./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem03_label45.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/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_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem03_label45.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/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_1a8026eb-dd78-4270-98ca-fbe0c9058626/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 e46cda06cd6f3e72cb5a00e680e37793de7d3fd440c55f6638f7eefc5d4b52af --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:14:44,513 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:14:44,515 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:14:44,581 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:14:44,582 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:14:44,587 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:14:44,588 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:14:44,593 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:14:44,595 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:14:44,601 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:14:44,602 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:14:44,604 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:14:44,604 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:14:44,607 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:14:44,609 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:14:44,614 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:14:44,615 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:14:44,617 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:14:44,619 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:14:44,627 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:14:44,629 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:14:44,630 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:14:44,633 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:14:44,634 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:14:44,638 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:14:44,639 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:14:44,639 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:14:44,641 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:14:44,641 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:14:44,643 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:14:44,644 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:14:44,645 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:14:44,647 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:14:44,648 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:14:44,650 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:14:44,650 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:14:44,651 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:14:44,651 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:14:44,651 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:14:44,652 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:14:44,653 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:14:44,654 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:14:44,702 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:14:44,705 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:14:44,711 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:14:44,712 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:14:44,712 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:14:44,713 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:14:44,713 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:14:44,713 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:14:44,714 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:14:44,714 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:14:44,715 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:14:44,715 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:14:44,716 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:14:44,716 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:14:44,716 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:14:44,716 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:14:44,716 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:14:44,717 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:14:44,718 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:14:44,718 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:14:44,719 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:14:44,719 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:14:44,719 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:14:44,719 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:14:44,719 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:14:44,720 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:14:44,721 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:14:44,722 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:14:44,722 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:14:44,722 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:14:44,722 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:14:44,723 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:14:44,723 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:14:44,723 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:14:44,723 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:14:44,724 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:14:44,724 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:14:44,724 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:14:44,724 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:14:44,725 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:14:44,725 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:14:44,725 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_1a8026eb-dd78-4270-98ca-fbe0c9058626/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e46cda06cd6f3e72cb5a00e680e37793de7d3fd440c55f6638f7eefc5d4b52af [2021-11-20 23:14:45,025 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:14:45,054 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:14:45,057 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:14:45,058 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:14:45,059 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:14:45,060 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/eca-rers2012/Problem03_label45.c [2021-11-20 23:14:45,144 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/data/45f72a5c0/f2c93c8d7e314847a08f2ce5d9b7e12a/FLAG5f3ec72dd [2021-11-20 23:14:45,822 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:14:45,823 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/sv-benchmarks/c/eca-rers2012/Problem03_label45.c [2021-11-20 23:14:45,839 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/data/45f72a5c0/f2c93c8d7e314847a08f2ce5d9b7e12a/FLAG5f3ec72dd [2021-11-20 23:14:46,018 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/data/45f72a5c0/f2c93c8d7e314847a08f2ce5d9b7e12a [2021-11-20 23:14:46,021 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:14:46,023 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:14:46,027 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:14:46,028 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:14:46,031 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:14:46,032 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:14:46" (1/1) ... [2021-11-20 23:14:46,033 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@30f08c4d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:46, skipping insertion in model container [2021-11-20 23:14:46,034 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:14:46" (1/1) ... [2021-11-20 23:14:46,042 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:14:46,129 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:14:46,791 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_1a8026eb-dd78-4270-98ca-fbe0c9058626/sv-benchmarks/c/eca-rers2012/Problem03_label45.c[53653,53666] [2021-11-20 23:14:46,885 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:14:46,892 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:14:47,129 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_1a8026eb-dd78-4270-98ca-fbe0c9058626/sv-benchmarks/c/eca-rers2012/Problem03_label45.c[53653,53666] [2021-11-20 23:14:47,149 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:14:47,166 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:14:47,166 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:47 WrapperNode [2021-11-20 23:14:47,167 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:14:47,168 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:14:47,168 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:14:47,168 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:14:47,176 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:47" (1/1) ... [2021-11-20 23:14:47,206 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:47" (1/1) ... [2021-11-20 23:14:47,364 INFO L137 Inliner]: procedures = 14, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 1771 [2021-11-20 23:14:47,364 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:14:47,366 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:14:47,366 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:14:47,366 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:14:47,388 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:47" (1/1) ... [2021-11-20 23:14:47,389 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:47" (1/1) ... [2021-11-20 23:14:47,403 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:47" (1/1) ... [2021-11-20 23:14:47,403 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:47" (1/1) ... [2021-11-20 23:14:47,458 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:47" (1/1) ... [2021-11-20 23:14:47,492 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:47" (1/1) ... [2021-11-20 23:14:47,504 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:47" (1/1) ... [2021-11-20 23:14:47,515 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:14:47,555 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:14:47,555 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:14:47,555 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:14:47,556 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:47" (1/1) ... [2021-11-20 23:14:47,562 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:14:47,573 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:14:47,587 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:14:47,617 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:14:47,631 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:14:47,631 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:14:47,631 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:14:47,631 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:14:47,706 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:14:47,707 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:14:49,344 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:14:49,626 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:14:49,626 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-20 23:14:49,629 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:14:49 BoogieIcfgContainer [2021-11-20 23:14:49,629 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:14:49,631 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:14:49,631 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:14:49,634 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:14:49,635 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:14:46" (1/3) ... [2021-11-20 23:14:49,636 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68da37a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:14:49, skipping insertion in model container [2021-11-20 23:14:49,636 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:14:47" (2/3) ... [2021-11-20 23:14:49,636 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68da37a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:14:49, skipping insertion in model container [2021-11-20 23:14:49,636 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:14:49" (3/3) ... [2021-11-20 23:14:49,638 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem03_label45.c [2021-11-20 23:14:49,643 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:14:49,643 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 23:14:49,692 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:14:49,699 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 23:14:49,699 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 23:14:49,718 INFO L276 IsEmpty]: Start isEmpty. Operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:49,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-20 23:14:49,731 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:49,731 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:14:49,732 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:49,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:49,737 INFO L85 PathProgramCache]: Analyzing trace with hash -1725563226, now seen corresponding path program 1 times [2021-11-20 23:14:49,747 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:49,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [79447852] [2021-11-20 23:14:49,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:49,749 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:50,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:50,338 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:14:50,338 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:50,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [79447852] [2021-11-20 23:14:50,339 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [79447852] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:14:50,339 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:14:50,340 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:14:50,341 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549775752] [2021-11-20 23:14:50,342 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:14:50,346 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:14:50,347 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:50,372 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:14:50,372 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:14:50,375 INFO L87 Difference]: Start difference. First operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:51,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:51,306 INFO L93 Difference]: Finished difference Result 440 states and 860 transitions. [2021-11-20 23:14:51,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:14:51,309 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 143 [2021-11-20 23:14:51,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:51,323 INFO L225 Difference]: With dead ends: 440 [2021-11-20 23:14:51,323 INFO L226 Difference]: Without dead ends: 289 [2021-11-20 23:14:51,327 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:14:51,331 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 10 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 471 mSolverCounterSat, 149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 620 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 149 IncrementalHoareTripleChecker+Valid, 471 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:51,332 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 30 Invalid, 620 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [149 Valid, 471 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 23:14:51,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-11-20 23:14:51,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2021-11-20 23:14:51,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 288 states have (on average 1.8923611111111112) internal successors, (545), 288 states have internal predecessors, (545), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:51,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 545 transitions. [2021-11-20 23:14:51,392 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 545 transitions. Word has length 143 [2021-11-20 23:14:51,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:51,394 INFO L470 AbstractCegarLoop]: Abstraction has 289 states and 545 transitions. [2021-11-20 23:14:51,394 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:51,394 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 545 transitions. [2021-11-20 23:14:51,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-20 23:14:51,398 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:51,398 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:14:51,399 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:14:51,399 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:51,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:51,400 INFO L85 PathProgramCache]: Analyzing trace with hash 1066966282, now seen corresponding path program 1 times [2021-11-20 23:14:51,400 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:51,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [117304099] [2021-11-20 23:14:51,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:51,401 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:51,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:51,595 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:14:51,598 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:51,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [117304099] [2021-11-20 23:14:51,599 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [117304099] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:14:51,599 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:14:51,601 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:14:51,601 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [101569383] [2021-11-20 23:14:51,601 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:14:51,603 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:14:51,605 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:51,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:14:51,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:14:51,606 INFO L87 Difference]: Start difference. First operand 289 states and 545 transitions. Second operand has 3 states, 3 states have (on average 49.666666666666664) internal successors, (149), 2 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:52,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:52,437 INFO L93 Difference]: Finished difference Result 863 states and 1632 transitions. [2021-11-20 23:14:52,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:14:52,442 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 49.666666666666664) internal successors, (149), 2 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 149 [2021-11-20 23:14:52,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:52,447 INFO L225 Difference]: With dead ends: 863 [2021-11-20 23:14:52,447 INFO L226 Difference]: Without dead ends: 575 [2021-11-20 23:14:52,449 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:14:52,451 INFO L933 BasicCegarLoop]: 92 mSDtfsCounter, 152 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 451 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 574 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 451 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:52,451 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [152 Valid, 95 Invalid, 574 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 451 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 23:14:52,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2021-11-20 23:14:52,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 575. [2021-11-20 23:14:52,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 574 states have (on average 1.5609756097560976) internal successors, (896), 574 states have internal predecessors, (896), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:52,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 896 transitions. [2021-11-20 23:14:52,488 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 896 transitions. Word has length 149 [2021-11-20 23:14:52,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:52,489 INFO L470 AbstractCegarLoop]: Abstraction has 575 states and 896 transitions. [2021-11-20 23:14:52,489 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 49.666666666666664) internal successors, (149), 2 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:52,489 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 896 transitions. [2021-11-20 23:14:52,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-11-20 23:14:52,495 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:52,495 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:14:52,496 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-20 23:14:52,496 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:52,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:52,497 INFO L85 PathProgramCache]: Analyzing trace with hash -954525509, now seen corresponding path program 1 times [2021-11-20 23:14:52,497 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:52,497 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1398303299] [2021-11-20 23:14:52,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:52,498 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:52,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:52,578 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:14:52,578 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:52,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1398303299] [2021-11-20 23:14:52,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1398303299] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:14:52,579 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:14:52,579 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:14:52,580 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166689921] [2021-11-20 23:14:52,580 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:14:52,581 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:14:52,581 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:52,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:14:52,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:14:52,582 INFO L87 Difference]: Start difference. First operand 575 states and 896 transitions. Second operand has 3 states, 3 states have (on average 51.666666666666664) internal successors, (155), 2 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:53,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:53,336 INFO L93 Difference]: Finished difference Result 1723 states and 2686 transitions. [2021-11-20 23:14:53,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:14:53,337 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 51.666666666666664) internal successors, (155), 2 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 155 [2021-11-20 23:14:53,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:53,344 INFO L225 Difference]: With dead ends: 1723 [2021-11-20 23:14:53,344 INFO L226 Difference]: Without dead ends: 1149 [2021-11-20 23:14:53,348 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:14:53,350 INFO L933 BasicCegarLoop]: 101 mSDtfsCounter, 183 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 611 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 632 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 611 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:53,350 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [183 Valid, 105 Invalid, 632 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 611 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 23:14:53,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1149 states. [2021-11-20 23:14:53,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1149 to 1147. [2021-11-20 23:14:53,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1147 states, 1146 states have (on average 1.5383944153577662) internal successors, (1763), 1146 states have internal predecessors, (1763), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:53,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1147 states to 1147 states and 1763 transitions. [2021-11-20 23:14:53,397 INFO L78 Accepts]: Start accepts. Automaton has 1147 states and 1763 transitions. Word has length 155 [2021-11-20 23:14:53,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:53,402 INFO L470 AbstractCegarLoop]: Abstraction has 1147 states and 1763 transitions. [2021-11-20 23:14:53,402 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 51.666666666666664) internal successors, (155), 2 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:53,402 INFO L276 IsEmpty]: Start isEmpty. Operand 1147 states and 1763 transitions. [2021-11-20 23:14:53,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-11-20 23:14:53,409 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:53,409 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:14:53,409 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-20 23:14:53,409 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:53,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:53,410 INFO L85 PathProgramCache]: Analyzing trace with hash 1007943017, now seen corresponding path program 1 times [2021-11-20 23:14:53,411 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:53,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1407772778] [2021-11-20 23:14:53,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:53,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:53,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:53,516 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 23:14:53,516 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:53,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1407772778] [2021-11-20 23:14:53,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1407772778] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:14:53,517 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:14:53,517 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:14:53,517 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063260255] [2021-11-20 23:14:53,517 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:14:53,518 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:14:53,518 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:53,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:14:53,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:14:53,519 INFO L87 Difference]: Start difference. First operand 1147 states and 1763 transitions. Second operand has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:54,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:54,302 INFO L93 Difference]: Finished difference Result 3437 states and 5286 transitions. [2021-11-20 23:14:54,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:14:54,303 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 157 [2021-11-20 23:14:54,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:54,317 INFO L225 Difference]: With dead ends: 3437 [2021-11-20 23:14:54,318 INFO L226 Difference]: Without dead ends: 2291 [2021-11-20 23:14:54,321 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:14:54,323 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 157 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 452 mSolverCounterSat, 170 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 157 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 622 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 170 IncrementalHoareTripleChecker+Valid, 452 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:54,323 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [157 Valid, 25 Invalid, 622 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [170 Valid, 452 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 23:14:54,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2291 states. [2021-11-20 23:14:54,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2291 to 2291. [2021-11-20 23:14:54,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2291 states, 2290 states have (on average 1.502183406113537) internal successors, (3440), 2290 states have internal predecessors, (3440), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:54,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2291 states to 2291 states and 3440 transitions. [2021-11-20 23:14:54,420 INFO L78 Accepts]: Start accepts. Automaton has 2291 states and 3440 transitions. Word has length 157 [2021-11-20 23:14:54,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:54,420 INFO L470 AbstractCegarLoop]: Abstraction has 2291 states and 3440 transitions. [2021-11-20 23:14:54,421 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:54,421 INFO L276 IsEmpty]: Start isEmpty. Operand 2291 states and 3440 transitions. [2021-11-20 23:14:54,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2021-11-20 23:14:54,427 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:54,427 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:14:54,428 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-20 23:14:54,428 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:54,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:54,431 INFO L85 PathProgramCache]: Analyzing trace with hash -513437, now seen corresponding path program 1 times [2021-11-20 23:14:54,431 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:54,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2037541762] [2021-11-20 23:14:54,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:54,432 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:54,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:54,537 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 50 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-20 23:14:54,538 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:54,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2037541762] [2021-11-20 23:14:54,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2037541762] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:14:54,538 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:14:54,538 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:14:54,539 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130683489] [2021-11-20 23:14:54,542 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:14:54,542 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:14:54,543 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:54,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:14:54,544 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:14:54,544 INFO L87 Difference]: Start difference. First operand 2291 states and 3440 transitions. Second operand has 3 states, 3 states have (on average 53.333333333333336) internal successors, (160), 3 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:55,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:55,320 INFO L93 Difference]: Finished difference Result 5725 states and 8951 transitions. [2021-11-20 23:14:55,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:14:55,320 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 53.333333333333336) internal successors, (160), 3 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 171 [2021-11-20 23:14:55,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:55,341 INFO L225 Difference]: With dead ends: 5725 [2021-11-20 23:14:55,341 INFO L226 Difference]: Without dead ends: 3435 [2021-11-20 23:14:55,345 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 23:14:55,355 INFO L933 BasicCegarLoop]: 257 mSDtfsCounter, 150 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 407 mSolverCounterSat, 162 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 569 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 162 IncrementalHoareTripleChecker+Valid, 407 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:55,356 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [150 Valid, 261 Invalid, 569 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [162 Valid, 407 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 23:14:55,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3435 states. [2021-11-20 23:14:55,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3435 to 3435. [2021-11-20 23:14:55,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3435 states, 3434 states have (on average 1.4181712288875947) internal successors, (4870), 3434 states have internal predecessors, (4870), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:55,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3435 states to 3435 states and 4870 transitions. [2021-11-20 23:14:55,481 INFO L78 Accepts]: Start accepts. Automaton has 3435 states and 4870 transitions. Word has length 171 [2021-11-20 23:14:55,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:55,482 INFO L470 AbstractCegarLoop]: Abstraction has 3435 states and 4870 transitions. [2021-11-20 23:14:55,482 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 53.333333333333336) internal successors, (160), 3 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:55,483 INFO L276 IsEmpty]: Start isEmpty. Operand 3435 states and 4870 transitions. [2021-11-20 23:14:55,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-11-20 23:14:55,496 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:55,496 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:14:55,496 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-20 23:14:55,497 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:55,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:55,499 INFO L85 PathProgramCache]: Analyzing trace with hash 574302187, now seen corresponding path program 1 times [2021-11-20 23:14:55,499 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:55,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1966883665] [2021-11-20 23:14:55,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:55,500 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:55,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:55,599 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 23:14:55,600 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:55,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1966883665] [2021-11-20 23:14:55,600 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1966883665] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:14:55,600 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:14:55,600 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:14:55,600 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916390213] [2021-11-20 23:14:55,601 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:14:55,601 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:14:55,601 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:55,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:14:55,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:14:55,603 INFO L87 Difference]: Start difference. First operand 3435 states and 4870 transitions. Second operand has 3 states, 3 states have (on average 57.0) internal successors, (171), 3 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:56,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:56,426 INFO L93 Difference]: Finished difference Result 8299 states and 11722 transitions. [2021-11-20 23:14:56,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:14:56,427 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 57.0) internal successors, (171), 3 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 176 [2021-11-20 23:14:56,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:56,455 INFO L225 Difference]: With dead ends: 8299 [2021-11-20 23:14:56,455 INFO L226 Difference]: Without dead ends: 4865 [2021-11-20 23:14:56,460 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 23:14:56,463 INFO L933 BasicCegarLoop]: 262 mSDtfsCounter, 129 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 475 mSolverCounterSat, 110 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 266 SdHoareTripleChecker+Invalid, 585 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 110 IncrementalHoareTripleChecker+Valid, 475 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:56,463 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 266 Invalid, 585 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [110 Valid, 475 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 23:14:56,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4865 states. [2021-11-20 23:14:56,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4865 to 4865. [2021-11-20 23:14:56,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4865 states, 4864 states have (on average 1.359580592105263) internal successors, (6613), 4864 states have internal predecessors, (6613), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:56,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4865 states to 4865 states and 6613 transitions. [2021-11-20 23:14:56,609 INFO L78 Accepts]: Start accepts. Automaton has 4865 states and 6613 transitions. Word has length 176 [2021-11-20 23:14:56,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:56,610 INFO L470 AbstractCegarLoop]: Abstraction has 4865 states and 6613 transitions. [2021-11-20 23:14:56,610 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 57.0) internal successors, (171), 3 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:56,610 INFO L276 IsEmpty]: Start isEmpty. Operand 4865 states and 6613 transitions. [2021-11-20 23:14:56,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2021-11-20 23:14:56,623 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:56,623 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:14:56,623 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-20 23:14:56,623 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:56,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:56,624 INFO L85 PathProgramCache]: Analyzing trace with hash -1776267830, now seen corresponding path program 1 times [2021-11-20 23:14:56,624 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:56,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [271197234] [2021-11-20 23:14:56,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:56,625 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:56,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:56,742 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 36 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:14:56,743 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:56,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [271197234] [2021-11-20 23:14:56,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [271197234] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:14:56,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [400485037] [2021-11-20 23:14:56,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:56,744 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:56,744 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:14:56,747 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:14:56,781 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:14:56,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:56,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:14:56,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:14:57,507 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-20 23:14:57,508 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:14:57,508 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [400485037] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:14:57,508 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:14:57,509 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3] total 4 [2021-11-20 23:14:57,509 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489475688] [2021-11-20 23:14:57,509 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:14:57,510 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:14:57,510 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:57,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:14:57,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:14:57,511 INFO L87 Difference]: Start difference. First operand 4865 states and 6613 transitions. Second operand has 3 states, 3 states have (on average 48.666666666666664) internal successors, (146), 2 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:58,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:58,388 INFO L93 Difference]: Finished difference Result 14019 states and 19151 transitions. [2021-11-20 23:14:58,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:14:58,388 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 48.666666666666664) internal successors, (146), 2 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 180 [2021-11-20 23:14:58,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:58,444 INFO L225 Difference]: With dead ends: 14019 [2021-11-20 23:14:58,445 INFO L226 Difference]: Without dead ends: 9155 [2021-11-20 23:14:58,452 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 179 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:14:58,453 INFO L933 BasicCegarLoop]: 119 mSDtfsCounter, 10 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 567 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 605 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 567 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:58,454 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 135 Invalid, 605 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 567 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 23:14:58,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9155 states. [2021-11-20 23:14:58,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9155 to 8297. [2021-11-20 23:14:58,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8297 states, 8296 states have (on average 1.3795805207328833) internal successors, (11445), 8296 states have internal predecessors, (11445), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:58,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8297 states to 8297 states and 11445 transitions. [2021-11-20 23:14:58,680 INFO L78 Accepts]: Start accepts. Automaton has 8297 states and 11445 transitions. Word has length 180 [2021-11-20 23:14:58,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:58,681 INFO L470 AbstractCegarLoop]: Abstraction has 8297 states and 11445 transitions. [2021-11-20 23:14:58,681 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 48.666666666666664) internal successors, (146), 2 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:58,682 INFO L276 IsEmpty]: Start isEmpty. Operand 8297 states and 11445 transitions. [2021-11-20 23:14:58,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2021-11-20 23:14:58,699 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:58,700 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:14:58,731 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:14:58,918 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:58,918 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:58,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:58,919 INFO L85 PathProgramCache]: Analyzing trace with hash -365576805, now seen corresponding path program 1 times [2021-11-20 23:14:58,919 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:58,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1878587349] [2021-11-20 23:14:58,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:58,919 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:58,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:58,986 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-20 23:14:58,987 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:58,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1878587349] [2021-11-20 23:14:58,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1878587349] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:14:58,987 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:14:58,988 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:14:58,988 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376973841] [2021-11-20 23:14:58,988 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:14:58,988 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:14:58,989 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:58,989 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:14:58,989 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:14:58,990 INFO L87 Difference]: Start difference. First operand 8297 states and 11445 transitions. Second operand has 3 states, 3 states have (on average 55.666666666666664) internal successors, (167), 3 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:14:59,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:59,860 INFO L93 Difference]: Finished difference Result 19024 states and 26225 transitions. [2021-11-20 23:14:59,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:14:59,863 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 55.666666666666664) internal successors, (167), 3 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 189 [2021-11-20 23:14:59,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:59,922 INFO L225 Difference]: With dead ends: 19024 [2021-11-20 23:14:59,922 INFO L226 Difference]: Without dead ends: 10871 [2021-11-20 23:14:59,934 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 23:14:59,935 INFO L933 BasicCegarLoop]: 262 mSDtfsCounter, 132 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 449 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 266 SdHoareTripleChecker+Invalid, 578 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 449 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:59,936 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 266 Invalid, 578 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 449 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 23:14:59,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10871 states. [2021-11-20 23:15:00,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10871 to 10442. [2021-11-20 23:15:00,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10442 states, 10441 states have (on average 1.3414423905756154) internal successors, (14006), 10441 states have internal predecessors, (14006), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:00,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10442 states to 10442 states and 14006 transitions. [2021-11-20 23:15:00,183 INFO L78 Accepts]: Start accepts. Automaton has 10442 states and 14006 transitions. Word has length 189 [2021-11-20 23:15:00,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:15:00,183 INFO L470 AbstractCegarLoop]: Abstraction has 10442 states and 14006 transitions. [2021-11-20 23:15:00,184 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 55.666666666666664) internal successors, (167), 3 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:00,184 INFO L276 IsEmpty]: Start isEmpty. Operand 10442 states and 14006 transitions. [2021-11-20 23:15:00,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2021-11-20 23:15:00,203 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:15:00,203 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:15:00,204 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-20 23:15:00,204 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:15:00,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:15:00,205 INFO L85 PathProgramCache]: Analyzing trace with hash -756964145, now seen corresponding path program 1 times [2021-11-20 23:15:00,205 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:15:00,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1487148962] [2021-11-20 23:15:00,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:15:00,205 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:15:00,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:15:00,284 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 44 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-20 23:15:00,285 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:15:00,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1487148962] [2021-11-20 23:15:00,285 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1487148962] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:15:00,285 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:15:00,286 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:15:00,286 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158371801] [2021-11-20 23:15:00,286 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:15:00,287 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:15:00,287 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:15:00,287 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:15:00,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:15:00,288 INFO L87 Difference]: Start difference. First operand 10442 states and 14006 transitions. Second operand has 3 states, 3 states have (on average 57.333333333333336) internal successors, (172), 2 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:01,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:15:01,208 INFO L93 Difference]: Finished difference Result 26319 states and 35397 transitions. [2021-11-20 23:15:01,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:15:01,209 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 57.333333333333336) internal successors, (172), 2 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 189 [2021-11-20 23:15:01,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:15:01,243 INFO L225 Difference]: With dead ends: 26319 [2021-11-20 23:15:01,244 INFO L226 Difference]: Without dead ends: 16021 [2021-11-20 23:15:01,257 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:15:01,258 INFO L933 BasicCegarLoop]: 92 mSDtfsCounter, 137 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 532 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 619 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 532 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:15:01,258 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 96 Invalid, 619 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 532 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 23:15:01,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16021 states. [2021-11-20 23:15:01,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16021 to 15018. [2021-11-20 23:15:01,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15018 states, 15017 states have (on average 1.332756209629087) internal successors, (20014), 15017 states have internal predecessors, (20014), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:01,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15018 states to 15018 states and 20014 transitions. [2021-11-20 23:15:01,562 INFO L78 Accepts]: Start accepts. Automaton has 15018 states and 20014 transitions. Word has length 189 [2021-11-20 23:15:01,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:15:01,563 INFO L470 AbstractCegarLoop]: Abstraction has 15018 states and 20014 transitions. [2021-11-20 23:15:01,563 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 57.333333333333336) internal successors, (172), 2 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:01,563 INFO L276 IsEmpty]: Start isEmpty. Operand 15018 states and 20014 transitions. [2021-11-20 23:15:01,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2021-11-20 23:15:01,587 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:15:01,588 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:15:01,588 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-20 23:15:01,588 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:15:01,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:15:01,589 INFO L85 PathProgramCache]: Analyzing trace with hash 719253552, now seen corresponding path program 1 times [2021-11-20 23:15:01,589 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:15:01,589 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [167211113] [2021-11-20 23:15:01,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:15:01,590 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:15:01,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:15:01,740 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:15:01,740 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:15:01,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [167211113] [2021-11-20 23:15:01,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [167211113] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:15:01,741 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:15:01,741 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:15:01,741 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [272362518] [2021-11-20 23:15:01,742 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:15:01,742 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:15:01,742 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:15:01,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:15:01,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:15:01,744 INFO L87 Difference]: Start difference. First operand 15018 states and 20014 transitions. Second operand has 4 states, 4 states have (on average 48.0) internal successors, (192), 3 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:03,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:15:03,052 INFO L93 Difference]: Finished difference Result 31465 states and 41986 transitions. [2021-11-20 23:15:03,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:15:03,054 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 48.0) internal successors, (192), 3 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 192 [2021-11-20 23:15:03,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:15:03,090 INFO L225 Difference]: With dead ends: 31465 [2021-11-20 23:15:03,090 INFO L226 Difference]: Without dead ends: 16877 [2021-11-20 23:15:03,107 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:15:03,108 INFO L933 BasicCegarLoop]: 100 mSDtfsCounter, 245 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 1011 mSolverCounterSat, 173 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 245 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 1184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 173 IncrementalHoareTripleChecker+Valid, 1011 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:15:03,109 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [245 Valid, 109 Invalid, 1184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [173 Valid, 1011 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-20 23:15:03,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16877 states. [2021-11-20 23:15:03,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16877 to 14875. [2021-11-20 23:15:03,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14875 states, 14874 states have (on average 1.3331316391017884) internal successors, (19829), 14874 states have internal predecessors, (19829), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:03,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14875 states to 14875 states and 19829 transitions. [2021-11-20 23:15:03,512 INFO L78 Accepts]: Start accepts. Automaton has 14875 states and 19829 transitions. Word has length 192 [2021-11-20 23:15:03,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:15:03,512 INFO L470 AbstractCegarLoop]: Abstraction has 14875 states and 19829 transitions. [2021-11-20 23:15:03,513 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 48.0) internal successors, (192), 3 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:03,513 INFO L276 IsEmpty]: Start isEmpty. Operand 14875 states and 19829 transitions. [2021-11-20 23:15:03,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2021-11-20 23:15:03,541 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:15:03,542 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:15:03,542 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-20 23:15:03,543 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:15:03,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:15:03,544 INFO L85 PathProgramCache]: Analyzing trace with hash 180585389, now seen corresponding path program 1 times [2021-11-20 23:15:03,544 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:15:03,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1671825807] [2021-11-20 23:15:03,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:15:03,545 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:15:03,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:15:03,675 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 61 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-20 23:15:03,676 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:15:03,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1671825807] [2021-11-20 23:15:03,676 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1671825807] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:15:03,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [4453922] [2021-11-20 23:15:03,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:15:03,677 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:15:03,677 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:15:03,682 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:15:03,704 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:15:03,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:15:03,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:15:03,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:15:04,173 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-20 23:15:04,173 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:15:04,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [4453922] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:15:04,174 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:15:04,174 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3] total 4 [2021-11-20 23:15:04,174 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1998674182] [2021-11-20 23:15:04,174 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:15:04,175 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:15:04,175 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:15:04,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:15:04,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:15:04,176 INFO L87 Difference]: Start difference. First operand 14875 states and 19829 transitions. Second operand has 3 states, 3 states have (on average 59.0) internal successors, (177), 2 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:04,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:15:04,639 INFO L93 Difference]: Finished difference Result 28176 states and 37574 transitions. [2021-11-20 23:15:04,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:15:04,639 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 59.0) internal successors, (177), 2 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 199 [2021-11-20 23:15:04,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:15:04,666 INFO L225 Difference]: With dead ends: 28176 [2021-11-20 23:15:04,666 INFO L226 Difference]: Without dead ends: 13731 [2021-11-20 23:15:04,682 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 198 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:15:04,683 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 227 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:15:04,683 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [227 Valid, 4 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:15:04,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13731 states. [2021-11-20 23:15:04,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13731 to 13731. [2021-11-20 23:15:04,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13731 states, 13730 states have (on average 1.2815003641660596) internal successors, (17595), 13730 states have internal predecessors, (17595), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:04,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13731 states to 13731 states and 17595 transitions. [2021-11-20 23:15:04,971 INFO L78 Accepts]: Start accepts. Automaton has 13731 states and 17595 transitions. Word has length 199 [2021-11-20 23:15:04,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:15:04,972 INFO L470 AbstractCegarLoop]: Abstraction has 13731 states and 17595 transitions. [2021-11-20 23:15:04,972 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 59.0) internal successors, (177), 2 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:04,972 INFO L276 IsEmpty]: Start isEmpty. Operand 13731 states and 17595 transitions. [2021-11-20 23:15:04,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2021-11-20 23:15:04,992 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:15:04,992 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:15:05,030 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:15:05,218 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-20 23:15:05,218 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:15:05,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:15:05,219 INFO L85 PathProgramCache]: Analyzing trace with hash 1827360236, now seen corresponding path program 1 times [2021-11-20 23:15:05,219 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:15:05,219 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [385297029] [2021-11-20 23:15:05,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:15:05,219 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:15:05,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:15:05,453 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:15:05,453 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:15:05,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [385297029] [2021-11-20 23:15:05,453 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [385297029] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:15:05,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1245161510] [2021-11-20 23:15:05,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:15:05,454 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:15:05,454 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:15:05,462 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:15:05,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:15:05,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:15:05,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 411 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:15:05,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:15:06,107 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2021-11-20 23:15:06,108 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:15:06,108 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1245161510] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:15:06,108 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:15:06,108 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3] total 4 [2021-11-20 23:15:06,109 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991976167] [2021-11-20 23:15:06,109 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:15:06,109 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:15:06,110 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:15:06,110 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:15:06,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:15:06,111 INFO L87 Difference]: Start difference. First operand 13731 states and 17595 transitions. Second operand has 3 states, 3 states have (on average 48.333333333333336) internal successors, (145), 2 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:06,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:15:06,922 INFO L93 Difference]: Finished difference Result 36041 states and 46158 transitions. [2021-11-20 23:15:06,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:15:06,923 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 48.333333333333336) internal successors, (145), 2 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 245 [2021-11-20 23:15:06,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:15:06,973 INFO L225 Difference]: With dead ends: 36041 [2021-11-20 23:15:06,973 INFO L226 Difference]: Without dead ends: 22740 [2021-11-20 23:15:06,985 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 244 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:15:06,985 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 31 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 508 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 555 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 23:15:06,986 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 71 Invalid, 555 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 508 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 23:15:07,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22740 states. [2021-11-20 23:15:07,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22740 to 19880. [2021-11-20 23:15:07,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19880 states, 19879 states have (on average 1.2662105739725338) internal successors, (25171), 19879 states have internal predecessors, (25171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:07,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19880 states to 19880 states and 25171 transitions. [2021-11-20 23:15:07,454 INFO L78 Accepts]: Start accepts. Automaton has 19880 states and 25171 transitions. Word has length 245 [2021-11-20 23:15:07,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:15:07,455 INFO L470 AbstractCegarLoop]: Abstraction has 19880 states and 25171 transitions. [2021-11-20 23:15:07,455 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 48.333333333333336) internal successors, (145), 2 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:07,455 INFO L276 IsEmpty]: Start isEmpty. Operand 19880 states and 25171 transitions. [2021-11-20 23:15:07,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 267 [2021-11-20 23:15:07,483 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:15:07,484 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:15:07,523 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:15:07,710 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-20 23:15:07,710 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:15:07,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:15:07,711 INFO L85 PathProgramCache]: Analyzing trace with hash -612891310, now seen corresponding path program 1 times [2021-11-20 23:15:07,711 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:15:07,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [949210624] [2021-11-20 23:15:07,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:15:07,711 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:15:07,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:15:08,018 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 150 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-20 23:15:08,018 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:15:08,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [949210624] [2021-11-20 23:15:08,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [949210624] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:15:08,019 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:15:08,019 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:15:08,020 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316081921] [2021-11-20 23:15:08,020 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:15:08,020 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:15:08,021 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:15:08,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:15:08,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:15:08,022 INFO L87 Difference]: Start difference. First operand 19880 states and 25171 transitions. Second operand has 4 states, 4 states have (on average 62.0) internal successors, (248), 3 states have internal predecessors, (248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:08,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:15:08,961 INFO L93 Difference]: Finished difference Result 40617 states and 51541 transitions. [2021-11-20 23:15:08,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:15:08,962 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 62.0) internal successors, (248), 3 states have internal predecessors, (248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 266 [2021-11-20 23:15:08,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:15:08,994 INFO L225 Difference]: With dead ends: 40617 [2021-11-20 23:15:08,995 INFO L226 Difference]: Without dead ends: 19737 [2021-11-20 23:15:09,008 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:15:09,009 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 453 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 492 mSolverCounterSat, 203 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 453 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 695 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 203 IncrementalHoareTripleChecker+Valid, 492 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 23:15:09,009 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [453 Valid, 9 Invalid, 695 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [203 Valid, 492 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 23:15:09,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19737 states. [2021-11-20 23:15:09,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19737 to 16591. [2021-11-20 23:15:09,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16591 states, 16590 states have (on average 1.2019288728149489) internal successors, (19940), 16590 states have internal predecessors, (19940), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:09,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16591 states to 16591 states and 19940 transitions. [2021-11-20 23:15:09,581 INFO L78 Accepts]: Start accepts. Automaton has 16591 states and 19940 transitions. Word has length 266 [2021-11-20 23:15:09,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:15:09,582 INFO L470 AbstractCegarLoop]: Abstraction has 16591 states and 19940 transitions. [2021-11-20 23:15:09,582 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 62.0) internal successors, (248), 3 states have internal predecessors, (248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:09,582 INFO L276 IsEmpty]: Start isEmpty. Operand 16591 states and 19940 transitions. [2021-11-20 23:15:09,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 272 [2021-11-20 23:15:09,595 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:15:09,595 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:15:09,595 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-20 23:15:09,596 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:15:09,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:15:09,596 INFO L85 PathProgramCache]: Analyzing trace with hash -1193553047, now seen corresponding path program 1 times [2021-11-20 23:15:09,597 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:15:09,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113137049] [2021-11-20 23:15:09,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:15:09,597 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:15:09,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:15:09,811 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 127 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 23:15:09,811 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:15:09,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1113137049] [2021-11-20 23:15:09,811 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1113137049] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:15:09,812 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:15:09,812 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:15:09,812 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204778359] [2021-11-20 23:15:09,812 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:15:09,813 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:15:09,813 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:15:09,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:15:09,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:15:09,814 INFO L87 Difference]: Start difference. First operand 16591 states and 19940 transitions. Second operand has 3 states, 3 states have (on average 88.66666666666667) internal successors, (266), 3 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:10,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:15:10,551 INFO L93 Difference]: Finished difference Result 34325 states and 40856 transitions. [2021-11-20 23:15:10,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:15:10,552 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 88.66666666666667) internal successors, (266), 3 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 271 [2021-11-20 23:15:10,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:15:10,580 INFO L225 Difference]: With dead ends: 34325 [2021-11-20 23:15:10,581 INFO L226 Difference]: Without dead ends: 17735 [2021-11-20 23:15:10,591 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 23:15:10,592 INFO L933 BasicCegarLoop]: 173 mSDtfsCounter, 11 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 386 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 480 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:15:10,592 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 177 Invalid, 480 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 386 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 23:15:10,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17735 states. [2021-11-20 23:15:10,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17735 to 17020. [2021-11-20 23:15:10,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17020 states, 17019 states have (on average 1.1614078382983724) internal successors, (19766), 17019 states have internal predecessors, (19766), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:10,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17020 states to 17020 states and 19766 transitions. [2021-11-20 23:15:10,964 INFO L78 Accepts]: Start accepts. Automaton has 17020 states and 19766 transitions. Word has length 271 [2021-11-20 23:15:10,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:15:10,965 INFO L470 AbstractCegarLoop]: Abstraction has 17020 states and 19766 transitions. [2021-11-20 23:15:10,965 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 88.66666666666667) internal successors, (266), 3 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:10,965 INFO L276 IsEmpty]: Start isEmpty. Operand 17020 states and 19766 transitions. [2021-11-20 23:15:10,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 291 [2021-11-20 23:15:10,985 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:15:10,985 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:15:10,986 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-20 23:15:10,986 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:15:10,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:15:10,987 INFO L85 PathProgramCache]: Analyzing trace with hash 125350952, now seen corresponding path program 1 times [2021-11-20 23:15:10,987 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:15:10,987 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1049539953] [2021-11-20 23:15:10,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:15:10,988 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:15:11,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:15:11,175 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 171 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 23:15:11,176 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:15:11,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1049539953] [2021-11-20 23:15:11,176 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1049539953] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:15:11,176 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:15:11,177 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:15:11,177 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647306162] [2021-11-20 23:15:11,177 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:15:11,178 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:15:11,178 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:15:11,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:15:11,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:15:11,179 INFO L87 Difference]: Start difference. First operand 17020 states and 19766 transitions. Second operand has 3 states, 3 states have (on average 95.0) internal successors, (285), 3 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:12,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:15:12,009 INFO L93 Difference]: Finished difference Result 35612 states and 41424 transitions. [2021-11-20 23:15:12,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:15:12,010 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 95.0) internal successors, (285), 3 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 290 [2021-11-20 23:15:12,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:15:12,036 INFO L225 Difference]: With dead ends: 35612 [2021-11-20 23:15:12,036 INFO L226 Difference]: Without dead ends: 18736 [2021-11-20 23:15:12,049 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 23:15:12,051 INFO L933 BasicCegarLoop]: 172 mSDtfsCounter, 141 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 370 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 370 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 23:15:12,051 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [141 Valid, 175 Invalid, 491 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 370 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 23:15:12,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18736 states. [2021-11-20 23:15:12,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18736 to 16162. [2021-11-20 23:15:12,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16162 states, 16161 states have (on average 1.149248190087247) internal successors, (18573), 16161 states have internal predecessors, (18573), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:12,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16162 states to 16162 states and 18573 transitions. [2021-11-20 23:15:12,474 INFO L78 Accepts]: Start accepts. Automaton has 16162 states and 18573 transitions. Word has length 290 [2021-11-20 23:15:12,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:15:12,475 INFO L470 AbstractCegarLoop]: Abstraction has 16162 states and 18573 transitions. [2021-11-20 23:15:12,475 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 95.0) internal successors, (285), 3 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:12,475 INFO L276 IsEmpty]: Start isEmpty. Operand 16162 states and 18573 transitions. [2021-11-20 23:15:12,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2021-11-20 23:15:12,492 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:15:12,493 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:15:12,493 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-20 23:15:12,493 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:15:12,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:15:12,494 INFO L85 PathProgramCache]: Analyzing trace with hash 1500835743, now seen corresponding path program 1 times [2021-11-20 23:15:12,494 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:15:12,495 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1968001973] [2021-11-20 23:15:12,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:15:12,495 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:15:12,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:15:12,616 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 99 proven. 6 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2021-11-20 23:15:12,616 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:15:12,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1968001973] [2021-11-20 23:15:12,616 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1968001973] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:15:12,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1920465819] [2021-11-20 23:15:12,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:15:12,617 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:15:12,617 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:15:12,621 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:15:12,642 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:15:12,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:15:12,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 596 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:15:12,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:15:13,753 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 224 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-20 23:15:13,753 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:15:13,754 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1920465819] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:15:13,754 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:15:13,754 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-20 23:15:13,754 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588368371] [2021-11-20 23:15:13,754 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:15:13,755 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:15:13,755 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:15:13,756 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:15:13,756 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:15:13,756 INFO L87 Difference]: Start difference. First operand 16162 states and 18573 transitions. Second operand has 3 states, 3 states have (on average 96.33333333333333) internal successors, (289), 3 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:14,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:15:14,423 INFO L93 Difference]: Finished difference Result 33324 states and 38327 transitions. [2021-11-20 23:15:14,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:15:14,423 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 96.33333333333333) internal successors, (289), 3 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 324 [2021-11-20 23:15:14,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:15:14,440 INFO L225 Difference]: With dead ends: 33324 [2021-11-20 23:15:14,440 INFO L226 Difference]: Without dead ends: 17735 [2021-11-20 23:15:14,450 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 326 GetRequests, 323 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:15:14,451 INFO L933 BasicCegarLoop]: 195 mSDtfsCounter, 140 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 409 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 460 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 409 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:15:14,451 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [140 Valid, 199 Invalid, 460 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 409 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:15:14,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17735 states. [2021-11-20 23:15:14,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17735 to 17020. [2021-11-20 23:15:14,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17020 states, 17019 states have (on average 1.1507726658440567) internal successors, (19585), 17019 states have internal predecessors, (19585), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:14,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17020 states to 17020 states and 19585 transitions. [2021-11-20 23:15:14,859 INFO L78 Accepts]: Start accepts. Automaton has 17020 states and 19585 transitions. Word has length 324 [2021-11-20 23:15:14,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:15:14,860 INFO L470 AbstractCegarLoop]: Abstraction has 17020 states and 19585 transitions. [2021-11-20 23:15:14,860 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 96.33333333333333) internal successors, (289), 3 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:15:14,860 INFO L276 IsEmpty]: Start isEmpty. Operand 17020 states and 19585 transitions. [2021-11-20 23:15:14,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2021-11-20 23:15:14,880 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:15:14,882 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:15:14,907 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 23:15:15,094 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:15:15,094 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:15:15,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:15:15,095 INFO L85 PathProgramCache]: Analyzing trace with hash -58552367, now seen corresponding path program 1 times [2021-11-20 23:15:15,095 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:15:15,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1642304139] [2021-11-20 23:15:15,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:15:15,095 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:15:15,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:15:15,307 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 218 proven. 18 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-20 23:15:15,307 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:15:15,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1642304139] [2021-11-20 23:15:15,308 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1642304139] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:15:15,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [641536180] [2021-11-20 23:15:15,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:15:15,308 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:15:15,308 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:15:15,314 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:15:15,336 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a8026eb-dd78-4270-98ca-fbe0c9058626/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:15:15,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:15:15,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 597 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:15:15,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:15:16,163 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 205 proven. 40 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-20 23:15:16,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:15:16,844 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 205 proven. 40 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-20 23:15:16,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [641536180] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:15:16,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2106534641] [2021-11-20 23:15:16,883 INFO L159 IcfgInterpreter]: Started Sifa with 145 locations of interest [2021-11-20 23:15:16,883 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:15:16,887 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:15:16,892 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:15:16,893 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs