./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_two_index_05.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_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/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_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_two_index_05.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/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_a54e8a41-4a74-4291-a202-a13a0c2f8d69/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 3fc114fbbcfc36c9c941771d8fca06798b1529d5817554239fb5f8a03a84a489 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:49:48,043 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:49:48,046 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:49:48,097 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:49:48,099 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:49:48,100 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:49:48,102 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:49:48,104 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:49:48,107 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:49:48,108 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:49:48,109 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:49:48,111 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:49:48,112 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:49:48,113 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:49:48,115 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:49:48,117 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:49:48,118 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:49:48,119 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:49:48,122 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:49:48,124 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:49:48,127 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:49:48,128 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:49:48,130 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:49:48,131 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:49:48,135 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:49:48,136 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:49:48,136 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:49:48,138 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:49:48,138 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:49:48,139 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:49:48,140 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:49:48,141 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:49:48,142 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:49:48,143 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:49:48,144 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:49:48,145 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:49:48,146 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:49:48,146 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:49:48,146 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:49:48,148 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:49:48,148 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:49:48,150 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:49:48,179 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:49:48,180 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:49:48,180 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:49:48,180 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:49:48,181 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:49:48,181 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:49:48,182 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:49:48,182 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:49:48,182 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:49:48,183 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:49:48,183 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:49:48,183 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:49:48,184 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:49:48,184 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:49:48,184 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:49:48,184 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:49:48,185 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:49:48,185 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:49:48,186 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:49:48,186 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:49:48,186 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:49:48,187 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:49:48,187 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:49:48,187 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:49:48,188 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:49:48,188 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:49:48,188 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:49:48,188 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:49:48,189 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:49:48,189 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:49:48,189 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:49:48,190 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:49:48,190 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:49:48,190 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:49:48,190 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:49:48,191 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:49:48,191 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:49:48,191 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:49:48,191 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:49:48,191 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:49:48,192 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:49:48,192 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_a54e8a41-4a74-4291-a202-a13a0c2f8d69/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 3fc114fbbcfc36c9c941771d8fca06798b1529d5817554239fb5f8a03a84a489 [2021-11-20 23:49:48,484 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:49:48,515 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:49:48,518 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:49:48,519 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:49:48,521 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:49:48,522 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-examples/standard_two_index_05.i [2021-11-20 23:49:48,593 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/data/d7f71963c/8e1ffb4aa42f44b4b9e20076fcefd901/FLAG45a834c43 [2021-11-20 23:49:49,034 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:49:49,035 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/sv-benchmarks/c/array-examples/standard_two_index_05.i [2021-11-20 23:49:49,042 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/data/d7f71963c/8e1ffb4aa42f44b4b9e20076fcefd901/FLAG45a834c43 [2021-11-20 23:49:49,419 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/data/d7f71963c/8e1ffb4aa42f44b4b9e20076fcefd901 [2021-11-20 23:49:49,422 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:49:49,424 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:49:49,425 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:49:49,426 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:49:49,429 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:49:49,430 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:49:49" (1/1) ... [2021-11-20 23:49:49,431 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7d1a789f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:49, skipping insertion in model container [2021-11-20 23:49:49,432 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:49:49" (1/1) ... [2021-11-20 23:49:49,439 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:49:49,454 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:49:49,645 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_a54e8a41-4a74-4291-a202-a13a0c2f8d69/sv-benchmarks/c/array-examples/standard_two_index_05.i[814,827] [2021-11-20 23:49:49,658 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:49:49,666 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:49:49,679 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_a54e8a41-4a74-4291-a202-a13a0c2f8d69/sv-benchmarks/c/array-examples/standard_two_index_05.i[814,827] [2021-11-20 23:49:49,692 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:49:49,709 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:49:49,710 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:49 WrapperNode [2021-11-20 23:49:49,710 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:49:49,711 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:49:49,711 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:49:49,712 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:49:49,719 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:49" (1/1) ... [2021-11-20 23:49:49,725 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:49" (1/1) ... [2021-11-20 23:49:49,746 INFO L137 Inliner]: procedures = 16, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 59 [2021-11-20 23:49:49,746 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:49:49,747 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:49:49,747 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:49:49,747 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:49:49,756 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:49" (1/1) ... [2021-11-20 23:49:49,756 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:49" (1/1) ... [2021-11-20 23:49:49,758 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:49" (1/1) ... [2021-11-20 23:49:49,758 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:49" (1/1) ... [2021-11-20 23:49:49,763 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:49" (1/1) ... [2021-11-20 23:49:49,767 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:49" (1/1) ... [2021-11-20 23:49:49,768 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:49" (1/1) ... [2021-11-20 23:49:49,769 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:49:49,770 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:49:49,771 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:49:49,771 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:49:49,781 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:49" (1/1) ... [2021-11-20 23:49:49,788 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:49:49,802 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:49,830 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:49:49,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:49:49,882 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:49:49,883 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:49:49,883 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-20 23:49:49,883 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-20 23:49:49,883 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:49:49,883 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:49:49,883 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-20 23:49:49,884 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-20 23:49:49,956 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:49:49,958 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:49:50,143 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:49:50,185 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:49:50,185 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-20 23:49:50,188 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:49:50 BoogieIcfgContainer [2021-11-20 23:49:50,188 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:49:50,190 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:49:50,190 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:49:50,206 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:49:50,207 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:49:49" (1/3) ... [2021-11-20 23:49:50,207 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d155070 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:49:50, skipping insertion in model container [2021-11-20 23:49:50,208 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:49" (2/3) ... [2021-11-20 23:49:50,208 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d155070 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:49:50, skipping insertion in model container [2021-11-20 23:49:50,208 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:49:50" (3/3) ... [2021-11-20 23:49:50,209 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_two_index_05.i [2021-11-20 23:49:50,214 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:49:50,215 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 23:49:50,262 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:49:50,270 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-20 23:49:50,270 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 23:49:50,284 INFO L276 IsEmpty]: Start isEmpty. Operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:49:50,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-20 23:49:50,289 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:50,290 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-20 23:49:50,290 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:50,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:50,309 INFO L85 PathProgramCache]: Analyzing trace with hash -1776518481, now seen corresponding path program 1 times [2021-11-20 23:49:50,321 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:50,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1757421641] [2021-11-20 23:49:50,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:50,334 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:50,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:50,526 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:49:50,526 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:50,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1757421641] [2021-11-20 23:49:50,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1757421641] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:49:50,528 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:49:50,529 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:49:50,530 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1052203158] [2021-11-20 23:49:50,531 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:49:50,536 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:49:50,536 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:50,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:49:50,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:49:50,568 INFO L87 Difference]: Start difference. First operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:49:50,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:50,618 INFO L93 Difference]: Finished difference Result 17 states and 23 transitions. [2021-11-20 23:49:50,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:49:50,622 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-20 23:49:50,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:50,631 INFO L225 Difference]: With dead ends: 17 [2021-11-20 23:49:50,631 INFO L226 Difference]: Without dead ends: 9 [2021-11-20 23:49:50,634 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:49:50,641 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:50,644 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:49:50,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-11-20 23:49:50,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2021-11-20 23:49:50,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:49:50,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2021-11-20 23:49:50,687 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 6 [2021-11-20 23:49:50,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:50,687 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 11 transitions. [2021-11-20 23:49:50,688 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:49:50,688 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 11 transitions. [2021-11-20 23:49:50,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-20 23:49:50,689 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:50,689 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:49:50,690 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:49:50,692 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:50,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:50,698 INFO L85 PathProgramCache]: Analyzing trace with hash -612832272, now seen corresponding path program 1 times [2021-11-20 23:49:50,699 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:50,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [666360533] [2021-11-20 23:49:50,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:50,700 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:50,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:50,752 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:49:50,752 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:50,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [666360533] [2021-11-20 23:49:50,753 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [666360533] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:49:50,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [485878600] [2021-11-20 23:49:50,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:50,753 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:50,753 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:50,755 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:49:50,756 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:49:50,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:50,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:49:50,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:49:50,838 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:49:50,839 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:49:50,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [485878600] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:49:50,839 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:49:50,840 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 4 [2021-11-20 23:49:50,841 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929354157] [2021-11-20 23:49:50,841 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:49:50,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:49:50,842 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:50,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:49:50,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:49:50,843 INFO L87 Difference]: Start difference. First operand 9 states and 11 transitions. Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:49:50,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:50,866 INFO L93 Difference]: Finished difference Result 20 states and 23 transitions. [2021-11-20 23:49:50,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:49:50,866 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-20 23:49:50,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:50,867 INFO L225 Difference]: With dead ends: 20 [2021-11-20 23:49:50,867 INFO L226 Difference]: Without dead ends: 15 [2021-11-20 23:49:50,868 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:49:50,870 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:50,871 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 6 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:49:50,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-20 23:49:50,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 10. [2021-11-20 23:49:50,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:49:50,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2021-11-20 23:49:50,875 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 7 [2021-11-20 23:49:50,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:50,875 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2021-11-20 23:49:50,876 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:49:50,876 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2021-11-20 23:49:50,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-20 23:49:50,876 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:50,877 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:49:50,901 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:49:51,088 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:51,089 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:51,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:51,089 INFO L85 PathProgramCache]: Analyzing trace with hash -1851389444, now seen corresponding path program 1 times [2021-11-20 23:49:51,090 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:51,090 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2118622543] [2021-11-20 23:49:51,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:51,090 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:51,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:51,144 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:49:51,144 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:51,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2118622543] [2021-11-20 23:49:51,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2118622543] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:49:51,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1772467515] [2021-11-20 23:49:51,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:51,145 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:51,145 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:51,151 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:49:51,168 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:49:51,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:51,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:49:51,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:49:51,259 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:49:51,259 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:49:51,316 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:49:51,316 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1772467515] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:49:51,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1732638989] [2021-11-20 23:49:51,347 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-20 23:49:51,348 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:49:51,352 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:49:51,358 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:49:51,359 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:49:51,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:51,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:51,524 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-20 23:49:51,525 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-20 23:49:51,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:51,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:51,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:51,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:51,681 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 23:49:51,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-20 23:49:51,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:51,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:49:52,058 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:52,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:52,068 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:52,086 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:49:52,087 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 234 [2021-11-20 23:49:52,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:49:52,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:52,593 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:49:52,677 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:52,678 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:52,732 INFO L354 Elim1Store]: treesize reduction 125, result has 25.1 percent of original size [2021-11-20 23:49:52,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 65 treesize of output 87 [2021-11-20 23:49:52,941 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-20 23:49:52,942 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:49:53,214 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:49:53,393 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:49:53,393 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:49:53,393 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-20 23:49:53,394 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1116191745] [2021-11-20 23:49:53,394 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:49:53,394 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-20 23:49:53,394 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:53,395 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-20 23:49:53,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2021-11-20 23:49:53,395 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:49:53,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:53,440 INFO L93 Difference]: Finished difference Result 31 states and 38 transitions. [2021-11-20 23:49:53,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:49:53,440 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-20 23:49:53,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:53,441 INFO L225 Difference]: With dead ends: 31 [2021-11-20 23:49:53,441 INFO L226 Difference]: Without dead ends: 24 [2021-11-20 23:49:53,442 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2021-11-20 23:49:53,443 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:53,444 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 12 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:49:53,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-20 23:49:53,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 14. [2021-11-20 23:49:53,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:49:53,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2021-11-20 23:49:53,448 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 8 [2021-11-20 23:49:53,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:53,449 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2021-11-20 23:49:53,449 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:49:53,449 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2021-11-20 23:49:53,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-20 23:49:53,449 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:53,449 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1] [2021-11-20 23:49:53,492 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:49:53,650 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:53,650 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:53,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:53,651 INFO L85 PathProgramCache]: Analyzing trace with hash -1413922641, now seen corresponding path program 2 times [2021-11-20 23:49:53,651 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:53,651 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1114860901] [2021-11-20 23:49:53,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:53,652 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:53,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:53,748 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:49:53,749 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:53,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1114860901] [2021-11-20 23:49:53,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1114860901] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:49:53,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1250344922] [2021-11-20 23:49:53,752 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:49:53,753 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:53,753 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:53,756 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:49:53,757 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:49:53,801 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-20 23:49:53,801 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:49:53,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 23:49:53,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:49:53,830 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:49:53,830 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:49:53,867 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:49:53,868 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1250344922] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:49:53,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [717895564] [2021-11-20 23:49:53,870 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-20 23:49:53,871 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:49:53,871 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:49:53,871 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:49:53,872 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:49:53,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:53,916 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:53,945 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-20 23:49:53,946 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-20 23:49:53,976 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:53,978 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:53,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:53,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:54,018 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 23:49:54,018 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-20 23:49:54,105 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:54,106 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:49:54,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:54,252 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:49:54,275 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:49:54,276 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 236 treesize of output 235 [2021-11-20 23:49:54,707 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:49:54,801 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:54,802 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:49:54,867 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:54,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:54,909 INFO L354 Elim1Store]: treesize reduction 125, result has 25.1 percent of original size [2021-11-20 23:49:54,909 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 65 treesize of output 87 [2021-11-20 23:49:55,043 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-20 23:49:55,044 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:49:55,262 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:49:55,423 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:49:55,424 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:49:55,424 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2021-11-20 23:49:55,424 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953451279] [2021-11-20 23:49:55,424 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:49:55,424 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-20 23:49:55,425 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:55,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-20 23:49:55,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=106, Unknown=0, NotChecked=0, Total=182 [2021-11-20 23:49:55,426 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:49:55,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:55,492 INFO L93 Difference]: Finished difference Result 54 states and 63 transitions. [2021-11-20 23:49:55,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-20 23:49:55,492 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-20 23:49:55,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:55,493 INFO L225 Difference]: With dead ends: 54 [2021-11-20 23:49:55,494 INFO L226 Difference]: Without dead ends: 46 [2021-11-20 23:49:55,494 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=76, Invalid=106, Unknown=0, NotChecked=0, Total=182 [2021-11-20 23:49:55,495 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 44 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:55,496 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 18 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:49:55,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-20 23:49:55,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 20. [2021-11-20 23:49:55,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:49:55,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2021-11-20 23:49:55,501 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 12 [2021-11-20 23:49:55,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:55,502 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2021-11-20 23:49:55,502 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:49:55,502 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2021-11-20 23:49:55,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-20 23:49:55,503 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:55,503 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1] [2021-11-20 23:49:55,536 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:49:55,728 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:55,729 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:55,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:55,729 INFO L85 PathProgramCache]: Analyzing trace with hash 1373793359, now seen corresponding path program 3 times [2021-11-20 23:49:55,729 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:55,730 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [685371988] [2021-11-20 23:49:55,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:55,730 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:55,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:55,826 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-20 23:49:55,826 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:55,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [685371988] [2021-11-20 23:49:55,826 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [685371988] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:49:55,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [358222108] [2021-11-20 23:49:55,827 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:49:55,827 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:55,827 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:55,828 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:49:55,852 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:49:55,882 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:49:55,882 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:49:55,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-20 23:49:55,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:49:55,963 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-20 23:49:55,963 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:49:56,072 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-20 23:49:56,074 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [358222108] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:49:56,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [211891384] [2021-11-20 23:49:56,079 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-20 23:49:56,079 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:49:56,079 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:49:56,080 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:49:56,080 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:49:56,112 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:56,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:56,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:56,144 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 23:49:56,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-20 23:49:56,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:56,173 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:56,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-20 23:49:56,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:56,258 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:49:56,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:56,371 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:49:56,407 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:49:56,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 236 treesize of output 235 [2021-11-20 23:49:56,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:49:56,933 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:56,934 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:49:56,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:57,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:57,044 INFO L354 Elim1Store]: treesize reduction 125, result has 25.1 percent of original size [2021-11-20 23:49:57,045 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 65 treesize of output 87 [2021-11-20 23:49:57,184 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-20 23:49:57,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:49:57,461 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:49:57,636 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:49:57,636 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:49:57,636 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 22 [2021-11-20 23:49:57,636 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957972921] [2021-11-20 23:49:57,636 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:49:57,637 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-20 23:49:57,637 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:57,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-20 23:49:57,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=396, Unknown=0, NotChecked=0, Total=702 [2021-11-20 23:49:57,638 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:49:57,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:57,788 INFO L93 Difference]: Finished difference Result 93 states and 112 transitions. [2021-11-20 23:49:57,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-20 23:49:57,789 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-20 23:49:57,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:57,792 INFO L225 Difference]: With dead ends: 93 [2021-11-20 23:49:57,792 INFO L226 Difference]: Without dead ends: 81 [2021-11-20 23:49:57,793 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=306, Invalid=396, Unknown=0, NotChecked=0, Total=702 [2021-11-20 23:49:57,796 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 79 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:57,796 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 48 Invalid, 147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:49:57,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-11-20 23:49:57,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 36. [2021-11-20 23:49:57,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 35 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:49:57,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2021-11-20 23:49:57,813 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 18 [2021-11-20 23:49:57,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:57,815 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2021-11-20 23:49:57,815 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:49:57,815 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2021-11-20 23:49:57,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-20 23:49:57,817 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:57,817 INFO L514 BasicCegarLoop]: trace histogram [19, 9, 1, 1, 1, 1, 1, 1] [2021-11-20 23:49:57,844 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-20 23:49:58,036 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:58,037 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:58,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:58,037 INFO L85 PathProgramCache]: Analyzing trace with hash 1806525724, now seen corresponding path program 4 times [2021-11-20 23:49:58,037 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:58,037 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1114253420] [2021-11-20 23:49:58,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:58,037 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:58,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:58,236 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-11-20 23:49:58,236 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:58,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1114253420] [2021-11-20 23:49:58,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1114253420] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:49:58,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [77814941] [2021-11-20 23:49:58,237 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:49:58,237 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:58,237 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:58,241 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:49:58,263 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:49:58,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:58,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-20 23:49:58,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:49:58,522 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-20 23:49:58,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:49:58,978 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-20 23:49:58,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [77814941] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:49:58,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1127750362] [2021-11-20 23:49:58,981 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-20 23:49:58,981 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:49:58,982 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:49:58,982 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:49:58,982 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:49:59,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:59,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:59,050 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-20 23:49:59,050 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-20 23:49:59,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:59,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:59,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:59,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:59,105 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 23:49:59,105 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-20 23:49:59,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:59,172 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:49:59,332 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:59,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:59,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:59,346 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:49:59,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 234 [2021-11-20 23:49:59,538 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:49:59,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:59,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:49:59,703 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:59,704 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:59,739 INFO L354 Elim1Store]: treesize reduction 125, result has 25.1 percent of original size [2021-11-20 23:49:59,739 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 65 treesize of output 87 [2021-11-20 23:49:59,847 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-20 23:49:59,848 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:50:00,052 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:50:00,207 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:50:00,207 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:50:00,208 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 21, 21] total 49 [2021-11-20 23:50:00,208 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20421612] [2021-11-20 23:50:00,208 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:50:00,208 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-20 23:50:00,208 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:00,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-20 23:50:00,211 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1332, Invalid=1530, Unknown=0, NotChecked=0, Total=2862 [2021-11-20 23:50:00,211 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 49 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:50:00,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:00,494 INFO L93 Difference]: Finished difference Result 153 states and 188 transitions. [2021-11-20 23:50:00,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-20 23:50:00,495 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-20 23:50:00,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:00,497 INFO L225 Difference]: With dead ends: 153 [2021-11-20 23:50:00,497 INFO L226 Difference]: Without dead ends: 138 [2021-11-20 23:50:00,499 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1557 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1332, Invalid=1530, Unknown=0, NotChecked=0, Total=2862 [2021-11-20 23:50:00,499 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 203 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 227 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 203 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 355 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 227 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:00,500 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [203 Valid, 78 Invalid, 355 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [227 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:50:00,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-11-20 23:50:00,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 68. [2021-11-20 23:50:00,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.044776119402985) internal successors, (70), 67 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:50:00,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2021-11-20 23:50:00,510 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 34 [2021-11-20 23:50:00,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:00,510 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2021-11-20 23:50:00,510 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:50:00,511 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2021-11-20 23:50:00,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-20 23:50:00,513 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:00,513 INFO L514 BasicCegarLoop]: trace histogram [46, 14, 1, 1, 1, 1, 1, 1] [2021-11-20 23:50:00,542 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 23:50:00,730 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-20 23:50:00,730 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:00,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:00,731 INFO L85 PathProgramCache]: Analyzing trace with hash 148264399, now seen corresponding path program 5 times [2021-11-20 23:50:00,731 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:00,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1839269580] [2021-11-20 23:50:00,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:00,731 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:00,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:01,009 INFO L134 CoverageAnalysis]: Checked inductivity of 1186 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2021-11-20 23:50:01,010 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:01,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1839269580] [2021-11-20 23:50:01,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1839269580] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:50:01,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [231593079] [2021-11-20 23:50:01,010 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:50:01,011 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:01,011 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:50:01,012 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:50:01,020 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 23:50:02,553 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-20 23:50:02,554 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:50:02,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-20 23:50:02,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:50:02,702 INFO L134 CoverageAnalysis]: Checked inductivity of 1186 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2021-11-20 23:50:02,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:50:03,079 INFO L134 CoverageAnalysis]: Checked inductivity of 1186 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2021-11-20 23:50:03,079 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [231593079] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:50:03,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [322198947] [2021-11-20 23:50:03,082 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-20 23:50:03,082 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:50:03,082 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:50:03,082 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:50:03,083 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:50:03,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:03,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:03,145 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 23:50:03,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-20 23:50:03,188 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:03,190 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:03,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-20 23:50:03,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:03,272 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:50:03,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:03,370 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:50:03,394 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:50:03,395 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 236 treesize of output 235 [2021-11-20 23:50:03,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:50:03,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:03,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 22 [2021-11-20 23:50:03,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:03,998 INFO L354 Elim1Store]: treesize reduction 131, result has 21.6 percent of original size [2021-11-20 23:50:03,999 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 62 treesize of output 81 [2021-11-20 23:50:04,110 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-20 23:50:04,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:50:04,287 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:50:04,431 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:50:04,431 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:50:04,432 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2021-11-20 23:50:04,432 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205987295] [2021-11-20 23:50:04,432 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:50:04,433 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-20 23:50:04,433 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:04,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-20 23:50:04,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=640, Invalid=766, Unknown=0, NotChecked=0, Total=1406 [2021-11-20 23:50:04,434 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand has 33 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 33 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:50:04,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:04,718 INFO L93 Difference]: Finished difference Result 235 states and 253 transitions. [2021-11-20 23:50:04,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-20 23:50:04,719 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 33 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-20 23:50:04,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:04,721 INFO L225 Difference]: With dead ends: 235 [2021-11-20 23:50:04,721 INFO L226 Difference]: Without dead ends: 230 [2021-11-20 23:50:04,723 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 177 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 328 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=640, Invalid=766, Unknown=0, NotChecked=0, Total=1406 [2021-11-20 23:50:04,723 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 372 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 207 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 372 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 207 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:04,724 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [372 Valid, 90 Invalid, 334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [207 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:50:04,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2021-11-20 23:50:04,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 84. [2021-11-20 23:50:04,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 83 states have (on average 1.036144578313253) internal successors, (86), 83 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:50:04,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2021-11-20 23:50:04,736 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 66 [2021-11-20 23:50:04,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:04,736 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2021-11-20 23:50:04,736 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 33 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:50:04,737 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2021-11-20 23:50:04,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-20 23:50:04,739 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:04,740 INFO L514 BasicCegarLoop]: trace histogram [46, 30, 1, 1, 1, 1, 1, 1] [2021-11-20 23:50:04,779 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 23:50:04,960 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-20 23:50:04,961 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:04,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:04,961 INFO L85 PathProgramCache]: Analyzing trace with hash -812104753, now seen corresponding path program 6 times [2021-11-20 23:50:04,961 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:04,961 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1557111100] [2021-11-20 23:50:04,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:04,962 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:05,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:05,555 INFO L134 CoverageAnalysis]: Checked inductivity of 1546 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2021-11-20 23:50:05,555 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:05,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1557111100] [2021-11-20 23:50:05,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1557111100] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:50:05,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1858368432] [2021-11-20 23:50:05,555 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:50:05,556 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:05,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:50:05,557 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:50:05,580 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 23:50:05,670 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:50:05,670 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:50:05,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 515 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-20 23:50:05,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:50:06,173 INFO L134 CoverageAnalysis]: Checked inductivity of 1546 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2021-11-20 23:50:06,173 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:50:08,352 INFO L134 CoverageAnalysis]: Checked inductivity of 1546 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2021-11-20 23:50:08,352 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1858368432] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:50:08,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1089521828] [2021-11-20 23:50:08,354 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-20 23:50:08,354 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:50:08,354 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:50:08,355 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:50:08,355 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:50:08,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:08,376 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:08,399 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-20 23:50:08,399 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-20 23:50:08,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:08,453 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:08,454 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:08,456 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:08,487 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 23:50:08,487 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-20 23:50:08,575 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:08,579 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:50:08,697 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:08,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:08,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:08,713 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:50:08,714 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 234 [2021-11-20 23:50:08,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:50:09,055 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:09,057 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 22 [2021-11-20 23:50:09,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:09,158 INFO L354 Elim1Store]: treesize reduction 131, result has 21.6 percent of original size [2021-11-20 23:50:09,158 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 62 treesize of output 81 [2021-11-20 23:50:09,282 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-20 23:50:09,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:50:09,483 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:50:09,659 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:50:09,659 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:50:09,659 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 48, 48] total 118 [2021-11-20 23:50:09,659 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616708113] [2021-11-20 23:50:09,659 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:50:09,660 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 118 states [2021-11-20 23:50:09,660 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:09,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2021-11-20 23:50:09,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7266, Invalid=7740, Unknown=0, NotChecked=0, Total=15006 [2021-11-20 23:50:09,669 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand has 118 states, 118 states have (on average 1.1440677966101696) internal successors, (135), 118 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:50:10,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:10,792 INFO L93 Difference]: Finished difference Result 405 states and 488 transitions. [2021-11-20 23:50:10,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2021-11-20 23:50:10,792 INFO L78 Accepts]: Start accepts. Automaton has has 118 states, 118 states have (on average 1.1440677966101696) internal successors, (135), 118 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-20 23:50:10,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:10,795 INFO L225 Difference]: With dead ends: 405 [2021-11-20 23:50:10,795 INFO L226 Difference]: Without dead ends: 369 [2021-11-20 23:50:10,800 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7851 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=7266, Invalid=7740, Unknown=0, NotChecked=0, Total=15006 [2021-11-20 23:50:10,801 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 935 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 683 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 935 SdHoareTripleChecker+Valid, 195 SdHoareTripleChecker+Invalid, 999 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 683 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:10,801 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [935 Valid, 195 Invalid, 999 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [683 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:50:10,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2021-11-20 23:50:10,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 164. [2021-11-20 23:50:10,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 163 states have (on average 1.01840490797546) internal successors, (166), 163 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:50:10,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 166 transitions. [2021-11-20 23:50:10,817 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 166 transitions. Word has length 82 [2021-11-20 23:50:10,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:10,818 INFO L470 AbstractCegarLoop]: Abstraction has 164 states and 166 transitions. [2021-11-20 23:50:10,818 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 118 states, 118 states have (on average 1.1440677966101696) internal successors, (135), 118 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:50:10,819 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 166 transitions. [2021-11-20 23:50:10,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2021-11-20 23:50:10,821 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:10,822 INFO L514 BasicCegarLoop]: trace histogram [115, 41, 1, 1, 1, 1, 1, 1] [2021-11-20 23:50:10,854 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 23:50:11,044 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:11,045 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:11,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:11,045 INFO L85 PathProgramCache]: Analyzing trace with hash 1244140316, now seen corresponding path program 7 times [2021-11-20 23:50:11,045 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:11,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [174804331] [2021-11-20 23:50:11,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:11,046 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:11,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:12,059 INFO L134 CoverageAnalysis]: Checked inductivity of 7531 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 6670 trivial. 0 not checked. [2021-11-20 23:50:12,060 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:12,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [174804331] [2021-11-20 23:50:12,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [174804331] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:50:12,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1737730948] [2021-11-20 23:50:12,060 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:50:12,060 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:12,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:50:12,062 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:50:12,063 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 23:50:12,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:12,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 995 conjuncts, 117 conjunts are in the unsatisfiable core [2021-11-20 23:50:12,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:50:13,629 INFO L134 CoverageAnalysis]: Checked inductivity of 7531 backedges. 0 proven. 6670 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2021-11-20 23:50:13,629 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:50:21,659 INFO L134 CoverageAnalysis]: Checked inductivity of 7531 backedges. 0 proven. 6670 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2021-11-20 23:50:21,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1737730948] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:50:21,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1291137446] [2021-11-20 23:50:21,662 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-20 23:50:21,662 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:50:21,662 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:50:21,663 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:50:21,663 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:50:21,705 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:21,706 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:21,708 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:21,739 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 23:50:21,739 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-20 23:50:21,761 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:21,762 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:21,763 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-20 23:50:21,818 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:21,821 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:50:21,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:21,933 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:50:21,957 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:50:21,957 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 236 treesize of output 235 [2021-11-20 23:50:22,387 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:50:22,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:22,458 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 22 [2021-11-20 23:50:22,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:22,551 INFO L354 Elim1Store]: treesize reduction 131, result has 21.6 percent of original size [2021-11-20 23:50:22,551 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 62 treesize of output 81 [2021-11-20 23:50:22,639 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-20 23:50:22,640 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:50:22,852 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:50:23,051 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:50:23,052 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:50:23,052 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 117, 117] total 254 [2021-11-20 23:50:23,052 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466609224] [2021-11-20 23:50:23,052 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:50:23,053 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 254 states [2021-11-20 23:50:23,053 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:23,062 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 254 interpolants. [2021-11-20 23:50:23,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32902, Invalid=33920, Unknown=0, NotChecked=0, Total=66822 [2021-11-20 23:50:23,074 INFO L87 Difference]: Start difference. First operand 164 states and 166 transitions. Second operand has 254 states, 254 states have (on average 1.1181102362204725) internal successors, (284), 254 states have internal predecessors, (284), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:50:29,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:29,335 INFO L93 Difference]: Finished difference Result 698 states and 862 transitions. [2021-11-20 23:50:29,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 254 states. [2021-11-20 23:50:29,336 INFO L78 Accepts]: Start accepts. Automaton has has 254 states, 254 states have (on average 1.1181102362204725) internal successors, (284), 254 states have internal predecessors, (284), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 162 [2021-11-20 23:50:29,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:29,340 INFO L225 Difference]: With dead ends: 698 [2021-11-20 23:50:29,340 INFO L226 Difference]: Without dead ends: 651 [2021-11-20 23:50:29,347 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 528 GetRequests, 271 SyntacticMatches, 0 SemanticMatches, 257 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38173 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=32902, Invalid=33920, Unknown=0, NotChecked=0, Total=66822 [2021-11-20 23:50:29,348 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 1380 mSDsluCounter, 372 mSDsCounter, 0 mSdLazyCounter, 634 mSolverCounterSat, 1121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1380 SdHoareTripleChecker+Valid, 375 SdHoareTripleChecker+Invalid, 1755 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1121 IncrementalHoareTripleChecker+Valid, 634 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:29,348 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1380 Valid, 375 Invalid, 1755 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1121 Valid, 634 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-20 23:50:29,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 651 states. [2021-11-20 23:50:29,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 651 to 325. [2021-11-20 23:50:29,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 325 states, 324 states have (on average 1.0092592592592593) internal successors, (327), 324 states have internal predecessors, (327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:50:29,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 325 states to 325 states and 327 transitions. [2021-11-20 23:50:29,374 INFO L78 Accepts]: Start accepts. Automaton has 325 states and 327 transitions. Word has length 162 [2021-11-20 23:50:29,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:29,375 INFO L470 AbstractCegarLoop]: Abstraction has 325 states and 327 transitions. [2021-11-20 23:50:29,376 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 254 states, 254 states have (on average 1.1181102362204725) internal successors, (284), 254 states have internal predecessors, (284), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:50:29,376 INFO L276 IsEmpty]: Start isEmpty. Operand 325 states and 327 transitions. [2021-11-20 23:50:29,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 324 [2021-11-20 23:50:29,383 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:29,383 INFO L514 BasicCegarLoop]: trace histogram [251, 66, 1, 1, 1, 1, 1, 1] [2021-11-20 23:50:29,421 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-20 23:50:29,596 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:29,597 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:29,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:29,597 INFO L85 PathProgramCache]: Analyzing trace with hash -810757680, now seen corresponding path program 8 times [2021-11-20 23:50:29,597 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:29,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1395398084] [2021-11-20 23:50:29,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:29,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:29,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:31,848 INFO L134 CoverageAnalysis]: Checked inductivity of 33837 backedges. 0 proven. 2211 refuted. 0 times theorem prover too weak. 31626 trivial. 0 not checked. [2021-11-20 23:50:31,849 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:31,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1395398084] [2021-11-20 23:50:31,849 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1395398084] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:50:31,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1763758449] [2021-11-20 23:50:31,849 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:50:31,850 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:31,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:50:31,855 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:50:31,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a54e8a41-4a74-4291-a202-a13a0c2f8d69/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process