./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem03_label45.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_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/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_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem03_label45.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/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_8eafdcd4-9265-4ea8-bdb7-d77940dab347/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 e46cda06cd6f3e72cb5a00e680e37793de7d3fd440c55f6638f7eefc5d4b52af --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:09:13,264 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:09:13,268 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:09:13,336 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:09:13,337 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:09:13,343 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:09:13,345 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:09:13,348 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:09:13,351 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:09:13,358 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:09:13,360 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:09:13,363 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:09:13,363 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:09:13,367 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:09:13,370 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:09:13,375 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:09:13,378 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:09:13,379 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:09:13,382 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:09:13,392 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:09:13,394 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:09:13,397 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:09:13,399 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:09:13,400 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:09:13,404 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:09:13,405 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:09:13,406 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:09:13,407 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:09:13,408 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:09:13,409 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:09:13,410 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:09:13,411 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:09:13,412 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:09:13,413 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:09:13,415 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:09:13,415 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:09:13,416 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:09:13,416 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:09:13,417 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:09:13,418 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:09:13,419 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:09:13,420 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:09:13,451 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:09:13,451 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:09:13,452 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:09:13,452 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:09:13,453 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:09:13,453 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:09:13,453 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:09:13,454 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:09:13,454 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:09:13,454 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:09:13,455 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:09:13,455 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:09:13,455 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:09:13,455 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:09:13,456 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:09:13,456 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:09:13,456 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:09:13,457 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:09:13,458 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:09:13,458 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:09:13,458 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:09:13,458 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:09:13,459 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:09:13,459 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:09:13,459 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:09:13,460 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:09:13,460 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:09:13,460 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:09:13,460 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:09:13,461 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:09:13,461 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:09:13,461 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:09:13,462 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:09:13,462 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:09:13,462 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:09:13,462 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:09:13,463 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:09:13,463 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:09:13,463 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:09:13,464 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:09:13,464 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:09:13,464 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_8eafdcd4-9265-4ea8-bdb7-d77940dab347/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e46cda06cd6f3e72cb5a00e680e37793de7d3fd440c55f6638f7eefc5d4b52af [2021-11-23 02:09:13,768 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:09:13,814 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:09:13,817 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:09:13,818 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:09:13,819 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:09:13,821 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/eca-rers2012/Problem03_label45.c [2021-11-23 02:09:13,924 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/data/77af3e031/9333306afb56418a8e1c258221ee185e/FLAG6bccdf110 [2021-11-23 02:09:14,876 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:09:14,877 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/sv-benchmarks/c/eca-rers2012/Problem03_label45.c [2021-11-23 02:09:14,903 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/data/77af3e031/9333306afb56418a8e1c258221ee185e/FLAG6bccdf110 [2021-11-23 02:09:14,954 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/data/77af3e031/9333306afb56418a8e1c258221ee185e [2021-11-23 02:09:14,957 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:09:14,960 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:09:14,965 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:09:14,965 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:09:14,971 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:09:14,972 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:09:14" (1/1) ... [2021-11-23 02:09:14,974 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@385fdd5e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:14, skipping insertion in model container [2021-11-23 02:09:14,974 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:09:14" (1/1) ... [2021-11-23 02:09:14,983 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:09:15,104 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:09:15,967 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_8eafdcd4-9265-4ea8-bdb7-d77940dab347/sv-benchmarks/c/eca-rers2012/Problem03_label45.c[53653,53666] [2021-11-23 02:09:16,023 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:09:16,037 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:09:16,367 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_8eafdcd4-9265-4ea8-bdb7-d77940dab347/sv-benchmarks/c/eca-rers2012/Problem03_label45.c[53653,53666] [2021-11-23 02:09:16,394 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:09:16,419 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:09:16,420 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:16 WrapperNode [2021-11-23 02:09:16,420 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:09:16,422 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:09:16,422 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:09:16,422 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:09:16,432 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:16" (1/1) ... [2021-11-23 02:09:16,479 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:16" (1/1) ... [2021-11-23 02:09:16,616 INFO L137 Inliner]: procedures = 14, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 1771 [2021-11-23 02:09:16,617 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:09:16,618 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:09:16,618 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:09:16,619 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:09:16,629 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:16" (1/1) ... [2021-11-23 02:09:16,629 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:16" (1/1) ... [2021-11-23 02:09:16,640 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:16" (1/1) ... [2021-11-23 02:09:16,640 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:16" (1/1) ... [2021-11-23 02:09:16,717 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:16" (1/1) ... [2021-11-23 02:09:16,737 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:16" (1/1) ... [2021-11-23 02:09:16,762 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:16" (1/1) ... [2021-11-23 02:09:16,775 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:09:16,776 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:09:16,776 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:09:16,776 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:09:16,777 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:16" (1/1) ... [2021-11-23 02:09:16,787 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:09:16,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:16,816 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:09:16,820 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:09:16,869 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:09:16,870 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:09:16,870 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:09:16,870 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:09:16,971 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:09:16,973 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:09:19,227 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:09:19,603 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:09:19,603 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 02:09:19,608 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:09:19 BoogieIcfgContainer [2021-11-23 02:09:19,608 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:09:19,613 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:09:19,613 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:09:19,618 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:09:19,619 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:09:14" (1/3) ... [2021-11-23 02:09:19,620 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@87534f1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:09:19, skipping insertion in model container [2021-11-23 02:09:19,620 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:16" (2/3) ... [2021-11-23 02:09:19,621 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@87534f1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:09:19, skipping insertion in model container [2021-11-23 02:09:19,621 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:09:19" (3/3) ... [2021-11-23 02:09:19,625 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem03_label45.c [2021-11-23 02:09:19,632 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:09:19,632 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:09:19,711 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:09:19,722 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 02:09:19,722 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:09:19,754 INFO L276 IsEmpty]: Start isEmpty. Operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:19,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-23 02:09:19,780 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:19,781 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:19,782 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:19,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:19,789 INFO L85 PathProgramCache]: Analyzing trace with hash -1725563226, now seen corresponding path program 1 times [2021-11-23 02:09:19,802 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:19,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [223251076] [2021-11-23 02:09:19,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:19,805 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:20,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:20,654 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 02:09:20,655 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:20,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [223251076] [2021-11-23 02:09:20,656 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [223251076] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:20,657 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:09:20,657 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:09:20,659 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [189704661] [2021-11-23 02:09:20,660 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:20,666 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:09:20,680 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:20,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:09:20,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:09:20,729 INFO L87 Difference]: Start difference. First operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:21,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:21,984 INFO L93 Difference]: Finished difference Result 440 states and 860 transitions. [2021-11-23 02:09:21,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:09:21,987 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 143 [2021-11-23 02:09:21,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:22,005 INFO L225 Difference]: With dead ends: 440 [2021-11-23 02:09:22,006 INFO L226 Difference]: Without dead ends: 289 [2021-11-23 02:09:22,010 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 02:09:22,015 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 10 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 471 mSolverCounterSat, 149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 620 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 149 IncrementalHoareTripleChecker+Valid, 471 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:22,016 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 30 Invalid, 620 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [149 Valid, 471 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-23 02:09:22,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-11-23 02:09:22,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2021-11-23 02:09:22,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 288 states have (on average 1.8923611111111112) internal successors, (545), 288 states have internal predecessors, (545), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:22,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 545 transitions. [2021-11-23 02:09:22,090 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 545 transitions. Word has length 143 [2021-11-23 02:09:22,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:22,092 INFO L470 AbstractCegarLoop]: Abstraction has 289 states and 545 transitions. [2021-11-23 02:09:22,092 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:22,093 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 545 transitions. [2021-11-23 02:09:22,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-23 02:09:22,098 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:22,099 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:09:22,099 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:09:22,100 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:22,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:22,101 INFO L85 PathProgramCache]: Analyzing trace with hash 1066966282, now seen corresponding path program 1 times [2021-11-23 02:09:22,101 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:22,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1302543766] [2021-11-23 02:09:22,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:22,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:22,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:22,245 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 02:09:22,252 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:22,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1302543766] [2021-11-23 02:09:22,253 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1302543766] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:22,255 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:09:22,256 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:09:22,256 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [433800412] [2021-11-23 02:09:22,257 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:22,259 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:09:22,261 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:22,262 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:09:22,263 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:09:22,263 INFO L87 Difference]: Start difference. First operand 289 states and 545 transitions. Second operand has 3 states, 3 states have (on average 49.666666666666664) internal successors, (149), 2 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:23,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:23,272 INFO L93 Difference]: Finished difference Result 863 states and 1632 transitions. [2021-11-23 02:09:23,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:09:23,273 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 49.666666666666664) internal successors, (149), 2 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 149 [2021-11-23 02:09:23,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:23,278 INFO L225 Difference]: With dead ends: 863 [2021-11-23 02:09:23,279 INFO L226 Difference]: Without dead ends: 575 [2021-11-23 02:09:23,281 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 02:09:23,283 INFO L933 BasicCegarLoop]: 92 mSDtfsCounter, 152 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 451 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 574 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 451 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:23,284 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [152 Valid, 95 Invalid, 574 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 451 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-23 02:09:23,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2021-11-23 02:09:23,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 575. [2021-11-23 02:09:23,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 574 states have (on average 1.5609756097560976) internal successors, (896), 574 states have internal predecessors, (896), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:23,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 896 transitions. [2021-11-23 02:09:23,323 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 896 transitions. Word has length 149 [2021-11-23 02:09:23,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:23,324 INFO L470 AbstractCegarLoop]: Abstraction has 575 states and 896 transitions. [2021-11-23 02:09:23,324 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 49.666666666666664) internal successors, (149), 2 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:23,325 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 896 transitions. [2021-11-23 02:09:23,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-11-23 02:09:23,332 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:23,333 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:23,333 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:09:23,334 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:23,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:23,335 INFO L85 PathProgramCache]: Analyzing trace with hash -954525509, now seen corresponding path program 1 times [2021-11-23 02:09:23,335 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:23,335 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922088672] [2021-11-23 02:09:23,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:23,336 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:23,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:23,412 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:09:23,412 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:23,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922088672] [2021-11-23 02:09:23,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [922088672] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:23,413 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:09:23,413 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:09:23,413 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337144091] [2021-11-23 02:09:23,414 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:23,414 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:09:23,415 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:23,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:09:23,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:09:23,416 INFO L87 Difference]: Start difference. First operand 575 states and 896 transitions. Second operand has 3 states, 3 states have (on average 51.666666666666664) internal successors, (155), 2 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:24,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:24,346 INFO L93 Difference]: Finished difference Result 1723 states and 2686 transitions. [2021-11-23 02:09:24,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:09:24,347 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 51.666666666666664) internal successors, (155), 2 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 155 [2021-11-23 02:09:24,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:24,377 INFO L225 Difference]: With dead ends: 1723 [2021-11-23 02:09:24,378 INFO L226 Difference]: Without dead ends: 1149 [2021-11-23 02:09:24,381 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 02:09:24,385 INFO L933 BasicCegarLoop]: 101 mSDtfsCounter, 183 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 611 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 632 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 611 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:24,386 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [183 Valid, 105 Invalid, 632 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 611 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:09:24,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1149 states. [2021-11-23 02:09:24,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1149 to 1147. [2021-11-23 02:09:24,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1147 states, 1146 states have (on average 1.5383944153577662) internal successors, (1763), 1146 states have internal predecessors, (1763), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:24,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1147 states to 1147 states and 1763 transitions. [2021-11-23 02:09:24,468 INFO L78 Accepts]: Start accepts. Automaton has 1147 states and 1763 transitions. Word has length 155 [2021-11-23 02:09:24,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:24,472 INFO L470 AbstractCegarLoop]: Abstraction has 1147 states and 1763 transitions. [2021-11-23 02:09:24,472 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 51.666666666666664) internal successors, (155), 2 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:24,473 INFO L276 IsEmpty]: Start isEmpty. Operand 1147 states and 1763 transitions. [2021-11-23 02:09:24,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-11-23 02:09:24,486 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:24,487 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:24,487 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 02:09:24,487 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:24,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:24,488 INFO L85 PathProgramCache]: Analyzing trace with hash 1007943017, now seen corresponding path program 1 times [2021-11-23 02:09:24,489 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:24,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [858172182] [2021-11-23 02:09:24,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:24,490 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:24,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:24,569 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:09:24,570 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:24,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [858172182] [2021-11-23 02:09:24,570 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [858172182] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:24,570 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:09:24,571 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:09:24,571 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [319486744] [2021-11-23 02:09:24,571 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:24,572 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:09:24,572 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:24,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:09:24,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:09:24,573 INFO L87 Difference]: Start difference. First operand 1147 states and 1763 transitions. Second operand has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:25,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:25,500 INFO L93 Difference]: Finished difference Result 3437 states and 5286 transitions. [2021-11-23 02:09:25,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:09:25,501 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 157 [2021-11-23 02:09:25,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:25,518 INFO L225 Difference]: With dead ends: 3437 [2021-11-23 02:09:25,519 INFO L226 Difference]: Without dead ends: 2291 [2021-11-23 02:09:25,521 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 02:09:25,523 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 157 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 452 mSolverCounterSat, 170 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 157 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 622 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 170 IncrementalHoareTripleChecker+Valid, 452 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:25,524 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [157 Valid, 25 Invalid, 622 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [170 Valid, 452 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:09:25,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2291 states. [2021-11-23 02:09:25,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2291 to 2291. [2021-11-23 02:09:25,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2291 states, 2290 states have (on average 1.502183406113537) internal successors, (3440), 2290 states have internal predecessors, (3440), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:25,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2291 states to 2291 states and 3440 transitions. [2021-11-23 02:09:25,632 INFO L78 Accepts]: Start accepts. Automaton has 2291 states and 3440 transitions. Word has length 157 [2021-11-23 02:09:25,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:25,633 INFO L470 AbstractCegarLoop]: Abstraction has 2291 states and 3440 transitions. [2021-11-23 02:09:25,633 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:25,633 INFO L276 IsEmpty]: Start isEmpty. Operand 2291 states and 3440 transitions. [2021-11-23 02:09:25,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2021-11-23 02:09:25,642 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:25,642 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:25,642 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 02:09:25,642 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:25,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:25,646 INFO L85 PathProgramCache]: Analyzing trace with hash -513437, now seen corresponding path program 1 times [2021-11-23 02:09:25,647 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:25,647 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1834727653] [2021-11-23 02:09:25,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:25,647 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:25,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:25,794 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 50 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 02:09:25,794 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:25,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1834727653] [2021-11-23 02:09:25,795 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1834727653] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:25,795 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:09:25,795 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:09:25,795 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006955240] [2021-11-23 02:09:25,795 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:25,796 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:09:25,796 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:25,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:09:25,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:09:25,798 INFO L87 Difference]: Start difference. First operand 2291 states and 3440 transitions. Second operand has 3 states, 3 states have (on average 53.333333333333336) internal successors, (160), 3 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:26,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:26,783 INFO L93 Difference]: Finished difference Result 5725 states and 8951 transitions. [2021-11-23 02:09:26,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:09:26,784 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 53.333333333333336) internal successors, (160), 3 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 171 [2021-11-23 02:09:26,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:26,808 INFO L225 Difference]: With dead ends: 5725 [2021-11-23 02:09:26,809 INFO L226 Difference]: Without dead ends: 3435 [2021-11-23 02:09:26,813 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 02:09:26,821 INFO L933 BasicCegarLoop]: 257 mSDtfsCounter, 150 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 407 mSolverCounterSat, 162 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 569 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 162 IncrementalHoareTripleChecker+Valid, 407 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:26,823 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [150 Valid, 261 Invalid, 569 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [162 Valid, 407 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 02:09:26,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3435 states. [2021-11-23 02:09:26,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3435 to 3435. [2021-11-23 02:09:26,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3435 states, 3434 states have (on average 1.4181712288875947) internal successors, (4870), 3434 states have internal predecessors, (4870), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:26,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3435 states to 3435 states and 4870 transitions. [2021-11-23 02:09:26,956 INFO L78 Accepts]: Start accepts. Automaton has 3435 states and 4870 transitions. Word has length 171 [2021-11-23 02:09:26,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:26,958 INFO L470 AbstractCegarLoop]: Abstraction has 3435 states and 4870 transitions. [2021-11-23 02:09:26,958 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 53.333333333333336) internal successors, (160), 3 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:26,958 INFO L276 IsEmpty]: Start isEmpty. Operand 3435 states and 4870 transitions. [2021-11-23 02:09:26,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-11-23 02:09:26,974 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:26,975 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:26,975 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 02:09:26,975 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:26,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:26,977 INFO L85 PathProgramCache]: Analyzing trace with hash 574302187, now seen corresponding path program 1 times [2021-11-23 02:09:26,977 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:26,977 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1740100520] [2021-11-23 02:09:26,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:26,978 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:27,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:27,098 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:09:27,099 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:27,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1740100520] [2021-11-23 02:09:27,099 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1740100520] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:27,099 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:09:27,099 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:09:27,100 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978892049] [2021-11-23 02:09:27,100 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:27,101 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:09:27,101 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:27,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:09:27,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:09:27,103 INFO L87 Difference]: Start difference. First operand 3435 states and 4870 transitions. Second operand has 3 states, 3 states have (on average 57.0) internal successors, (171), 3 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:28,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:28,174 INFO L93 Difference]: Finished difference Result 8299 states and 11722 transitions. [2021-11-23 02:09:28,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:09:28,176 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 57.0) internal successors, (171), 3 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 176 [2021-11-23 02:09:28,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:28,209 INFO L225 Difference]: With dead ends: 8299 [2021-11-23 02:09:28,209 INFO L226 Difference]: Without dead ends: 4865 [2021-11-23 02:09:28,215 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 02:09:28,219 INFO L933 BasicCegarLoop]: 262 mSDtfsCounter, 129 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 475 mSolverCounterSat, 110 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 266 SdHoareTripleChecker+Invalid, 585 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 110 IncrementalHoareTripleChecker+Valid, 475 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:28,223 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 266 Invalid, 585 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [110 Valid, 475 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-23 02:09:28,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4865 states. [2021-11-23 02:09:28,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4865 to 4865. [2021-11-23 02:09:28,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4865 states, 4864 states have (on average 1.359580592105263) internal successors, (6613), 4864 states have internal predecessors, (6613), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:28,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4865 states to 4865 states and 6613 transitions. [2021-11-23 02:09:28,392 INFO L78 Accepts]: Start accepts. Automaton has 4865 states and 6613 transitions. Word has length 176 [2021-11-23 02:09:28,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:28,393 INFO L470 AbstractCegarLoop]: Abstraction has 4865 states and 6613 transitions. [2021-11-23 02:09:28,393 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 57.0) internal successors, (171), 3 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:28,394 INFO L276 IsEmpty]: Start isEmpty. Operand 4865 states and 6613 transitions. [2021-11-23 02:09:28,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2021-11-23 02:09:28,407 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:28,408 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:09:28,408 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 02:09:28,409 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:28,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:28,410 INFO L85 PathProgramCache]: Analyzing trace with hash -1776267830, now seen corresponding path program 1 times [2021-11-23 02:09:28,410 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:28,410 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [401754769] [2021-11-23 02:09:28,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:28,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:28,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:28,549 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 36 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:09:28,550 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:28,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [401754769] [2021-11-23 02:09:28,550 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [401754769] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:09:28,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1471321666] [2021-11-23 02:09:28,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:28,551 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:28,551 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:28,553 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:28,581 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:09:28,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:28,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:09:28,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:29,359 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 02:09:29,359 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:09:29,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1471321666] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:29,360 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:09:29,360 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3] total 4 [2021-11-23 02:09:29,361 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143021208] [2021-11-23 02:09:29,361 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:29,362 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:09:29,362 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:29,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:09:29,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:09:29,364 INFO L87 Difference]: Start difference. First operand 4865 states and 6613 transitions. Second operand has 3 states, 3 states have (on average 48.666666666666664) internal successors, (146), 2 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:30,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:30,526 INFO L93 Difference]: Finished difference Result 14019 states and 19151 transitions. [2021-11-23 02:09:30,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:09:30,527 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 48.666666666666664) internal successors, (146), 2 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 180 [2021-11-23 02:09:30,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:30,598 INFO L225 Difference]: With dead ends: 14019 [2021-11-23 02:09:30,599 INFO L226 Difference]: Without dead ends: 9155 [2021-11-23 02:09:30,607 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 179 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:09:30,609 INFO L933 BasicCegarLoop]: 119 mSDtfsCounter, 10 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 567 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 605 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 567 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:30,611 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 135 Invalid, 605 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 567 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-23 02:09:30,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9155 states. [2021-11-23 02:09:30,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9155 to 8297. [2021-11-23 02:09:30,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8297 states, 8296 states have (on average 1.3795805207328833) internal successors, (11445), 8296 states have internal predecessors, (11445), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:30,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8297 states to 8297 states and 11445 transitions. [2021-11-23 02:09:30,939 INFO L78 Accepts]: Start accepts. Automaton has 8297 states and 11445 transitions. Word has length 180 [2021-11-23 02:09:30,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:30,941 INFO L470 AbstractCegarLoop]: Abstraction has 8297 states and 11445 transitions. [2021-11-23 02:09:30,941 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 48.666666666666664) internal successors, (146), 2 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:30,941 INFO L276 IsEmpty]: Start isEmpty. Operand 8297 states and 11445 transitions. [2021-11-23 02:09:30,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2021-11-23 02:09:30,963 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:30,963 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:31,011 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:31,192 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:31,192 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:31,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:31,193 INFO L85 PathProgramCache]: Analyzing trace with hash -365576805, now seen corresponding path program 1 times [2021-11-23 02:09:31,193 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:31,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1713231081] [2021-11-23 02:09:31,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:31,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:31,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:31,327 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 02:09:31,328 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:31,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1713231081] [2021-11-23 02:09:31,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1713231081] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:31,329 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:09:31,329 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:09:31,329 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [610575954] [2021-11-23 02:09:31,329 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:31,330 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:09:31,330 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:31,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:09:31,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:09:31,331 INFO L87 Difference]: Start difference. First operand 8297 states and 11445 transitions. Second operand has 3 states, 3 states have (on average 55.666666666666664) internal successors, (167), 3 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:32,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:32,319 INFO L93 Difference]: Finished difference Result 19024 states and 26225 transitions. [2021-11-23 02:09:32,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:09:32,321 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 55.666666666666664) internal successors, (167), 3 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 189 [2021-11-23 02:09:32,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:32,378 INFO L225 Difference]: With dead ends: 19024 [2021-11-23 02:09:32,379 INFO L226 Difference]: Without dead ends: 10871 [2021-11-23 02:09:32,392 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 02:09:32,393 INFO L933 BasicCegarLoop]: 262 mSDtfsCounter, 132 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 449 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 266 SdHoareTripleChecker+Invalid, 578 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 449 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:32,393 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 266 Invalid, 578 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 449 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:09:32,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10871 states. [2021-11-23 02:09:32,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10871 to 10442. [2021-11-23 02:09:32,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10442 states, 10441 states have (on average 1.3414423905756154) internal successors, (14006), 10441 states have internal predecessors, (14006), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:32,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10442 states to 10442 states and 14006 transitions. [2021-11-23 02:09:32,755 INFO L78 Accepts]: Start accepts. Automaton has 10442 states and 14006 transitions. Word has length 189 [2021-11-23 02:09:32,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:32,756 INFO L470 AbstractCegarLoop]: Abstraction has 10442 states and 14006 transitions. [2021-11-23 02:09:32,757 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 55.666666666666664) internal successors, (167), 3 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:32,757 INFO L276 IsEmpty]: Start isEmpty. Operand 10442 states and 14006 transitions. [2021-11-23 02:09:32,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2021-11-23 02:09:32,781 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:32,781 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:09:32,781 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 02:09:32,782 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:32,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:32,783 INFO L85 PathProgramCache]: Analyzing trace with hash -756964145, now seen corresponding path program 1 times [2021-11-23 02:09:32,783 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:32,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1207165853] [2021-11-23 02:09:32,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:32,784 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:32,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:32,889 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 44 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:09:32,889 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:32,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1207165853] [2021-11-23 02:09:32,890 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1207165853] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:32,890 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:09:32,890 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:09:32,890 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [243394462] [2021-11-23 02:09:32,891 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:32,891 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:09:32,891 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:32,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:09:32,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:09:32,893 INFO L87 Difference]: Start difference. First operand 10442 states and 14006 transitions. Second operand has 3 states, 3 states have (on average 57.333333333333336) internal successors, (172), 2 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:33,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:33,984 INFO L93 Difference]: Finished difference Result 26319 states and 35397 transitions. [2021-11-23 02:09:33,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:09:33,985 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 57.333333333333336) internal successors, (172), 2 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 189 [2021-11-23 02:09:33,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:34,105 INFO L225 Difference]: With dead ends: 26319 [2021-11-23 02:09:34,112 INFO L226 Difference]: Without dead ends: 16021 [2021-11-23 02:09:34,123 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 02:09:34,124 INFO L933 BasicCegarLoop]: 92 mSDtfsCounter, 137 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 532 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 619 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 532 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:34,125 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 96 Invalid, 619 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 532 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:09:34,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16021 states. [2021-11-23 02:09:34,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16021 to 15018. [2021-11-23 02:09:34,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15018 states, 15017 states have (on average 1.332756209629087) internal successors, (20014), 15017 states have internal predecessors, (20014), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:34,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15018 states to 15018 states and 20014 transitions. [2021-11-23 02:09:34,643 INFO L78 Accepts]: Start accepts. Automaton has 15018 states and 20014 transitions. Word has length 189 [2021-11-23 02:09:34,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:34,643 INFO L470 AbstractCegarLoop]: Abstraction has 15018 states and 20014 transitions. [2021-11-23 02:09:34,644 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 57.333333333333336) internal successors, (172), 2 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:34,644 INFO L276 IsEmpty]: Start isEmpty. Operand 15018 states and 20014 transitions. [2021-11-23 02:09:34,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2021-11-23 02:09:34,673 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:34,675 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:09:34,675 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 02:09:34,675 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:34,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:34,677 INFO L85 PathProgramCache]: Analyzing trace with hash 719253552, now seen corresponding path program 1 times [2021-11-23 02:09:34,677 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:34,677 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1747400044] [2021-11-23 02:09:34,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:34,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:34,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:34,822 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:09:34,822 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:34,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1747400044] [2021-11-23 02:09:34,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1747400044] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:34,823 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:09:34,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:09:34,823 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330028111] [2021-11-23 02:09:34,823 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:34,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:09:34,824 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:34,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:09:34,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:09:34,885 INFO L87 Difference]: Start difference. First operand 15018 states and 20014 transitions. Second operand has 4 states, 4 states have (on average 48.0) internal successors, (192), 3 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:36,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:36,578 INFO L93 Difference]: Finished difference Result 31465 states and 41986 transitions. [2021-11-23 02:09:36,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:09:36,579 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 48.0) internal successors, (192), 3 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 192 [2021-11-23 02:09:36,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:36,622 INFO L225 Difference]: With dead ends: 31465 [2021-11-23 02:09:36,622 INFO L226 Difference]: Without dead ends: 16877 [2021-11-23 02:09:36,641 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:09:36,642 INFO L933 BasicCegarLoop]: 100 mSDtfsCounter, 245 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 1011 mSolverCounterSat, 173 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 245 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 1184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 173 IncrementalHoareTripleChecker+Valid, 1011 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:36,644 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [245 Valid, 109 Invalid, 1184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [173 Valid, 1011 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-11-23 02:09:36,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16877 states. [2021-11-23 02:09:37,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16877 to 14875. [2021-11-23 02:09:37,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14875 states, 14874 states have (on average 1.3331316391017884) internal successors, (19829), 14874 states have internal predecessors, (19829), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:37,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14875 states to 14875 states and 19829 transitions. [2021-11-23 02:09:37,163 INFO L78 Accepts]: Start accepts. Automaton has 14875 states and 19829 transitions. Word has length 192 [2021-11-23 02:09:37,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:37,164 INFO L470 AbstractCegarLoop]: Abstraction has 14875 states and 19829 transitions. [2021-11-23 02:09:37,164 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 48.0) internal successors, (192), 3 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:37,164 INFO L276 IsEmpty]: Start isEmpty. Operand 14875 states and 19829 transitions. [2021-11-23 02:09:37,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2021-11-23 02:09:37,192 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:37,193 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:37,193 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-23 02:09:37,194 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:37,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:37,195 INFO L85 PathProgramCache]: Analyzing trace with hash 180585389, now seen corresponding path program 1 times [2021-11-23 02:09:37,195 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:37,195 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1329398500] [2021-11-23 02:09:37,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:37,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:37,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:37,368 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 61 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:09:37,368 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:37,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1329398500] [2021-11-23 02:09:37,369 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1329398500] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:09:37,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1551143174] [2021-11-23 02:09:37,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:37,369 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:37,370 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:37,372 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:37,396 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:09:37,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:37,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:09:37,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:38,030 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 02:09:38,030 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:09:38,031 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1551143174] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:38,031 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:09:38,031 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3] total 4 [2021-11-23 02:09:38,032 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340321051] [2021-11-23 02:09:38,032 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:38,033 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:09:38,033 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:38,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:09:38,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:09:38,035 INFO L87 Difference]: Start difference. First operand 14875 states and 19829 transitions. Second operand has 3 states, 3 states have (on average 59.0) internal successors, (177), 2 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:38,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:38,745 INFO L93 Difference]: Finished difference Result 28176 states and 37574 transitions. [2021-11-23 02:09:38,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:09:38,746 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 59.0) internal successors, (177), 2 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 199 [2021-11-23 02:09:38,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:38,775 INFO L225 Difference]: With dead ends: 28176 [2021-11-23 02:09:38,775 INFO L226 Difference]: Without dead ends: 13731 [2021-11-23 02:09:38,790 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 198 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:09:38,791 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 227 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:38,791 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [227 Valid, 4 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:09:38,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13731 states. [2021-11-23 02:09:39,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13731 to 13731. [2021-11-23 02:09:39,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13731 states, 13730 states have (on average 1.2815003641660596) internal successors, (17595), 13730 states have internal predecessors, (17595), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:39,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13731 states to 13731 states and 17595 transitions. [2021-11-23 02:09:39,151 INFO L78 Accepts]: Start accepts. Automaton has 13731 states and 17595 transitions. Word has length 199 [2021-11-23 02:09:39,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:39,152 INFO L470 AbstractCegarLoop]: Abstraction has 13731 states and 17595 transitions. [2021-11-23 02:09:39,152 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 59.0) internal successors, (177), 2 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:39,152 INFO L276 IsEmpty]: Start isEmpty. Operand 13731 states and 17595 transitions. [2021-11-23 02:09:39,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2021-11-23 02:09:39,174 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:39,175 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 02:09:39,222 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:39,394 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:39,395 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:39,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:39,395 INFO L85 PathProgramCache]: Analyzing trace with hash 1827360236, now seen corresponding path program 1 times [2021-11-23 02:09:39,395 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:39,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1796196523] [2021-11-23 02:09:39,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:39,396 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:39,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:39,747 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:09:39,748 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:39,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1796196523] [2021-11-23 02:09:39,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1796196523] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:09:39,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [110428192] [2021-11-23 02:09:39,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:39,749 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:39,749 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:39,750 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:39,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:09:39,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:39,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 411 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:09:39,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:40,762 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2021-11-23 02:09:40,763 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:09:40,763 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [110428192] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:40,763 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:09:40,763 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3] total 4 [2021-11-23 02:09:40,764 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609007211] [2021-11-23 02:09:40,764 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:40,765 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:09:40,765 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:40,765 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:09:40,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:09:40,766 INFO L87 Difference]: Start difference. First operand 13731 states and 17595 transitions. Second operand has 3 states, 3 states have (on average 48.333333333333336) internal successors, (145), 2 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:41,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:41,795 INFO L93 Difference]: Finished difference Result 36041 states and 46158 transitions. [2021-11-23 02:09:41,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:09:41,795 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 48.333333333333336) internal successors, (145), 2 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 245 [2021-11-23 02:09:41,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:41,845 INFO L225 Difference]: With dead ends: 36041 [2021-11-23 02:09:41,846 INFO L226 Difference]: Without dead ends: 22740 [2021-11-23 02:09:41,862 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 244 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:09:41,863 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 31 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 508 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 555 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:41,864 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 71 Invalid, 555 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 508 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 02:09:41,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22740 states. [2021-11-23 02:09:42,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22740 to 19880. [2021-11-23 02:09:42,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19880 states, 19879 states have (on average 1.2662105739725338) internal successors, (25171), 19879 states have internal predecessors, (25171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:42,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19880 states to 19880 states and 25171 transitions. [2021-11-23 02:09:42,453 INFO L78 Accepts]: Start accepts. Automaton has 19880 states and 25171 transitions. Word has length 245 [2021-11-23 02:09:42,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:42,454 INFO L470 AbstractCegarLoop]: Abstraction has 19880 states and 25171 transitions. [2021-11-23 02:09:42,454 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 48.333333333333336) internal successors, (145), 2 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:42,454 INFO L276 IsEmpty]: Start isEmpty. Operand 19880 states and 25171 transitions. [2021-11-23 02:09:42,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 267 [2021-11-23 02:09:42,485 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:42,486 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 02:09:42,527 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:42,706 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-23 02:09:42,707 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:42,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:42,707 INFO L85 PathProgramCache]: Analyzing trace with hash -612891310, now seen corresponding path program 1 times [2021-11-23 02:09:42,708 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:42,708 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1333233842] [2021-11-23 02:09:42,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:42,708 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:42,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:42,920 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 150 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:09:42,921 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:42,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1333233842] [2021-11-23 02:09:42,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1333233842] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:42,921 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:09:42,922 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:09:42,924 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438167718] [2021-11-23 02:09:42,925 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:42,926 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:09:42,926 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:42,927 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:09:42,927 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:09:42,928 INFO L87 Difference]: Start difference. First operand 19880 states and 25171 transitions. Second operand has 4 states, 4 states have (on average 62.0) internal successors, (248), 3 states have internal predecessors, (248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:44,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:44,050 INFO L93 Difference]: Finished difference Result 40617 states and 51541 transitions. [2021-11-23 02:09:44,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:09:44,050 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 62.0) internal successors, (248), 3 states have internal predecessors, (248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 266 [2021-11-23 02:09:44,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:44,091 INFO L225 Difference]: With dead ends: 40617 [2021-11-23 02:09:44,091 INFO L226 Difference]: Without dead ends: 19737 [2021-11-23 02:09:44,106 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:09:44,107 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 453 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 492 mSolverCounterSat, 203 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 453 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 695 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 203 IncrementalHoareTripleChecker+Valid, 492 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:44,107 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [453 Valid, 9 Invalid, 695 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [203 Valid, 492 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-23 02:09:44,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19737 states. [2021-11-23 02:09:44,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19737 to 16591. [2021-11-23 02:09:44,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16591 states, 16590 states have (on average 1.2019288728149489) internal successors, (19940), 16590 states have internal predecessors, (19940), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:44,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16591 states to 16591 states and 19940 transitions. [2021-11-23 02:09:44,546 INFO L78 Accepts]: Start accepts. Automaton has 16591 states and 19940 transitions. Word has length 266 [2021-11-23 02:09:44,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:44,546 INFO L470 AbstractCegarLoop]: Abstraction has 16591 states and 19940 transitions. [2021-11-23 02:09:44,547 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 62.0) internal successors, (248), 3 states have internal predecessors, (248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:44,547 INFO L276 IsEmpty]: Start isEmpty. Operand 16591 states and 19940 transitions. [2021-11-23 02:09:44,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 272 [2021-11-23 02:09:44,564 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:44,564 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 02:09:44,564 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-23 02:09:44,565 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:44,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:44,566 INFO L85 PathProgramCache]: Analyzing trace with hash -1193553047, now seen corresponding path program 1 times [2021-11-23 02:09:44,566 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:44,566 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1341379267] [2021-11-23 02:09:44,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:44,567 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:44,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:44,870 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 127 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:09:44,870 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:44,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1341379267] [2021-11-23 02:09:44,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1341379267] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:44,871 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:09:44,871 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:09:44,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441890648] [2021-11-23 02:09:44,872 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:44,873 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:09:44,873 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:44,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:09:44,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:09:44,874 INFO L87 Difference]: Start difference. First operand 16591 states and 19940 transitions. Second operand has 3 states, 3 states have (on average 88.66666666666667) internal successors, (266), 3 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:45,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:45,749 INFO L93 Difference]: Finished difference Result 34325 states and 40856 transitions. [2021-11-23 02:09:45,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:09:45,749 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 88.66666666666667) internal successors, (266), 3 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 271 [2021-11-23 02:09:45,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:45,779 INFO L225 Difference]: With dead ends: 34325 [2021-11-23 02:09:45,779 INFO L226 Difference]: Without dead ends: 17735 [2021-11-23 02:09:45,791 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 02:09:45,792 INFO L933 BasicCegarLoop]: 173 mSDtfsCounter, 11 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 386 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 480 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:45,792 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 177 Invalid, 480 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 386 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:09:45,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17735 states. [2021-11-23 02:09:46,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17735 to 17020. [2021-11-23 02:09:46,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17020 states, 17019 states have (on average 1.1614078382983724) internal successors, (19766), 17019 states have internal predecessors, (19766), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:46,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17020 states to 17020 states and 19766 transitions. [2021-11-23 02:09:46,281 INFO L78 Accepts]: Start accepts. Automaton has 17020 states and 19766 transitions. Word has length 271 [2021-11-23 02:09:46,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:46,282 INFO L470 AbstractCegarLoop]: Abstraction has 17020 states and 19766 transitions. [2021-11-23 02:09:46,282 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 88.66666666666667) internal successors, (266), 3 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:46,282 INFO L276 IsEmpty]: Start isEmpty. Operand 17020 states and 19766 transitions. [2021-11-23 02:09:46,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 291 [2021-11-23 02:09:46,310 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:46,310 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 02:09:46,311 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-23 02:09:46,311 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:46,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:46,312 INFO L85 PathProgramCache]: Analyzing trace with hash 125350952, now seen corresponding path program 1 times [2021-11-23 02:09:46,313 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:46,313 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [746898359] [2021-11-23 02:09:46,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:46,313 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:46,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:46,594 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 171 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:09:46,594 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:46,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [746898359] [2021-11-23 02:09:46,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [746898359] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:46,595 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:09:46,595 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:09:46,596 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076268511] [2021-11-23 02:09:46,596 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:46,597 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:09:46,597 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:46,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:09:46,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:09:46,598 INFO L87 Difference]: Start difference. First operand 17020 states and 19766 transitions. Second operand has 3 states, 3 states have (on average 95.0) internal successors, (285), 3 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:47,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:47,515 INFO L93 Difference]: Finished difference Result 35612 states and 41424 transitions. [2021-11-23 02:09:47,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:09:47,516 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 95.0) internal successors, (285), 3 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 290 [2021-11-23 02:09:47,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:47,546 INFO L225 Difference]: With dead ends: 35612 [2021-11-23 02:09:47,546 INFO L226 Difference]: Without dead ends: 18736 [2021-11-23 02:09:47,558 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 02:09:47,559 INFO L933 BasicCegarLoop]: 172 mSDtfsCounter, 141 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 370 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 370 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:47,560 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [141 Valid, 175 Invalid, 491 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 370 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 02:09:47,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18736 states. [2021-11-23 02:09:47,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18736 to 16162. [2021-11-23 02:09:47,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16162 states, 16161 states have (on average 1.149248190087247) internal successors, (18573), 16161 states have internal predecessors, (18573), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:48,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16162 states to 16162 states and 18573 transitions. [2021-11-23 02:09:48,016 INFO L78 Accepts]: Start accepts. Automaton has 16162 states and 18573 transitions. Word has length 290 [2021-11-23 02:09:48,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:48,017 INFO L470 AbstractCegarLoop]: Abstraction has 16162 states and 18573 transitions. [2021-11-23 02:09:48,017 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 95.0) internal successors, (285), 3 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:48,017 INFO L276 IsEmpty]: Start isEmpty. Operand 16162 states and 18573 transitions. [2021-11-23 02:09:48,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2021-11-23 02:09:48,036 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:48,037 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 02:09:48,037 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-23 02:09:48,037 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:48,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:48,038 INFO L85 PathProgramCache]: Analyzing trace with hash 1500835743, now seen corresponding path program 1 times [2021-11-23 02:09:48,038 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:48,039 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [899433092] [2021-11-23 02:09:48,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:48,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:48,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:48,203 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 99 proven. 6 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2021-11-23 02:09:48,203 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:48,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [899433092] [2021-11-23 02:09:48,203 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [899433092] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:09:48,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1357335810] [2021-11-23 02:09:48,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:48,204 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:48,204 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:48,212 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:48,232 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:09:48,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:48,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 596 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:09:48,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:49,358 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 224 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 02:09:49,359 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:09:49,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1357335810] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:49,359 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:09:49,360 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-23 02:09:49,360 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472386410] [2021-11-23 02:09:49,361 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:49,362 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:09:49,362 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:49,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:09:49,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:09:49,363 INFO L87 Difference]: Start difference. First operand 16162 states and 18573 transitions. Second operand has 3 states, 3 states have (on average 96.33333333333333) internal successors, (289), 3 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:50,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:50,280 INFO L93 Difference]: Finished difference Result 33324 states and 38327 transitions. [2021-11-23 02:09:50,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:09:50,280 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 96.33333333333333) internal successors, (289), 3 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 324 [2021-11-23 02:09:50,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:50,297 INFO L225 Difference]: With dead ends: 33324 [2021-11-23 02:09:50,297 INFO L226 Difference]: Without dead ends: 17735 [2021-11-23 02:09:50,307 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 326 GetRequests, 323 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:09:50,308 INFO L933 BasicCegarLoop]: 195 mSDtfsCounter, 140 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 409 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 460 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 409 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:50,309 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [140 Valid, 199 Invalid, 460 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 409 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 02:09:50,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17735 states. [2021-11-23 02:09:50,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17735 to 17020. [2021-11-23 02:09:50,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17020 states, 17019 states have (on average 1.1507726658440567) internal successors, (19585), 17019 states have internal predecessors, (19585), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:50,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17020 states to 17020 states and 19585 transitions. [2021-11-23 02:09:50,700 INFO L78 Accepts]: Start accepts. Automaton has 17020 states and 19585 transitions. Word has length 324 [2021-11-23 02:09:50,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:50,701 INFO L470 AbstractCegarLoop]: Abstraction has 17020 states and 19585 transitions. [2021-11-23 02:09:50,702 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 96.33333333333333) internal successors, (289), 3 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:50,702 INFO L276 IsEmpty]: Start isEmpty. Operand 17020 states and 19585 transitions. [2021-11-23 02:09:50,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2021-11-23 02:09:50,727 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:50,731 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 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 02:09:50,770 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:50,956 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-23 02:09:50,956 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:50,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:50,957 INFO L85 PathProgramCache]: Analyzing trace with hash -58552367, now seen corresponding path program 1 times [2021-11-23 02:09:50,957 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:50,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1297081141] [2021-11-23 02:09:50,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:50,958 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:51,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:51,277 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 218 proven. 18 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 02:09:51,277 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:51,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1297081141] [2021-11-23 02:09:51,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1297081141] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:09:51,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1793487435] [2021-11-23 02:09:51,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:51,279 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:51,279 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:51,280 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:51,304 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eafdcd4-9265-4ea8-bdb7-d77940dab347/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:09:51,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:51,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 597 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:09:51,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:52,294 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 205 proven. 40 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:09:52,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:53,113 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 205 proven. 40 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:09:53,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1793487435] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:53,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2043189499] [2021-11-23 02:09:53,154 INFO L159 IcfgInterpreter]: Started Sifa with 145 locations of interest [2021-11-23 02:09:53,154 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:09:53,160 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:09:53,167 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:09:53,167 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs