./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/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_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/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_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/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 1aca3c96522e618238f11f200c96e0ec490e756d4e04895bd2a51f9a4ff85af1 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:21:52,378 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:21:52,382 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:21:52,438 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:21:52,438 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:21:52,443 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:21:52,445 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:21:52,449 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:21:52,451 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:21:52,457 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:21:52,458 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:21:52,460 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:21:52,460 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:21:52,463 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:21:52,465 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:21:52,473 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:21:52,475 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:21:52,476 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:21:52,478 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:21:52,486 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:21:52,488 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:21:52,489 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:21:52,493 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:21:52,494 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:21:52,503 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:21:52,503 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:21:52,504 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:21:52,506 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:21:52,507 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:21:52,508 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:21:52,509 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:21:52,510 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:21:52,512 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:21:52,513 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:21:52,514 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:21:52,515 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:21:52,515 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:21:52,516 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:21:52,516 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:21:52,517 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:21:52,517 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:21:52,518 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 00:21:52,543 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:21:52,543 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:21:52,543 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:21:52,544 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:21:52,544 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:21:52,544 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:21:52,545 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:21:52,545 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:21:52,545 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:21:52,545 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:21:52,545 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:21:52,546 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:21:52,546 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:21:52,546 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:21:52,546 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:21:52,546 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:21:52,547 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:21:52,547 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:21:52,547 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:21:52,548 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:21:52,548 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:21:52,548 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:21:52,548 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:21:52,548 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 00:21:52,549 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:21:52,549 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 00:21:52,549 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:21:52,549 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 00:21:52,549 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:21:52,550 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 00:21:52,550 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:21:52,550 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:21:52,550 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:21:52,550 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:21:52,551 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:21:52,551 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 00:21:52,551 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:21:52,551 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:21:52,551 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 00:21:52,551 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:21:52,552 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:21:52,552 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_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1aca3c96522e618238f11f200c96e0ec490e756d4e04895bd2a51f9a4ff85af1 [2021-11-21 00:21:52,805 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:21:52,826 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:21:52,829 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:21:52,830 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:21:52,831 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:21:52,832 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c [2021-11-21 00:21:52,904 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/data/4b4045c79/08cce72b42514dd9b66b82ef713cf8e9/FLAG8f0848006 [2021-11-21 00:21:53,480 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:21:53,485 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c [2021-11-21 00:21:53,498 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/data/4b4045c79/08cce72b42514dd9b66b82ef713cf8e9/FLAG8f0848006 [2021-11-21 00:21:53,847 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/data/4b4045c79/08cce72b42514dd9b66b82ef713cf8e9 [2021-11-21 00:21:53,850 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:21:53,851 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:21:53,853 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:21:53,854 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:21:53,858 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:21:53,859 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:21:53" (1/1) ... [2021-11-21 00:21:53,860 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@75fbb7ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:53, skipping insertion in model container [2021-11-21 00:21:53,860 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:21:53" (1/1) ... [2021-11-21 00:21:53,869 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:21:53,888 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:21:54,125 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_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c[490,503] [2021-11-21 00:21:54,147 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:21:54,161 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:21:54,177 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_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c[490,503] [2021-11-21 00:21:54,207 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:21:54,221 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:21:54,222 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:54 WrapperNode [2021-11-21 00:21:54,222 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:21:54,223 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:21:54,223 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:21:54,223 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:21:54,232 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:54" (1/1) ... [2021-11-21 00:21:54,239 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:54" (1/1) ... [2021-11-21 00:21:54,260 INFO L137 Inliner]: procedures = 14, calls = 16, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 80 [2021-11-21 00:21:54,260 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:21:54,261 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:21:54,261 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:21:54,261 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:21:54,270 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:54" (1/1) ... [2021-11-21 00:21:54,270 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:54" (1/1) ... [2021-11-21 00:21:54,272 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:54" (1/1) ... [2021-11-21 00:21:54,272 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:54" (1/1) ... [2021-11-21 00:21:54,277 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:54" (1/1) ... [2021-11-21 00:21:54,281 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:54" (1/1) ... [2021-11-21 00:21:54,283 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:54" (1/1) ... [2021-11-21 00:21:54,285 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:21:54,286 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:21:54,286 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:21:54,286 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:21:54,287 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:54" (1/1) ... [2021-11-21 00:21:54,302 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:21:54,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:21:54,327 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:21:54,340 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:21:54,375 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:21:54,377 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-21 00:21:54,377 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-21 00:21:54,377 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 00:21:54,377 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:21:54,377 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:21:54,377 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-21 00:21:54,377 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-21 00:21:54,458 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:21:54,460 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:21:54,657 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:21:54,693 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:21:54,693 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-21 00:21:54,696 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:21:54 BoogieIcfgContainer [2021-11-21 00:21:54,696 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:21:54,698 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:21:54,698 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:21:54,702 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:21:54,702 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:21:53" (1/3) ... [2021-11-21 00:21:54,703 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56a8fd0d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:21:54, skipping insertion in model container [2021-11-21 00:21:54,703 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:54" (2/3) ... [2021-11-21 00:21:54,704 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56a8fd0d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:21:54, skipping insertion in model container [2021-11-21 00:21:54,704 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:21:54" (3/3) ... [2021-11-21 00:21:54,705 INFO L111 eAbstractionObserver]: Analyzing ICFG egcd3-ll_valuebound5.c [2021-11-21 00:21:54,710 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:21:54,711 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 00:21:54,774 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:21:54,781 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 00:21:54,782 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 00:21:54,819 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 18 states have internal predecessors, (25), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-21 00:21:54,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-21 00:21:54,832 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:54,833 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:21:54,834 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:21:54,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:54,841 INFO L85 PathProgramCache]: Analyzing trace with hash 1539547475, now seen corresponding path program 1 times [2021-11-21 00:21:54,851 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:54,853 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1462348388] [2021-11-21 00:21:54,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:54,854 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:55,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:55,089 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:21:55,089 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:55,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1462348388] [2021-11-21 00:21:55,092 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1462348388] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:21:55,093 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:21:55,093 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:21:55,096 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1339945668] [2021-11-21 00:21:55,097 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:21:55,102 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-21 00:21:55,103 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:55,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-21 00:21:55,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-21 00:21:55,145 INFO L87 Difference]: Start difference. First operand has 30 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 18 states have internal predecessors, (25), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-21 00:21:55,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:55,202 INFO L93 Difference]: Finished difference Result 51 states and 79 transitions. [2021-11-21 00:21:55,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-21 00:21:55,208 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 20 [2021-11-21 00:21:55,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:55,217 INFO L225 Difference]: With dead ends: 51 [2021-11-21 00:21:55,217 INFO L226 Difference]: Without dead ends: 28 [2021-11-21 00:21:55,221 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-21 00:21:55,227 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:55,228 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:21:55,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-21 00:21:55,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-21 00:21:55,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-21 00:21:55,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 37 transitions. [2021-11-21 00:21:55,285 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 37 transitions. Word has length 20 [2021-11-21 00:21:55,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:55,288 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 37 transitions. [2021-11-21 00:21:55,289 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-21 00:21:55,289 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 37 transitions. [2021-11-21 00:21:55,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-21 00:21:55,292 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:55,292 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:21:55,293 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:21:55,294 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:21:55,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:55,301 INFO L85 PathProgramCache]: Analyzing trace with hash 1863391506, now seen corresponding path program 1 times [2021-11-21 00:21:55,301 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:55,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [664467928] [2021-11-21 00:21:55,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:55,302 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:55,353 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:21:55,353 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [16355678] [2021-11-21 00:21:55,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:55,354 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:21:55,354 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:21:55,365 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:21:55,387 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:21:55,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:55,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 00:21:55,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:21:55,628 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 00:21:55,628 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:21:55,629 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:55,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [664467928] [2021-11-21 00:21:55,629 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:21:55,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [16355678] [2021-11-21 00:21:55,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [16355678] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:21:55,630 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:21:55,630 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 00:21:55,631 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1868004719] [2021-11-21 00:21:55,632 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:21:55,632 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:21:55,633 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:55,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:21:55,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:21:55,634 INFO L87 Difference]: Start difference. First operand 28 states and 37 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-21 00:21:55,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:55,733 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2021-11-21 00:21:55,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:21:55,734 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 21 [2021-11-21 00:21:55,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:55,735 INFO L225 Difference]: With dead ends: 47 [2021-11-21 00:21:55,736 INFO L226 Difference]: Without dead ends: 40 [2021-11-21 00:21:55,736 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:21:55,738 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 29 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:55,739 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 95 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:21:55,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-21 00:21:55,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 30. [2021-11-21 00:21:55,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-21 00:21:55,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2021-11-21 00:21:55,751 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 21 [2021-11-21 00:21:55,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:55,752 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2021-11-21 00:21:55,752 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-21 00:21:55,752 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2021-11-21 00:21:55,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-21 00:21:55,753 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:55,754 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:21:55,780 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-21 00:21:55,963 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:21:55,964 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:21:55,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:55,965 INFO L85 PathProgramCache]: Analyzing trace with hash -73319670, now seen corresponding path program 1 times [2021-11-21 00:21:55,965 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:55,965 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1992855916] [2021-11-21 00:21:55,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:55,965 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:55,980 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:21:55,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1940469688] [2021-11-21 00:21:55,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:55,981 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:21:55,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:21:55,982 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:21:55,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:21:56,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:56,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 00:21:56,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:21:56,201 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:21:56,201 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:21:56,201 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:56,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1992855916] [2021-11-21 00:21:56,202 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:21:56,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1940469688] [2021-11-21 00:21:56,203 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1940469688] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:21:56,203 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:21:56,203 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 00:21:56,203 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465711150] [2021-11-21 00:21:56,204 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:21:56,204 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:21:56,204 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:56,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:21:56,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:21:56,206 INFO L87 Difference]: Start difference. First operand 30 states and 39 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-21 00:21:56,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:56,278 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2021-11-21 00:21:56,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:21:56,279 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 24 [2021-11-21 00:21:56,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:56,281 INFO L225 Difference]: With dead ends: 46 [2021-11-21 00:21:56,281 INFO L226 Difference]: Without dead ends: 44 [2021-11-21 00:21:56,282 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:21:56,283 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 9 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:56,284 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 127 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:21:56,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-21 00:21:56,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2021-11-21 00:21:56,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-21 00:21:56,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 57 transitions. [2021-11-21 00:21:56,296 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 57 transitions. Word has length 24 [2021-11-21 00:21:56,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:56,297 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 57 transitions. [2021-11-21 00:21:56,297 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-21 00:21:56,297 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 57 transitions. [2021-11-21 00:21:56,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-21 00:21:56,299 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:56,299 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:21:56,327 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:21:56,512 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:21:56,513 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:21:56,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:56,513 INFO L85 PathProgramCache]: Analyzing trace with hash -1101454984, now seen corresponding path program 1 times [2021-11-21 00:21:56,514 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:56,514 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988611437] [2021-11-21 00:21:56,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:56,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:56,527 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:21:56,528 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [733832392] [2021-11-21 00:21:56,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:56,528 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:21:56,528 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:21:56,545 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:21:56,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:21:56,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:56,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 00:21:56,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:21:56,685 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 00:21:56,686 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:21:56,786 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 00:21:56,787 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:56,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1988611437] [2021-11-21 00:21:56,787 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:21:56,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [733832392] [2021-11-21 00:21:56,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [733832392] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:21:56,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [196464895] [2021-11-21 00:21:56,806 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-21 00:21:56,806 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:21:56,811 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:21:56,816 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:21:56,817 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:22:00,616 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 00:22:00,645 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:22:01,604 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [196464895] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:22:01,605 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:22:01,605 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [7, 7] total 18 [2021-11-21 00:22:01,605 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1673044049] [2021-11-21 00:22:01,606 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:22:01,606 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 00:22:01,606 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:01,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 00:22:01,607 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=223, Unknown=0, NotChecked=0, Total=306 [2021-11-21 00:22:01,607 INFO L87 Difference]: Start difference. First operand 43 states and 57 transitions. Second operand has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-21 00:22:01,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:01,883 INFO L93 Difference]: Finished difference Result 71 states and 97 transitions. [2021-11-21 00:22:01,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-21 00:22:01,883 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 26 [2021-11-21 00:22:01,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:01,885 INFO L225 Difference]: With dead ends: 71 [2021-11-21 00:22:01,885 INFO L226 Difference]: Without dead ends: 64 [2021-11-21 00:22:01,886 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 57 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=83, Invalid=223, Unknown=0, NotChecked=0, Total=306 [2021-11-21 00:22:01,887 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 45 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:01,887 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 49 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:22:01,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-21 00:22:01,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 50. [2021-11-21 00:22:01,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 34 states have internal predecessors, (41), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-21 00:22:01,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 66 transitions. [2021-11-21 00:22:01,905 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 66 transitions. Word has length 26 [2021-11-21 00:22:01,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:01,906 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 66 transitions. [2021-11-21 00:22:01,906 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-21 00:22:01,906 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 66 transitions. [2021-11-21 00:22:01,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-21 00:22:01,907 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:01,907 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:22:01,946 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:02,130 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:02,131 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:22:02,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:02,131 INFO L85 PathProgramCache]: Analyzing trace with hash -156943002, now seen corresponding path program 1 times [2021-11-21 00:22:02,131 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:02,132 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1096062423] [2021-11-21 00:22:02,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:02,132 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:02,147 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:22:02,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1866539906] [2021-11-21 00:22:02,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:02,148 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:02,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:02,149 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:02,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:22:02,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:02,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 00:22:02,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:02,361 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:22:02,361 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:22:02,361 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:02,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1096062423] [2021-11-21 00:22:02,362 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:22:02,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1866539906] [2021-11-21 00:22:02,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1866539906] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:22:02,362 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:22:02,362 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 00:22:02,363 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794218917] [2021-11-21 00:22:02,363 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:22:02,363 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:22:02,364 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:02,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:22:02,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:22:02,364 INFO L87 Difference]: Start difference. First operand 50 states and 66 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-21 00:22:02,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:02,427 INFO L93 Difference]: Finished difference Result 58 states and 73 transitions. [2021-11-21 00:22:02,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:22:02,428 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 29 [2021-11-21 00:22:02,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:02,429 INFO L225 Difference]: With dead ends: 58 [2021-11-21 00:22:02,429 INFO L226 Difference]: Without dead ends: 56 [2021-11-21 00:22:02,429 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:22:02,431 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 9 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:02,431 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 123 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:22:02,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-21 00:22:02,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 54. [2021-11-21 00:22:02,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 36 states have (on average 1.2222222222222223) internal successors, (44), 37 states have internal predecessors, (44), 13 states have call successors, (13), 4 states have call predecessors, (13), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-21 00:22:02,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 69 transitions. [2021-11-21 00:22:02,445 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 69 transitions. Word has length 29 [2021-11-21 00:22:02,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:02,446 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 69 transitions. [2021-11-21 00:22:02,446 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-21 00:22:02,446 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 69 transitions. [2021-11-21 00:22:02,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-21 00:22:02,447 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:02,448 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:22:02,487 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:02,674 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:02,674 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:22:02,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:02,675 INFO L85 PathProgramCache]: Analyzing trace with hash 187338980, now seen corresponding path program 1 times [2021-11-21 00:22:02,675 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:02,675 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1555450564] [2021-11-21 00:22:02,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:02,675 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:02,693 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:22:02,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1838384245] [2021-11-21 00:22:02,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:02,694 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:02,694 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:02,701 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:02,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 00:22:02,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:02,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-21 00:22:02,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:02,916 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:22:02,917 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:03,151 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:22:03,152 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:03,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1555450564] [2021-11-21 00:22:03,152 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:22:03,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1838384245] [2021-11-21 00:22:03,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1838384245] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:22:03,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1981181398] [2021-11-21 00:22:03,155 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-21 00:22:03,155 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:22:03,156 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:22:03,156 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:22:03,156 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:22:07,317 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2021-11-21 00:22:07,382 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 00:22:07,434 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:22:08,499 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1981181398] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:22:08,500 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:22:08,500 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [6, 6] total 22 [2021-11-21 00:22:08,500 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446186171] [2021-11-21 00:22:08,500 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:22:08,501 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-21 00:22:08,501 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:08,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-21 00:22:08,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=370, Unknown=0, NotChecked=0, Total=462 [2021-11-21 00:22:08,502 INFO L87 Difference]: Start difference. First operand 54 states and 69 transitions. Second operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-21 00:22:08,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:08,913 INFO L93 Difference]: Finished difference Result 96 states and 128 transitions. [2021-11-21 00:22:08,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 00:22:08,919 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 29 [2021-11-21 00:22:08,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:08,921 INFO L225 Difference]: With dead ends: 96 [2021-11-21 00:22:08,921 INFO L226 Difference]: Without dead ends: 94 [2021-11-21 00:22:08,922 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 62 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=92, Invalid=370, Unknown=0, NotChecked=0, Total=462 [2021-11-21 00:22:08,923 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 45 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 299 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:08,924 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 70 Invalid, 299 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:22:08,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-21 00:22:08,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 88. [2021-11-21 00:22:08,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 51 states have (on average 1.196078431372549) internal successors, (61), 54 states have internal predecessors, (61), 29 states have call successors, (29), 7 states have call predecessors, (29), 7 states have return successors, (28), 26 states have call predecessors, (28), 28 states have call successors, (28) [2021-11-21 00:22:08,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 118 transitions. [2021-11-21 00:22:08,952 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 118 transitions. Word has length 29 [2021-11-21 00:22:08,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:08,953 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 118 transitions. [2021-11-21 00:22:08,953 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-21 00:22:08,953 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 118 transitions. [2021-11-21 00:22:08,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-21 00:22:08,955 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:08,956 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:22:08,981 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:09,167 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:09,168 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:22:09,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:09,169 INFO L85 PathProgramCache]: Analyzing trace with hash -1193022788, now seen corresponding path program 1 times [2021-11-21 00:22:09,169 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:09,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1276900615] [2021-11-21 00:22:09,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:09,169 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:09,176 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:22:09,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [461632954] [2021-11-21 00:22:09,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:09,177 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:09,177 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:09,185 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:09,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 00:22:09,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:09,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-21 00:22:09,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:09,981 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 15 proven. 9 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-21 00:22:09,982 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:11,217 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 15 proven. 9 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-21 00:22:11,217 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:11,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1276900615] [2021-11-21 00:22:11,218 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:22:11,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [461632954] [2021-11-21 00:22:11,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [461632954] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:22:11,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [69163736] [2021-11-21 00:22:11,224 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-21 00:22:11,225 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:22:11,226 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:22:11,226 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:22:11,226 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:22:37,330 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 14 for LOIs [2021-11-21 00:22:37,400 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 00:22:37,425 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:22:41,160 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:22:41,160 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:22:41,161 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 23 [2021-11-21 00:22:41,161 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1935236236] [2021-11-21 00:22:41,161 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:22:41,162 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-21 00:22:41,162 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:41,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-21 00:22:41,164 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=1749, Unknown=0, NotChecked=0, Total=1980 [2021-11-21 00:22:41,164 INFO L87 Difference]: Start difference. First operand 88 states and 118 transitions. Second operand has 23 states, 20 states have (on average 2.0) internal successors, (40), 20 states have internal predecessors, (40), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-21 00:22:49,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:49,343 INFO L93 Difference]: Finished difference Result 229 states and 326 transitions. [2021-11-21 00:22:49,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-21 00:22:49,343 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 20 states have (on average 2.0) internal successors, (40), 20 states have internal predecessors, (40), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) Word has length 51 [2021-11-21 00:22:49,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:49,347 INFO L225 Difference]: With dead ends: 229 [2021-11-21 00:22:49,347 INFO L226 Difference]: Without dead ends: 191 [2021-11-21 00:22:49,350 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 106 SyntacticMatches, 2 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1606 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=740, Invalid=4960, Unknown=0, NotChecked=0, Total=5700 [2021-11-21 00:22:49,351 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 149 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 710 mSolverCounterSat, 345 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 285 SdHoareTripleChecker+Invalid, 1055 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 345 IncrementalHoareTripleChecker+Valid, 710 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:49,352 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [150 Valid, 285 Invalid, 1055 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [345 Valid, 710 Invalid, 0 Unknown, 0 Unchecked, 3.7s Time] [2021-11-21 00:22:49,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-11-21 00:22:49,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 140. [2021-11-21 00:22:49,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 89 states have (on average 1.202247191011236) internal successors, (107), 91 states have internal predecessors, (107), 41 states have call successors, (41), 9 states have call predecessors, (41), 9 states have return successors, (40), 39 states have call predecessors, (40), 40 states have call successors, (40) [2021-11-21 00:22:49,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 188 transitions. [2021-11-21 00:22:49,449 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 188 transitions. Word has length 51 [2021-11-21 00:22:49,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:49,449 INFO L470 AbstractCegarLoop]: Abstraction has 140 states and 188 transitions. [2021-11-21 00:22:49,450 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 20 states have (on average 2.0) internal successors, (40), 20 states have internal predecessors, (40), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-21 00:22:49,450 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 188 transitions. [2021-11-21 00:22:49,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-21 00:22:49,453 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:49,453 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:22:49,490 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:49,667 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-21 00:22:49,668 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:22:49,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:49,668 INFO L85 PathProgramCache]: Analyzing trace with hash -900294476, now seen corresponding path program 1 times [2021-11-21 00:22:49,668 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:49,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [532425699] [2021-11-21 00:22:49,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:49,669 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:49,675 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:22:49,675 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [272647760] [2021-11-21 00:22:49,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:49,675 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:49,676 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:49,677 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:49,691 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 00:22:49,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:49,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:22:49,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:49,839 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-21 00:22:49,840 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:22:49,840 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:49,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [532425699] [2021-11-21 00:22:49,840 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:22:49,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [272647760] [2021-11-21 00:22:49,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [272647760] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:22:49,840 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:22:49,840 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 00:22:49,841 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670194343] [2021-11-21 00:22:49,841 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:22:49,841 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:22:49,841 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:49,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:22:49,842 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:22:49,842 INFO L87 Difference]: Start difference. First operand 140 states and 188 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-21 00:22:49,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:49,935 INFO L93 Difference]: Finished difference Result 236 states and 325 transitions. [2021-11-21 00:22:49,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:22:49,936 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 54 [2021-11-21 00:22:49,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:49,939 INFO L225 Difference]: With dead ends: 236 [2021-11-21 00:22:49,939 INFO L226 Difference]: Without dead ends: 170 [2021-11-21 00:22:49,940 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:22:49,941 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 3 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:49,941 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 115 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:22:49,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-11-21 00:22:50,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 165. [2021-11-21 00:22:50,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 102 states have (on average 1.2058823529411764) internal successors, (123), 103 states have internal predecessors, (123), 53 states have call successors, (53), 9 states have call predecessors, (53), 9 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) [2021-11-21 00:22:50,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 228 transitions. [2021-11-21 00:22:50,003 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 228 transitions. Word has length 54 [2021-11-21 00:22:50,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:50,003 INFO L470 AbstractCegarLoop]: Abstraction has 165 states and 228 transitions. [2021-11-21 00:22:50,004 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-21 00:22:50,004 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 228 transitions. [2021-11-21 00:22:50,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-21 00:22:50,011 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:50,011 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:22:50,037 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:50,211 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-21 00:22:50,212 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:22:50,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:50,212 INFO L85 PathProgramCache]: Analyzing trace with hash 1047855047, now seen corresponding path program 1 times [2021-11-21 00:22:50,212 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:50,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [483353646] [2021-11-21 00:22:50,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:50,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:50,224 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:22:50,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [879789216] [2021-11-21 00:22:50,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:50,225 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:50,225 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:50,226 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:50,243 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 00:22:50,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:50,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-21 00:22:50,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:50,629 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 16 proven. 7 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-21 00:22:50,629 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:50,854 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-11-21 00:22:50,855 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:50,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [483353646] [2021-11-21 00:22:50,855 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:22:50,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [879789216] [2021-11-21 00:22:50,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [879789216] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 00:22:50,855 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:22:50,855 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [11] total 13 [2021-11-21 00:22:50,856 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918789877] [2021-11-21 00:22:50,856 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:22:50,856 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:22:50,856 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:50,857 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:22:50,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2021-11-21 00:22:50,857 INFO L87 Difference]: Start difference. First operand 165 states and 228 transitions. Second operand has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:22:50,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:50,980 INFO L93 Difference]: Finished difference Result 185 states and 247 transitions. [2021-11-21 00:22:50,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:22:50,981 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 61 [2021-11-21 00:22:50,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:50,983 INFO L225 Difference]: With dead ends: 185 [2021-11-21 00:22:50,983 INFO L226 Difference]: Without dead ends: 183 [2021-11-21 00:22:50,984 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 108 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2021-11-21 00:22:50,985 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 9 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:50,985 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 132 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:22:50,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2021-11-21 00:22:51,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 177. [2021-11-21 00:22:51,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 111 states have (on average 1.1891891891891893) internal successors, (132), 112 states have internal predecessors, (132), 53 states have call successors, (53), 12 states have call predecessors, (53), 12 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) [2021-11-21 00:22:51,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 237 transitions. [2021-11-21 00:22:51,043 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 237 transitions. Word has length 61 [2021-11-21 00:22:51,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:51,044 INFO L470 AbstractCegarLoop]: Abstraction has 177 states and 237 transitions. [2021-11-21 00:22:51,044 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:22:51,044 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 237 transitions. [2021-11-21 00:22:51,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-21 00:22:51,046 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:51,047 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:22:51,083 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:51,271 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:51,272 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:22:51,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:51,272 INFO L85 PathProgramCache]: Analyzing trace with hash -94425734, now seen corresponding path program 2 times [2021-11-21 00:22:51,272 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:51,272 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [897221056] [2021-11-21 00:22:51,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:51,273 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:51,281 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:22:51,281 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [374258653] [2021-11-21 00:22:51,281 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:22:51,281 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:51,281 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:51,282 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:51,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 00:22:51,330 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 00:22:51,330 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:22:51,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-21 00:22:51,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:51,976 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 8 proven. 21 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:22:51,976 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:52,612 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 10 proven. 19 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:22:52,613 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:52,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [897221056] [2021-11-21 00:22:52,613 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:22:52,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [374258653] [2021-11-21 00:22:52,613 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [374258653] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:22:52,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1543098343] [2021-11-21 00:22:52,616 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-21 00:22:52,616 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:22:52,616 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:22:52,616 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:22:52,616 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:23:15,597 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2021-11-21 00:23:15,720 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 00:23:15,747 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:23:17,584 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:23:17,584 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:23:17,584 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2021-11-21 00:23:17,585 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777732527] [2021-11-21 00:23:17,585 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:23:17,585 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-21 00:23:17,585 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:23:17,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-21 00:23:17,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=1372, Unknown=0, NotChecked=0, Total=1560 [2021-11-21 00:23:17,587 INFO L87 Difference]: Start difference. First operand 177 states and 237 transitions. Second operand has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-21 00:23:28,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:28,846 INFO L93 Difference]: Finished difference Result 454 states and 640 transitions. [2021-11-21 00:23:28,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-21 00:23:28,847 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 59 [2021-11-21 00:23:28,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:28,850 INFO L225 Difference]: With dead ends: 454 [2021-11-21 00:23:28,850 INFO L226 Difference]: Without dead ends: 397 [2021-11-21 00:23:28,853 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 136 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1229 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=653, Invalid=4039, Unknown=0, NotChecked=0, Total=4692 [2021-11-21 00:23:28,854 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 209 mSDsluCounter, 527 mSDsCounter, 0 mSdLazyCounter, 958 mSolverCounterSat, 320 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 592 SdHoareTripleChecker+Invalid, 1278 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 320 IncrementalHoareTripleChecker+Valid, 958 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:28,854 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [209 Valid, 592 Invalid, 1278 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [320 Valid, 958 Invalid, 0 Unknown, 0 Unchecked, 5.5s Time] [2021-11-21 00:23:28,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2021-11-21 00:23:28,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 265. [2021-11-21 00:23:28,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 172 states have (on average 1.2093023255813953) internal successors, (208), 173 states have internal predecessors, (208), 77 states have call successors, (77), 15 states have call predecessors, (77), 15 states have return successors, (76), 76 states have call predecessors, (76), 76 states have call successors, (76) [2021-11-21 00:23:28,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 361 transitions. [2021-11-21 00:23:28,960 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 361 transitions. Word has length 59 [2021-11-21 00:23:28,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:28,961 INFO L470 AbstractCegarLoop]: Abstraction has 265 states and 361 transitions. [2021-11-21 00:23:28,961 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-21 00:23:28,961 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 361 transitions. [2021-11-21 00:23:28,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-21 00:23:28,963 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:28,963 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:23:28,997 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:29,179 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:29,180 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:23:29,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:29,180 INFO L85 PathProgramCache]: Analyzing trace with hash -1223812978, now seen corresponding path program 3 times [2021-11-21 00:23:29,180 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:23:29,181 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1193267271] [2021-11-21 00:23:29,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:29,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:23:29,189 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:23:29,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [550551343] [2021-11-21 00:23:29,189 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:23:29,190 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:29,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:29,191 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:29,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 00:23:29,236 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:23:29,236 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:29,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 00:23:29,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:29,379 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 27 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:23:29,379 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:29,530 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 27 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:23:29,530 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:23:29,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1193267271] [2021-11-21 00:23:29,530 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:23:29,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [550551343] [2021-11-21 00:23:29,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [550551343] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:29,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1973630697] [2021-11-21 00:23:29,533 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-21 00:23:29,533 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:23:29,534 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:23:29,534 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:23:29,534 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:28:36,335 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 14 for LOIs [2021-11-21 00:28:36,400 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 00:28:36,424 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:28:38,747 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:28:38,747 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:28:38,748 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-11-21 00:28:38,748 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606382110] [2021-11-21 00:28:38,748 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:28:38,748 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-21 00:28:38,748 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:28:38,749 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-21 00:28:38,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=934, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 00:28:38,749 INFO L87 Difference]: Start difference. First operand 265 states and 361 transitions. Second operand has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-21 00:28:39,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:28:39,265 INFO L93 Difference]: Finished difference Result 378 states and 527 transitions. [2021-11-21 00:28:39,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-21 00:28:39,267 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 59 [2021-11-21 00:28:39,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:28:39,270 INFO L225 Difference]: With dead ends: 378 [2021-11-21 00:28:39,271 INFO L226 Difference]: Without dead ends: 286 [2021-11-21 00:28:39,272 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 521 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=234, Invalid=1746, Unknown=0, NotChecked=0, Total=1980 [2021-11-21 00:28:39,276 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 59 mSDsluCounter, 206 mSDsCounter, 0 mSdLazyCounter, 228 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 228 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:28:39,277 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 258 Invalid, 303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 228 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:28:39,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2021-11-21 00:28:39,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 240. [2021-11-21 00:28:39,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 240 states, 155 states have (on average 1.1612903225806452) internal successors, (180), 156 states have internal predecessors, (180), 69 states have call successors, (69), 15 states have call predecessors, (69), 15 states have return successors, (68), 68 states have call predecessors, (68), 68 states have call successors, (68) [2021-11-21 00:28:39,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 317 transitions. [2021-11-21 00:28:39,356 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 317 transitions. Word has length 59 [2021-11-21 00:28:39,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:28:39,356 INFO L470 AbstractCegarLoop]: Abstraction has 240 states and 317 transitions. [2021-11-21 00:28:39,357 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-21 00:28:39,357 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 317 transitions. [2021-11-21 00:28:39,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-21 00:28:39,358 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:28:39,358 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:28:39,382 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 00:28:39,567 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-21 00:28:39,568 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:28:39,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:28:39,568 INFO L85 PathProgramCache]: Analyzing trace with hash 255729376, now seen corresponding path program 4 times [2021-11-21 00:28:39,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:28:39,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1453063251] [2021-11-21 00:28:39,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:28:39,569 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:28:39,591 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:28:39,591 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [46534884] [2021-11-21 00:28:39,591 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:28:39,592 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:28:39,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:28:39,592 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:28:39,613 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 00:28:39,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:28:39,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 00:28:39,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:28:39,845 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 18 proven. 6 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-21 00:28:39,845 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:28:39,963 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2021-11-21 00:28:39,964 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:28:39,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1453063251] [2021-11-21 00:28:39,964 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:28:39,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [46534884] [2021-11-21 00:28:39,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [46534884] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 00:28:39,965 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:28:39,965 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 9 [2021-11-21 00:28:39,965 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [414234550] [2021-11-21 00:28:39,965 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:28:39,965 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:28:39,966 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:28:39,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:28:39,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-21 00:28:39,966 INFO L87 Difference]: Start difference. First operand 240 states and 317 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-21 00:28:40,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:28:40,086 INFO L93 Difference]: Finished difference Result 289 states and 395 transitions. [2021-11-21 00:28:40,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:28:40,086 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 64 [2021-11-21 00:28:40,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:28:40,088 INFO L225 Difference]: With dead ends: 289 [2021-11-21 00:28:40,088 INFO L226 Difference]: Without dead ends: 287 [2021-11-21 00:28:40,089 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 118 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:28:40,089 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 8 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:28:40,089 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 115 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:28:40,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2021-11-21 00:28:40,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 280. [2021-11-21 00:28:40,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 280 states, 170 states have (on average 1.1823529411764706) internal successors, (201), 171 states have internal predecessors, (201), 93 states have call successors, (93), 16 states have call predecessors, (93), 16 states have return successors, (92), 92 states have call predecessors, (92), 92 states have call successors, (92) [2021-11-21 00:28:40,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 386 transitions. [2021-11-21 00:28:40,208 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 386 transitions. Word has length 64 [2021-11-21 00:28:40,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:28:40,209 INFO L470 AbstractCegarLoop]: Abstraction has 280 states and 386 transitions. [2021-11-21 00:28:40,209 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-21 00:28:40,209 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 386 transitions. [2021-11-21 00:28:40,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-21 00:28:40,210 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:28:40,210 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:28:40,248 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 00:28:40,423 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-21 00:28:40,424 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:28:40,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:28:40,424 INFO L85 PathProgramCache]: Analyzing trace with hash 1508724982, now seen corresponding path program 5 times [2021-11-21 00:28:40,424 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:28:40,424 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [674805336] [2021-11-21 00:28:40,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:28:40,424 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:28:40,433 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:28:40,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [370972469] [2021-11-21 00:28:40,433 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:28:40,433 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:28:40,433 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:28:40,435 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:28:40,437 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 00:28:40,487 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 00:28:40,487 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:28:40,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-21 00:28:40,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:28:41,451 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 21 proven. 23 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-21 00:28:41,451 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:28:43,411 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 23 proven. 21 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-21 00:28:43,412 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:28:43,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [674805336] [2021-11-21 00:28:43,412 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:28:43,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [370972469] [2021-11-21 00:28:43,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [370972469] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:28:43,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1100404050] [2021-11-21 00:28:43,415 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-21 00:28:43,415 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:28:43,416 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:28:43,416 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:28:43,416 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:32:37,241 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 00:32:37,314 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 00:32:37,340 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:32:41,861 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:32:41,861 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:32:41,862 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 27 [2021-11-21 00:32:41,862 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23013552] [2021-11-21 00:32:41,862 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:32:41,862 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-21 00:32:41,862 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:32:41,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-21 00:32:41,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=1951, Unknown=0, NotChecked=0, Total=2162 [2021-11-21 00:32:41,864 INFO L87 Difference]: Start difference. First operand 280 states and 386 transitions. Second operand has 27 states, 25 states have (on average 2.24) internal successors, (56), 24 states have internal predecessors, (56), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-11-21 00:32:56,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:32:56,816 INFO L93 Difference]: Finished difference Result 378 states and 512 transitions. [2021-11-21 00:32:56,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-21 00:32:56,817 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 25 states have (on average 2.24) internal successors, (56), 24 states have internal predecessors, (56), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 64 [2021-11-21 00:32:56,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:32:56,821 INFO L225 Difference]: With dead ends: 378 [2021-11-21 00:32:56,821 INFO L226 Difference]: Without dead ends: 376 [2021-11-21 00:32:56,824 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 143 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1834 ImplicationChecksByTransitivity, 15.9s TimeCoverageRelationStatistics Valid=807, Invalid=5673, Unknown=0, NotChecked=0, Total=6480 [2021-11-21 00:32:56,825 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 224 mSDsluCounter, 457 mSDsCounter, 0 mSdLazyCounter, 1142 mSolverCounterSat, 494 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 224 SdHoareTripleChecker+Valid, 485 SdHoareTripleChecker+Invalid, 1636 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 494 IncrementalHoareTripleChecker+Valid, 1142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:32:56,825 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [224 Valid, 485 Invalid, 1636 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [494 Valid, 1142 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2021-11-21 00:32:56,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2021-11-21 00:32:56,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 362. [2021-11-21 00:32:56,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 225 states have (on average 1.1688888888888889) internal successors, (263), 229 states have internal predecessors, (263), 115 states have call successors, (115), 21 states have call predecessors, (115), 21 states have return successors, (114), 111 states have call predecessors, (114), 114 states have call successors, (114) [2021-11-21 00:32:56,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 492 transitions. [2021-11-21 00:32:56,969 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 492 transitions. Word has length 64 [2021-11-21 00:32:56,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:32:56,970 INFO L470 AbstractCegarLoop]: Abstraction has 362 states and 492 transitions. [2021-11-21 00:32:56,970 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 25 states have (on average 2.24) internal successors, (56), 24 states have internal predecessors, (56), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-11-21 00:32:56,970 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 492 transitions. [2021-11-21 00:32:56,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-21 00:32:56,972 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:32:56,972 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:32:56,996 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 00:32:57,179 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:32:57,180 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:32:57,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:32:57,180 INFO L85 PathProgramCache]: Analyzing trace with hash 1897496259, now seen corresponding path program 1 times [2021-11-21 00:32:57,180 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:32:57,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [972414524] [2021-11-21 00:32:57,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:57,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:32:57,187 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:32:57,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1955458411] [2021-11-21 00:32:57,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:57,187 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:32:57,188 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:32:57,202 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:32:57,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 00:32:57,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:57,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 85 conjunts are in the unsatisfiable core [2021-11-21 00:32:57,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:32:58,258 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 51 proven. 32 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2021-11-21 00:32:58,258 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:33:00,421 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 61 proven. 17 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-21 00:33:00,422 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:33:00,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [972414524] [2021-11-21 00:33:00,422 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:33:00,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1955458411] [2021-11-21 00:33:00,423 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1955458411] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:33:00,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1487986911] [2021-11-21 00:33:00,425 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-21 00:33:00,425 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:33:00,426 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:33:00,426 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:33:00,426 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:33:26,902 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 14 for LOIs [2021-11-21 00:33:26,965 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 00:33:26,987 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:33:33,720 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:33:33,720 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:33:33,720 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15] total 27 [2021-11-21 00:33:33,721 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944767821] [2021-11-21 00:33:33,721 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:33:33,721 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-21 00:33:33,721 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:33:33,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-21 00:33:33,722 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=1855, Unknown=0, NotChecked=0, Total=2070 [2021-11-21 00:33:33,722 INFO L87 Difference]: Start difference. First operand 362 states and 492 transitions. Second operand has 27 states, 22 states have (on average 2.409090909090909) internal successors, (53), 23 states have internal predecessors, (53), 11 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 9 states have call successors, (20) [2021-11-21 00:33:43,827 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 00:33:46,801 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 00:33:53,287 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 00:33:57,932 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.36s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 00:34:00,047 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 00:34:07,146 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 00:34:09,246 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 00:34:10,941 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.09s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 00:34:13,016 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 00:34:17,439 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 00:34:22,037 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 00:34:23,683 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.43s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 00:34:25,702 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 00:34:27,754 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 00:34:29,050 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.21s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 00:34:31,628 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 00:34:32,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:34:32,932 INFO L93 Difference]: Finished difference Result 598 states and 853 transitions. [2021-11-21 00:34:32,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-11-21 00:34:32,934 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 22 states have (on average 2.409090909090909) internal successors, (53), 23 states have internal predecessors, (53), 11 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 9 states have call successors, (20) Word has length 78 [2021-11-21 00:34:32,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:34:32,938 INFO L225 Difference]: With dead ends: 598 [2021-11-21 00:34:32,939 INFO L226 Difference]: Without dead ends: 594 [2021-11-21 00:34:32,942 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 201 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2787 ImplicationChecksByTransitivity, 25.6s TimeCoverageRelationStatistics Valid=1124, Invalid=8188, Unknown=0, NotChecked=0, Total=9312 [2021-11-21 00:34:32,943 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 188 mSDsluCounter, 773 mSDsCounter, 0 mSdLazyCounter, 1524 mSolverCounterSat, 502 mSolverCounterUnsat, 12 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 41.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 191 SdHoareTripleChecker+Valid, 813 SdHoareTripleChecker+Invalid, 2038 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 502 IncrementalHoareTripleChecker+Valid, 1524 IncrementalHoareTripleChecker+Invalid, 12 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 41.7s IncrementalHoareTripleChecker+Time [2021-11-21 00:34:32,943 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [191 Valid, 813 Invalid, 2038 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [502 Valid, 1524 Invalid, 12 Unknown, 0 Unchecked, 41.7s Time] [2021-11-21 00:34:32,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 594 states. [2021-11-21 00:34:33,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 594 to 532. [2021-11-21 00:34:33,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 532 states, 313 states have (on average 1.1980830670926517) internal successors, (375), 317 states have internal predecessors, (375), 191 states have call successors, (191), 27 states have call predecessors, (191), 27 states have return successors, (190), 187 states have call predecessors, (190), 190 states have call successors, (190) [2021-11-21 00:34:33,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 532 states to 532 states and 756 transitions. [2021-11-21 00:34:33,265 INFO L78 Accepts]: Start accepts. Automaton has 532 states and 756 transitions. Word has length 78 [2021-11-21 00:34:33,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:34:33,267 INFO L470 AbstractCegarLoop]: Abstraction has 532 states and 756 transitions. [2021-11-21 00:34:33,267 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 22 states have (on average 2.409090909090909) internal successors, (53), 23 states have internal predecessors, (53), 11 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 9 states have call successors, (20) [2021-11-21 00:34:33,268 INFO L276 IsEmpty]: Start isEmpty. Operand 532 states and 756 transitions. [2021-11-21 00:34:33,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-21 00:34:33,271 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:34:33,271 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:34:33,309 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 00:34:33,499 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-21 00:34:33,500 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:34:33,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:34:33,500 INFO L85 PathProgramCache]: Analyzing trace with hash -1729932497, now seen corresponding path program 1 times [2021-11-21 00:34:33,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:34:33,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [503805845] [2021-11-21 00:34:33,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:34:33,501 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:34:33,506 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:34:33,506 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1764005223] [2021-11-21 00:34:33,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:34:33,506 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:34:33,506 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:34:33,511 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:34:33,511 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_759c98d4-2d1a-4c9a-9a64-b7f86e27f677/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-21 00:34:33,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:34:33,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-21 00:34:33,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:34:34,010 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 20 proven. 19 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2021-11-21 00:34:34,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:34:34,736 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 20 proven. 16 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2021-11-21 00:34:34,736 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:34:34,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [503805845] [2021-11-21 00:34:34,737 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:34:34,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1764005223] [2021-11-21 00:34:34,737 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1764005223] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:34:34,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1261078783] [2021-11-21 00:34:34,739 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-21 00:34:34,739 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:34:34,739 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:34:34,740 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:34:34,740 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs