./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.05.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5e519f3a Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.05.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI --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 16e147b68a860b93a665f8bd36a316225675cf186d50a72fc3242bc6ec552f78 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-5e519f3 [2022-11-03 01:55:18,396 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 01:55:18,398 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 01:55:18,422 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 01:55:18,423 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 01:55:18,424 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 01:55:18,425 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 01:55:18,427 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 01:55:18,429 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 01:55:18,430 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 01:55:18,431 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 01:55:18,432 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 01:55:18,432 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 01:55:18,433 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 01:55:18,435 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 01:55:18,436 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 01:55:18,437 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 01:55:18,438 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 01:55:18,439 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 01:55:18,441 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 01:55:18,443 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 01:55:18,449 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 01:55:18,453 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 01:55:18,454 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 01:55:18,460 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 01:55:18,469 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 01:55:18,469 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 01:55:18,471 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 01:55:18,471 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 01:55:18,472 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 01:55:18,473 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 01:55:18,474 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 01:55:18,475 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 01:55:18,475 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 01:55:18,477 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 01:55:18,478 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 01:55:18,478 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 01:55:18,479 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 01:55:18,479 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 01:55:18,480 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 01:55:18,481 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 01:55:18,482 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-03 01:55:18,502 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 01:55:18,503 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 01:55:18,503 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 01:55:18,503 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 01:55:18,504 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 01:55:18,504 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 01:55:18,504 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 01:55:18,505 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 01:55:18,505 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 01:55:18,505 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 01:55:18,505 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 01:55:18,506 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 01:55:18,506 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 01:55:18,506 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 01:55:18,506 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 01:55:18,507 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 01:55:18,507 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 01:55:18,507 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 01:55:18,508 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 01:55:18,508 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 01:55:18,508 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 01:55:18,508 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 01:55:18,509 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 01:55:18,509 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-03 01:55:18,509 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 01:55:18,509 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-03 01:55:18,509 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 01:55:18,510 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-03 01:55:18,510 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 01:55:18,510 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-03 01:55:18,510 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 01:55:18,511 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 01:55:18,511 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 01:55:18,511 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 01:55:18,511 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 01:55:18,512 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 01:55:18,512 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-03 01:55:18,512 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 01:55:18,512 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 01:55:18,512 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-03 01:55:18,513 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 01:55:18,513 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 16e147b68a860b93a665f8bd36a316225675cf186d50a72fc3242bc6ec552f78 [2022-11-03 01:55:18,779 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 01:55:18,811 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 01:55:18,813 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 01:55:18,823 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 01:55:18,824 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 01:55:18,825 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/systemc/token_ring.05.cil-2.c [2022-11-03 01:55:18,885 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/data/c1fb9b586/dac9dc20e7ec47b5b77891e6daa91884/FLAGc05628c92 [2022-11-03 01:55:19,398 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 01:55:19,398 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/sv-benchmarks/c/systemc/token_ring.05.cil-2.c [2022-11-03 01:55:19,414 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/data/c1fb9b586/dac9dc20e7ec47b5b77891e6daa91884/FLAGc05628c92 [2022-11-03 01:55:19,728 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/data/c1fb9b586/dac9dc20e7ec47b5b77891e6daa91884 [2022-11-03 01:55:19,732 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 01:55:19,734 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 01:55:19,737 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 01:55:19,737 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 01:55:19,741 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 01:55:19,742 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 01:55:19" (1/1) ... [2022-11-03 01:55:19,744 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d657a98 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:19, skipping insertion in model container [2022-11-03 01:55:19,744 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 01:55:19" (1/1) ... [2022-11-03 01:55:19,752 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 01:55:19,806 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 01:55:20,029 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_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/sv-benchmarks/c/systemc/token_ring.05.cil-2.c[671,684] [2022-11-03 01:55:20,149 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 01:55:20,163 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 01:55:20,173 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_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/sv-benchmarks/c/systemc/token_ring.05.cil-2.c[671,684] [2022-11-03 01:55:20,214 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 01:55:20,232 INFO L208 MainTranslator]: Completed translation [2022-11-03 01:55:20,233 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:20 WrapperNode [2022-11-03 01:55:20,233 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 01:55:20,234 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 01:55:20,234 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 01:55:20,234 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 01:55:20,244 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:20" (1/1) ... [2022-11-03 01:55:20,267 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:20" (1/1) ... [2022-11-03 01:55:20,332 INFO L138 Inliner]: procedures = 38, calls = 47, calls flagged for inlining = 21, calls inlined = 21, statements flattened = 452 [2022-11-03 01:55:20,334 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 01:55:20,335 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 01:55:20,336 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 01:55:20,336 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 01:55:20,344 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:20" (1/1) ... [2022-11-03 01:55:20,345 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:20" (1/1) ... [2022-11-03 01:55:20,354 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:20" (1/1) ... [2022-11-03 01:55:20,358 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:20" (1/1) ... [2022-11-03 01:55:20,365 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:20" (1/1) ... [2022-11-03 01:55:20,391 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:20" (1/1) ... [2022-11-03 01:55:20,393 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:20" (1/1) ... [2022-11-03 01:55:20,394 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:20" (1/1) ... [2022-11-03 01:55:20,397 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 01:55:20,398 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 01:55:20,398 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 01:55:20,399 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 01:55:20,400 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:20" (1/1) ... [2022-11-03 01:55:20,405 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 01:55:20,417 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:55:20,428 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 01:55:20,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 01:55:20,483 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-03 01:55:20,484 INFO L130 BoogieDeclarations]: Found specification of procedure error [2022-11-03 01:55:20,484 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2022-11-03 01:55:20,485 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2022-11-03 01:55:20,485 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2022-11-03 01:55:20,485 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2022-11-03 01:55:20,485 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2022-11-03 01:55:20,485 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2022-11-03 01:55:20,485 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2022-11-03 01:55:20,485 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2022-11-03 01:55:20,486 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2022-11-03 01:55:20,486 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2022-11-03 01:55:20,486 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2022-11-03 01:55:20,486 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-03 01:55:20,486 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2022-11-03 01:55:20,486 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2022-11-03 01:55:20,486 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 01:55:20,486 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 01:55:20,603 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 01:55:20,607 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 01:55:21,206 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 01:55:21,591 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 01:55:21,591 INFO L300 CfgBuilder]: Removed 8 assume(true) statements. [2022-11-03 01:55:21,594 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 01:55:21 BoogieIcfgContainer [2022-11-03 01:55:21,594 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 01:55:21,598 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 01:55:21,598 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 01:55:21,601 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 01:55:21,602 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 01:55:19" (1/3) ... [2022-11-03 01:55:21,603 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d7d719e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 01:55:21, skipping insertion in model container [2022-11-03 01:55:21,603 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:20" (2/3) ... [2022-11-03 01:55:21,604 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d7d719e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 01:55:21, skipping insertion in model container [2022-11-03 01:55:21,605 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 01:55:21" (3/3) ... [2022-11-03 01:55:21,608 INFO L112 eAbstractionObserver]: Analyzing ICFG token_ring.05.cil-2.c [2022-11-03 01:55:21,627 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 01:55:21,627 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-03 01:55:21,686 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 01:55:21,701 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@37597627, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 01:55:21,702 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-03 01:55:21,709 INFO L276 IsEmpty]: Start isEmpty. Operand has 117 states, 87 states have (on average 1.5402298850574712) internal successors, (134), 91 states have internal predecessors, (134), 21 states have call successors, (21), 7 states have call predecessors, (21), 7 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2022-11-03 01:55:21,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-03 01:55:21,717 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:55:21,718 INFO L195 NwaCegarLoop]: 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] [2022-11-03 01:55:21,718 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:55:21,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:55:21,722 INFO L85 PathProgramCache]: Analyzing trace with hash 645546722, now seen corresponding path program 1 times [2022-11-03 01:55:21,731 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:55:21,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [943303863] [2022-11-03 01:55:21,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:21,732 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:55:21,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:22,221 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:55:22,222 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:55:22,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [943303863] [2022-11-03 01:55:22,223 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [943303863] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:55:22,223 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 01:55:22,223 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-03 01:55:22,225 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999304731] [2022-11-03 01:55:22,225 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:55:22,231 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 01:55:22,231 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:55:22,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 01:55:22,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 01:55:22,269 INFO L87 Difference]: Start difference. First operand has 117 states, 87 states have (on average 1.5402298850574712) internal successors, (134), 91 states have internal predecessors, (134), 21 states have call successors, (21), 7 states have call predecessors, (21), 7 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) Second operand has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-03 01:55:22,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:55:22,702 INFO L93 Difference]: Finished difference Result 327 states and 510 transitions. [2022-11-03 01:55:22,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 01:55:22,705 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 46 [2022-11-03 01:55:22,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:55:22,727 INFO L225 Difference]: With dead ends: 327 [2022-11-03 01:55:22,727 INFO L226 Difference]: Without dead ends: 211 [2022-11-03 01:55:22,737 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 01:55:22,743 INFO L413 NwaCegarLoop]: 251 mSDtfsCounter, 285 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 188 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 285 SdHoareTripleChecker+Valid, 430 SdHoareTripleChecker+Invalid, 201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 188 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 01:55:22,744 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [285 Valid, 430 Invalid, 201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 188 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 01:55:22,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2022-11-03 01:55:22,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 210. [2022-11-03 01:55:22,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 161 states have (on average 1.453416149068323) internal successors, (234), 164 states have internal predecessors, (234), 36 states have call successors, (36), 13 states have call predecessors, (36), 12 states have return successors, (34), 33 states have call predecessors, (34), 34 states have call successors, (34) [2022-11-03 01:55:22,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 304 transitions. [2022-11-03 01:55:22,814 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 304 transitions. Word has length 46 [2022-11-03 01:55:22,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:55:22,814 INFO L495 AbstractCegarLoop]: Abstraction has 210 states and 304 transitions. [2022-11-03 01:55:22,816 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-03 01:55:22,816 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 304 transitions. [2022-11-03 01:55:22,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-11-03 01:55:22,827 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:55:22,828 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:55:22,828 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-03 01:55:22,829 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:55:22,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:55:22,829 INFO L85 PathProgramCache]: Analyzing trace with hash -708308639, now seen corresponding path program 1 times [2022-11-03 01:55:22,830 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:55:22,830 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [506412046] [2022-11-03 01:55:22,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:22,830 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:55:22,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:23,147 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 01:55:23,148 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:55:23,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [506412046] [2022-11-03 01:55:23,148 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [506412046] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:55:23,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2118796140] [2022-11-03 01:55:23,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:23,149 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:55:23,149 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:55:23,151 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:55:23,158 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-03 01:55:23,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:23,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 527 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 01:55:23,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:55:23,433 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 01:55:23,433 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 01:55:23,434 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2118796140] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:55:23,434 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 01:55:23,435 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-03 01:55:23,436 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345037740] [2022-11-03 01:55:23,438 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:55:23,439 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 01:55:23,439 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:55:23,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 01:55:23,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 01:55:23,441 INFO L87 Difference]: Start difference. First operand 210 states and 304 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 2 states have internal predecessors, (62), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-03 01:55:23,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:55:23,560 INFO L93 Difference]: Finished difference Result 613 states and 901 transitions. [2022-11-03 01:55:23,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 01:55:23,561 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 2 states have internal predecessors, (62), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 87 [2022-11-03 01:55:23,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:55:23,565 INFO L225 Difference]: With dead ends: 613 [2022-11-03 01:55:23,565 INFO L226 Difference]: Without dead ends: 408 [2022-11-03 01:55:23,566 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 01:55:23,568 INFO L413 NwaCegarLoop]: 183 mSDtfsCounter, 134 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:55:23,568 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [134 Valid, 310 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:55:23,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2022-11-03 01:55:23,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 402. [2022-11-03 01:55:23,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 402 states, 313 states have (on average 1.4472843450479234) internal successors, (453), 317 states have internal predecessors, (453), 64 states have call successors, (64), 25 states have call predecessors, (64), 24 states have return successors, (62), 60 states have call predecessors, (62), 62 states have call successors, (62) [2022-11-03 01:55:23,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 579 transitions. [2022-11-03 01:55:23,607 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 579 transitions. Word has length 87 [2022-11-03 01:55:23,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:55:23,607 INFO L495 AbstractCegarLoop]: Abstraction has 402 states and 579 transitions. [2022-11-03 01:55:23,608 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 2 states have internal predecessors, (62), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-03 01:55:23,608 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 579 transitions. [2022-11-03 01:55:23,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-11-03 01:55:23,610 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:55:23,610 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:55:23,646 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-03 01:55:23,824 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:55:23,824 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:55:23,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:55:23,825 INFO L85 PathProgramCache]: Analyzing trace with hash 1750201759, now seen corresponding path program 1 times [2022-11-03 01:55:23,825 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:55:23,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [866518815] [2022-11-03 01:55:23,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:23,826 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:55:23,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:24,046 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 01:55:24,046 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:55:24,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [866518815] [2022-11-03 01:55:24,047 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [866518815] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:55:24,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1611296732] [2022-11-03 01:55:24,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:24,052 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:55:24,052 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:55:24,054 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:55:24,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-03 01:55:24,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:24,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 521 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 01:55:24,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:55:24,291 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-03 01:55:24,292 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 01:55:24,292 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1611296732] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:55:24,292 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 01:55:24,292 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-03 01:55:24,293 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [185577288] [2022-11-03 01:55:24,293 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:55:24,293 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 01:55:24,294 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:55:24,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 01:55:24,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 01:55:24,295 INFO L87 Difference]: Start difference. First operand 402 states and 579 transitions. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 2 states have internal predecessors, (56), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-03 01:55:24,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:55:24,420 INFO L93 Difference]: Finished difference Result 1183 states and 1730 transitions. [2022-11-03 01:55:24,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 01:55:24,420 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 2 states have internal predecessors, (56), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 87 [2022-11-03 01:55:24,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:55:24,425 INFO L225 Difference]: With dead ends: 1183 [2022-11-03 01:55:24,425 INFO L226 Difference]: Without dead ends: 786 [2022-11-03 01:55:24,427 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 01:55:24,428 INFO L413 NwaCegarLoop]: 182 mSDtfsCounter, 140 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:55:24,428 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [140 Valid, 309 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:55:24,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 786 states. [2022-11-03 01:55:24,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 786 to 778. [2022-11-03 01:55:24,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 778 states, 611 states have (on average 1.4386252045826513) internal successors, (879), 617 states have internal predecessors, (879), 118 states have call successors, (118), 49 states have call predecessors, (118), 48 states have return successors, (116), 112 states have call predecessors, (116), 116 states have call successors, (116) [2022-11-03 01:55:24,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 778 states to 778 states and 1113 transitions. [2022-11-03 01:55:24,488 INFO L78 Accepts]: Start accepts. Automaton has 778 states and 1113 transitions. Word has length 87 [2022-11-03 01:55:24,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:55:24,489 INFO L495 AbstractCegarLoop]: Abstraction has 778 states and 1113 transitions. [2022-11-03 01:55:24,489 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 2 states have internal predecessors, (56), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-03 01:55:24,489 INFO L276 IsEmpty]: Start isEmpty. Operand 778 states and 1113 transitions. [2022-11-03 01:55:24,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-11-03 01:55:24,492 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:55:24,492 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:55:24,529 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-03 01:55:24,718 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:55:24,718 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:55:24,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:55:24,719 INFO L85 PathProgramCache]: Analyzing trace with hash 212022109, now seen corresponding path program 1 times [2022-11-03 01:55:24,719 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:55:24,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [758577611] [2022-11-03 01:55:24,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:24,719 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:55:24,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:24,846 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 01:55:24,846 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:55:24,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [758577611] [2022-11-03 01:55:24,847 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [758577611] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:55:24,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1380554456] [2022-11-03 01:55:24,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:24,853 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:55:24,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:55:24,854 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:55:24,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-03 01:55:25,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:25,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 515 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 01:55:25,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:55:25,088 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-03 01:55:25,090 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 01:55:25,090 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1380554456] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:55:25,090 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 01:55:25,091 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-03 01:55:25,091 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [454714278] [2022-11-03 01:55:25,091 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:55:25,093 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 01:55:25,093 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:55:25,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 01:55:25,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 01:55:25,094 INFO L87 Difference]: Start difference. First operand 778 states and 1113 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 states have internal predecessors, (53), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-03 01:55:25,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:55:25,283 INFO L93 Difference]: Finished difference Result 2299 states and 3338 transitions. [2022-11-03 01:55:25,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 01:55:25,286 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 states have internal predecessors, (53), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 87 [2022-11-03 01:55:25,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:55:25,298 INFO L225 Difference]: With dead ends: 2299 [2022-11-03 01:55:25,299 INFO L226 Difference]: Without dead ends: 1526 [2022-11-03 01:55:25,301 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 01:55:25,304 INFO L413 NwaCegarLoop]: 181 mSDtfsCounter, 143 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 308 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:55:25,305 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [143 Valid, 308 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:55:25,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1526 states. [2022-11-03 01:55:25,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1526 to 1514. [2022-11-03 01:55:25,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1514 states, 1195 states have (on average 1.4284518828451882) internal successors, (1707), 1205 states have internal predecessors, (1707), 222 states have call successors, (222), 97 states have call predecessors, (222), 96 states have return successors, (220), 212 states have call predecessors, (220), 220 states have call successors, (220) [2022-11-03 01:55:25,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1514 states to 1514 states and 2149 transitions. [2022-11-03 01:55:25,430 INFO L78 Accepts]: Start accepts. Automaton has 1514 states and 2149 transitions. Word has length 87 [2022-11-03 01:55:25,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:55:25,431 INFO L495 AbstractCegarLoop]: Abstraction has 1514 states and 2149 transitions. [2022-11-03 01:55:25,431 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 states have internal predecessors, (53), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-03 01:55:25,431 INFO L276 IsEmpty]: Start isEmpty. Operand 1514 states and 2149 transitions. [2022-11-03 01:55:25,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-11-03 01:55:25,436 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:55:25,436 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:55:25,477 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-03 01:55:25,650 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:55:25,650 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:55:25,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:55:25,651 INFO L85 PathProgramCache]: Analyzing trace with hash -691850017, now seen corresponding path program 1 times [2022-11-03 01:55:25,651 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:55:25,651 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2115162617] [2022-11-03 01:55:25,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:25,651 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:55:25,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:25,746 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-03 01:55:25,746 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:55:25,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2115162617] [2022-11-03 01:55:25,746 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2115162617] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:55:25,746 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 01:55:25,747 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 01:55:25,747 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953406922] [2022-11-03 01:55:25,747 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:55:25,747 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 01:55:25,748 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:55:25,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 01:55:25,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 01:55:25,748 INFO L87 Difference]: Start difference. First operand 1514 states and 2149 transitions. Second operand has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-03 01:55:25,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:55:25,898 INFO L93 Difference]: Finished difference Result 2694 states and 3880 transitions. [2022-11-03 01:55:25,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 01:55:25,899 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 87 [2022-11-03 01:55:25,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:55:25,912 INFO L225 Difference]: With dead ends: 2694 [2022-11-03 01:55:25,912 INFO L226 Difference]: Without dead ends: 1906 [2022-11-03 01:55:25,917 INFO L412 NwaCegarLoop]: 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 [2022-11-03 01:55:25,918 INFO L413 NwaCegarLoop]: 204 mSDtfsCounter, 64 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 346 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:55:25,918 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [64 Valid, 346 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:55:25,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1906 states. [2022-11-03 01:55:26,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1906 to 1758. [2022-11-03 01:55:26,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1758 states, 1423 states have (on average 1.4694307800421644) internal successors, (2091), 1433 states have internal predecessors, (2091), 230 states have call successors, (230), 105 states have call predecessors, (230), 104 states have return successors, (228), 220 states have call predecessors, (228), 228 states have call successors, (228) [2022-11-03 01:55:26,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1758 states to 1758 states and 2549 transitions. [2022-11-03 01:55:26,033 INFO L78 Accepts]: Start accepts. Automaton has 1758 states and 2549 transitions. Word has length 87 [2022-11-03 01:55:26,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:55:26,035 INFO L495 AbstractCegarLoop]: Abstraction has 1758 states and 2549 transitions. [2022-11-03 01:55:26,035 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-03 01:55:26,035 INFO L276 IsEmpty]: Start isEmpty. Operand 1758 states and 2549 transitions. [2022-11-03 01:55:26,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-11-03 01:55:26,047 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:55:26,047 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:55:26,047 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-03 01:55:26,047 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:55:26,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:55:26,048 INFO L85 PathProgramCache]: Analyzing trace with hash -91305985, now seen corresponding path program 1 times [2022-11-03 01:55:26,048 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:55:26,048 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [863211888] [2022-11-03 01:55:26,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:26,049 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:55:26,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:26,159 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2022-11-03 01:55:26,159 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:55:26,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [863211888] [2022-11-03 01:55:26,159 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [863211888] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:55:26,161 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 01:55:26,161 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 01:55:26,161 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812855336] [2022-11-03 01:55:26,161 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:55:26,162 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 01:55:26,162 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:55:26,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 01:55:26,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 01:55:26,163 INFO L87 Difference]: Start difference. First operand 1758 states and 2549 transitions. Second operand has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-03 01:55:26,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:55:26,400 INFO L93 Difference]: Finished difference Result 5191 states and 7606 transitions. [2022-11-03 01:55:26,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 01:55:26,401 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 116 [2022-11-03 01:55:26,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:55:26,418 INFO L225 Difference]: With dead ends: 5191 [2022-11-03 01:55:26,418 INFO L226 Difference]: Without dead ends: 3438 [2022-11-03 01:55:26,424 INFO L412 NwaCegarLoop]: 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 [2022-11-03 01:55:26,425 INFO L413 NwaCegarLoop]: 152 mSDtfsCounter, 134 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:55:26,425 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [134 Valid, 279 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:55:26,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3438 states. [2022-11-03 01:55:26,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3438 to 3410. [2022-11-03 01:55:26,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3410 states, 2763 states have (on average 1.4545783568584871) internal successors, (4019), 2781 states have internal predecessors, (4019), 438 states have call successors, (438), 209 states have call predecessors, (438), 208 states have return successors, (436), 420 states have call predecessors, (436), 436 states have call successors, (436) [2022-11-03 01:55:26,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3410 states to 3410 states and 4893 transitions. [2022-11-03 01:55:26,627 INFO L78 Accepts]: Start accepts. Automaton has 3410 states and 4893 transitions. Word has length 116 [2022-11-03 01:55:26,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:55:26,627 INFO L495 AbstractCegarLoop]: Abstraction has 3410 states and 4893 transitions. [2022-11-03 01:55:26,627 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-03 01:55:26,628 INFO L276 IsEmpty]: Start isEmpty. Operand 3410 states and 4893 transitions. [2022-11-03 01:55:26,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-11-03 01:55:26,637 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:55:26,637 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:55:26,637 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-03 01:55:26,638 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:55:26,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:55:26,638 INFO L85 PathProgramCache]: Analyzing trace with hash 2145552429, now seen corresponding path program 1 times [2022-11-03 01:55:26,638 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:55:26,639 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429505971] [2022-11-03 01:55:26,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:26,639 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:55:26,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:26,751 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2022-11-03 01:55:26,751 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:55:26,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429505971] [2022-11-03 01:55:26,751 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [429505971] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:55:26,751 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 01:55:26,751 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 01:55:26,752 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536973300] [2022-11-03 01:55:26,752 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:55:26,752 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 01:55:26,752 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:55:26,753 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 01:55:26,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 01:55:26,753 INFO L87 Difference]: Start difference. First operand 3410 states and 4893 transitions. Second operand has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-03 01:55:27,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:55:27,153 INFO L93 Difference]: Finished difference Result 10075 states and 14598 transitions. [2022-11-03 01:55:27,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 01:55:27,154 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 116 [2022-11-03 01:55:27,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:55:27,184 INFO L225 Difference]: With dead ends: 10075 [2022-11-03 01:55:27,184 INFO L226 Difference]: Without dead ends: 6670 [2022-11-03 01:55:27,194 INFO L412 NwaCegarLoop]: 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 [2022-11-03 01:55:27,195 INFO L413 NwaCegarLoop]: 167 mSDtfsCounter, 137 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:55:27,195 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [137 Valid, 294 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:55:27,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6670 states. [2022-11-03 01:55:27,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6670 to 6618. [2022-11-03 01:55:27,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6618 states, 5363 states have (on average 1.438560507178818) internal successors, (7715), 5397 states have internal predecessors, (7715), 838 states have call successors, (838), 417 states have call predecessors, (838), 416 states have return successors, (836), 804 states have call predecessors, (836), 836 states have call successors, (836) [2022-11-03 01:55:27,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6618 states to 6618 states and 9389 transitions. [2022-11-03 01:55:27,560 INFO L78 Accepts]: Start accepts. Automaton has 6618 states and 9389 transitions. Word has length 116 [2022-11-03 01:55:27,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:55:27,560 INFO L495 AbstractCegarLoop]: Abstraction has 6618 states and 9389 transitions. [2022-11-03 01:55:27,561 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-03 01:55:27,561 INFO L276 IsEmpty]: Start isEmpty. Operand 6618 states and 9389 transitions. [2022-11-03 01:55:27,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2022-11-03 01:55:27,581 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:55:27,582 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:55:27,582 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-11-03 01:55:27,582 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:55:27,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:55:27,583 INFO L85 PathProgramCache]: Analyzing trace with hash -1173415332, now seen corresponding path program 1 times [2022-11-03 01:55:27,583 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:55:27,583 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629357583] [2022-11-03 01:55:27,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:27,583 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:55:27,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:27,665 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2022-11-03 01:55:27,665 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:55:27,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1629357583] [2022-11-03 01:55:27,665 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1629357583] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:55:27,665 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 01:55:27,666 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 01:55:27,666 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824144799] [2022-11-03 01:55:27,666 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:55:27,666 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 01:55:27,666 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:55:27,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 01:55:27,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 01:55:27,667 INFO L87 Difference]: Start difference. First operand 6618 states and 9389 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-03 01:55:28,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:55:28,334 INFO L93 Difference]: Finished difference Result 17410 states and 25107 transitions. [2022-11-03 01:55:28,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 01:55:28,335 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 134 [2022-11-03 01:55:28,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:55:28,413 INFO L225 Difference]: With dead ends: 17410 [2022-11-03 01:55:28,419 INFO L226 Difference]: Without dead ends: 10798 [2022-11-03 01:55:28,436 INFO L412 NwaCegarLoop]: 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 [2022-11-03 01:55:28,437 INFO L413 NwaCegarLoop]: 182 mSDtfsCounter, 82 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 322 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:55:28,437 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [82 Valid, 322 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:55:28,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10798 states. [2022-11-03 01:55:29,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10798 to 9138. [2022-11-03 01:55:29,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9138 states, 7687 states have (on average 1.5037075582151684) internal successors, (11559), 7722 states have internal predecessors, (11559), 936 states have call successors, (936), 515 states have call predecessors, (936), 514 states have return successors, (934), 901 states have call predecessors, (934), 934 states have call successors, (934) [2022-11-03 01:55:29,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9138 states to 9138 states and 13429 transitions. [2022-11-03 01:55:29,093 INFO L78 Accepts]: Start accepts. Automaton has 9138 states and 13429 transitions. Word has length 134 [2022-11-03 01:55:29,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:55:29,095 INFO L495 AbstractCegarLoop]: Abstraction has 9138 states and 13429 transitions. [2022-11-03 01:55:29,096 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-03 01:55:29,096 INFO L276 IsEmpty]: Start isEmpty. Operand 9138 states and 13429 transitions. [2022-11-03 01:55:29,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2022-11-03 01:55:29,122 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:55:29,122 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:55:29,122 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-11-03 01:55:29,122 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:55:29,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:55:29,123 INFO L85 PathProgramCache]: Analyzing trace with hash 1988559096, now seen corresponding path program 2 times [2022-11-03 01:55:29,123 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:55:29,123 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [971291999] [2022-11-03 01:55:29,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:29,123 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:55:29,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:29,287 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2022-11-03 01:55:29,288 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:55:29,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [971291999] [2022-11-03 01:55:29,288 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [971291999] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:55:29,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1032615054] [2022-11-03 01:55:29,288 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 01:55:29,289 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:55:29,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:55:29,290 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:55:29,321 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-03 01:55:29,474 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 01:55:29,474 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 01:55:29,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 698 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 01:55:29,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:55:29,508 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 70 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-03 01:55:29,508 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 01:55:29,508 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1032615054] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:55:29,508 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 01:55:29,508 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2022-11-03 01:55:29,509 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648885181] [2022-11-03 01:55:29,509 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:55:29,509 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 01:55:29,509 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:55:29,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 01:55:29,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-03 01:55:29,510 INFO L87 Difference]: Start difference. First operand 9138 states and 13429 transitions. Second operand has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-11-03 01:55:30,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:55:30,207 INFO L93 Difference]: Finished difference Result 17402 states and 25787 transitions. [2022-11-03 01:55:30,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 01:55:30,208 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 134 [2022-11-03 01:55:30,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:55:30,266 INFO L225 Difference]: With dead ends: 17402 [2022-11-03 01:55:30,266 INFO L226 Difference]: Without dead ends: 12742 [2022-11-03 01:55:30,281 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-03 01:55:30,283 INFO L413 NwaCegarLoop]: 228 mSDtfsCounter, 103 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 372 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:55:30,284 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 372 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:55:30,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12742 states. [2022-11-03 01:55:31,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12742 to 11458. [2022-11-03 01:55:31,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11458 states, 9815 states have (on average 1.5298013245033113) internal successors, (15015), 9850 states have internal predecessors, (15015), 1032 states have call successors, (1032), 611 states have call predecessors, (1032), 610 states have return successors, (1030), 997 states have call predecessors, (1030), 1030 states have call successors, (1030) [2022-11-03 01:55:31,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11458 states to 11458 states and 17077 transitions. [2022-11-03 01:55:31,108 INFO L78 Accepts]: Start accepts. Automaton has 11458 states and 17077 transitions. Word has length 134 [2022-11-03 01:55:31,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:55:31,109 INFO L495 AbstractCegarLoop]: Abstraction has 11458 states and 17077 transitions. [2022-11-03 01:55:31,109 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-11-03 01:55:31,158 INFO L276 IsEmpty]: Start isEmpty. Operand 11458 states and 17077 transitions. [2022-11-03 01:55:31,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2022-11-03 01:55:31,186 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:55:31,186 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:55:31,227 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-03 01:55:31,402 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-03 01:55:31,402 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:55:31,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:55:31,403 INFO L85 PathProgramCache]: Analyzing trace with hash -2058694029, now seen corresponding path program 3 times [2022-11-03 01:55:31,403 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:55:31,403 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1550251402] [2022-11-03 01:55:31,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:31,403 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:55:31,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:31,714 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 10 proven. 37 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2022-11-03 01:55:31,715 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:55:31,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1550251402] [2022-11-03 01:55:31,715 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1550251402] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:55:31,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [146215864] [2022-11-03 01:55:31,715 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 01:55:31,716 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:55:31,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:55:31,717 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:55:31,734 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-03 01:55:31,849 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 01:55:31,849 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 01:55:31,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-03 01:55:31,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:55:31,894 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-11-03 01:55:31,894 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 01:55:31,894 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [146215864] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:55:31,895 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 01:55:31,895 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2022-11-03 01:55:31,895 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922837804] [2022-11-03 01:55:31,895 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:55:31,896 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 01:55:31,896 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:55:31,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 01:55:31,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 01:55:31,897 INFO L87 Difference]: Start difference. First operand 11458 states and 17077 transitions. Second operand has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-03 01:55:32,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:55:32,493 INFO L93 Difference]: Finished difference Result 17338 states and 26107 transitions. [2022-11-03 01:55:32,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 01:55:32,494 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 134 [2022-11-03 01:55:32,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:55:32,529 INFO L225 Difference]: With dead ends: 17338 [2022-11-03 01:55:32,529 INFO L226 Difference]: Without dead ends: 11494 [2022-11-03 01:55:32,541 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 01:55:32,542 INFO L413 NwaCegarLoop]: 243 mSDtfsCounter, 140 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 373 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:55:32,543 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [140 Valid, 373 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:55:32,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11494 states. [2022-11-03 01:55:33,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11494 to 11378. [2022-11-03 01:55:33,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11378 states, 9735 states have (on average 1.5160760143810992) internal successors, (14759), 9770 states have internal predecessors, (14759), 1032 states have call successors, (1032), 611 states have call predecessors, (1032), 610 states have return successors, (1030), 997 states have call predecessors, (1030), 1030 states have call successors, (1030) [2022-11-03 01:55:33,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11378 states to 11378 states and 16821 transitions. [2022-11-03 01:55:33,104 INFO L78 Accepts]: Start accepts. Automaton has 11378 states and 16821 transitions. Word has length 134 [2022-11-03 01:55:33,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:55:33,104 INFO L495 AbstractCegarLoop]: Abstraction has 11378 states and 16821 transitions. [2022-11-03 01:55:33,104 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-03 01:55:33,105 INFO L276 IsEmpty]: Start isEmpty. Operand 11378 states and 16821 transitions. [2022-11-03 01:55:33,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2022-11-03 01:55:33,141 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:55:33,141 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:55:33,185 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-03 01:55:33,350 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-03 01:55:33,350 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:55:33,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:55:33,351 INFO L85 PathProgramCache]: Analyzing trace with hash -482136270, now seen corresponding path program 1 times [2022-11-03 01:55:33,351 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:55:33,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [214391451] [2022-11-03 01:55:33,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:33,351 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:55:33,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:33,725 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 10 proven. 36 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-03 01:55:33,725 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:55:33,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [214391451] [2022-11-03 01:55:33,726 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [214391451] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:55:33,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [138817112] [2022-11-03 01:55:33,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:33,726 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:55:33,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:55:33,727 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:55:33,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-03 01:55:33,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:33,898 INFO L263 TraceCheckSpWp]: Trace formula consists of 704 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 01:55:33,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:55:33,940 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 62 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-03 01:55:33,940 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 01:55:33,940 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [138817112] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:55:33,940 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 01:55:33,941 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2022-11-03 01:55:33,943 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637012835] [2022-11-03 01:55:33,943 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:55:33,944 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 01:55:33,944 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:55:33,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 01:55:33,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 01:55:33,945 INFO L87 Difference]: Start difference. First operand 11378 states and 16821 transitions. Second operand has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-03 01:55:34,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:55:34,679 INFO L93 Difference]: Finished difference Result 18760 states and 27402 transitions. [2022-11-03 01:55:34,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 01:55:34,679 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 134 [2022-11-03 01:55:34,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:55:34,725 INFO L225 Difference]: With dead ends: 18760 [2022-11-03 01:55:34,726 INFO L226 Difference]: Without dead ends: 13036 [2022-11-03 01:55:34,741 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 01:55:34,742 INFO L413 NwaCegarLoop]: 155 mSDtfsCounter, 138 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:55:34,742 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [138 Valid, 189 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:55:34,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13036 states. [2022-11-03 01:55:35,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13036 to 13036. [2022-11-03 01:55:35,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13036 states, 11205 states have (on average 1.474074074074074) internal successors, (16517), 11240 states have internal predecessors, (16517), 1094 states have call successors, (1094), 737 states have call predecessors, (1094), 736 states have return successors, (1092), 1059 states have call predecessors, (1092), 1092 states have call successors, (1092) [2022-11-03 01:55:35,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13036 states to 13036 states and 18703 transitions. [2022-11-03 01:55:35,849 INFO L78 Accepts]: Start accepts. Automaton has 13036 states and 18703 transitions. Word has length 134 [2022-11-03 01:55:35,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:55:35,850 INFO L495 AbstractCegarLoop]: Abstraction has 13036 states and 18703 transitions. [2022-11-03 01:55:35,850 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-03 01:55:35,851 INFO L276 IsEmpty]: Start isEmpty. Operand 13036 states and 18703 transitions. [2022-11-03 01:55:35,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2022-11-03 01:55:35,880 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:55:35,881 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:55:35,925 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-03 01:55:36,094 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:55:36,094 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:55:36,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:55:36,095 INFO L85 PathProgramCache]: Analyzing trace with hash -2004337445, now seen corresponding path program 1 times [2022-11-03 01:55:36,095 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:55:36,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [716425550] [2022-11-03 01:55:36,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:36,095 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:55:36,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:36,372 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 10 proven. 35 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2022-11-03 01:55:36,372 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:55:36,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [716425550] [2022-11-03 01:55:36,372 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [716425550] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:55:36,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1564430294] [2022-11-03 01:55:36,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:36,373 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:55:36,373 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:55:36,374 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:55:36,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-03 01:55:36,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:36,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 707 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-03 01:55:36,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:55:36,595 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-03 01:55:36,596 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 01:55:36,596 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1564430294] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:55:36,596 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 01:55:36,596 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2022-11-03 01:55:36,597 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975997585] [2022-11-03 01:55:36,597 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:55:36,598 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 01:55:36,598 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:55:36,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 01:55:36,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 01:55:36,599 INFO L87 Difference]: Start difference. First operand 13036 states and 18703 transitions. Second operand has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-03 01:55:37,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:55:37,744 INFO L93 Difference]: Finished difference Result 32088 states and 46680 transitions. [2022-11-03 01:55:37,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 01:55:37,745 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 134 [2022-11-03 01:55:37,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:55:37,803 INFO L225 Difference]: With dead ends: 32088 [2022-11-03 01:55:37,804 INFO L226 Difference]: Without dead ends: 19058 [2022-11-03 01:55:37,825 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 01:55:37,826 INFO L413 NwaCegarLoop]: 160 mSDtfsCounter, 72 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 287 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:55:37,826 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 287 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:55:37,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19058 states. [2022-11-03 01:55:38,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19058 to 15468. [2022-11-03 01:55:38,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15468 states, 13445 states have (on average 1.4974339903309781) internal successors, (20133), 13480 states have internal predecessors, (20133), 1190 states have call successors, (1190), 833 states have call predecessors, (1190), 832 states have return successors, (1188), 1155 states have call predecessors, (1188), 1188 states have call successors, (1188) [2022-11-03 01:55:38,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15468 states to 15468 states and 22511 transitions. [2022-11-03 01:55:38,688 INFO L78 Accepts]: Start accepts. Automaton has 15468 states and 22511 transitions. Word has length 134 [2022-11-03 01:55:38,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:55:38,688 INFO L495 AbstractCegarLoop]: Abstraction has 15468 states and 22511 transitions. [2022-11-03 01:55:38,689 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-03 01:55:38,689 INFO L276 IsEmpty]: Start isEmpty. Operand 15468 states and 22511 transitions. [2022-11-03 01:55:38,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-11-03 01:55:38,723 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:55:38,723 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:55:38,763 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-03 01:55:38,938 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:55:38,938 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:55:38,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:55:38,939 INFO L85 PathProgramCache]: Analyzing trace with hash 1425962195, now seen corresponding path program 1 times [2022-11-03 01:55:38,939 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:55:38,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [863211241] [2022-11-03 01:55:38,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:38,939 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:55:38,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:39,269 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 13 proven. 35 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-03 01:55:39,271 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:55:39,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [863211241] [2022-11-03 01:55:39,271 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [863211241] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:55:39,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [213851590] [2022-11-03 01:55:39,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:39,272 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:55:39,272 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:55:39,273 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:55:39,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-03 01:55:39,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:39,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 714 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-03 01:55:39,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:55:39,525 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 74 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-03 01:55:39,525 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 01:55:39,525 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [213851590] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:55:39,526 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 01:55:39,526 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2022-11-03 01:55:39,526 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412063836] [2022-11-03 01:55:39,526 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:55:39,527 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 01:55:39,527 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:55:39,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 01:55:39,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-11-03 01:55:39,528 INFO L87 Difference]: Start difference. First operand 15468 states and 22511 transitions. Second operand has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2022-11-03 01:55:41,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:55:41,402 INFO L93 Difference]: Finished difference Result 45910 states and 66547 transitions. [2022-11-03 01:55:41,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 01:55:41,403 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 135 [2022-11-03 01:55:41,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:55:41,523 INFO L225 Difference]: With dead ends: 45910 [2022-11-03 01:55:41,523 INFO L226 Difference]: Without dead ends: 30448 [2022-11-03 01:55:41,548 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2022-11-03 01:55:41,549 INFO L413 NwaCegarLoop]: 268 mSDtfsCounter, 156 mSDsluCounter, 448 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 156 SdHoareTripleChecker+Valid, 650 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:55:41,550 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [156 Valid, 650 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:55:41,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30448 states. [2022-11-03 01:55:43,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30448 to 30308. [2022-11-03 01:55:43,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30308 states, 26243 states have (on average 1.465800403917235) internal successors, (38467), 26375 states have internal predecessors, (38467), 2339 states have call successors, (2339), 1662 states have call predecessors, (2339), 1725 states have return successors, (2717), 2271 states have call predecessors, (2717), 2337 states have call successors, (2717) [2022-11-03 01:55:43,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30308 states to 30308 states and 43523 transitions. [2022-11-03 01:55:43,368 INFO L78 Accepts]: Start accepts. Automaton has 30308 states and 43523 transitions. Word has length 135 [2022-11-03 01:55:43,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:55:43,369 INFO L495 AbstractCegarLoop]: Abstraction has 30308 states and 43523 transitions. [2022-11-03 01:55:43,369 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2022-11-03 01:55:43,370 INFO L276 IsEmpty]: Start isEmpty. Operand 30308 states and 43523 transitions. [2022-11-03 01:55:43,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-11-03 01:55:43,430 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:55:43,430 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:55:43,470 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-03 01:55:43,646 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-03 01:55:43,646 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:55:43,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:55:43,647 INFO L85 PathProgramCache]: Analyzing trace with hash 2130880882, now seen corresponding path program 2 times [2022-11-03 01:55:43,647 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:55:43,647 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249481727] [2022-11-03 01:55:43,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:43,647 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:55:43,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:43,953 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 13 proven. 36 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2022-11-03 01:55:43,953 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:55:43,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249481727] [2022-11-03 01:55:43,954 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [249481727] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:55:43,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [301548780] [2022-11-03 01:55:43,954 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 01:55:43,954 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:55:43,954 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:55:43,955 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:55:43,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-03 01:55:44,104 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-03 01:55:44,104 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 01:55:44,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 445 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-03 01:55:44,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:55:44,166 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 74 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-03 01:55:44,166 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 01:55:44,166 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [301548780] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:55:44,166 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 01:55:44,166 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2022-11-03 01:55:44,167 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305104341] [2022-11-03 01:55:44,167 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:55:44,167 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 01:55:44,167 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:55:44,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 01:55:44,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 01:55:44,168 INFO L87 Difference]: Start difference. First operand 30308 states and 43523 transitions. Second operand has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-03 01:55:46,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:55:46,653 INFO L93 Difference]: Finished difference Result 60670 states and 88683 transitions. [2022-11-03 01:55:46,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 01:55:46,654 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 135 [2022-11-03 01:55:46,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:55:46,849 INFO L225 Difference]: With dead ends: 60670 [2022-11-03 01:55:46,850 INFO L226 Difference]: Without dead ends: 44928 [2022-11-03 01:55:46,898 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 01:55:46,899 INFO L413 NwaCegarLoop]: 171 mSDtfsCounter, 131 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 297 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:55:46,899 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [131 Valid, 297 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:55:46,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44928 states. [2022-11-03 01:55:49,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44928 to 44472. [2022-11-03 01:55:49,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44472 states, 38431 states have (on average 1.4637922510473316) internal successors, (56255), 38595 states have internal predecessors, (56255), 3487 states have call successors, (3487), 2490 states have call predecessors, (3487), 2553 states have return successors, (4341), 3387 states have call predecessors, (4341), 3485 states have call successors, (4341) [2022-11-03 01:55:49,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44472 states to 44472 states and 64083 transitions. [2022-11-03 01:55:49,327 INFO L78 Accepts]: Start accepts. Automaton has 44472 states and 64083 transitions. Word has length 135 [2022-11-03 01:55:49,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:55:49,328 INFO L495 AbstractCegarLoop]: Abstraction has 44472 states and 64083 transitions. [2022-11-03 01:55:49,328 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-03 01:55:49,328 INFO L276 IsEmpty]: Start isEmpty. Operand 44472 states and 64083 transitions. [2022-11-03 01:55:49,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-11-03 01:55:49,427 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:55:49,427 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:55:49,465 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-03 01:55:49,642 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-03 01:55:49,642 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:55:49,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:55:49,643 INFO L85 PathProgramCache]: Analyzing trace with hash 968755914, now seen corresponding path program 3 times [2022-11-03 01:55:49,643 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:55:49,643 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1464760534] [2022-11-03 01:55:49,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:49,643 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:55:49,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:49,895 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 13 proven. 36 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2022-11-03 01:55:49,895 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:55:49,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1464760534] [2022-11-03 01:55:49,896 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1464760534] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:55:49,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [276404479] [2022-11-03 01:55:49,896 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 01:55:49,896 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:55:49,896 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:55:49,897 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:55:49,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-03 01:55:50,045 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 01:55:50,045 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 01:55:50,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 430 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-03 01:55:50,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:55:50,163 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-03 01:55:50,163 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 01:55:50,163 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [276404479] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:55:50,164 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 01:55:50,164 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2022-11-03 01:55:50,165 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006616193] [2022-11-03 01:55:50,165 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:55:50,166 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 01:55:50,166 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:55:50,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 01:55:50,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 01:55:50,167 INFO L87 Difference]: Start difference. First operand 44472 states and 64083 transitions. Second operand has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 3 states have internal predecessors, (97), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-03 01:55:52,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:55:52,632 INFO L93 Difference]: Finished difference Result 78196 states and 112112 transitions. [2022-11-03 01:55:52,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 01:55:52,633 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 3 states have internal predecessors, (97), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 135 [2022-11-03 01:55:52,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:55:52,789 INFO L225 Difference]: With dead ends: 78196 [2022-11-03 01:55:52,789 INFO L226 Difference]: Without dead ends: 47906 [2022-11-03 01:55:52,855 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 01:55:52,857 INFO L413 NwaCegarLoop]: 161 mSDtfsCounter, 97 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:55:52,857 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [97 Valid, 202 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:55:52,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47906 states. [2022-11-03 01:55:55,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47906 to 47826. [2022-11-03 01:55:55,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47826 states, 41529 states have (on average 1.4384406077680656) internal successors, (59737), 41597 states have internal predecessors, (59737), 3573 states have call successors, (3573), 2768 states have call predecessors, (3573), 2723 states have return successors, (4205), 3461 states have call predecessors, (4205), 3571 states have call successors, (4205) [2022-11-03 01:55:55,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47826 states to 47826 states and 67515 transitions. [2022-11-03 01:55:55,735 INFO L78 Accepts]: Start accepts. Automaton has 47826 states and 67515 transitions. Word has length 135 [2022-11-03 01:55:55,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:55:55,735 INFO L495 AbstractCegarLoop]: Abstraction has 47826 states and 67515 transitions. [2022-11-03 01:55:55,735 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 3 states have internal predecessors, (97), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-03 01:55:55,736 INFO L276 IsEmpty]: Start isEmpty. Operand 47826 states and 67515 transitions. [2022-11-03 01:55:55,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-11-03 01:55:55,827 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:55:55,827 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:55:55,867 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-03 01:55:56,042 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-03 01:55:56,042 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:55:56,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:55:56,043 INFO L85 PathProgramCache]: Analyzing trace with hash 911611689, now seen corresponding path program 1 times [2022-11-03 01:55:56,043 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:55:56,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [767515802] [2022-11-03 01:55:56,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:56,043 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:55:56,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:56,310 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 13 proven. 37 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-03 01:55:56,310 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:55:56,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [767515802] [2022-11-03 01:55:56,311 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [767515802] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:55:56,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1448300743] [2022-11-03 01:55:56,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:56,311 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:55:56,312 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:55:56,313 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:55:56,334 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-03 01:55:56,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:56,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 708 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-03 01:55:56,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:55:56,519 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-11-03 01:55:56,520 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 01:55:56,520 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1448300743] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:55:56,520 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 01:55:56,520 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2022-11-03 01:55:56,521 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377035181] [2022-11-03 01:55:56,521 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:55:56,521 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 01:55:56,521 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:55:56,522 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 01:55:56,522 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 01:55:56,522 INFO L87 Difference]: Start difference. First operand 47826 states and 67515 transitions. Second operand has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-03 01:55:58,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:55:58,452 INFO L93 Difference]: Finished difference Result 64290 states and 91507 transitions. [2022-11-03 01:55:58,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 01:55:58,453 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 135 [2022-11-03 01:55:58,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:55:58,535 INFO L225 Difference]: With dead ends: 64290 [2022-11-03 01:55:58,535 INFO L226 Difference]: Without dead ends: 32170 [2022-11-03 01:55:58,591 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 01:55:58,591 INFO L413 NwaCegarLoop]: 246 mSDtfsCounter, 137 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 375 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:55:58,592 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [137 Valid, 375 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:55:58,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32170 states. [2022-11-03 01:56:00,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32170 to 31814. [2022-11-03 01:56:00,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31814 states, 27615 states have (on average 1.4275936990765887) internal successors, (39423), 27651 states have internal predecessors, (39423), 2397 states have call successors, (2397), 1848 states have call predecessors, (2397), 1801 states have return successors, (2523), 2315 states have call predecessors, (2523), 2395 states have call successors, (2523) [2022-11-03 01:56:00,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31814 states to 31814 states and 44343 transitions. [2022-11-03 01:56:00,471 INFO L78 Accepts]: Start accepts. Automaton has 31814 states and 44343 transitions. Word has length 135 [2022-11-03 01:56:00,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:56:00,472 INFO L495 AbstractCegarLoop]: Abstraction has 31814 states and 44343 transitions. [2022-11-03 01:56:00,472 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-03 01:56:00,473 INFO L276 IsEmpty]: Start isEmpty. Operand 31814 states and 44343 transitions. [2022-11-03 01:56:00,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2022-11-03 01:56:00,509 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:56:00,509 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:56:00,549 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-03 01:56:00,734 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-03 01:56:00,734 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:56:00,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:56:00,735 INFO L85 PathProgramCache]: Analyzing trace with hash 1319425537, now seen corresponding path program 1 times [2022-11-03 01:56:00,735 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:56:00,735 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2078176111] [2022-11-03 01:56:00,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:56:00,735 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:56:00,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:56:00,845 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 22 proven. 3 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2022-11-03 01:56:00,846 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:56:00,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2078176111] [2022-11-03 01:56:00,846 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2078176111] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:56:00,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [539246076] [2022-11-03 01:56:00,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:56:00,846 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:56:00,847 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:56:00,848 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:56:00,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-03 01:56:01,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:56:01,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 684 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 01:56:01,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:56:01,054 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 70 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-03 01:56:01,055 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 01:56:01,056 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [539246076] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:56:01,056 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 01:56:01,056 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2022-11-03 01:56:01,056 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852842940] [2022-11-03 01:56:01,056 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:56:01,057 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 01:56:01,057 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:56:01,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 01:56:01,058 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-03 01:56:01,058 INFO L87 Difference]: Start difference. First operand 31814 states and 44343 transitions. Second operand has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-11-03 01:56:03,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:56:03,156 INFO L93 Difference]: Finished difference Result 59778 states and 84103 transitions. [2022-11-03 01:56:03,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 01:56:03,157 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 131 [2022-11-03 01:56:03,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:56:03,237 INFO L225 Difference]: With dead ends: 59778 [2022-11-03 01:56:03,237 INFO L226 Difference]: Without dead ends: 43518 [2022-11-03 01:56:03,261 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-03 01:56:03,261 INFO L413 NwaCegarLoop]: 228 mSDtfsCounter, 90 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 371 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:56:03,262 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 371 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:56:03,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43518 states. [2022-11-03 01:56:05,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43518 to 39526. [2022-11-03 01:56:05,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39526 states, 34559 states have (on average 1.4481611157730259) internal successors, (50047), 34595 states have internal predecessors, (50047), 2781 states have call successors, (2781), 2232 states have call predecessors, (2781), 2185 states have return successors, (2907), 2699 states have call predecessors, (2907), 2779 states have call successors, (2907) [2022-11-03 01:56:05,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39526 states to 39526 states and 55735 transitions. [2022-11-03 01:56:05,437 INFO L78 Accepts]: Start accepts. Automaton has 39526 states and 55735 transitions. Word has length 131 [2022-11-03 01:56:05,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:56:05,438 INFO L495 AbstractCegarLoop]: Abstraction has 39526 states and 55735 transitions. [2022-11-03 01:56:05,438 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-11-03 01:56:05,438 INFO L276 IsEmpty]: Start isEmpty. Operand 39526 states and 55735 transitions. [2022-11-03 01:56:05,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2022-11-03 01:56:05,505 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:56:05,505 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2022-11-03 01:56:05,533 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-11-03 01:56:05,718 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-03 01:56:05,718 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:56:05,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:56:05,719 INFO L85 PathProgramCache]: Analyzing trace with hash 1628429854, now seen corresponding path program 1 times [2022-11-03 01:56:05,719 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:56:05,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1494110935] [2022-11-03 01:56:05,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:56:05,719 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:56:05,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:56:05,881 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 21 proven. 4 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2022-11-03 01:56:05,881 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:56:05,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1494110935] [2022-11-03 01:56:05,882 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1494110935] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:56:05,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [567375023] [2022-11-03 01:56:05,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:56:05,883 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:56:05,883 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:56:05,886 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:56:05,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8473dae3-bb7e-42d1-850b-bb7de4a1e9f7/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-03 01:56:06,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:56:06,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 681 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 01:56:06,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:56:06,119 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 72 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-03 01:56:06,119 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 01:56:06,119 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [567375023] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:56:06,120 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 01:56:06,120 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2022-11-03 01:56:06,120 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178470996] [2022-11-03 01:56:06,120 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:56:06,121 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 01:56:06,121 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:56:06,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 01:56:06,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-03 01:56:06,122 INFO L87 Difference]: Start difference. First operand 39526 states and 55735 transitions. Second operand has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11)