successors, (135), 8 states have internal predecessors, (135), 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 87 [2021-11-21 00:48:52,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:48:52,639 INFO L225 Difference]: With dead ends: 808 [2021-11-21 00:48:52,639 INFO L226 Difference]: Without dead ends: 806 [2021-11-21 00:48:52,640 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 229 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 291 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=185, Invalid=1147, Unknown=0, NotChecked=0, Total=1332 [2021-11-21 00:48:52,642 INFO L933 BasicCegarLoop]: 255 mSDtfsCounter, 428 mSDsluCounter, 924 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 428 SdHoareTripleChecker+Valid, 1071 SdHoareTripleChecker+Invalid, 214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:48:52,642 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [428 Valid, 1071 Invalid, 214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:48:52,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 806 states. [2021-11-21 00:48:52,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 806 to 586. [2021-11-21 00:48:52,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 586 states, 585 states have (on average 1.2974358974358975) internal successors, (759), 585 states have internal predecessors, (759), 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 00:48:52,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 586 states to 586 states and 759 transitions. [2021-11-21 00:48:52,707 INFO L78 Accepts]: Start accepts. Automaton has 586 states and 759 transitions. Word has length 87 [2021-11-21 00:48:52,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:48:52,709 INFO L470 AbstractCegarLoop]: Abstraction has 586 states and 759 transitions. [2021-11-21 00:48:52,709 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 15.0) internal successors, (135), 8 states have internal predecessors, (135), 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 00:48:52,710 INFO L276 IsEmpty]: Start isEmpty. Operand 586 states and 759 transitions. [2021-11-21 00:48:52,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-21 00:48:52,719 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:48:52,720 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 9, 7, 7, 5, 5, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:48:52,745 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:48:52,920 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:48:52,920 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:48:52,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:48:52,921 INFO L85 PathProgramCache]: Analyzing trace with hash 396980586, now seen corresponding path program 1 times [2021-11-21 00:48:52,921 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:48:52,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [655439630] [2021-11-21 00:48:52,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:48:52,922 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:48:52,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:48:53,026 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 276 proven. 0 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-11-21 00:48:53,027 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:48:53,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [655439630] [2021-11-21 00:48:53,027 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [655439630] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:48:53,027 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:48:53,028 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:48:53,028 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1855401027] [2021-11-21 00:48:53,028 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:48:53,029 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:48:53,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:48:53,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:48:53,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:48:53,030 INFO L87 Difference]: Start difference. First operand 586 states and 759 transitions. Second operand has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 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 00:48:53,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:48:53,202 INFO L93 Difference]: Finished difference Result 1170 states and 1590 transitions. [2021-11-21 00:48:53,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:48:53,208 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 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 145 [2021-11-21 00:48:53,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:48:53,215 INFO L225 Difference]: With dead ends: 1170 [2021-11-21 00:48:53,215 INFO L226 Difference]: Without dead ends: 715 [2021-11-21 00:48:53,216 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:48:53,217 INFO L933 BasicCegarLoop]: 96 mSDtfsCounter, 71 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:48:53,218 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 116 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:48:53,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 715 states. [2021-11-21 00:48:53,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 715 to 700. [2021-11-21 00:48:53,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 700 states, 699 states have (on average 1.3476394849785407) internal successors, (942), 699 states have internal predecessors, (942), 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 00:48:53,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 700 states to 700 states and 942 transitions. [2021-11-21 00:48:53,260 INFO L78 Accepts]: Start accepts. Automaton has 700 states and 942 transitions. Word has length 145 [2021-11-21 00:48:53,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:48:53,261 INFO L470 AbstractCegarLoop]: Abstraction has 700 states and 942 transitions. [2021-11-21 00:48:53,261 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 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 00:48:53,262 INFO L276 IsEmpty]: Start isEmpty. Operand 700 states and 942 transitions. [2021-11-21 00:48:53,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2021-11-21 00:48:53,265 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:48:53,265 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 9, 9, 9, 9, 9, 7, 7, 5, 5, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:48:53,266 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-21 00:48:53,267 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:48:53,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:48:53,267 INFO L85 PathProgramCache]: Analyzing trace with hash -1522969626, now seen corresponding path program 2 times [2021-11-21 00:48:53,268 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:48:53,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1265390159] [2021-11-21 00:48:53,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:48:53,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:48:53,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:48:53,358 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 283 proven. 0 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-11-21 00:48:53,358 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:48:53,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1265390159] [2021-11-21 00:48:53,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1265390159] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:48:53,359 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:48:53,359 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:48:53,359 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [531825102] [2021-11-21 00:48:53,360 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:48:53,360 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:48:53,360 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:48:53,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:48:53,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:48:53,362 INFO L87 Difference]: Start difference. First operand 700 states and 942 transitions. Second operand has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 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 00:48:53,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:48:53,543 INFO L93 Difference]: Finished difference Result 1521 states and 2148 transitions. [2021-11-21 00:48:53,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:48:53,544 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 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 154 [2021-11-21 00:48:53,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:48:53,550 INFO L225 Difference]: With dead ends: 1521 [2021-11-21 00:48:53,551 INFO L226 Difference]: Without dead ends: 904 [2021-11-21 00:48:53,552 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:48:53,555 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 62 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:48:53,556 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 117 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:48:53,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 904 states. [2021-11-21 00:48:53,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 904 to 877. [2021-11-21 00:48:53,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 877 states, 876 states have (on average 1.3356164383561644) internal successors, (1170), 876 states have internal predecessors, (1170), 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 00:48:53,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 877 states to 877 states and 1170 transitions. [2021-11-21 00:48:53,603 INFO L78 Accepts]: Start accepts. Automaton has 877 states and 1170 transitions. Word has length 154 [2021-11-21 00:48:53,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:48:53,604 INFO L470 AbstractCegarLoop]: Abstraction has 877 states and 1170 transitions. [2021-11-21 00:48:53,604 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 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 00:48:53,604 INFO L276 IsEmpty]: Start isEmpty. Operand 877 states and 1170 transitions. [2021-11-21 00:48:53,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-11-21 00:48:53,608 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:48:53,608 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 10, 10, 10, 10, 10, 8, 8, 6, 6, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:48:53,608 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-21 00:48:53,609 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:48:53,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:48:53,610 INFO L85 PathProgramCache]: Analyzing trace with hash -1791641803, now seen corresponding path program 1 times [2021-11-21 00:48:53,610 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:48:53,610 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [216764509] [2021-11-21 00:48:53,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:48:53,610 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:48:53,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:48:53,683 INFO L134 CoverageAnalysis]: Checked inductivity of 584 backedges. 354 proven. 0 refuted. 0 times theorem prover too weak. 230 trivial. 0 not checked. [2021-11-21 00:48:53,683 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:48:53,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [216764509] [2021-11-21 00:48:53,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [216764509] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:48:53,684 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:48:53,684 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:48:53,684 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154442220] [2021-11-21 00:48:53,685 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:48:53,685 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:48:53,685 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:48:53,686 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:48:53,686 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:48:53,686 INFO L87 Difference]: Start difference. First operand 877 states and 1170 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 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 00:48:53,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:48:53,857 INFO L93 Difference]: Finished difference Result 1720 states and 2324 transitions. [2021-11-21 00:48:53,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:48:53,858 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 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 174 [2021-11-21 00:48:53,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:48:53,864 INFO L225 Difference]: With dead ends: 1720 [2021-11-21 00:48:53,864 INFO L226 Difference]: Without dead ends: 933 [2021-11-21 00:48:53,866 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:48:53,867 INFO L933 BasicCegarLoop]: 91 mSDtfsCounter, 64 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:48:53,867 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 114 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:48:53,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 933 states. [2021-11-21 00:48:53,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 933 to 908. [2021-11-21 00:48:53,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 908 states, 907 states have (on average 1.318632855567806) internal successors, (1196), 907 states have internal predecessors, (1196), 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 00:48:53,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 908 states to 908 states and 1196 transitions. [2021-11-21 00:48:53,912 INFO L78 Accepts]: Start accepts. Automaton has 908 states and 1196 transitions. Word has length 174 [2021-11-21 00:48:53,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:48:53,912 INFO L470 AbstractCegarLoop]: Abstraction has 908 states and 1196 transitions. [2021-11-21 00:48:53,912 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 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 00:48:53,913 INFO L276 IsEmpty]: Start isEmpty. Operand 908 states and 1196 transitions. [2021-11-21 00:48:53,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2021-11-21 00:48:53,916 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:48:53,917 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 11, 11, 11, 11, 11, 9, 9, 7, 7, 5, 5, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:48:53,917 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-21 00:48:53,917 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:48:53,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:48:53,918 INFO L85 PathProgramCache]: Analyzing trace with hash 846633239, now seen corresponding path program 1 times [2021-11-21 00:48:53,918 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:48:53,918 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1953127756] [2021-11-21 00:48:53,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:48:53,919 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:48:53,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:48:53,970 INFO L134 CoverageAnalysis]: Checked inductivity of 720 backedges. 423 proven. 0 refuted. 0 times theorem prover too weak. 297 trivial. 0 not checked. [2021-11-21 00:48:53,970 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:48:53,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1953127756] [2021-11-21 00:48:53,970 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1953127756] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:48:53,971 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:48:53,971 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:48:53,971 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387483279] [2021-11-21 00:48:53,971 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:48:53,972 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:48:53,972 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:48:53,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:48:53,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:48:53,973 INFO L87 Difference]: Start difference. First operand 908 states and 1196 transitions. Second operand has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 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 00:48:54,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:48:54,122 INFO L93 Difference]: Finished difference Result 1834 states and 2466 transitions. [2021-11-21 00:48:54,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:48:54,123 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 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 195 [2021-11-21 00:48:54,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:48:54,129 INFO L225 Difference]: With dead ends: 1834 [2021-11-21 00:48:54,129 INFO L226 Difference]: Without dead ends: 1018 [2021-11-21 00:48:54,130 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:48:54,131 INFO L933 BasicCegarLoop]: 91 mSDtfsCounter, 66 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:48:54,132 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 112 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:48:54,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1018 states. [2021-11-21 00:48:54,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1018 to 995. [2021-11-21 00:48:54,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 995 states, 994 states have (on average 1.323943661971831) internal successors, (1316), 994 states have internal predecessors, (1316), 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 00:48:54,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 995 states to 995 states and 1316 transitions. [2021-11-21 00:48:54,174 INFO L78 Accepts]: Start accepts. Automaton has 995 states and 1316 transitions. Word has length 195 [2021-11-21 00:48:54,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:48:54,175 INFO L470 AbstractCegarLoop]: Abstraction has 995 states and 1316 transitions. [2021-11-21 00:48:54,175 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 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 00:48:54,175 INFO L276 IsEmpty]: Start isEmpty. Operand 995 states and 1316 transitions. [2021-11-21 00:48:54,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2021-11-21 00:48:54,180 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:48:54,180 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 12, 12, 12, 12, 12, 10, 10, 8, 8, 6, 6, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:48:54,180 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-21 00:48:54,180 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:48:54,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:48:54,181 INFO L85 PathProgramCache]: Analyzing trace with hash -1884486584, now seen corresponding path program 1 times [2021-11-21 00:48:54,181 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:48:54,181 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [288920291] [2021-11-21 00:48:54,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:48:54,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:48:54,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:48:54,242 INFO L134 CoverageAnalysis]: Checked inductivity of 875 backedges. 492 proven. 0 refuted. 0 times theorem prover too weak. 383 trivial. 0 not checked. [2021-11-21 00:48:54,243 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:48:54,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [288920291] [2021-11-21 00:48:54,243 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [288920291] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:48:54,243 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:48:54,243 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:48:54,244 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [946316220] [2021-11-21 00:48:54,244 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:48:54,244 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:48:54,245 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:48:54,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:48:54,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:48:54,245 INFO L87 Difference]: Start difference. First operand 995 states and 1316 transitions. Second operand has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 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 00:48:54,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:48:54,401 INFO L93 Difference]: Finished difference Result 2122 states and 2922 transitions. [2021-11-21 00:48:54,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:48:54,401 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 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 222 [2021-11-21 00:48:54,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:48:54,408 INFO L225 Difference]: With dead ends: 2122 [2021-11-21 00:48:54,409 INFO L226 Difference]: Without dead ends: 1231 [2021-11-21 00:48:54,410 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:48:54,411 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 87 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 117 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:48:54,411 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 90 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 117 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:48:54,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1231 states. [2021-11-21 00:48:54,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1231 to 1193. [2021-11-21 00:48:54,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1193 states, 1192 states have (on average 1.3733221476510067) internal successors, (1637), 1192 states have internal predecessors, (1637), 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 00:48:54,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1193 states to 1193 states and 1637 transitions. [2021-11-21 00:48:54,459 INFO L78 Accepts]: Start accepts. Automaton has 1193 states and 1637 transitions. Word has length 222 [2021-11-21 00:48:54,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:48:54,460 INFO L470 AbstractCegarLoop]: Abstraction has 1193 states and 1637 transitions. [2021-11-21 00:48:54,460 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 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 00:48:54,460 INFO L276 IsEmpty]: Start isEmpty. Operand 1193 states and 1637 transitions. [2021-11-21 00:48:54,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2021-11-21 00:48:54,465 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:48:54,465 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 13, 13, 13, 13, 13, 11, 11, 9, 9, 7, 7, 5, 5, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:48:54,465 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-21 00:48:54,466 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:48:54,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:48:54,466 INFO L85 PathProgramCache]: Analyzing trace with hash 20400504, now seen corresponding path program 1 times [2021-11-21 00:48:54,466 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:48:54,466 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1545282129] [2021-11-21 00:48:54,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:48:54,467 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:48:54,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:48:54,536 INFO L134 CoverageAnalysis]: Checked inductivity of 1055 backedges. 561 proven. 0 refuted. 0 times theorem prover too weak. 494 trivial. 0 not checked. [2021-11-21 00:48:54,536 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:48:54,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1545282129] [2021-11-21 00:48:54,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1545282129] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:48:54,537 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:48:54,537 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:48:54,537 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010267725] [2021-11-21 00:48:54,537 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:48:54,538 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:48:54,538 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:48:54,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:48:54,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:48:54,539 INFO L87 Difference]: Start difference. First operand 1193 states and 1637 transitions. Second operand has 3 states, 3 states have (on average 36.0) internal successors, (108), 3 states have internal predecessors, (108), 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 00:48:54,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:48:54,696 INFO L93 Difference]: Finished difference Result 2290 states and 3165 transitions. [2021-11-21 00:48:54,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:48:54,697 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.0) internal successors, (108), 3 states have internal predecessors, (108), 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 255 [2021-11-21 00:48:54,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:48:54,704 INFO L225 Difference]: With dead ends: 2290 [2021-11-21 00:48:54,704 INFO L226 Difference]: Without dead ends: 1207 [2021-11-21 00:48:54,705 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:48:54,706 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 90 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:48:54,706 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 85 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:48:54,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1207 states. [2021-11-21 00:48:54,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1207 to 1184. [2021-11-21 00:48:54,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1184 states, 1183 states have (on average 1.3609467455621302) internal successors, (1610), 1183 states have internal predecessors, (1610), 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 00:48:54,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1184 states to 1184 states and 1610 transitions. [2021-11-21 00:48:54,754 INFO L78 Accepts]: Start accepts. Automaton has 1184 states and 1610 transitions. Word has length 255 [2021-11-21 00:48:54,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:48:54,754 INFO L470 AbstractCegarLoop]: Abstraction has 1184 states and 1610 transitions. [2021-11-21 00:48:54,755 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.0) internal successors, (108), 3 states have internal predecessors, (108), 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 00:48:54,755 INFO L276 IsEmpty]: Start isEmpty. Operand 1184 states and 1610 transitions. [2021-11-21 00:48:54,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 280 [2021-11-21 00:48:54,760 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:48:54,760 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 14, 14, 12, 12, 10, 10, 8, 8, 6, 6, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:48:54,760 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-21 00:48:54,761 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:48:54,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:48:54,761 INFO L85 PathProgramCache]: Analyzing trace with hash 351525961, now seen corresponding path program 1 times [2021-11-21 00:48:54,761 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:48:54,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [567778179] [2021-11-21 00:48:54,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:48:54,762 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:48:54,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:48:54,868 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 772 proven. 63 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2021-11-21 00:48:54,869 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:48:54,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [567778179] [2021-11-21 00:48:54,869 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [567778179] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:48:54,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [301665504] [2021-11-21 00:48:54,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:48:54,870 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:48:54,870 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:48:54,871 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:48:54,899 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05b15dbb-07ee-46e6-90c8-688d7770d2cc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:48:55,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:48:55,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 551 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:48:55,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:48:55,729 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 644 proven. 1 refuted. 0 times theorem prover too weak. 556 trivial. 0 not checked. [2021-11-21 00:48:55,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:48:56,534 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 644 proven. 1 refuted. 0 times theorem prover too weak. 556 trivial. 0 not checked. [2021-11-21 00:48:56,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [301665504] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:48:56,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [325926660] [2021-11-21 00:48:56,539 INFO L159 IcfgInterpreter]: Started Sifa with 63 locations of interest [2021-11-21 00:48:56,539 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:48:56,540 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:48:56,540 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:48:56,540 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs