./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/sendmail-close-angle.i --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_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/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_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/sendmail-close-angle.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/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_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/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 4be4b344509b887bc91f2389f98de1e4ff745494aee0f078864fd49e79b0b4b8 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:11:35,996 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:11:35,998 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:11:36,034 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:11:36,035 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:11:36,036 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:11:36,038 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:11:36,041 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:11:36,043 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:11:36,045 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:11:36,046 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:11:36,047 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:11:36,048 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:11:36,049 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:11:36,051 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:11:36,053 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:11:36,054 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:11:36,055 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:11:36,058 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:11:36,061 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:11:36,063 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:11:36,065 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:11:36,067 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:11:36,068 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:11:36,072 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:11:36,073 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:11:36,073 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:11:36,075 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:11:36,075 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:11:36,077 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:11:36,077 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:11:36,078 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:11:36,079 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:11:36,080 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:11:36,082 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:11:36,082 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:11:36,083 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:11:36,084 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:11:36,084 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:11:36,085 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:11:36,086 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:11:36,087 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 00:11:36,115 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:11:36,116 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:11:36,116 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:11:36,116 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:11:36,117 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:11:36,117 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:11:36,117 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:11:36,118 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:11:36,118 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:11:36,118 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:11:36,118 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:11:36,119 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:11:36,119 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:11:36,119 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:11:36,119 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:11:36,119 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:11:36,120 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:11:36,120 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:11:36,121 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:11:36,121 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:11:36,121 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:11:36,121 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:11:36,121 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:11:36,122 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 00:11:36,122 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:11:36,122 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 00:11:36,122 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:11:36,122 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 00:11:36,123 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:11:36,123 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 00:11:36,123 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:11:36,123 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:11:36,124 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:11:36,124 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:11:36,124 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:11:36,124 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 00:11:36,124 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:11:36,125 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:11:36,125 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 00:11:36,125 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:11:36,125 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:11:36,125 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_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4be4b344509b887bc91f2389f98de1e4ff745494aee0f078864fd49e79b0b4b8 [2021-11-21 00:11:36,369 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:11:36,390 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:11:36,393 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:11:36,394 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:11:36,396 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:11:36,397 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/loop-invgen/sendmail-close-angle.i [2021-11-21 00:11:36,473 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/data/67b116608/d71bc094751d4481887690d466b755ef/FLAGdaf5160fb [2021-11-21 00:11:37,026 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:11:37,027 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/sv-benchmarks/c/loop-invgen/sendmail-close-angle.i [2021-11-21 00:11:37,039 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/data/67b116608/d71bc094751d4481887690d466b755ef/FLAGdaf5160fb [2021-11-21 00:11:37,359 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/data/67b116608/d71bc094751d4481887690d466b755ef [2021-11-21 00:11:37,361 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:11:37,363 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:11:37,364 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:11:37,365 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:11:37,368 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:11:37,369 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:11:37" (1/1) ... [2021-11-21 00:11:37,372 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@799f5cfc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:11:37, skipping insertion in model container [2021-11-21 00:11:37,372 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:11:37" (1/1) ... [2021-11-21 00:11:37,379 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:11:37,398 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:11:37,571 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_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/sv-benchmarks/c/loop-invgen/sendmail-close-angle.i[893,906] [2021-11-21 00:11:37,598 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:11:37,605 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:11:37,622 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_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/sv-benchmarks/c/loop-invgen/sendmail-close-angle.i[893,906] [2021-11-21 00:11:37,641 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:11:37,656 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:11:37,657 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:11:37 WrapperNode [2021-11-21 00:11:37,657 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:11:37,659 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:11:37,659 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:11:37,659 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:11:37,665 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:11:37" (1/1) ... [2021-11-21 00:11:37,671 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:11:37" (1/1) ... [2021-11-21 00:11:37,688 INFO L137 Inliner]: procedures = 16, calls = 14, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 60 [2021-11-21 00:11:37,688 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:11:37,689 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:11:37,689 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:11:37,689 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:11:37,698 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:11:37" (1/1) ... [2021-11-21 00:11:37,698 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:11:37" (1/1) ... [2021-11-21 00:11:37,700 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:11:37" (1/1) ... [2021-11-21 00:11:37,700 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:11:37" (1/1) ... [2021-11-21 00:11:37,703 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:11:37" (1/1) ... [2021-11-21 00:11:37,707 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:11:37" (1/1) ... [2021-11-21 00:11:37,708 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:11:37" (1/1) ... [2021-11-21 00:11:37,713 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:11:37,720 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:11:37,720 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:11:37,721 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:11:37,722 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:11:37" (1/1) ... [2021-11-21 00:11:37,729 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:11:37,740 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:11:37,754 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:11:37,772 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:11:37,802 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:11:37,802 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 00:11:37,803 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:11:37,803 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:11:37,803 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-21 00:11:37,803 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-21 00:11:37,860 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:11:37,861 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:11:37,989 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:11:38,005 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:11:38,005 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-21 00:11:38,008 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:11:38 BoogieIcfgContainer [2021-11-21 00:11:38,008 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:11:38,010 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:11:38,010 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:11:38,013 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:11:38,014 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:11:37" (1/3) ... [2021-11-21 00:11:38,014 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ac991b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:11:38, skipping insertion in model container [2021-11-21 00:11:38,015 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:11:37" (2/3) ... [2021-11-21 00:11:38,015 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ac991b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:11:38, skipping insertion in model container [2021-11-21 00:11:38,015 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:11:38" (3/3) ... [2021-11-21 00:11:38,017 INFO L111 eAbstractionObserver]: Analyzing ICFG sendmail-close-angle.i [2021-11-21 00:11:38,033 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:11:38,033 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 00:11:38,129 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:11:38,137 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 00:11:38,137 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 00:11:38,154 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 17 states have internal predecessors, (23), 8 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-21 00:11:38,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-21 00:11:38,160 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:11:38,160 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:11:38,161 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:11:38,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:11:38,166 INFO L85 PathProgramCache]: Analyzing trace with hash -802314430, now seen corresponding path program 1 times [2021-11-21 00:11:38,175 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:11:38,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [647772999] [2021-11-21 00:11:38,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:11:38,177 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:11:38,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:11:38,363 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:11:38,364 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:11:38,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [647772999] [2021-11-21 00:11:38,366 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [647772999] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:11:38,367 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:11:38,367 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:11:38,369 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304066572] [2021-11-21 00:11:38,369 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:11:38,375 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-21 00:11:38,376 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:11:38,410 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-21 00:11:38,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-21 00:11:38,415 INFO L87 Difference]: Start difference. First operand has 26 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 17 states have internal predecessors, (23), 8 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:11:38,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:11:38,465 INFO L93 Difference]: Finished difference Result 48 states and 79 transitions. [2021-11-21 00:11:38,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-21 00:11:38,486 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-21 00:11:38,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:11:38,494 INFO L225 Difference]: With dead ends: 48 [2021-11-21 00:11:38,495 INFO L226 Difference]: Without dead ends: 23 [2021-11-21 00:11:38,499 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-21 00:11:38,510 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:11:38,512 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 33 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:11:38,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-21 00:11:38,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-11-21 00:11:38,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 15 states have internal predecessors, (16), 8 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-21 00:11:38,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2021-11-21 00:11:38,573 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 9 [2021-11-21 00:11:38,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:11:38,574 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2021-11-21 00:11:38,575 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:11:38,575 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2021-11-21 00:11:38,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-21 00:11:38,578 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:11:38,578 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:11:38,579 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:11:38,580 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:11:38,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:11:38,584 INFO L85 PathProgramCache]: Analyzing trace with hash 310336716, now seen corresponding path program 1 times [2021-11-21 00:11:38,585 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:11:38,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1820821617] [2021-11-21 00:11:38,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:11:38,586 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:11:38,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:11:38,749 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:11:38,750 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:11:38,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1820821617] [2021-11-21 00:11:38,751 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1820821617] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:11:38,752 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:11:38,752 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 00:11:38,752 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77990] [2021-11-21 00:11:38,752 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:11:38,753 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:11:38,755 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:11:38,756 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:11:38,757 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:11:38,757 INFO L87 Difference]: Start difference. First operand 23 states and 31 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:11:38,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:11:38,858 INFO L93 Difference]: Finished difference Result 29 states and 36 transitions. [2021-11-21 00:11:38,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:11:38,858 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-21 00:11:38,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:11:38,859 INFO L225 Difference]: With dead ends: 29 [2021-11-21 00:11:38,859 INFO L226 Difference]: Without dead ends: 27 [2021-11-21 00:11:38,864 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:11:38,867 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 9 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:11:38,867 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 64 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:11:38,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-21 00:11:38,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-11-21 00:11:38,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 16 states have (on average 1.1875) internal successors, (19), 18 states have internal predecessors, (19), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-21 00:11:38,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2021-11-21 00:11:38,897 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 10 [2021-11-21 00:11:38,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:11:38,897 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2021-11-21 00:11:38,898 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:11:38,898 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2021-11-21 00:11:38,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-21 00:11:38,899 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:11:38,899 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:11:38,899 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 00:11:38,900 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:11:38,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:11:38,900 INFO L85 PathProgramCache]: Analyzing trace with hash 340662799, now seen corresponding path program 1 times [2021-11-21 00:11:38,901 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:11:38,901 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [809139909] [2021-11-21 00:11:38,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:11:38,901 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:11:38,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:11:39,067 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:11:39,067 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:11:39,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [809139909] [2021-11-21 00:11:39,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [809139909] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:11:39,068 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:11:39,068 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 00:11:39,068 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21119502] [2021-11-21 00:11:39,068 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:11:39,069 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:11:39,069 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:11:39,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:11:39,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:11:39,070 INFO L87 Difference]: Start difference. First operand 27 states and 34 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-21 00:11:39,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:11:39,208 INFO L93 Difference]: Finished difference Result 42 states and 54 transitions. [2021-11-21 00:11:39,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 00:11:39,209 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-11-21 00:11:39,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:11:39,212 INFO L225 Difference]: With dead ends: 42 [2021-11-21 00:11:39,212 INFO L226 Difference]: Without dead ends: 40 [2021-11-21 00:11:39,213 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:11:39,214 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 20 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:11:39,215 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 101 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:11:39,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-21 00:11:39,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 38. [2021-11-21 00:11:39,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 25 states have internal predecessors, (27), 12 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 9 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-21 00:11:39,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 50 transitions. [2021-11-21 00:11:39,238 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 50 transitions. Word has length 15 [2021-11-21 00:11:39,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:11:39,239 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 50 transitions. [2021-11-21 00:11:39,239 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-21 00:11:39,239 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 50 transitions. [2021-11-21 00:11:39,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-21 00:11:39,240 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:11:39,241 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:11:39,241 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-21 00:11:39,241 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:11:39,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:11:39,242 INFO L85 PathProgramCache]: Analyzing trace with hash 1687915168, now seen corresponding path program 1 times [2021-11-21 00:11:39,242 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:11:39,242 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [843811587] [2021-11-21 00:11:39,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:11:39,243 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:11:39,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:11:39,356 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:11:39,357 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:11:39,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [843811587] [2021-11-21 00:11:39,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [843811587] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:11:39,357 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:11:39,358 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 00:11:39,358 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229368303] [2021-11-21 00:11:39,358 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:11:39,358 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:11:39,359 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:11:39,359 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:11:39,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:11:39,360 INFO L87 Difference]: Start difference. First operand 38 states and 50 transitions. Second operand has 6 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-21 00:11:39,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:11:39,442 INFO L93 Difference]: Finished difference Result 48 states and 60 transitions. [2021-11-21 00:11:39,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 00:11:39,443 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 22 [2021-11-21 00:11:39,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:11:39,444 INFO L225 Difference]: With dead ends: 48 [2021-11-21 00:11:39,444 INFO L226 Difference]: Without dead ends: 46 [2021-11-21 00:11:39,445 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:11:39,446 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 13 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:11:39,447 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 170 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:11:39,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-21 00:11:39,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 42. [2021-11-21 00:11:39,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 25 states have (on average 1.2) internal successors, (30), 28 states have internal predecessors, (30), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (11), 9 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-21 00:11:39,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 53 transitions. [2021-11-21 00:11:39,467 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 53 transitions. Word has length 22 [2021-11-21 00:11:39,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:11:39,467 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 53 transitions. [2021-11-21 00:11:39,468 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-21 00:11:39,468 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 53 transitions. [2021-11-21 00:11:39,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-21 00:11:39,470 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:11:39,471 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:11:39,471 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-21 00:11:39,471 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:11:39,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:11:39,472 INFO L85 PathProgramCache]: Analyzing trace with hash -194088064, now seen corresponding path program 1 times [2021-11-21 00:11:39,472 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:11:39,473 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2054514244] [2021-11-21 00:11:39,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:11:39,473 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:11:39,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:11:39,589 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:11:39,589 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:11:39,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2054514244] [2021-11-21 00:11:39,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2054514244] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:11:39,590 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:11:39,590 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-21 00:11:39,590 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429625919] [2021-11-21 00:11:39,592 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:11:39,593 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:11:39,593 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:11:39,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:11:39,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:11:39,594 INFO L87 Difference]: Start difference. First operand 42 states and 53 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 00:11:39,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:11:39,773 INFO L93 Difference]: Finished difference Result 67 states and 85 transitions. [2021-11-21 00:11:39,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:11:39,773 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2021-11-21 00:11:39,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:11:39,777 INFO L225 Difference]: With dead ends: 67 [2021-11-21 00:11:39,777 INFO L226 Difference]: Without dead ends: 60 [2021-11-21 00:11:39,779 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-11-21 00:11:39,789 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 31 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:11:39,790 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 116 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:11:39,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-21 00:11:39,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2021-11-21 00:11:39,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 35 states have (on average 1.1428571428571428) internal successors, (40), 38 states have internal predecessors, (40), 16 states have call successors, (16), 6 states have call predecessors, (16), 6 states have return successors, (15), 13 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-21 00:11:39,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 71 transitions. [2021-11-21 00:11:39,810 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 71 transitions. Word has length 26 [2021-11-21 00:11:39,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:11:39,811 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 71 transitions. [2021-11-21 00:11:39,811 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 00:11:39,815 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 71 transitions. [2021-11-21 00:11:39,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-21 00:11:39,816 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:11:39,817 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:11:39,817 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-21 00:11:39,817 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:11:39,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:11:39,818 INFO L85 PathProgramCache]: Analyzing trace with hash -414236357, now seen corresponding path program 1 times [2021-11-21 00:11:39,818 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:11:39,818 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [94532720] [2021-11-21 00:11:39,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:11:39,818 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:11:39,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:11:39,915 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:11:39,915 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:11:39,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [94532720] [2021-11-21 00:11:39,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [94532720] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:11:39,915 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:11:39,915 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-21 00:11:39,916 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468966733] [2021-11-21 00:11:39,916 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:11:39,916 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:11:39,917 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:11:39,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:11:39,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:11:39,918 INFO L87 Difference]: Start difference. First operand 58 states and 71 transitions. Second operand has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 00:11:40,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:11:40,029 INFO L93 Difference]: Finished difference Result 68 states and 81 transitions. [2021-11-21 00:11:40,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:11:40,030 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2021-11-21 00:11:40,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:11:40,033 INFO L225 Difference]: With dead ends: 68 [2021-11-21 00:11:40,034 INFO L226 Difference]: Without dead ends: 66 [2021-11-21 00:11:40,034 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:11:40,038 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 30 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:11:40,040 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 144 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:11:40,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-11-21 00:11:40,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 62. [2021-11-21 00:11:40,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 38 states have (on average 1.131578947368421) internal successors, (43), 41 states have internal predecessors, (43), 16 states have call successors, (16), 7 states have call predecessors, (16), 7 states have return successors, (15), 13 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-21 00:11:40,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 74 transitions. [2021-11-21 00:11:40,063 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 74 transitions. Word has length 27 [2021-11-21 00:11:40,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:11:40,063 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 74 transitions. [2021-11-21 00:11:40,064 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 00:11:40,064 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 74 transitions. [2021-11-21 00:11:40,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-21 00:11:40,072 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:11:40,073 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 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] [2021-11-21 00:11:40,073 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-21 00:11:40,073 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:11:40,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:11:40,090 INFO L85 PathProgramCache]: Analyzing trace with hash -911118985, now seen corresponding path program 1 times [2021-11-21 00:11:40,090 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:11:40,090 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1417227222] [2021-11-21 00:11:40,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:11:40,091 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:11:40,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:11:40,306 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 14 proven. 2 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-21 00:11:40,306 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:11:40,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1417227222] [2021-11-21 00:11:40,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1417227222] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:11:40,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [903744694] [2021-11-21 00:11:40,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:11:40,307 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:11:40,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:11:40,313 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:11:40,332 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:11:40,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:11:40,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 00:11:40,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:11:40,859 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 14 proven. 2 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-21 00:11:40,859 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:11:41,077 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 14 proven. 2 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-21 00:11:41,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [903744694] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:11:41,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1249522516] [2021-11-21 00:11:41,095 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2021-11-21 00:11:41,095 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:11:41,100 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:11:41,105 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:11:41,106 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:11:50,656 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 00:11:50,738 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:11:51,844 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:11:51,844 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:11:51,844 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2021-11-21 00:11:51,845 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576039894] [2021-11-21 00:11:51,845 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:11:51,845 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-21 00:11:51,846 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:11:51,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-21 00:11:51,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=930, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 00:11:51,847 INFO L87 Difference]: Start difference. First operand 62 states and 74 transitions. Second operand has 17 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 7 states have call successors, (19), 3 states have call predecessors, (19), 1 states have return successors, (16), 7 states have call predecessors, (16), 7 states have call successors, (16) [2021-11-21 00:11:52,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:11:52,383 INFO L93 Difference]: Finished difference Result 105 states and 140 transitions. [2021-11-21 00:11:52,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 00:11:52,383 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 7 states have call successors, (19), 3 states have call predecessors, (19), 1 states have return successors, (16), 7 states have call predecessors, (16), 7 states have call successors, (16) Word has length 50 [2021-11-21 00:11:52,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:11:52,386 INFO L225 Difference]: With dead ends: 105 [2021-11-21 00:11:52,386 INFO L226 Difference]: Without dead ends: 90 [2021-11-21 00:11:52,387 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 120 SyntacticMatches, 6 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 672 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=254, Invalid=1552, Unknown=0, NotChecked=0, Total=1806 [2021-11-21 00:11:52,388 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 49 mSDsluCounter, 249 mSDsCounter, 0 mSdLazyCounter, 299 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 286 SdHoareTripleChecker+Invalid, 391 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 299 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:11:52,389 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 286 Invalid, 391 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 299 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:11:52,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-11-21 00:11:52,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 82. [2021-11-21 00:11:52,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 52 states have internal predecessors, (54), 24 states have call successors, (24), 8 states have call predecessors, (24), 8 states have return successors, (23), 21 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-21 00:11:52,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 101 transitions. [2021-11-21 00:11:52,401 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 101 transitions. Word has length 50 [2021-11-21 00:11:52,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:11:52,402 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 101 transitions. [2021-11-21 00:11:52,402 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 7 states have call successors, (19), 3 states have call predecessors, (19), 1 states have return successors, (16), 7 states have call predecessors, (16), 7 states have call successors, (16) [2021-11-21 00:11:52,402 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 101 transitions. [2021-11-21 00:11:52,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-21 00:11:52,403 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:11:52,403 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:11:52,446 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:11:52,628 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-21 00:11:52,628 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:11:52,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:11:52,629 INFO L85 PathProgramCache]: Analyzing trace with hash -1167358428, now seen corresponding path program 1 times [2021-11-21 00:11:52,629 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:11:52,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1253905998] [2021-11-21 00:11:52,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:11:52,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:11:52,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:11:52,712 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 14 proven. 8 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-21 00:11:52,713 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:11:52,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1253905998] [2021-11-21 00:11:52,713 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1253905998] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:11:52,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1360286203] [2021-11-21 00:11:52,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:11:52,714 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:11:52,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:11:52,715 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:11:52,721 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:11:52,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:11:52,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 00:11:52,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:11:52,978 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 14 proven. 8 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-21 00:11:52,978 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:11:53,105 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 14 proven. 8 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-21 00:11:53,106 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1360286203] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:11:53,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [464898556] [2021-11-21 00:11:53,108 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-21 00:11:53,108 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:11:53,109 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:11:53,109 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:11:53,109 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:12:00,061 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2021-11-21 00:12:00,144 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:12:00,845 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:12:00,845 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:12:00,845 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2021-11-21 00:12:00,845 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662372395] [2021-11-21 00:12:00,846 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:12:00,846 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-21 00:12:00,846 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:12:00,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-21 00:12:00,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=610, Unknown=0, NotChecked=0, Total=702 [2021-11-21 00:12:00,848 INFO L87 Difference]: Start difference. First operand 82 states and 101 transitions. Second operand has 14 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 states have internal predecessors, (34), 7 states have call successors, (19), 3 states have call predecessors, (19), 1 states have return successors, (16), 7 states have call predecessors, (16), 7 states have call successors, (16) [2021-11-21 00:12:00,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:12:00,976 INFO L93 Difference]: Finished difference Result 88 states and 106 transitions. [2021-11-21 00:12:00,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-21 00:12:00,977 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 states have internal predecessors, (34), 7 states have call successors, (19), 3 states have call predecessors, (19), 1 states have return successors, (16), 7 states have call predecessors, (16), 7 states have call successors, (16) Word has length 51 [2021-11-21 00:12:00,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:12:00,979 INFO L225 Difference]: With dead ends: 88 [2021-11-21 00:12:00,979 INFO L226 Difference]: Without dead ends: 86 [2021-11-21 00:12:00,980 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 129 SyntacticMatches, 5 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 338 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=124, Invalid=806, Unknown=0, NotChecked=0, Total=930 [2021-11-21 00:12:00,981 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 32 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 260 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:12:00,981 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 260 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:12:00,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-21 00:12:00,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2021-11-21 00:12:00,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 52 states have (on average 1.0961538461538463) internal successors, (57), 55 states have internal predecessors, (57), 24 states have call successors, (24), 9 states have call predecessors, (24), 9 states have return successors, (23), 21 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-21 00:12:00,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 104 transitions. [2021-11-21 00:12:00,992 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 104 transitions. Word has length 51 [2021-11-21 00:12:00,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:12:00,993 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 104 transitions. [2021-11-21 00:12:00,993 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 states have internal predecessors, (34), 7 states have call successors, (19), 3 states have call predecessors, (19), 1 states have return successors, (16), 7 states have call predecessors, (16), 7 states have call successors, (16) [2021-11-21 00:12:00,993 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 104 transitions. [2021-11-21 00:12:00,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-21 00:12:00,994 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:12:00,994 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2021-11-21 00:12:01,036 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:12:01,220 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-21 00:12:01,220 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:12:01,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:12:01,221 INFO L85 PathProgramCache]: Analyzing trace with hash 502390797, now seen corresponding path program 2 times [2021-11-21 00:12:01,221 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:12:01,221 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1057900454] [2021-11-21 00:12:01,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:12:01,221 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:12:01,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:12:01,326 INFO L134 CoverageAnalysis]: Checked inductivity of 266 backedges. 48 proven. 21 refuted. 0 times theorem prover too weak. 197 trivial. 0 not checked. [2021-11-21 00:12:01,326 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:12:01,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1057900454] [2021-11-21 00:12:01,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1057900454] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:12:01,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [491760559] [2021-11-21 00:12:01,327 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:12:01,327 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:12:01,327 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:12:01,339 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:12:01,340 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:12:01,391 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-21 00:12:01,391 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:12:01,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 00:12:01,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:12:01,715 INFO L134 CoverageAnalysis]: Checked inductivity of 266 backedges. 22 proven. 24 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-11-21 00:12:01,715 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:12:01,966 INFO L134 CoverageAnalysis]: Checked inductivity of 266 backedges. 22 proven. 24 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-11-21 00:12:01,966 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [491760559] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:12:01,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1934549615] [2021-11-21 00:12:01,969 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-21 00:12:01,969 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:12:01,969 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:12:01,970 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:12:01,970 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:12:07,873 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2021-11-21 00:12:07,944 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:12:08,625 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:12:08,626 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:12:08,626 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 20 [2021-11-21 00:12:08,626 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [941185408] [2021-11-21 00:12:08,626 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:12:08,627 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-21 00:12:08,627 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:12:08,627 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-21 00:12:08,628 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=938, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 00:12:08,628 INFO L87 Difference]: Start difference. First operand 86 states and 104 transitions. Second operand has 20 states, 18 states have (on average 2.8333333333333335) internal successors, (51), 19 states have internal predecessors, (51), 10 states have call successors, (31), 3 states have call predecessors, (31), 2 states have return successors, (29), 10 states have call predecessors, (29), 10 states have call successors, (29) [2021-11-21 00:12:09,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:12:09,075 INFO L93 Difference]: Finished difference Result 102 states and 124 transitions. [2021-11-21 00:12:09,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-21 00:12:09,076 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 2.8333333333333335) internal successors, (51), 19 states have internal predecessors, (51), 10 states have call successors, (31), 3 states have call predecessors, (31), 2 states have return successors, (29), 10 states have call predecessors, (29), 10 states have call successors, (29) Word has length 75 [2021-11-21 00:12:09,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:12:09,078 INFO L225 Difference]: With dead ends: 102 [2021-11-21 00:12:09,078 INFO L226 Difference]: Without dead ends: 100 [2021-11-21 00:12:09,079 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 197 SyntacticMatches, 6 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 742 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=271, Invalid=1891, Unknown=0, NotChecked=0, Total=2162 [2021-11-21 00:12:09,080 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 57 mSDsluCounter, 159 mSDsCounter, 0 mSdLazyCounter, 377 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 472 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 377 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:12:09,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 174 Invalid, 472 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 377 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:12:09,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-21 00:12:09,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 90. [2021-11-21 00:12:09,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 55 states have (on average 1.0909090909090908) internal successors, (60), 58 states have internal predecessors, (60), 24 states have call successors, (24), 10 states have call predecessors, (24), 10 states have return successors, (23), 21 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-21 00:12:09,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 107 transitions. [2021-11-21 00:12:09,091 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 107 transitions. Word has length 75 [2021-11-21 00:12:09,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:12:09,091 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 107 transitions. [2021-11-21 00:12:09,092 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 2.8333333333333335) internal successors, (51), 19 states have internal predecessors, (51), 10 states have call successors, (31), 3 states have call predecessors, (31), 2 states have return successors, (29), 10 states have call predecessors, (29), 10 states have call successors, (29) [2021-11-21 00:12:09,092 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 107 transitions. [2021-11-21 00:12:09,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-21 00:12:09,093 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:12:09,093 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:12:09,117 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:12:09,304 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:12:09,304 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:12:09,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:12:09,305 INFO L85 PathProgramCache]: Analyzing trace with hash -331070875, now seen corresponding path program 2 times [2021-11-21 00:12:09,305 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:12:09,305 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [797802179] [2021-11-21 00:12:09,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:12:09,305 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:12:09,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:12:09,524 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 56 proven. 46 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2021-11-21 00:12:09,525 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:12:09,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [797802179] [2021-11-21 00:12:09,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [797802179] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:12:09,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1565503087] [2021-11-21 00:12:09,525 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:12:09,525 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:12:09,525 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:12:09,532 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:12:09,533 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:12:09,576 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 00:12:09,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:12:09,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 00:12:09,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:12:09,908 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 68 proven. 20 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2021-11-21 00:12:09,908 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:12:10,305 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 68 proven. 20 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2021-11-21 00:12:10,305 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1565503087] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:12:10,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [57675322] [2021-11-21 00:12:10,308 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2021-11-21 00:12:10,308 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:12:10,308 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:12:10,308 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:12:10,309 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:12:18,036 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 00:12:18,103 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:12:19,109 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:12:19,109 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:12:19,109 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 11] total 18 [2021-11-21 00:12:19,109 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482557760] [2021-11-21 00:12:19,112 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:12:19,112 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-21 00:12:19,113 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:12:19,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-21 00:12:19,116 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=1007, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 00:12:19,117 INFO L87 Difference]: Start difference. First operand 90 states and 107 transitions. Second operand has 18 states, 16 states have (on average 2.3125) internal successors, (37), 16 states have internal predecessors, (37), 9 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (23), 10 states have call predecessors, (23), 9 states have call successors, (23) [2021-11-21 00:12:19,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:12:19,513 INFO L93 Difference]: Finished difference Result 90 states and 107 transitions. [2021-11-21 00:12:19,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 00:12:19,516 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 2.3125) internal successors, (37), 16 states have internal predecessors, (37), 9 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (23), 10 states have call predecessors, (23), 9 states have call successors, (23) Word has length 98 [2021-11-21 00:12:19,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:12:19,519 INFO L225 Difference]: With dead ends: 90 [2021-11-21 00:12:19,519 INFO L226 Difference]: Without dead ends: 0 [2021-11-21 00:12:19,521 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 315 GetRequests, 264 SyntacticMatches, 10 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 589 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=197, Invalid=1609, Unknown=0, NotChecked=0, Total=1806 [2021-11-21 00:12:19,522 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 23 mSDsluCounter, 206 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:12:19,523 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 224 Invalid, 269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 225 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:12:19,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-11-21 00:12:19,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-11-21 00:12:19,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 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) [2021-11-21 00:12:19,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-11-21 00:12:19,524 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 98 [2021-11-21 00:12:19,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:12:19,524 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-11-21 00:12:19,524 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 2.3125) internal successors, (37), 16 states have internal predecessors, (37), 9 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (23), 10 states have call predecessors, (23), 9 states have call successors, (23) [2021-11-21 00:12:19,524 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-11-21 00:12:19,524 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-11-21 00:12:19,527 INFO L764 garLoopResultBuilder]: Registering result SAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-21 00:12:19,548 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 00:12:19,730 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-21 00:12:19,732 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-11-21 00:12:20,262 INFO L858 garLoopResultBuilder]: For program point L31(line 31) no Hoare annotation was computed. [2021-11-21 00:12:20,262 INFO L858 garLoopResultBuilder]: For program point L31-1(lines 25 56) no Hoare annotation was computed. [2021-11-21 00:12:20,263 INFO L854 garLoopResultBuilder]: At program point L52(line 52) the Hoare annotation is: (and (let ((.cse0 (<= 2 |ULTIMATE.start_main_~bufferlen~0#1|)) (.cse1 (<= 0 |ULTIMATE.start_main_~buf~0#1|))) (or (and .cse0 .cse1 (= |ULTIMATE.start_main_~in~0#1| 0)) (and .cse0 (<= 1 |ULTIMATE.start_main_~in~0#1|) .cse1))) (<= (+ |ULTIMATE.start_main_~buf~0#1| 1) |ULTIMATE.start_main_~bufferlen~0#1|)) [2021-11-21 00:12:20,263 INFO L854 garLoopResultBuilder]: At program point L52-1(line 52) the Hoare annotation is: (and (let ((.cse0 (<= 2 |ULTIMATE.start_main_~bufferlen~0#1|)) (.cse1 (<= 0 |ULTIMATE.start_main_~buf~0#1|))) (or (and .cse0 .cse1 (= |ULTIMATE.start_main_~in~0#1| 0)) (and .cse0 (<= 1 |ULTIMATE.start_main_~in~0#1|) .cse1))) (<= (+ |ULTIMATE.start_main_~buf~0#1| 1) |ULTIMATE.start_main_~bufferlen~0#1|)) [2021-11-21 00:12:20,263 INFO L858 garLoopResultBuilder]: For program point L32(lines 25 56) no Hoare annotation was computed. [2021-11-21 00:12:20,263 INFO L858 garLoopResultBuilder]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2021-11-21 00:12:20,263 INFO L858 garLoopResultBuilder]: For program point L53(line 53) no Hoare annotation was computed. [2021-11-21 00:12:20,263 INFO L854 garLoopResultBuilder]: At program point L49(line 49) the Hoare annotation is: (let ((.cse1 (<= 1 |ULTIMATE.start_main_~in~0#1|)) (.cse2 (<= (+ |ULTIMATE.start_main_~buf~0#1| 2) |ULTIMATE.start_main_~bufferlen~0#1|)) (.cse3 (<= 0 |ULTIMATE.start_main_~buf~0#1|))) (or (let ((.cse0 (+ 2 |ULTIMATE.start_main_~buflim~0#1|))) (and (<= (+ |ULTIMATE.start_main_~bufferlen~0#1| |ULTIMATE.start_main_~in~0#1| 1) (+ |ULTIMATE.start_main_~buf~0#1| |ULTIMATE.start_main_~inlen~0#1|)) (<= .cse0 |ULTIMATE.start_main_~bufferlen~0#1|) .cse1 (<= |ULTIMATE.start_main_~bufferlen~0#1| .cse0) .cse2 .cse3)) (and .cse1 .cse2 (<= |ULTIMATE.start_main_~buf~0#1| 2) .cse3) (and (<= 2 |ULTIMATE.start_main_~bufferlen~0#1|) (= |ULTIMATE.start_main_~buf~0#1| 0) (= |ULTIMATE.start_main_~in~0#1| 0)))) [2021-11-21 00:12:20,263 INFO L854 garLoopResultBuilder]: At program point L41(line 41) the Hoare annotation is: (let ((.cse0 (+ 2 |ULTIMATE.start_main_~buflim~0#1|))) (or (and (<= (+ |ULTIMATE.start_main_~bufferlen~0#1| |ULTIMATE.start_main_~in~0#1| 1) (+ |ULTIMATE.start_main_~buf~0#1| |ULTIMATE.start_main_~inlen~0#1|)) (<= .cse0 |ULTIMATE.start_main_~bufferlen~0#1|) (<= 1 |ULTIMATE.start_main_~in~0#1|) (<= |ULTIMATE.start_main_~bufferlen~0#1| .cse0) (<= 0 |ULTIMATE.start_main_~buf~0#1|) (<= (+ |ULTIMATE.start_main_~buf~0#1| 3) |ULTIMATE.start_main_~bufferlen~0#1|)) (and (= |ULTIMATE.start_main_~buf~0#1| 0) (< .cse0 |ULTIMATE.start_main_~inlen~0#1|) (= |ULTIMATE.start_main_~bufferlen~0#1| .cse0) (= |ULTIMATE.start_main_~in~0#1| 0) (<= 3 |ULTIMATE.start_main_~bufferlen~0#1|)))) [2021-11-21 00:12:20,263 INFO L854 garLoopResultBuilder]: At program point L41-1(line 41) the Hoare annotation is: (let ((.cse0 (+ 2 |ULTIMATE.start_main_~buflim~0#1|))) (or (and (<= (+ |ULTIMATE.start_main_~bufferlen~0#1| |ULTIMATE.start_main_~in~0#1| 1) (+ |ULTIMATE.start_main_~buf~0#1| |ULTIMATE.start_main_~inlen~0#1|)) (<= .cse0 |ULTIMATE.start_main_~bufferlen~0#1|) (<= 1 |ULTIMATE.start_main_~in~0#1|) (<= |ULTIMATE.start_main_~bufferlen~0#1| .cse0) (<= 0 |ULTIMATE.start_main_~buf~0#1|) (<= (+ |ULTIMATE.start_main_~buf~0#1| 3) |ULTIMATE.start_main_~bufferlen~0#1|)) (and (= |ULTIMATE.start_main_~buf~0#1| 0) (< .cse0 |ULTIMATE.start_main_~inlen~0#1|) (= |ULTIMATE.start_main_~bufferlen~0#1| .cse0) (= |ULTIMATE.start_main_~in~0#1| 0) (<= 3 |ULTIMATE.start_main_~bufferlen~0#1|)))) [2021-11-21 00:12:20,263 INFO L858 garLoopResultBuilder]: For program point L37-1(lines 37 48) no Hoare annotation was computed. [2021-11-21 00:12:20,263 INFO L854 garLoopResultBuilder]: At program point L37-3(lines 37 48) the Hoare annotation is: (let ((.cse1 (<= 1 |ULTIMATE.start_main_~in~0#1|)) (.cse2 (<= (+ |ULTIMATE.start_main_~buf~0#1| 2) |ULTIMATE.start_main_~bufferlen~0#1|)) (.cse3 (<= 0 |ULTIMATE.start_main_~buf~0#1|))) (or (let ((.cse0 (+ 2 |ULTIMATE.start_main_~buflim~0#1|))) (and (<= (+ |ULTIMATE.start_main_~bufferlen~0#1| |ULTIMATE.start_main_~in~0#1| 1) (+ |ULTIMATE.start_main_~buf~0#1| |ULTIMATE.start_main_~inlen~0#1|)) (<= .cse0 |ULTIMATE.start_main_~bufferlen~0#1|) .cse1 (<= |ULTIMATE.start_main_~bufferlen~0#1| .cse0) .cse2 .cse3)) (and .cse1 .cse2 (<= |ULTIMATE.start_main_~buf~0#1| 2) .cse3) (and (<= 2 |ULTIMATE.start_main_~bufferlen~0#1|) (= |ULTIMATE.start_main_~buf~0#1| 0) (= |ULTIMATE.start_main_~in~0#1| 0)))) [2021-11-21 00:12:20,264 INFO L858 garLoopResultBuilder]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-11-21 00:12:20,264 INFO L858 garLoopResultBuilder]: For program point L50(line 50) no Hoare annotation was computed. [2021-11-21 00:12:20,264 INFO L854 garLoopResultBuilder]: At program point L46(line 46) the Hoare annotation is: (let ((.cse0 (+ 2 |ULTIMATE.start_main_~buflim~0#1|))) (and (<= (+ |ULTIMATE.start_main_~bufferlen~0#1| |ULTIMATE.start_main_~in~0#1| 1) (+ |ULTIMATE.start_main_~buf~0#1| |ULTIMATE.start_main_~inlen~0#1|)) (<= .cse0 |ULTIMATE.start_main_~bufferlen~0#1|) (<= 1 |ULTIMATE.start_main_~in~0#1|) (<= |ULTIMATE.start_main_~bufferlen~0#1| .cse0) (<= (+ |ULTIMATE.start_main_~buf~0#1| 2) |ULTIMATE.start_main_~bufferlen~0#1|) (<= 0 |ULTIMATE.start_main_~buf~0#1|))) [2021-11-21 00:12:20,264 INFO L854 garLoopResultBuilder]: At program point L46-1(line 46) the Hoare annotation is: (let ((.cse0 (+ 2 |ULTIMATE.start_main_~buflim~0#1|))) (and (<= (+ |ULTIMATE.start_main_~bufferlen~0#1| |ULTIMATE.start_main_~in~0#1| 1) (+ |ULTIMATE.start_main_~buf~0#1| |ULTIMATE.start_main_~inlen~0#1|)) (<= .cse0 |ULTIMATE.start_main_~bufferlen~0#1|) (<= 1 |ULTIMATE.start_main_~in~0#1|) (<= |ULTIMATE.start_main_~bufferlen~0#1| .cse0) (<= (+ |ULTIMATE.start_main_~buf~0#1| 2) |ULTIMATE.start_main_~bufferlen~0#1|) (<= 0 |ULTIMATE.start_main_~buf~0#1|))) [2021-11-21 00:12:20,264 INFO L858 garLoopResultBuilder]: For program point L42(line 42) no Hoare annotation was computed. [2021-11-21 00:12:20,264 INFO L861 garLoopResultBuilder]: At program point L55(lines 25 56) the Hoare annotation is: true [2021-11-21 00:12:20,264 INFO L854 garLoopResultBuilder]: At program point L47(lines 37 48) the Hoare annotation is: (let ((.cse0 (+ 2 |ULTIMATE.start_main_~buflim~0#1|))) (or (and (< 0 (+ |ULTIMATE.start_main_~buflim~0#1| 1)) (= |ULTIMATE.start_main_~buf~0#1| 0) (< .cse0 |ULTIMATE.start_main_~inlen~0#1|) (= |ULTIMATE.start_main_~bufferlen~0#1| .cse0) (= |ULTIMATE.start_main_~in~0#1| 0)) (and (<= (+ |ULTIMATE.start_main_~bufferlen~0#1| |ULTIMATE.start_main_~in~0#1| 1) (+ |ULTIMATE.start_main_~buf~0#1| |ULTIMATE.start_main_~inlen~0#1|)) (<= .cse0 |ULTIMATE.start_main_~bufferlen~0#1|) (<= 1 |ULTIMATE.start_main_~in~0#1|) (<= |ULTIMATE.start_main_~bufferlen~0#1| .cse0) (<= (+ |ULTIMATE.start_main_~buf~0#1| 2) |ULTIMATE.start_main_~bufferlen~0#1|) (<= 0 |ULTIMATE.start_main_~buf~0#1|)))) [2021-11-21 00:12:20,264 INFO L858 garLoopResultBuilder]: For program point L39(lines 39 40) no Hoare annotation was computed. [2021-11-21 00:12:20,264 INFO L858 garLoopResultBuilder]: For program point L18-2(lines 17 22) no Hoare annotation was computed. [2021-11-21 00:12:20,264 INFO L861 garLoopResultBuilder]: At program point __VERIFIER_assertENTRY(lines 17 22) the Hoare annotation is: true [2021-11-21 00:12:20,264 INFO L858 garLoopResultBuilder]: For program point __VERIFIER_assertEXIT(lines 17 22) no Hoare annotation was computed. [2021-11-21 00:12:20,264 INFO L858 garLoopResultBuilder]: For program point L19(line 19) no Hoare annotation was computed. [2021-11-21 00:12:20,265 INFO L858 garLoopResultBuilder]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 19) no Hoare annotation was computed. [2021-11-21 00:12:20,265 INFO L858 garLoopResultBuilder]: For program point L18(lines 18 20) no Hoare annotation was computed. [2021-11-21 00:12:20,267 INFO L732 BasicCegarLoop]: Path program histogram: [2, 2, 1, 1, 1, 1, 1, 1] [2021-11-21 00:12:20,269 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-21 00:12:20,283 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.11 12:12:20 BoogieIcfgContainer [2021-11-21 00:12:20,283 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-21 00:12:20,284 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-21 00:12:20,284 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-21 00:12:20,284 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-21 00:12:20,284 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:11:38" (3/4) ... [2021-11-21 00:12:20,287 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-11-21 00:12:20,292 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __VERIFIER_assert [2021-11-21 00:12:20,295 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 14 nodes and edges [2021-11-21 00:12:20,296 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2021-11-21 00:12:20,296 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2021-11-21 00:12:20,296 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-11-21 00:12:20,333 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/witness.graphml [2021-11-21 00:12:20,333 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-21 00:12:20,334 INFO L158 Benchmark]: Toolchain (without parser) took 42970.90ms. Allocated memory was 115.3MB in the beginning and 247.5MB in the end (delta: 132.1MB). Free memory was 84.6MB in the beginning and 88.3MB in the end (delta: -3.7MB). Peak memory consumption was 128.9MB. Max. memory is 16.1GB. [2021-11-21 00:12:20,334 INFO L158 Benchmark]: CDTParser took 0.33ms. Allocated memory is still 115.3MB. Free memory is still 68.6MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-21 00:12:20,335 INFO L158 Benchmark]: CACSL2BoogieTranslator took 293.42ms. Allocated memory is still 115.3MB. Free memory was 84.4MB in the beginning and 89.4MB in the end (delta: -5.1MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-21 00:12:20,335 INFO L158 Benchmark]: Boogie Procedure Inliner took 29.81ms. Allocated memory is still 115.3MB. Free memory was 89.4MB in the beginning and 87.9MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-21 00:12:20,336 INFO L158 Benchmark]: Boogie Preprocessor took 30.37ms. Allocated memory is still 115.3MB. Free memory was 87.9MB in the beginning and 86.8MB in the end (delta: 1.0MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-21 00:12:20,336 INFO L158 Benchmark]: RCFGBuilder took 288.02ms. Allocated memory is still 115.3MB. Free memory was 86.8MB in the beginning and 76.8MB in the end (delta: 10.0MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-21 00:12:20,337 INFO L158 Benchmark]: TraceAbstraction took 42273.51ms. Allocated memory was 115.3MB in the beginning and 247.5MB in the end (delta: 132.1MB). Free memory was 76.0MB in the beginning and 90.4MB in the end (delta: -14.4MB). Peak memory consumption was 119.4MB. Max. memory is 16.1GB. [2021-11-21 00:12:20,337 INFO L158 Benchmark]: Witness Printer took 49.56ms. Allocated memory is still 247.5MB. Free memory was 90.4MB in the beginning and 88.3MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-21 00:12:20,339 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.33ms. Allocated memory is still 115.3MB. Free memory is still 68.6MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 293.42ms. Allocated memory is still 115.3MB. Free memory was 84.4MB in the beginning and 89.4MB in the end (delta: -5.1MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 29.81ms. Allocated memory is still 115.3MB. Free memory was 89.4MB in the beginning and 87.9MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 30.37ms. Allocated memory is still 115.3MB. Free memory was 87.9MB in the beginning and 86.8MB in the end (delta: 1.0MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 288.02ms. Allocated memory is still 115.3MB. Free memory was 86.8MB in the beginning and 76.8MB in the end (delta: 10.0MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * TraceAbstraction took 42273.51ms. Allocated memory was 115.3MB in the beginning and 247.5MB in the end (delta: 132.1MB). Free memory was 76.0MB in the beginning and 90.4MB in the end (delta: -14.4MB). Peak memory consumption was 119.4MB. Max. memory is 16.1GB. * Witness Printer took 49.56ms. Allocated memory is still 247.5MB. Free memory was 90.4MB in the beginning and 88.3MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 19]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 26 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 42.2s, OverallIterations: 10, TraceHistogramMax: 16, PathProgramHistogramMax: 2, EmptinessCheckTime: 0.0s, AutomataDifference: 2.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.5s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 318 SdHoareTripleChecker+Valid, 1.2s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 264 mSDsluCounter, 1572 SdHoareTripleChecker+Invalid, 0.9s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 1292 mSDsCounter, 324 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 1266 IncrementalHoareTripleChecker+Invalid, 1590 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 324 mSolverCounterUnsat, 314 mSDtfsCounter, 1266 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 935 GetRequests, 722 SyntacticMatches, 27 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2354 ImplicationChecksByTransitivity, 4.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=90occurred in iteration=9, InterpolantAutomatonStates: 96, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 10 MinimizatonAttempts, 30 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 11 LocationsWithAnnotation, 56 PreInvPairs, 100 NumberOfFragments, 383 HoareAnnotationTreeSize, 56 FomulaSimplifications, 329 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 11 FomulaSimplificationsInter, 1996 FormulaSimplificationTreeSizeReductionInter, 0.5s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 3.5s InterpolantComputationTime, 657 NumberOfCodeBlocks, 620 NumberOfCodeBlocksAsserted, 21 NumberOfCheckSat, 913 ConstructedInterpolants, 0 QuantifiedInterpolants, 3227 SizeOfPredicates, 16 NumberOfNonLiveVariables, 545 ConjunctsInSsa, 46 ConjunctsInUnsatCore, 18 InterpolantComputations, 6 PerfectInterpolantSequences, 2717/2902 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 37]: Loop Invariant Derived loop invariant: ((((0 < buflim + 1 && buf == 0) && 2 + buflim < inlen) && bufferlen == 2 + buflim) && in == 0) || (((((bufferlen + in + 1 <= buf + inlen && 2 + buflim <= bufferlen) && 1 <= in) && bufferlen <= 2 + buflim) && buf + 2 <= bufferlen) && 0 <= buf) - InvariantResult [Line: 25]: Loop Invariant Derived loop invariant: 1 RESULT: Ultimate proved your program to be correct! [2021-11-21 00:12:20,378 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c91d75f-d967-40cb-ba50-d9d4c5c3c6b9/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: TRUE