./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/mem_slave_tlm.2.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/mem_slave_tlm.2.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V --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 68ec02878969b041c7f7a32af94816f6626efeef23b5da7ea64f6e61f6ff6501 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:29:23,235 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:29:23,238 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:29:23,323 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:29:23,324 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:29:23,330 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:29:23,332 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:29:23,338 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:29:23,342 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:29:23,351 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:29:23,352 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:29:23,355 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:29:23,355 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:29:23,358 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:29:23,361 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:29:23,367 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:29:23,369 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:29:23,371 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:29:23,374 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:29:23,384 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:29:23,386 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:29:23,390 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:29:23,394 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:29:23,395 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:29:23,407 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:29:23,408 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:29:23,408 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:29:23,411 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:29:23,412 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:29:23,414 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:29:23,414 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:29:23,416 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:29:23,418 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:29:23,420 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:29:23,423 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:29:23,423 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:29:23,424 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:29:23,425 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:29:23,425 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:29:23,426 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:29:23,427 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:29:23,429 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:29:23,468 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:29:23,469 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:29:23,469 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:29:23,469 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:29:23,470 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:29:23,470 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:29:23,471 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:29:23,471 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:29:23,471 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:29:23,472 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:29:23,472 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:29:23,474 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:29:23,474 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:29:23,474 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:29:23,474 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:29:23,475 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:29:23,475 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:29:23,475 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:29:23,477 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:29:23,477 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:29:23,478 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:29:23,478 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:29:23,478 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:29:23,479 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:29:23,479 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:29:23,479 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:29:23,481 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:29:23,482 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:29:23,483 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:29:23,483 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:29:23,483 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:29:23,484 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:29:23,484 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:29:23,484 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:29:23,485 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:29:23,485 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:29:23,486 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:29:23,487 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:29:23,487 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:29:23,487 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:29:23,487 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:29:23,488 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_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 68ec02878969b041c7f7a32af94816f6626efeef23b5da7ea64f6e61f6ff6501 [2021-11-23 03:29:23,868 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:29:23,902 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:29:23,906 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:29:23,907 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:29:23,908 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:29:23,910 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/systemc/mem_slave_tlm.2.cil.c [2021-11-23 03:29:24,017 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/data/0d6d8ad4e/d8e4c6e92c004338bd1024c9e869e0d1/FLAG640e738bb [2021-11-23 03:29:24,775 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:29:24,777 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/sv-benchmarks/c/systemc/mem_slave_tlm.2.cil.c [2021-11-23 03:29:24,806 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/data/0d6d8ad4e/d8e4c6e92c004338bd1024c9e869e0d1/FLAG640e738bb [2021-11-23 03:29:24,826 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/data/0d6d8ad4e/d8e4c6e92c004338bd1024c9e869e0d1 [2021-11-23 03:29:24,829 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:29:24,832 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:29:24,837 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:29:24,837 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:29:24,842 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:29:24,843 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:29:24" (1/1) ... [2021-11-23 03:29:24,845 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d80ee2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:24, skipping insertion in model container [2021-11-23 03:29:24,846 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:29:24" (1/1) ... [2021-11-23 03:29:24,855 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:29:24,933 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:29:25,167 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_fa3f9082-c7e9-4084-ad7a-654f465d8073/sv-benchmarks/c/systemc/mem_slave_tlm.2.cil.c[646,659] [2021-11-23 03:29:25,308 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:29:25,334 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:29:25,353 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_fa3f9082-c7e9-4084-ad7a-654f465d8073/sv-benchmarks/c/systemc/mem_slave_tlm.2.cil.c[646,659] [2021-11-23 03:29:25,463 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:29:25,483 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:29:25,483 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:25 WrapperNode [2021-11-23 03:29:25,484 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:29:25,485 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:29:25,485 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:29:25,486 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:29:25,504 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:25" (1/1) ... [2021-11-23 03:29:25,545 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:25" (1/1) ... [2021-11-23 03:29:25,608 INFO L137 Inliner]: procedures = 19, calls = 18, calls flagged for inlining = 8, calls inlined = 8, statements flattened = 851 [2021-11-23 03:29:25,609 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:29:25,610 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:29:25,617 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:29:25,617 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:29:25,627 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:25" (1/1) ... [2021-11-23 03:29:25,627 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:25" (1/1) ... [2021-11-23 03:29:25,633 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:25" (1/1) ... [2021-11-23 03:29:25,633 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:25" (1/1) ... [2021-11-23 03:29:25,649 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:25" (1/1) ... [2021-11-23 03:29:25,669 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:25" (1/1) ... [2021-11-23 03:29:25,693 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:25" (1/1) ... [2021-11-23 03:29:25,699 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:29:25,700 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:29:25,703 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:29:25,703 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:29:25,705 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:25" (1/1) ... [2021-11-23 03:29:25,714 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:29:25,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:29:25,741 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:29:25,745 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:29:25,788 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:29:25,788 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:29:25,789 INFO L130 BoogieDeclarations]: Found specification of procedure error [2021-11-23 03:29:25,789 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2021-11-23 03:29:25,789 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:29:25,789 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:29:25,913 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:29:25,915 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:29:26,970 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:29:27,121 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:29:27,121 INFO L301 CfgBuilder]: Removed 13 assume(true) statements. [2021-11-23 03:29:27,128 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:29:27 BoogieIcfgContainer [2021-11-23 03:29:27,128 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:29:27,133 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:29:27,133 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:29:27,137 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:29:27,137 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:29:24" (1/3) ... [2021-11-23 03:29:27,138 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@13871748 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:29:27, skipping insertion in model container [2021-11-23 03:29:27,139 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:29:25" (2/3) ... [2021-11-23 03:29:27,139 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@13871748 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:29:27, skipping insertion in model container [2021-11-23 03:29:27,139 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:29:27" (3/3) ... [2021-11-23 03:29:27,142 INFO L111 eAbstractionObserver]: Analyzing ICFG mem_slave_tlm.2.cil.c [2021-11-23 03:29:27,150 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:29:27,150 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 03:29:27,223 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:29:27,230 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 [2021-11-23 03:29:27,231 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 03:29:27,267 INFO L276 IsEmpty]: Start isEmpty. Operand has 227 states, 219 states have (on average 1.7808219178082192) internal successors, (390), 225 states have internal predecessors, (390), 5 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-23 03:29:27,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-23 03:29:27,280 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:27,281 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] [2021-11-23 03:29:27,282 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:27,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:27,289 INFO L85 PathProgramCache]: Analyzing trace with hash -170303802, now seen corresponding path program 1 times [2021-11-23 03:29:27,304 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:27,305 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1193543391] [2021-11-23 03:29:27,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:27,306 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:27,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:27,517 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:27,518 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:27,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1193543391] [2021-11-23 03:29:27,519 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1193543391] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:27,519 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:27,520 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:29:27,522 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1027066966] [2021-11-23 03:29:27,523 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:27,528 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:29:27,528 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:27,564 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:29:27,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:29:27,569 INFO L87 Difference]: Start difference. First operand has 227 states, 219 states have (on average 1.7808219178082192) internal successors, (390), 225 states have internal predecessors, (390), 5 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 2 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:28,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:28,251 INFO L93 Difference]: Finished difference Result 612 states and 1070 transitions. [2021-11-23 03:29:28,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:29:28,254 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 2 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-23 03:29:28,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:28,292 INFO L225 Difference]: With dead ends: 612 [2021-11-23 03:29:28,293 INFO L226 Difference]: Without dead ends: 383 [2021-11-23 03:29:28,300 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 [2021-11-23 03:29:28,305 INFO L933 BasicCegarLoop]: 325 mSDtfsCounter, 218 mSDsluCounter, 235 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 542 SdHoareTripleChecker+Invalid, 328 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:28,307 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [218 Valid, 542 Invalid, 328 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 03:29:28,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2021-11-23 03:29:28,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 376. [2021-11-23 03:29:28,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 376 states, 370 states have (on average 1.5243243243243243) internal successors, (564), 374 states have internal predecessors, (564), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:28,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 376 states to 376 states and 569 transitions. [2021-11-23 03:29:28,441 INFO L78 Accepts]: Start accepts. Automaton has 376 states and 569 transitions. Word has length 24 [2021-11-23 03:29:28,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:28,442 INFO L470 AbstractCegarLoop]: Abstraction has 376 states and 569 transitions. [2021-11-23 03:29:28,442 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 2 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:28,443 INFO L276 IsEmpty]: Start isEmpty. Operand 376 states and 569 transitions. [2021-11-23 03:29:28,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-23 03:29:28,449 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:28,449 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] [2021-11-23 03:29:28,450 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 03:29:28,450 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:28,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:28,451 INFO L85 PathProgramCache]: Analyzing trace with hash -2086498198, now seen corresponding path program 1 times [2021-11-23 03:29:28,452 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:28,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [721181234] [2021-11-23 03:29:28,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:28,452 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:28,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:28,564 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:28,564 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:28,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [721181234] [2021-11-23 03:29:28,565 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [721181234] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:28,566 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:28,566 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:29:28,566 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947256259] [2021-11-23 03:29:28,566 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:28,568 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:29:28,569 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:28,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:29:28,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:29:28,571 INFO L87 Difference]: Start difference. First operand 376 states and 569 transitions. Second operand has 3 states, 3 states have (on average 11.0) internal successors, (33), 3 states have internal predecessors, (33), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:28,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:28,903 INFO L93 Difference]: Finished difference Result 973 states and 1500 transitions. [2021-11-23 03:29:28,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:29:28,904 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.0) internal successors, (33), 3 states have internal predecessors, (33), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-23 03:29:28,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:28,911 INFO L225 Difference]: With dead ends: 973 [2021-11-23 03:29:28,911 INFO L226 Difference]: Without dead ends: 607 [2021-11-23 03:29:28,922 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:29:28,926 INFO L933 BasicCegarLoop]: 464 mSDtfsCounter, 263 mSDsluCounter, 284 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 263 SdHoareTripleChecker+Valid, 725 SdHoareTripleChecker+Invalid, 175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:28,927 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [263 Valid, 725 Invalid, 175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:29:28,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 607 states. [2021-11-23 03:29:28,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 607 to 600. [2021-11-23 03:29:28,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 600 states, 594 states have (on average 1.5606060606060606) internal successors, (927), 598 states have internal predecessors, (927), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:28,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 600 states to 600 states and 932 transitions. [2021-11-23 03:29:28,975 INFO L78 Accepts]: Start accepts. Automaton has 600 states and 932 transitions. Word has length 34 [2021-11-23 03:29:28,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:28,976 INFO L470 AbstractCegarLoop]: Abstraction has 600 states and 932 transitions. [2021-11-23 03:29:28,976 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.0) internal successors, (33), 3 states have internal predecessors, (33), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:28,977 INFO L276 IsEmpty]: Start isEmpty. Operand 600 states and 932 transitions. [2021-11-23 03:29:28,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-23 03:29:28,979 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:28,980 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] [2021-11-23 03:29:28,980 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 03:29:28,980 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:28,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:28,981 INFO L85 PathProgramCache]: Analyzing trace with hash -41061517, now seen corresponding path program 1 times [2021-11-23 03:29:28,982 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:28,982 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [119781543] [2021-11-23 03:29:28,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:28,983 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:29,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:29,086 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:29,086 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:29,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [119781543] [2021-11-23 03:29:29,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [119781543] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:29,089 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:29,090 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:29:29,090 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844102698] [2021-11-23 03:29:29,090 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:29,093 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:29:29,093 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:29,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:29:29,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:29:29,095 INFO L87 Difference]: Start difference. First operand 600 states and 932 transitions. Second operand has 3 states, 3 states have (on average 11.333333333333334) internal successors, (34), 2 states have internal predecessors, (34), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:29,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:29,302 INFO L93 Difference]: Finished difference Result 1532 states and 2385 transitions. [2021-11-23 03:29:29,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:29:29,303 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.333333333333334) internal successors, (34), 2 states have internal predecessors, (34), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2021-11-23 03:29:29,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:29,313 INFO L225 Difference]: With dead ends: 1532 [2021-11-23 03:29:29,314 INFO L226 Difference]: Without dead ends: 942 [2021-11-23 03:29:29,316 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:29:29,335 INFO L933 BasicCegarLoop]: 321 mSDtfsCounter, 285 mSDsluCounter, 300 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 285 SdHoareTripleChecker+Valid, 589 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:29,336 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [285 Valid, 589 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:29:29,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 942 states. [2021-11-23 03:29:29,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 942 to 931. [2021-11-23 03:29:29,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 931 states, 925 states have (on average 1.5567567567567568) internal successors, (1440), 929 states have internal predecessors, (1440), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:29,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 931 states to 931 states and 1445 transitions. [2021-11-23 03:29:29,389 INFO L78 Accepts]: Start accepts. Automaton has 931 states and 1445 transitions. Word has length 35 [2021-11-23 03:29:29,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:29,390 INFO L470 AbstractCegarLoop]: Abstraction has 931 states and 1445 transitions. [2021-11-23 03:29:29,391 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.333333333333334) internal successors, (34), 2 states have internal predecessors, (34), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:29,391 INFO L276 IsEmpty]: Start isEmpty. Operand 931 states and 1445 transitions. [2021-11-23 03:29:29,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 03:29:29,393 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:29,394 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 03:29:29,394 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 03:29:29,394 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:29,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:29,395 INFO L85 PathProgramCache]: Analyzing trace with hash -1593582241, now seen corresponding path program 1 times [2021-11-23 03:29:29,395 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:29,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [954640102] [2021-11-23 03:29:29,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:29,396 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:29,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:29,466 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:29,466 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:29,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [954640102] [2021-11-23 03:29:29,467 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [954640102] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:29,467 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:29,467 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:29:29,468 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998086341] [2021-11-23 03:29:29,468 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:29,468 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:29:29,469 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:29,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:29:29,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:29:29,470 INFO L87 Difference]: Start difference. First operand 931 states and 1445 transitions. Second operand has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 2 states have internal predecessors, (40), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:29,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:29,675 INFO L93 Difference]: Finished difference Result 2496 states and 3885 transitions. [2021-11-23 03:29:29,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:29:29,676 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 2 states have internal predecessors, (40), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-23 03:29:29,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:29,689 INFO L225 Difference]: With dead ends: 2496 [2021-11-23 03:29:29,689 INFO L226 Difference]: Without dead ends: 1575 [2021-11-23 03:29:29,692 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 [2021-11-23 03:29:29,694 INFO L933 BasicCegarLoop]: 505 mSDtfsCounter, 335 mSDsluCounter, 280 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 335 SdHoareTripleChecker+Valid, 753 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:29,695 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [335 Valid, 753 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:29:29,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1575 states. [2021-11-23 03:29:29,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1575 to 1473. [2021-11-23 03:29:29,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1473 states, 1467 states have (on average 1.5460122699386503) internal successors, (2268), 1471 states have internal predecessors, (2268), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:29,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1473 states to 1473 states and 2273 transitions. [2021-11-23 03:29:29,776 INFO L78 Accepts]: Start accepts. Automaton has 1473 states and 2273 transitions. Word has length 41 [2021-11-23 03:29:29,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:29,776 INFO L470 AbstractCegarLoop]: Abstraction has 1473 states and 2273 transitions. [2021-11-23 03:29:29,777 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 2 states have internal predecessors, (40), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:29,777 INFO L276 IsEmpty]: Start isEmpty. Operand 1473 states and 2273 transitions. [2021-11-23 03:29:29,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-23 03:29:29,778 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:29,779 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] [2021-11-23 03:29:29,779 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 03:29:29,779 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:29,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:29,780 INFO L85 PathProgramCache]: Analyzing trace with hash 55165189, now seen corresponding path program 1 times [2021-11-23 03:29:29,780 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:29,780 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1757435657] [2021-11-23 03:29:29,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:29,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:29,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:29,842 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:29,842 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:29,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1757435657] [2021-11-23 03:29:29,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1757435657] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:29,843 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:29,843 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:29:29,843 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [465109339] [2021-11-23 03:29:29,843 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:29,844 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:29:29,844 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:29,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:29:29,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:29:29,845 INFO L87 Difference]: Start difference. First operand 1473 states and 2273 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:30,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:30,197 INFO L93 Difference]: Finished difference Result 4194 states and 6460 transitions. [2021-11-23 03:29:30,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:29:30,198 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-23 03:29:30,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:30,228 INFO L225 Difference]: With dead ends: 4194 [2021-11-23 03:29:30,228 INFO L226 Difference]: Without dead ends: 2729 [2021-11-23 03:29:30,232 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:29:30,234 INFO L933 BasicCegarLoop]: 307 mSDtfsCounter, 307 mSDsluCounter, 317 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 307 SdHoareTripleChecker+Valid, 599 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:30,235 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [307 Valid, 599 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:29:30,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2729 states. [2021-11-23 03:29:30,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2729 to 2676. [2021-11-23 03:29:30,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2676 states, 2670 states have (on average 1.5191011235955056) internal successors, (4056), 2674 states have internal predecessors, (4056), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:30,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2676 states to 2676 states and 4061 transitions. [2021-11-23 03:29:30,400 INFO L78 Accepts]: Start accepts. Automaton has 2676 states and 4061 transitions. Word has length 48 [2021-11-23 03:29:30,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:30,401 INFO L470 AbstractCegarLoop]: Abstraction has 2676 states and 4061 transitions. [2021-11-23 03:29:30,401 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:30,401 INFO L276 IsEmpty]: Start isEmpty. Operand 2676 states and 4061 transitions. [2021-11-23 03:29:30,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-23 03:29:30,403 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:30,403 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] [2021-11-23 03:29:30,403 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 03:29:30,403 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:30,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:30,404 INFO L85 PathProgramCache]: Analyzing trace with hash -623947105, now seen corresponding path program 1 times [2021-11-23 03:29:30,404 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:30,405 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [330417369] [2021-11-23 03:29:30,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:30,405 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:30,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:30,462 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:30,463 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:30,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [330417369] [2021-11-23 03:29:30,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [330417369] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:30,463 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:30,463 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:29:30,464 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923960707] [2021-11-23 03:29:30,464 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:30,464 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:29:30,465 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:30,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:29:30,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:29:30,465 INFO L87 Difference]: Start difference. First operand 2676 states and 4061 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 2 states have internal predecessors, (47), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:30,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:30,813 INFO L93 Difference]: Finished difference Result 6273 states and 9486 transitions. [2021-11-23 03:29:30,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:29:30,813 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 2 states have internal predecessors, (47), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-23 03:29:30,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:30,841 INFO L225 Difference]: With dead ends: 6273 [2021-11-23 03:29:30,841 INFO L226 Difference]: Without dead ends: 3606 [2021-11-23 03:29:30,846 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 [2021-11-23 03:29:30,848 INFO L933 BasicCegarLoop]: 319 mSDtfsCounter, 294 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 294 SdHoareTripleChecker+Valid, 512 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:30,849 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [294 Valid, 512 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:29:30,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3606 states. [2021-11-23 03:29:31,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3606 to 3458. [2021-11-23 03:29:31,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3458 states, 3452 states have (on average 1.5011587485515643) internal successors, (5182), 3456 states have internal predecessors, (5182), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:31,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3458 states to 3458 states and 5187 transitions. [2021-11-23 03:29:31,086 INFO L78 Accepts]: Start accepts. Automaton has 3458 states and 5187 transitions. Word has length 48 [2021-11-23 03:29:31,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:31,087 INFO L470 AbstractCegarLoop]: Abstraction has 3458 states and 5187 transitions. [2021-11-23 03:29:31,087 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 2 states have internal predecessors, (47), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:31,088 INFO L276 IsEmpty]: Start isEmpty. Operand 3458 states and 5187 transitions. [2021-11-23 03:29:31,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-23 03:29:31,091 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:31,092 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] [2021-11-23 03:29:31,092 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 03:29:31,092 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:31,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:31,093 INFO L85 PathProgramCache]: Analyzing trace with hash -2089428736, now seen corresponding path program 1 times [2021-11-23 03:29:31,094 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:31,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1694153441] [2021-11-23 03:29:31,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:31,094 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:31,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:31,212 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:31,212 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:31,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1694153441] [2021-11-23 03:29:31,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1694153441] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:31,213 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:31,213 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:29:31,214 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739155908] [2021-11-23 03:29:31,214 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:31,215 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:29:31,215 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:31,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:29:31,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:29:31,216 INFO L87 Difference]: Start difference. First operand 3458 states and 5187 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:31,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:31,846 INFO L93 Difference]: Finished difference Result 8352 states and 12575 transitions. [2021-11-23 03:29:31,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:29:31,847 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2021-11-23 03:29:31,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:31,884 INFO L225 Difference]: With dead ends: 8352 [2021-11-23 03:29:31,884 INFO L226 Difference]: Without dead ends: 4903 [2021-11-23 03:29:31,892 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:29:31,894 INFO L933 BasicCegarLoop]: 413 mSDtfsCounter, 206 mSDsluCounter, 217 mSDsCounter, 0 mSdLazyCounter, 252 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 612 SdHoareTripleChecker+Invalid, 310 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:31,894 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [206 Valid, 612 Invalid, 310 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 252 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:29:31,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4903 states. [2021-11-23 03:29:32,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4903 to 4820. [2021-11-23 03:29:32,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4820 states, 4814 states have (on average 1.4275031159119236) internal successors, (6872), 4818 states have internal predecessors, (6872), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:32,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4820 states to 4820 states and 6877 transitions. [2021-11-23 03:29:32,223 INFO L78 Accepts]: Start accepts. Automaton has 4820 states and 6877 transitions. Word has length 53 [2021-11-23 03:29:32,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:32,224 INFO L470 AbstractCegarLoop]: Abstraction has 4820 states and 6877 transitions. [2021-11-23 03:29:32,224 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:32,224 INFO L276 IsEmpty]: Start isEmpty. Operand 4820 states and 6877 transitions. [2021-11-23 03:29:32,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-23 03:29:32,227 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:32,227 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] [2021-11-23 03:29:32,227 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 03:29:32,228 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:32,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:32,228 INFO L85 PathProgramCache]: Analyzing trace with hash 606360492, now seen corresponding path program 1 times [2021-11-23 03:29:32,229 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:32,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [480029417] [2021-11-23 03:29:32,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:32,229 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:32,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:32,283 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:32,283 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:32,284 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [480029417] [2021-11-23 03:29:32,284 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [480029417] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:32,284 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:32,284 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:29:32,285 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117917119] [2021-11-23 03:29:32,285 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:32,285 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:29:32,285 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:32,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:29:32,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:29:32,286 INFO L87 Difference]: Start difference. First operand 4820 states and 6877 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:32,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:32,675 INFO L93 Difference]: Finished difference Result 9496 states and 13576 transitions. [2021-11-23 03:29:32,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:29:32,676 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-23 03:29:32,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:32,716 INFO L225 Difference]: With dead ends: 9496 [2021-11-23 03:29:32,716 INFO L226 Difference]: Without dead ends: 4685 [2021-11-23 03:29:32,727 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 [2021-11-23 03:29:32,728 INFO L933 BasicCegarLoop]: 304 mSDtfsCounter, 279 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 279 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:32,729 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [279 Valid, 326 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:29:32,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4685 states. [2021-11-23 03:29:33,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4685 to 4685. [2021-11-23 03:29:33,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4685 states, 4679 states have (on average 1.4176106005556743) internal successors, (6633), 4683 states have internal predecessors, (6633), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:33,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4685 states to 4685 states and 6638 transitions. [2021-11-23 03:29:33,064 INFO L78 Accepts]: Start accepts. Automaton has 4685 states and 6638 transitions. Word has length 55 [2021-11-23 03:29:33,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:33,066 INFO L470 AbstractCegarLoop]: Abstraction has 4685 states and 6638 transitions. [2021-11-23 03:29:33,067 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:33,067 INFO L276 IsEmpty]: Start isEmpty. Operand 4685 states and 6638 transitions. [2021-11-23 03:29:33,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-23 03:29:33,070 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:33,071 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] [2021-11-23 03:29:33,071 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 03:29:33,072 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:33,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:33,072 INFO L85 PathProgramCache]: Analyzing trace with hash 1891634833, now seen corresponding path program 1 times [2021-11-23 03:29:33,073 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:33,074 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1170293879] [2021-11-23 03:29:33,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:33,074 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:33,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:33,153 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:33,154 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:33,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1170293879] [2021-11-23 03:29:33,154 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1170293879] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:33,155 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:33,155 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:29:33,155 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826345554] [2021-11-23 03:29:33,155 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:33,156 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:29:33,156 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:33,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:29:33,157 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:29:33,157 INFO L87 Difference]: Start difference. First operand 4685 states and 6638 transitions. Second operand has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:33,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:33,574 INFO L93 Difference]: Finished difference Result 9787 states and 14040 transitions. [2021-11-23 03:29:33,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:29:33,575 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-23 03:29:33,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:33,610 INFO L225 Difference]: With dead ends: 9787 [2021-11-23 03:29:33,611 INFO L226 Difference]: Without dead ends: 5111 [2021-11-23 03:29:33,620 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:29:33,621 INFO L933 BasicCegarLoop]: 430 mSDtfsCounter, 256 mSDsluCounter, 332 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 735 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:33,621 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [256 Valid, 735 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:29:33,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5111 states. [2021-11-23 03:29:33,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5111 to 3597. [2021-11-23 03:29:33,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3597 states, 3591 states have (on average 1.4374825953773323) internal successors, (5162), 3595 states have internal predecessors, (5162), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:33,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3597 states to 3597 states and 5167 transitions. [2021-11-23 03:29:33,862 INFO L78 Accepts]: Start accepts. Automaton has 3597 states and 5167 transitions. Word has length 56 [2021-11-23 03:29:33,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:33,863 INFO L470 AbstractCegarLoop]: Abstraction has 3597 states and 5167 transitions. [2021-11-23 03:29:33,863 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:33,863 INFO L276 IsEmpty]: Start isEmpty. Operand 3597 states and 5167 transitions. [2021-11-23 03:29:33,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-23 03:29:33,865 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:33,865 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] [2021-11-23 03:29:33,865 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 03:29:33,865 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:33,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:33,866 INFO L85 PathProgramCache]: Analyzing trace with hash 1317711000, now seen corresponding path program 1 times [2021-11-23 03:29:33,866 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:33,866 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1019901938] [2021-11-23 03:29:33,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:33,867 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:33,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:33,961 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:33,961 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:33,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1019901938] [2021-11-23 03:29:33,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1019901938] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:33,964 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:33,964 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 03:29:33,965 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637034904] [2021-11-23 03:29:33,965 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:33,965 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:29:33,966 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:33,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:29:33,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:29:33,967 INFO L87 Difference]: Start difference. First operand 3597 states and 5167 transitions. Second operand has 7 states, 7 states have (on average 8.142857142857142) internal successors, (57), 6 states have internal predecessors, (57), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:35,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:35,607 INFO L93 Difference]: Finished difference Result 16510 states and 23606 transitions. [2021-11-23 03:29:35,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 03:29:35,608 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 8.142857142857142) internal successors, (57), 6 states have internal predecessors, (57), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-23 03:29:35,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:35,670 INFO L225 Difference]: With dead ends: 16510 [2021-11-23 03:29:35,670 INFO L226 Difference]: Without dead ends: 13010 [2021-11-23 03:29:35,681 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=237, Unknown=0, NotChecked=0, Total=342 [2021-11-23 03:29:35,683 INFO L933 BasicCegarLoop]: 1176 mSDtfsCounter, 2038 mSDsluCounter, 4270 mSDsCounter, 0 mSdLazyCounter, 808 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2038 SdHoareTripleChecker+Valid, 5014 SdHoareTripleChecker+Invalid, 835 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 808 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:35,684 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2038 Valid, 5014 Invalid, 835 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 808 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 03:29:35,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13010 states. [2021-11-23 03:29:36,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13010 to 4371. [2021-11-23 03:29:36,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4371 states, 4365 states have (on average 1.43184421534937) internal successors, (6250), 4369 states have internal predecessors, (6250), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:36,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4371 states to 4371 states and 6255 transitions. [2021-11-23 03:29:36,214 INFO L78 Accepts]: Start accepts. Automaton has 4371 states and 6255 transitions. Word has length 58 [2021-11-23 03:29:36,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:36,215 INFO L470 AbstractCegarLoop]: Abstraction has 4371 states and 6255 transitions. [2021-11-23 03:29:36,216 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 8.142857142857142) internal successors, (57), 6 states have internal predecessors, (57), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:36,217 INFO L276 IsEmpty]: Start isEmpty. Operand 4371 states and 6255 transitions. [2021-11-23 03:29:36,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-23 03:29:36,219 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:36,219 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] [2021-11-23 03:29:36,220 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-23 03:29:36,220 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:36,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:36,221 INFO L85 PathProgramCache]: Analyzing trace with hash -1599891541, now seen corresponding path program 1 times [2021-11-23 03:29:36,221 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:36,221 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [255616191] [2021-11-23 03:29:36,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:36,222 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:36,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:36,325 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:36,326 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:36,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [255616191] [2021-11-23 03:29:36,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [255616191] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:36,326 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:36,327 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 03:29:36,327 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631044558] [2021-11-23 03:29:36,327 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:36,328 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:29:36,328 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:36,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:29:36,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:29:36,330 INFO L87 Difference]: Start difference. First operand 4371 states and 6255 transitions. Second operand has 7 states, 7 states have (on average 8.285714285714286) internal successors, (58), 7 states have internal predecessors, (58), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:39,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:39,275 INFO L93 Difference]: Finished difference Result 29236 states and 41750 transitions. [2021-11-23 03:29:39,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-23 03:29:39,277 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 8.285714285714286) internal successors, (58), 7 states have internal predecessors, (58), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-11-23 03:29:39,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:39,361 INFO L225 Difference]: With dead ends: 29236 [2021-11-23 03:29:39,362 INFO L226 Difference]: Without dead ends: 24962 [2021-11-23 03:29:39,378 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=658, Unknown=0, NotChecked=0, Total=870 [2021-11-23 03:29:39,379 INFO L933 BasicCegarLoop]: 1400 mSDtfsCounter, 3179 mSDsluCounter, 5559 mSDsCounter, 0 mSdLazyCounter, 899 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3179 SdHoareTripleChecker+Valid, 6480 SdHoareTripleChecker+Invalid, 910 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 899 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:39,380 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3179 Valid, 6480 Invalid, 910 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 899 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 03:29:39,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24962 states. [2021-11-23 03:29:40,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24962 to 4655. [2021-11-23 03:29:40,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4655 states, 4649 states have (on average 1.4226715422671543) internal successors, (6614), 4653 states have internal predecessors, (6614), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:40,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4655 states to 4655 states and 6619 transitions. [2021-11-23 03:29:40,142 INFO L78 Accepts]: Start accepts. Automaton has 4655 states and 6619 transitions. Word has length 59 [2021-11-23 03:29:40,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:40,142 INFO L470 AbstractCegarLoop]: Abstraction has 4655 states and 6619 transitions. [2021-11-23 03:29:40,143 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 8.285714285714286) internal successors, (58), 7 states have internal predecessors, (58), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:40,143 INFO L276 IsEmpty]: Start isEmpty. Operand 4655 states and 6619 transitions. [2021-11-23 03:29:40,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-23 03:29:40,146 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:40,146 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 03:29:40,146 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-23 03:29:40,147 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:40,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:40,148 INFO L85 PathProgramCache]: Analyzing trace with hash 2132859829, now seen corresponding path program 1 times [2021-11-23 03:29:40,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:40,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1597076578] [2021-11-23 03:29:40,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:40,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:40,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:40,181 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:40,181 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:40,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1597076578] [2021-11-23 03:29:40,182 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1597076578] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:40,182 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:40,182 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:29:40,183 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495875876] [2021-11-23 03:29:40,183 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:40,183 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:29:40,184 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:40,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:29:40,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:29:40,185 INFO L87 Difference]: Start difference. First operand 4655 states and 6619 transitions. Second operand has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 2 states have internal predecessors, (71), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:40,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:40,896 INFO L93 Difference]: Finished difference Result 9803 states and 13895 transitions. [2021-11-23 03:29:40,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:29:40,897 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 2 states have internal predecessors, (71), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 72 [2021-11-23 03:29:40,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:40,913 INFO L225 Difference]: With dead ends: 9803 [2021-11-23 03:29:40,914 INFO L226 Difference]: Without dead ends: 5172 [2021-11-23 03:29:40,923 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 [2021-11-23 03:29:40,925 INFO L933 BasicCegarLoop]: 332 mSDtfsCounter, 122 mSDsluCounter, 309 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 616 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:40,925 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [122 Valid, 616 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:29:40,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5172 states. [2021-11-23 03:29:41,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5172 to 4706. [2021-11-23 03:29:41,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4706 states, 4700 states have (on average 1.4195744680851063) internal successors, (6672), 4704 states have internal predecessors, (6672), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:41,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4706 states to 4706 states and 6677 transitions. [2021-11-23 03:29:41,281 INFO L78 Accepts]: Start accepts. Automaton has 4706 states and 6677 transitions. Word has length 72 [2021-11-23 03:29:41,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:41,281 INFO L470 AbstractCegarLoop]: Abstraction has 4706 states and 6677 transitions. [2021-11-23 03:29:41,281 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 2 states have internal predecessors, (71), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:41,282 INFO L276 IsEmpty]: Start isEmpty. Operand 4706 states and 6677 transitions. [2021-11-23 03:29:41,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 03:29:41,284 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:41,285 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:41,285 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-23 03:29:41,285 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:41,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:41,286 INFO L85 PathProgramCache]: Analyzing trace with hash -1979018828, now seen corresponding path program 1 times [2021-11-23 03:29:41,286 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:41,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1405903987] [2021-11-23 03:29:41,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:41,287 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:41,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:41,339 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:41,339 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:41,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1405903987] [2021-11-23 03:29:41,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1405903987] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:41,341 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:41,341 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:29:41,341 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565807916] [2021-11-23 03:29:41,341 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:41,342 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:29:41,342 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:41,343 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:29:41,343 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:29:41,344 INFO L87 Difference]: Start difference. First operand 4706 states and 6677 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:41,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:41,875 INFO L93 Difference]: Finished difference Result 10451 states and 14874 transitions. [2021-11-23 03:29:41,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:29:41,876 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2021-11-23 03:29:41,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:41,890 INFO L225 Difference]: With dead ends: 10451 [2021-11-23 03:29:41,890 INFO L226 Difference]: Without dead ends: 5822 [2021-11-23 03:29:41,898 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:29:41,899 INFO L933 BasicCegarLoop]: 407 mSDtfsCounter, 147 mSDsluCounter, 324 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 703 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:41,900 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [147 Valid, 703 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:29:41,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5822 states. [2021-11-23 03:29:42,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5822 to 4975. [2021-11-23 03:29:42,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4975 states, 4969 states have (on average 1.4155765747635338) internal successors, (7034), 4973 states have internal predecessors, (7034), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:42,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4975 states to 4975 states and 7039 transitions. [2021-11-23 03:29:42,326 INFO L78 Accepts]: Start accepts. Automaton has 4975 states and 7039 transitions. Word has length 83 [2021-11-23 03:29:42,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:42,327 INFO L470 AbstractCegarLoop]: Abstraction has 4975 states and 7039 transitions. [2021-11-23 03:29:42,327 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:42,327 INFO L276 IsEmpty]: Start isEmpty. Operand 4975 states and 7039 transitions. [2021-11-23 03:29:42,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-23 03:29:42,330 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:42,330 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 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] [2021-11-23 03:29:42,330 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-23 03:29:42,331 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:42,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:42,331 INFO L85 PathProgramCache]: Analyzing trace with hash -1975521765, now seen corresponding path program 1 times [2021-11-23 03:29:42,332 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:42,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [13371871] [2021-11-23 03:29:42,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:42,332 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:42,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:42,373 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:42,374 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:42,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [13371871] [2021-11-23 03:29:42,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [13371871] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:42,374 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:42,374 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:29:42,375 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822392071] [2021-11-23 03:29:42,375 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:42,375 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:29:42,376 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:42,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:29:42,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:29:42,377 INFO L87 Difference]: Start difference. First operand 4975 states and 7039 transitions. Second operand has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:42,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:42,667 INFO L93 Difference]: Finished difference Result 7303 states and 10408 transitions. [2021-11-23 03:29:42,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:29:42,667 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 89 [2021-11-23 03:29:42,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:42,673 INFO L225 Difference]: With dead ends: 7303 [2021-11-23 03:29:42,674 INFO L226 Difference]: Without dead ends: 2296 [2021-11-23 03:29:42,682 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:29:42,683 INFO L933 BasicCegarLoop]: 369 mSDtfsCounter, 300 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 300 SdHoareTripleChecker+Valid, 448 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:42,683 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [300 Valid, 448 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:29:42,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2296 states. [2021-11-23 03:29:42,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2296 to 2260. [2021-11-23 03:29:42,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2260 states, 2254 states have (on average 1.3673469387755102) internal successors, (3082), 2258 states have internal predecessors, (3082), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:42,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2260 states to 2260 states and 3087 transitions. [2021-11-23 03:29:42,876 INFO L78 Accepts]: Start accepts. Automaton has 2260 states and 3087 transitions. Word has length 89 [2021-11-23 03:29:42,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:42,877 INFO L470 AbstractCegarLoop]: Abstraction has 2260 states and 3087 transitions. [2021-11-23 03:29:42,877 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:42,878 INFO L276 IsEmpty]: Start isEmpty. Operand 2260 states and 3087 transitions. [2021-11-23 03:29:42,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-23 03:29:42,879 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:42,880 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] [2021-11-23 03:29:42,880 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-23 03:29:42,880 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:42,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:42,881 INFO L85 PathProgramCache]: Analyzing trace with hash 1487086863, now seen corresponding path program 1 times [2021-11-23 03:29:42,881 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:42,881 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [234920766] [2021-11-23 03:29:42,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:42,882 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:42,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:42,930 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:42,930 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:42,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [234920766] [2021-11-23 03:29:42,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [234920766] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:42,931 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:29:42,931 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 03:29:42,931 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736313655] [2021-11-23 03:29:42,932 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:42,932 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:29:42,932 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:42,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:29:42,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:29:42,933 INFO L87 Difference]: Start difference. First operand 2260 states and 3087 transitions. Second operand has 5 states, 5 states have (on average 18.4) internal successors, (92), 5 states have internal predecessors, (92), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:43,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:43,891 INFO L93 Difference]: Finished difference Result 8662 states and 11908 transitions. [2021-11-23 03:29:43,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 03:29:43,892 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 18.4) internal successors, (92), 5 states have internal predecessors, (92), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 93 [2021-11-23 03:29:43,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:43,908 INFO L225 Difference]: With dead ends: 8662 [2021-11-23 03:29:43,909 INFO L226 Difference]: Without dead ends: 6531 [2021-11-23 03:29:43,916 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:29:43,917 INFO L933 BasicCegarLoop]: 839 mSDtfsCounter, 1389 mSDsluCounter, 1997 mSDsCounter, 0 mSdLazyCounter, 359 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1389 SdHoareTripleChecker+Valid, 2646 SdHoareTripleChecker+Invalid, 366 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 359 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:43,917 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1389 Valid, 2646 Invalid, 366 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 359 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:29:43,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6531 states. [2021-11-23 03:29:44,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6531 to 2262. [2021-11-23 03:29:44,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2262 states, 2256 states have (on average 1.3643617021276595) internal successors, (3078), 2260 states have internal predecessors, (3078), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:44,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2262 states to 2262 states and 3083 transitions. [2021-11-23 03:29:44,184 INFO L78 Accepts]: Start accepts. Automaton has 2262 states and 3083 transitions. Word has length 93 [2021-11-23 03:29:44,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:44,184 INFO L470 AbstractCegarLoop]: Abstraction has 2262 states and 3083 transitions. [2021-11-23 03:29:44,184 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 18.4) internal successors, (92), 5 states have internal predecessors, (92), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:44,185 INFO L276 IsEmpty]: Start isEmpty. Operand 2262 states and 3083 transitions. [2021-11-23 03:29:44,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-23 03:29:44,186 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:44,186 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] [2021-11-23 03:29:44,187 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-23 03:29:44,187 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:44,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:44,188 INFO L85 PathProgramCache]: Analyzing trace with hash -58646358, now seen corresponding path program 1 times [2021-11-23 03:29:44,188 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:44,188 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1417988765] [2021-11-23 03:29:44,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:44,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:44,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:44,260 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:44,260 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:44,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1417988765] [2021-11-23 03:29:44,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1417988765] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:29:44,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2070298345] [2021-11-23 03:29:44,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:44,261 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:29:44,262 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:29:44,263 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:29:44,284 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:29:44,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:44,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 360 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:29:44,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:44,648 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 03:29:44,649 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:29:44,649 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2070298345] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:44,649 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:29:44,650 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2021-11-23 03:29:44,650 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088153354] [2021-11-23 03:29:44,650 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:44,651 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:29:44,651 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:44,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:29:44,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:29:44,652 INFO L87 Difference]: Start difference. First operand 2262 states and 3083 transitions. Second operand has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:45,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:45,135 INFO L93 Difference]: Finished difference Result 2283 states and 3102 transitions. [2021-11-23 03:29:45,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:29:45,136 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 95 [2021-11-23 03:29:45,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:45,140 INFO L225 Difference]: With dead ends: 2283 [2021-11-23 03:29:45,141 INFO L226 Difference]: Without dead ends: 2279 [2021-11-23 03:29:45,142 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:29:45,143 INFO L933 BasicCegarLoop]: 331 mSDtfsCounter, 201 mSDsluCounter, 328 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 201 SdHoareTripleChecker+Valid, 623 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:45,143 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [201 Valid, 623 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:29:45,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2279 states. [2021-11-23 03:29:45,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2279 to 2262. [2021-11-23 03:29:45,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2262 states, 2256 states have (on average 1.3585992907801419) internal successors, (3065), 2260 states have internal predecessors, (3065), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:45,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2262 states to 2262 states and 3070 transitions. [2021-11-23 03:29:45,452 INFO L78 Accepts]: Start accepts. Automaton has 2262 states and 3070 transitions. Word has length 95 [2021-11-23 03:29:45,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:45,453 INFO L470 AbstractCegarLoop]: Abstraction has 2262 states and 3070 transitions. [2021-11-23 03:29:45,453 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:45,453 INFO L276 IsEmpty]: Start isEmpty. Operand 2262 states and 3070 transitions. [2021-11-23 03:29:45,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-23 03:29:45,457 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:45,457 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:45,508 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 03:29:45,680 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-23 03:29:45,681 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:45,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:45,681 INFO L85 PathProgramCache]: Analyzing trace with hash 1696165525, now seen corresponding path program 1 times [2021-11-23 03:29:45,682 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:45,682 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1190650898] [2021-11-23 03:29:45,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:45,682 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:45,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:45,801 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:45,802 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:45,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1190650898] [2021-11-23 03:29:45,802 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1190650898] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:29:45,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [742553835] [2021-11-23 03:29:45,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:45,803 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:29:45,803 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:29:45,805 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:29:45,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:29:45,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:45,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 508 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:29:45,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:46,376 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 03:29:46,376 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:29:46,376 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [742553835] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:46,377 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:29:46,377 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2021-11-23 03:29:46,377 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [175667996] [2021-11-23 03:29:46,378 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:46,379 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:29:46,379 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:46,380 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:29:46,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:29:46,380 INFO L87 Difference]: Start difference. First operand 2262 states and 3070 transitions. Second operand has 3 states, 3 states have (on average 47.333333333333336) internal successors, (142), 3 states have internal predecessors, (142), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:46,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:46,764 INFO L93 Difference]: Finished difference Result 4373 states and 5972 transitions. [2021-11-23 03:29:46,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:29:46,765 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 47.333333333333336) internal successors, (142), 3 states have internal predecessors, (142), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 146 [2021-11-23 03:29:46,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:46,770 INFO L225 Difference]: With dead ends: 4373 [2021-11-23 03:29:46,770 INFO L226 Difference]: Without dead ends: 2262 [2021-11-23 03:29:46,775 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:29:46,776 INFO L933 BasicCegarLoop]: 292 mSDtfsCounter, 230 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 230 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:46,777 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [230 Valid, 333 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:29:46,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2262 states. [2021-11-23 03:29:47,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2262 to 2262. [2021-11-23 03:29:47,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2262 states, 2256 states have (on average 1.3275709219858156) internal successors, (2995), 2260 states have internal predecessors, (2995), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:47,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2262 states to 2262 states and 3000 transitions. [2021-11-23 03:29:47,031 INFO L78 Accepts]: Start accepts. Automaton has 2262 states and 3000 transitions. Word has length 146 [2021-11-23 03:29:47,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:47,032 INFO L470 AbstractCegarLoop]: Abstraction has 2262 states and 3000 transitions. [2021-11-23 03:29:47,032 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 47.333333333333336) internal successors, (142), 3 states have internal predecessors, (142), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:47,032 INFO L276 IsEmpty]: Start isEmpty. Operand 2262 states and 3000 transitions. [2021-11-23 03:29:47,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-23 03:29:47,037 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:47,037 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1] [2021-11-23 03:29:47,082 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:29:47,264 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-23 03:29:47,265 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:47,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:47,265 INFO L85 PathProgramCache]: Analyzing trace with hash -602640617, now seen corresponding path program 1 times [2021-11-23 03:29:47,265 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:47,266 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1431425715] [2021-11-23 03:29:47,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:47,266 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:47,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:47,358 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 19 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 03:29:47,358 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:47,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1431425715] [2021-11-23 03:29:47,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1431425715] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:29:47,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [256141241] [2021-11-23 03:29:47,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:47,360 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:29:47,360 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:29:47,361 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:29:47,381 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:29:47,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:47,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 502 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:29:47,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:47,840 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 03:29:47,840 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:29:47,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [256141241] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:47,841 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:29:47,841 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 03:29:47,841 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1619740587] [2021-11-23 03:29:47,842 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:47,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:29:47,842 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:47,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:29:47,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:29:47,844 INFO L87 Difference]: Start difference. First operand 2262 states and 3000 transitions. Second operand has 3 states, 3 states have (on average 47.0) internal successors, (141), 3 states have internal predecessors, (141), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:48,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:48,226 INFO L93 Difference]: Finished difference Result 4373 states and 5832 transitions. [2021-11-23 03:29:48,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:29:48,227 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 47.0) internal successors, (141), 3 states have internal predecessors, (141), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 149 [2021-11-23 03:29:48,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:48,231 INFO L225 Difference]: With dead ends: 4373 [2021-11-23 03:29:48,231 INFO L226 Difference]: Without dead ends: 2262 [2021-11-23 03:29:48,236 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:29:48,237 INFO L933 BasicCegarLoop]: 271 mSDtfsCounter, 240 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 240 SdHoareTripleChecker+Valid, 305 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:48,237 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [240 Valid, 305 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:29:48,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2262 states. [2021-11-23 03:29:48,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2262 to 2262. [2021-11-23 03:29:48,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2262 states, 2256 states have (on average 1.2965425531914894) internal successors, (2925), 2260 states have internal predecessors, (2925), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:48,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2262 states to 2262 states and 2930 transitions. [2021-11-23 03:29:48,602 INFO L78 Accepts]: Start accepts. Automaton has 2262 states and 2930 transitions. Word has length 149 [2021-11-23 03:29:48,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:48,602 INFO L470 AbstractCegarLoop]: Abstraction has 2262 states and 2930 transitions. [2021-11-23 03:29:48,603 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 47.0) internal successors, (141), 3 states have internal predecessors, (141), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:48,603 INFO L276 IsEmpty]: Start isEmpty. Operand 2262 states and 2930 transitions. [2021-11-23 03:29:48,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2021-11-23 03:29:48,606 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:48,607 INFO L514 BasicCegarLoop]: trace histogram [3, 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] [2021-11-23 03:29:48,653 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:29:48,820 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-23 03:29:48,821 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:48,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:48,821 INFO L85 PathProgramCache]: Analyzing trace with hash 1811874136, now seen corresponding path program 1 times [2021-11-23 03:29:48,821 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:48,822 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2106986963] [2021-11-23 03:29:48,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:48,822 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:48,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:48,916 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 20 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 03:29:48,916 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:48,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2106986963] [2021-11-23 03:29:48,917 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2106986963] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:29:48,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1174162189] [2021-11-23 03:29:48,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:48,918 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:29:48,918 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:29:48,919 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:29:48,940 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:29:49,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:49,078 INFO L263 TraceCheckSpWp]: Trace formula consists of 503 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:29:49,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:49,356 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:29:49,356 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:29:49,356 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1174162189] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:49,356 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:29:49,357 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 03:29:49,357 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694830250] [2021-11-23 03:29:49,357 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:49,358 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:29:49,358 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:29:49,358 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:29:49,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:29:49,359 INFO L87 Difference]: Start difference. First operand 2262 states and 2930 transitions. Second operand has 3 states, 3 states have (on average 47.0) internal successors, (141), 3 states have internal predecessors, (141), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:49,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:49,985 INFO L93 Difference]: Finished difference Result 5024 states and 6632 transitions. [2021-11-23 03:29:49,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:29:49,986 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 47.0) internal successors, (141), 3 states have internal predecessors, (141), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 150 [2021-11-23 03:29:49,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:49,989 INFO L225 Difference]: With dead ends: 5024 [2021-11-23 03:29:49,990 INFO L226 Difference]: Without dead ends: 2913 [2021-11-23 03:29:49,993 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:29:49,994 INFO L933 BasicCegarLoop]: 354 mSDtfsCounter, 173 mSDsluCounter, 198 mSDsCounter, 0 mSdLazyCounter, 255 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 173 SdHoareTripleChecker+Valid, 536 SdHoareTripleChecker+Invalid, 306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 255 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:49,994 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [173 Valid, 536 Invalid, 306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 255 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:29:49,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2913 states. [2021-11-23 03:29:50,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2913 to 2750. [2021-11-23 03:29:50,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2750 states, 2744 states have (on average 1.2744169096209912) internal successors, (3497), 2748 states have internal predecessors, (3497), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:50,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2750 states to 2750 states and 3502 transitions. [2021-11-23 03:29:50,311 INFO L78 Accepts]: Start accepts. Automaton has 2750 states and 3502 transitions. Word has length 150 [2021-11-23 03:29:50,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:50,311 INFO L470 AbstractCegarLoop]: Abstraction has 2750 states and 3502 transitions. [2021-11-23 03:29:50,311 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 47.0) internal successors, (141), 3 states have internal predecessors, (141), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:50,312 INFO L276 IsEmpty]: Start isEmpty. Operand 2750 states and 3502 transitions. [2021-11-23 03:29:50,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-11-23 03:29:50,315 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:50,315 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:50,358 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 03:29:50,528 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:29:50,529 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:50,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:50,529 INFO L85 PathProgramCache]: Analyzing trace with hash 79573088, now seen corresponding path program 1 times [2021-11-23 03:29:50,529 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:29:50,529 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [215116793] [2021-11-23 03:29:50,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:50,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:29:50,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:50,759 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 5 proven. 42 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 03:29:50,759 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:29:50,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [215116793] [2021-11-23 03:29:50,760 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [215116793] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:29:50,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [577773109] [2021-11-23 03:29:50,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:50,761 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:29:50,761 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:29:50,762 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:29:50,791 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 03:29:50,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:50,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 507 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 03:29:50,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:51,418 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 5 proven. 42 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 03:29:51,418 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:51,836 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 5 proven. 42 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 03:29:51,837 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [577773109] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:29:51,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1068926794] [2021-11-23 03:29:51,873 INFO L159 IcfgInterpreter]: Started Sifa with 105 locations of interest [2021-11-23 03:29:51,873 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:29:51,880 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:29:51,887 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:29:51,887 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:30:43,939 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:31:38,638 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1068926794] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:31:38,638 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:31:38,638 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [9, 9, 9] total 58 [2021-11-23 03:31:38,639 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974612535] [2021-11-23 03:31:38,639 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:31:38,640 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-23 03:31:38,640 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:31:38,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-23 03:31:38,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=3095, Unknown=0, NotChecked=0, Total=3306 [2021-11-23 03:31:38,642 INFO L87 Difference]: Start difference. First operand 2750 states and 3502 transitions. Second operand has 50 states, 50 states have (on average 2.22) internal successors, (111), 49 states have internal predecessors, (111), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:32:03,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:32:03,826 INFO L93 Difference]: Finished difference Result 5663 states and 7196 transitions. [2021-11-23 03:32:03,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-23 03:32:03,827 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.22) internal successors, (111), 49 states have internal predecessors, (111), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 152 [2021-11-23 03:32:03,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:32:03,830 INFO L225 Difference]: With dead ends: 5663 [2021-11-23 03:32:03,830 INFO L226 Difference]: Without dead ends: 2906 [2021-11-23 03:32:03,839 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 480 GetRequests, 375 SyntacticMatches, 33 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2295 ImplicationChecksByTransitivity, 68.0s TimeCoverageRelationStatistics Valid=354, Invalid=5048, Unknown=0, NotChecked=0, Total=5402 [2021-11-23 03:32:03,840 INFO L933 BasicCegarLoop]: 222 mSDtfsCounter, 207 mSDsluCounter, 1020 mSDsCounter, 0 mSdLazyCounter, 8023 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 1220 SdHoareTripleChecker+Invalid, 8100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 8023 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:32:03,840 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 1220 Invalid, 8100 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [77 Valid, 8023 Invalid, 0 Unknown, 0 Unchecked, 11.5s Time] [2021-11-23 03:32:03,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2906 states. [2021-11-23 03:32:04,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2906 to 2900. [2021-11-23 03:32:04,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2900 states, 2894 states have (on average 1.2622667588113339) internal successors, (3653), 2898 states have internal predecessors, (3653), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:32:04,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2900 states to 2900 states and 3658 transitions. [2021-11-23 03:32:04,200 INFO L78 Accepts]: Start accepts. Automaton has 2900 states and 3658 transitions. Word has length 152 [2021-11-23 03:32:04,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:32:04,201 INFO L470 AbstractCegarLoop]: Abstraction has 2900 states and 3658 transitions. [2021-11-23 03:32:04,201 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.22) internal successors, (111), 49 states have internal predecessors, (111), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:32:04,201 INFO L276 IsEmpty]: Start isEmpty. Operand 2900 states and 3658 transitions. [2021-11-23 03:32:04,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2021-11-23 03:32:04,205 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:32:04,205 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:32:04,244 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 03:32:04,428 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:32:04,429 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:32:04,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:32:04,429 INFO L85 PathProgramCache]: Analyzing trace with hash -668755891, now seen corresponding path program 1 times [2021-11-23 03:32:04,429 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:32:04,430 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [358998884] [2021-11-23 03:32:04,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:32:04,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:32:04,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:32:04,508 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 37 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 03:32:04,509 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:32:04,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [358998884] [2021-11-23 03:32:04,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [358998884] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:32:04,510 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:32:04,510 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:32:04,510 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91919444] [2021-11-23 03:32:04,510 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:32:04,511 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:32:04,511 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:32:04,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:32:04,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:32:04,512 INFO L87 Difference]: Start difference. First operand 2900 states and 3658 transitions. Second operand has 4 states, 4 states have (on average 37.0) internal successors, (148), 4 states have internal predecessors, (148), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:32:05,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:32:05,096 INFO L93 Difference]: Finished difference Result 6208 states and 7876 transitions. [2021-11-23 03:32:05,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:32:05,097 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 37.0) internal successors, (148), 4 states have internal predecessors, (148), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 172 [2021-11-23 03:32:05,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:32:05,102 INFO L225 Difference]: With dead ends: 6208 [2021-11-23 03:32:05,102 INFO L226 Difference]: Without dead ends: 3370 [2021-11-23 03:32:05,108 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:32:05,109 INFO L933 BasicCegarLoop]: 390 mSDtfsCounter, 316 mSDsluCounter, 528 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 316 SdHoareTripleChecker+Valid, 877 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:32:05,110 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [316 Valid, 877 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 217 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:32:05,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3370 states. [2021-11-23 03:32:05,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3370 to 3066. [2021-11-23 03:32:05,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3066 states, 3060 states have (on average 1.2506535947712418) internal successors, (3827), 3064 states have internal predecessors, (3827), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:32:05,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3066 states to 3066 states and 3832 transitions. [2021-11-23 03:32:05,472 INFO L78 Accepts]: Start accepts. Automaton has 3066 states and 3832 transitions. Word has length 172 [2021-11-23 03:32:05,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:32:05,472 INFO L470 AbstractCegarLoop]: Abstraction has 3066 states and 3832 transitions. [2021-11-23 03:32:05,473 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 37.0) internal successors, (148), 4 states have internal predecessors, (148), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:32:05,473 INFO L276 IsEmpty]: Start isEmpty. Operand 3066 states and 3832 transitions. [2021-11-23 03:32:05,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-11-23 03:32:05,476 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:32:05,476 INFO L514 BasicCegarLoop]: trace histogram [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, 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] [2021-11-23 03:32:05,476 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-23 03:32:05,476 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:32:05,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:32:05,477 INFO L85 PathProgramCache]: Analyzing trace with hash -1912540666, now seen corresponding path program 1 times [2021-11-23 03:32:05,477 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:32:05,477 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1885284348] [2021-11-23 03:32:05,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:32:05,478 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:32:05,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:32:05,552 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 39 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-23 03:32:05,552 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:32:05,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1885284348] [2021-11-23 03:32:05,553 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1885284348] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:32:05,553 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:32:05,553 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 03:32:05,553 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521087031] [2021-11-23 03:32:05,553 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:32:05,554 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:32:05,554 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:32:05,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:32:05,555 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:32:05,555 INFO L87 Difference]: Start difference. First operand 3066 states and 3832 transitions. Second operand has 6 states, 6 states have (on average 25.333333333333332) internal successors, (152), 5 states have internal predecessors, (152), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:32:06,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:32:06,077 INFO L93 Difference]: Finished difference Result 6846 states and 8617 transitions. [2021-11-23 03:32:06,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 03:32:06,080 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 25.333333333333332) internal successors, (152), 5 states have internal predecessors, (152), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 173 [2021-11-23 03:32:06,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:32:06,084 INFO L225 Difference]: With dead ends: 6846 [2021-11-23 03:32:06,084 INFO L226 Difference]: Without dead ends: 3726 [2021-11-23 03:32:06,090 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:32:06,091 INFO L933 BasicCegarLoop]: 352 mSDtfsCounter, 335 mSDsluCounter, 887 mSDsCounter, 0 mSdLazyCounter, 234 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 335 SdHoareTripleChecker+Valid, 1156 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 234 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:32:06,091 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [335 Valid, 1156 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 234 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:32:06,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3726 states. [2021-11-23 03:32:06,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3726 to 3206. [2021-11-23 03:32:06,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3206 states, 3200 states have (on average 1.253125) internal successors, (4010), 3204 states have internal predecessors, (4010), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:32:06,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3206 states to 3206 states and 4015 transitions. [2021-11-23 03:32:06,387 INFO L78 Accepts]: Start accepts. Automaton has 3206 states and 4015 transitions. Word has length 173 [2021-11-23 03:32:06,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:32:06,387 INFO L470 AbstractCegarLoop]: Abstraction has 3206 states and 4015 transitions. [2021-11-23 03:32:06,388 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 25.333333333333332) internal successors, (152), 5 states have internal predecessors, (152), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:32:06,388 INFO L276 IsEmpty]: Start isEmpty. Operand 3206 states and 4015 transitions. [2021-11-23 03:32:06,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-11-23 03:32:06,389 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:32:06,390 INFO L514 BasicCegarLoop]: trace histogram [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, 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] [2021-11-23 03:32:06,390 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-23 03:32:06,390 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:32:06,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:32:06,391 INFO L85 PathProgramCache]: Analyzing trace with hash 96890734, now seen corresponding path program 1 times [2021-11-23 03:32:06,391 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:32:06,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2053574361] [2021-11-23 03:32:06,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:32:06,391 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:32:06,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:32:06,433 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 40 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 03:32:06,433 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:32:06,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2053574361] [2021-11-23 03:32:06,433 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2053574361] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:32:06,433 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:32:06,434 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:32:06,434 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081056786] [2021-11-23 03:32:06,434 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:32:06,435 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:32:06,435 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:32:06,435 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:32:06,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:32:06,436 INFO L87 Difference]: Start difference. First operand 3206 states and 4015 transitions. Second operand has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 3 states have internal predecessors, (151), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:32:06,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:32:06,996 INFO L93 Difference]: Finished difference Result 7655 states and 9626 transitions. [2021-11-23 03:32:06,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:32:07,002 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), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 174 [2021-11-23 03:32:07,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:32:07,011 INFO L225 Difference]: With dead ends: 7655 [2021-11-23 03:32:07,011 INFO L226 Difference]: Without dead ends: 4465 [2021-11-23 03:32:07,022 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:32:07,024 INFO L933 BasicCegarLoop]: 385 mSDtfsCounter, 205 mSDsluCounter, 293 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 652 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:32:07,025 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [205 Valid, 652 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:32:07,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4465 states. [2021-11-23 03:32:07,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4465 to 4407. [2021-11-23 03:32:07,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4407 states, 4401 states have (on average 1.2467620995228357) internal successors, (5487), 4405 states have internal predecessors, (5487), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:32:07,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4407 states to 4407 states and 5492 transitions. [2021-11-23 03:32:07,446 INFO L78 Accepts]: Start accepts. Automaton has 4407 states and 5492 transitions. Word has length 174 [2021-11-23 03:32:07,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:32:07,447 INFO L470 AbstractCegarLoop]: Abstraction has 4407 states and 5492 transitions. [2021-11-23 03:32:07,447 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), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:32:07,447 INFO L276 IsEmpty]: Start isEmpty. Operand 4407 states and 5492 transitions. [2021-11-23 03:32:07,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2021-11-23 03:32:07,452 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:32:07,452 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:32:07,452 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-11-23 03:32:07,453 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:32:07,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:32:07,453 INFO L85 PathProgramCache]: Analyzing trace with hash 769936726, now seen corresponding path program 1 times [2021-11-23 03:32:07,453 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:32:07,454 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1811892351] [2021-11-23 03:32:07,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:32:07,454 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:32:07,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:32:07,576 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 98 proven. 99 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 03:32:07,577 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:32:07,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1811892351] [2021-11-23 03:32:07,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1811892351] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:32:07,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1456882675] [2021-11-23 03:32:07,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:32:07,578 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:32:07,578 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:32:07,581 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:32:07,596 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 03:32:07,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:32:07,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 769 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 03:32:07,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:32:08,272 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 197 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 03:32:08,272 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:32:08,273 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1456882675] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:32:08,273 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:32:08,273 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7] total 9 [2021-11-23 03:32:08,273 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620970994] [2021-11-23 03:32:08,273 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:32:08,274 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:32:08,274 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:32:08,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:32:08,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:32:08,275 INFO L87 Difference]: Start difference. First operand 4407 states and 5492 transitions. Second operand has 7 states, 7 states have (on average 34.42857142857143) internal successors, (241), 7 states have internal predecessors, (241), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:32:09,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:32:09,599 INFO L93 Difference]: Finished difference Result 13784 states and 17269 transitions. [2021-11-23 03:32:09,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 03:32:09,600 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 34.42857142857143) internal successors, (241), 7 states have internal predecessors, (241), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 247 [2021-11-23 03:32:09,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:32:09,610 INFO L225 Difference]: With dead ends: 13784 [2021-11-23 03:32:09,610 INFO L226 Difference]: Without dead ends: 9538 [2021-11-23 03:32:09,615 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 252 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=144, Unknown=0, NotChecked=0, Total=210 [2021-11-23 03:32:09,615 INFO L933 BasicCegarLoop]: 787 mSDtfsCounter, 1313 mSDsluCounter, 1475 mSDsCounter, 0 mSdLazyCounter, 326 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1313 SdHoareTripleChecker+Valid, 2144 SdHoareTripleChecker+Invalid, 387 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 326 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:32:09,616 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1313 Valid, 2144 Invalid, 387 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 326 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:32:09,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9538 states. [2021-11-23 03:32:10,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9538 to 6897. [2021-11-23 03:32:10,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6897 states, 6891 states have (on average 1.2596139892613554) internal successors, (8680), 6895 states have internal predecessors, (8680), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:32:10,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6897 states to 6897 states and 8685 transitions. [2021-11-23 03:32:10,217 INFO L78 Accepts]: Start accepts. Automaton has 6897 states and 8685 transitions. Word has length 247 [2021-11-23 03:32:10,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:32:10,218 INFO L470 AbstractCegarLoop]: Abstraction has 6897 states and 8685 transitions. [2021-11-23 03:32:10,218 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 34.42857142857143) internal successors, (241), 7 states have internal predecessors, (241), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:32:10,218 INFO L276 IsEmpty]: Start isEmpty. Operand 6897 states and 8685 transitions. [2021-11-23 03:32:10,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 249 [2021-11-23 03:32:10,222 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:32:10,223 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:32:10,268 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 03:32:10,448 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-23 03:32:10,449 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:32:10,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:32:10,449 INFO L85 PathProgramCache]: Analyzing trace with hash -128096423, now seen corresponding path program 1 times [2021-11-23 03:32:10,449 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:32:10,449 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1119142730] [2021-11-23 03:32:10,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:32:10,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:32:10,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:32:10,545 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 41 proven. 0 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-23 03:32:10,545 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:32:10,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1119142730] [2021-11-23 03:32:10,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1119142730] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:32:10,546 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:32:10,546 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 03:32:10,546 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90371679] [2021-11-23 03:32:10,546 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:32:10,547 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:32:10,547 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:32:10,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:32:10,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:32:10,548 INFO L87 Difference]: Start difference. First operand 6897 states and 8685 transitions. Second operand has 7 states, 7 states have (on average 22.428571428571427) internal successors, (157), 7 states have internal predecessors, (157), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:32:13,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:32:13,639 INFO L93 Difference]: Finished difference Result 35104 states and 44044 transitions. [2021-11-23 03:32:13,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 03:32:13,639 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 22.428571428571427) internal successors, (157), 7 states have internal predecessors, (157), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 248 [2021-11-23 03:32:13,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:32:13,685 INFO L225 Difference]: With dead ends: 35104 [2021-11-23 03:32:13,685 INFO L226 Difference]: Without dead ends: 28368 [2021-11-23 03:32:13,701 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=172, Invalid=478, Unknown=0, NotChecked=0, Total=650 [2021-11-23 03:32:13,702 INFO L933 BasicCegarLoop]: 1040 mSDtfsCounter, 2935 mSDsluCounter, 4509 mSDsCounter, 0 mSdLazyCounter, 766 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2935 SdHoareTripleChecker+Valid, 5141 SdHoareTripleChecker+Invalid, 777 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 766 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:32:13,702 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2935 Valid, 5141 Invalid, 777 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 766 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 03:32:13,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28368 states. [2021-11-23 03:32:14,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28368 to 7330. [2021-11-23 03:32:14,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7330 states, 7324 states have (on average 1.2591480065537957) internal successors, (9222), 7328 states have internal predecessors, (9222), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:32:14,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7330 states to 7330 states and 9227 transitions. [2021-11-23 03:32:14,645 INFO L78 Accepts]: Start accepts. Automaton has 7330 states and 9227 transitions. Word has length 248 [2021-11-23 03:32:14,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:32:14,646 INFO L470 AbstractCegarLoop]: Abstraction has 7330 states and 9227 transitions. [2021-11-23 03:32:14,646 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 22.428571428571427) internal successors, (157), 7 states have internal predecessors, (157), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:32:14,646 INFO L276 IsEmpty]: Start isEmpty. Operand 7330 states and 9227 transitions. [2021-11-23 03:32:14,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2021-11-23 03:32:14,648 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:32:14,648 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:32:14,648 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-11-23 03:32:14,648 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:32:14,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:32:14,649 INFO L85 PathProgramCache]: Analyzing trace with hash 824718602, now seen corresponding path program 1 times [2021-11-23 03:32:14,649 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:32:14,649 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [353742150] [2021-11-23 03:32:14,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:32:14,649 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:32:14,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:32:14,727 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-23 03:32:14,727 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:32:14,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [353742150] [2021-11-23 03:32:14,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [353742150] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:32:14,728 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:32:14,728 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 03:32:14,728 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1389027066] [2021-11-23 03:32:14,728 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:32:14,729 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:32:14,729 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:32:14,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:32:14,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:32:14,730 INFO L87 Difference]: Start difference. First operand 7330 states and 9227 transitions. Second operand has 5 states, 5 states have (on average 31.6) internal successors, (158), 5 states have internal predecessors, (158), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:32:16,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:32:16,893 INFO L93 Difference]: Finished difference Result 24929 states and 31224 transitions. [2021-11-23 03:32:16,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 03:32:16,893 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 31.6) internal successors, (158), 5 states have internal predecessors, (158), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 249 [2021-11-23 03:32:16,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:32:16,918 INFO L225 Difference]: With dead ends: 24929 [2021-11-23 03:32:16,918 INFO L226 Difference]: Without dead ends: 17760 [2021-11-23 03:32:16,927 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:32:16,928 INFO L933 BasicCegarLoop]: 557 mSDtfsCounter, 1081 mSDsluCounter, 1522 mSDsCounter, 0 mSdLazyCounter, 284 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1081 SdHoareTripleChecker+Valid, 1915 SdHoareTripleChecker+Invalid, 289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 284 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:32:16,929 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1081 Valid, 1915 Invalid, 289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 284 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:32:16,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17760 states. [2021-11-23 03:32:17,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17760 to 7862. [2021-11-23 03:32:17,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7862 states, 7856 states have (on average 1.255600814663951) internal successors, (9864), 7860 states have internal predecessors, (9864), 5 states have call successors, (5), 1 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:32:17,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7862 states to 7862 states and 9869 transitions. [2021-11-23 03:32:17,816 INFO L78 Accepts]: Start accepts. Automaton has 7862 states and 9869 transitions. Word has length 249 [2021-11-23 03:32:17,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:32:17,816 INFO L470 AbstractCegarLoop]: Abstraction has 7862 states and 9869 transitions. [2021-11-23 03:32:17,817 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 31.6) internal successors, (158), 5 states have internal predecessors, (158), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:32:17,817 INFO L276 IsEmpty]: Start isEmpty. Operand 7862 states and 9869 transitions. [2021-11-23 03:32:17,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 303 [2021-11-23 03:32:17,820 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:32:17,820 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:32:17,820 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-11-23 03:32:17,821 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:32:17,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:32:17,821 INFO L85 PathProgramCache]: Analyzing trace with hash -225466146, now seen corresponding path program 1 times [2021-11-23 03:32:17,822 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:32:17,822 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1151284657] [2021-11-23 03:32:17,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:32:17,822 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:32:17,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:32:18,183 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 37 proven. 137 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-23 03:32:18,183 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:32:18,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1151284657] [2021-11-23 03:32:18,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1151284657] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:32:18,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1956840302] [2021-11-23 03:32:18,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:32:18,184 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:32:18,184 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:32:18,186 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:32:18,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa3f9082-c7e9-4084-ad7a-654f465d8073/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 03:32:18,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:32:18,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 897 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 03:32:18,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:32:19,354 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 39 proven. 119 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-23 03:32:19,355 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:32:20,222 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 15 proven. 143 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-23 03:32:20,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1956840302] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:32:20,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1452171532] [2021-11-23 03:32:20,230 INFO L159 IcfgInterpreter]: Started Sifa with 159 locations of interest [2021-11-23 03:32:20,230 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:32:20,231 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:32:20,232 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:32:20,232 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs