./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/rekh_nxt.2.M1-1.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_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/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_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/rekh_nxt.2.M1-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/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_80151831-5f9d-407c-836c-1d607ed1e061/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 e0278abdbbb57b3938e33a237527cf3a8d14feaf8eba047d58da36569d27728f --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:12:35,388 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:12:35,390 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:12:35,436 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:12:35,437 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:12:35,440 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:12:35,442 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:12:35,446 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:12:35,448 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:12:35,454 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:12:35,455 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:12:35,456 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:12:35,457 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:12:35,459 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:12:35,462 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:12:35,469 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:12:35,471 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:12:35,472 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:12:35,474 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:12:35,483 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:12:35,485 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:12:35,487 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:12:35,490 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:12:35,491 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:12:35,499 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:12:35,500 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:12:35,500 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:12:35,502 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:12:35,503 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:12:35,504 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:12:35,505 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:12:35,506 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:12:35,508 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:12:35,509 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:12:35,511 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:12:35,511 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:12:35,512 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:12:35,512 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:12:35,512 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:12:35,513 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:12:35,514 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:12:35,515 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:12:35,560 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:12:35,561 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:12:35,561 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:12:35,562 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:12:35,569 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:12:35,569 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:12:35,569 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:12:35,570 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:12:35,570 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:12:35,570 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:12:35,571 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:12:35,571 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:12:35,571 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:12:35,572 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:12:35,572 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:12:35,572 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:12:35,572 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:12:35,573 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:12:35,573 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:12:35,573 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:12:35,574 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:12:35,574 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:12:35,574 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:12:35,574 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:12:35,575 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:12:35,575 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:12:35,575 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:12:35,575 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:12:35,575 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:12:35,576 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:12:35,576 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:12:35,576 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:12:35,576 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:12:35,577 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:12:35,577 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:12:35,577 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:12:35,577 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:12:35,578 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:12:35,578 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:12:35,578 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:12:35,578 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:12:35,578 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_80151831-5f9d-407c-836c-1d607ed1e061/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e0278abdbbb57b3938e33a237527cf3a8d14feaf8eba047d58da36569d27728f [2021-11-20 23:12:35,803 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:12:35,828 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:12:35,831 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:12:35,832 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:12:35,833 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:12:35,834 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/seq-mthreaded/rekh_nxt.2.M1-1.c [2021-11-20 23:12:35,907 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/data/e2dcddf76/69efc1337dd44f5385abb37ca8930c48/FLAGed047404f [2021-11-20 23:12:36,535 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:12:36,536 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/sv-benchmarks/c/seq-mthreaded/rekh_nxt.2.M1-1.c [2021-11-20 23:12:36,558 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/data/e2dcddf76/69efc1337dd44f5385abb37ca8930c48/FLAGed047404f [2021-11-20 23:12:36,731 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/data/e2dcddf76/69efc1337dd44f5385abb37ca8930c48 [2021-11-20 23:12:36,734 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:12:36,735 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:12:36,737 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:12:36,737 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:12:36,752 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:12:36,753 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:12:36" (1/1) ... [2021-11-20 23:12:36,754 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6167c726 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:36, skipping insertion in model container [2021-11-20 23:12:36,754 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:12:36" (1/1) ... [2021-11-20 23:12:36,762 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:12:36,842 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:12:37,040 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_80151831-5f9d-407c-836c-1d607ed1e061/sv-benchmarks/c/seq-mthreaded/rekh_nxt.2.M1-1.c[1765,1778] [2021-11-20 23:12:37,462 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:12:37,473 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:12:37,486 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_80151831-5f9d-407c-836c-1d607ed1e061/sv-benchmarks/c/seq-mthreaded/rekh_nxt.2.M1-1.c[1765,1778] [2021-11-20 23:12:37,770 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:12:37,791 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:12:37,791 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:37 WrapperNode [2021-11-20 23:12:37,792 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:12:37,793 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:12:37,793 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:12:37,793 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:12:37,801 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:37" (1/1) ... [2021-11-20 23:12:37,878 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:37" (1/1) ... [2021-11-20 23:12:38,062 INFO L137 Inliner]: procedures = 60, calls = 2524, calls flagged for inlining = 22, calls inlined = 22, statements flattened = 4783 [2021-11-20 23:12:38,063 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:12:38,064 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:12:38,064 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:12:38,064 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:12:38,072 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:37" (1/1) ... [2021-11-20 23:12:38,073 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:37" (1/1) ... [2021-11-20 23:12:38,153 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:37" (1/1) ... [2021-11-20 23:12:38,153 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:37" (1/1) ... [2021-11-20 23:12:38,291 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:37" (1/1) ... [2021-11-20 23:12:38,308 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:37" (1/1) ... [2021-11-20 23:12:38,322 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:37" (1/1) ... [2021-11-20 23:12:38,343 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:12:38,344 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:12:38,345 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:12:38,345 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:12:38,346 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:37" (1/1) ... [2021-11-20 23:12:38,353 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:12:38,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:12:38,374 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:12:38,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:12:38,428 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:12:38,429 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_cs_t2 [2021-11-20 23:12:38,429 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_cs_t2 [2021-11-20 23:12:38,429 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_nxtway_gs_mode [2021-11-20 23:12:38,429 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_nxtway_gs_mode [2021-11-20 23:12:38,429 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-20 23:12:38,429 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_cs_t0 [2021-11-20 23:12:38,430 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_cs_t0 [2021-11-20 23:12:38,430 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_cs_t1 [2021-11-20 23:12:38,430 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_cs_t1 [2021-11-20 23:12:38,430 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_observer_obstacle_flag [2021-11-20 23:12:38,430 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_observer_obstacle_flag [2021-11-20 23:12:38,430 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_obstacle_flag [2021-11-20 23:12:38,431 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_obstacle_flag [2021-11-20 23:12:38,431 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-20 23:12:38,431 INFO L130 BoogieDeclarations]: Found specification of procedure nxt_motor_set_count [2021-11-20 23:12:38,431 INFO L138 BoogieDeclarations]: Found implementation of procedure nxt_motor_set_count [2021-11-20 23:12:38,431 INFO L130 BoogieDeclarations]: Found specification of procedure ecrobot_get_gyro_sensor [2021-11-20 23:12:38,431 INFO L138 BoogieDeclarations]: Found implementation of procedure ecrobot_get_gyro_sensor [2021-11-20 23:12:38,432 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_entry_pt_OSEK_Task_ts1 [2021-11-20 23:12:38,432 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_entry_pt_OSEK_Task_ts1 [2021-11-20 23:12:38,432 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_entry_pt_OSEK_Task_ts2 [2021-11-20 23:12:38,432 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_entry_pt_OSEK_Task_ts2 [2021-11-20 23:12:38,432 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-20 23:12:38,432 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_entry_pt_OSEK_Task_Background [2021-11-20 23:12:38,433 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_entry_pt_OSEK_Task_Background [2021-11-20 23:12:38,433 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-20 23:12:38,433 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2021-11-20 23:12:38,433 INFO L138 BoogieDeclarations]: Found implementation of procedure assert [2021-11-20 23:12:38,433 INFO L130 BoogieDeclarations]: Found specification of procedure nxt_motor_set_speed [2021-11-20 23:12:38,433 INFO L138 BoogieDeclarations]: Found implementation of procedure nxt_motor_set_speed [2021-11-20 23:12:38,433 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_obstacle_flag [2021-11-20 23:12:38,434 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_obstacle_flag [2021-11-20 23:12:38,434 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-20 23:12:38,434 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-20 23:12:38,434 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:12:38,434 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:12:38,434 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:12:38,435 INFO L130 BoogieDeclarations]: Found specification of procedure ecrobot_get_systick_ms [2021-11-20 23:12:38,435 INFO L138 BoogieDeclarations]: Found implementation of procedure ecrobot_get_systick_ms [2021-11-20 23:12:38,435 INFO L130 BoogieDeclarations]: Found specification of procedure nxt_motor_get_count [2021-11-20 23:12:38,435 INFO L138 BoogieDeclarations]: Found implementation of procedure nxt_motor_get_count [2021-11-20 23:12:38,435 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_nxtway_gs_mode [2021-11-20 23:12:38,435 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_nxtway_gs_mode [2021-11-20 23:12:39,051 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:12:39,052 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:12:47,223 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:12:47,571 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:12:47,571 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-20 23:12:47,576 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:12:47 BoogieIcfgContainer [2021-11-20 23:12:47,576 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:12:47,578 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:12:47,578 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:12:47,581 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:12:47,581 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:12:36" (1/3) ... [2021-11-20 23:12:47,582 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ef4047f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:12:47, skipping insertion in model container [2021-11-20 23:12:47,582 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:12:37" (2/3) ... [2021-11-20 23:12:47,583 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ef4047f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:12:47, skipping insertion in model container [2021-11-20 23:12:47,583 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:12:47" (3/3) ... [2021-11-20 23:12:47,584 INFO L111 eAbstractionObserver]: Analyzing ICFG rekh_nxt.2.M1-1.c [2021-11-20 23:12:47,589 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:12:47,589 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 23:12:47,642 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:12:47,649 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 [2021-11-20 23:12:47,650 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 23:12:47,709 INFO L276 IsEmpty]: Start isEmpty. Operand has 1893 states, 1101 states have (on average 1.2052679382379654) internal successors, (1327), 1106 states have internal predecessors, (1327), 772 states have call successors, (772), 18 states have call predecessors, (772), 18 states have return successors, (772), 770 states have call predecessors, (772), 772 states have call successors, (772) [2021-11-20 23:12:47,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 883 [2021-11-20 23:12:47,764 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:12:47,765 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] [2021-11-20 23:12:47,766 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:12:47,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:12:47,772 INFO L85 PathProgramCache]: Analyzing trace with hash 962128900, now seen corresponding path program 1 times [2021-11-20 23:12:47,781 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:12:47,781 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1063121055] [2021-11-20 23:12:47,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:12:47,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:12:48,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:12:49,396 INFO L134 CoverageAnalysis]: Checked inductivity of 43472 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43472 trivial. 0 not checked. [2021-11-20 23:12:49,397 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:12:49,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1063121055] [2021-11-20 23:12:49,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1063121055] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:12:49,399 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:12:49,399 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:12:49,400 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694796108] [2021-11-20 23:12:49,401 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:12:49,408 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:12:49,409 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:12:49,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:12:49,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:12:49,453 INFO L87 Difference]: Start difference. First operand has 1893 states, 1101 states have (on average 1.2052679382379654) internal successors, (1327), 1106 states have internal predecessors, (1327), 772 states have call successors, (772), 18 states have call predecessors, (772), 18 states have return successors, (772), 770 states have call predecessors, (772), 772 states have call successors, (772) Second operand has 3 states, 3 states have (on average 83.66666666666667) internal successors, (251), 3 states have internal predecessors, (251), 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) [2021-11-20 23:12:51,484 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 [] [2021-11-20 23:12:53,614 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 [] [2021-11-20 23:12:53,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:12:53,888 INFO L93 Difference]: Finished difference Result 3316 states and 5086 transitions. [2021-11-20 23:12:53,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:12:53,891 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 83.66666666666667) internal successors, (251), 3 states have internal predecessors, (251), 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 882 [2021-11-20 23:12:53,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:12:53,926 INFO L225 Difference]: With dead ends: 3316 [2021-11-20 23:12:53,926 INFO L226 Difference]: Without dead ends: 1891 [2021-11-20 23:12:53,941 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 [2021-11-20 23:12:53,944 INFO L933 BasicCegarLoop]: 2841 mSDtfsCounter, 29 mSDsluCounter, 2808 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 3 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 5633 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:12:53,945 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 5633 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 47 Invalid, 2 Unknown, 0 Unchecked, 4.2s Time] [2021-11-20 23:12:53,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1891 states. [2021-11-20 23:12:54,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1891 to 1891. [2021-11-20 23:12:54,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1891 states, 1100 states have (on average 1.2036363636363636) internal successors, (1324), 1105 states have internal predecessors, (1324), 772 states have call successors, (772), 18 states have call predecessors, (772), 18 states have return successors, (771), 769 states have call predecessors, (771), 771 states have call successors, (771) [2021-11-20 23:12:54,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1891 states to 1891 states and 2867 transitions. [2021-11-20 23:12:54,669 INFO L78 Accepts]: Start accepts. Automaton has 1891 states and 2867 transitions. Word has length 882 [2021-11-20 23:12:54,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:12:54,674 INFO L470 AbstractCegarLoop]: Abstraction has 1891 states and 2867 transitions. [2021-11-20 23:12:54,675 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 83.66666666666667) internal successors, (251), 3 states have internal predecessors, (251), 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) [2021-11-20 23:12:54,676 INFO L276 IsEmpty]: Start isEmpty. Operand 1891 states and 2867 transitions. [2021-11-20 23:12:54,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 889 [2021-11-20 23:12:54,716 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:12:54,717 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] [2021-11-20 23:12:54,718 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:12:54,718 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:12:54,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:12:54,719 INFO L85 PathProgramCache]: Analyzing trace with hash 1618040932, now seen corresponding path program 1 times [2021-11-20 23:12:54,720 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:12:54,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466883700] [2021-11-20 23:12:54,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:12:54,721 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:12:55,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:12:56,141 INFO L134 CoverageAnalysis]: Checked inductivity of 43474 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43474 trivial. 0 not checked. [2021-11-20 23:12:56,141 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:12:56,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466883700] [2021-11-20 23:12:56,144 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1466883700] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:12:56,145 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:12:56,145 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 23:12:56,145 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828294925] [2021-11-20 23:12:56,146 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:12:56,151 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:12:56,151 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:12:56,152 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:12:56,152 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:12:56,153 INFO L87 Difference]: Start difference. First operand 1891 states and 2867 transitions. Second operand has 5 states, 4 states have (on average 63.0) internal successors, (252), 5 states have internal predecessors, (252), 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) [2021-11-20 23:12:58,167 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 [] [2021-11-20 23:13:00,243 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 [] [2021-11-20 23:13:05,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:05,968 INFO L93 Difference]: Finished difference Result 3550 states and 5403 transitions. [2021-11-20 23:13:05,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:13:05,970 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 63.0) internal successors, (252), 5 states have internal predecessors, (252), 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 888 [2021-11-20 23:13:05,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:05,990 INFO L225 Difference]: With dead ends: 3550 [2021-11-20 23:13:05,990 INFO L226 Difference]: Without dead ends: 2129 [2021-11-20 23:13:06,000 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 [2021-11-20 23:13:06,001 INFO L933 BasicCegarLoop]: 3163 mSDtfsCounter, 2486 mSDsluCounter, 4073 mSDsCounter, 0 mSdLazyCounter, 2136 mSolverCounterSat, 35 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2486 SdHoareTripleChecker+Valid, 7192 SdHoareTripleChecker+Invalid, 2173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 2136 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:06,002 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2486 Valid, 7192 Invalid, 2173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 2136 Invalid, 2 Unknown, 0 Unchecked, 9.5s Time] [2021-11-20 23:13:06,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2129 states. [2021-11-20 23:13:06,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2129 to 2129. [2021-11-20 23:13:06,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2129 states, 1275 states have (on average 1.223529411764706) internal successors, (1560), 1280 states have internal predecessors, (1560), 829 states have call successors, (829), 24 states have call predecessors, (829), 24 states have return successors, (828), 826 states have call predecessors, (828), 828 states have call successors, (828) [2021-11-20 23:13:06,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2129 states to 2129 states and 3217 transitions. [2021-11-20 23:13:06,456 INFO L78 Accepts]: Start accepts. Automaton has 2129 states and 3217 transitions. Word has length 888 [2021-11-20 23:13:06,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:06,459 INFO L470 AbstractCegarLoop]: Abstraction has 2129 states and 3217 transitions. [2021-11-20 23:13:06,463 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 63.0) internal successors, (252), 5 states have internal predecessors, (252), 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) [2021-11-20 23:13:06,463 INFO L276 IsEmpty]: Start isEmpty. Operand 2129 states and 3217 transitions. [2021-11-20 23:13:06,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 893 [2021-11-20 23:13:06,493 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:06,494 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] [2021-11-20 23:13:06,494 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-20 23:13:06,494 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:06,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:06,495 INFO L85 PathProgramCache]: Analyzing trace with hash -174303736, now seen corresponding path program 1 times [2021-11-20 23:13:06,496 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:06,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [764386530] [2021-11-20 23:13:06,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:06,498 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:06,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:07,131 INFO L134 CoverageAnalysis]: Checked inductivity of 43474 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43474 trivial. 0 not checked. [2021-11-20 23:13:07,131 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:07,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [764386530] [2021-11-20 23:13:07,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [764386530] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:07,132 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:07,132 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-20 23:13:07,132 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083925443] [2021-11-20 23:13:07,132 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:07,134 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-20 23:13:07,134 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:07,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-20 23:13:07,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:13:07,135 INFO L87 Difference]: Start difference. First operand 2129 states and 3217 transitions. Second operand has 6 states, 6 states have (on average 42.333333333333336) internal successors, (254), 5 states have internal predecessors, (254), 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) [2021-11-20 23:13:09,148 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 [] [2021-11-20 23:13:12,669 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 [] [2021-11-20 23:13:25,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:25,257 INFO L93 Difference]: Finished difference Result 3705 states and 5614 transitions. [2021-11-20 23:13:25,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-20 23:13:25,260 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 42.333333333333336) internal successors, (254), 5 states have internal predecessors, (254), 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 892 [2021-11-20 23:13:25,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:25,292 INFO L225 Difference]: With dead ends: 3705 [2021-11-20 23:13:25,292 INFO L226 Difference]: Without dead ends: 3684 [2021-11-20 23:13:25,295 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 [2021-11-20 23:13:25,296 INFO L933 BasicCegarLoop]: 2735 mSDtfsCounter, 2107 mSDsluCounter, 7503 mSDsCounter, 0 mSdLazyCounter, 4792 mSolverCounterSat, 1656 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2606 SdHoareTripleChecker+Valid, 10210 SdHoareTripleChecker+Invalid, 6450 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1656 IncrementalHoareTripleChecker+Valid, 4792 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:25,297 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2606 Valid, 10210 Invalid, 6450 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1656 Valid, 4792 Invalid, 2 Unknown, 0 Unchecked, 17.6s Time] [2021-11-20 23:13:25,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3684 states. [2021-11-20 23:13:25,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3684 to 2996. [2021-11-20 23:13:25,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2996 states, 1811 states have (on average 1.2302595251242407) internal successors, (2228), 1817 states have internal predecessors, (2228), 1149 states have call successors, (1149), 34 states have call predecessors, (1149), 35 states have return successors, (1171), 1146 states have call predecessors, (1171), 1148 states have call successors, (1171) [2021-11-20 23:13:25,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2996 states to 2996 states and 4548 transitions. [2021-11-20 23:13:25,850 INFO L78 Accepts]: Start accepts. Automaton has 2996 states and 4548 transitions. Word has length 892 [2021-11-20 23:13:25,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:25,852 INFO L470 AbstractCegarLoop]: Abstraction has 2996 states and 4548 transitions. [2021-11-20 23:13:25,852 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 42.333333333333336) internal successors, (254), 5 states have internal predecessors, (254), 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) [2021-11-20 23:13:25,853 INFO L276 IsEmpty]: Start isEmpty. Operand 2996 states and 4548 transitions. [2021-11-20 23:13:25,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 931 [2021-11-20 23:13:25,867 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:25,868 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] [2021-11-20 23:13:25,868 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-20 23:13:25,869 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:25,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:25,870 INFO L85 PathProgramCache]: Analyzing trace with hash -2031419123, now seen corresponding path program 1 times [2021-11-20 23:13:25,871 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:25,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [925822007] [2021-11-20 23:13:25,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:25,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:26,093 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:13:26,096 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [929456985] [2021-11-20 23:13:26,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:26,097 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:13:26,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:13:26,103 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:13:26,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:13:27,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:27,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 3049 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-20 23:13:27,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:13:28,721 INFO L134 CoverageAnalysis]: Checked inductivity of 43900 backedges. 832 proven. 0 refuted. 0 times theorem prover too weak. 43068 trivial. 0 not checked. [2021-11-20 23:13:28,721 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:13:28,721 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:28,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [925822007] [2021-11-20 23:13:28,724 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:13:28,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [929456985] [2021-11-20 23:13:28,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [929456985] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:28,727 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:28,728 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 23:13:28,728 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918415745] [2021-11-20 23:13:28,728 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:28,730 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:13:28,730 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:28,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:13:28,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:13:28,734 INFO L87 Difference]: Start difference. First operand 2996 states and 4548 transitions. Second operand has 5 states, 5 states have (on average 54.8) internal successors, (274), 5 states have internal predecessors, (274), 3 states have call successors, (221), 3 states have call predecessors, (221), 3 states have return successors, (220), 3 states have call predecessors, (220), 3 states have call successors, (220) [2021-11-20 23:13:30,763 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 [] [2021-11-20 23:13:32,804 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 [] [2021-11-20 23:13:40,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:40,468 INFO L93 Difference]: Finished difference Result 6805 states and 10352 transitions. [2021-11-20 23:13:40,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:13:40,470 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 54.8) internal successors, (274), 5 states have internal predecessors, (274), 3 states have call successors, (221), 3 states have call predecessors, (221), 3 states have return successors, (220), 3 states have call predecessors, (220), 3 states have call successors, (220) Word has length 930 [2021-11-20 23:13:40,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:40,528 INFO L225 Difference]: With dead ends: 6805 [2021-11-20 23:13:40,528 INFO L226 Difference]: Without dead ends: 4281 [2021-11-20 23:13:40,549 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 930 GetRequests, 926 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:13:40,552 INFO L933 BasicCegarLoop]: 3801 mSDtfsCounter, 2113 mSDsluCounter, 5562 mSDsCounter, 0 mSdLazyCounter, 2455 mSolverCounterSat, 35 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2116 SdHoareTripleChecker+Valid, 9284 SdHoareTripleChecker+Invalid, 2492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 2455 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:40,553 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2116 Valid, 9284 Invalid, 2492 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 2455 Invalid, 2 Unknown, 0 Unchecked, 11.4s Time] [2021-11-20 23:13:40,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4281 states. [2021-11-20 23:13:41,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4281 to 4220. [2021-11-20 23:13:41,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4220 states, 2608 states have (on average 1.2611196319018405) internal successors, (3289), 2670 states have internal predecessors, (3289), 1543 states have call successors, (1543), 63 states have call predecessors, (1543), 68 states have return successors, (1573), 1490 states have call predecessors, (1573), 1542 states have call successors, (1573) [2021-11-20 23:13:41,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4220 states to 4220 states and 6405 transitions. [2021-11-20 23:13:41,193 INFO L78 Accepts]: Start accepts. Automaton has 4220 states and 6405 transitions. Word has length 930 [2021-11-20 23:13:41,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:41,195 INFO L470 AbstractCegarLoop]: Abstraction has 4220 states and 6405 transitions. [2021-11-20 23:13:41,196 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 54.8) internal successors, (274), 5 states have internal predecessors, (274), 3 states have call successors, (221), 3 states have call predecessors, (221), 3 states have return successors, (220), 3 states have call predecessors, (220), 3 states have call successors, (220) [2021-11-20 23:13:41,196 INFO L276 IsEmpty]: Start isEmpty. Operand 4220 states and 6405 transitions. [2021-11-20 23:13:41,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 931 [2021-11-20 23:13:41,214 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:41,215 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] [2021-11-20 23:13:41,258 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:13:41,430 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:13:41,431 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:41,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:41,431 INFO L85 PathProgramCache]: Analyzing trace with hash -1139820250, now seen corresponding path program 1 times [2021-11-20 23:13:41,432 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:41,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1541028384] [2021-11-20 23:13:41,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:41,432 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:41,649 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:13:41,649 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1266031568] [2021-11-20 23:13:41,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:41,650 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:13:41,650 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:13:41,651 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:13:41,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:13:42,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:42,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 3050 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 23:13:42,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:13:44,202 INFO L134 CoverageAnalysis]: Checked inductivity of 43900 backedges. 832 proven. 0 refuted. 0 times theorem prover too weak. 43068 trivial. 0 not checked. [2021-11-20 23:13:44,203 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:13:44,203 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:44,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1541028384] [2021-11-20 23:13:44,203 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:13:44,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1266031568] [2021-11-20 23:13:44,204 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1266031568] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:44,204 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:44,204 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 23:13:44,204 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [614224669] [2021-11-20 23:13:44,205 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:44,206 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:13:44,206 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:44,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:13:44,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:13:44,208 INFO L87 Difference]: Start difference. First operand 4220 states and 6405 transitions. Second operand has 5 states, 5 states have (on average 54.8) internal successors, (274), 5 states have internal predecessors, (274), 3 states have call successors, (221), 3 states have call predecessors, (221), 3 states have return successors, (220), 3 states have call predecessors, (220), 3 states have call successors, (220) [2021-11-20 23:13:46,220 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 [] [2021-11-20 23:13:48,275 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 [] [2021-11-20 23:13:56,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:56,731 INFO L93 Difference]: Finished difference Result 10551 states and 16024 transitions. [2021-11-20 23:13:56,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:13:56,734 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 54.8) internal successors, (274), 5 states have internal predecessors, (274), 3 states have call successors, (221), 3 states have call predecessors, (221), 3 states have return successors, (220), 3 states have call predecessors, (220), 3 states have call successors, (220) Word has length 930 [2021-11-20 23:13:56,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:56,795 INFO L225 Difference]: With dead ends: 10551 [2021-11-20 23:13:56,795 INFO L226 Difference]: Without dead ends: 6906 [2021-11-20 23:13:56,812 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 930 GetRequests, 926 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:13:56,813 INFO L933 BasicCegarLoop]: 4105 mSDtfsCounter, 2067 mSDsluCounter, 8577 mSDsCounter, 0 mSdLazyCounter, 2492 mSolverCounterSat, 4 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2068 SdHoareTripleChecker+Valid, 12583 SdHoareTripleChecker+Invalid, 2498 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 2492 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:56,814 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2068 Valid, 12583 Invalid, 2498 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 2492 Invalid, 2 Unknown, 0 Unchecked, 12.1s Time] [2021-11-20 23:13:56,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6906 states. [2021-11-20 23:13:57,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6906 to 6547. [2021-11-20 23:13:57,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6547 states, 4098 states have (on average 1.2662274280136652) internal successors, (5189), 4173 states have internal predecessors, (5189), 2336 states have call successors, (2336), 102 states have call predecessors, (2336), 112 states have return successors, (2414), 2278 states have call predecessors, (2414), 2334 states have call successors, (2414) [2021-11-20 23:13:58,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6547 states to 6547 states and 9939 transitions. [2021-11-20 23:13:58,035 INFO L78 Accepts]: Start accepts. Automaton has 6547 states and 9939 transitions. Word has length 930 [2021-11-20 23:13:58,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:58,037 INFO L470 AbstractCegarLoop]: Abstraction has 6547 states and 9939 transitions. [2021-11-20 23:13:58,038 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 54.8) internal successors, (274), 5 states have internal predecessors, (274), 3 states have call successors, (221), 3 states have call predecessors, (221), 3 states have return successors, (220), 3 states have call predecessors, (220), 3 states have call successors, (220) [2021-11-20 23:13:58,038 INFO L276 IsEmpty]: Start isEmpty. Operand 6547 states and 9939 transitions. [2021-11-20 23:13:58,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 932 [2021-11-20 23:13:58,116 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:58,118 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] [2021-11-20 23:13:58,159 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:13:58,330 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:13:58,331 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:58,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:58,332 INFO L85 PathProgramCache]: Analyzing trace with hash -317373378, now seen corresponding path program 1 times [2021-11-20 23:13:58,332 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:58,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [838486000] [2021-11-20 23:13:58,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:58,332 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:58,546 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:13:58,546 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [587200426] [2021-11-20 23:13:58,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:58,547 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:13:58,547 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:13:58,548 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:13:58,568 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:13:59,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:59,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 3052 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-20 23:13:59,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:14:01,059 INFO L134 CoverageAnalysis]: Checked inductivity of 43900 backedges. 832 proven. 0 refuted. 0 times theorem prover too weak. 43068 trivial. 0 not checked. [2021-11-20 23:14:01,060 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:14:01,060 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:01,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [838486000] [2021-11-20 23:14:01,060 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:14:01,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [587200426] [2021-11-20 23:14:01,061 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [587200426] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:14:01,061 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:14:01,061 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 23:14:01,061 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961464176] [2021-11-20 23:14:01,062 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:14:01,063 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:14:01,063 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:01,064 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:14:01,064 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:14:01,064 INFO L87 Difference]: Start difference. First operand 6547 states and 9939 transitions. Second operand has 5 states, 5 states have (on average 55.0) internal successors, (275), 5 states have internal predecessors, (275), 3 states have call successors, (221), 3 states have call predecessors, (221), 3 states have return successors, (220), 3 states have call predecessors, (220), 3 states have call successors, (220) [2021-11-20 23:14:03,077 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 [] [2021-11-20 23:14:05,143 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 [] [2021-11-20 23:14:13,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:13,447 INFO L93 Difference]: Finished difference Result 13949 states and 21222 transitions. [2021-11-20 23:14:13,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:14:13,450 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 55.0) internal successors, (275), 5 states have internal predecessors, (275), 3 states have call successors, (221), 3 states have call predecessors, (221), 3 states have return successors, (220), 3 states have call predecessors, (220), 3 states have call successors, (220) Word has length 931 [2021-11-20 23:14:13,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:13,511 INFO L225 Difference]: With dead ends: 13949 [2021-11-20 23:14:13,512 INFO L226 Difference]: Without dead ends: 8304 [2021-11-20 23:14:13,534 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 931 GetRequests, 927 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:14:13,535 INFO L933 BasicCegarLoop]: 3851 mSDtfsCounter, 1792 mSDsluCounter, 6257 mSDsCounter, 0 mSdLazyCounter, 2100 mSolverCounterSat, 11 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1794 SdHoareTripleChecker+Valid, 10033 SdHoareTripleChecker+Invalid, 2113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2100 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:13,535 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1794 Valid, 10033 Invalid, 2113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2100 Invalid, 2 Unknown, 0 Unchecked, 12.0s Time] [2021-11-20 23:14:13,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8304 states. [2021-11-20 23:14:14,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8304 to 7003. [2021-11-20 23:14:14,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7003 states, 4364 states have (on average 1.2660403299725023) internal successors, (5525), 4462 states have internal predecessors, (5525), 2518 states have call successors, (2518), 109 states have call predecessors, (2518), 120 states have return successors, (2616), 2438 states have call predecessors, (2616), 2516 states have call successors, (2616) [2021-11-20 23:14:14,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7003 states to 7003 states and 10659 transitions. [2021-11-20 23:14:14,620 INFO L78 Accepts]: Start accepts. Automaton has 7003 states and 10659 transitions. Word has length 931 [2021-11-20 23:14:14,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:14,621 INFO L470 AbstractCegarLoop]: Abstraction has 7003 states and 10659 transitions. [2021-11-20 23:14:14,622 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 55.0) internal successors, (275), 5 states have internal predecessors, (275), 3 states have call successors, (221), 3 states have call predecessors, (221), 3 states have return successors, (220), 3 states have call predecessors, (220), 3 states have call successors, (220) [2021-11-20 23:14:14,622 INFO L276 IsEmpty]: Start isEmpty. Operand 7003 states and 10659 transitions. [2021-11-20 23:14:14,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 935 [2021-11-20 23:14:14,642 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:14,643 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] [2021-11-20 23:14:14,689 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:14:14,858 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:14,859 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:14,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:14,860 INFO L85 PathProgramCache]: Analyzing trace with hash 352201073, now seen corresponding path program 1 times [2021-11-20 23:14:14,860 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:14,860 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1288674793] [2021-11-20 23:14:14,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:14,860 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:15,054 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:14:15,055 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [104274169] [2021-11-20 23:14:15,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:15,055 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:15,055 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:14:15,056 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:14:15,073 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:14:15,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:15,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 3061 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 23:14:15,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:14:17,601 INFO L134 CoverageAnalysis]: Checked inductivity of 43900 backedges. 832 proven. 0 refuted. 0 times theorem prover too weak. 43068 trivial. 0 not checked. [2021-11-20 23:14:17,602 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:14:17,602 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:17,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1288674793] [2021-11-20 23:14:17,602 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:14:17,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [104274169] [2021-11-20 23:14:17,602 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [104274169] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:14:17,603 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:14:17,603 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 23:14:17,603 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883169449] [2021-11-20 23:14:17,603 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:14:17,605 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:14:17,605 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:17,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:14:17,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:14:17,606 INFO L87 Difference]: Start difference. First operand 7003 states and 10659 transitions. Second operand has 5 states, 5 states have (on average 55.2) internal successors, (276), 5 states have internal predecessors, (276), 3 states have call successors, (222), 3 states have call predecessors, (222), 3 states have return successors, (221), 3 states have call predecessors, (221), 3 states have call successors, (221) [2021-11-20 23:14:19,619 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 [] [2021-11-20 23:14:21,675 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 [] [2021-11-20 23:14:33,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:33,295 INFO L93 Difference]: Finished difference Result 12258 states and 18720 transitions. [2021-11-20 23:14:33,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:14:33,299 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 55.2) internal successors, (276), 5 states have internal predecessors, (276), 3 states have call successors, (222), 3 states have call predecessors, (222), 3 states have return successors, (221), 3 states have call predecessors, (221), 3 states have call successors, (221) Word has length 934 [2021-11-20 23:14:33,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:33,334 INFO L225 Difference]: With dead ends: 12258 [2021-11-20 23:14:33,334 INFO L226 Difference]: Without dead ends: 6103 [2021-11-20 23:14:33,361 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 934 GetRequests, 930 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:14:33,361 INFO L933 BasicCegarLoop]: 3101 mSDtfsCounter, 1818 mSDsluCounter, 4514 mSDsCounter, 0 mSdLazyCounter, 2090 mSolverCounterSat, 27 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1819 SdHoareTripleChecker+Valid, 7553 SdHoareTripleChecker+Invalid, 2119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 2090 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:33,362 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1819 Valid, 7553 Invalid, 2119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 2090 Invalid, 2 Unknown, 0 Unchecked, 15.4s Time] [2021-11-20 23:14:33,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6103 states. [2021-11-20 23:14:34,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6103 to 5802. [2021-11-20 23:14:34,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5802 states, 3633 states have (on average 1.2546105147261217) internal successors, (4558), 3655 states have internal predecessors, (4558), 2069 states have call successors, (2069), 92 states have call predecessors, (2069), 99 states have return successors, (2141), 2059 states have call predecessors, (2141), 2067 states have call successors, (2141) [2021-11-20 23:14:34,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5802 states to 5802 states and 8768 transitions. [2021-11-20 23:14:34,378 INFO L78 Accepts]: Start accepts. Automaton has 5802 states and 8768 transitions. Word has length 934 [2021-11-20 23:14:34,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:34,380 INFO L470 AbstractCegarLoop]: Abstraction has 5802 states and 8768 transitions. [2021-11-20 23:14:34,381 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 55.2) internal successors, (276), 5 states have internal predecessors, (276), 3 states have call successors, (222), 3 states have call predecessors, (222), 3 states have return successors, (221), 3 states have call predecessors, (221), 3 states have call successors, (221) [2021-11-20 23:14:34,381 INFO L276 IsEmpty]: Start isEmpty. Operand 5802 states and 8768 transitions. [2021-11-20 23:14:34,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 935 [2021-11-20 23:14:34,411 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:34,411 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] [2021-11-20 23:14:34,455 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 23:14:34,626 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:34,627 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:34,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:34,628 INFO L85 PathProgramCache]: Analyzing trace with hash -1802357302, now seen corresponding path program 1 times [2021-11-20 23:14:34,628 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:34,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1548758537] [2021-11-20 23:14:34,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:34,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:34,834 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:14:34,834 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [526598755] [2021-11-20 23:14:34,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:34,835 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:34,835 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:14:34,836 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:14:34,858 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:14:35,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:35,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 3060 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-20 23:14:35,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:14:37,176 INFO L134 CoverageAnalysis]: Checked inductivity of 43902 backedges. 836 proven. 0 refuted. 0 times theorem prover too weak. 43066 trivial. 0 not checked. [2021-11-20 23:14:37,177 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:14:37,177 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:37,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1548758537] [2021-11-20 23:14:37,177 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:14:37,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [526598755] [2021-11-20 23:14:37,178 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [526598755] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:14:37,178 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:14:37,178 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 23:14:37,178 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558768303] [2021-11-20 23:14:37,178 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:14:37,180 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:14:37,180 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:37,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:14:37,180 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:14:37,181 INFO L87 Difference]: Start difference. First operand 5802 states and 8768 transitions. Second operand has 5 states, 5 states have (on average 55.8) internal successors, (279), 5 states have internal predecessors, (279), 3 states have call successors, (222), 3 states have call predecessors, (222), 3 states have return successors, (221), 3 states have call predecessors, (221), 3 states have call successors, (221) [2021-11-20 23:14:39,198 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 [] [2021-11-20 23:14:41,254 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 [] [2021-11-20 23:14:49,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:49,479 INFO L93 Difference]: Finished difference Result 10180 states and 15531 transitions. [2021-11-20 23:14:49,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:14:49,483 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 55.8) internal successors, (279), 5 states have internal predecessors, (279), 3 states have call successors, (222), 3 states have call predecessors, (222), 3 states have return successors, (221), 3 states have call predecessors, (221), 3 states have call successors, (221) Word has length 934 [2021-11-20 23:14:49,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:49,510 INFO L225 Difference]: With dead ends: 10180 [2021-11-20 23:14:49,510 INFO L226 Difference]: Without dead ends: 5806 [2021-11-20 23:14:49,528 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 934 GetRequests, 930 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:14:49,528 INFO L933 BasicCegarLoop]: 3243 mSDtfsCounter, 1447 mSDsluCounter, 5042 mSDsCounter, 0 mSdLazyCounter, 1699 mSolverCounterSat, 32 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1450 SdHoareTripleChecker+Valid, 8223 SdHoareTripleChecker+Invalid, 1733 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 1699 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.9s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:49,529 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1450 Valid, 8223 Invalid, 1733 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 1699 Invalid, 2 Unknown, 0 Unchecked, 11.9s Time] [2021-11-20 23:14:49,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5806 states. [2021-11-20 23:14:50,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5806 to 5802. [2021-11-20 23:14:50,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5802 states, 3633 states have (on average 1.2535094962840627) internal successors, (4554), 3655 states have internal predecessors, (4554), 2069 states have call successors, (2069), 92 states have call predecessors, (2069), 99 states have return successors, (2141), 2059 states have call predecessors, (2141), 2067 states have call successors, (2141) [2021-11-20 23:14:50,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5802 states to 5802 states and 8764 transitions. [2021-11-20 23:14:50,345 INFO L78 Accepts]: Start accepts. Automaton has 5802 states and 8764 transitions. Word has length 934 [2021-11-20 23:14:50,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:50,346 INFO L470 AbstractCegarLoop]: Abstraction has 5802 states and 8764 transitions. [2021-11-20 23:14:50,347 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 55.8) internal successors, (279), 5 states have internal predecessors, (279), 3 states have call successors, (222), 3 states have call predecessors, (222), 3 states have return successors, (221), 3 states have call predecessors, (221), 3 states have call successors, (221) [2021-11-20 23:14:50,347 INFO L276 IsEmpty]: Start isEmpty. Operand 5802 states and 8764 transitions. [2021-11-20 23:14:50,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 935 [2021-11-20 23:14:50,367 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:50,368 INFO L514 BasicCegarLoop]: trace histogram [210, 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] [2021-11-20 23:14:50,410 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 23:14:50,594 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:50,594 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:50,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:50,595 INFO L85 PathProgramCache]: Analyzing trace with hash 979840266, now seen corresponding path program 1 times [2021-11-20 23:14:50,595 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:50,595 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [408899531] [2021-11-20 23:14:50,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:50,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:50,787 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:14:50,787 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1200173782] [2021-11-20 23:14:50,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:50,788 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:50,788 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:14:50,789 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:14:50,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 23:14:51,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:51,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 3062 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 23:14:51,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:14:53,311 INFO L134 CoverageAnalysis]: Checked inductivity of 43904 backedges. 834 proven. 0 refuted. 0 times theorem prover too weak. 43070 trivial. 0 not checked. [2021-11-20 23:14:53,312 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:14:53,312 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:53,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [408899531] [2021-11-20 23:14:53,312 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:14:53,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1200173782] [2021-11-20 23:14:53,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1200173782] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:14:53,312 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:14:53,313 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 23:14:53,313 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [301617476] [2021-11-20 23:14:53,313 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:14:53,314 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:14:53,314 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:53,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:14:53,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:14:53,315 INFO L87 Difference]: Start difference. First operand 5802 states and 8764 transitions. Second operand has 5 states, 5 states have (on average 55.0) internal successors, (275), 5 states have internal predecessors, (275), 3 states have call successors, (222), 3 states have call predecessors, (222), 3 states have return successors, (221), 3 states have call predecessors, (221), 3 states have call successors, (221) [2021-11-20 23:14:55,326 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 [] [2021-11-20 23:14:57,384 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 [] [2021-11-20 23:15:03,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:15:03,046 INFO L93 Difference]: Finished difference Result 10763 states and 16257 transitions. [2021-11-20 23:15:03,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:15:03,047 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 55.0) internal successors, (275), 5 states have internal predecessors, (275), 3 states have call successors, (222), 3 states have call predecessors, (222), 3 states have return successors, (221), 3 states have call predecessors, (221), 3 states have call successors, (221) Word has length 934 [2021-11-20 23:15:03,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:15:03,080 INFO L225 Difference]: With dead ends: 10763 [2021-11-20 23:15:03,080 INFO L226 Difference]: Without dead ends: 5983 [2021-11-20 23:15:03,097 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 934 GetRequests, 930 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:15:03,098 INFO L933 BasicCegarLoop]: 3098 mSDtfsCounter, 761 mSDsluCounter, 5690 mSDsCounter, 0 mSdLazyCounter, 913 mSolverCounterSat, 3 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 762 SdHoareTripleChecker+Valid, 8715 SdHoareTripleChecker+Invalid, 918 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 913 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:15:03,098 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [762 Valid, 8715 Invalid, 918 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 913 Invalid, 2 Unknown, 0 Unchecked, 9.5s Time] [2021-11-20 23:15:03,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5983 states. [2021-11-20 23:15:03,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5983 to 5962. [2021-11-20 23:15:03,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5962 states, 3742 states have (on average 1.2541421699625868) internal successors, (4693), 3766 states have internal predecessors, (4693), 2113 states have call successors, (2113), 98 states have call predecessors, (2113), 106 states have return successors, (2186), 2102 states have call predecessors, (2186), 2111 states have call successors, (2186) [2021-11-20 23:15:03,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5962 states to 5962 states and 8992 transitions. [2021-11-20 23:15:03,887 INFO L78 Accepts]: Start accepts. Automaton has 5962 states and 8992 transitions. Word has length 934 [2021-11-20 23:15:03,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:15:03,888 INFO L470 AbstractCegarLoop]: Abstraction has 5962 states and 8992 transitions. [2021-11-20 23:15:03,889 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 55.0) internal successors, (275), 5 states have internal predecessors, (275), 3 states have call successors, (222), 3 states have call predecessors, (222), 3 states have return successors, (221), 3 states have call predecessors, (221), 3 states have call successors, (221) [2021-11-20 23:15:03,889 INFO L276 IsEmpty]: Start isEmpty. Operand 5962 states and 8992 transitions. [2021-11-20 23:15:03,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 937 [2021-11-20 23:15:03,909 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:15:03,910 INFO L514 BasicCegarLoop]: trace histogram [210, 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] [2021-11-20 23:15:03,952 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 23:15:04,126 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:15:04,126 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:15:04,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:15:04,127 INFO L85 PathProgramCache]: Analyzing trace with hash -861020947, now seen corresponding path program 1 times [2021-11-20 23:15:04,127 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:15:04,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [760903154] [2021-11-20 23:15:04,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:15:04,127 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:15:04,337 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:15:04,337 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1870494507] [2021-11-20 23:15:04,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:15:04,338 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:15:04,338 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:15:04,339 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:15:04,358 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 23:15:05,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:15:05,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 3066 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-20 23:15:05,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:15:06,830 INFO L134 CoverageAnalysis]: Checked inductivity of 43904 backedges. 835 proven. 0 refuted. 0 times theorem prover too weak. 43069 trivial. 0 not checked. [2021-11-20 23:15:06,830 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:15:06,831 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:15:06,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [760903154] [2021-11-20 23:15:06,831 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:15:06,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1870494507] [2021-11-20 23:15:06,831 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1870494507] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:15:06,831 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:15:06,832 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 23:15:06,832 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059416800] [2021-11-20 23:15:06,832 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:15:06,834 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:15:06,834 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:15:06,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:15:06,835 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:15:06,835 INFO L87 Difference]: Start difference. First operand 5962 states and 8992 transitions. Second operand has 5 states, 5 states have (on average 55.6) internal successors, (278), 5 states have internal predecessors, (278), 3 states have call successors, (222), 3 states have call predecessors, (222), 3 states have return successors, (221), 3 states have call predecessors, (221), 3 states have call successors, (221) [2021-11-20 23:15:08,848 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 [] [2021-11-20 23:15:10,901 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 [] [2021-11-20 23:15:28,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:15:28,373 INFO L93 Difference]: Finished difference Result 10667 states and 16150 transitions. [2021-11-20 23:15:28,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:15:28,379 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 55.6) internal successors, (278), 5 states have internal predecessors, (278), 3 states have call successors, (222), 3 states have call predecessors, (222), 3 states have return successors, (221), 3 states have call predecessors, (221), 3 states have call successors, (221) Word has length 936 [2021-11-20 23:15:28,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:15:28,414 INFO L225 Difference]: With dead ends: 10667 [2021-11-20 23:15:28,414 INFO L226 Difference]: Without dead ends: 5996 [2021-11-20 23:15:28,434 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 936 GetRequests, 932 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:15:28,435 INFO L933 BasicCegarLoop]: 3705 mSDtfsCounter, 1769 mSDsluCounter, 6114 mSDsCounter, 0 mSdLazyCounter, 2077 mSolverCounterSat, 6 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1771 SdHoareTripleChecker+Valid, 9744 SdHoareTripleChecker+Invalid, 2085 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 2077 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:15:28,437 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1771 Valid, 9744 Invalid, 2085 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 2077 Invalid, 2 Unknown, 0 Unchecked, 21.2s Time] [2021-11-20 23:15:28,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5996 states. [2021-11-20 23:15:29,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5996 to 5946. [2021-11-20 23:15:29,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5946 states, 3732 states have (on average 1.2532154340836013) internal successors, (4677), 3756 states have internal predecessors, (4677), 2109 states have call successors, (2109), 96 states have call predecessors, (2109), 104 states have return successors, (2182), 2098 states have call predecessors, (2182), 2107 states have call successors, (2182) [2021-11-20 23:15:29,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5946 states to 5946 states and 8968 transitions. [2021-11-20 23:15:29,398 INFO L78 Accepts]: Start accepts. Automaton has 5946 states and 8968 transitions. Word has length 936 [2021-11-20 23:15:29,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:15:29,399 INFO L470 AbstractCegarLoop]: Abstraction has 5946 states and 8968 transitions. [2021-11-20 23:15:29,400 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 55.6) internal successors, (278), 5 states have internal predecessors, (278), 3 states have call successors, (222), 3 states have call predecessors, (222), 3 states have return successors, (221), 3 states have call predecessors, (221), 3 states have call successors, (221) [2021-11-20 23:15:29,400 INFO L276 IsEmpty]: Start isEmpty. Operand 5946 states and 8968 transitions. [2021-11-20 23:15:29,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 943 [2021-11-20 23:15:29,420 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:15:29,421 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] [2021-11-20 23:15:29,466 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 23:15:29,640 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-20 23:15:29,641 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:15:29,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:15:29,641 INFO L85 PathProgramCache]: Analyzing trace with hash -1680952972, now seen corresponding path program 1 times [2021-11-20 23:15:29,641 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:15:29,641 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31401747] [2021-11-20 23:15:29,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:15:29,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:15:29,816 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:15:29,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1759998120] [2021-11-20 23:15:29,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:15:29,817 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:15:29,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:15:29,818 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:15:29,838 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 23:15:30,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:15:30,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 3084 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 23:15:30,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:15:32,422 INFO L134 CoverageAnalysis]: Checked inductivity of 43906 backedges. 834 proven. 0 refuted. 0 times theorem prover too weak. 43072 trivial. 0 not checked. [2021-11-20 23:15:32,422 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:15:32,422 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:15:32,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31401747] [2021-11-20 23:15:32,423 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:15:32,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1759998120] [2021-11-20 23:15:32,423 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1759998120] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:15:32,423 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:15:32,424 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 23:15:32,425 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381811621] [2021-11-20 23:15:32,425 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:15:32,427 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:15:32,427 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:15:32,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:15:32,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:15:32,428 INFO L87 Difference]: Start difference. First operand 5946 states and 8968 transitions. Second operand has 5 states, 5 states have (on average 55.8) internal successors, (279), 5 states have internal predecessors, (279), 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) [2021-11-20 23:15:34,441 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 [] [2021-11-20 23:15:36,524 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 [] [2021-11-20 23:15:54,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:15:54,060 INFO L93 Difference]: Finished difference Result 10434 states and 15863 transitions. [2021-11-20 23:15:54,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:15:54,065 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 55.8) internal successors, (279), 5 states have internal predecessors, (279), 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 942 [2021-11-20 23:15:54,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:15:54,089 INFO L225 Difference]: With dead ends: 10434 [2021-11-20 23:15:54,089 INFO L226 Difference]: Without dead ends: 5613 [2021-11-20 23:15:54,102 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 942 GetRequests, 938 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:15:54,103 INFO L933 BasicCegarLoop]: 3097 mSDtfsCounter, 1803 mSDsluCounter, 4500 mSDsCounter, 0 mSdLazyCounter, 2084 mSolverCounterSat, 26 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1804 SdHoareTripleChecker+Valid, 7535 SdHoareTripleChecker+Invalid, 2112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 2084 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:15:54,104 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1804 Valid, 7535 Invalid, 2112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 2084 Invalid, 2 Unknown, 0 Unchecked, 21.3s Time] [2021-11-20 23:15:54,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5613 states. [2021-11-20 23:15:54,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5613 to 5592. [2021-11-20 23:15:54,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5592 states, 3471 states have (on average 1.2445980985306828) internal successors, (4320), 3495 states have internal predecessors, (4320), 2019 states have call successors, (2019), 93 states have call predecessors, (2019), 101 states have return successors, (2092), 2008 states have call predecessors, (2092), 2017 states have call successors, (2092) [2021-11-20 23:15:54,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5592 states to 5592 states and 8431 transitions. [2021-11-20 23:15:54,730 INFO L78 Accepts]: Start accepts. Automaton has 5592 states and 8431 transitions. Word has length 942 [2021-11-20 23:15:54,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:15:54,732 INFO L470 AbstractCegarLoop]: Abstraction has 5592 states and 8431 transitions. [2021-11-20 23:15:54,732 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 55.8) internal successors, (279), 5 states have internal predecessors, (279), 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) [2021-11-20 23:15:54,732 INFO L276 IsEmpty]: Start isEmpty. Operand 5592 states and 8431 transitions. [2021-11-20 23:15:54,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 943 [2021-11-20 23:15:54,752 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:15:54,752 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] [2021-11-20 23:15:54,785 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-20 23:15:54,965 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-20 23:15:54,966 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:15:54,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:15:54,967 INFO L85 PathProgramCache]: Analyzing trace with hash -921522494, now seen corresponding path program 1 times [2021-11-20 23:15:54,967 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:15:54,967 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [137904495] [2021-11-20 23:15:54,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:15:54,967 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:15:55,186 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:15:55,186 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1864982403] [2021-11-20 23:15:55,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:15:55,187 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:15:55,187 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:15:55,188 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:15:55,208 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80151831-5f9d-407c-836c-1d607ed1e061/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-20 23:15:56,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:15:56,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 3082 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-20 23:15:56,116 INFO L286 TraceCheckSpWp]: Computing forward predicates...