./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem03_label48.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_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/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_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem03_label48.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/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_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/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 3f14d4f9bc9aeaf37fb25f1f86f7bc3a3a5a6ca0e3e96922bca4446f4d37ab9f --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:58:54,270 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:58:54,273 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:58:54,327 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:58:54,327 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:58:54,331 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:58:54,333 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:58:54,337 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:58:54,339 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:58:54,345 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:58:54,346 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:58:54,348 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:58:54,348 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:58:54,351 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:58:54,353 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:58:54,360 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:58:54,362 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:58:54,363 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:58:54,365 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:58:54,372 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:58:54,374 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:58:54,376 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:58:54,379 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:58:54,380 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:58:54,388 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:58:54,389 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:58:54,389 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:58:54,391 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:58:54,392 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:58:54,393 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:58:54,394 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:58:54,394 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:58:54,396 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:58:54,397 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:58:54,399 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:58:54,399 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:58:54,400 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:58:54,400 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:58:54,400 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:58:54,401 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:58:54,402 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:58:54,403 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:58:54,443 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:58:54,443 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:58:54,444 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:58:54,444 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:58:54,445 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:58:54,451 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:58:54,451 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:58:54,452 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:58:54,452 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:58:54,452 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:58:54,453 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:58:54,453 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:58:54,454 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:58:54,454 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:58:54,454 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:58:54,454 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:58:54,455 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:58:54,455 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:58:54,456 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:58:54,456 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:58:54,456 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:58:54,456 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:58:54,456 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:58:54,457 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:58:54,457 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:58:54,457 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:58:54,459 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:58:54,459 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:58:54,459 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:58:54,459 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:58:54,460 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:58:54,460 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:58:54,460 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:58:54,461 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:58:54,461 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:58:54,461 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:58:54,461 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:58:54,461 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:58:54,462 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:58:54,462 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:58:54,462 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:58:54,462 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_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 3f14d4f9bc9aeaf37fb25f1f86f7bc3a3a5a6ca0e3e96922bca4446f4d37ab9f [2021-11-21 01:58:54,715 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:58:54,737 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:58:54,740 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:58:54,741 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:58:54,742 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:58:54,743 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/eca-rers2012/Problem03_label48.c [2021-11-21 01:58:54,841 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/data/d19887033/a5c1ffdb7d134d7989b3f155ab9ff936/FLAGd3579d200 [2021-11-21 01:58:55,491 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:58:55,491 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/sv-benchmarks/c/eca-rers2012/Problem03_label48.c [2021-11-21 01:58:55,516 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/data/d19887033/a5c1ffdb7d134d7989b3f155ab9ff936/FLAGd3579d200 [2021-11-21 01:58:55,644 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/data/d19887033/a5c1ffdb7d134d7989b3f155ab9ff936 [2021-11-21 01:58:55,647 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:58:55,648 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:58:55,663 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:58:55,663 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:58:55,666 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:58:55,667 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:58:55" (1/1) ... [2021-11-21 01:58:55,668 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6a407ca9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:55, skipping insertion in model container [2021-11-21 01:58:55,668 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:58:55" (1/1) ... [2021-11-21 01:58:55,676 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:58:55,759 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:58:56,424 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_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/sv-benchmarks/c/eca-rers2012/Problem03_label48.c[58935,58948] [2021-11-21 01:58:56,453 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:58:56,462 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:58:56,667 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_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/sv-benchmarks/c/eca-rers2012/Problem03_label48.c[58935,58948] [2021-11-21 01:58:56,678 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:58:56,735 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:58:56,735 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:56 WrapperNode [2021-11-21 01:58:56,735 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:58:56,736 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:58:56,737 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:58:56,737 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:58:56,745 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:56" (1/1) ... [2021-11-21 01:58:56,816 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:56" (1/1) ... [2021-11-21 01:58:56,925 INFO L137 Inliner]: procedures = 14, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 1771 [2021-11-21 01:58:56,926 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:58:56,926 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:58:56,927 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:58:56,927 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:58:56,935 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:56" (1/1) ... [2021-11-21 01:58:56,935 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:56" (1/1) ... [2021-11-21 01:58:56,945 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:56" (1/1) ... [2021-11-21 01:58:56,946 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:56" (1/1) ... [2021-11-21 01:58:57,003 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:56" (1/1) ... [2021-11-21 01:58:57,017 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:56" (1/1) ... [2021-11-21 01:58:57,036 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:56" (1/1) ... [2021-11-21 01:58:57,051 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:58:57,052 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:58:57,053 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:58:57,053 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:58:57,054 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:56" (1/1) ... [2021-11-21 01:58:57,061 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:58:57,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:57,083 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:58:57,114 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:58:57,128 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:58:57,128 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:58:57,128 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:58:57,128 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:58:57,205 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:58:57,207 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:58:59,094 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:58:59,375 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:58:59,376 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-21 01:58:59,379 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:58:59 BoogieIcfgContainer [2021-11-21 01:58:59,379 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:58:59,382 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:58:59,382 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:58:59,386 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:58:59,386 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:58:55" (1/3) ... [2021-11-21 01:58:59,387 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4515e52 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:58:59, skipping insertion in model container [2021-11-21 01:58:59,387 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:56" (2/3) ... [2021-11-21 01:58:59,388 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4515e52 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:58:59, skipping insertion in model container [2021-11-21 01:58:59,388 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:58:59" (3/3) ... [2021-11-21 01:58:59,389 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem03_label48.c [2021-11-21 01:58:59,395 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:58:59,396 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:58:59,459 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:58:59,467 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 01:58:59,468 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:58:59,496 INFO L276 IsEmpty]: Start isEmpty. Operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 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 01:58:59,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-21 01:58:59,520 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:59,521 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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 01:58:59,521 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:58:59,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:59,527 INFO L85 PathProgramCache]: Analyzing trace with hash 209349882, now seen corresponding path program 1 times [2021-11-21 01:58:59,536 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:59,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [643848238] [2021-11-21 01:58:59,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:59,538 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:59,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:00,062 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 01:59:00,063 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:00,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [643848238] [2021-11-21 01:59:00,064 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [643848238] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:59:00,064 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:59:00,064 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:59:00,066 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474652123] [2021-11-21 01:59:00,066 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:59:00,072 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:59:00,073 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:00,104 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:59:00,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:59:00,110 INFO L87 Difference]: Start difference. First operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 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 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 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 01:59:01,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:01,064 INFO L93 Difference]: Finished difference Result 440 states and 860 transitions. [2021-11-21 01:59:01,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:59:01,068 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 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 143 [2021-11-21 01:59:01,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:01,083 INFO L225 Difference]: With dead ends: 440 [2021-11-21 01:59:01,083 INFO L226 Difference]: Without dead ends: 289 [2021-11-21 01:59:01,087 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 01:59:01,090 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 38 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 491 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 581 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 491 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:01,091 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 51 Invalid, 581 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 491 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-21 01:59:01,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-11-21 01:59:01,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2021-11-21 01:59:01,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 288 states have (on average 1.8090277777777777) internal successors, (521), 288 states have internal predecessors, (521), 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 01:59:01,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 521 transitions. [2021-11-21 01:59:01,153 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 521 transitions. Word has length 143 [2021-11-21 01:59:01,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:01,154 INFO L470 AbstractCegarLoop]: Abstraction has 289 states and 521 transitions. [2021-11-21 01:59:01,155 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 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 01:59:01,155 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 521 transitions. [2021-11-21 01:59:01,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-11-21 01:59:01,160 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:01,160 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:59:01,160 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:59:01,161 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:01,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:01,162 INFO L85 PathProgramCache]: Analyzing trace with hash 1094390169, now seen corresponding path program 1 times [2021-11-21 01:59:01,162 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:01,162 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1523957043] [2021-11-21 01:59:01,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:01,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:01,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:01,306 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:59:01,307 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:01,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1523957043] [2021-11-21 01:59:01,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1523957043] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:59:01,308 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:59:01,308 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:59:01,308 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [861254451] [2021-11-21 01:59:01,308 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:59:01,310 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:59:01,310 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:01,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:59:01,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:59:01,312 INFO L87 Difference]: Start difference. First operand 289 states and 521 transitions. Second operand has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 2 states have internal predecessors, (151), 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 01:59:02,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:02,027 INFO L93 Difference]: Finished difference Result 863 states and 1560 transitions. [2021-11-21 01:59:02,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:59:02,035 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 2 states have internal predecessors, (151), 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 151 [2021-11-21 01:59:02,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:02,040 INFO L225 Difference]: With dead ends: 863 [2021-11-21 01:59:02,040 INFO L226 Difference]: Without dead ends: 575 [2021-11-21 01:59:02,042 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 01:59:02,044 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 159 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 452 mSolverCounterSat, 170 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 622 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 170 IncrementalHoareTripleChecker+Valid, 452 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:02,044 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [159 Valid, 22 Invalid, 622 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [170 Valid, 452 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-21 01:59:02,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2021-11-21 01:59:02,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 575. [2021-11-21 01:59:02,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 574 states have (on average 1.7682926829268293) internal successors, (1015), 574 states have internal predecessors, (1015), 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 01:59:02,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 1015 transitions. [2021-11-21 01:59:02,108 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 1015 transitions. Word has length 151 [2021-11-21 01:59:02,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:02,109 INFO L470 AbstractCegarLoop]: Abstraction has 575 states and 1015 transitions. [2021-11-21 01:59:02,109 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 2 states have internal predecessors, (151), 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 01:59:02,109 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 1015 transitions. [2021-11-21 01:59:02,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-11-21 01:59:02,117 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:02,117 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:59:02,117 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 01:59:02,118 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:02,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:02,119 INFO L85 PathProgramCache]: Analyzing trace with hash 631562266, now seen corresponding path program 1 times [2021-11-21 01:59:02,119 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:02,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [612222046] [2021-11-21 01:59:02,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:02,119 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:02,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:02,239 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:59:02,239 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:02,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [612222046] [2021-11-21 01:59:02,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [612222046] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:59:02,240 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:59:02,240 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:59:02,241 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937746756] [2021-11-21 01:59:02,241 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:59:02,242 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:59:02,242 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:02,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:59:02,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:59:02,243 INFO L87 Difference]: Start difference. First operand 575 states and 1015 transitions. Second operand has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 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 01:59:02,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:02,963 INFO L93 Difference]: Finished difference Result 1723 states and 3043 transitions. [2021-11-21 01:59:02,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:59:02,964 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 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 152 [2021-11-21 01:59:02,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:02,971 INFO L225 Difference]: With dead ends: 1723 [2021-11-21 01:59:02,972 INFO L226 Difference]: Without dead ends: 1149 [2021-11-21 01:59:02,973 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 01:59:02,975 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 171 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 507 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 574 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 507 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:02,975 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [171 Valid, 43 Invalid, 574 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 507 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-21 01:59:02,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1149 states. [2021-11-21 01:59:03,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1149 to 1147. [2021-11-21 01:59:03,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1147 states, 1146 states have (on average 1.6413612565445026) internal successors, (1881), 1146 states have internal predecessors, (1881), 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 01:59:03,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1147 states to 1147 states and 1881 transitions. [2021-11-21 01:59:03,015 INFO L78 Accepts]: Start accepts. Automaton has 1147 states and 1881 transitions. Word has length 152 [2021-11-21 01:59:03,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:03,015 INFO L470 AbstractCegarLoop]: Abstraction has 1147 states and 1881 transitions. [2021-11-21 01:59:03,016 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 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 01:59:03,016 INFO L276 IsEmpty]: Start isEmpty. Operand 1147 states and 1881 transitions. [2021-11-21 01:59:03,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2021-11-21 01:59:03,020 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:03,020 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:59:03,021 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-21 01:59:03,021 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:03,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:03,022 INFO L85 PathProgramCache]: Analyzing trace with hash 14518036, now seen corresponding path program 1 times [2021-11-21 01:59:03,022 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:03,022 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [795894972] [2021-11-21 01:59:03,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:03,023 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:03,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:03,097 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:59:03,097 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:03,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [795894972] [2021-11-21 01:59:03,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [795894972] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:59:03,098 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:59:03,098 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:59:03,098 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [535242996] [2021-11-21 01:59:03,098 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:59:03,099 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:59:03,099 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:03,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:59:03,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:59:03,100 INFO L87 Difference]: Start difference. First operand 1147 states and 1881 transitions. Second operand has 3 states, 3 states have (on average 51.0) internal successors, (153), 2 states have internal predecessors, (153), 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 01:59:03,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:03,838 INFO L93 Difference]: Finished difference Result 2865 states and 4676 transitions. [2021-11-21 01:59:03,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:59:03,839 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 51.0) internal successors, (153), 2 states have internal predecessors, (153), 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 153 [2021-11-21 01:59:03,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:03,850 INFO L225 Difference]: With dead ends: 2865 [2021-11-21 01:59:03,850 INFO L226 Difference]: Without dead ends: 1719 [2021-11-21 01:59:03,852 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 01:59:03,854 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 157 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 455 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 157 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 607 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 455 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:03,854 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [157 Valid, 33 Invalid, 607 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 455 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-21 01:59:03,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1719 states. [2021-11-21 01:59:03,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1719 to 1719. [2021-11-21 01:59:03,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1719 states, 1718 states have (on average 1.5948777648428405) internal successors, (2740), 1718 states have internal predecessors, (2740), 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 01:59:03,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1719 states to 1719 states and 2740 transitions. [2021-11-21 01:59:03,907 INFO L78 Accepts]: Start accepts. Automaton has 1719 states and 2740 transitions. Word has length 153 [2021-11-21 01:59:03,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:03,908 INFO L470 AbstractCegarLoop]: Abstraction has 1719 states and 2740 transitions. [2021-11-21 01:59:03,908 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 51.0) internal successors, (153), 2 states have internal predecessors, (153), 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 01:59:03,909 INFO L276 IsEmpty]: Start isEmpty. Operand 1719 states and 2740 transitions. [2021-11-21 01:59:03,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-11-21 01:59:03,915 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:03,915 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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 01:59:03,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-21 01:59:03,916 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:03,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:03,919 INFO L85 PathProgramCache]: Analyzing trace with hash -316848354, now seen corresponding path program 1 times [2021-11-21 01:59:03,919 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:03,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [623407125] [2021-11-21 01:59:03,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:03,920 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:03,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:04,285 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:59:04,286 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:04,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [623407125] [2021-11-21 01:59:04,287 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [623407125] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:59:04,287 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:59:04,287 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 01:59:04,288 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [39781370] [2021-11-21 01:59:04,289 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:59:04,290 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:59:04,291 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:04,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:59:04,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:59:04,292 INFO L87 Difference]: Start difference. First operand 1719 states and 2740 transitions. Second operand has 4 states, 4 states have (on average 38.25) internal successors, (153), 3 states have internal predecessors, (153), 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 01:59:05,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:05,137 INFO L93 Difference]: Finished difference Result 3719 states and 5984 transitions. [2021-11-21 01:59:05,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:59:05,138 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 38.25) internal successors, (153), 3 states have internal predecessors, (153), 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 158 [2021-11-21 01:59:05,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:05,149 INFO L225 Difference]: With dead ends: 3719 [2021-11-21 01:59:05,149 INFO L226 Difference]: Without dead ends: 1719 [2021-11-21 01:59:05,152 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:59:05,160 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 220 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 635 mSolverCounterSat, 162 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 797 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 162 IncrementalHoareTripleChecker+Valid, 635 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:05,161 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [220 Valid, 11 Invalid, 797 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [162 Valid, 635 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-21 01:59:05,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1719 states. [2021-11-21 01:59:05,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1719 to 1719. [2021-11-21 01:59:05,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1719 states, 1718 states have (on average 1.4412107101280558) internal successors, (2476), 1718 states have internal predecessors, (2476), 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 01:59:05,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1719 states to 1719 states and 2476 transitions. [2021-11-21 01:59:05,218 INFO L78 Accepts]: Start accepts. Automaton has 1719 states and 2476 transitions. Word has length 158 [2021-11-21 01:59:05,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:05,220 INFO L470 AbstractCegarLoop]: Abstraction has 1719 states and 2476 transitions. [2021-11-21 01:59:05,220 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 38.25) internal successors, (153), 3 states have internal predecessors, (153), 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 01:59:05,220 INFO L276 IsEmpty]: Start isEmpty. Operand 1719 states and 2476 transitions. [2021-11-21 01:59:05,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-21 01:59:05,231 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:05,232 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 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, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:59:05,232 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-21 01:59:05,232 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:05,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:05,234 INFO L85 PathProgramCache]: Analyzing trace with hash 1023962969, now seen corresponding path program 1 times [2021-11-21 01:59:05,234 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:05,234 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [645010191] [2021-11-21 01:59:05,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:05,235 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:05,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:05,322 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:59:05,323 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:05,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [645010191] [2021-11-21 01:59:05,323 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [645010191] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:59:05,323 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:59:05,324 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:59:05,324 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954347280] [2021-11-21 01:59:05,324 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:59:05,325 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:59:05,325 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:05,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:59:05,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:59:05,326 INFO L87 Difference]: Start difference. First operand 1719 states and 2476 transitions. Second operand has 3 states, 3 states have (on average 51.666666666666664) internal successors, (155), 2 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 01:59:05,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:05,982 INFO L93 Difference]: Finished difference Result 5153 states and 7425 transitions. [2021-11-21 01:59:05,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:59:05,983 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 51.666666666666664) internal successors, (155), 2 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) Word has length 160 [2021-11-21 01:59:05,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:06,001 INFO L225 Difference]: With dead ends: 5153 [2021-11-21 01:59:06,001 INFO L226 Difference]: Without dead ends: 3435 [2021-11-21 01:59:06,004 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 01:59:06,006 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 142 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 391 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 475 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 391 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:06,008 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [142 Valid, 76 Invalid, 475 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 391 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 01:59:06,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3435 states. [2021-11-21 01:59:06,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3435 to 3435. [2021-11-21 01:59:06,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3435 states, 3434 states have (on average 1.2813046010483402) internal successors, (4400), 3434 states have internal predecessors, (4400), 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 01:59:06,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3435 states to 3435 states and 4400 transitions. [2021-11-21 01:59:06,096 INFO L78 Accepts]: Start accepts. Automaton has 3435 states and 4400 transitions. Word has length 160 [2021-11-21 01:59:06,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:06,096 INFO L470 AbstractCegarLoop]: Abstraction has 3435 states and 4400 transitions. [2021-11-21 01:59:06,096 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 51.666666666666664) internal successors, (155), 2 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 01:59:06,097 INFO L276 IsEmpty]: Start isEmpty. Operand 3435 states and 4400 transitions. [2021-11-21 01:59:06,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-11-21 01:59:06,104 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:06,104 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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 01:59:06,104 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-21 01:59:06,105 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:06,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:06,105 INFO L85 PathProgramCache]: Analyzing trace with hash 10691747, now seen corresponding path program 1 times [2021-11-21 01:59:06,106 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:06,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1135171465] [2021-11-21 01:59:06,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:06,106 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:06,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:06,359 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 30 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:59:06,359 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:06,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1135171465] [2021-11-21 01:59:06,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1135171465] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:59:06,360 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:59:06,360 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 01:59:06,360 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156997134] [2021-11-21 01:59:06,360 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:59:06,361 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:59:06,361 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:06,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:59:06,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:59:06,362 INFO L87 Difference]: Start difference. First operand 3435 states and 4400 transitions. Second operand has 4 states, 4 states have (on average 43.5) internal successors, (174), 3 states have internal predecessors, (174), 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 01:59:07,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:07,414 INFO L93 Difference]: Finished difference Result 7868 states and 10135 transitions. [2021-11-21 01:59:07,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:59:07,415 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 43.5) internal successors, (174), 3 states have internal predecessors, (174), 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 01:59:07,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:07,437 INFO L225 Difference]: With dead ends: 7868 [2021-11-21 01:59:07,438 INFO L226 Difference]: Without dead ends: 4293 [2021-11-21 01:59:07,442 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:59:07,443 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 123 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 844 mSolverCounterSat, 143 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 987 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 143 IncrementalHoareTripleChecker+Valid, 844 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:07,444 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [123 Valid, 62 Invalid, 987 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [143 Valid, 844 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-21 01:59:07,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4293 states. [2021-11-21 01:59:07,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4293 to 4293. [2021-11-21 01:59:07,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4293 states, 4292 states have (on average 1.283550792171482) internal successors, (5509), 4292 states have internal predecessors, (5509), 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 01:59:07,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4293 states to 4293 states and 5509 transitions. [2021-11-21 01:59:07,559 INFO L78 Accepts]: Start accepts. Automaton has 4293 states and 5509 transitions. Word has length 174 [2021-11-21 01:59:07,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:07,560 INFO L470 AbstractCegarLoop]: Abstraction has 4293 states and 5509 transitions. [2021-11-21 01:59:07,560 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 43.5) internal successors, (174), 3 states have internal predecessors, (174), 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 01:59:07,560 INFO L276 IsEmpty]: Start isEmpty. Operand 4293 states and 5509 transitions. [2021-11-21 01:59:07,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2021-11-21 01:59:07,569 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:07,570 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 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, 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, 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, 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, 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 01:59:07,570 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-21 01:59:07,570 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:07,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:07,572 INFO L85 PathProgramCache]: Analyzing trace with hash 1441040766, now seen corresponding path program 1 times [2021-11-21 01:59:07,572 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:07,572 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2075125459] [2021-11-21 01:59:07,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:07,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:07,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:07,678 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 37 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:59:07,678 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:07,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2075125459] [2021-11-21 01:59:07,678 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2075125459] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:59:07,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [478494520] [2021-11-21 01:59:07,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:07,679 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:07,679 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:07,683 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:07,709 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:59:07,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:07,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 429 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:59:07,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:08,373 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-21 01:59:08,374 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:59:08,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [478494520] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:59:08,374 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:59:08,374 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-21 01:59:08,375 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712664127] [2021-11-21 01:59:08,375 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:59:08,375 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:59:08,376 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:08,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:59:08,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:59:08,377 INFO L87 Difference]: Start difference. First operand 4293 states and 5509 transitions. Second operand has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 3 states have internal predecessors, (151), 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 01:59:09,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:09,050 INFO L93 Difference]: Finished difference Result 9157 states and 11863 transitions. [2021-11-21 01:59:09,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:59:09,051 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 3 states have internal predecessors, (151), 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 181 [2021-11-21 01:59:09,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:09,074 INFO L225 Difference]: With dead ends: 9157 [2021-11-21 01:59:09,074 INFO L226 Difference]: Without dead ends: 4865 [2021-11-21 01:59:09,079 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:59:09,080 INFO L933 BasicCegarLoop]: 196 mSDtfsCounter, 8 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 457 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 512 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 457 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:09,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 200 Invalid, 512 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 457 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 01:59:09,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4865 states. [2021-11-21 01:59:09,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4865 to 4865. [2021-11-21 01:59:09,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4865 states, 4864 states have (on average 1.2939967105263157) internal successors, (6294), 4864 states have internal predecessors, (6294), 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 01:59:09,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4865 states to 4865 states and 6294 transitions. [2021-11-21 01:59:09,192 INFO L78 Accepts]: Start accepts. Automaton has 4865 states and 6294 transitions. Word has length 181 [2021-11-21 01:59:09,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:09,193 INFO L470 AbstractCegarLoop]: Abstraction has 4865 states and 6294 transitions. [2021-11-21 01:59:09,193 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 3 states have internal predecessors, (151), 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 01:59:09,193 INFO L276 IsEmpty]: Start isEmpty. Operand 4865 states and 6294 transitions. [2021-11-21 01:59:09,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2021-11-21 01:59:09,203 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:09,203 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 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, 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, 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, 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, 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 01:59:09,240 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:09,425 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:09,425 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:09,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:09,426 INFO L85 PathProgramCache]: Analyzing trace with hash -1153488478, now seen corresponding path program 1 times [2021-11-21 01:59:09,426 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:09,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1372721833] [2021-11-21 01:59:09,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:09,426 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:09,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:09,515 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 48 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:59:09,515 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:09,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1372721833] [2021-11-21 01:59:09,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1372721833] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:59:09,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [938285183] [2021-11-21 01:59:09,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:09,516 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:09,516 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:09,517 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:09,537 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:59:09,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:09,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 474 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:59:09,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:10,020 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 48 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:59:10,020 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:59:10,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [938285183] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:59:10,020 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:59:10,021 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-21 01:59:10,021 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1866541998] [2021-11-21 01:59:10,021 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:59:10,022 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:59:10,022 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:10,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:59:10,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:59:10,027 INFO L87 Difference]: Start difference. First operand 4865 states and 6294 transitions. Second operand has 3 states, 3 states have (on average 59.0) internal successors, (177), 3 states have internal predecessors, (177), 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 01:59:10,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:10,735 INFO L93 Difference]: Finished difference Result 12589 states and 16663 transitions. [2021-11-21 01:59:10,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:59:10,743 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 59.0) internal successors, (177), 3 states have internal predecessors, (177), 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 187 [2021-11-21 01:59:10,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:10,791 INFO L225 Difference]: With dead ends: 12589 [2021-11-21 01:59:10,791 INFO L226 Difference]: Without dead ends: 7725 [2021-11-21 01:59:10,796 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 186 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:59:10,798 INFO L933 BasicCegarLoop]: 219 mSDtfsCounter, 10 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 376 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 477 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 376 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:10,798 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 223 Invalid, 477 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 376 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 01:59:10,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7725 states. [2021-11-21 01:59:10,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7725 to 7439. [2021-11-21 01:59:10,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7439 states, 7438 states have (on average 1.2264049475665502) internal successors, (9122), 7438 states have internal predecessors, (9122), 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 01:59:10,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7439 states to 7439 states and 9122 transitions. [2021-11-21 01:59:10,981 INFO L78 Accepts]: Start accepts. Automaton has 7439 states and 9122 transitions. Word has length 187 [2021-11-21 01:59:10,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:10,981 INFO L470 AbstractCegarLoop]: Abstraction has 7439 states and 9122 transitions. [2021-11-21 01:59:10,982 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 59.0) internal successors, (177), 3 states have internal predecessors, (177), 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 01:59:10,982 INFO L276 IsEmpty]: Start isEmpty. Operand 7439 states and 9122 transitions. [2021-11-21 01:59:10,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2021-11-21 01:59:10,994 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:10,994 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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 01:59:11,033 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:11,222 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:11,222 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:11,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:11,223 INFO L85 PathProgramCache]: Analyzing trace with hash -1315649499, now seen corresponding path program 1 times [2021-11-21 01:59:11,223 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:11,223 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2078059721] [2021-11-21 01:59:11,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:11,223 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:11,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:11,333 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 62 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:59:11,333 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:11,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2078059721] [2021-11-21 01:59:11,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2078059721] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:59:11,334 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:59:11,334 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:59:11,334 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232655299] [2021-11-21 01:59:11,334 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:59:11,335 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:59:11,335 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:11,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:59:11,335 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:59:11,336 INFO L87 Difference]: Start difference. First operand 7439 states and 9122 transitions. Second operand has 3 states, 3 states have (on average 68.66666666666667) internal successors, (206), 2 states have internal predecessors, (206), 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 01:59:11,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:11,920 INFO L93 Difference]: Finished difference Result 16021 states and 19549 transitions. [2021-11-21 01:59:11,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:59:11,920 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 68.66666666666667) internal successors, (206), 2 states have internal predecessors, (206), 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 206 [2021-11-21 01:59:11,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:11,946 INFO L225 Difference]: With dead ends: 16021 [2021-11-21 01:59:11,946 INFO L226 Difference]: Without dead ends: 8583 [2021-11-21 01:59:11,955 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 01:59:11,955 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 89 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 427 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 451 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 427 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:11,956 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 52 Invalid, 451 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 427 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:59:11,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8583 states. [2021-11-21 01:59:12,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8583 to 8583. [2021-11-21 01:59:12,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8583 states, 8582 states have (on average 1.2130039617804707) internal successors, (10410), 8582 states have internal predecessors, (10410), 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 01:59:12,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8583 states to 8583 states and 10410 transitions. [2021-11-21 01:59:12,184 INFO L78 Accepts]: Start accepts. Automaton has 8583 states and 10410 transitions. Word has length 206 [2021-11-21 01:59:12,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:12,185 INFO L470 AbstractCegarLoop]: Abstraction has 8583 states and 10410 transitions. [2021-11-21 01:59:12,186 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 68.66666666666667) internal successors, (206), 2 states have internal predecessors, (206), 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 01:59:12,186 INFO L276 IsEmpty]: Start isEmpty. Operand 8583 states and 10410 transitions. [2021-11-21 01:59:12,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2021-11-21 01:59:12,200 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:12,203 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 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, 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, 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, 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, 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 01:59:12,203 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-21 01:59:12,203 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:12,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:12,204 INFO L85 PathProgramCache]: Analyzing trace with hash -1345060608, now seen corresponding path program 1 times [2021-11-21 01:59:12,204 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:12,204 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1833817260] [2021-11-21 01:59:12,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:12,205 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:12,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:12,349 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 69 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:59:12,349 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:12,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1833817260] [2021-11-21 01:59:12,350 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1833817260] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:59:12,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [208953394] [2021-11-21 01:59:12,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:12,350 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:12,351 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:12,351 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:12,377 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:59:12,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:12,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 457 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:59:12,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:13,254 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 75 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:59:13,255 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:59:13,256 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [208953394] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:59:13,256 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:59:13,256 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-21 01:59:13,257 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489382316] [2021-11-21 01:59:13,257 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:59:13,257 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:59:13,257 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:13,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:59:13,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:59:13,259 INFO L87 Difference]: Start difference. First operand 8583 states and 10410 transitions. Second operand has 3 states, 3 states have (on average 71.0) internal successors, (213), 3 states have internal predecessors, (213), 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 01:59:13,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:13,956 INFO L93 Difference]: Finished difference Result 20168 states and 24513 transitions. [2021-11-21 01:59:13,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:59:13,956 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 71.0) internal successors, (213), 3 states have internal predecessors, (213), 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 213 [2021-11-21 01:59:13,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:13,980 INFO L225 Difference]: With dead ends: 20168 [2021-11-21 01:59:13,981 INFO L226 Difference]: Without dead ends: 11586 [2021-11-21 01:59:13,991 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 212 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:59:13,992 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 82 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 441 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 497 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 441 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:13,993 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 78 Invalid, 497 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 441 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 01:59:14,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11586 states. [2021-11-21 01:59:14,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11586 to 11586. [2021-11-21 01:59:14,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11586 states, 11585 states have (on average 1.1921450151057402) internal successors, (13811), 11585 states have internal predecessors, (13811), 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 01:59:14,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11586 states to 11586 states and 13811 transitions. [2021-11-21 01:59:14,227 INFO L78 Accepts]: Start accepts. Automaton has 11586 states and 13811 transitions. Word has length 213 [2021-11-21 01:59:14,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:14,228 INFO L470 AbstractCegarLoop]: Abstraction has 11586 states and 13811 transitions. [2021-11-21 01:59:14,228 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 71.0) internal successors, (213), 3 states have internal predecessors, (213), 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 01:59:14,228 INFO L276 IsEmpty]: Start isEmpty. Operand 11586 states and 13811 transitions. [2021-11-21 01:59:14,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2021-11-21 01:59:14,248 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:14,249 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 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, 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, 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, 1, 1] [2021-11-21 01:59:14,294 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:14,470 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-21 01:59:14,470 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:14,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:14,471 INFO L85 PathProgramCache]: Analyzing trace with hash -1143611603, now seen corresponding path program 1 times [2021-11-21 01:59:14,471 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:14,471 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1542264489] [2021-11-21 01:59:14,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:14,471 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:14,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:14,580 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 86 proven. 6 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2021-11-21 01:59:14,580 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:14,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1542264489] [2021-11-21 01:59:14,581 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1542264489] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:59:14,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1249069071] [2021-11-21 01:59:14,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:14,581 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:14,581 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:14,586 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:14,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:59:14,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:14,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 558 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:59:14,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:15,216 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 87 proven. 0 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-21 01:59:15,216 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:59:15,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1249069071] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:59:15,217 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:59:15,217 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-21 01:59:15,220 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910937239] [2021-11-21 01:59:15,220 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:59:15,221 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:59:15,221 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:15,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:59:15,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:59:15,222 INFO L87 Difference]: Start difference. First operand 11586 states and 13811 transitions. Second operand has 3 states, 3 states have (on average 62.666666666666664) internal successors, (188), 3 states have internal predecessors, (188), 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 01:59:15,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:15,930 INFO L93 Difference]: Finished difference Result 31894 states and 38026 transitions. [2021-11-21 01:59:15,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:59:15,931 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 62.666666666666664) internal successors, (188), 3 states have internal predecessors, (188), 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 231 [2021-11-21 01:59:15,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:15,968 INFO L225 Difference]: With dead ends: 31894 [2021-11-21 01:59:15,968 INFO L226 Difference]: Without dead ends: 20452 [2021-11-21 01:59:15,979 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 230 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:59:15,980 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 24 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 438 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 438 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:15,981 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 78 Invalid, 491 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 438 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 01:59:16,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20452 states. [2021-11-21 01:59:16,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20452 to 19594. [2021-11-21 01:59:16,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19594 states, 19593 states have (on average 1.177818608686776) internal successors, (23077), 19593 states have internal predecessors, (23077), 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 01:59:16,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19594 states to 19594 states and 23077 transitions. [2021-11-21 01:59:16,309 INFO L78 Accepts]: Start accepts. Automaton has 19594 states and 23077 transitions. Word has length 231 [2021-11-21 01:59:16,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:16,310 INFO L470 AbstractCegarLoop]: Abstraction has 19594 states and 23077 transitions. [2021-11-21 01:59:16,310 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 62.666666666666664) internal successors, (188), 3 states have internal predecessors, (188), 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 01:59:16,311 INFO L276 IsEmpty]: Start isEmpty. Operand 19594 states and 23077 transitions. [2021-11-21 01:59:16,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 240 [2021-11-21 01:59:16,336 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:16,336 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:59:16,373 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:16,550 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:16,550 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:16,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:16,551 INFO L85 PathProgramCache]: Analyzing trace with hash 189651727, now seen corresponding path program 1 times [2021-11-21 01:59:16,551 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:16,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [384697253] [2021-11-21 01:59:16,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:16,551 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:16,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:16,964 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 30 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:59:16,964 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:16,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [384697253] [2021-11-21 01:59:16,965 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [384697253] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:59:16,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [112581519] [2021-11-21 01:59:16,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:16,965 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:16,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:16,969 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:16,989 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:59:17,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:17,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 450 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:59:17,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:17,602 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 95 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:59:17,602 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:59:17,602 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [112581519] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:59:17,602 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:59:17,602 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-21 01:59:17,603 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206859560] [2021-11-21 01:59:17,603 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:59:17,603 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:59:17,603 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:17,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:59:17,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:59:17,604 INFO L87 Difference]: Start difference. First operand 19594 states and 23077 transitions. Second operand has 3 states, 3 states have (on average 79.66666666666667) internal successors, (239), 3 states have internal predecessors, (239), 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 01:59:18,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:18,258 INFO L93 Difference]: Finished difference Result 42190 states and 50338 transitions. [2021-11-21 01:59:18,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:59:18,258 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 79.66666666666667) internal successors, (239), 3 states have internal predecessors, (239), 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 239 [2021-11-21 01:59:18,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:18,303 INFO L225 Difference]: With dead ends: 42190 [2021-11-21 01:59:18,303 INFO L226 Difference]: Without dead ends: 22740 [2021-11-21 01:59:18,320 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 239 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:59:18,321 INFO L933 BasicCegarLoop]: 174 mSDtfsCounter, 43 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 435 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 484 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 435 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:18,321 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 178 Invalid, 484 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 435 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:59:18,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22740 states. [2021-11-21 01:59:18,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22740 to 22454. [2021-11-21 01:59:18,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22454 states, 22453 states have (on average 1.1931590433349664) internal successors, (26790), 22453 states have internal predecessors, (26790), 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 01:59:18,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22454 states to 22454 states and 26790 transitions. [2021-11-21 01:59:18,745 INFO L78 Accepts]: Start accepts. Automaton has 22454 states and 26790 transitions. Word has length 239 [2021-11-21 01:59:18,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:18,746 INFO L470 AbstractCegarLoop]: Abstraction has 22454 states and 26790 transitions. [2021-11-21 01:59:18,746 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 79.66666666666667) internal successors, (239), 3 states have internal predecessors, (239), 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 01:59:18,746 INFO L276 IsEmpty]: Start isEmpty. Operand 22454 states and 26790 transitions. [2021-11-21 01:59:18,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 281 [2021-11-21 01:59:18,781 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:18,781 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:59:18,819 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:19,002 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-21 01:59:19,003 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:19,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:19,003 INFO L85 PathProgramCache]: Analyzing trace with hash -2033454439, now seen corresponding path program 1 times [2021-11-21 01:59:19,003 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:19,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1842842691] [2021-11-21 01:59:19,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:19,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:19,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:19,148 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 135 proven. 0 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-21 01:59:19,148 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:19,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1842842691] [2021-11-21 01:59:19,149 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1842842691] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:59:19,149 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:59:19,149 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:59:19,149 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077004711] [2021-11-21 01:59:19,149 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:59:19,150 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:59:19,150 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:19,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:59:19,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:59:19,151 INFO L87 Difference]: Start difference. First operand 22454 states and 26790 transitions. Second operand has 3 states, 3 states have (on average 72.66666666666667) internal successors, (218), 2 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 01:59:19,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:19,784 INFO L93 Difference]: Finished difference Result 45193 states and 53885 transitions. [2021-11-21 01:59:19,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:59:19,785 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 72.66666666666667) internal successors, (218), 2 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) Word has length 280 [2021-11-21 01:59:19,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:19,816 INFO L225 Difference]: With dead ends: 45193 [2021-11-21 01:59:19,816 INFO L226 Difference]: Without dead ends: 22883 [2021-11-21 01:59:19,828 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 01:59:19,829 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 72 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 396 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 397 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 396 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:19,829 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 81 Invalid, 397 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 396 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:59:19,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22883 states. [2021-11-21 01:59:20,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22883 to 22883. [2021-11-21 01:59:20,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22883 states, 22882 states have (on average 1.1907175946158552) internal successors, (27246), 22882 states have internal predecessors, (27246), 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 01:59:20,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22883 states to 22883 states and 27246 transitions. [2021-11-21 01:59:20,184 INFO L78 Accepts]: Start accepts. Automaton has 22883 states and 27246 transitions. Word has length 280 [2021-11-21 01:59:20,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:20,185 INFO L470 AbstractCegarLoop]: Abstraction has 22883 states and 27246 transitions. [2021-11-21 01:59:20,185 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 72.66666666666667) internal successors, (218), 2 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 01:59:20,185 INFO L276 IsEmpty]: Start isEmpty. Operand 22883 states and 27246 transitions. [2021-11-21 01:59:20,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 282 [2021-11-21 01:59:20,208 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:20,209 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:59:20,209 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-21 01:59:20,209 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:20,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:20,210 INFO L85 PathProgramCache]: Analyzing trace with hash 316256146, now seen corresponding path program 1 times [2021-11-21 01:59:20,210 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:20,210 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [402859375] [2021-11-21 01:59:20,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:20,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:20,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:20,381 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 137 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:59:20,382 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:20,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [402859375] [2021-11-21 01:59:20,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [402859375] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:59:20,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658675322] [2021-11-21 01:59:20,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:20,383 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:20,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:20,386 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:20,408 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:59:20,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:20,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 528 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 01:59:20,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:21,049 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 178 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:59:21,049 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:59:21,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1658675322] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:59:21,050 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:59:21,050 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-21 01:59:21,050 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872898208] [2021-11-21 01:59:21,050 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:59:21,051 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:59:21,051 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:21,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:59:21,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:59:21,052 INFO L87 Difference]: Start difference. First operand 22883 states and 27246 transitions. Second operand has 3 states, 3 states have (on average 93.66666666666667) internal successors, (281), 3 states have internal predecessors, (281), 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 01:59:21,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:21,704 INFO L93 Difference]: Finished difference Result 49340 states and 58812 transitions. [2021-11-21 01:59:21,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:59:21,705 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 93.66666666666667) internal successors, (281), 3 states have internal predecessors, (281), 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 281 [2021-11-21 01:59:21,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:21,739 INFO L225 Difference]: With dead ends: 49340 [2021-11-21 01:59:21,739 INFO L226 Difference]: Without dead ends: 27030 [2021-11-21 01:59:21,753 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 280 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:59:21,753 INFO L933 BasicCegarLoop]: 183 mSDtfsCounter, 127 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 418 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 482 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 418 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:21,754 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [127 Valid, 186 Invalid, 482 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 418 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:59:21,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27030 states. [2021-11-21 01:59:22,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27030 to 27030. [2021-11-21 01:59:22,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27030 states, 27029 states have (on average 1.1804358281845426) internal successors, (31906), 27029 states have internal predecessors, (31906), 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 01:59:22,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27030 states to 27030 states and 31906 transitions. [2021-11-21 01:59:22,278 INFO L78 Accepts]: Start accepts. Automaton has 27030 states and 31906 transitions. Word has length 281 [2021-11-21 01:59:22,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:22,279 INFO L470 AbstractCegarLoop]: Abstraction has 27030 states and 31906 transitions. [2021-11-21 01:59:22,279 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 93.66666666666667) internal successors, (281), 3 states have internal predecessors, (281), 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 01:59:22,280 INFO L276 IsEmpty]: Start isEmpty. Operand 27030 states and 31906 transitions. [2021-11-21 01:59:22,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 283 [2021-11-21 01:59:22,302 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:22,302 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 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, 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, 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, 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 01:59:22,339 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:22,518 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-21 01:59:22,518 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:22,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:22,519 INFO L85 PathProgramCache]: Analyzing trace with hash 1335578823, now seen corresponding path program 1 times [2021-11-21 01:59:22,519 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:22,519 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1722412530] [2021-11-21 01:59:22,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:22,519 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:22,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:22,639 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 102 proven. 6 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-21 01:59:22,639 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:22,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1722412530] [2021-11-21 01:59:22,639 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1722412530] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:59:22,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1458177811] [2021-11-21 01:59:22,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:22,640 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:22,640 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:22,642 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:22,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:59:22,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:22,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 604 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 01:59:22,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:23,281 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 138 proven. 0 refuted. 0 times theorem prover too weak. 115 trivial. 0 not checked. [2021-11-21 01:59:23,281 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:59:23,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1458177811] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:59:23,282 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:59:23,282 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-21 01:59:23,282 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122829175] [2021-11-21 01:59:23,282 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:59:23,283 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:59:23,283 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:23,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:59:23,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:59:23,284 INFO L87 Difference]: Start difference. First operand 27030 states and 31906 transitions. Second operand has 3 states, 3 states have (on average 70.0) internal successors, (210), 3 states have internal predecessors, (210), 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 01:59:24,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:24,036 INFO L93 Difference]: Finished difference Result 62353 states and 73893 transitions. [2021-11-21 01:59:24,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:59:24,036 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 70.0) internal successors, (210), 3 states have internal predecessors, (210), 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 282 [2021-11-21 01:59:24,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:24,066 INFO L225 Difference]: With dead ends: 62353 [2021-11-21 01:59:24,066 INFO L226 Difference]: Without dead ends: 35896 [2021-11-21 01:59:24,078 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 281 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:59:24,079 INFO L933 BasicCegarLoop]: 221 mSDtfsCounter, 9 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 380 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 237 SdHoareTripleChecker+Invalid, 467 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 380 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:24,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 237 Invalid, 467 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 380 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:59:24,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35896 states. [2021-11-21 01:59:24,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35896 to 34323. [2021-11-21 01:59:24,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34323 states, 34322 states have (on average 1.1789522755084203) internal successors, (40464), 34322 states have internal predecessors, (40464), 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 01:59:24,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34323 states to 34323 states and 40464 transitions. [2021-11-21 01:59:24,709 INFO L78 Accepts]: Start accepts. Automaton has 34323 states and 40464 transitions. Word has length 282 [2021-11-21 01:59:24,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:24,710 INFO L470 AbstractCegarLoop]: Abstraction has 34323 states and 40464 transitions. [2021-11-21 01:59:24,710 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 70.0) internal successors, (210), 3 states have internal predecessors, (210), 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 01:59:24,711 INFO L276 IsEmpty]: Start isEmpty. Operand 34323 states and 40464 transitions. [2021-11-21 01:59:24,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 303 [2021-11-21 01:59:24,747 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:24,748 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 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, 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, 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, 1] [2021-11-21 01:59:24,783 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:24,962 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-21 01:59:24,963 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:24,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:24,963 INFO L85 PathProgramCache]: Analyzing trace with hash -1720137523, now seen corresponding path program 1 times [2021-11-21 01:59:24,963 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:24,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1457061061] [2021-11-21 01:59:24,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:24,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:25,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:25,075 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 68 proven. 6 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2021-11-21 01:59:25,075 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:25,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1457061061] [2021-11-21 01:59:25,076 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1457061061] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:59:25,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [244717795] [2021-11-21 01:59:25,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:25,077 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:25,077 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:25,078 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:25,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:59:25,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:25,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 565 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:59:25,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:25,833 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 74 proven. 0 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2021-11-21 01:59:25,833 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:59:25,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [244717795] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:59:25,834 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:59:25,834 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-21 01:59:25,834 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981664382] [2021-11-21 01:59:25,834 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:59:25,835 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:59:25,835 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:25,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:59:25,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:59:25,836 INFO L87 Difference]: Start difference. First operand 34323 states and 40464 transitions. Second operand has 4 states, 4 states have (on average 44.75) internal successors, (179), 3 states have internal predecessors, (179), 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 01:59:26,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:26,966 INFO L93 Difference]: Finished difference Result 116838 states and 137315 transitions. [2021-11-21 01:59:26,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:59:26,966 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 44.75) internal successors, (179), 3 states have internal predecessors, (179), 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 302 [2021-11-21 01:59:26,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:27,040 INFO L225 Difference]: With dead ends: 116838 [2021-11-21 01:59:27,040 INFO L226 Difference]: Without dead ends: 83088 [2021-11-21 01:59:27,060 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 300 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:59:27,061 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 345 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 560 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 345 SdHoareTripleChecker+Valid, 188 SdHoareTripleChecker+Invalid, 657 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 560 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:27,061 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [345 Valid, 188 Invalid, 657 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 560 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-21 01:59:27,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83088 states. [2021-11-21 01:59:28,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83088 to 75507. [2021-11-21 01:59:28,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75507 states, 75506 states have (on average 1.174423224644399) internal successors, (88676), 75506 states have internal predecessors, (88676), 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 01:59:28,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75507 states to 75507 states and 88676 transitions. [2021-11-21 01:59:28,404 INFO L78 Accepts]: Start accepts. Automaton has 75507 states and 88676 transitions. Word has length 302 [2021-11-21 01:59:28,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:28,404 INFO L470 AbstractCegarLoop]: Abstraction has 75507 states and 88676 transitions. [2021-11-21 01:59:28,404 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 44.75) internal successors, (179), 3 states have internal predecessors, (179), 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 01:59:28,404 INFO L276 IsEmpty]: Start isEmpty. Operand 75507 states and 88676 transitions. [2021-11-21 01:59:28,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2021-11-21 01:59:28,687 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:28,690 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 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, 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, 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, 1] [2021-11-21 01:59:28,742 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:28,922 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-21 01:59:28,922 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:28,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:28,923 INFO L85 PathProgramCache]: Analyzing trace with hash 1125999590, now seen corresponding path program 1 times [2021-11-21 01:59:28,923 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:28,923 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1343576695] [2021-11-21 01:59:28,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:28,924 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:28,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:29,025 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 74 proven. 6 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2021-11-21 01:59:29,026 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:29,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1343576695] [2021-11-21 01:59:29,026 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1343576695] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:59:29,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1282518775] [2021-11-21 01:59:29,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:29,026 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:29,027 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:29,030 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:29,034 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c691c2c5-8b07-4c5c-b5b0-3f028e00b902/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 01:59:29,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:29,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 576 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:59:29,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:29,876 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-21 01:59:29,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:59:30,674 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-21 01:59:30,674 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1282518775] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:59:30,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [357083179] [2021-11-21 01:59:30,701 INFO L159 IcfgInterpreter]: Started Sifa with 145 locations of interest [2021-11-21 01:59:30,706 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:59:30,711 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:59:30,718 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:59:30,718 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:11:45,753 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 15 [2021-11-21 02:11:45,778 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 15 [2021-11-21 02:11:53,162 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 15 [2021-11-21 02:11:53,949 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:12:05,573 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:12:05,573 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 02:12:05,574 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 5 [2021-11-21 02:12:05,574 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292450410] [2021-11-21 02:12:05,574 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 02:12:05,575 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 02:12:05,575 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:12:05,575 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 02:12:05,576 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=318, Unknown=0, NotChecked=0, Total=420 [2021-11-21 02:12:05,576 INFO L87 Difference]: Start difference. First operand 75507 states and 88676 transitions. Second operand has 6 states, 6 states have (on average 75.16666666666667) internal successors, (451), 5 states have internal predecessors, (451), 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 02:12:09,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:12:09,459 INFO L93 Difference]: Finished difference Result 377817 states and 443083 transitions. [2021-11-21 02:12:09,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-21 02:12:09,459 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 75.16666666666667) internal successors, (451), 5 states have internal predecessors, (451), 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 305 [2021-11-21 02:12:09,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:12:10,129 INFO L225 Difference]: With dead ends: 377817 [2021-11-21 02:12:10,129 INFO L226 Difference]: Without dead ends: 302883 [2021-11-21 02:12:10,182 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 927 GetRequests, 757 SyntacticMatches, 140 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1463 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=189, Invalid=803, Unknown=0, NotChecked=0, Total=992 [2021-11-21 02:12:10,183 INFO L933 BasicCegarLoop]: 95 mSDtfsCounter, 1619 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 2168 mSolverCounterSat, 1016 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1619 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 3184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1016 IncrementalHoareTripleChecker+Valid, 2168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2021-11-21 02:12:10,183 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1619 Valid, 150 Invalid, 3184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1016 Valid, 2168 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2021-11-21 02:12:10,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302883 states.