./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/rekh_aso.1.M1-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/rekh_aso.1.M1-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 0578c41b95f42d85ac77fb0006dcba936c74afd1d4a8fb3392e12544fff9b4d0 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:35:36,449 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:35:36,451 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:35:36,481 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:35:36,482 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:35:36,483 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:35:36,486 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:35:36,492 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:35:36,494 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:35:36,495 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:35:36,497 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:35:36,498 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:35:36,499 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:35:36,500 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:35:36,504 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:35:36,507 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:35:36,509 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:35:36,514 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:35:36,521 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:35:36,529 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:35:36,532 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:35:36,534 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:35:36,537 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:35:36,538 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:35:36,547 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:35:36,548 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:35:36,548 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:35:36,550 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:35:36,551 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:35:36,552 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:35:36,553 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:35:36,553 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:35:36,555 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:35:36,556 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:35:36,558 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:35:36,558 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:35:36,559 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:35:36,559 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:35:36,559 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:35:36,560 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:35:36,561 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:35:36,562 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:35:36,606 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:35:36,608 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:35:36,609 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:35:36,609 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:35:36,616 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:35:36,617 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:35:36,617 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:35:36,617 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:35:36,618 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:35:36,618 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:35:36,619 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:35:36,619 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:35:36,620 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:35:36,620 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:35:36,620 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:35:36,621 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:35:36,621 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:35:36,621 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:35:36,622 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:35:36,622 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:35:36,623 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:35:36,623 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:35:36,623 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:35:36,623 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:35:36,624 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:35:36,624 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:35:36,626 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:35:36,626 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:35:36,626 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:35:36,627 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:35:36,627 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:35:36,627 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:35:36,628 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:35:36,628 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:35:36,628 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:35:36,628 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:35:36,629 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:35:36,629 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:35:36,629 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:35:36,630 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:35:36,630 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:35:36,630 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0578c41b95f42d85ac77fb0006dcba936c74afd1d4a8fb3392e12544fff9b4d0 [2021-11-21 01:35:36,926 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:35:36,957 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:35:36,960 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:35:36,961 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:35:36,962 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:35:36,963 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/seq-mthreaded/rekh_aso.1.M1-2.c [2021-11-21 01:35:37,038 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/data/1da925395/dd27ab12023c4b9d9441f2b7619bcd77/FLAGa05336608 [2021-11-21 01:35:37,715 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:35:37,716 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/sv-benchmarks/c/seq-mthreaded/rekh_aso.1.M1-2.c [2021-11-21 01:35:37,734 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/data/1da925395/dd27ab12023c4b9d9441f2b7619bcd77/FLAGa05336608 [2021-11-21 01:35:37,887 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/data/1da925395/dd27ab12023c4b9d9441f2b7619bcd77 [2021-11-21 01:35:37,892 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:35:37,895 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:35:37,900 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:35:37,900 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:35:37,903 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:35:37,905 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:35:37" (1/1) ... [2021-11-21 01:35:37,907 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2e4e439 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:35:37, skipping insertion in model container [2021-11-21 01:35:37,907 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:35:37" (1/1) ... [2021-11-21 01:35:37,915 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:35:37,982 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:35:38,173 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_a3c59618-72ad-4da3-9c38-9f389884fbe1/sv-benchmarks/c/seq-mthreaded/rekh_aso.1.M1-2.c[1719,1732] [2021-11-21 01:35:38,577 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:35:38,588 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:35:38,602 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_a3c59618-72ad-4da3-9c38-9f389884fbe1/sv-benchmarks/c/seq-mthreaded/rekh_aso.1.M1-2.c[1719,1732] [2021-11-21 01:35:38,871 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:35:38,900 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:35:38,900 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:35:38 WrapperNode [2021-11-21 01:35:38,901 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:35:38,902 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:35:38,903 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:35:38,903 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:35:38,911 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:35:38" (1/1) ... [2021-11-21 01:35:39,050 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:35:38" (1/1) ... [2021-11-21 01:35:39,342 INFO L137 Inliner]: procedures = 58, calls = 3129, calls flagged for inlining = 19, calls inlined = 19, statements flattened = 5929 [2021-11-21 01:35:39,348 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:35:39,358 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:35:39,358 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:35:39,358 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:35:39,368 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:35:38" (1/1) ... [2021-11-21 01:35:39,369 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:35:38" (1/1) ... [2021-11-21 01:35:39,422 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:35:38" (1/1) ... [2021-11-21 01:35:39,423 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:35:38" (1/1) ... [2021-11-21 01:35:39,615 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:35:38" (1/1) ... [2021-11-21 01:35:39,721 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:35:38" (1/1) ... [2021-11-21 01:35:39,740 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:35:38" (1/1) ... [2021-11-21 01:35:39,773 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:35:39,774 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:35:39,775 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:35:39,775 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:35:39,777 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:35:38" (1/1) ... [2021-11-21 01:35:39,787 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:35:39,798 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:35:39,811 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:35:39,833 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:35:39,870 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:35:39,870 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_cmd_forward [2021-11-21 01:35:39,870 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_cmd_forward [2021-11-21 01:35:39,870 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_cs_t2 [2021-11-21 01:35:39,871 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_cs_t2 [2021-11-21 01:35:39,871 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_nxtway_gs_mode [2021-11-21 01:35:39,871 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_nxtway_gs_mode [2021-11-21 01:35:39,871 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 01:35:39,871 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_cs_t0 [2021-11-21 01:35:39,872 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_cs_t0 [2021-11-21 01:35:39,872 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_cs_t1 [2021-11-21 01:35:39,872 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_cs_t1 [2021-11-21 01:35:39,872 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_obstacle_flag [2021-11-21 01:35:39,872 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_obstacle_flag [2021-11-21 01:35:39,872 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 01:35:39,873 INFO L130 BoogieDeclarations]: Found specification of procedure nxt_motor_set_count [2021-11-21 01:35:39,873 INFO L138 BoogieDeclarations]: Found implementation of procedure nxt_motor_set_count [2021-11-21 01:35:39,873 INFO L130 BoogieDeclarations]: Found specification of procedure ecrobot_get_gyro_sensor [2021-11-21 01:35:39,873 INFO L138 BoogieDeclarations]: Found implementation of procedure ecrobot_get_gyro_sensor [2021-11-21 01:35:39,873 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_cmd_turn [2021-11-21 01:35:39,874 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_cmd_turn [2021-11-21 01:35:39,874 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_entry_pt_OSEK_Task_ts1 [2021-11-21 01:35:39,874 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_entry_pt_OSEK_Task_ts1 [2021-11-21 01:35:39,874 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_entry_pt_OSEK_Task_ts2 [2021-11-21 01:35:39,874 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_entry_pt_OSEK_Task_ts2 [2021-11-21 01:35:39,875 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_entry_pt_OSEK_Task_ts3 [2021-11-21 01:35:39,875 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_entry_pt_OSEK_Task_ts3 [2021-11-21 01:35:39,875 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 01:35:39,875 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 01:35:39,875 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2021-11-21 01:35:39,875 INFO L138 BoogieDeclarations]: Found implementation of procedure assert [2021-11-21 01:35:39,876 INFO L130 BoogieDeclarations]: Found specification of procedure nxt_motor_set_speed [2021-11-21 01:35:39,876 INFO L138 BoogieDeclarations]: Found implementation of procedure nxt_motor_set_speed [2021-11-21 01:35:39,876 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_cmd_forward [2021-11-21 01:35:39,876 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_cmd_forward [2021-11-21 01:35:39,876 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_obstacle_flag [2021-11-21 01:35:39,877 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_obstacle_flag [2021-11-21 01:35:39,877 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-21 01:35:39,877 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-21 01:35:39,877 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:35:39,877 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:35:39,877 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:35:39,878 INFO L130 BoogieDeclarations]: Found specification of procedure ecrobot_get_systick_ms [2021-11-21 01:35:39,878 INFO L138 BoogieDeclarations]: Found implementation of procedure ecrobot_get_systick_ms [2021-11-21 01:35:39,878 INFO L130 BoogieDeclarations]: Found specification of procedure nxt_motor_get_count [2021-11-21 01:35:39,878 INFO L138 BoogieDeclarations]: Found implementation of procedure nxt_motor_get_count [2021-11-21 01:35:39,878 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_nxtway_gs_mode [2021-11-21 01:35:39,879 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_nxtway_gs_mode [2021-11-21 01:35:39,879 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_cmd_turn [2021-11-21 01:35:39,879 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_cmd_turn [2021-11-21 01:35:40,525 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:35:40,527 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:35:51,965 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:35:52,495 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:35:52,495 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-21 01:35:52,502 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:35:52 BoogieIcfgContainer [2021-11-21 01:35:52,503 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:35:52,505 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:35:52,505 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:35:52,508 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:35:52,509 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:35:37" (1/3) ... [2021-11-21 01:35:52,509 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d336b47 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:35:52, skipping insertion in model container [2021-11-21 01:35:52,510 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:35:38" (2/3) ... [2021-11-21 01:35:52,511 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d336b47 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:35:52, skipping insertion in model container [2021-11-21 01:35:52,511 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:35:52" (3/3) ... [2021-11-21 01:35:52,515 INFO L111 eAbstractionObserver]: Analyzing ICFG rekh_aso.1.M1-2.c [2021-11-21 01:35:52,522 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:35:52,522 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:35:52,601 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:35:52,613 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 01:35:52,614 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:35:52,690 INFO L276 IsEmpty]: Start isEmpty. Operand has 2289 states, 1328 states have (on average 1.1995481927710843) internal successors, (1593), 1333 states have internal predecessors, (1593), 938 states have call successors, (938), 21 states have call predecessors, (938), 21 states have return successors, (938), 936 states have call predecessors, (938), 938 states have call successors, (938) [2021-11-21 01:35:52,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 911 [2021-11-21 01:35:52,770 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:35:52,772 INFO L514 BasicCegarLoop]: trace histogram [209, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:35:52,773 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:35:52,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:35:52,784 INFO L85 PathProgramCache]: Analyzing trace with hash -826604835, now seen corresponding path program 1 times [2021-11-21 01:35:52,793 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:35:52,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [37464541] [2021-11-21 01:35:52,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:35:52,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:35:53,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:35:54,786 INFO L134 CoverageAnalysis]: Checked inductivity of 43472 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43472 trivial. 0 not checked. [2021-11-21 01:35:54,802 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:35:54,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [37464541] [2021-11-21 01:35:54,803 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [37464541] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:35:54,803 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:35:54,804 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 01:35:54,805 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192576297] [2021-11-21 01:35:54,806 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:35:54,814 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:35:54,814 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:35:54,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:35:54,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:35:54,880 INFO L87 Difference]: Start difference. First operand has 2289 states, 1328 states have (on average 1.1995481927710843) internal successors, (1593), 1333 states have internal predecessors, (1593), 938 states have call successors, (938), 21 states have call predecessors, (938), 21 states have return successors, (938), 936 states have call predecessors, (938), 938 states have call successors, (938) Second operand has 3 states, 3 states have (on average 93.0) internal successors, (279), 3 states have internal predecessors, (279), 2 states have call successors, (212), 2 states have call predecessors, (212), 2 states have return successors, (211), 2 states have call predecessors, (211), 2 states have call successors, (211) [2021-11-21 01:35:56,937 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:35:59,090 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:35:59,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:35:59,509 INFO L93 Difference]: Finished difference Result 4010 states and 6128 transitions. [2021-11-21 01:35:59,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:35:59,512 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 93.0) internal successors, (279), 3 states have internal predecessors, (279), 2 states have call successors, (212), 2 states have call predecessors, (212), 2 states have return successors, (211), 2 states have call predecessors, (211), 2 states have call successors, (211) Word has length 910 [2021-11-21 01:35:59,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:35:59,552 INFO L225 Difference]: With dead ends: 4010 [2021-11-21 01:35:59,552 INFO L226 Difference]: Without dead ends: 2287 [2021-11-21 01:35:59,567 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:35:59,571 INFO L933 BasicCegarLoop]: 3434 mSDtfsCounter, 24 mSDsluCounter, 3411 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 3 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 6822 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:35:59,572 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 6822 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 59 Invalid, 2 Unknown, 0 Unchecked, 4.3s Time] [2021-11-21 01:35:59,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2287 states. [2021-11-21 01:36:00,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2287 to 2287. [2021-11-21 01:36:00,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2287 states, 1327 states have (on average 1.1981914091936698) internal successors, (1590), 1332 states have internal predecessors, (1590), 938 states have call successors, (938), 21 states have call predecessors, (938), 21 states have return successors, (937), 935 states have call predecessors, (937), 937 states have call successors, (937) [2021-11-21 01:36:00,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2287 states to 2287 states and 3465 transitions. [2021-11-21 01:36:00,326 INFO L78 Accepts]: Start accepts. Automaton has 2287 states and 3465 transitions. Word has length 910 [2021-11-21 01:36:00,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:36:00,331 INFO L470 AbstractCegarLoop]: Abstraction has 2287 states and 3465 transitions. [2021-11-21 01:36:00,332 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 93.0) internal successors, (279), 3 states have internal predecessors, (279), 2 states have call successors, (212), 2 states have call predecessors, (212), 2 states have return successors, (211), 2 states have call predecessors, (211), 2 states have call successors, (211) [2021-11-21 01:36:00,332 INFO L276 IsEmpty]: Start isEmpty. Operand 2287 states and 3465 transitions. [2021-11-21 01:36:00,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 917 [2021-11-21 01:36:00,393 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:36:00,394 INFO L514 BasicCegarLoop]: trace histogram [209, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:36:00,394 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:36:00,395 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:36:00,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:36:00,398 INFO L85 PathProgramCache]: Analyzing trace with hash 1294729949, now seen corresponding path program 1 times [2021-11-21 01:36:00,398 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:36:00,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1685553592] [2021-11-21 01:36:00,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:36:00,403 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:36:00,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:36:01,826 INFO L134 CoverageAnalysis]: Checked inductivity of 43474 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43474 trivial. 0 not checked. [2021-11-21 01:36:01,826 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:36:01,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1685553592] [2021-11-21 01:36:01,827 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1685553592] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:36:01,827 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:36:01,828 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:36:01,829 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [716729081] [2021-11-21 01:36:01,829 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:36:01,834 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:36:01,835 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:36:01,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:36:01,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:36:01,837 INFO L87 Difference]: Start difference. First operand 2287 states and 3465 transitions. Second operand has 5 states, 4 states have (on average 70.0) internal successors, (280), 5 states have internal predecessors, (280), 4 states have call successors, (214), 2 states have call predecessors, (214), 2 states have return successors, (213), 3 states have call predecessors, (213), 4 states have call successors, (213) [2021-11-21 01:36:03,922 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.08s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:36:06,023 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:36:12,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:36:12,521 INFO L93 Difference]: Finished difference Result 4286 states and 6501 transitions. [2021-11-21 01:36:12,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:36:12,523 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 70.0) internal successors, (280), 5 states have internal predecessors, (280), 4 states have call successors, (214), 2 states have call predecessors, (214), 2 states have return successors, (213), 3 states have call predecessors, (213), 4 states have call successors, (213) Word has length 916 [2021-11-21 01:36:12,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:36:12,548 INFO L225 Difference]: With dead ends: 4286 [2021-11-21 01:36:12,549 INFO L226 Difference]: Without dead ends: 2567 [2021-11-21 01:36:12,561 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:36:12,562 INFO L933 BasicCegarLoop]: 3793 mSDtfsCounter, 3641 mSDsluCounter, 3155 mSDsCounter, 0 mSdLazyCounter, 1683 mSolverCounterSat, 650 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3641 SdHoareTripleChecker+Valid, 6913 SdHoareTripleChecker+Invalid, 2335 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 650 IncrementalHoareTripleChecker+Valid, 1683 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:36:12,563 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3641 Valid, 6913 Invalid, 2335 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [650 Valid, 1683 Invalid, 2 Unknown, 0 Unchecked, 10.2s Time] [2021-11-21 01:36:12,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2567 states. [2021-11-21 01:36:12,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2567 to 2565. [2021-11-21 01:36:12,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2565 states, 1529 states have (on average 1.2184434270765205) internal successors, (1863), 1534 states have internal predecessors, (1863), 1004 states have call successors, (1004), 31 states have call predecessors, (1004), 31 states have return successors, (1003), 1001 states have call predecessors, (1003), 1003 states have call successors, (1003) [2021-11-21 01:36:13,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2565 states to 2565 states and 3870 transitions. [2021-11-21 01:36:13,016 INFO L78 Accepts]: Start accepts. Automaton has 2565 states and 3870 transitions. Word has length 916 [2021-11-21 01:36:13,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:36:13,018 INFO L470 AbstractCegarLoop]: Abstraction has 2565 states and 3870 transitions. [2021-11-21 01:36:13,019 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 70.0) internal successors, (280), 5 states have internal predecessors, (280), 4 states have call successors, (214), 2 states have call predecessors, (214), 2 states have return successors, (213), 3 states have call predecessors, (213), 4 states have call successors, (213) [2021-11-21 01:36:13,020 INFO L276 IsEmpty]: Start isEmpty. Operand 2565 states and 3870 transitions. [2021-11-21 01:36:13,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 921 [2021-11-21 01:36:13,032 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:36:13,033 INFO L514 BasicCegarLoop]: trace histogram [209, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:36:13,033 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 01:36:13,033 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:36:13,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:36:13,034 INFO L85 PathProgramCache]: Analyzing trace with hash 1938628957, now seen corresponding path program 1 times [2021-11-21 01:36:13,034 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:36:13,035 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1846729406] [2021-11-21 01:36:13,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:36:13,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:36:13,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:36:13,834 INFO L134 CoverageAnalysis]: Checked inductivity of 43474 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43474 trivial. 0 not checked. [2021-11-21 01:36:13,834 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:36:13,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1846729406] [2021-11-21 01:36:13,835 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1846729406] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:36:13,835 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:36:13,835 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:36:13,836 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537259394] [2021-11-21 01:36:13,836 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:36:13,838 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:36:13,839 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:36:13,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:36:13,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:36:13,842 INFO L87 Difference]: Start difference. First operand 2565 states and 3870 transitions. Second operand has 5 states, 4 states have (on average 70.5) internal successors, (282), 5 states have internal predecessors, (282), 4 states have call successors, (215), 2 states have call predecessors, (215), 2 states have return successors, (214), 3 states have call predecessors, (214), 4 states have call successors, (214) [2021-11-21 01:36:15,857 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:36:17,969 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:36:25,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:36:25,542 INFO L93 Difference]: Finished difference Result 4558 states and 6898 transitions. [2021-11-21 01:36:25,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:36:25,544 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 70.5) internal successors, (282), 5 states have internal predecessors, (282), 4 states have call successors, (215), 2 states have call predecessors, (215), 2 states have return successors, (214), 3 states have call predecessors, (214), 4 states have call successors, (214) Word has length 920 [2021-11-21 01:36:25,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:36:25,574 INFO L225 Difference]: With dead ends: 4558 [2021-11-21 01:36:25,574 INFO L226 Difference]: Without dead ends: 2563 [2021-11-21 01:36:25,590 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:36:25,591 INFO L933 BasicCegarLoop]: 3789 mSDtfsCounter, 3628 mSDsluCounter, 3151 mSDsCounter, 0 mSdLazyCounter, 1675 mSolverCounterSat, 646 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3628 SdHoareTripleChecker+Valid, 6905 SdHoareTripleChecker+Invalid, 2323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 646 IncrementalHoareTripleChecker+Valid, 1675 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:36:25,592 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3628 Valid, 6905 Invalid, 2323 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [646 Valid, 1675 Invalid, 2 Unknown, 0 Unchecked, 11.3s Time] [2021-11-21 01:36:25,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2563 states. [2021-11-21 01:36:25,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2563 to 2561. [2021-11-21 01:36:25,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2561 states, 1527 states have (on average 1.2174197773411919) internal successors, (1859), 1532 states have internal predecessors, (1859), 1002 states have call successors, (1002), 31 states have call predecessors, (1002), 31 states have return successors, (1001), 999 states have call predecessors, (1001), 1001 states have call successors, (1001) [2021-11-21 01:36:25,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2561 states to 2561 states and 3862 transitions. [2021-11-21 01:36:25,934 INFO L78 Accepts]: Start accepts. Automaton has 2561 states and 3862 transitions. Word has length 920 [2021-11-21 01:36:25,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:36:25,936 INFO L470 AbstractCegarLoop]: Abstraction has 2561 states and 3862 transitions. [2021-11-21 01:36:25,937 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 70.5) internal successors, (282), 5 states have internal predecessors, (282), 4 states have call successors, (215), 2 states have call predecessors, (215), 2 states have return successors, (214), 3 states have call predecessors, (214), 4 states have call successors, (214) [2021-11-21 01:36:25,937 INFO L276 IsEmpty]: Start isEmpty. Operand 2561 states and 3862 transitions. [2021-11-21 01:36:25,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 921 [2021-11-21 01:36:25,980 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:36:25,981 INFO L514 BasicCegarLoop]: trace histogram [209, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:36:25,981 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-21 01:36:25,982 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:36:25,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:36:25,982 INFO L85 PathProgramCache]: Analyzing trace with hash -630521878, now seen corresponding path program 1 times [2021-11-21 01:36:25,983 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:36:25,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1721586636] [2021-11-21 01:36:25,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:36:25,986 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:36:26,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:36:26,749 INFO L134 CoverageAnalysis]: Checked inductivity of 43474 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43474 trivial. 0 not checked. [2021-11-21 01:36:26,750 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:36:26,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1721586636] [2021-11-21 01:36:26,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1721586636] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:36:26,750 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:36:26,751 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 01:36:26,751 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524683595] [2021-11-21 01:36:26,751 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:36:26,753 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 01:36:26,753 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:36:26,753 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 01:36:26,754 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:36:26,755 INFO L87 Difference]: Start difference. First operand 2561 states and 3862 transitions. Second operand has 6 states, 6 states have (on average 47.0) internal successors, (282), 5 states have internal predecessors, (282), 3 states have call successors, (215), 3 states have call predecessors, (215), 2 states have return successors, (214), 3 states have call predecessors, (214), 3 states have call successors, (214) [2021-11-21 01:36:28,771 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:36:33,177 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:36:52,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:36:52,163 INFO L93 Difference]: Finished difference Result 4468 states and 6750 transitions. [2021-11-21 01:36:52,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 01:36:52,167 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 47.0) internal successors, (282), 5 states have internal predecessors, (282), 3 states have call successors, (215), 3 states have call predecessors, (215), 2 states have return successors, (214), 3 states have call predecessors, (214), 3 states have call successors, (214) Word has length 920 [2021-11-21 01:36:52,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:36:52,213 INFO L225 Difference]: With dead ends: 4468 [2021-11-21 01:36:52,213 INFO L226 Difference]: Without dead ends: 4443 [2021-11-21 01:36:52,218 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:36:52,219 INFO L933 BasicCegarLoop]: 3317 mSDtfsCounter, 2494 mSDsluCounter, 9192 mSDsCounter, 0 mSdLazyCounter, 5831 mSolverCounterSat, 2001 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3131 SdHoareTripleChecker+Valid, 12489 SdHoareTripleChecker+Invalid, 7834 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.2s SdHoareTripleChecker+Time, 2001 IncrementalHoareTripleChecker+Valid, 5831 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 24.8s IncrementalHoareTripleChecker+Time [2021-11-21 01:36:52,220 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3131 Valid, 12489 Invalid, 7834 Unknown, 0 Unchecked, 0.2s Time], IncrementalHoareTripleChecker [2001 Valid, 5831 Invalid, 2 Unknown, 0 Unchecked, 24.8s Time] [2021-11-21 01:36:52,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4443 states. [2021-11-21 01:36:52,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4443 to 3579. [2021-11-21 01:36:52,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3579 states, 2142 states have (on average 1.2180205415499532) internal successors, (2609), 2148 states have internal predecessors, (2609), 1393 states have call successors, (1393), 42 states have call predecessors, (1393), 43 states have return successors, (1415), 1390 states have call predecessors, (1415), 1392 states have call successors, (1415) [2021-11-21 01:36:52,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3579 states to 3579 states and 5417 transitions. [2021-11-21 01:36:52,968 INFO L78 Accepts]: Start accepts. Automaton has 3579 states and 5417 transitions. Word has length 920 [2021-11-21 01:36:52,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:36:52,970 INFO L470 AbstractCegarLoop]: Abstraction has 3579 states and 5417 transitions. [2021-11-21 01:36:52,970 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 47.0) internal successors, (282), 5 states have internal predecessors, (282), 3 states have call successors, (215), 3 states have call predecessors, (215), 2 states have return successors, (214), 3 states have call predecessors, (214), 3 states have call successors, (214) [2021-11-21 01:36:52,971 INFO L276 IsEmpty]: Start isEmpty. Operand 3579 states and 5417 transitions. [2021-11-21 01:36:52,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 970 [2021-11-21 01:36:52,989 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:36:52,990 INFO L514 BasicCegarLoop]: trace histogram [214, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:36:52,990 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-21 01:36:52,990 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:36:52,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:36:52,991 INFO L85 PathProgramCache]: Analyzing trace with hash -780182833, now seen corresponding path program 1 times [2021-11-21 01:36:52,991 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:36:52,992 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [315063026] [2021-11-21 01:36:52,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:36:52,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:36:53,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:36:53,857 INFO L134 CoverageAnalysis]: Checked inductivity of 45592 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 45590 trivial. 0 not checked. [2021-11-21 01:36:53,858 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:36:53,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [315063026] [2021-11-21 01:36:53,858 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [315063026] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:36:53,858 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:36:53,859 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:36:53,859 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223250467] [2021-11-21 01:36:53,859 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:36:53,861 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:36:53,862 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:36:53,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:36:53,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:36:53,863 INFO L87 Difference]: Start difference. First operand 3579 states and 5417 transitions. Second operand has 5 states, 4 states have (on average 76.0) internal successors, (304), 5 states have internal predecessors, (304), 4 states have call successors, (224), 2 states have call predecessors, (224), 2 states have return successors, (223), 3 states have call predecessors, (223), 4 states have call successors, (223) [2021-11-21 01:36:55,879 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:36:57,999 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:37:06,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:37:06,590 INFO L93 Difference]: Finished difference Result 7404 states and 11149 transitions. [2021-11-21 01:37:06,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:37:06,593 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 76.0) internal successors, (304), 5 states have internal predecessors, (304), 4 states have call successors, (224), 2 states have call predecessors, (224), 2 states have return successors, (223), 3 states have call predecessors, (223), 4 states have call successors, (223) Word has length 969 [2021-11-21 01:37:06,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:37:06,638 INFO L225 Difference]: With dead ends: 7404 [2021-11-21 01:37:06,639 INFO L226 Difference]: Without dead ends: 4461 [2021-11-21 01:37:06,655 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:37:06,656 INFO L933 BasicCegarLoop]: 4252 mSDtfsCounter, 3911 mSDsluCounter, 4182 mSDsCounter, 0 mSdLazyCounter, 1718 mSolverCounterSat, 1156 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3911 SdHoareTripleChecker+Valid, 8366 SdHoareTripleChecker+Invalid, 2876 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1156 IncrementalHoareTripleChecker+Valid, 1718 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:37:06,657 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3911 Valid, 8366 Invalid, 2876 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1156 Valid, 1718 Invalid, 2 Unknown, 0 Unchecked, 12.3s Time] [2021-11-21 01:37:06,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4461 states. [2021-11-21 01:37:07,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4461 to 4457. [2021-11-21 01:37:07,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4457 states, 2767 states have (on average 1.2443079147090712) internal successors, (3443), 2777 states have internal predecessors, (3443), 1612 states have call successors, (1612), 75 states have call predecessors, (1612), 77 states have return successors, (1634), 1607 states have call predecessors, (1634), 1611 states have call successors, (1634) [2021-11-21 01:37:07,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4457 states to 4457 states and 6689 transitions. [2021-11-21 01:37:07,370 INFO L78 Accepts]: Start accepts. Automaton has 4457 states and 6689 transitions. Word has length 969 [2021-11-21 01:37:07,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:37:07,371 INFO L470 AbstractCegarLoop]: Abstraction has 4457 states and 6689 transitions. [2021-11-21 01:37:07,372 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 76.0) internal successors, (304), 5 states have internal predecessors, (304), 4 states have call successors, (224), 2 states have call predecessors, (224), 2 states have return successors, (223), 3 states have call predecessors, (223), 4 states have call successors, (223) [2021-11-21 01:37:07,372 INFO L276 IsEmpty]: Start isEmpty. Operand 4457 states and 6689 transitions. [2021-11-21 01:37:07,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 974 [2021-11-21 01:37:07,389 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:37:07,390 INFO L514 BasicCegarLoop]: trace histogram [214, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:37:07,390 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-21 01:37:07,391 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:37:07,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:37:07,392 INFO L85 PathProgramCache]: Analyzing trace with hash -1191849904, now seen corresponding path program 1 times [2021-11-21 01:37:07,392 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:37:07,393 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [851019626] [2021-11-21 01:37:07,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:37:07,393 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:37:07,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:37:08,111 INFO L134 CoverageAnalysis]: Checked inductivity of 45592 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 45585 trivial. 0 not checked. [2021-11-21 01:37:08,111 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:37:08,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [851019626] [2021-11-21 01:37:08,112 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [851019626] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:37:08,112 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:37:08,112 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 01:37:08,112 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566260066] [2021-11-21 01:37:08,112 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:37:08,114 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 01:37:08,114 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:37:08,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 01:37:08,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:37:08,116 INFO L87 Difference]: Start difference. First operand 4457 states and 6689 transitions. Second operand has 6 states, 6 states have (on average 51.666666666666664) internal successors, (310), 6 states have internal predecessors, (310), 3 states have call successors, (225), 2 states have call predecessors, (225), 4 states have return successors, (224), 3 states have call predecessors, (224), 3 states have call successors, (224) [2021-11-21 01:37:10,142 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:37:12,189 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:37:21,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:37:21,065 INFO L93 Difference]: Finished difference Result 7649 states and 11513 transitions. [2021-11-21 01:37:21,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 01:37:21,068 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 51.666666666666664) internal successors, (310), 6 states have internal predecessors, (310), 3 states have call successors, (225), 2 states have call predecessors, (225), 4 states have return successors, (224), 3 states have call predecessors, (224), 3 states have call successors, (224) Word has length 973 [2021-11-21 01:37:21,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:37:21,113 INFO L225 Difference]: With dead ends: 7649 [2021-11-21 01:37:21,113 INFO L226 Difference]: Without dead ends: 4449 [2021-11-21 01:37:21,129 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-21 01:37:21,130 INFO L933 BasicCegarLoop]: 3803 mSDtfsCounter, 3453 mSDsluCounter, 4464 mSDsCounter, 0 mSdLazyCounter, 2093 mSolverCounterSat, 397 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3453 SdHoareTripleChecker+Valid, 8217 SdHoareTripleChecker+Invalid, 2492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 397 IncrementalHoareTripleChecker+Valid, 2093 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:37:21,131 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3453 Valid, 8217 Invalid, 2492 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [397 Valid, 2093 Invalid, 2 Unknown, 0 Unchecked, 12.6s Time] [2021-11-21 01:37:21,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4449 states. [2021-11-21 01:37:21,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4449 to 4449. [2021-11-21 01:37:21,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4449 states, 2762 states have (on average 1.2433019551049964) internal successors, (3434), 2772 states have internal predecessors, (3434), 1609 states have call successors, (1609), 75 states have call predecessors, (1609), 77 states have return successors, (1631), 1604 states have call predecessors, (1631), 1608 states have call successors, (1631) [2021-11-21 01:37:21,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4449 states to 4449 states and 6674 transitions. [2021-11-21 01:37:21,750 INFO L78 Accepts]: Start accepts. Automaton has 4449 states and 6674 transitions. Word has length 973 [2021-11-21 01:37:21,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:37:21,752 INFO L470 AbstractCegarLoop]: Abstraction has 4449 states and 6674 transitions. [2021-11-21 01:37:21,752 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 51.666666666666664) internal successors, (310), 6 states have internal predecessors, (310), 3 states have call successors, (225), 2 states have call predecessors, (225), 4 states have return successors, (224), 3 states have call predecessors, (224), 3 states have call successors, (224) [2021-11-21 01:37:21,753 INFO L276 IsEmpty]: Start isEmpty. Operand 4449 states and 6674 transitions. [2021-11-21 01:37:21,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 975 [2021-11-21 01:37:21,770 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:37:21,771 INFO L514 BasicCegarLoop]: trace histogram [214, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:37:21,772 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-21 01:37:21,772 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:37:21,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:37:21,773 INFO L85 PathProgramCache]: Analyzing trace with hash -743904789, now seen corresponding path program 1 times [2021-11-21 01:37:21,773 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:37:21,773 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1827872584] [2021-11-21 01:37:21,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:37:21,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:37:22,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:37:22,532 INFO L134 CoverageAnalysis]: Checked inductivity of 45592 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 45586 trivial. 0 not checked. [2021-11-21 01:37:22,533 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:37:22,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1827872584] [2021-11-21 01:37:22,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1827872584] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:37:22,533 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:37:22,534 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 01:37:22,541 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514012718] [2021-11-21 01:37:22,542 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:37:22,543 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 01:37:22,544 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:37:22,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 01:37:22,544 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:37:22,545 INFO L87 Difference]: Start difference. First operand 4449 states and 6674 transitions. Second operand has 6 states, 6 states have (on average 51.666666666666664) internal successors, (310), 6 states have internal predecessors, (310), 3 states have call successors, (225), 2 states have call predecessors, (225), 4 states have return successors, (224), 3 states have call predecessors, (224), 3 states have call successors, (224) [2021-11-21 01:37:24,562 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:37:26,670 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:37:39,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:37:39,042 INFO L93 Difference]: Finished difference Result 7640 states and 11489 transitions. [2021-11-21 01:37:39,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:37:39,045 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 51.666666666666664) internal successors, (310), 6 states have internal predecessors, (310), 3 states have call successors, (225), 2 states have call predecessors, (225), 4 states have return successors, (224), 3 states have call predecessors, (224), 3 states have call successors, (224) Word has length 974 [2021-11-21 01:37:39,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:37:39,087 INFO L225 Difference]: With dead ends: 7640 [2021-11-21 01:37:39,087 INFO L226 Difference]: Without dead ends: 4448 [2021-11-21 01:37:39,101 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:37:39,102 INFO L933 BasicCegarLoop]: 3768 mSDtfsCounter, 3959 mSDsluCounter, 4998 mSDsCounter, 0 mSdLazyCounter, 2866 mSolverCounterSat, 1188 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3959 SdHoareTripleChecker+Valid, 8706 SdHoareTripleChecker+Invalid, 4056 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1188 IncrementalHoareTripleChecker+Valid, 2866 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 16.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:37:39,103 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3959 Valid, 8706 Invalid, 4056 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1188 Valid, 2866 Invalid, 2 Unknown, 0 Unchecked, 16.1s Time] [2021-11-21 01:37:39,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4448 states. [2021-11-21 01:37:39,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4448 to 4446. [2021-11-21 01:37:39,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4446 states, 2760 states have (on average 1.2427536231884058) internal successors, (3430), 2770 states have internal predecessors, (3430), 1608 states have call successors, (1608), 75 states have call predecessors, (1608), 77 states have return successors, (1630), 1603 states have call predecessors, (1630), 1607 states have call successors, (1630) [2021-11-21 01:37:39,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4446 states to 4446 states and 6668 transitions. [2021-11-21 01:37:39,766 INFO L78 Accepts]: Start accepts. Automaton has 4446 states and 6668 transitions. Word has length 974 [2021-11-21 01:37:39,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:37:39,768 INFO L470 AbstractCegarLoop]: Abstraction has 4446 states and 6668 transitions. [2021-11-21 01:37:39,768 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 51.666666666666664) internal successors, (310), 6 states have internal predecessors, (310), 3 states have call successors, (225), 2 states have call predecessors, (225), 4 states have return successors, (224), 3 states have call predecessors, (224), 3 states have call successors, (224) [2021-11-21 01:37:39,768 INFO L276 IsEmpty]: Start isEmpty. Operand 4446 states and 6668 transitions. [2021-11-21 01:37:39,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 974 [2021-11-21 01:37:39,786 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:37:39,787 INFO L514 BasicCegarLoop]: trace histogram [210, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:37:39,787 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-21 01:37:39,787 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:37:39,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:37:39,789 INFO L85 PathProgramCache]: Analyzing trace with hash -598577425, now seen corresponding path program 1 times [2021-11-21 01:37:39,789 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:37:39,789 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1926027933] [2021-11-21 01:37:39,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:37:39,790 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:37:40,047 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:37:40,056 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1018851764] [2021-11-21 01:37:40,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:37:40,057 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:37:40,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:37:40,062 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:37:40,070 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:37:41,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:37:41,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 3247 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 01:37:41,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:37:43,218 INFO L134 CoverageAnalysis]: Checked inductivity of 43900 backedges. 832 proven. 0 refuted. 0 times theorem prover too weak. 43068 trivial. 0 not checked. [2021-11-21 01:37:43,219 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:37:43,219 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:37:43,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1926027933] [2021-11-21 01:37:43,220 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:37:43,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1018851764] [2021-11-21 01:37:43,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1018851764] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:37:43,220 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:37:43,221 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:37:43,221 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029725824] [2021-11-21 01:37:43,221 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:37:43,224 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:37:43,224 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:37:43,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:37:43,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:37:43,225 INFO L87 Difference]: Start difference. First operand 4446 states and 6668 transitions. Second operand has 5 states, 5 states have (on average 62.6) internal successors, (313), 5 states have internal predecessors, (313), 3 states have call successors, (223), 3 states have call predecessors, (223), 3 states have return successors, (222), 3 states have call predecessors, (222), 3 states have call successors, (222) [2021-11-21 01:37:45,239 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:37:47,306 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:37:55,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:37:55,235 INFO L93 Difference]: Finished difference Result 8267 states and 12441 transitions. [2021-11-21 01:37:55,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:37:55,252 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 62.6) internal successors, (313), 5 states have internal predecessors, (313), 3 states have call successors, (223), 3 states have call predecessors, (223), 3 states have return successors, (222), 3 states have call predecessors, (222), 3 states have call successors, (222) Word has length 973 [2021-11-21 01:37:55,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:37:55,283 INFO L225 Difference]: With dead ends: 8267 [2021-11-21 01:37:55,283 INFO L226 Difference]: Without dead ends: 4448 [2021-11-21 01:37:55,300 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 973 GetRequests, 969 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:37:55,301 INFO L933 BasicCegarLoop]: 3473 mSDtfsCounter, 1694 mSDsluCounter, 5460 mSDsCounter, 0 mSdLazyCounter, 2010 mSolverCounterSat, 29 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1697 SdHoareTripleChecker+Valid, 8872 SdHoareTripleChecker+Invalid, 2041 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 2010 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:37:55,302 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1697 Valid, 8872 Invalid, 2041 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 2010 Invalid, 2 Unknown, 0 Unchecked, 11.6s Time] [2021-11-21 01:37:55,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4448 states. [2021-11-21 01:37:55,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4448 to 4446. [2021-11-21 01:37:55,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4446 states, 2760 states have (on average 1.2420289855072464) internal successors, (3428), 2770 states have internal predecessors, (3428), 1608 states have call successors, (1608), 75 states have call predecessors, (1608), 77 states have return successors, (1630), 1603 states have call predecessors, (1630), 1607 states have call successors, (1630) [2021-11-21 01:37:56,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4446 states to 4446 states and 6666 transitions. [2021-11-21 01:37:56,014 INFO L78 Accepts]: Start accepts. Automaton has 4446 states and 6666 transitions. Word has length 973 [2021-11-21 01:37:56,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:37:56,016 INFO L470 AbstractCegarLoop]: Abstraction has 4446 states and 6666 transitions. [2021-11-21 01:37:56,016 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 62.6) internal successors, (313), 5 states have internal predecessors, (313), 3 states have call successors, (223), 3 states have call predecessors, (223), 3 states have return successors, (222), 3 states have call predecessors, (222), 3 states have call successors, (222) [2021-11-21 01:37:56,017 INFO L276 IsEmpty]: Start isEmpty. Operand 4446 states and 6666 transitions. [2021-11-21 01:37:56,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 979 [2021-11-21 01:37:56,037 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:37:56,038 INFO L514 BasicCegarLoop]: trace histogram [214, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:37:56,079 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:37:56,265 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-21 01:37:56,266 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:37:56,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:37:56,267 INFO L85 PathProgramCache]: Analyzing trace with hash -1576278933, now seen corresponding path program 1 times [2021-11-21 01:37:56,267 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:37:56,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1244263463] [2021-11-21 01:37:56,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:37:56,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:37:56,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:37:57,068 INFO L134 CoverageAnalysis]: Checked inductivity of 45590 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 45585 trivial. 0 not checked. [2021-11-21 01:37:57,068 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:37:57,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1244263463] [2021-11-21 01:37:57,069 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1244263463] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:37:57,069 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:37:57,069 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 01:37:57,070 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090670843] [2021-11-21 01:37:57,070 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:37:57,072 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 01:37:57,072 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:37:57,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 01:37:57,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:37:57,073 INFO L87 Difference]: Start difference. First operand 4446 states and 6666 transitions. Second operand has 6 states, 6 states have (on average 52.166666666666664) internal successors, (313), 6 states have internal predecessors, (313), 4 states have call successors, (226), 2 states have call predecessors, (226), 4 states have return successors, (225), 4 states have call predecessors, (225), 4 states have call successors, (225) [2021-11-21 01:37:59,091 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:38:01,178 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:38:17,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:38:17,257 INFO L93 Difference]: Finished difference Result 7635 states and 11476 transitions. [2021-11-21 01:38:17,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:38:17,261 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 52.166666666666664) internal successors, (313), 6 states have internal predecessors, (313), 4 states have call successors, (226), 2 states have call predecessors, (226), 4 states have return successors, (225), 4 states have call predecessors, (225), 4 states have call successors, (225) Word has length 978 [2021-11-21 01:38:17,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:38:17,288 INFO L225 Difference]: With dead ends: 7635 [2021-11-21 01:38:17,288 INFO L226 Difference]: Without dead ends: 4446 [2021-11-21 01:38:17,300 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:38:17,301 INFO L933 BasicCegarLoop]: 4268 mSDtfsCounter, 3925 mSDsluCounter, 6544 mSDsCounter, 0 mSdLazyCounter, 2967 mSolverCounterSat, 1170 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3925 SdHoareTripleChecker+Valid, 10701 SdHoareTripleChecker+Invalid, 4139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1170 IncrementalHoareTripleChecker+Valid, 2967 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.8s IncrementalHoareTripleChecker+Time [2021-11-21 01:38:17,301 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3925 Valid, 10701 Invalid, 4139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1170 Valid, 2967 Invalid, 2 Unknown, 0 Unchecked, 19.8s Time] [2021-11-21 01:38:17,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4446 states. [2021-11-21 01:38:17,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4446 to 4444. [2021-11-21 01:38:17,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4444 states, 2759 states have (on average 1.2417542587894164) internal successors, (3426), 2769 states have internal predecessors, (3426), 1607 states have call successors, (1607), 75 states have call predecessors, (1607), 77 states have return successors, (1629), 1602 states have call predecessors, (1629), 1606 states have call successors, (1629) [2021-11-21 01:38:17,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4444 states to 4444 states and 6662 transitions. [2021-11-21 01:38:17,970 INFO L78 Accepts]: Start accepts. Automaton has 4444 states and 6662 transitions. Word has length 978 [2021-11-21 01:38:17,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:38:17,971 INFO L470 AbstractCegarLoop]: Abstraction has 4444 states and 6662 transitions. [2021-11-21 01:38:17,972 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 52.166666666666664) internal successors, (313), 6 states have internal predecessors, (313), 4 states have call successors, (226), 2 states have call predecessors, (226), 4 states have return successors, (225), 4 states have call predecessors, (225), 4 states have call successors, (225) [2021-11-21 01:38:17,972 INFO L276 IsEmpty]: Start isEmpty. Operand 4444 states and 6662 transitions. [2021-11-21 01:38:17,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 980 [2021-11-21 01:38:17,990 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:38:17,991 INFO L514 BasicCegarLoop]: trace histogram [214, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:38:17,991 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-21 01:38:17,991 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:38:17,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:38:17,992 INFO L85 PathProgramCache]: Analyzing trace with hash -1699343923, now seen corresponding path program 1 times [2021-11-21 01:38:17,992 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:38:17,993 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411090837] [2021-11-21 01:38:17,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:38:17,993 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:38:18,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:38:18,773 INFO L134 CoverageAnalysis]: Checked inductivity of 45595 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 45591 trivial. 0 not checked. [2021-11-21 01:38:18,773 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:38:18,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [411090837] [2021-11-21 01:38:18,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [411090837] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:38:18,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [701660041] [2021-11-21 01:38:18,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:38:18,775 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:38:18,775 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:38:18,778 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:38:18,803 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:38:19,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:38:19,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 3168 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 01:38:19,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:38:22,161 INFO L134 CoverageAnalysis]: Checked inductivity of 45595 backedges. 2097 proven. 0 refuted. 0 times theorem prover too weak. 43498 trivial. 0 not checked. [2021-11-21 01:38:22,161 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:38:22,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [701660041] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:38:22,161 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:38:22,162 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [4] total 9 [2021-11-21 01:38:22,162 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892848280] [2021-11-21 01:38:22,162 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:38:22,164 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 01:38:22,164 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:38:22,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 01:38:22,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:38:22,165 INFO L87 Difference]: Start difference. First operand 4444 states and 6662 transitions. Second operand has 7 states, 7 states have (on average 44.57142857142857) internal successors, (312), 6 states have internal predecessors, (312), 3 states have call successors, (226), 4 states have call predecessors, (226), 3 states have return successors, (225), 3 states have call predecessors, (225), 3 states have call successors, (225) [2021-11-21 01:38:24,182 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:38:26,234 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:38:37,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:38:37,799 INFO L93 Difference]: Finished difference Result 5480 states and 8227 transitions. [2021-11-21 01:38:37,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 01:38:37,800 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 44.57142857142857) internal successors, (312), 6 states have internal predecessors, (312), 3 states have call successors, (226), 4 states have call predecessors, (226), 3 states have return successors, (225), 3 states have call predecessors, (225), 3 states have call successors, (225) Word has length 979 [2021-11-21 01:38:37,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:38:37,831 INFO L225 Difference]: With dead ends: 5480 [2021-11-21 01:38:37,832 INFO L226 Difference]: Without dead ends: 5478 [2021-11-21 01:38:37,836 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 984 GetRequests, 975 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-11-21 01:38:37,837 INFO L933 BasicCegarLoop]: 4848 mSDtfsCounter, 2874 mSDsluCounter, 15881 mSDsCounter, 0 mSdLazyCounter, 1838 mSolverCounterSat, 12 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2877 SdHoareTripleChecker+Valid, 20561 SdHoareTripleChecker+Invalid, 1852 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 1838 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:38:37,837 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2877 Valid, 20561 Invalid, 1852 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [12 Valid, 1838 Invalid, 2 Unknown, 0 Unchecked, 15.2s Time] [2021-11-21 01:38:37,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5478 states. [2021-11-21 01:38:38,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5478 to 5473. [2021-11-21 01:38:38,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5473 states, 3380 states have (on average 1.2375739644970414) internal successors, (4183), 3394 states have internal predecessors, (4183), 1998 states have call successors, (1998), 92 states have call predecessors, (1998), 94 states have return successors, (2040), 1990 states have call predecessors, (2040), 1997 states have call successors, (2040) [2021-11-21 01:38:38,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5473 states to 5473 states and 8221 transitions. [2021-11-21 01:38:38,680 INFO L78 Accepts]: Start accepts. Automaton has 5473 states and 8221 transitions. Word has length 979 [2021-11-21 01:38:38,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:38:38,681 INFO L470 AbstractCegarLoop]: Abstraction has 5473 states and 8221 transitions. [2021-11-21 01:38:38,682 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 44.57142857142857) internal successors, (312), 6 states have internal predecessors, (312), 3 states have call successors, (226), 4 states have call predecessors, (226), 3 states have return successors, (225), 3 states have call predecessors, (225), 3 states have call successors, (225) [2021-11-21 01:38:38,682 INFO L276 IsEmpty]: Start isEmpty. Operand 5473 states and 8221 transitions. [2021-11-21 01:38:38,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 978 [2021-11-21 01:38:38,699 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:38:38,700 INFO L514 BasicCegarLoop]: trace histogram [210, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:38:38,744 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:38:38,913 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:38:38,914 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:38:38,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:38:38,915 INFO L85 PathProgramCache]: Analyzing trace with hash -879931956, now seen corresponding path program 1 times [2021-11-21 01:38:38,915 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:38:38,915 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [820707297] [2021-11-21 01:38:38,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:38:38,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:38:39,181 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:38:39,182 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1515969595] [2021-11-21 01:38:39,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:38:39,182 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:38:39,183 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:38:39,183 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:38:39,203 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:38:40,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:38:40,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 3259 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:38:40,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:38:42,193 INFO L134 CoverageAnalysis]: Checked inductivity of 43900 backedges. 832 proven. 0 refuted. 0 times theorem prover too weak. 43068 trivial. 0 not checked. [2021-11-21 01:38:42,193 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:38:42,194 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:38:42,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [820707297] [2021-11-21 01:38:42,194 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:38:42,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1515969595] [2021-11-21 01:38:42,194 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1515969595] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:38:42,194 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:38:42,195 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:38:42,195 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911166856] [2021-11-21 01:38:42,195 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:38:42,197 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:38:42,197 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:38:42,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:38:42,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:38:42,199 INFO L87 Difference]: Start difference. First operand 5473 states and 8221 transitions. Second operand has 5 states, 5 states have (on average 63.0) internal successors, (315), 5 states have internal predecessors, (315), 3 states have call successors, (224), 3 states have call predecessors, (224), 3 states have return successors, (223), 3 states have call predecessors, (223), 3 states have call successors, (223) [2021-11-21 01:38:44,215 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:38:46,269 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:38:57,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:38:57,290 INFO L93 Difference]: Finished difference Result 10315 states and 15583 transitions. [2021-11-21 01:38:57,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:38:57,293 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 63.0) internal successors, (315), 5 states have internal predecessors, (315), 3 states have call successors, (224), 3 states have call predecessors, (224), 3 states have return successors, (223), 3 states have call predecessors, (223), 3 states have call successors, (223) Word has length 977 [2021-11-21 01:38:57,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:38:57,329 INFO L225 Difference]: With dead ends: 10315 [2021-11-21 01:38:57,329 INFO L226 Difference]: Without dead ends: 5467 [2021-11-21 01:38:57,351 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 977 GetRequests, 973 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:38:57,351 INFO L933 BasicCegarLoop]: 3497 mSDtfsCounter, 2146 mSDsluCounter, 6357 mSDsCounter, 0 mSdLazyCounter, 2565 mSolverCounterSat, 26 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2147 SdHoareTripleChecker+Valid, 9780 SdHoareTripleChecker+Invalid, 2593 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 2565 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.7s IncrementalHoareTripleChecker+Time [2021-11-21 01:38:57,352 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2147 Valid, 9780 Invalid, 2593 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 2565 Invalid, 2 Unknown, 0 Unchecked, 14.7s Time] [2021-11-21 01:38:57,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5467 states. [2021-11-21 01:38:58,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5467 to 5467. [2021-11-21 01:38:58,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5467 states, 3377 states have (on average 1.2368966538347645) internal successors, (4177), 3391 states have internal predecessors, (4177), 1995 states have call successors, (1995), 92 states have call predecessors, (1995), 94 states have return successors, (2037), 1987 states have call predecessors, (2037), 1994 states have call successors, (2037) [2021-11-21 01:38:58,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5467 states to 5467 states and 8209 transitions. [2021-11-21 01:38:58,262 INFO L78 Accepts]: Start accepts. Automaton has 5467 states and 8209 transitions. Word has length 977 [2021-11-21 01:38:58,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:38:58,263 INFO L470 AbstractCegarLoop]: Abstraction has 5467 states and 8209 transitions. [2021-11-21 01:38:58,264 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 63.0) internal successors, (315), 5 states have internal predecessors, (315), 3 states have call successors, (224), 3 states have call predecessors, (224), 3 states have return successors, (223), 3 states have call predecessors, (223), 3 states have call successors, (223) [2021-11-21 01:38:58,264 INFO L276 IsEmpty]: Start isEmpty. Operand 5467 states and 8209 transitions. [2021-11-21 01:38:58,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 978 [2021-11-21 01:38:58,282 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:38:58,283 INFO L514 BasicCegarLoop]: trace histogram [210, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:38:58,322 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:38:58,497 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:38:58,498 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:38:58,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:38:58,498 INFO L85 PathProgramCache]: Analyzing trace with hash -1776354375, now seen corresponding path program 1 times [2021-11-21 01:38:58,498 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:38:58,498 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [901460412] [2021-11-21 01:38:58,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:38:58,499 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:38:58,734 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:38:58,735 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1819771639] [2021-11-21 01:38:58,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:38:58,735 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:38:58,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:38:58,736 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:38:58,753 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:38:59,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:38:59,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 3258 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 01:38:59,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:39:01,637 INFO L134 CoverageAnalysis]: Checked inductivity of 43902 backedges. 836 proven. 0 refuted. 0 times theorem prover too weak. 43066 trivial. 0 not checked. [2021-11-21 01:39:01,638 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:39:01,638 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:39:01,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [901460412] [2021-11-21 01:39:01,638 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:39:01,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1819771639] [2021-11-21 01:39:01,639 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1819771639] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:39:01,639 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:39:01,639 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:39:01,639 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016264434] [2021-11-21 01:39:01,640 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:39:01,641 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:39:01,641 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:39:01,642 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:39:01,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:39:01,642 INFO L87 Difference]: Start difference. First operand 5467 states and 8209 transitions. Second operand has 5 states, 5 states have (on average 63.6) internal successors, (318), 5 states have internal predecessors, (318), 3 states have call successors, (224), 3 states have call predecessors, (224), 3 states have return successors, (223), 3 states have call predecessors, (223), 3 states have call successors, (223) [2021-11-21 01:39:03,656 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:39:05,709 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:39:15,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:39:15,032 INFO L93 Difference]: Finished difference Result 10280 states and 15535 transitions. [2021-11-21 01:39:15,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:39:15,036 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 63.6) internal successors, (318), 5 states have internal predecessors, (318), 3 states have call successors, (224), 3 states have call predecessors, (224), 3 states have return successors, (223), 3 states have call predecessors, (223), 3 states have call successors, (223) Word has length 977 [2021-11-21 01:39:15,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:39:15,063 INFO L225 Difference]: With dead ends: 10280 [2021-11-21 01:39:15,063 INFO L226 Difference]: Without dead ends: 5467 [2021-11-21 01:39:15,077 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 977 GetRequests, 973 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:39:15,078 INFO L933 BasicCegarLoop]: 3470 mSDtfsCounter, 1668 mSDsluCounter, 7239 mSDsCounter, 0 mSdLazyCounter, 2036 mSolverCounterSat, 29 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1671 SdHoareTripleChecker+Valid, 10637 SdHoareTripleChecker+Invalid, 2067 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 2036 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:39:15,078 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1671 Valid, 10637 Invalid, 2067 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 2036 Invalid, 2 Unknown, 0 Unchecked, 13.0s Time] [2021-11-21 01:39:15,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5467 states. [2021-11-21 01:39:15,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5467 to 5467. [2021-11-21 01:39:15,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5467 states, 3377 states have (on average 1.2354160497482973) internal successors, (4172), 3391 states have internal predecessors, (4172), 1995 states have call successors, (1995), 92 states have call predecessors, (1995), 94 states have return successors, (2037), 1987 states have call predecessors, (2037), 1994 states have call successors, (2037) [2021-11-21 01:39:15,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5467 states to 5467 states and 8204 transitions. [2021-11-21 01:39:15,852 INFO L78 Accepts]: Start accepts. Automaton has 5467 states and 8204 transitions. Word has length 977 [2021-11-21 01:39:15,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:39:15,853 INFO L470 AbstractCegarLoop]: Abstraction has 5467 states and 8204 transitions. [2021-11-21 01:39:15,854 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 63.6) internal successors, (318), 5 states have internal predecessors, (318), 3 states have call successors, (224), 3 states have call predecessors, (224), 3 states have return successors, (223), 3 states have call predecessors, (223), 3 states have call successors, (223) [2021-11-21 01:39:15,854 INFO L276 IsEmpty]: Start isEmpty. Operand 5467 states and 8204 transitions. [2021-11-21 01:39:15,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 986 [2021-11-21 01:39:15,869 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:39:15,870 INFO L514 BasicCegarLoop]: trace histogram [210, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:39:15,913 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-21 01:39:16,086 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:39:16,087 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:39:16,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:39:16,087 INFO L85 PathProgramCache]: Analyzing trace with hash -1942340039, now seen corresponding path program 1 times [2021-11-21 01:39:16,087 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:39:16,087 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1321152779] [2021-11-21 01:39:16,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:39:16,088 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:39:16,286 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:39:16,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1112590224] [2021-11-21 01:39:16,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:39:16,287 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:39:16,287 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:39:16,288 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:39:16,304 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:39:17,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:39:17,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 3282 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:39:17,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:39:19,227 INFO L134 CoverageAnalysis]: Checked inductivity of 43906 backedges. 834 proven. 0 refuted. 0 times theorem prover too weak. 43072 trivial. 0 not checked. [2021-11-21 01:39:19,228 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:39:19,228 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:39:19,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1321152779] [2021-11-21 01:39:19,228 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:39:19,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1112590224] [2021-11-21 01:39:19,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1112590224] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:39:19,229 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:39:19,229 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:39:19,230 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376642977] [2021-11-21 01:39:19,230 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:39:19,231 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:39:19,232 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:39:19,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:39:19,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:39:19,232 INFO L87 Difference]: Start difference. First operand 5467 states and 8204 transitions. Second operand has 5 states, 5 states have (on average 63.6) internal successors, (318), 5 states have internal predecessors, (318), 3 states have call successors, (225), 3 states have call predecessors, (225), 3 states have return successors, (224), 3 states have call predecessors, (224), 3 states have call successors, (224) [2021-11-21 01:39:21,246 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:39:23,322 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:39:35,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:39:35,779 INFO L93 Difference]: Finished difference Result 10272 states and 15514 transitions. [2021-11-21 01:39:35,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:39:35,783 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 63.6) internal successors, (318), 5 states have internal predecessors, (318), 3 states have call successors, (225), 3 states have call predecessors, (225), 3 states have return successors, (224), 3 states have call predecessors, (224), 3 states have call successors, (224) Word has length 985 [2021-11-21 01:39:35,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:39:35,809 INFO L225 Difference]: With dead ends: 10272 [2021-11-21 01:39:35,809 INFO L226 Difference]: Without dead ends: 5457 [2021-11-21 01:39:35,825 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 985 GetRequests, 981 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:39:35,826 INFO L933 BasicCegarLoop]: 3496 mSDtfsCounter, 2129 mSDsluCounter, 4999 mSDsCounter, 0 mSdLazyCounter, 2538 mSolverCounterSat, 26 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2130 SdHoareTripleChecker+Valid, 8430 SdHoareTripleChecker+Invalid, 2566 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 2538 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 16.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:39:35,826 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2130 Valid, 8430 Invalid, 2566 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 2538 Invalid, 2 Unknown, 0 Unchecked, 16.1s Time] [2021-11-21 01:39:35,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5457 states. [2021-11-21 01:39:36,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5457 to 5457. [2021-11-21 01:39:36,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5457 states, 3372 states have (on average 1.234282325029656) internal successors, (4162), 3386 states have internal predecessors, (4162), 1990 states have call successors, (1990), 92 states have call predecessors, (1990), 94 states have return successors, (2032), 1982 states have call predecessors, (2032), 1989 states have call successors, (2032) [2021-11-21 01:39:36,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5457 states to 5457 states and 8184 transitions. [2021-11-21 01:39:36,595 INFO L78 Accepts]: Start accepts. Automaton has 5457 states and 8184 transitions. Word has length 985 [2021-11-21 01:39:36,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:39:36,596 INFO L470 AbstractCegarLoop]: Abstraction has 5457 states and 8184 transitions. [2021-11-21 01:39:36,597 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 63.6) internal successors, (318), 5 states have internal predecessors, (318), 3 states have call successors, (225), 3 states have call predecessors, (225), 3 states have return successors, (224), 3 states have call predecessors, (224), 3 states have call successors, (224) [2021-11-21 01:39:36,597 INFO L276 IsEmpty]: Start isEmpty. Operand 5457 states and 8184 transitions. [2021-11-21 01:39:36,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 986 [2021-11-21 01:39:36,645 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:39:36,646 INFO L514 BasicCegarLoop]: trace histogram [210, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:39:36,670 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:39:36,846 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:39:36,846 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:39:36,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:39:36,847 INFO L85 PathProgramCache]: Analyzing trace with hash 1669722905, now seen corresponding path program 1 times [2021-11-21 01:39:36,847 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:39:36,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1941127997] [2021-11-21 01:39:36,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:39:36,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:39:37,027 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:39:37,028 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2060829591] [2021-11-21 01:39:37,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:39:37,028 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:39:37,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:39:37,029 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:39:37,045 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:39:38,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:39:38,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 3280 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 01:39:38,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:39:40,092 INFO L134 CoverageAnalysis]: Checked inductivity of 43914 backedges. 846 proven. 0 refuted. 0 times theorem prover too weak. 43068 trivial. 0 not checked. [2021-11-21 01:39:40,092 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:39:40,092 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:39:40,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1941127997] [2021-11-21 01:39:40,093 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:39:40,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2060829591] [2021-11-21 01:39:40,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2060829591] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:39:40,093 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:39:40,093 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:39:40,093 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1594674089] [2021-11-21 01:39:40,093 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:39:40,095 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:39:40,095 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:39:40,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:39:40,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:39:40,096 INFO L87 Difference]: Start difference. First operand 5457 states and 8184 transitions. Second operand has 5 states, 5 states have (on average 64.4) internal successors, (322), 5 states have internal predecessors, (322), 3 states have call successors, (226), 3 states have call predecessors, (226), 3 states have return successors, (225), 3 states have call predecessors, (225), 3 states have call successors, (225) [2021-11-21 01:39:42,110 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:39:44,195 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:39:55,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:39:55,013 INFO L93 Difference]: Finished difference Result 10145 states and 15312 transitions. [2021-11-21 01:39:55,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:39:55,017 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 64.4) internal successors, (322), 5 states have internal predecessors, (322), 3 states have call successors, (226), 3 states have call predecessors, (226), 3 states have return successors, (225), 3 states have call predecessors, (225), 3 states have call successors, (225) Word has length 985 [2021-11-21 01:39:55,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:39:55,046 INFO L225 Difference]: With dead ends: 10145 [2021-11-21 01:39:55,047 INFO L226 Difference]: Without dead ends: 5457 [2021-11-21 01:39:55,064 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 985 GetRequests, 981 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:39:55,065 INFO L933 BasicCegarLoop]: 3469 mSDtfsCounter, 1638 mSDsluCounter, 7241 mSDsCounter, 0 mSdLazyCounter, 2032 mSolverCounterSat, 29 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1641 SdHoareTripleChecker+Valid, 10638 SdHoareTripleChecker+Invalid, 2063 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 2032 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:39:55,065 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1641 Valid, 10638 Invalid, 2063 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 2032 Invalid, 2 Unknown, 0 Unchecked, 14.5s Time] [2021-11-21 01:39:55,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5457 states. [2021-11-21 01:39:55,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5457 to 5457. [2021-11-21 01:39:55,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5457 states, 3372 states have (on average 1.232799525504152) internal successors, (4157), 3386 states have internal predecessors, (4157), 1990 states have call successors, (1990), 92 states have call predecessors, (1990), 94 states have return successors, (2032), 1982 states have call predecessors, (2032), 1989 states have call successors, (2032) [2021-11-21 01:39:55,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5457 states to 5457 states and 8179 transitions. [2021-11-21 01:39:55,977 INFO L78 Accepts]: Start accepts. Automaton has 5457 states and 8179 transitions. Word has length 985 [2021-11-21 01:39:55,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:39:55,978 INFO L470 AbstractCegarLoop]: Abstraction has 5457 states and 8179 transitions. [2021-11-21 01:39:55,979 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 64.4) internal successors, (322), 5 states have internal predecessors, (322), 3 states have call successors, (226), 3 states have call predecessors, (226), 3 states have return successors, (225), 3 states have call predecessors, (225), 3 states have call successors, (225) [2021-11-21 01:39:55,979 INFO L276 IsEmpty]: Start isEmpty. Operand 5457 states and 8179 transitions. [2021-11-21 01:39:56,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 990 [2021-11-21 01:39:56,003 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:39:56,004 INFO L514 BasicCegarLoop]: trace histogram [210, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:39:56,048 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:39:56,217 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-21 01:39:56,218 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:39:56,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:39:56,219 INFO L85 PathProgramCache]: Analyzing trace with hash -594726714, now seen corresponding path program 1 times [2021-11-21 01:39:56,219 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:39:56,219 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1494550053] [2021-11-21 01:39:56,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:39:56,219 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:39:56,406 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:39:56,406 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1177100171] [2021-11-21 01:39:56,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:39:56,407 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:39:56,407 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:39:56,408 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:39:56,413 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:39:57,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:39:57,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 3292 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:39:57,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:39:59,234 INFO L134 CoverageAnalysis]: Checked inductivity of 43914 backedges. 846 proven. 0 refuted. 0 times theorem prover too weak. 43068 trivial. 0 not checked. [2021-11-21 01:39:59,234 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:39:59,234 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:39:59,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1494550053] [2021-11-21 01:39:59,234 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:39:59,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1177100171] [2021-11-21 01:39:59,234 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1177100171] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:39:59,234 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:39:59,235 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:39:59,235 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316742466] [2021-11-21 01:39:59,235 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:39:59,236 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:39:59,236 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:39:59,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:39:59,236 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:39:59,237 INFO L87 Difference]: Start difference. First operand 5457 states and 8179 transitions. Second operand has 5 states, 5 states have (on average 64.8) internal successors, (324), 5 states have internal predecessors, (324), 3 states have call successors, (227), 3 states have call predecessors, (227), 3 states have return successors, (226), 3 states have call predecessors, (226), 3 states have call successors, (226) [2021-11-21 01:40:01,248 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:40:03,324 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:40:17,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:40:17,498 INFO L93 Difference]: Finished difference Result 10023 states and 15120 transitions. [2021-11-21 01:40:17,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:40:17,503 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 64.8) internal successors, (324), 5 states have internal predecessors, (324), 3 states have call successors, (227), 3 states have call predecessors, (227), 3 states have return successors, (226), 3 states have call predecessors, (226), 3 states have call successors, (226) Word has length 989 [2021-11-21 01:40:17,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:40:17,530 INFO L225 Difference]: With dead ends: 10023 [2021-11-21 01:40:17,531 INFO L226 Difference]: Without dead ends: 5219 [2021-11-21 01:40:17,549 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 989 GetRequests, 985 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:40:17,550 INFO L933 BasicCegarLoop]: 3495 mSDtfsCounter, 2099 mSDsluCounter, 6361 mSDsCounter, 0 mSdLazyCounter, 2557 mSolverCounterSat, 26 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2100 SdHoareTripleChecker+Valid, 9782 SdHoareTripleChecker+Invalid, 2585 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 2557 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.9s IncrementalHoareTripleChecker+Time [2021-11-21 01:40:17,551 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2100 Valid, 9782 Invalid, 2585 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 2557 Invalid, 2 Unknown, 0 Unchecked, 17.9s Time] [2021-11-21 01:40:17,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5219 states. [2021-11-21 01:40:18,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5219 to 5219. [2021-11-21 01:40:18,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5219 states, 3197 states have (on average 1.2252111354394746) internal successors, (3917), 3211 states have internal predecessors, (3917), 1929 states have call successors, (1929), 90 states have call predecessors, (1929), 92 states have return successors, (1971), 1921 states have call predecessors, (1971), 1928 states have call successors, (1971) [2021-11-21 01:40:18,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5219 states to 5219 states and 7817 transitions. [2021-11-21 01:40:18,301 INFO L78 Accepts]: Start accepts. Automaton has 5219 states and 7817 transitions. Word has length 989 [2021-11-21 01:40:18,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:40:18,303 INFO L470 AbstractCegarLoop]: Abstraction has 5219 states and 7817 transitions. [2021-11-21 01:40:18,303 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 64.8) internal successors, (324), 5 states have internal predecessors, (324), 3 states have call successors, (227), 3 states have call predecessors, (227), 3 states have return successors, (226), 3 states have call predecessors, (226), 3 states have call successors, (226) [2021-11-21 01:40:18,303 INFO L276 IsEmpty]: Start isEmpty. Operand 5219 states and 7817 transitions. [2021-11-21 01:40:18,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 990 [2021-11-21 01:40:18,319 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:40:18,320 INFO L514 BasicCegarLoop]: trace histogram [210, 5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:40:18,358 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-21 01:40:18,533 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-21 01:40:18,534 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:40:18,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:40:18,534 INFO L85 PathProgramCache]: Analyzing trace with hash 1550657075, now seen corresponding path program 1 times [2021-11-21 01:40:18,534 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:40:18,534 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2142644131] [2021-11-21 01:40:18,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:40:18,535 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:40:18,708 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:40:18,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [362913727] [2021-11-21 01:40:18,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:40:18,709 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:40:18,709 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:40:18,710 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:40:18,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3c59618-72ad-4da3-9c38-9f389884fbe1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:40:19,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:40:19,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 3291 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-21 01:40:19,684 INFO L286 TraceCheckSpWp]: Computing forward predicates...