./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-industry-pattern/check_removal_from_set_after_insertion.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/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_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-industry-pattern/check_removal_from_set_after_insertion.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/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_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/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 07a8b8b198dffd8285677bd0bfdd16b4d1f780e3a9696ef3e27a077e8ff12a49 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:39:14,949 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:39:14,952 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:39:15,019 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:39:15,020 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:39:15,025 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:39:15,027 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:39:15,032 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:39:15,035 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:39:15,043 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:39:15,044 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:39:15,047 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:39:15,048 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:39:15,051 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:39:15,053 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:39:15,059 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:39:15,061 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:39:15,062 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:39:15,065 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:39:15,074 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:39:15,077 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:39:15,079 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:39:15,083 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:39:15,084 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:39:15,095 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:39:15,095 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:39:15,096 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:39:15,098 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:39:15,099 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:39:15,101 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:39:15,101 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:39:15,102 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:39:15,105 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:39:15,106 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:39:15,108 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:39:15,108 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:39:15,109 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:39:15,109 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:39:15,109 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:39:15,110 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:39:15,111 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:39:15,112 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:39:15,165 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:39:15,166 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:39:15,167 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:39:15,167 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:39:15,175 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:39:15,175 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:39:15,176 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:39:15,176 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:39:15,176 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:39:15,176 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:39:15,178 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:39:15,178 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:39:15,178 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:39:15,178 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:39:15,179 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:39:15,179 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:39:15,179 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:39:15,180 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:39:15,180 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:39:15,181 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:39:15,181 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:39:15,181 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:39:15,182 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:39:15,182 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:39:15,182 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:39:15,182 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:39:15,184 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:39:15,185 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:39:15,185 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:39:15,185 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:39:15,185 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:39:15,186 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:39:15,186 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:39:15,187 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:39:15,187 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:39:15,187 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:39:15,187 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:39:15,188 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:39:15,188 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:39:15,188 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:39:15,188 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:39:15,189 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_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 07a8b8b198dffd8285677bd0bfdd16b4d1f780e3a9696ef3e27a077e8ff12a49 [2021-11-21 01:39:15,553 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:39:15,583 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:39:15,587 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:39:15,589 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:39:15,590 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:39:15,592 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-industry-pattern/check_removal_from_set_after_insertion.c [2021-11-21 01:39:15,663 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/data/eaa5da930/55ad3cd7467946499ec7199e18f9e808/FLAG52a434ffc [2021-11-21 01:39:16,158 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:39:16,159 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/sv-benchmarks/c/array-industry-pattern/check_removal_from_set_after_insertion.c [2021-11-21 01:39:16,171 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/data/eaa5da930/55ad3cd7467946499ec7199e18f9e808/FLAG52a434ffc [2021-11-21 01:39:16,544 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/data/eaa5da930/55ad3cd7467946499ec7199e18f9e808 [2021-11-21 01:39:16,549 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:39:16,551 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:39:16,556 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:39:16,557 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:39:16,561 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:39:16,562 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:39:16" (1/1) ... [2021-11-21 01:39:16,564 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@61ab445a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:39:16, skipping insertion in model container [2021-11-21 01:39:16,565 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:39:16" (1/1) ... [2021-11-21 01:39:16,572 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:39:16,593 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:39:16,758 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_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/sv-benchmarks/c/array-industry-pattern/check_removal_from_set_after_insertion.c[342,355] [2021-11-21 01:39:16,816 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:39:16,826 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:39:16,841 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_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/sv-benchmarks/c/array-industry-pattern/check_removal_from_set_after_insertion.c[342,355] [2021-11-21 01:39:16,857 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:39:16,874 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:39:16,875 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:39:16 WrapperNode [2021-11-21 01:39:16,875 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:39:16,877 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:39:16,877 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:39:16,877 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:39:16,893 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:39:16" (1/1) ... [2021-11-21 01:39:16,920 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:39:16" (1/1) ... [2021-11-21 01:39:16,951 INFO L137 Inliner]: procedures = 16, calls = 24, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 131 [2021-11-21 01:39:16,951 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:39:16,952 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:39:16,952 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:39:16,953 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:39:16,960 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:39:16" (1/1) ... [2021-11-21 01:39:16,960 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:39:16" (1/1) ... [2021-11-21 01:39:16,963 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:39:16" (1/1) ... [2021-11-21 01:39:16,964 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:39:16" (1/1) ... [2021-11-21 01:39:16,972 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:39:16" (1/1) ... [2021-11-21 01:39:16,978 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:39:16" (1/1) ... [2021-11-21 01:39:16,981 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:39:16" (1/1) ... [2021-11-21 01:39:16,984 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:39:16,989 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:39:16,989 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:39:16,990 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:39:16,991 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:39:16" (1/1) ... [2021-11-21 01:39:17,003 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:39:17,016 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:39:17,035 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:39:17,073 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:39:17,092 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:39:17,093 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:39:17,093 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 01:39:17,093 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 01:39:17,094 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:39:17,094 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:39:17,094 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 01:39:17,094 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 01:39:17,214 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:39:17,216 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:39:17,452 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:39:17,523 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:39:17,523 INFO L301 CfgBuilder]: Removed 6 assume(true) statements. [2021-11-21 01:39:17,526 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:39:17 BoogieIcfgContainer [2021-11-21 01:39:17,526 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:39:17,528 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:39:17,528 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:39:17,532 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:39:17,532 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:39:16" (1/3) ... [2021-11-21 01:39:17,533 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2e4da900 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:39:17, skipping insertion in model container [2021-11-21 01:39:17,533 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:39:16" (2/3) ... [2021-11-21 01:39:17,534 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2e4da900 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:39:17, skipping insertion in model container [2021-11-21 01:39:17,534 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:39:17" (3/3) ... [2021-11-21 01:39:17,535 INFO L111 eAbstractionObserver]: Analyzing ICFG check_removal_from_set_after_insertion.c [2021-11-21 01:39:17,542 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:39:17,542 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:39:17,635 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:39:17,644 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 01:39:17,644 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:39:17,660 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 16 states have internal predecessors, (26), 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 01:39:17,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-21 01:39:17,667 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:39:17,668 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:39:17,668 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:39:17,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:39:17,674 INFO L85 PathProgramCache]: Analyzing trace with hash -1379774409, now seen corresponding path program 1 times [2021-11-21 01:39:17,694 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:39:17,696 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1949276764] [2021-11-21 01:39:17,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:39:17,697 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:39:17,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:39:17,936 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 01:39:17,937 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:39:17,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1949276764] [2021-11-21 01:39:17,939 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1949276764] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:39:17,939 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:39:17,939 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:39:17,941 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991417595] [2021-11-21 01:39:17,943 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:39:17,950 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:39:17,951 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:39:17,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:39:17,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:39:17,982 INFO L87 Difference]: Start difference. First operand has 17 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 16 states have internal predecessors, (26), 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 3.0) internal successors, (9), 2 states have internal predecessors, (9), 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 01:39:18,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:39:18,085 INFO L93 Difference]: Finished difference Result 33 states and 51 transitions. [2021-11-21 01:39:18,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:39:18,089 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 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 9 [2021-11-21 01:39:18,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:39:18,098 INFO L225 Difference]: With dead ends: 33 [2021-11-21 01:39:18,099 INFO L226 Difference]: Without dead ends: 16 [2021-11-21 01:39:18,102 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 01:39:18,110 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:39:18,112 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:39:18,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-21 01:39:18,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-11-21 01:39:18,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 15 states have internal predecessors, (23), 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 01:39:18,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 23 transitions. [2021-11-21 01:39:18,143 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 23 transitions. Word has length 9 [2021-11-21 01:39:18,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:39:18,143 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 23 transitions. [2021-11-21 01:39:18,144 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 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 01:39:18,144 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 23 transitions. [2021-11-21 01:39:18,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-21 01:39:18,145 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:39:18,145 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:39:18,145 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:39:18,146 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:39:18,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:39:18,147 INFO L85 PathProgramCache]: Analyzing trace with hash -1484939476, now seen corresponding path program 1 times [2021-11-21 01:39:18,147 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:39:18,147 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1961169270] [2021-11-21 01:39:18,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:39:18,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:39:18,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:39:18,244 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 01:39:18,245 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:39:18,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1961169270] [2021-11-21 01:39:18,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1961169270] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:39:18,246 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:39:18,247 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 01:39:18,247 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [351438172] [2021-11-21 01:39:18,247 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:39:18,249 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:39:18,249 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:39:18,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:39:18,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:39:18,251 INFO L87 Difference]: Start difference. First operand 16 states and 23 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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 01:39:18,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:39:18,325 INFO L93 Difference]: Finished difference Result 29 states and 42 transitions. [2021-11-21 01:39:18,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:39:18,326 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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 10 [2021-11-21 01:39:18,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:39:18,327 INFO L225 Difference]: With dead ends: 29 [2021-11-21 01:39:18,328 INFO L226 Difference]: Without dead ends: 20 [2021-11-21 01:39:18,328 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:39:18,330 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 30 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:39:18,331 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 16 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:39:18,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-21 01:39:18,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2021-11-21 01:39:18,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.5) internal successors, (24), 16 states have internal predecessors, (24), 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 01:39:18,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 24 transitions. [2021-11-21 01:39:18,338 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 24 transitions. Word has length 10 [2021-11-21 01:39:18,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:39:18,339 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 24 transitions. [2021-11-21 01:39:18,339 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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 01:39:18,339 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 24 transitions. [2021-11-21 01:39:18,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-21 01:39:18,340 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:39:18,340 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:39:18,341 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 01:39:18,343 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:39:18,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:39:18,344 INFO L85 PathProgramCache]: Analyzing trace with hash 1350556832, now seen corresponding path program 1 times [2021-11-21 01:39:18,344 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:39:18,344 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2033529315] [2021-11-21 01:39:18,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:39:18,345 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:39:18,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:39:18,443 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:39:18,443 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:39:18,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2033529315] [2021-11-21 01:39:18,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2033529315] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:39:18,444 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:39:18,444 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 01:39:18,444 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1598485035] [2021-11-21 01:39:18,444 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:39:18,445 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:39:18,445 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:39:18,446 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:39:18,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:39:18,446 INFO L87 Difference]: Start difference. First operand 17 states and 24 transitions. Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 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 01:39:18,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:39:18,489 INFO L93 Difference]: Finished difference Result 27 states and 37 transitions. [2021-11-21 01:39:18,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:39:18,491 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 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 13 [2021-11-21 01:39:18,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:39:18,492 INFO L225 Difference]: With dead ends: 27 [2021-11-21 01:39:18,492 INFO L226 Difference]: Without dead ends: 18 [2021-11-21 01:39:18,493 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:39:18,494 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 10 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:39:18,495 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 13 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:39:18,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-21 01:39:18,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-11-21 01:39:18,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 states have internal predecessors, (24), 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 01:39:18,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 24 transitions. [2021-11-21 01:39:18,501 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 24 transitions. Word has length 13 [2021-11-21 01:39:18,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:39:18,502 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 24 transitions. [2021-11-21 01:39:18,502 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 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 01:39:18,502 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 24 transitions. [2021-11-21 01:39:18,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-21 01:39:18,503 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:39:18,503 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:39:18,503 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-21 01:39:18,504 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:39:18,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:39:18,505 INFO L85 PathProgramCache]: Analyzing trace with hash 141282585, now seen corresponding path program 1 times [2021-11-21 01:39:18,505 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:39:18,505 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1813042596] [2021-11-21 01:39:18,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:39:18,506 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:39:18,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:39:18,634 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:39:18,634 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:39:18,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1813042596] [2021-11-21 01:39:18,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1813042596] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:39:18,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1372246879] [2021-11-21 01:39:18,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:39:18,635 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:39:18,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:39:18,641 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:39:18,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:39:18,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:39:18,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:39:18,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:39:18,858 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:39:18,858 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:39:18,939 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:39:18,939 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1372246879] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:39:18,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [232892806] [2021-11-21 01:39:18,964 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-21 01:39:18,964 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:39:18,970 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:39:18,976 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:39:18,976 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:39:19,084 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:19,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:19,173 INFO L354 Elim1Store]: treesize reduction 70, result has 31.4 percent of original size [2021-11-21 01:39:19,174 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 53 [2021-11-21 01:39:19,294 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:19,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:19,300 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:19,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:19,403 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:39:19,409 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:39:19,670 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:19,671 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:19,673 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 61 [2021-11-21 01:39:20,055 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:20,056 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:20,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:20,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:20,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:20,066 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:20,067 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:39:20,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:20,073 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:39:20,129 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-21 01:39:20,130 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 354 treesize of output 322 [2021-11-21 01:39:20,838 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:39:20,854 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:39:20,855 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 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-21 01:39:21,499 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:39:21,522 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 01:39:21,522 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 30 treesize of output 25 [2021-11-21 01:39:22,161 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:39:22,174 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:39:22,175 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 40 treesize of output 30 [2021-11-21 01:39:23,060 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:39:24,572 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [232892806] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:39:24,572 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:39:24,572 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4, 3, 3] total 12 [2021-11-21 01:39:24,573 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636177080] [2021-11-21 01:39:24,573 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:39:24,573 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 01:39:24,573 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:39:24,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 01:39:24,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2021-11-21 01:39:24,576 INFO L87 Difference]: Start difference. First operand 18 states and 24 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 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 01:39:25,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:39:25,306 INFO L93 Difference]: Finished difference Result 38 states and 53 transitions. [2021-11-21 01:39:25,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 01:39:25,307 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 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 15 [2021-11-21 01:39:25,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:39:25,308 INFO L225 Difference]: With dead ends: 38 [2021-11-21 01:39:25,308 INFO L226 Difference]: Without dead ends: 24 [2021-11-21 01:39:25,309 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=64, Invalid=146, Unknown=0, NotChecked=0, Total=210 [2021-11-21 01:39:25,310 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 9 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:39:25,311 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 15 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:39:25,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-21 01:39:25,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22. [2021-11-21 01:39:25,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.380952380952381) internal successors, (29), 21 states have internal predecessors, (29), 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 01:39:25,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 29 transitions. [2021-11-21 01:39:25,320 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 29 transitions. Word has length 15 [2021-11-21 01:39:25,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:39:25,320 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 29 transitions. [2021-11-21 01:39:25,320 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 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 01:39:25,320 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 29 transitions. [2021-11-21 01:39:25,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-21 01:39:25,321 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:39:25,321 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:39:25,374 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:39:25,549 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:39:25,550 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:39:25,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:39:25,551 INFO L85 PathProgramCache]: Analyzing trace with hash 1119880071, now seen corresponding path program 1 times [2021-11-21 01:39:25,551 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:39:25,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [72144614] [2021-11-21 01:39:25,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:39:25,551 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:39:25,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:39:25,697 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:39:25,698 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:39:25,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [72144614] [2021-11-21 01:39:25,698 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [72144614] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:39:25,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [612191716] [2021-11-21 01:39:25,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:39:25,702 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:39:25,702 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:39:25,706 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:39:25,730 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:39:25,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:39:25,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:39:25,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:39:25,871 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:39:25,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:39:25,917 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:39:25,918 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [612191716] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:39:25,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1964294521] [2021-11-21 01:39:25,921 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:39:25,922 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:39:25,922 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:39:25,922 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:39:25,923 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:39:25,955 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:25,956 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:26,005 INFO L354 Elim1Store]: treesize reduction 70, result has 31.4 percent of original size [2021-11-21 01:39:26,005 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 53 [2021-11-21 01:39:26,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:26,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:26,087 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:26,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:26,163 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:39:26,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:39:26,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:26,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:26,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 61 [2021-11-21 01:39:26,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:26,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:26,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:26,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:26,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:26,512 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:26,513 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:39:26,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:26,518 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:39:26,563 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-21 01:39:26,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 354 treesize of output 322 [2021-11-21 01:39:27,092 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:39:27,107 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:39:27,107 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 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-21 01:39:27,751 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:39:27,761 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 01:39:27,762 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 30 treesize of output 25 [2021-11-21 01:39:29,857 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:39:29,868 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:39:29,868 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 40 treesize of output 30 [2021-11-21 01:39:37,433 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-21 01:39:37,434 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 28 treesize of output 27 [2021-11-21 01:39:38,554 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-21 01:39:38,554 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 28 treesize of output 27 [2021-11-21 01:39:39,468 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-21 01:39:39,469 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 28 treesize of output 27 [2021-11-21 01:39:41,045 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:39:42,393 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:39:42,394 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:39:42,394 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 8 [2021-11-21 01:39:42,394 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577259597] [2021-11-21 01:39:42,395 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:39:42,395 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 01:39:42,396 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:39:42,396 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 01:39:42,397 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=318, Unknown=0, NotChecked=0, Total=420 [2021-11-21 01:39:42,398 INFO L87 Difference]: Start difference. First operand 22 states and 29 transitions. Second operand has 9 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 states have internal predecessors, (33), 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 01:39:42,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:39:42,644 INFO L93 Difference]: Finished difference Result 84 states and 108 transitions. [2021-11-21 01:39:42,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 01:39:42,645 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 states have internal predecessors, (33), 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 19 [2021-11-21 01:39:42,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:39:42,646 INFO L225 Difference]: With dead ends: 84 [2021-11-21 01:39:42,646 INFO L226 Difference]: Without dead ends: 65 [2021-11-21 01:39:42,647 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 199 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=164, Invalid=538, Unknown=0, NotChecked=0, Total=702 [2021-11-21 01:39:42,649 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 75 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:39:42,649 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 37 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:39:42,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-21 01:39:42,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 30. [2021-11-21 01:39:42,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 29 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:39:42,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 38 transitions. [2021-11-21 01:39:42,662 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 38 transitions. Word has length 19 [2021-11-21 01:39:42,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:39:42,662 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 38 transitions. [2021-11-21 01:39:42,663 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 states have internal predecessors, (33), 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 01:39:42,663 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 38 transitions. [2021-11-21 01:39:42,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-21 01:39:42,664 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:39:42,664 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:39:42,696 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-21 01:39:42,896 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:39:42,896 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:39:42,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:39:42,897 INFO L85 PathProgramCache]: Analyzing trace with hash 1902894455, now seen corresponding path program 2 times [2021-11-21 01:39:42,897 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:39:42,897 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1553884338] [2021-11-21 01:39:42,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:39:42,897 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:39:42,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:39:43,018 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-21 01:39:43,019 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:39:43,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1553884338] [2021-11-21 01:39:43,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1553884338] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:39:43,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [550238420] [2021-11-21 01:39:43,020 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:39:43,020 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:39:43,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:39:43,021 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:39:43,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:39:43,088 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 01:39:43,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:39:43,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 01:39:43,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:39:43,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 35 [2021-11-21 01:39:43,339 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:39:43,340 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:39:43,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 64 treesize of output 48 [2021-11-21 01:39:43,586 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:39:43,586 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [550238420] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:39:43,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1182481248] [2021-11-21 01:39:43,593 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:39:43,593 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:39:43,594 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:39:43,594 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:39:43,595 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:39:43,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:43,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:43,712 INFO L354 Elim1Store]: treesize reduction 70, result has 31.4 percent of original size [2021-11-21 01:39:43,713 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 53 [2021-11-21 01:39:43,783 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:43,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:43,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:43,791 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:43,861 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:39:43,862 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:39:44,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:44,042 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:44,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 58 treesize of output 51 [2021-11-21 01:39:44,157 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:44,159 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:39:44,161 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:39:44,167 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:39:44,168 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:39:44,261 INFO L354 Elim1Store]: treesize reduction 250, result has 15.5 percent of original size [2021-11-21 01:39:44,262 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 334 treesize of output 324 [2021-11-21 01:39:45,487 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:39:45,504 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:39:45,505 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 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-21 01:39:46,200 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:39:46,217 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 01:39:46,217 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 30 treesize of output 25 [2021-11-21 01:39:48,363 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:39:48,378 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:39:48,379 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 40 treesize of output 30 [2021-11-21 01:39:54,562 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-21 01:39:54,563 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 28 treesize of output 27 [2021-11-21 01:39:55,645 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-21 01:39:55,645 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 28 treesize of output 27 [2021-11-21 01:39:56,471 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-21 01:39:56,471 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 28 treesize of output 27 [2021-11-21 01:39:57,963 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:39:58,954 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:39:58,954 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:39:58,955 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 16 [2021-11-21 01:39:58,955 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1059513820] [2021-11-21 01:39:58,955 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:39:58,955 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-21 01:39:58,956 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:39:58,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-21 01:39:58,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=633, Unknown=0, NotChecked=0, Total=812 [2021-11-21 01:39:58,957 INFO L87 Difference]: Start difference. First operand 30 states and 38 transitions. Second operand has 17 states, 17 states have (on average 2.823529411764706) internal successors, (48), 16 states have internal predecessors, (48), 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 01:39:59,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:39:59,994 INFO L93 Difference]: Finished difference Result 201 states and 246 transitions. [2021-11-21 01:39:59,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-21 01:39:59,995 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.823529411764706) internal successors, (48), 16 states have internal predecessors, (48), 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 23 [2021-11-21 01:39:59,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:39:59,999 INFO L225 Difference]: With dead ends: 201 [2021-11-21 01:39:59,999 INFO L226 Difference]: Without dead ends: 177 [2021-11-21 01:40:00,002 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1240 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=924, Invalid=2858, Unknown=0, NotChecked=0, Total=3782 [2021-11-21 01:40:00,004 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 288 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 166 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 288 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 329 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 166 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:40:00,004 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [288 Valid, 85 Invalid, 329 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [166 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:40:00,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2021-11-21 01:40:00,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 43. [2021-11-21 01:40:00,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.3571428571428572) internal successors, (57), 42 states have internal predecessors, (57), 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 01:40:00,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 57 transitions. [2021-11-21 01:40:00,024 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 57 transitions. Word has length 23 [2021-11-21 01:40:00,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:40:00,025 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 57 transitions. [2021-11-21 01:40:00,025 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.823529411764706) internal successors, (48), 16 states have internal predecessors, (48), 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 01:40:00,025 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 57 transitions. [2021-11-21 01:40:00,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-21 01:40:00,027 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:40:00,027 INFO L514 BasicCegarLoop]: trace histogram [7, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:40:00,063 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:40:00,237 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-21 01:40:00,238 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:40:00,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:40:00,238 INFO L85 PathProgramCache]: Analyzing trace with hash -318738090, now seen corresponding path program 1 times [2021-11-21 01:40:00,238 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:40:00,239 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [651537848] [2021-11-21 01:40:00,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:40:00,239 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:40:00,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:40:00,383 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:40:00,383 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:40:00,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [651537848] [2021-11-21 01:40:00,383 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [651537848] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:40:00,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1493693550] [2021-11-21 01:40:00,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:40:00,384 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:40:00,384 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:40:00,385 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:40:00,386 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:40:00,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:40:00,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 01:40:00,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:40:00,638 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:40:00,639 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:40:00,796 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:40:00,796 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1493693550] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:40:00,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [385788788] [2021-11-21 01:40:00,799 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:40:00,800 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:40:00,800 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:40:00,800 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:40:00,801 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:40:00,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:00,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:00,911 INFO L354 Elim1Store]: treesize reduction 70, result has 31.4 percent of original size [2021-11-21 01:40:00,912 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 53 [2021-11-21 01:40:00,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:00,994 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:00,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:00,999 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:01,070 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:40:01,071 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:40:01,177 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:01,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:01,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 58 treesize of output 51 [2021-11-21 01:40:01,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:01,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:01,376 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:40:01,377 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:40:01,377 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:40:01,448 INFO L354 Elim1Store]: treesize reduction 250, result has 15.5 percent of original size [2021-11-21 01:40:01,448 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 334 treesize of output 324 [2021-11-21 01:40:02,704 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:40:02,721 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:40:02,721 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 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-21 01:40:03,319 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:40:03,330 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:40:03,330 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 40 treesize of output 30 [2021-11-21 01:40:05,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:05,371 INFO L354 Elim1Store]: treesize reduction 253, result has 24.0 percent of original size [2021-11-21 01:40:05,371 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 169 treesize of output 192 [2021-11-21 01:40:11,886 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-21 01:40:11,889 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 28 treesize of output 27 [2021-11-21 01:40:12,880 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-21 01:40:12,881 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 28 treesize of output 27 [2021-11-21 01:40:13,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:13,474 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 24 treesize of output 24 [2021-11-21 01:40:13,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:13,524 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:13,524 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:13,525 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 65 treesize of output 58 [2021-11-21 01:40:13,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:13,653 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 24 treesize of output 24 [2021-11-21 01:40:14,377 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:40:15,200 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:40:15,201 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:40:15,201 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 25 [2021-11-21 01:40:15,201 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338236848] [2021-11-21 01:40:15,201 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:40:15,201 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-21 01:40:15,202 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:40:15,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-21 01:40:15,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=420, Invalid=986, Unknown=0, NotChecked=0, Total=1406 [2021-11-21 01:40:15,206 INFO L87 Difference]: Start difference. First operand 43 states and 57 transitions. Second operand has 26 states, 26 states have (on average 1.6153846153846154) internal successors, (42), 25 states have internal predecessors, (42), 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 01:40:15,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:40:15,296 INFO L93 Difference]: Finished difference Result 90 states and 127 transitions. [2021-11-21 01:40:15,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-21 01:40:15,297 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.6153846153846154) internal successors, (42), 25 states have internal predecessors, (42), 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 28 [2021-11-21 01:40:15,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:40:15,298 INFO L225 Difference]: With dead ends: 90 [2021-11-21 01:40:15,298 INFO L226 Difference]: Without dead ends: 56 [2021-11-21 01:40:15,299 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 741 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=420, Invalid=986, Unknown=0, NotChecked=0, Total=1406 [2021-11-21 01:40:15,300 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 7 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:40:15,300 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 27 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:40:15,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-21 01:40:15,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 52. [2021-11-21 01:40:15,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.2941176470588236) internal successors, (66), 51 states have internal predecessors, (66), 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 01:40:15,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 66 transitions. [2021-11-21 01:40:15,314 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 66 transitions. Word has length 28 [2021-11-21 01:40:15,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:40:15,314 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 66 transitions. [2021-11-21 01:40:15,315 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.6153846153846154) internal successors, (42), 25 states have internal predecessors, (42), 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 01:40:15,315 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 66 transitions. [2021-11-21 01:40:15,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-21 01:40:15,316 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:40:15,316 INFO L514 BasicCegarLoop]: trace histogram [16, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:40:15,350 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:40:15,532 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:40:15,533 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:40:15,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:40:15,533 INFO L85 PathProgramCache]: Analyzing trace with hash -850733375, now seen corresponding path program 2 times [2021-11-21 01:40:15,533 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:40:15,533 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [817045841] [2021-11-21 01:40:15,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:40:15,534 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:40:15,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:40:15,790 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:40:15,790 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:40:15,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [817045841] [2021-11-21 01:40:15,790 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [817045841] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:40:15,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2044456983] [2021-11-21 01:40:15,790 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:40:15,791 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:40:15,791 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:40:15,794 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:40:15,812 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:40:15,886 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:40:15,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:40:15,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 01:40:15,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:40:16,035 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 143 trivial. 0 not checked. [2021-11-21 01:40:16,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:40:16,142 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 143 trivial. 0 not checked. [2021-11-21 01:40:16,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2044456983] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:40:16,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2045251089] [2021-11-21 01:40:16,144 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:40:16,145 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:40:16,145 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:40:16,145 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:40:16,145 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:40:16,168 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:16,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:16,217 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:40:16,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:40:16,289 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:16,289 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:16,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 10 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2021-11-21 01:40:16,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:16,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:16,369 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 58 treesize of output 51 [2021-11-21 01:40:16,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:16,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:16,452 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:40:16,453 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:40:16,453 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:40:16,509 INFO L354 Elim1Store]: treesize reduction 250, result has 15.5 percent of original size [2021-11-21 01:40:16,510 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 334 treesize of output 324 [2021-11-21 01:40:17,501 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:40:17,511 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:40:17,512 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 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-21 01:40:18,018 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:40:18,027 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:40:18,027 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 40 treesize of output 30 [2021-11-21 01:40:19,658 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:40:19,669 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:40:19,669 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 40 treesize of output 30 [2021-11-21 01:40:25,294 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-21 01:40:25,295 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 28 treesize of output 27 [2021-11-21 01:40:26,418 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-21 01:40:26,419 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 28 treesize of output 27 [2021-11-21 01:40:27,517 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-21 01:40:27,517 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 28 treesize of output 27 [2021-11-21 01:40:28,070 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:28,073 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 24 treesize of output 24 [2021-11-21 01:40:28,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:28,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:28,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:28,202 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 65 treesize of output 58 [2021-11-21 01:40:28,275 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:28,276 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 24 treesize of output 24 [2021-11-21 01:40:29,051 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:40:30,051 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:40:30,051 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:40:30,051 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 5, 5] total 26 [2021-11-21 01:40:30,051 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537552285] [2021-11-21 01:40:30,051 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:40:30,052 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-21 01:40:30,052 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:40:30,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-21 01:40:30,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=332, Invalid=1150, Unknown=0, NotChecked=0, Total=1482 [2021-11-21 01:40:30,054 INFO L87 Difference]: Start difference. First operand 52 states and 66 transitions. Second operand has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 26 states have internal predecessors, (55), 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 01:40:30,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:40:30,646 INFO L93 Difference]: Finished difference Result 225 states and 278 transitions. [2021-11-21 01:40:30,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-21 01:40:30,646 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 26 states have internal predecessors, (55), 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 37 [2021-11-21 01:40:30,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:40:30,650 INFO L225 Difference]: With dead ends: 225 [2021-11-21 01:40:30,650 INFO L226 Difference]: Without dead ends: 191 [2021-11-21 01:40:30,652 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 947 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=748, Invalid=2558, Unknown=0, NotChecked=0, Total=3306 [2021-11-21 01:40:30,653 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 338 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 194 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 338 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:40:30,653 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [338 Valid, 92 Invalid, 305 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 194 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:40:30,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-11-21 01:40:30,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 81. [2021-11-21 01:40:30,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 80 states have (on average 1.3375) internal successors, (107), 80 states have internal predecessors, (107), 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 01:40:30,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 107 transitions. [2021-11-21 01:40:30,703 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 107 transitions. Word has length 37 [2021-11-21 01:40:30,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:40:30,704 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 107 transitions. [2021-11-21 01:40:30,704 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 26 states have internal predecessors, (55), 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 01:40:30,704 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 107 transitions. [2021-11-21 01:40:30,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-21 01:40:30,712 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:40:30,712 INFO L514 BasicCegarLoop]: trace histogram [17, 6, 6, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:40:30,753 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:40:30,938 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:40:30,938 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:40:30,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:40:30,939 INFO L85 PathProgramCache]: Analyzing trace with hash 2029273142, now seen corresponding path program 3 times [2021-11-21 01:40:30,939 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:40:30,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [654789844] [2021-11-21 01:40:30,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:40:30,939 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:40:31,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:40:31,292 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-21 01:40:31,293 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:40:31,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [654789844] [2021-11-21 01:40:31,293 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [654789844] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:40:31,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1434364822] [2021-11-21 01:40:31,293 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:40:31,293 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:40:31,293 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:40:31,294 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:40:31,295 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:40:31,360 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:40:31,360 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:40:31,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-21 01:40:31,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:40:32,498 INFO L354 Elim1Store]: treesize reduction 214, result has 18.9 percent of original size [2021-11-21 01:40:32,499 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 67 treesize of output 83 [2021-11-21 01:40:43,159 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2021-11-21 01:40:43,159 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:40:46,585 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 84 treesize of output 70 [2021-11-21 01:40:46,628 INFO L354 Elim1Store]: treesize reduction 116, result has 22.1 percent of original size [2021-11-21 01:40:46,628 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 91 treesize of output 78 [2021-11-21 01:40:46,719 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2021-11-21 01:40:46,720 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1434364822] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:40:46,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2084251167] [2021-11-21 01:40:46,722 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:40:46,722 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:40:46,722 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:40:46,722 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:40:46,722 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:40:46,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:46,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:46,786 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:40:46,787 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:40:46,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:46,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:46,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 10 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2021-11-21 01:40:46,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:46,928 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:46,929 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 58 treesize of output 51 [2021-11-21 01:40:47,048 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:47,049 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:47,050 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:40:47,051 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:40:47,051 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:40:47,127 INFO L354 Elim1Store]: treesize reduction 250, result has 15.5 percent of original size [2021-11-21 01:40:47,128 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 334 treesize of output 324 [2021-11-21 01:40:48,039 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:40:48,049 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:40:48,050 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 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-21 01:40:48,579 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:40:48,588 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:40:48,588 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 40 treesize of output 30 [2021-11-21 01:40:50,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:50,210 INFO L354 Elim1Store]: treesize reduction 253, result has 24.0 percent of original size [2021-11-21 01:40:50,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 166 treesize of output 189 [2021-11-21 01:40:56,989 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-21 01:40:56,990 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 28 treesize of output 27 [2021-11-21 01:40:58,101 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-21 01:40:58,101 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 28 treesize of output 27 [2021-11-21 01:40:59,188 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-21 01:40:59,189 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 28 treesize of output 27 [2021-11-21 01:40:59,883 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:59,884 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 24 treesize of output 24 [2021-11-21 01:40:59,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:59,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:59,986 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:59,987 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 65 treesize of output 58 [2021-11-21 01:41:00,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:00,060 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 24 treesize of output 24 [2021-11-21 01:41:01,300 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:41:02,510 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:41:02,511 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:41:02,511 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 10, 10] total 34 [2021-11-21 01:41:02,511 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142769775] [2021-11-21 01:41:02,511 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:41:02,511 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-21 01:41:02,511 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:41:02,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-21 01:41:02,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=360, Invalid=1706, Unknown=4, NotChecked=0, Total=2070 [2021-11-21 01:41:02,513 INFO L87 Difference]: Start difference. First operand 81 states and 107 transitions. Second operand has 34 states, 34 states have (on average 1.8235294117647058) internal successors, (62), 34 states have internal predecessors, (62), 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 01:41:31,919 WARN L227 SmtUtils]: Spent 23.09s on a formula simplification. DAG size of input: 67 DAG size of output: 67 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 01:41:31,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:41:31,951 INFO L93 Difference]: Finished difference Result 157 states and 212 transitions. [2021-11-21 01:41:31,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-21 01:41:31,952 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.8235294117647058) internal successors, (62), 34 states have internal predecessors, (62), 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 50 [2021-11-21 01:41:31,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:41:31,953 INFO L225 Difference]: With dead ends: 157 [2021-11-21 01:41:31,953 INFO L226 Difference]: Without dead ends: 95 [2021-11-21 01:41:31,955 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 121 SyntacticMatches, 2 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 786 ImplicationChecksByTransitivity, 44.7s TimeCoverageRelationStatistics Valid=385, Invalid=1961, Unknown=6, NotChecked=0, Total=2352 [2021-11-21 01:41:31,956 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 4 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 104 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:41:31,956 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 47 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 62 Invalid, 0 Unknown, 104 Unchecked, 0.1s Time] [2021-11-21 01:41:31,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-21 01:41:31,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 88. [2021-11-21 01:41:31,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 87 states have (on average 1.3333333333333333) internal successors, (116), 87 states have internal predecessors, (116), 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 01:41:31,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 116 transitions. [2021-11-21 01:41:31,983 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 116 transitions. Word has length 50 [2021-11-21 01:41:31,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:41:31,984 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 116 transitions. [2021-11-21 01:41:31,984 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.8235294117647058) internal successors, (62), 34 states have internal predecessors, (62), 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 01:41:31,984 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 116 transitions. [2021-11-21 01:41:31,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-21 01:41:31,986 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:41:31,986 INFO L514 BasicCegarLoop]: trace histogram [18, 6, 6, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:41:32,016 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-21 01:41:32,205 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:41:32,206 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:41:32,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:41:32,207 INFO L85 PathProgramCache]: Analyzing trace with hash -2128836676, now seen corresponding path program 4 times [2021-11-21 01:41:32,208 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:41:32,208 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1242230556] [2021-11-21 01:41:32,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:41:32,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:41:32,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:41:32,556 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-21 01:41:32,556 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:41:32,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1242230556] [2021-11-21 01:41:32,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1242230556] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:41:32,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2069523058] [2021-11-21 01:41:32,556 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:41:32,556 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:41:32,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:41:32,557 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:41:32,558 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:41:32,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:41:32,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 422 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-21 01:41:32,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:41:33,155 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-21 01:41:33,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:41:33,929 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-21 01:41:33,930 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2069523058] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:41:33,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2070755280] [2021-11-21 01:41:33,932 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:41:33,932 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:41:33,933 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:41:33,933 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:41:33,933 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:41:33,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:33,955 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:34,017 INFO L354 Elim1Store]: treesize reduction 70, result has 31.4 percent of original size [2021-11-21 01:41:34,018 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 53 [2021-11-21 01:41:34,068 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:34,072 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:34,149 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:41:34,150 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:41:34,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:34,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:34,280 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 61 [2021-11-21 01:41:34,478 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:34,479 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:34,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:34,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:34,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:34,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:34,497 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:41:34,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:34,502 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:41:34,551 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-21 01:41:34,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 354 treesize of output 322 [2021-11-21 01:41:34,878 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:41:34,890 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:41:34,890 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 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-21 01:41:35,480 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:41:35,491 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:41:35,491 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 40 treesize of output 30 [2021-11-21 01:41:37,181 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:41:37,192 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:41:37,193 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 40 treesize of output 30 [2021-11-21 01:41:43,804 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-21 01:41:43,805 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 28 treesize of output 27 [2021-11-21 01:41:44,704 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-21 01:41:44,705 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 28 treesize of output 27 [2021-11-21 01:41:45,886 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-21 01:41:45,886 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 28 treesize of output 27 [2021-11-21 01:41:46,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:46,912 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 24 treesize of output 24 [2021-11-21 01:41:47,001 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:47,003 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:47,004 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:47,005 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 65 treesize of output 58 [2021-11-21 01:41:47,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:47,155 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 24 treesize of output 24 [2021-11-21 01:41:48,210 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:41:49,181 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:41:49,182 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:41:49,182 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 58 [2021-11-21 01:41:49,182 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929557345] [2021-11-21 01:41:49,182 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:41:49,183 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-21 01:41:49,183 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:41:49,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-21 01:41:49,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1773, Invalid=3197, Unknown=0, NotChecked=0, Total=4970 [2021-11-21 01:41:49,186 INFO L87 Difference]: Start difference. First operand 88 states and 116 transitions. Second operand has 59 states, 59 states have (on average 1.271186440677966) internal successors, (75), 58 states have internal predecessors, (75), 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 01:41:49,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:41:49,379 INFO L93 Difference]: Finished difference Result 178 states and 253 transitions. [2021-11-21 01:41:49,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-21 01:41:49,380 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.271186440677966) internal successors, (75), 58 states have internal predecessors, (75), 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 52 [2021-11-21 01:41:49,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:41:49,381 INFO L225 Difference]: With dead ends: 178 [2021-11-21 01:41:49,381 INFO L226 Difference]: Without dead ends: 110 [2021-11-21 01:41:49,383 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2589 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1773, Invalid=3197, Unknown=0, NotChecked=0, Total=4970 [2021-11-21 01:41:49,383 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 7 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 190 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:41:49,384 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 39 Invalid, 190 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:41:49,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-21 01:41:49,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 108. [2021-11-21 01:41:49,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 107 states have (on average 1.2710280373831775) internal successors, (136), 107 states have internal predecessors, (136), 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 01:41:49,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 136 transitions. [2021-11-21 01:41:49,403 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 136 transitions. Word has length 52 [2021-11-21 01:41:49,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:41:49,404 INFO L470 AbstractCegarLoop]: Abstraction has 108 states and 136 transitions. [2021-11-21 01:41:49,404 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.271186440677966) internal successors, (75), 58 states have internal predecessors, (75), 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 01:41:49,404 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 136 transitions. [2021-11-21 01:41:49,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-21 01:41:49,405 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:41:49,405 INFO L514 BasicCegarLoop]: trace histogram [38, 6, 6, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:41:49,429 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:41:49,613 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-21 01:41:49,614 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:41:49,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:41:49,614 INFO L85 PathProgramCache]: Analyzing trace with hash -1801587332, now seen corresponding path program 5 times [2021-11-21 01:41:49,614 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:41:49,614 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686173178] [2021-11-21 01:41:49,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:41:49,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:41:49,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:41:50,576 INFO L134 CoverageAnalysis]: Checked inductivity of 801 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-21 01:41:50,576 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:41:50,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686173178] [2021-11-21 01:41:50,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1686173178] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:41:50,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [872471228] [2021-11-21 01:41:50,577 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:41:50,577 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:41:50,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:41:50,582 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:41:50,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:41:50,674 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:41:50,674 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:41:50,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 01:41:50,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:41:50,884 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 30 [2021-11-21 01:41:51,002 INFO L134 CoverageAnalysis]: Checked inductivity of 801 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 792 trivial. 0 not checked. [2021-11-21 01:41:51,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:41:51,405 INFO L134 CoverageAnalysis]: Checked inductivity of 801 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 792 trivial. 0 not checked. [2021-11-21 01:41:51,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [872471228] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:41:51,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [637381209] [2021-11-21 01:41:51,407 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:41:51,408 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:41:51,408 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:41:51,408 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:41:51,408 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:41:51,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:51,443 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:51,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:51,447 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:51,499 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:41:51,499 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:41:51,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:51,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:51,545 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 10 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2021-11-21 01:41:51,674 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:51,675 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:51,676 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 58 treesize of output 51 [2021-11-21 01:41:51,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:51,790 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:41:51,792 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:41:51,792 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:41:51,793 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:41:51,863 INFO L354 Elim1Store]: treesize reduction 250, result has 15.5 percent of original size [2021-11-21 01:41:51,864 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 334 treesize of output 324 [2021-11-21 01:41:52,971 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:41:52,990 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:41:52,990 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 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-21 01:41:53,598 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:41:53,608 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 01:41:53,608 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 30 treesize of output 25 [2021-11-21 01:41:55,500 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:41:55,580 INFO L354 Elim1Store]: treesize reduction 242, result has 21.4 percent of original size [2021-11-21 01:41:55,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 161 treesize of output 175 [2021-11-21 01:42:02,488 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-21 01:42:02,488 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 28 treesize of output 27 [2021-11-21 01:42:03,704 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-21 01:42:03,705 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 28 treesize of output 27 [2021-11-21 01:42:04,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:42:04,384 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 24 treesize of output 24 [2021-11-21 01:42:04,527 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:42:04,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:42:04,529 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:42:04,529 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 65 treesize of output 58 [2021-11-21 01:42:04,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:42:04,646 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 24 treesize of output 24 [2021-11-21 01:42:05,749 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:42:07,248 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:42:07,248 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:42:07,249 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 8, 8] total 54 [2021-11-21 01:42:07,249 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1736838736] [2021-11-21 01:42:07,249 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:42:07,250 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-21 01:42:07,250 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:42:07,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-21 01:42:07,252 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1518, Invalid=2904, Unknown=0, NotChecked=0, Total=4422 [2021-11-21 01:42:07,252 INFO L87 Difference]: Start difference. First operand 108 states and 136 transitions. Second operand has 55 states, 55 states have (on average 1.6181818181818182) internal successors, (89), 54 states have internal predecessors, (89), 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 01:42:14,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:42:14,742 INFO L93 Difference]: Finished difference Result 966 states and 1109 transitions. [2021-11-21 01:42:14,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2021-11-21 01:42:14,743 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.6181818181818182) internal successors, (89), 54 states have internal predecessors, (89), 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 72 [2021-11-21 01:42:14,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:42:14,749 INFO L225 Difference]: With dead ends: 966 [2021-11-21 01:42:14,749 INFO L226 Difference]: Without dead ends: 898 [2021-11-21 01:42:14,761 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 189 SyntacticMatches, 0 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12165 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=10971, Invalid=26859, Unknown=0, NotChecked=0, Total=37830 [2021-11-21 01:42:14,762 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 2347 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 435 mSolverCounterSat, 1281 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2347 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 1716 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1281 IncrementalHoareTripleChecker+Valid, 435 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:42:14,762 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2347 Valid, 294 Invalid, 1716 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1281 Valid, 435 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-21 01:42:14,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 898 states. [2021-11-21 01:42:14,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 898 to 184. [2021-11-21 01:42:14,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 183 states have (on average 1.349726775956284) internal successors, (247), 183 states have internal predecessors, (247), 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 01:42:14,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 247 transitions. [2021-11-21 01:42:14,834 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 247 transitions. Word has length 72 [2021-11-21 01:42:14,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:42:14,835 INFO L470 AbstractCegarLoop]: Abstraction has 184 states and 247 transitions. [2021-11-21 01:42:14,835 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 1.6181818181818182) internal successors, (89), 54 states have internal predecessors, (89), 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 01:42:14,836 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 247 transitions. [2021-11-21 01:42:14,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-21 01:42:14,838 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:42:14,838 INFO L514 BasicCegarLoop]: trace histogram [44, 6, 6, 5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:42:14,868 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-11-21 01:42:15,055 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:42:15,055 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:42:15,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:42:15,056 INFO L85 PathProgramCache]: Analyzing trace with hash -508577946, now seen corresponding path program 6 times [2021-11-21 01:42:15,056 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:42:15,056 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1143681445] [2021-11-21 01:42:15,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:42:15,056 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:42:15,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:42:16,250 INFO L134 CoverageAnalysis]: Checked inductivity of 1057 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-11-21 01:42:16,251 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:42:16,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1143681445] [2021-11-21 01:42:16,251 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1143681445] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:42:16,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [503677895] [2021-11-21 01:42:16,251 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:42:16,251 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:42:16,251 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:42:16,252 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:42:16,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6e2bdecf-4f8b-4ca9-a91f-e572c4d1568d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 01:42:16,334 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:42:16,334 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:42:16,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-21 01:42:16,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:42:16,995 INFO L354 Elim1Store]: treesize reduction 210, result has 14.3 percent of original size [2021-11-21 01:42:16,996 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 14 case distinctions, treesize of input 57 treesize of output 59 [2021-11-21 01:42:17,147 INFO L354 Elim1Store]: treesize reduction 362, result has 14.6 percent of original size [2021-11-21 01:42:17,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 76 treesize of output 96 [2021-11-21 01:42:17,464 INFO L354 Elim1Store]: treesize reduction 626, result has 12.4 percent of original size [2021-11-21 01:42:17,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 36 case distinctions, treesize of input 102 treesize of output 132 [2021-11-21 01:42:21,954 INFO L134 CoverageAnalysis]: Checked inductivity of 1057 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1041 trivial. 0 not checked. [2021-11-21 01:42:21,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:44:22,644 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 539 treesize of output 467 [2021-11-21 01:44:22,860 INFO L354 Elim1Store]: treesize reduction 395, result has 14.7 percent of original size [2021-11-21 01:44:22,861 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 53344 treesize of output 36851