./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/bor4.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/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_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/bor4.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/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_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/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 530f2a23e46989c01d5f933930e2ae4d9f59000418a38b175b5a857a453825fc --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:50:26,121 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:50:26,125 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:50:26,189 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:50:26,198 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:50:26,204 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:50:26,208 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:50:26,214 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:50:26,218 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:50:26,221 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:50:26,223 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:50:26,225 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:50:26,225 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:50:26,227 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:50:26,229 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:50:26,231 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:50:26,232 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:50:26,234 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:50:26,236 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:50:26,239 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:50:26,242 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:50:26,244 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:50:26,246 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:50:26,247 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:50:26,252 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:50:26,252 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:50:26,253 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:50:26,254 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:50:26,255 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:50:26,257 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:50:26,257 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:50:26,259 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:50:26,260 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:50:26,261 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:50:26,263 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:50:26,263 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:50:26,264 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:50:26,265 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:50:26,265 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:50:26,266 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:50:26,267 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:50:26,269 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:50:26,313 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:50:26,314 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:50:26,315 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:50:26,315 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:50:26,316 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:50:26,316 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:50:26,317 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:50:26,317 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:50:26,317 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:50:26,318 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:50:26,319 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:50:26,319 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:50:26,320 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:50:26,320 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:50:26,320 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:50:26,321 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:50:26,321 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:50:26,321 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:50:26,322 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:50:26,322 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:50:26,323 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:50:26,323 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:50:26,323 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:50:26,324 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:50:26,324 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:50:26,324 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:50:26,326 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:50:26,326 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:50:26,327 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:50:26,327 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:50:26,327 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:50:26,328 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:50:26,328 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:50:26,329 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:50:26,329 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:50:26,329 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:50:26,329 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:50:26,330 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:50:26,330 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:50:26,330 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:50:26,331 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:50:26,331 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_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 530f2a23e46989c01d5f933930e2ae4d9f59000418a38b175b5a857a453825fc [2021-11-21 01:50:26,692 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:50:26,726 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:50:26,729 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:50:26,731 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:50:26,732 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:50:26,733 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-crafted/bor4.i [2021-11-21 01:50:26,813 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/data/a01796be8/b3e81eb025ae467893bf705501c15281/FLAG374cabee4 [2021-11-21 01:50:27,382 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:50:27,383 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/sv-benchmarks/c/array-crafted/bor4.i [2021-11-21 01:50:27,391 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/data/a01796be8/b3e81eb025ae467893bf705501c15281/FLAG374cabee4 [2021-11-21 01:50:27,712 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/data/a01796be8/b3e81eb025ae467893bf705501c15281 [2021-11-21 01:50:27,715 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:50:27,717 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:50:27,719 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:50:27,720 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:50:27,724 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:50:27,726 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:50:27" (1/1) ... [2021-11-21 01:50:27,727 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ef02c44 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:27, skipping insertion in model container [2021-11-21 01:50:27,728 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:50:27" (1/1) ... [2021-11-21 01:50:27,737 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:50:27,774 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:50:28,042 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_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/sv-benchmarks/c/array-crafted/bor4.i[1303,1316] [2021-11-21 01:50:28,045 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:50:28,059 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:50:28,115 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_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/sv-benchmarks/c/array-crafted/bor4.i[1303,1316] [2021-11-21 01:50:28,116 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:50:28,134 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:50:28,134 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:28 WrapperNode [2021-11-21 01:50:28,135 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:50:28,136 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:50:28,136 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:50:28,136 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:50:28,146 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:28" (1/1) ... [2021-11-21 01:50:28,166 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:28" (1/1) ... [2021-11-21 01:50:28,206 INFO L137 Inliner]: procedures = 16, calls = 30, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 74 [2021-11-21 01:50:28,206 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:50:28,207 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:50:28,207 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:50:28,208 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:50:28,219 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:28" (1/1) ... [2021-11-21 01:50:28,220 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:28" (1/1) ... [2021-11-21 01:50:28,228 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:28" (1/1) ... [2021-11-21 01:50:28,228 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:28" (1/1) ... [2021-11-21 01:50:28,251 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:28" (1/1) ... [2021-11-21 01:50:28,256 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:28" (1/1) ... [2021-11-21 01:50:28,258 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:28" (1/1) ... [2021-11-21 01:50:28,260 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:50:28,261 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:50:28,261 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:50:28,262 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:50:28,265 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:28" (1/1) ... [2021-11-21 01:50:28,274 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:50:28,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:28,312 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:50:28,337 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:50:28,379 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:50:28,380 INFO L130 BoogieDeclarations]: Found specification of procedure bor [2021-11-21 01:50:28,380 INFO L138 BoogieDeclarations]: Found implementation of procedure bor [2021-11-21 01:50:28,380 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:50:28,381 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 01:50:28,381 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 01:50:28,381 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:50:28,382 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:50:28,382 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 01:50:28,382 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 01:50:28,456 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:50:28,458 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:50:28,635 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:50:28,670 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:50:28,671 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-21 01:50:28,674 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:50:28 BoogieIcfgContainer [2021-11-21 01:50:28,674 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:50:28,677 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:50:28,677 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:50:28,681 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:50:28,681 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:50:27" (1/3) ... [2021-11-21 01:50:28,683 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56685c9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:50:28, skipping insertion in model container [2021-11-21 01:50:28,683 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:28" (2/3) ... [2021-11-21 01:50:28,684 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56685c9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:50:28, skipping insertion in model container [2021-11-21 01:50:28,684 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:50:28" (3/3) ... [2021-11-21 01:50:28,686 INFO L111 eAbstractionObserver]: Analyzing ICFG bor4.i [2021-11-21 01:50:28,692 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:50:28,693 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:50:28,753 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:50:28,763 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 01:50:28,763 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:50:28,784 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:50:28,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-21 01:50:28,791 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:28,792 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:50:28,793 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:28,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:28,801 INFO L85 PathProgramCache]: Analyzing trace with hash -1439153059, now seen corresponding path program 1 times [2021-11-21 01:50:28,813 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:28,814 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1721665709] [2021-11-21 01:50:28,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:28,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:28,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:29,080 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 01:50:29,081 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:29,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1721665709] [2021-11-21 01:50:29,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1721665709] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:50:29,083 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:50:29,083 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 01:50:29,085 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883713706] [2021-11-21 01:50:29,086 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:50:29,093 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:50:29,094 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:29,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:50:29,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:50:29,129 INFO L87 Difference]: Start difference. First operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-21 01:50:29,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:29,188 INFO L93 Difference]: Finished difference Result 33 states and 43 transitions. [2021-11-21 01:50:29,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:50:29,192 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 20 [2021-11-21 01:50:29,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:29,201 INFO L225 Difference]: With dead ends: 33 [2021-11-21 01:50:29,201 INFO L226 Difference]: Without dead ends: 16 [2021-11-21 01:50:29,205 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 01:50:29,211 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:29,213 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 26 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:50:29,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-21 01:50:29,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-11-21 01:50:29,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:50:29,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2021-11-21 01:50:29,261 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 20 [2021-11-21 01:50:29,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:29,261 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2021-11-21 01:50:29,262 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-21 01:50:29,262 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2021-11-21 01:50:29,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-21 01:50:29,265 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:29,265 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:50:29,265 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:50:29,266 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:29,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:29,267 INFO L85 PathProgramCache]: Analyzing trace with hash -538547963, now seen corresponding path program 1 times [2021-11-21 01:50:29,268 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:29,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1235564273] [2021-11-21 01:50:29,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:29,269 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:29,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:29,394 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 01:50:29,395 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:29,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1235564273] [2021-11-21 01:50:29,402 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1235564273] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:29,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [676212785] [2021-11-21 01:50:29,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:29,403 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:29,404 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:29,420 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:29,427 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:50:29,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:29,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:50:29,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:29,653 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:50:29,654 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:50:29,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [676212785] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:50:29,654 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:50:29,655 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2021-11-21 01:50:29,656 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215710775] [2021-11-21 01:50:29,656 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:50:29,658 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:50:29,658 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:29,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:50:29,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:50:29,660 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 01:50:29,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:29,686 INFO L93 Difference]: Finished difference Result 29 states and 39 transitions. [2021-11-21 01:50:29,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:50:29,688 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), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 21 [2021-11-21 01:50:29,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:29,689 INFO L225 Difference]: With dead ends: 29 [2021-11-21 01:50:29,689 INFO L226 Difference]: Without dead ends: 17 [2021-11-21 01:50:29,690 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:50:29,693 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:29,694 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:50:29,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-21 01:50:29,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-21 01:50:29,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:50:29,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2021-11-21 01:50:29,702 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 21 [2021-11-21 01:50:29,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:29,702 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2021-11-21 01:50:29,703 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), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 01:50:29,703 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2021-11-21 01:50:29,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-21 01:50:29,704 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:29,705 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:50:29,754 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:29,929 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:29,929 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:29,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:29,931 INFO L85 PathProgramCache]: Analyzing trace with hash -807854650, now seen corresponding path program 1 times [2021-11-21 01:50:29,931 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:29,931 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [783962735] [2021-11-21 01:50:29,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:29,932 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:29,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:30,055 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 01:50:30,055 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:30,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [783962735] [2021-11-21 01:50:30,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [783962735] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:30,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1162751990] [2021-11-21 01:50:30,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:30,062 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:30,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:30,070 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:30,080 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:50:30,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:30,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:50:30,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:30,294 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-21 01:50:30,294 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:50:30,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1162751990] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:50:30,295 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:50:30,295 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2021-11-21 01:50:30,296 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123176469] [2021-11-21 01:50:30,296 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:50:30,297 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:50:30,297 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:30,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:50:30,298 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:50:30,298 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 01:50:30,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:30,328 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2021-11-21 01:50:30,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:50:30,331 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2021-11-21 01:50:30,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:30,333 INFO L225 Difference]: With dead ends: 27 [2021-11-21 01:50:30,333 INFO L226 Difference]: Without dead ends: 18 [2021-11-21 01:50:30,333 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:50:30,335 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:30,336 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:50:30,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-21 01:50:30,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-11-21 01:50:30,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:50:30,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2021-11-21 01:50:30,352 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 24 [2021-11-21 01:50:30,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:30,354 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2021-11-21 01:50:30,355 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 01:50:30,355 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2021-11-21 01:50:30,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-21 01:50:30,356 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:30,357 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:50:30,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:30,565 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:30,566 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:30,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:30,567 INFO L85 PathProgramCache]: Analyzing trace with hash 34772627, now seen corresponding path program 1 times [2021-11-21 01:50:30,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:30,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [634417188] [2021-11-21 01:50:30,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:30,568 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:30,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:30,655 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-21 01:50:30,655 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:30,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [634417188] [2021-11-21 01:50:30,656 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [634417188] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:30,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1908885644] [2021-11-21 01:50:30,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:30,657 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:30,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:30,658 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:30,662 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:50:30,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:30,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 01:50:30,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:30,852 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-21 01:50:30,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:50:30,963 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-21 01:50:30,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1908885644] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:50:30,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2051145317] [2021-11-21 01:50:30,994 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:50:30,994 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:50:31,001 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:50:31,008 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:50:31,009 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:50:31,168 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:31,194 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 01:50:31,195 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-21 01:50:31,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:31,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:31,300 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 01:50:31,301 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-21 01:50:31,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:31,451 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 23 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 83 treesize of output 106 [2021-11-21 01:50:31,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:31,752 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:31,754 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:31,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:31,762 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:31,765 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:50:31,835 INFO L354 Elim1Store]: treesize reduction 138, result has 20.2 percent of original size [2021-11-21 01:50:31,835 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 26 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 13 case distinctions, treesize of input 284 treesize of output 276 [2021-11-21 01:50:32,496 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:50:32,961 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:32,964 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-21 01:50:33,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:33,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 20 [2021-11-21 01:50:33,525 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:33,529 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:33,530 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:33,569 INFO L354 Elim1Store]: treesize reduction 65, result has 27.0 percent of original size [2021-11-21 01:50:33,569 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 3 case distinctions, treesize of input 54 treesize of output 62 [2021-11-21 01:50:33,751 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:33,752 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 01:50:33,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 01:50:34,386 INFO L197 IcfgInterpreter]: Interpreting procedure bor with input of size 15 for LOIs [2021-11-21 01:50:34,651 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:50:35,255 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:50:35,255 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:50:35,255 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 4] total 7 [2021-11-21 01:50:35,256 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938223309] [2021-11-21 01:50:35,256 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:50:35,256 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 01:50:35,257 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:35,257 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 01:50:35,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2021-11-21 01:50:35,258 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:50:35,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:35,296 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2021-11-21 01:50:35,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:50:35,297 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 25 [2021-11-21 01:50:35,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:35,298 INFO L225 Difference]: With dead ends: 36 [2021-11-21 01:50:35,298 INFO L226 Difference]: Without dead ends: 21 [2021-11-21 01:50:35,299 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2021-11-21 01:50:35,301 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:35,301 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:50:35,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-21 01:50:35,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-21 01:50:35,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:50:35,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-11-21 01:50:35,308 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 25 [2021-11-21 01:50:35,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:35,309 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-11-21 01:50:35,309 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:50:35,309 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-11-21 01:50:35,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-21 01:50:35,311 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:35,311 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:50:35,360 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:35,526 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:35,526 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:35,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:35,527 INFO L85 PathProgramCache]: Analyzing trace with hash 160034795, now seen corresponding path program 2 times [2021-11-21 01:50:35,527 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:35,527 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [536220353] [2021-11-21 01:50:35,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:35,527 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:35,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:35,587 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 01:50:35,587 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:35,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [536220353] [2021-11-21 01:50:35,588 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [536220353] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:35,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [878389669] [2021-11-21 01:50:35,588 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:50:35,589 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:35,589 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:35,590 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:35,622 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:50:35,667 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 01:50:35,668 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:50:35,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 01:50:35,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:35,730 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 01:50:35,730 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:50:35,802 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 01:50:35,803 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [878389669] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:50:35,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1320287553] [2021-11-21 01:50:35,809 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:50:35,810 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:50:35,811 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:50:35,812 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:50:35,812 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:50:35,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:35,873 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 01:50:35,873 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-21 01:50:35,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:35,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:35,931 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 01:50:35,932 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-21 01:50:36,013 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:36,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:36,019 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 23 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 111 [2021-11-21 01:50:36,188 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:36,192 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:36,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:36,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:36,199 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:36,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:36,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:36,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:36,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:36,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:36,211 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:36,257 INFO L354 Elim1Store]: treesize reduction 153, result has 12.6 percent of original size [2021-11-21 01:50:36,258 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 12 case distinctions, treesize of input 294 treesize of output 275 [2021-11-21 01:50:36,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:50:36,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:36,913 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-21 01:50:37,265 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:37,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:37,268 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:50:37,269 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 27 [2021-11-21 01:50:37,398 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:37,400 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:37,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:37,404 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:37,422 INFO L354 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2021-11-21 01:50:37,423 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 3 case distinctions, treesize of input 62 treesize of output 54 [2021-11-21 01:50:37,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:37,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 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 01:50:37,561 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 01:50:38,181 INFO L197 IcfgInterpreter]: Interpreting procedure bor with input of size 15 for LOIs [2021-11-21 01:50:38,421 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:50:39,364 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:50:39,365 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:50:39,365 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-21 01:50:39,365 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1131264899] [2021-11-21 01:50:39,365 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:50:39,366 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 01:50:39,366 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:39,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 01:50:39,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2021-11-21 01:50:39,367 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-21 01:50:39,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:39,404 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2021-11-21 01:50:39,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:50:39,406 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 28 [2021-11-21 01:50:39,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:39,407 INFO L225 Difference]: With dead ends: 38 [2021-11-21 01:50:39,407 INFO L226 Difference]: Without dead ends: 24 [2021-11-21 01:50:39,408 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2021-11-21 01:50:39,409 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:39,410 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 34 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:50:39,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-21 01:50:39,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-11-21 01:50:39,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:50:39,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2021-11-21 01:50:39,416 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 28 [2021-11-21 01:50:39,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:39,417 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2021-11-21 01:50:39,417 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-21 01:50:39,417 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2021-11-21 01:50:39,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-21 01:50:39,419 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:39,419 INFO L514 BasicCegarLoop]: trace histogram [12, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:50:39,468 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:39,634 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:39,634 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:39,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:39,635 INFO L85 PathProgramCache]: Analyzing trace with hash -1885684020, now seen corresponding path program 3 times [2021-11-21 01:50:39,635 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:39,635 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1900653662] [2021-11-21 01:50:39,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:39,636 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:39,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:39,747 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-11-21 01:50:39,748 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:39,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1900653662] [2021-11-21 01:50:39,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1900653662] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:39,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [351375266] [2021-11-21 01:50:39,748 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:50:39,749 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:39,749 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:39,750 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:39,778 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:50:39,827 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:50:39,827 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:50:39,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 01:50:39,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:39,941 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-21 01:50:39,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:50:40,091 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-21 01:50:40,091 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [351375266] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:50:40,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [874036204] [2021-11-21 01:50:40,096 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:50:40,096 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:50:40,097 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:50:40,097 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:50:40,097 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:50:40,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:40,153 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 01:50:40,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-21 01:50:40,191 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:40,193 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:40,210 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 01:50:40,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-21 01:50:40,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:40,318 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:40,321 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 23 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 83 treesize of output 106 [2021-11-21 01:50:40,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:40,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:40,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:40,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:40,454 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:40,457 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:50:40,513 INFO L354 Elim1Store]: treesize reduction 138, result has 20.2 percent of original size [2021-11-21 01:50:40,513 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 26 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 13 case distinctions, treesize of input 284 treesize of output 276 [2021-11-21 01:50:41,112 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:50:41,456 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:41,460 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-21 01:50:41,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:41,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:41,804 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:50:41,805 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 27 [2021-11-21 01:50:41,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:41,865 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:41,867 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:41,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:41,881 INFO L354 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2021-11-21 01:50:41,882 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 3 case distinctions, treesize of input 62 treesize of output 54 [2021-11-21 01:50:41,963 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:41,964 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 01:50:42,012 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 01:50:42,624 INFO L197 IcfgInterpreter]: Interpreting procedure bor with input of size 15 for LOIs [2021-11-21 01:50:42,849 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:50:43,613 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:50:43,613 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:50:43,613 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 6, 7] total 14 [2021-11-21 01:50:43,614 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985991444] [2021-11-21 01:50:43,614 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:50:43,615 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-21 01:50:43,615 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:43,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-21 01:50:43,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=577, Unknown=0, NotChecked=0, Total=702 [2021-11-21 01:50:43,616 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-21 01:50:43,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:43,675 INFO L93 Difference]: Finished difference Result 49 states and 63 transitions. [2021-11-21 01:50:43,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 01:50:43,675 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 37 [2021-11-21 01:50:43,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:43,676 INFO L225 Difference]: With dead ends: 49 [2021-11-21 01:50:43,676 INFO L226 Difference]: Without dead ends: 31 [2021-11-21 01:50:43,677 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 225 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=125, Invalid=577, Unknown=0, NotChecked=0, Total=702 [2021-11-21 01:50:43,679 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:43,679 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 70 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:50:43,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-21 01:50:43,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-11-21 01:50:43,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:50:43,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2021-11-21 01:50:43,686 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 37 [2021-11-21 01:50:43,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:43,687 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2021-11-21 01:50:43,687 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-21 01:50:43,688 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2021-11-21 01:50:43,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-21 01:50:43,689 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:43,690 INFO L514 BasicCegarLoop]: trace histogram [12, 10, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:50:43,729 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:43,906 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:43,906 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:43,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:43,907 INFO L85 PathProgramCache]: Analyzing trace with hash 210425085, now seen corresponding path program 4 times [2021-11-21 01:50:43,907 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:43,907 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1884218522] [2021-11-21 01:50:43,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:43,908 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:43,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:44,088 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2021-11-21 01:50:44,089 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:44,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1884218522] [2021-11-21 01:50:44,089 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1884218522] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:44,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1897850613] [2021-11-21 01:50:44,090 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:50:44,090 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:44,090 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:44,098 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:44,114 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:50:44,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:44,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 01:50:44,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:44,324 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2021-11-21 01:50:44,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:50:44,590 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2021-11-21 01:50:44,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1897850613] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:50:44,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [782346976] [2021-11-21 01:50:44,593 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:50:44,593 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:50:44,594 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:50:44,594 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:50:44,594 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:50:44,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:44,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:44,659 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 01:50:44,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-21 01:50:44,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:44,692 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 01:50:44,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:44,788 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:44,790 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 23 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 111 [2021-11-21 01:50:44,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:44,923 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:44,924 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:44,926 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:44,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:44,929 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:44,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:44,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:44,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:44,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:44,955 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:44,992 INFO L354 Elim1Store]: treesize reduction 153, result has 12.6 percent of original size [2021-11-21 01:50:44,993 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 12 case distinctions, treesize of input 294 treesize of output 275 [2021-11-21 01:50:45,258 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:50:45,532 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:45,533 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-21 01:50:45,818 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:45,819 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:45,820 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:50:45,820 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 27 [2021-11-21 01:50:45,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:45,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:45,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:45,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:45,956 INFO L354 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2021-11-21 01:50:45,957 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 3 case distinctions, treesize of input 62 treesize of output 54 [2021-11-21 01:50:46,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:46,033 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 01:50:46,105 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 01:50:46,629 INFO L197 IcfgInterpreter]: Interpreting procedure bor with input of size 15 for LOIs [2021-11-21 01:50:46,849 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:50:47,572 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:50:47,572 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:50:47,573 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 13] total 25 [2021-11-21 01:50:47,573 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075110580] [2021-11-21 01:50:47,573 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:50:47,574 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-21 01:50:47,574 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:47,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-21 01:50:47,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=1055, Unknown=0, NotChecked=0, Total=1406 [2021-11-21 01:50:47,576 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand has 25 states, 25 states have (on average 1.56) internal successors, (39), 25 states have internal predecessors, (39), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:50:47,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:47,649 INFO L93 Difference]: Finished difference Result 62 states and 81 transitions. [2021-11-21 01:50:47,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-21 01:50:47,650 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.56) internal successors, (39), 25 states have internal predecessors, (39), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 44 [2021-11-21 01:50:47,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:47,651 INFO L225 Difference]: With dead ends: 62 [2021-11-21 01:50:47,651 INFO L226 Difference]: Without dead ends: 43 [2021-11-21 01:50:47,653 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 504 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=351, Invalid=1055, Unknown=0, NotChecked=0, Total=1406 [2021-11-21 01:50:47,654 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:47,655 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 48 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:50:47,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-11-21 01:50:47,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-11-21 01:50:47,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 states have internal predecessors, (41), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:50:47,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2021-11-21 01:50:47,663 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 44 [2021-11-21 01:50:47,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:47,664 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2021-11-21 01:50:47,664 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.56) internal successors, (39), 25 states have internal predecessors, (39), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:50:47,664 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2021-11-21 01:50:47,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-21 01:50:47,667 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:47,667 INFO L514 BasicCegarLoop]: trace histogram [22, 12, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:50:47,711 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:47,894 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:47,894 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:47,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:47,895 INFO L85 PathProgramCache]: Analyzing trace with hash 1481216765, now seen corresponding path program 5 times [2021-11-21 01:50:47,895 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:47,895 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [85566817] [2021-11-21 01:50:47,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:47,895 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:47,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:48,298 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2021-11-21 01:50:48,298 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:48,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [85566817] [2021-11-21 01:50:48,298 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [85566817] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:48,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [909951733] [2021-11-21 01:50:48,299 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:50:48,299 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:48,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:48,300 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:48,302 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:50:48,370 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:50:48,370 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:50:48,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 01:50:48,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:48,588 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 52 proven. 10 refuted. 0 times theorem prover too weak. 305 trivial. 0 not checked. [2021-11-21 01:50:48,589 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:50:48,785 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 52 proven. 10 refuted. 0 times theorem prover too weak. 305 trivial. 0 not checked. [2021-11-21 01:50:48,786 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [909951733] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:50:48,786 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [911738113] [2021-11-21 01:50:48,788 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:50:48,788 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:50:48,789 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:50:48,789 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:50:48,789 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:50:48,816 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:48,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:48,834 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 01:50:48,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-21 01:50:48,859 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:48,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 01:50:48,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:48,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:48,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 23 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 111 [2021-11-21 01:50:48,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:48,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:48,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:49,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:49,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:49,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:49,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:49,018 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:49,019 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:49,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:49,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:49,055 INFO L354 Elim1Store]: treesize reduction 153, result has 12.6 percent of original size [2021-11-21 01:50:49,056 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 12 case distinctions, treesize of input 294 treesize of output 275 [2021-11-21 01:50:49,321 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:50:49,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:49,649 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-21 01:50:49,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:49,968 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 20 [2021-11-21 01:50:50,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:50,052 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:50,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:50,104 INFO L354 Elim1Store]: treesize reduction 65, result has 27.0 percent of original size [2021-11-21 01:50:50,104 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 3 case distinctions, treesize of input 54 treesize of output 62 [2021-11-21 01:50:50,262 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:50,263 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 01:50:50,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 01:50:50,816 INFO L197 IcfgInterpreter]: Interpreting procedure bor with input of size 15 for LOIs [2021-11-21 01:50:51,062 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:50:51,721 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:50:51,721 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:50:51,722 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 7, 7] total 35 [2021-11-21 01:50:51,722 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1841214414] [2021-11-21 01:50:51,722 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:50:51,723 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-21 01:50:51,723 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:51,724 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-21 01:50:51,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=416, Invalid=1840, Unknown=0, NotChecked=0, Total=2256 [2021-11-21 01:50:51,725 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand has 35 states, 35 states have (on average 1.5142857142857142) internal successors, (53), 35 states have internal predecessors, (53), 2 states have call successors, (6), 1 states have call predecessors, (6), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-21 01:50:51,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:51,834 INFO L93 Difference]: Finished difference Result 69 states and 86 transitions. [2021-11-21 01:50:51,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-21 01:50:51,835 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.5142857142857142) internal successors, (53), 35 states have internal predecessors, (53), 2 states have call successors, (6), 1 states have call predecessors, (6), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 56 [2021-11-21 01:50:51,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:51,836 INFO L225 Difference]: With dead ends: 69 [2021-11-21 01:50:51,836 INFO L226 Difference]: Without dead ends: 50 [2021-11-21 01:50:51,838 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 710 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=416, Invalid=1840, Unknown=0, NotChecked=0, Total=2256 [2021-11-21 01:50:51,839 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:51,840 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 106 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:50:51,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-21 01:50:51,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-11-21 01:50:51,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.0666666666666667) internal successors, (48), 45 states have internal predecessors, (48), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:50:51,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2021-11-21 01:50:51,849 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 56 [2021-11-21 01:50:51,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:51,850 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2021-11-21 01:50:51,850 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.5142857142857142) internal successors, (53), 35 states have internal predecessors, (53), 2 states have call successors, (6), 1 states have call predecessors, (6), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-21 01:50:51,850 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2021-11-21 01:50:51,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-21 01:50:51,854 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:51,854 INFO L514 BasicCegarLoop]: trace histogram [30, 23, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:50:51,894 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:52,070 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:52,070 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:52,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:52,070 INFO L85 PathProgramCache]: Analyzing trace with hash -10477499, now seen corresponding path program 6 times [2021-11-21 01:50:52,071 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:52,071 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1810870734] [2021-11-21 01:50:52,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:52,071 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:52,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:52,581 INFO L134 CoverageAnalysis]: Checked inductivity of 813 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2021-11-21 01:50:52,581 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:52,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1810870734] [2021-11-21 01:50:52,582 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1810870734] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:52,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [769022571] [2021-11-21 01:50:52,582 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:50:52,582 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:52,582 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:52,586 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:52,606 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:50:52,697 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:50:52,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:50:52,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-21 01:50:52,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:52,910 INFO L134 CoverageAnalysis]: Checked inductivity of 813 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2021-11-21 01:50:52,911 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:50:54,060 INFO L134 CoverageAnalysis]: Checked inductivity of 813 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2021-11-21 01:50:54,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [769022571] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:50:54,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1008783984] [2021-11-21 01:50:54,063 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:50:54,063 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:50:54,063 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:50:54,064 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:50:54,064 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:50:54,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:54,107 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:54,125 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 01:50:54,125 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-21 01:50:54,164 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:54,165 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 01:50:54,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:54,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:54,233 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 23 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 111 [2021-11-21 01:50:54,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:54,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:54,372 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:54,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:54,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:54,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:54,380 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:54,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:54,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:54,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:54,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:54,432 INFO L354 Elim1Store]: treesize reduction 153, result has 12.6 percent of original size [2021-11-21 01:50:54,433 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 12 case distinctions, treesize of input 294 treesize of output 275 [2021-11-21 01:50:54,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:50:55,027 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:55,029 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-21 01:50:55,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:55,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 20 [2021-11-21 01:50:55,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:55,447 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:55,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:55,479 INFO L354 Elim1Store]: treesize reduction 65, result has 27.0 percent of original size [2021-11-21 01:50:55,480 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 3 case distinctions, treesize of input 54 treesize of output 62 [2021-11-21 01:50:55,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:55,549 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 01:50:55,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 01:50:56,234 INFO L197 IcfgInterpreter]: Interpreting procedure bor with input of size 15 for LOIs [2021-11-21 01:50:56,457 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:50:57,285 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:50:57,285 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:50:57,286 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 26] total 51 [2021-11-21 01:50:57,286 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132038134] [2021-11-21 01:50:57,286 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:50:57,287 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-21 01:50:57,287 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:57,288 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-21 01:50:57,290 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1329, Invalid=2703, Unknown=0, NotChecked=0, Total=4032 [2021-11-21 01:50:57,291 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand has 51 states, 51 states have (on average 1.2745098039215685) internal successors, (65), 51 states have internal predecessors, (65), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:50:57,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:57,420 INFO L93 Difference]: Finished difference Result 100 states and 132 transitions. [2021-11-21 01:50:57,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-21 01:50:57,421 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.2745098039215685) internal successors, (65), 51 states have internal predecessors, (65), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 75 [2021-11-21 01:50:57,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:57,426 INFO L225 Difference]: With dead ends: 100 [2021-11-21 01:50:57,426 INFO L226 Difference]: Without dead ends: 75 [2021-11-21 01:50:57,429 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 187 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1061 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1329, Invalid=2703, Unknown=0, NotChecked=0, Total=4032 [2021-11-21 01:50:57,433 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:57,434 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 84 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:50:57,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-21 01:50:57,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-11-21 01:50:57,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:50:57,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 79 transitions. [2021-11-21 01:50:57,462 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 79 transitions. Word has length 75 [2021-11-21 01:50:57,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:57,465 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 79 transitions. [2021-11-21 01:50:57,465 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.2745098039215685) internal successors, (65), 51 states have internal predecessors, (65), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:50:57,466 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 79 transitions. [2021-11-21 01:50:57,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-21 01:50:57,474 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:57,474 INFO L514 BasicCegarLoop]: trace histogram [48, 30, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:50:57,521 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:57,692 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:57,692 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:57,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:57,692 INFO L85 PathProgramCache]: Analyzing trace with hash 1436572317, now seen corresponding path program 7 times [2021-11-21 01:50:57,693 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:57,693 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [303313311] [2021-11-21 01:50:57,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:57,693 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:57,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:59,235 INFO L134 CoverageAnalysis]: Checked inductivity of 1713 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2021-11-21 01:50:59,235 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:59,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [303313311] [2021-11-21 01:50:59,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [303313311] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:59,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1246697434] [2021-11-21 01:50:59,236 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:50:59,236 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:59,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:59,237 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:59,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 01:50:59,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:59,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-21 01:50:59,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:59,667 INFO L134 CoverageAnalysis]: Checked inductivity of 1713 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2021-11-21 01:50:59,667 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:51:02,840 INFO L134 CoverageAnalysis]: Checked inductivity of 1713 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2021-11-21 01:51:02,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1246697434] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:51:02,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1499873575] [2021-11-21 01:51:02,843 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:51:02,843 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:51:02,843 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:51:02,844 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:51:02,844 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:51:02,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:02,867 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:02,881 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 01:51:02,882 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-21 01:51:02,917 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:02,917 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 01:51:02,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:02,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:02,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 23 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 83 treesize of output 106 [2021-11-21 01:51:03,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:03,087 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:03,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:03,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:03,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:03,092 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:51:03,136 INFO L354 Elim1Store]: treesize reduction 138, result has 20.2 percent of original size [2021-11-21 01:51:03,136 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 26 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 13 case distinctions, treesize of input 284 treesize of output 276 [2021-11-21 01:51:03,482 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:51:03,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:03,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-21 01:51:03,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:03,999 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:04,000 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:51:04,001 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 27 [2021-11-21 01:51:04,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:04,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:04,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:04,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:04,095 INFO L354 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2021-11-21 01:51:04,096 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 3 case distinctions, treesize of input 62 treesize of output 54 [2021-11-21 01:51:04,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:04,180 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 01:51:04,209 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 01:51:04,562 INFO L197 IcfgInterpreter]: Interpreting procedure bor with input of size 15 for LOIs [2021-11-21 01:51:04,713 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:51:05,554 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:51:05,554 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:51:05,555 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 51] total 101 [2021-11-21 01:51:05,555 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1906135048] [2021-11-21 01:51:05,555 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:51:05,556 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2021-11-21 01:51:05,556 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:51:05,558 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2021-11-21 01:51:05,562 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5101, Invalid=7781, Unknown=0, NotChecked=0, Total=12882 [2021-11-21 01:51:05,563 INFO L87 Difference]: Start difference. First operand 75 states and 79 transitions. Second operand has 101 states, 101 states have (on average 1.1386138613861385) internal successors, (115), 101 states have internal predecessors, (115), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:51:05,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:51:05,762 INFO L93 Difference]: Finished difference Result 150 states and 207 transitions. [2021-11-21 01:51:05,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-11-21 01:51:05,763 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 1.1386138613861385) internal successors, (115), 101 states have internal predecessors, (115), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 100 [2021-11-21 01:51:05,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:51:05,765 INFO L225 Difference]: With dead ends: 150 [2021-11-21 01:51:05,765 INFO L226 Difference]: Without dead ends: 125 [2021-11-21 01:51:05,773 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 237 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2138 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=5101, Invalid=7781, Unknown=0, NotChecked=0, Total=12882 [2021-11-21 01:51:05,774 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:51:05,775 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 48 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:51:05,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-11-21 01:51:05,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2021-11-21 01:51:05,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 120 states have (on average 1.025) internal successors, (123), 120 states have internal predecessors, (123), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:51:05,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 129 transitions. [2021-11-21 01:51:05,810 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 129 transitions. Word has length 100 [2021-11-21 01:51:05,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:51:05,811 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 129 transitions. [2021-11-21 01:51:05,811 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 1.1386138613861385) internal successors, (115), 101 states have internal predecessors, (115), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:51:05,811 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 129 transitions. [2021-11-21 01:51:05,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2021-11-21 01:51:05,815 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:51:05,815 INFO L514 BasicCegarLoop]: trace histogram [98, 30, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:51:05,850 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 01:51:06,042 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:51:06,042 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:51:06,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:51:06,042 INFO L85 PathProgramCache]: Analyzing trace with hash 1773791133, now seen corresponding path program 8 times [2021-11-21 01:51:06,043 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:51:06,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [846400385] [2021-11-21 01:51:06,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:51:06,043 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:51:06,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:51:09,631 INFO L134 CoverageAnalysis]: Checked inductivity of 5388 backedges. 0 proven. 4851 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2021-11-21 01:51:09,632 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:51:09,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [846400385] [2021-11-21 01:51:09,632 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [846400385] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:51:09,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [199570995] [2021-11-21 01:51:09,632 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:51:09,633 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:51:09,633 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:51:09,633 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:51:09,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 01:51:09,705 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:51:09,706 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:51:09,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:51:09,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:51:10,026 INFO L134 CoverageAnalysis]: Checked inductivity of 5388 backedges. 246 proven. 3 refuted. 0 times theorem prover too weak. 5139 trivial. 0 not checked. [2021-11-21 01:51:10,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:51:10,358 INFO L134 CoverageAnalysis]: Checked inductivity of 5388 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 5385 trivial. 0 not checked. [2021-11-21 01:51:10,358 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [199570995] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:51:10,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1895686360] [2021-11-21 01:51:10,360 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:51:10,360 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:51:10,361 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:51:10,361 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:51:10,361 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:51:10,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:10,398 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 01:51:10,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-21 01:51:10,432 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:10,433 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:10,448 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 01:51:10,449 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-21 01:51:10,498 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:10,500 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:10,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 23 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 111 [2021-11-21 01:51:10,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:10,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:10,648 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:10,649 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:10,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:10,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:10,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:10,654 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:10,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:10,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:10,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:10,685 INFO L354 Elim1Store]: treesize reduction 153, result has 12.6 percent of original size [2021-11-21 01:51:10,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 12 case distinctions, treesize of input 294 treesize of output 275 [2021-11-21 01:51:10,863 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:51:11,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:11,060 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-21 01:51:11,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:11,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:11,288 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:51:11,289 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 27 [2021-11-21 01:51:11,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:11,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:11,345 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:11,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:11,356 INFO L354 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2021-11-21 01:51:11,357 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 3 case distinctions, treesize of input 62 treesize of output 54 [2021-11-21 01:51:11,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:11,410 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 01:51:11,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 01:51:11,845 INFO L197 IcfgInterpreter]: Interpreting procedure bor with input of size 15 for LOIs [2021-11-21 01:51:12,010 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:51:13,022 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:51:13,022 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:51:13,022 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 5, 5] total 107 [2021-11-21 01:51:13,023 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083212486] [2021-11-21 01:51:13,023 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:51:13,023 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2021-11-21 01:51:13,024 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:51:13,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2021-11-21 01:51:13,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5128, Invalid=9152, Unknown=0, NotChecked=0, Total=14280 [2021-11-21 01:51:13,030 INFO L87 Difference]: Start difference. First operand 125 states and 129 transitions. Second operand has 107 states, 107 states have (on average 1.1682242990654206) internal successors, (125), 107 states have internal predecessors, (125), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-21 01:51:13,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:51:13,177 INFO L93 Difference]: Finished difference Result 155 states and 167 transitions. [2021-11-21 01:51:13,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2021-11-21 01:51:13,178 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 1.1682242990654206) internal successors, (125), 107 states have internal predecessors, (125), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 150 [2021-11-21 01:51:13,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:51:13,180 INFO L225 Difference]: With dead ends: 155 [2021-11-21 01:51:13,180 INFO L226 Difference]: Without dead ends: 130 [2021-11-21 01:51:13,182 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 549 GetRequests, 431 SyntacticMatches, 0 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1988 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=5128, Invalid=9152, Unknown=0, NotChecked=0, Total=14280 [2021-11-21 01:51:13,183 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 145 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 145 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:51:13,184 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 81 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 145 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:51:13,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-21 01:51:13,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2021-11-21 01:51:13,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 125 states have (on average 1.024) internal successors, (128), 125 states have internal predecessors, (128), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:51:13,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 134 transitions. [2021-11-21 01:51:13,192 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 134 transitions. Word has length 150 [2021-11-21 01:51:13,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:51:13,193 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 134 transitions. [2021-11-21 01:51:13,193 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 1.1682242990654206) internal successors, (125), 107 states have internal predecessors, (125), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-21 01:51:13,194 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 134 transitions. [2021-11-21 01:51:13,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-11-21 01:51:13,196 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:51:13,196 INFO L514 BasicCegarLoop]: trace histogram [99, 30, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:51:13,221 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 01:51:13,410 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-21 01:51:13,410 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:51:13,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:51:13,410 INFO L85 PathProgramCache]: Analyzing trace with hash -1239752187, now seen corresponding path program 9 times [2021-11-21 01:51:13,411 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:51:13,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296394453] [2021-11-21 01:51:13,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:51:13,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:51:13,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:51:17,088 INFO L134 CoverageAnalysis]: Checked inductivity of 5505 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2021-11-21 01:51:17,088 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:51:17,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [296394453] [2021-11-21 01:51:17,089 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [296394453] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:51:17,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [961989840] [2021-11-21 01:51:17,089 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:51:17,089 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:51:17,090 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:51:17,095 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:51:17,096 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 01:51:17,262 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:51:17,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:51:17,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 834 conjuncts, 101 conjunts are in the unsatisfiable core [2021-11-21 01:51:17,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:51:17,645 INFO L134 CoverageAnalysis]: Checked inductivity of 5505 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2021-11-21 01:51:17,645 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:51:27,472 INFO L134 CoverageAnalysis]: Checked inductivity of 5505 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2021-11-21 01:51:27,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [961989840] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:51:27,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1147476385] [2021-11-21 01:51:27,474 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:51:27,474 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:51:27,475 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:51:27,475 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:51:27,475 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:51:27,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:27,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:27,508 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 01:51:27,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-21 01:51:27,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:27,535 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 01:51:27,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:27,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:27,600 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 23 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 111 [2021-11-21 01:51:27,704 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:27,707 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:27,708 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:27,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:27,711 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:27,712 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:27,714 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:27,715 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:27,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:27,717 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:27,717 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:27,746 INFO L354 Elim1Store]: treesize reduction 153, result has 12.6 percent of original size [2021-11-21 01:51:27,746 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 12 case distinctions, treesize of input 294 treesize of output 275 [2021-11-21 01:51:27,909 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:51:28,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:28,118 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-21 01:51:28,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:28,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:28,374 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:51:28,375 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 27 [2021-11-21 01:51:28,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:28,463 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:28,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:28,465 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:28,474 INFO L354 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2021-11-21 01:51:28,474 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 3 case distinctions, treesize of input 62 treesize of output 54 [2021-11-21 01:51:28,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:28,524 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 01:51:28,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 01:51:28,898 INFO L197 IcfgInterpreter]: Interpreting procedure bor with input of size 15 for LOIs [2021-11-21 01:51:29,084 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:51:30,194 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:51:30,194 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:51:30,195 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 101, 102] total 203 [2021-11-21 01:51:30,195 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972752894] [2021-11-21 01:51:30,195 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:51:30,196 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 203 states [2021-11-21 01:51:30,196 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:51:30,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 203 interpolants. [2021-11-21 01:51:30,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20554, Invalid=25886, Unknown=0, NotChecked=0, Total=46440 [2021-11-21 01:51:30,205 INFO L87 Difference]: Start difference. First operand 130 states and 134 transitions. Second operand has 203 states, 203 states have (on average 1.0689655172413792) internal successors, (217), 203 states have internal predecessors, (217), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:51:30,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:51:30,695 INFO L93 Difference]: Finished difference Result 260 states and 368 transitions. [2021-11-21 01:51:30,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 202 states. [2021-11-21 01:51:30,696 INFO L78 Accepts]: Start accepts. Automaton has has 203 states, 203 states have (on average 1.0689655172413792) internal successors, (217), 203 states have internal predecessors, (217), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 155 [2021-11-21 01:51:30,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:51:30,698 INFO L225 Difference]: With dead ends: 260 [2021-11-21 01:51:30,698 INFO L226 Difference]: Without dead ends: 231 [2021-11-21 01:51:30,702 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 565 GetRequests, 351 SyntacticMatches, 0 SemanticMatches, 214 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4331 ImplicationChecksByTransitivity, 13.9s TimeCoverageRelationStatistics Valid=20554, Invalid=25886, Unknown=0, NotChecked=0, Total=46440 [2021-11-21 01:51:30,703 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 228 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 228 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:51:30,703 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 60 Invalid, 333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 228 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:51:30,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2021-11-21 01:51:30,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 231. [2021-11-21 01:51:30,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 231 states, 226 states have (on average 1.0132743362831858) internal successors, (229), 226 states have internal predecessors, (229), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:51:30,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 235 transitions. [2021-11-21 01:51:30,715 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 235 transitions. Word has length 155 [2021-11-21 01:51:30,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:51:30,716 INFO L470 AbstractCegarLoop]: Abstraction has 231 states and 235 transitions. [2021-11-21 01:51:30,716 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 203 states, 203 states have (on average 1.0689655172413792) internal successors, (217), 203 states have internal predecessors, (217), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:51:30,717 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 235 transitions. [2021-11-21 01:51:30,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 257 [2021-11-21 01:51:30,720 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:51:30,720 INFO L514 BasicCegarLoop]: trace histogram [200, 30, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:51:30,752 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 01:51:30,938 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-21 01:51:30,938 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:51:30,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:51:30,939 INFO L85 PathProgramCache]: Analyzing trace with hash -2122053027, now seen corresponding path program 10 times [2021-11-21 01:51:30,939 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:51:30,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1699748638] [2021-11-21 01:51:30,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:51:30,939 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:51:31,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:51:44,174 INFO L134 CoverageAnalysis]: Checked inductivity of 20655 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2021-11-21 01:51:44,175 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:51:44,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1699748638] [2021-11-21 01:51:44,175 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1699748638] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:51:44,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1878068192] [2021-11-21 01:51:44,176 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:51:44,176 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:51:44,176 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:51:44,178 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:51:44,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 01:51:44,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:51:44,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 1440 conjuncts, 202 conjunts are in the unsatisfiable core [2021-11-21 01:51:44,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:51:45,005 INFO L134 CoverageAnalysis]: Checked inductivity of 20655 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2021-11-21 01:51:45,005 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:52:23,854 INFO L134 CoverageAnalysis]: Checked inductivity of 20655 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2021-11-21 01:52:23,854 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1878068192] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:52:23,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1061065187] [2021-11-21 01:52:23,857 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:52:23,857 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:52:23,857 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:52:23,858 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:52:23,858 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:52:23,894 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:23,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:23,907 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 01:52:23,908 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-21 01:52:23,926 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:23,927 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 01:52:23,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:23,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:23,985 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 23 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 83 treesize of output 106 [2021-11-21 01:52:24,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:24,093 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:24,094 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:24,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:24,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:24,098 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:24,142 INFO L354 Elim1Store]: treesize reduction 138, result has 20.2 percent of original size [2021-11-21 01:52:24,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 26 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 13 case distinctions, treesize of input 284 treesize of output 276 [2021-11-21 01:52:24,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:52:24,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:24,846 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-21 01:52:25,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:25,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:25,076 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:25,076 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 27 [2021-11-21 01:52:25,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:25,140 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:25,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:25,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:25,155 INFO L354 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2021-11-21 01:52:25,155 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 3 case distinctions, treesize of input 62 treesize of output 54 [2021-11-21 01:52:25,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:25,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 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 01:52:25,331 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 01:52:25,663 INFO L197 IcfgInterpreter]: Interpreting procedure bor with input of size 15 for LOIs [2021-11-21 01:52:25,805 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:52:27,636 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:52:27,636 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:52:27,637 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [203, 202, 203] total 405 [2021-11-21 01:52:27,637 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22609665] [2021-11-21 01:52:27,637 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:52:27,638 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 405 states [2021-11-21 01:52:27,638 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:52:27,677 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 405 interpolants. [2021-11-21 01:52:27,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81861, Invalid=92445, Unknown=0, NotChecked=0, Total=174306 [2021-11-21 01:52:27,685 INFO L87 Difference]: Start difference. First operand 231 states and 235 transitions. Second operand has 405 states, 405 states have (on average 1.0345679012345679) internal successors, (419), 405 states have internal predecessors, (419), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:52:29,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:52:29,655 INFO L93 Difference]: Finished difference Result 462 states and 671 transitions. [2021-11-21 01:52:29,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 404 states. [2021-11-21 01:52:29,656 INFO L78 Accepts]: Start accepts. Automaton has has 405 states, 405 states have (on average 1.0345679012345679) internal successors, (419), 405 states have internal predecessors, (419), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 256 [2021-11-21 01:52:29,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:52:29,659 INFO L225 Difference]: With dead ends: 462 [2021-11-21 01:52:29,659 INFO L226 Difference]: Without dead ends: 433 [2021-11-21 01:52:29,667 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 969 GetRequests, 553 SyntacticMatches, 0 SemanticMatches, 416 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8674 ImplicationChecksByTransitivity, 52.6s TimeCoverageRelationStatistics Valid=81861, Invalid=92445, Unknown=0, NotChecked=0, Total=174306 [2021-11-21 01:52:29,667 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 444 mSolverCounterSat, 209 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 653 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 209 IncrementalHoareTripleChecker+Valid, 444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:52:29,668 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 96 Invalid, 653 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [209 Valid, 444 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:52:29,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 433 states. [2021-11-21 01:52:29,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 433 to 433. [2021-11-21 01:52:29,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 433 states, 428 states have (on average 1.0070093457943925) internal successors, (431), 428 states have internal predecessors, (431), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:52:29,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 437 transitions. [2021-11-21 01:52:29,686 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 437 transitions. Word has length 256 [2021-11-21 01:52:29,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:52:29,687 INFO L470 AbstractCegarLoop]: Abstraction has 433 states and 437 transitions. [2021-11-21 01:52:29,688 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 405 states, 405 states have (on average 1.0345679012345679) internal successors, (419), 405 states have internal predecessors, (419), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:52:29,688 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 437 transitions. [2021-11-21 01:52:29,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 459 [2021-11-21 01:52:29,697 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:52:29,697 INFO L514 BasicCegarLoop]: trace histogram [402, 30, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:52:29,734 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 01:52:29,910 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:52:29,910 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:52:29,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:52:29,911 INFO L85 PathProgramCache]: Analyzing trace with hash 1384698717, now seen corresponding path program 11 times [2021-11-21 01:52:29,911 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:52:29,911 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2145516965] [2021-11-21 01:52:29,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:52:29,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:52:31,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:53:24,404 INFO L134 CoverageAnalysis]: Checked inductivity of 81558 backedges. 0 proven. 81003 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2021-11-21 01:53:24,405 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:53:24,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2145516965] [2021-11-21 01:53:24,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2145516965] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:53:24,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [496462880] [2021-11-21 01:53:24,405 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:53:24,406 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:53:24,406 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:53:24,427 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:53:24,453 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 01:53:24,634 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-21 01:53:24,634 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:53:24,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 01:53:24,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:53:26,146 INFO L134 CoverageAnalysis]: Checked inductivity of 81558 backedges. 246 proven. 21 refuted. 0 times theorem prover too weak. 81291 trivial. 0 not checked. [2021-11-21 01:53:26,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:53:27,601 INFO L134 CoverageAnalysis]: Checked inductivity of 81558 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 81537 trivial. 0 not checked. [2021-11-21 01:53:27,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [496462880] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:53:27,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [499035480] [2021-11-21 01:53:27,603 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:53:27,604 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:53:27,604 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:53:27,604 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:53:27,604 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:53:27,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:27,647 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 01:53:27,648 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-21 01:53:27,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:27,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 01:53:27,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:27,774 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:27,776 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 23 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 83 treesize of output 106 [2021-11-21 01:53:27,865 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:27,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:27,867 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:27,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:27,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:27,871 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:27,913 INFO L354 Elim1Store]: treesize reduction 138, result has 20.2 percent of original size [2021-11-21 01:53:27,914 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 26 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 13 case distinctions, treesize of input 284 treesize of output 276 [2021-11-21 01:53:28,339 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:53:28,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:28,543 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-21 01:53:28,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:28,757 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:28,757 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:28,758 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 27 [2021-11-21 01:53:28,799 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:28,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:28,801 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:28,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:28,811 INFO L354 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2021-11-21 01:53:28,811 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 3 case distinctions, treesize of input 62 treesize of output 54 [2021-11-21 01:53:28,885 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:28,886 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 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 01:53:28,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 01:53:29,291 INFO L197 IcfgInterpreter]: Interpreting procedure bor with input of size 15 for LOIs [2021-11-21 01:53:29,449 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:53:32,521 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:53:32,521 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:53:32,522 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [405, 9, 9] total 419 [2021-11-21 01:53:32,522 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209164385] [2021-11-21 01:53:32,522 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:53:32,523 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 419 states [2021-11-21 01:53:32,523 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:53:32,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 419 interpolants. [2021-11-21 01:53:32,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81980, Invalid=104212, Unknown=0, NotChecked=0, Total=186192 [2021-11-21 01:53:32,541 INFO L87 Difference]: Start difference. First operand 433 states and 437 transitions. Second operand has 419 states, 419 states have (on average 1.0429594272076372) internal successors, (437), 419 states have internal predecessors, (437), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-21 01:53:34,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:53:34,502 INFO L93 Difference]: Finished difference Result 471 states and 487 transitions. [2021-11-21 01:53:34,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 419 states. [2021-11-21 01:53:34,503 INFO L78 Accepts]: Start accepts. Automaton has has 419 states, 419 states have (on average 1.0429594272076372) internal successors, (437), 419 states have internal predecessors, (437), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 458 [2021-11-21 01:53:34,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:53:34,507 INFO L225 Difference]: With dead ends: 471 [2021-11-21 01:53:34,507 INFO L226 Difference]: Without dead ends: 442 [2021-11-21 01:53:34,518 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1777 GetRequests, 1347 SyntacticMatches, 0 SemanticMatches, 430 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11136 ImplicationChecksByTransitivity, 57.4s TimeCoverageRelationStatistics Valid=81980, Invalid=104212, Unknown=0, NotChecked=0, Total=186192 [2021-11-21 01:53:34,519 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 490 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 504 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 490 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:53:34,520 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 150 Invalid, 504 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 490 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:53:34,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2021-11-21 01:53:34,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 442. [2021-11-21 01:53:34,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 442 states, 437 states have (on average 1.0068649885583525) internal successors, (440), 437 states have internal predecessors, (440), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:53:34,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 442 states to 442 states and 446 transitions. [2021-11-21 01:53:34,605 INFO L78 Accepts]: Start accepts. Automaton has 442 states and 446 transitions. Word has length 458 [2021-11-21 01:53:34,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:53:34,606 INFO L470 AbstractCegarLoop]: Abstraction has 442 states and 446 transitions. [2021-11-21 01:53:34,607 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 419 states, 419 states have (on average 1.0429594272076372) internal successors, (437), 419 states have internal predecessors, (437), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-21 01:53:34,607 INFO L276 IsEmpty]: Start isEmpty. Operand 442 states and 446 transitions. [2021-11-21 01:53:34,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2021-11-21 01:53:34,617 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:53:34,618 INFO L514 BasicCegarLoop]: trace histogram [403, 30, 14, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:53:34,656 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 01:53:34,841 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-21 01:53:34,842 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:53:34,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:53:34,842 INFO L85 PathProgramCache]: Analyzing trace with hash -1722644091, now seen corresponding path program 12 times [2021-11-21 01:53:34,842 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:53:34,842 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1091262375] [2021-11-21 01:53:34,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:53:34,842 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:53:35,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:54:27,403 INFO L134 CoverageAnalysis]: Checked inductivity of 82045 backedges. 0 proven. 81406 refuted. 0 times theorem prover too weak. 639 trivial. 0 not checked. [2021-11-21 01:54:27,403 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:54:27,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1091262375] [2021-11-21 01:54:27,404 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1091262375] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:54:27,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2032300255] [2021-11-21 01:54:27,404 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:54:27,404 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:54:27,404 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:54:27,405 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:54:27,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-21 01:54:27,794 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:54:27,794 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:54:27,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 2690 conjuncts, 405 conjunts are in the unsatisfiable core [2021-11-21 01:54:27,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:54:28,758 INFO L134 CoverageAnalysis]: Checked inductivity of 82045 backedges. 0 proven. 81406 refuted. 0 times theorem prover too weak. 639 trivial. 0 not checked. [2021-11-21 01:54:28,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:57:05,683 INFO L134 CoverageAnalysis]: Checked inductivity of 82045 backedges. 0 proven. 81406 refuted. 0 times theorem prover too weak. 639 trivial. 0 not checked. [2021-11-21 01:57:05,683 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2032300255] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:57:05,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1183971048] [2021-11-21 01:57:05,685 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:57:05,685 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:57:05,685 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:57:05,685 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:57:05,686 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:57:05,705 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:57:05,706 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:57:05,717 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 01:57:05,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-21 01:57:05,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:57:05,748 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 01:57:05,799 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:57:05,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:57:05,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 23 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 83 treesize of output 106 [2021-11-21 01:57:05,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:57:05,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:57:05,885 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:57:05,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:57:05,887 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:57:05,888 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:57:05,922 INFO L354 Elim1Store]: treesize reduction 138, result has 20.2 percent of original size [2021-11-21 01:57:05,922 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 26 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 13 case distinctions, treesize of input 284 treesize of output 276 [2021-11-21 01:57:06,236 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:57:06,453 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:57:06,454 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-21 01:57:06,670 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:57:06,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 20 [2021-11-21 01:57:06,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:57:06,711 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:57:06,712 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:57:06,732 INFO L354 Elim1Store]: treesize reduction 65, result has 27.0 percent of original size [2021-11-21 01:57:06,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 54 treesize of output 62 [2021-11-21 01:57:06,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:57:06,803 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 01:57:06,841 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 01:57:07,215 INFO L197 IcfgInterpreter]: Interpreting procedure bor with input of size 15 for LOIs [2021-11-21 01:57:07,396 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:57:11,208 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:57:11,209 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:57:11,210 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [406, 405, 406] total 811 [2021-11-21 01:57:11,210 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [397513373] [2021-11-21 01:57:11,210 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:57:11,212 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 811 states [2021-11-21 01:57:11,212 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:57:11,276 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 811 interpolants. [2021-11-21 01:57:11,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=328510, Invalid=349642, Unknown=0, NotChecked=0, Total=678152 [2021-11-21 01:57:11,309 INFO L87 Difference]: Start difference. First operand 442 states and 446 transitions. Second operand has 811 states, 811 states have (on average 1.0172626387176325) internal successors, (825), 811 states have internal predecessors, (825), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:57:25,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:57:25,458 INFO L93 Difference]: Finished difference Result 884 states and 1296 transitions. [2021-11-21 01:57:25,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 810 states. [2021-11-21 01:57:25,460 INFO L78 Accepts]: Start accepts. Automaton has has 811 states, 811 states have (on average 1.0172626387176325) internal successors, (825), 811 states have internal predecessors, (825), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 467 [2021-11-21 01:57:25,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:57:25,465 INFO L225 Difference]: With dead ends: 884 [2021-11-21 01:57:25,466 INFO L226 Difference]: Without dead ends: 847 [2021-11-21 01:57:25,610 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1805 GetRequests, 983 SyntacticMatches, 0 SemanticMatches, 822 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17405 ImplicationChecksByTransitivity, 210.7s TimeCoverageRelationStatistics Valid=328510, Invalid=349642, Unknown=0, NotChecked=0, Total=678152 [2021-11-21 01:57:25,611 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 845 mSolverCounterSat, 411 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 1256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 411 IncrementalHoareTripleChecker+Valid, 845 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-21 01:57:25,611 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 84 Invalid, 1256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [411 Valid, 845 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-21 01:57:25,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 847 states. [2021-11-21 01:57:25,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 847 to 847. [2021-11-21 01:57:25,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 847 states, 842 states have (on average 1.003562945368171) internal successors, (845), 842 states have internal predecessors, (845), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:57:25,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 847 states to 847 states and 851 transitions. [2021-11-21 01:57:25,645 INFO L78 Accepts]: Start accepts. Automaton has 847 states and 851 transitions. Word has length 467 [2021-11-21 01:57:25,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:57:25,646 INFO L470 AbstractCegarLoop]: Abstraction has 847 states and 851 transitions. [2021-11-21 01:57:25,647 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 811 states, 811 states have (on average 1.0172626387176325) internal successors, (825), 811 states have internal predecessors, (825), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:57:25,647 INFO L276 IsEmpty]: Start isEmpty. Operand 847 states and 851 transitions. [2021-11-21 01:57:25,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 873 [2021-11-21 01:57:25,654 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:57:25,655 INFO L514 BasicCegarLoop]: trace histogram [808, 30, 14, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:57:25,680 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2021-11-21 01:57:25,855 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-21 01:57:25,856 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:57:25,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:57:25,856 INFO L85 PathProgramCache]: Analyzing trace with hash -1210105379, now seen corresponding path program 13 times [2021-11-21 01:57:25,856 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:57:25,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1101709395] [2021-11-21 01:57:25,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:25,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:57:29,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:01:00,495 INFO L134 CoverageAnalysis]: Checked inductivity of 327475 backedges. 0 proven. 326836 refuted. 0 times theorem prover too weak. 639 trivial. 0 not checked. [2021-11-21 02:01:00,495 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:01:00,495 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1101709395] [2021-11-21 02:01:00,495 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1101709395] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 02:01:00,495 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [28901902] [2021-11-21 02:01:00,495 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 02:01:00,496 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:01:00,496 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:01:00,497 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:01:00,497 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa1ea7a9-4b41-47ac-b7bf-dce2d28a4ff3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-21 02:01:01,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:01:01,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 5120 conjuncts, 810 conjunts are in the unsatisfiable core [2021-11-21 02:01:01,336 INFO L286 TraceCheckSpWp]: Computing forward predicates...