./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_two_index_03.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_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/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_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_two_index_03.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/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_e33140f6-33cd-4a32-857d-423c0bfae188/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 52914d7c178662889d0d1af19e507e51f5067aa3fe7ebdb303f414406fa46b67 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:49:56,951 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:49:56,953 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:49:57,022 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:49:57,024 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:49:57,030 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:49:57,032 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:49:57,036 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:49:57,039 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:49:57,047 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:49:57,048 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:49:57,050 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:49:57,051 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:49:57,054 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:49:57,056 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:49:57,065 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:49:57,068 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:49:57,069 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:49:57,072 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:49:57,079 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:49:57,082 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:49:57,083 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:49:57,087 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:49:57,088 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:49:57,094 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:49:57,094 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:49:57,094 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:49:57,096 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:49:57,097 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:49:57,099 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:49:57,100 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:49:57,101 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:49:57,103 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:49:57,104 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:49:57,106 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:49:57,106 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:49:57,107 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:49:57,107 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:49:57,108 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:49:57,109 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:49:57,109 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:49:57,110 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:49:57,164 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:49:57,165 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:49:57,165 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:49:57,166 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:49:57,167 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:49:57,173 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:49:57,173 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:49:57,173 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:49:57,174 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:49:57,174 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:49:57,175 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:49:57,176 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:49:57,176 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:49:57,176 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:49:57,176 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:49:57,177 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:49:57,177 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:49:57,177 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:49:57,178 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:49:57,178 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:49:57,178 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:49:57,179 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:49:57,179 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:49:57,179 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:49:57,179 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:49:57,180 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:49:57,182 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:49:57,182 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:49:57,182 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:49:57,182 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:49:57,183 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:49:57,183 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:49:57,183 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:49:57,184 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:49:57,184 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:49:57,184 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:49:57,184 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:49:57,185 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:49:57,185 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:49:57,185 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:49:57,185 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:49:57,186 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_e33140f6-33cd-4a32-857d-423c0bfae188/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 52914d7c178662889d0d1af19e507e51f5067aa3fe7ebdb303f414406fa46b67 [2021-11-21 01:49:57,443 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:49:57,480 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:49:57,482 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:49:57,484 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:49:57,484 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:49:57,486 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-examples/standard_two_index_03.i [2021-11-21 01:49:57,561 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/data/876546a9a/1265aa8ff29f49ffb920b09ef50b863c/FLAG65c35f674 [2021-11-21 01:49:58,137 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:49:58,138 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/sv-benchmarks/c/array-examples/standard_two_index_03.i [2021-11-21 01:49:58,148 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/data/876546a9a/1265aa8ff29f49ffb920b09ef50b863c/FLAG65c35f674 [2021-11-21 01:49:58,505 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/data/876546a9a/1265aa8ff29f49ffb920b09ef50b863c [2021-11-21 01:49:58,508 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:49:58,510 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:49:58,513 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:49:58,513 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:49:58,516 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:49:58,517 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:49:58" (1/1) ... [2021-11-21 01:49:58,518 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@44f51dc6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:58, skipping insertion in model container [2021-11-21 01:49:58,519 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:49:58" (1/1) ... [2021-11-21 01:49:58,540 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:49:58,557 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:49:58,741 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_e33140f6-33cd-4a32-857d-423c0bfae188/sv-benchmarks/c/array-examples/standard_two_index_03.i[814,827] [2021-11-21 01:49:58,754 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:49:58,762 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:49:58,773 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_e33140f6-33cd-4a32-857d-423c0bfae188/sv-benchmarks/c/array-examples/standard_two_index_03.i[814,827] [2021-11-21 01:49:58,780 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:49:58,793 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:49:58,794 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:58 WrapperNode [2021-11-21 01:49:58,794 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:49:58,795 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:49:58,795 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:49:58,795 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:49:58,803 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:58" (1/1) ... [2021-11-21 01:49:58,810 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:58" (1/1) ... [2021-11-21 01:49:58,828 INFO L137 Inliner]: procedures = 16, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 59 [2021-11-21 01:49:58,829 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:49:58,830 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:49:58,830 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:49:58,830 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:49:58,838 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:58" (1/1) ... [2021-11-21 01:49:58,839 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:58" (1/1) ... [2021-11-21 01:49:58,841 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:58" (1/1) ... [2021-11-21 01:49:58,841 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:58" (1/1) ... [2021-11-21 01:49:58,846 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:58" (1/1) ... [2021-11-21 01:49:58,850 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:58" (1/1) ... [2021-11-21 01:49:58,851 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:58" (1/1) ... [2021-11-21 01:49:58,853 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:49:58,858 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:49:58,858 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:49:58,858 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:49:58,859 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:58" (1/1) ... [2021-11-21 01:49:58,867 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:49:58,877 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:49:58,904 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:49:58,935 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:49:58,957 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:49:58,957 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:49:58,957 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 01:49:58,957 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 01:49:58,957 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:49:58,957 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:49:58,958 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 01:49:58,958 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 01:49:59,018 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:49:59,021 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:49:59,226 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:49:59,252 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:49:59,252 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-21 01:49:59,254 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:49:59 BoogieIcfgContainer [2021-11-21 01:49:59,254 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:49:59,256 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:49:59,256 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:49:59,278 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:49:59,278 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:49:58" (1/3) ... [2021-11-21 01:49:59,279 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1cf0ed63 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:49:59, skipping insertion in model container [2021-11-21 01:49:59,279 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:58" (2/3) ... [2021-11-21 01:49:59,279 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1cf0ed63 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:49:59, skipping insertion in model container [2021-11-21 01:49:59,280 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:49:59" (3/3) ... [2021-11-21 01:49:59,281 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_two_index_03.i [2021-11-21 01:49:59,286 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:49:59,286 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:49:59,372 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:49:59,379 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 01:49:59,379 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:49:59,393 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) [2021-11-21 01:49:59,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-21 01:49:59,398 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:49:59,398 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-21 01:49:59,399 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:49:59,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:49:59,405 INFO L85 PathProgramCache]: Analyzing trace with hash -1745982706, now seen corresponding path program 1 times [2021-11-21 01:49:59,414 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:49:59,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1325613347] [2021-11-21 01:49:59,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:49:59,416 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:49:59,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:49:59,578 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:49:59,578 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:49:59,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1325613347] [2021-11-21 01:49:59,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1325613347] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:49:59,580 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:49:59,580 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:49:59,582 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492150215] [2021-11-21 01:49:59,583 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:49:59,587 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:49:59,587 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:49:59,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:49:59,615 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:49:59,617 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) [2021-11-21 01:49:59,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:49:59,651 INFO L93 Difference]: Finished difference Result 17 states and 23 transitions. [2021-11-21 01:49:59,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:49:59,653 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 [2021-11-21 01:49:59,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:49:59,661 INFO L225 Difference]: With dead ends: 17 [2021-11-21 01:49:59,661 INFO L226 Difference]: Without dead ends: 9 [2021-11-21 01:49:59,664 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 [2021-11-21 01:49:59,668 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 [2021-11-21 01:49:59,670 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] [2021-11-21 01:49:59,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-11-21 01:49:59,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2021-11-21 01:49:59,699 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) [2021-11-21 01:49:59,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2021-11-21 01:49:59,701 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 6 [2021-11-21 01:49:59,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:49:59,702 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 11 transitions. [2021-11-21 01:49:59,702 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) [2021-11-21 01:49:59,702 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 11 transitions. [2021-11-21 01:49:59,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-21 01:49:59,703 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:49:59,703 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:49:59,704 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:49:59,704 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:49:59,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:49:59,705 INFO L85 PathProgramCache]: Analyzing trace with hash 276578033, now seen corresponding path program 1 times [2021-11-21 01:49:59,706 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:49:59,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1838769813] [2021-11-21 01:49:59,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:49:59,707 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:49:59,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:49:59,749 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:49:59,749 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:49:59,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1838769813] [2021-11-21 01:49:59,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1838769813] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:49:59,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1736492112] [2021-11-21 01:49:59,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:49:59,751 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:49:59,751 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:49:59,753 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:49:59,778 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:49:59,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:49:59,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:49:59,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:49:59,859 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:49:59,860 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:49:59,861 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1736492112] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:49:59,864 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:49:59,864 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 4 [2021-11-21 01:49:59,865 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764141085] [2021-11-21 01:49:59,866 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:49:59,868 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:49:59,868 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:49:59,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:49:59,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:49:59,873 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) [2021-11-21 01:49:59,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:49:59,906 INFO L93 Difference]: Finished difference Result 20 states and 23 transitions. [2021-11-21 01:49:59,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:49:59,907 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 [2021-11-21 01:49:59,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:49:59,909 INFO L225 Difference]: With dead ends: 20 [2021-11-21 01:49:59,909 INFO L226 Difference]: Without dead ends: 15 [2021-11-21 01:49:59,909 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 [2021-11-21 01:49:59,916 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 [2021-11-21 01:49:59,917 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] [2021-11-21 01:49:59,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-21 01:49:59,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 10. [2021-11-21 01:49:59,923 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) [2021-11-21 01:49:59,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2021-11-21 01:49:59,924 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 7 [2021-11-21 01:49:59,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:49:59,925 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2021-11-21 01:49:59,925 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) [2021-11-21 01:49:59,926 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2021-11-21 01:49:59,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-21 01:49:59,926 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:49:59,926 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:49:59,964 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:00,141 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:00,141 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:00,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:00,142 INFO L85 PathProgramCache]: Analyzing trace with hash -51261225, now seen corresponding path program 1 times [2021-11-21 01:50:00,142 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:00,142 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404928634] [2021-11-21 01:50:00,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:00,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:00,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:00,200 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:50:00,200 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:00,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404928634] [2021-11-21 01:50:00,201 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [404928634] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:00,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [674754646] [2021-11-21 01:50:00,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:00,203 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:00,204 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:00,205 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:00,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:50:00,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:00,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 01:50:00,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:00,335 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:50:00,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:50:00,416 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:50:00,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [674754646] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:50:00,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [255239834] [2021-11-21 01:50:00,456 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:50:00,471 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:50:00,489 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:50:00,495 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:50:00,495 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:50:00,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:00,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:00,686 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-21 01:50:00,687 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 [2021-11-21 01:50:00,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:00,745 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:00,747 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:00,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:00,789 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:50:00,790 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 [2021-11-21 01:50:00,902 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:00,904 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 [2021-11-21 01:50:01,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:01,107 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:01,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:01,126 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:50:01,126 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 [2021-11-21 01:50:01,445 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 [2021-11-21 01:50:01,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:01,574 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 [2021-11-21 01:50:01,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:01,728 INFO L354 Elim1Store]: treesize reduction 131, result has 21.6 percent of original size [2021-11-21 01:50:01,728 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 [2021-11-21 01:50:01,868 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-21 01:50:01,869 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 [2021-11-21 01:50:02,114 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:50:02,312 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:50:02,312 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:50:02,312 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-21 01:50:02,313 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379503977] [2021-11-21 01:50:02,313 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:50:02,314 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 01:50:02,314 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:02,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 01:50:02,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2021-11-21 01:50:02,316 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) [2021-11-21 01:50:02,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:02,361 INFO L93 Difference]: Finished difference Result 31 states and 38 transitions. [2021-11-21 01:50:02,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:50:02,361 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 [2021-11-21 01:50:02,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:02,362 INFO L225 Difference]: With dead ends: 31 [2021-11-21 01:50:02,362 INFO L226 Difference]: Without dead ends: 24 [2021-11-21 01:50:02,364 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2021-11-21 01:50:02,372 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 [2021-11-21 01:50:02,373 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] [2021-11-21 01:50:02,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-21 01:50:02,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 14. [2021-11-21 01:50:02,377 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) [2021-11-21 01:50:02,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2021-11-21 01:50:02,377 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 8 [2021-11-21 01:50:02,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:02,378 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2021-11-21 01:50:02,378 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) [2021-11-21 01:50:02,378 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2021-11-21 01:50:02,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-21 01:50:02,379 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:02,379 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1] [2021-11-21 01:50:02,417 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:02,594 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:02,595 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:02,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:02,595 INFO L85 PathProgramCache]: Analyzing trace with hash 490227022, now seen corresponding path program 2 times [2021-11-21 01:50:02,595 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:02,595 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [582458134] [2021-11-21 01:50:02,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:02,596 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:02,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:02,668 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-21 01:50:02,669 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:02,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [582458134] [2021-11-21 01:50:02,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [582458134] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:02,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [106185871] [2021-11-21 01:50:02,669 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:50:02,669 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:02,670 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:02,683 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:02,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:50:02,725 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 01:50:02,726 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:50:02,727 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:50:02,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:02,758 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-21 01:50:02,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:50:02,796 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-21 01:50:02,797 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [106185871] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:50:02,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1120161562] [2021-11-21 01:50:02,811 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:50:02,811 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:50:02,811 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:50:02,812 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:50:02,812 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:50:02,841 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:02,842 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:02,868 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-21 01:50:02,869 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 [2021-11-21 01:50:02,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:02,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:02,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:02,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:02,948 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:50:02,948 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 [2021-11-21 01:50:03,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:03,035 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 [2021-11-21 01:50:03,189 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:03,190 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:50:03,216 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:50:03,217 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 [2021-11-21 01:50:03,668 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 [2021-11-21 01:50:03,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:03,749 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 [2021-11-21 01:50:03,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:03,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:03,870 INFO L354 Elim1Store]: treesize reduction 125, result has 25.1 percent of original size [2021-11-21 01:50:03,870 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 [2021-11-21 01:50:03,974 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-21 01:50:03,974 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 [2021-11-21 01:50:04,228 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:50:04,493 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:50:04,494 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:50:04,494 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2021-11-21 01:50:04,494 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918380837] [2021-11-21 01:50:04,494 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:50:04,494 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 01:50:04,495 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:04,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 01:50:04,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=106, Unknown=0, NotChecked=0, Total=182 [2021-11-21 01:50:04,495 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) [2021-11-21 01:50:04,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:04,557 INFO L93 Difference]: Finished difference Result 54 states and 63 transitions. [2021-11-21 01:50:04,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-21 01:50:04,557 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 [2021-11-21 01:50:04,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:04,559 INFO L225 Difference]: With dead ends: 54 [2021-11-21 01:50:04,559 INFO L226 Difference]: Without dead ends: 46 [2021-11-21 01:50:04,559 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=76, Invalid=106, Unknown=0, NotChecked=0, Total=182 [2021-11-21 01:50:04,560 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, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:04,560 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 18 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:50:04,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-21 01:50:04,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 20. [2021-11-21 01:50:04,564 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) [2021-11-21 01:50:04,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2021-11-21 01:50:04,565 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 12 [2021-11-21 01:50:04,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:04,565 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2021-11-21 01:50:04,565 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) [2021-11-21 01:50:04,566 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2021-11-21 01:50:04,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-21 01:50:04,566 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:04,566 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1] [2021-11-21 01:50:04,595 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:04,767 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:04,767 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:04,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:04,767 INFO L85 PathProgramCache]: Analyzing trace with hash 1077845166, now seen corresponding path program 3 times [2021-11-21 01:50:04,768 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:04,768 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2051026744] [2021-11-21 01:50:04,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:04,768 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:04,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:04,918 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 01:50:04,919 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:04,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2051026744] [2021-11-21 01:50:04,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2051026744] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:04,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1602790536] [2021-11-21 01:50:04,920 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:50:04,920 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:04,921 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:04,922 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:04,942 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:50:04,975 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:50:04,975 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:50:04,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 01:50:04,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:05,053 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 01:50:05,053 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:50:05,170 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 01:50:05,170 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1602790536] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:50:05,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1520358789] [2021-11-21 01:50:05,172 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:50:05,172 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:50:05,173 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:50:05,173 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:50:05,173 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:50:05,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:05,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:05,204 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:05,236 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:50:05,236 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 [2021-11-21 01:50:05,265 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:05,266 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:05,268 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 [2021-11-21 01:50:05,349 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:05,350 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 [2021-11-21 01:50:05,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:05,485 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:50:05,507 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:50:05,507 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 [2021-11-21 01:50:05,964 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 [2021-11-21 01:50:06,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:06,068 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 [2021-11-21 01:50:06,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:06,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:06,174 INFO L354 Elim1Store]: treesize reduction 125, result has 25.1 percent of original size [2021-11-21 01:50:06,174 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 [2021-11-21 01:50:06,243 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-21 01:50:06,243 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 [2021-11-21 01:50:06,529 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:50:06,709 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:50:06,709 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:50:06,710 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 22 [2021-11-21 01:50:06,710 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1171485138] [2021-11-21 01:50:06,710 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:50:06,710 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-21 01:50:06,710 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:06,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-21 01:50:06,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=396, Unknown=0, NotChecked=0, Total=702 [2021-11-21 01:50:06,712 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) [2021-11-21 01:50:06,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:06,867 INFO L93 Difference]: Finished difference Result 95 states and 115 transitions. [2021-11-21 01:50:06,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-21 01:50:06,867 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 [2021-11-21 01:50:06,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:06,873 INFO L225 Difference]: With dead ends: 95 [2021-11-21 01:50:06,873 INFO L226 Difference]: Without dead ends: 83 [2021-11-21 01:50:06,875 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=306, Invalid=396, Unknown=0, NotChecked=0, Total=702 [2021-11-21 01:50:06,877 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 84 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:06,878 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 51 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:50:06,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-21 01:50:06,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 37. [2021-11-21 01:50:06,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 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) [2021-11-21 01:50:06,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2021-11-21 01:50:06,888 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 18 [2021-11-21 01:50:06,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:06,888 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2021-11-21 01:50:06,889 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) [2021-11-21 01:50:06,889 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2021-11-21 01:50:06,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-21 01:50:06,890 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:06,890 INFO L514 BasicCegarLoop]: trace histogram [19, 10, 1, 1, 1, 1, 1, 1] [2021-11-21 01:50:06,931 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:07,090 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:07,091 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:07,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:07,091 INFO L85 PathProgramCache]: Analyzing trace with hash 579941201, now seen corresponding path program 4 times [2021-11-21 01:50:07,091 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:07,091 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [426615024] [2021-11-21 01:50:07,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:07,091 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:07,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:07,278 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-11-21 01:50:07,278 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:07,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [426615024] [2021-11-21 01:50:07,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [426615024] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:07,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [912645243] [2021-11-21 01:50:07,278 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:50:07,279 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:07,279 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:07,283 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:07,302 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:50:07,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:07,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-21 01:50:07,353 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:07,530 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-21 01:50:07,530 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:50:07,992 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-21 01:50:07,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [912645243] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:50:07,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [147059914] [2021-11-21 01:50:07,994 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:50:07,994 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:50:07,995 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:50:07,995 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:50:07,995 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:50:08,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:08,033 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:08,061 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-21 01:50:08,062 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 [2021-11-21 01:50:08,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:08,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:08,091 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:08,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:08,127 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:50:08,128 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 [2021-11-21 01:50:08,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:08,218 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 [2021-11-21 01:50:08,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:08,337 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:50:08,355 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:50:08,355 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 [2021-11-21 01:50:08,695 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 [2021-11-21 01:50:08,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:08,810 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 [2021-11-21 01:50:08,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:08,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:08,922 INFO L354 Elim1Store]: treesize reduction 125, result has 25.1 percent of original size [2021-11-21 01:50:08,922 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 [2021-11-21 01:50:09,016 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-21 01:50:09,016 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 [2021-11-21 01:50:09,243 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:50:09,434 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:50:09,434 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:50:09,434 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21, 21] total 47 [2021-11-21 01:50:09,434 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604674225] [2021-11-21 01:50:09,435 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:50:09,435 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-21 01:50:09,435 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:09,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-21 01:50:09,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1231, Invalid=1421, Unknown=0, NotChecked=0, Total=2652 [2021-11-21 01:50:09,438 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 47 states, 47 states have (on average 1.297872340425532) internal successors, (61), 47 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:09,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:09,756 INFO L93 Difference]: Finished difference Result 176 states and 212 transitions. [2021-11-21 01:50:09,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-21 01:50:09,756 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.297872340425532) internal successors, (61), 47 states have internal predecessors, (61), 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 35 [2021-11-21 01:50:09,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:09,758 INFO L225 Difference]: With dead ends: 176 [2021-11-21 01:50:09,758 INFO L226 Difference]: Without dead ends: 160 [2021-11-21 01:50:09,760 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1325 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1231, Invalid=1421, Unknown=0, NotChecked=0, Total=2652 [2021-11-21 01:50:09,761 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 299 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 244 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 299 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 381 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 244 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:09,761 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [299 Valid, 87 Invalid, 381 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [244 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:50:09,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-11-21 01:50:09,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 70. [2021-11-21 01:50:09,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.0434782608695652) internal successors, (72), 69 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:09,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2021-11-21 01:50:09,772 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 35 [2021-11-21 01:50:09,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:09,772 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2021-11-21 01:50:09,772 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.297872340425532) internal successors, (61), 47 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:09,772 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2021-11-21 01:50:09,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-21 01:50:09,775 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:09,775 INFO L514 BasicCegarLoop]: trace histogram [44, 18, 1, 1, 1, 1, 1, 1] [2021-11-21 01:50:09,812 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:09,999 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-21 01:50:09,999 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:09,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:10,000 INFO L85 PathProgramCache]: Analyzing trace with hash 583456974, now seen corresponding path program 5 times [2021-11-21 01:50:10,000 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:10,000 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1195018939] [2021-11-21 01:50:10,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:10,000 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:10,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:10,390 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2021-11-21 01:50:10,390 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:10,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1195018939] [2021-11-21 01:50:10,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1195018939] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:10,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1900588872] [2021-11-21 01:50:10,390 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:50:10,391 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:10,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:10,392 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:10,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:50:18,635 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-21 01:50:18,635 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:50:18,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-21 01:50:18,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:18,812 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2021-11-21 01:50:18,812 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:50:19,418 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2021-11-21 01:50:19,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1900588872] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:50:19,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [734193901] [2021-11-21 01:50:19,421 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:50:19,421 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:50:19,421 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:50:19,422 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:50:19,422 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:50:19,455 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:19,456 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:19,480 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-21 01:50:19,480 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 [2021-11-21 01:50:19,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:19,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:19,542 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:50:19,542 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 [2021-11-21 01:50:19,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:19,657 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 [2021-11-21 01:50:19,745 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:19,746 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:50:19,770 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:50:19,771 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 [2021-11-21 01:50:20,186 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 [2021-11-21 01:50:20,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:20,245 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 [2021-11-21 01:50:20,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:20,343 INFO L354 Elim1Store]: treesize reduction 131, result has 21.6 percent of original size [2021-11-21 01:50:20,343 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 [2021-11-21 01:50:20,443 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-21 01:50:20,443 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 [2021-11-21 01:50:20,689 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:50:20,871 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:50:20,871 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:50:20,872 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 41 [2021-11-21 01:50:20,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [920162979] [2021-11-21 01:50:20,872 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:50:20,873 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-21 01:50:20,873 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:20,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-21 01:50:20,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=956, Invalid=1114, Unknown=0, NotChecked=0, Total=2070 [2021-11-21 01:50:20,875 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand has 41 states, 41 states have (on average 1.146341463414634) internal successors, (47), 41 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:21,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:21,255 INFO L93 Difference]: Finished difference Result 281 states and 303 transitions. [2021-11-21 01:50:21,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-21 01:50:21,255 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.146341463414634) internal successors, (47), 41 states have internal predecessors, (47), 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 68 [2021-11-21 01:50:21,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:21,258 INFO L225 Difference]: With dead ends: 281 [2021-11-21 01:50:21,258 INFO L226 Difference]: Without dead ends: 276 [2021-11-21 01:50:21,259 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 179 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=956, Invalid=1114, Unknown=0, NotChecked=0, Total=2070 [2021-11-21 01:50:21,260 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 392 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 159 mSolverCounterSat, 217 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 392 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 376 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 217 IncrementalHoareTripleChecker+Valid, 159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:21,260 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [392 Valid, 114 Invalid, 376 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [217 Valid, 159 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:50:21,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2021-11-21 01:50:21,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 90. [2021-11-21 01:50:21,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 89 states have (on average 1.0337078651685394) internal successors, (92), 89 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:21,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2021-11-21 01:50:21,273 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 68 [2021-11-21 01:50:21,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:21,274 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2021-11-21 01:50:21,274 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.146341463414634) internal successors, (47), 41 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:21,274 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2021-11-21 01:50:21,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-21 01:50:21,277 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:21,277 INFO L514 BasicCegarLoop]: trace histogram [44, 38, 1, 1, 1, 1, 1, 1] [2021-11-21 01:50:21,316 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:21,478 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-21 01:50:21,478 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:21,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:21,478 INFO L85 PathProgramCache]: Analyzing trace with hash 850278350, now seen corresponding path program 6 times [2021-11-21 01:50:21,478 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:21,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387293048] [2021-11-21 01:50:21,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:21,479 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:21,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:22,300 INFO L134 CoverageAnalysis]: Checked inductivity of 1731 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2021-11-21 01:50:22,300 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:22,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [387293048] [2021-11-21 01:50:22,300 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [387293048] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:22,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1390867700] [2021-11-21 01:50:22,301 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:50:22,301 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:22,301 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:22,313 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:22,314 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:50:22,432 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:50:22,432 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:50:22,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 551 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-21 01:50:22,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:22,922 INFO L134 CoverageAnalysis]: Checked inductivity of 1731 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2021-11-21 01:50:22,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:50:25,296 INFO L134 CoverageAnalysis]: Checked inductivity of 1731 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2021-11-21 01:50:25,296 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1390867700] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:50:25,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2018614691] [2021-11-21 01:50:25,298 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:50:25,298 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:50:25,299 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:50:25,299 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:50:25,299 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:50:25,323 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:25,324 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:25,350 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-21 01:50:25,351 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 [2021-11-21 01:50:25,393 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:25,394 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:25,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:25,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:25,429 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:50:25,429 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 [2021-11-21 01:50:25,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:25,519 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 [2021-11-21 01:50:25,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:25,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:25,595 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:25,608 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:50:25,608 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 [2021-11-21 01:50:25,866 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 [2021-11-21 01:50:25,947 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:25,948 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 [2021-11-21 01:50:26,019 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:26,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:26,059 INFO L354 Elim1Store]: treesize reduction 125, result has 25.1 percent of original size [2021-11-21 01:50:26,059 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 [2021-11-21 01:50:26,144 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-21 01:50:26,145 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 [2021-11-21 01:50:26,372 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:50:26,578 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:50:26,578 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:50:26,578 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 46, 46] total 117 [2021-11-21 01:50:26,579 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681756569] [2021-11-21 01:50:26,579 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:50:26,579 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 117 states [2021-11-21 01:50:26,579 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:26,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 117 interpolants. [2021-11-21 01:50:26,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7146, Invalid=7616, Unknown=0, NotChecked=0, Total=14762 [2021-11-21 01:50:26,589 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand has 117 states, 117 states have (on average 1.188034188034188) internal successors, (139), 117 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:28,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:28,246 INFO L93 Difference]: Finished difference Result 490 states and 579 transitions. [2021-11-21 01:50:28,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2021-11-21 01:50:28,247 INFO L78 Accepts]: Start accepts. Automaton has has 117 states, 117 states have (on average 1.188034188034188) internal successors, (139), 117 states have internal predecessors, (139), 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 88 [2021-11-21 01:50:28,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:28,249 INFO L225 Difference]: With dead ends: 490 [2021-11-21 01:50:28,249 INFO L226 Difference]: Without dead ends: 446 [2021-11-21 01:50:28,254 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 183 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6641 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=7146, Invalid=7616, Unknown=0, NotChecked=0, Total=14762 [2021-11-21 01:50:28,254 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 1007 mSDsluCounter, 216 mSDsCounter, 0 mSdLazyCounter, 341 mSolverCounterSat, 751 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1007 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 1092 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 751 IncrementalHoareTripleChecker+Valid, 341 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:28,255 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1007 Valid, 219 Invalid, 1092 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [751 Valid, 341 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 01:50:28,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 446 states. [2021-11-21 01:50:28,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 446 to 176. [2021-11-21 01:50:28,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 175 states have (on average 1.0171428571428571) internal successors, (178), 175 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:28,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 178 transitions. [2021-11-21 01:50:28,272 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 178 transitions. Word has length 88 [2021-11-21 01:50:28,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:28,272 INFO L470 AbstractCegarLoop]: Abstraction has 176 states and 178 transitions. [2021-11-21 01:50:28,273 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 117 states, 117 states have (on average 1.188034188034188) internal successors, (139), 117 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:28,273 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 178 transitions. [2021-11-21 01:50:28,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-11-21 01:50:28,276 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:28,276 INFO L514 BasicCegarLoop]: trace histogram [114, 54, 1, 1, 1, 1, 1, 1] [2021-11-21 01:50:28,314 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:28,491 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:28,491 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:28,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:28,492 INFO L85 PathProgramCache]: Analyzing trace with hash 1333589230, now seen corresponding path program 7 times [2021-11-21 01:50:28,492 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:28,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1277694188] [2021-11-21 01:50:28,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:28,492 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:28,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:29,890 INFO L134 CoverageAnalysis]: Checked inductivity of 8040 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 6555 trivial. 0 not checked. [2021-11-21 01:50:29,890 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:29,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1277694188] [2021-11-21 01:50:29,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1277694188] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:29,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1830771730] [2021-11-21 01:50:29,891 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:50:29,891 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:29,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:29,892 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:29,892 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:50:30,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:30,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 1067 conjuncts, 116 conjunts are in the unsatisfiable core [2021-11-21 01:50:30,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:31,723 INFO L134 CoverageAnalysis]: Checked inductivity of 8040 backedges. 0 proven. 6555 refuted. 0 times theorem prover too weak. 1485 trivial. 0 not checked. [2021-11-21 01:50:31,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:50:40,318 INFO L134 CoverageAnalysis]: Checked inductivity of 8040 backedges. 0 proven. 6555 refuted. 0 times theorem prover too weak. 1485 trivial. 0 not checked. [2021-11-21 01:50:40,319 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1830771730] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:50:40,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [760768059] [2021-11-21 01:50:40,322 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:50:40,322 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:50:40,322 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:50:40,322 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:50:40,323 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:50:40,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:40,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:40,388 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-21 01:50:40,388 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 [2021-11-21 01:50:40,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:40,417 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:40,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:40,455 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:50:40,456 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 [2021-11-21 01:50:40,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:40,557 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 [2021-11-21 01:50:40,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:40,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:40,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:40,663 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:50:40,663 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 [2021-11-21 01:50:40,931 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 [2021-11-21 01:50:41,003 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:41,004 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 [2021-11-21 01:50:41,047 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:41,087 INFO L354 Elim1Store]: treesize reduction 131, result has 21.6 percent of original size [2021-11-21 01:50:41,088 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 [2021-11-21 01:50:41,173 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-21 01:50:41,174 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 [2021-11-21 01:50:41,353 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:50:41,536 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:50:41,537 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:50:41,538 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 116, 116] total 250 [2021-11-21 01:50:41,538 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589160772] [2021-11-21 01:50:41,538 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:50:41,539 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 250 states [2021-11-21 01:50:41,539 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:41,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 250 interpolants. [2021-11-21 01:50:41,556 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31884, Invalid=32886, Unknown=0, NotChecked=0, Total=64770 [2021-11-21 01:50:41,557 INFO L87 Difference]: Start difference. First operand 176 states and 178 transitions. Second operand has 250 states, 250 states have (on average 1.18) internal successors, (295), 250 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:51,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:51,739 INFO L93 Difference]: Finished difference Result 875 states and 1051 transitions. [2021-11-21 01:50:51,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 250 states. [2021-11-21 01:50:51,740 INFO L78 Accepts]: Start accepts. Automaton has has 250 states, 250 states have (on average 1.18) internal successors, (295), 250 states have internal predecessors, (295), 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 174 [2021-11-21 01:50:51,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:51,745 INFO L225 Difference]: With dead ends: 875 [2021-11-21 01:50:51,745 INFO L226 Difference]: Without dead ends: 815 [2021-11-21 01:50:51,750 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 577 GetRequests, 324 SyntacticMatches, 0 SemanticMatches, 253 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31671 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=31884, Invalid=32886, Unknown=0, NotChecked=0, Total=64770 [2021-11-21 01:50:51,751 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 1644 mSDsluCounter, 483 mSDsCounter, 0 mSdLazyCounter, 741 mSolverCounterSat, 1135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1644 SdHoareTripleChecker+Valid, 486 SdHoareTripleChecker+Invalid, 1876 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1135 IncrementalHoareTripleChecker+Valid, 741 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:51,751 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1644 Valid, 486 Invalid, 1876 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1135 Valid, 741 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-21 01:50:51,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 815 states. [2021-11-21 01:50:51,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 815 to 349. [2021-11-21 01:50:51,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 348 states have (on average 1.0086206896551724) internal successors, (351), 348 states have internal predecessors, (351), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:51,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 351 transitions. [2021-11-21 01:50:51,778 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 351 transitions. Word has length 174 [2021-11-21 01:50:51,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:51,779 INFO L470 AbstractCegarLoop]: Abstraction has 349 states and 351 transitions. [2021-11-21 01:50:51,779 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 250 states, 250 states have (on average 1.18) internal successors, (295), 250 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:51,780 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 351 transitions. [2021-11-21 01:50:51,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 348 [2021-11-21 01:50:51,785 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:51,785 INFO L514 BasicCegarLoop]: trace histogram [247, 94, 1, 1, 1, 1, 1, 1] [2021-11-21 01:50:51,820 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:51,999 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:51,999 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:52,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:52,000 INFO L85 PathProgramCache]: Analyzing trace with hash 751998993, now seen corresponding path program 8 times [2021-11-21 01:50:52,000 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:52,000 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [5771636] [2021-11-21 01:50:52,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:52,000 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:52,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:55,846 INFO L134 CoverageAnalysis]: Checked inductivity of 35093 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 30628 trivial. 0 not checked. [2021-11-21 01:50:55,846 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:55,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [5771636] [2021-11-21 01:50:55,846 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [5771636] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:55,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1474719641] [2021-11-21 01:50:55,847 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:50:55,847 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:55,847 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:55,848 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:55,849 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e33140f6-33cd-4a32-857d-423c0bfae188/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process