./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/bitvector/soft_float_1-3a.c.cil.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_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/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_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/bitvector/soft_float_1-3a.c.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/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_c432c816-16f9-4178-900c-ed89723ff5d3/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 2e6e06de31959e386aafc2fb45c848364ae9fea32df4ba40928c607f134f313f --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:44:56,393 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:44:56,396 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:44:56,457 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:44:56,457 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:44:56,462 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:44:56,464 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:44:56,467 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:44:56,470 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:44:56,475 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:44:56,476 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:44:56,478 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:44:56,479 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:44:56,481 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:44:56,483 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:44:56,491 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:44:56,493 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:44:56,494 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:44:56,496 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:44:56,506 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:44:56,508 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:44:56,509 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:44:56,512 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:44:56,513 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:44:56,522 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:44:56,522 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:44:56,523 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:44:56,524 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:44:56,525 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:44:56,526 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:44:56,526 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:44:56,527 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:44:56,528 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:44:56,529 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:44:56,530 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:44:56,530 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:44:56,531 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:44:56,531 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:44:56,531 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:44:56,532 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:44:56,533 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:44:56,534 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:44:56,560 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:44:56,560 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:44:56,561 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:44:56,561 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:44:56,561 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:44:56,562 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:44:56,562 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:44:56,562 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:44:56,562 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:44:56,563 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:44:56,563 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:44:56,563 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:44:56,563 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:44:56,564 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:44:56,564 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:44:56,564 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:44:56,564 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:44:56,565 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:44:56,565 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:44:56,566 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:44:56,566 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:44:56,566 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:44:56,566 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:44:56,567 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:44:56,567 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:44:56,567 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:44:56,567 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:44:56,568 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:44:56,568 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:44:56,568 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:44:56,568 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:44:56,569 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:44:56,569 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:44:56,569 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:44:56,569 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:44:56,570 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:44:56,570 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:44:56,570 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:44:56,570 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:44:56,571 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:44:56,571 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:44:56,571 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_c432c816-16f9-4178-900c-ed89723ff5d3/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2e6e06de31959e386aafc2fb45c848364ae9fea32df4ba40928c607f134f313f [2021-11-20 23:44:56,851 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:44:56,886 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:44:56,889 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:44:56,890 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:44:56,891 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:44:56,893 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/bitvector/soft_float_1-3a.c.cil.c [2021-11-20 23:44:56,983 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/data/97940f09d/b44d02bee02f41c0b0ba9de89dd4c061/FLAG3bb4ff2c4 [2021-11-20 23:44:57,561 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:44:57,561 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/sv-benchmarks/c/bitvector/soft_float_1-3a.c.cil.c [2021-11-20 23:44:57,578 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/data/97940f09d/b44d02bee02f41c0b0ba9de89dd4c061/FLAG3bb4ff2c4 [2021-11-20 23:44:57,877 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/data/97940f09d/b44d02bee02f41c0b0ba9de89dd4c061 [2021-11-20 23:44:57,881 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:44:57,883 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:44:57,888 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:44:57,888 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:44:57,891 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:44:57,893 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:44:57" (1/1) ... [2021-11-20 23:44:57,895 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@672dab49 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:44:57, skipping insertion in model container [2021-11-20 23:44:57,895 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:44:57" (1/1) ... [2021-11-20 23:44:57,903 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:44:57,951 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:44:58,112 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_c432c816-16f9-4178-900c-ed89723ff5d3/sv-benchmarks/c/bitvector/soft_float_1-3a.c.cil.c[730,743] [2021-11-20 23:44:58,166 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:44:58,174 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:44:58,186 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_c432c816-16f9-4178-900c-ed89723ff5d3/sv-benchmarks/c/bitvector/soft_float_1-3a.c.cil.c[730,743] [2021-11-20 23:44:58,221 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:44:58,234 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:44:58,234 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:44:58 WrapperNode [2021-11-20 23:44:58,234 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:44:58,235 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:44:58,236 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:44:58,236 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:44:58,243 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:44:58" (1/1) ... [2021-11-20 23:44:58,253 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:44:58" (1/1) ... [2021-11-20 23:44:58,281 INFO L137 Inliner]: procedures = 17, calls = 19, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 147 [2021-11-20 23:44:58,282 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:44:58,283 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:44:58,283 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:44:58,283 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:44:58,291 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:44:58" (1/1) ... [2021-11-20 23:44:58,291 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:44:58" (1/1) ... [2021-11-20 23:44:58,294 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:44:58" (1/1) ... [2021-11-20 23:44:58,294 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:44:58" (1/1) ... [2021-11-20 23:44:58,301 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:44:58" (1/1) ... [2021-11-20 23:44:58,306 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:44:58" (1/1) ... [2021-11-20 23:44:58,308 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:44:58" (1/1) ... [2021-11-20 23:44:58,311 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:44:58,312 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:44:58,312 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:44:58,312 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:44:58,313 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:44:58" (1/1) ... [2021-11-20 23:44:58,336 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:44:58,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:44:58,374 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:44:58,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:44:58,414 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:44:58,414 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:44:58,414 INFO L130 BoogieDeclarations]: Found specification of procedure base2flt [2021-11-20 23:44:58,414 INFO L138 BoogieDeclarations]: Found implementation of procedure base2flt [2021-11-20 23:44:58,415 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:44:58,415 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:44:58,415 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-20 23:44:58,415 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-20 23:44:58,486 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:44:58,488 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:44:58,826 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:44:58,970 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:44:58,970 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-20 23:44:58,973 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:44:58 BoogieIcfgContainer [2021-11-20 23:44:58,973 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:44:58,975 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:44:58,977 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:44:58,980 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:44:58,980 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:44:57" (1/3) ... [2021-11-20 23:44:58,982 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d8352aa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:44:58, skipping insertion in model container [2021-11-20 23:44:58,982 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:44:58" (2/3) ... [2021-11-20 23:44:58,982 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d8352aa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:44:58, skipping insertion in model container [2021-11-20 23:44:58,982 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:44:58" (3/3) ... [2021-11-20 23:44:58,984 INFO L111 eAbstractionObserver]: Analyzing ICFG soft_float_1-3a.c.cil.c [2021-11-20 23:44:58,997 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:44:58,997 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 23:44:59,061 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:44:59,071 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-20 23:44:59,071 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 23:44:59,115 INFO L276 IsEmpty]: Start isEmpty. Operand has 47 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 37 states have internal predecessors, (52), 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) [2021-11-20 23:44:59,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-20 23:44:59,122 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:44:59,123 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:44:59,124 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:44:59,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:44:59,130 INFO L85 PathProgramCache]: Analyzing trace with hash 1511064706, now seen corresponding path program 1 times [2021-11-20 23:44:59,139 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:44:59,140 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [381552322] [2021-11-20 23:44:59,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:44:59,141 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:44:59,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:44:59,570 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-20 23:44:59,570 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:44:59,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [381552322] [2021-11-20 23:44:59,571 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [381552322] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:44:59,572 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:44:59,572 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-20 23:44:59,573 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36967269] [2021-11-20 23:44:59,574 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:44:59,578 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-20 23:44:59,579 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:44:59,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-20 23:44:59,618 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-20 23:44:59,621 INFO L87 Difference]: Start difference. First operand has 47 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 37 states have internal predecessors, (52), 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 8 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-20 23:44:59,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:44:59,921 INFO L93 Difference]: Finished difference Result 133 states and 221 transitions. [2021-11-20 23:44:59,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-20 23:44:59,923 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2021-11-20 23:44:59,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:44:59,934 INFO L225 Difference]: With dead ends: 133 [2021-11-20 23:44:59,934 INFO L226 Difference]: Without dead ends: 82 [2021-11-20 23:44:59,938 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-11-20 23:44:59,942 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 51 mSDsluCounter, 452 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 508 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:44:59,943 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 508 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:44:59,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-20 23:45:00,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 51. [2021-11-20 23:45:00,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 37 states have (on average 1.3783783783783783) internal successors, (51), 39 states have internal predecessors, (51), 10 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (13), 10 states have call predecessors, (13), 9 states have call successors, (13) [2021-11-20 23:45:00,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 74 transitions. [2021-11-20 23:45:00,024 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 74 transitions. Word has length 24 [2021-11-20 23:45:00,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:45:00,025 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 74 transitions. [2021-11-20 23:45:00,025 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-20 23:45:00,025 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 74 transitions. [2021-11-20 23:45:00,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-20 23:45:00,030 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:45:00,030 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:45:00,030 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:45:00,031 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:45:00,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:45:00,033 INFO L85 PathProgramCache]: Analyzing trace with hash 105677899, now seen corresponding path program 1 times [2021-11-20 23:45:00,033 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:45:00,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [623664073] [2021-11-20 23:45:00,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:00,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:45:00,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:00,276 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-20 23:45:00,277 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:45:00,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [623664073] [2021-11-20 23:45:00,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [623664073] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:45:00,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1254882995] [2021-11-20 23:45:00,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:00,278 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:00,279 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:45:00,282 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:45:00,309 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:45:00,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:00,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-20 23:45:00,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:45:00,647 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:45:00,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:45:00,909 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-20 23:45:00,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1254882995] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:45:00,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1595803117] [2021-11-20 23:45:00,928 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-20 23:45:00,929 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:45:00,933 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:45:00,938 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:45:00,939 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:45:02,829 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 60 for LOIs [2021-11-20 23:45:03,087 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:45:04,253 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1595803117] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:45:04,253 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:45:04,254 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [9, 9, 7] total 32 [2021-11-20 23:45:04,255 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490012482] [2021-11-20 23:45:04,255 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:45:04,256 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-20 23:45:04,256 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:45:04,257 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-20 23:45:04,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=846, Unknown=0, NotChecked=0, Total=992 [2021-11-20 23:45:04,258 INFO L87 Difference]: Start difference. First operand 51 states and 74 transitions. Second operand has 15 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:45:05,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:45:05,065 INFO L93 Difference]: Finished difference Result 138 states and 222 transitions. [2021-11-20 23:45:05,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-20 23:45:05,066 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 27 [2021-11-20 23:45:05,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:45:05,070 INFO L225 Difference]: With dead ends: 138 [2021-11-20 23:45:05,072 INFO L226 Difference]: Without dead ends: 124 [2021-11-20 23:45:05,075 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=146, Invalid=846, Unknown=0, NotChecked=0, Total=992 [2021-11-20 23:45:05,078 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 133 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 431 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 311 SdHoareTripleChecker+Invalid, 469 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 431 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 23:45:05,079 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [166 Valid, 311 Invalid, 469 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 431 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 23:45:05,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-20 23:45:05,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 62. [2021-11-20 23:45:05,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 45 states have (on average 1.3111111111111111) internal successors, (59), 47 states have internal predecessors, (59), 12 states have call successors, (12), 2 states have call predecessors, (12), 4 states have return successors, (23), 13 states have call predecessors, (23), 11 states have call successors, (23) [2021-11-20 23:45:05,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 94 transitions. [2021-11-20 23:45:05,120 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 94 transitions. Word has length 27 [2021-11-20 23:45:05,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:45:05,120 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 94 transitions. [2021-11-20 23:45:05,121 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:45:05,121 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 94 transitions. [2021-11-20 23:45:05,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-20 23:45:05,130 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:45:05,131 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:45:05,163 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-20 23:45:05,354 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:05,355 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:45:05,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:45:05,355 INFO L85 PathProgramCache]: Analyzing trace with hash -1837782345, now seen corresponding path program 1 times [2021-11-20 23:45:05,356 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:45:05,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [175259567] [2021-11-20 23:45:05,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:05,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:45:05,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:05,692 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-20 23:45:05,692 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:45:05,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [175259567] [2021-11-20 23:45:05,693 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [175259567] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:45:05,693 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:45:05,693 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-11-20 23:45:05,693 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817419803] [2021-11-20 23:45:05,694 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:45:05,694 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-20 23:45:05,695 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:45:05,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-20 23:45:05,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2021-11-20 23:45:05,696 INFO L87 Difference]: Start difference. First operand 62 states and 94 transitions. Second operand has 13 states, 10 states have (on average 1.7) internal successors, (17), 10 states have internal predecessors, (17), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-20 23:45:05,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:45:05,959 INFO L93 Difference]: Finished difference Result 99 states and 147 transitions. [2021-11-20 23:45:05,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-20 23:45:05,959 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 10 states have (on average 1.7) internal successors, (17), 10 states have internal predecessors, (17), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 28 [2021-11-20 23:45:05,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:45:05,961 INFO L225 Difference]: With dead ends: 99 [2021-11-20 23:45:05,961 INFO L226 Difference]: Without dead ends: 84 [2021-11-20 23:45:05,962 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-11-20 23:45:05,963 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 56 mSDsluCounter, 679 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 744 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:45:05,964 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 744 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:45:05,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-20 23:45:05,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 63. [2021-11-20 23:45:05,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 44 states have (on average 1.3181818181818181) internal successors, (58), 48 states have internal predecessors, (58), 14 states have call successors, (14), 2 states have call predecessors, (14), 4 states have return successors, (23), 13 states have call predecessors, (23), 12 states have call successors, (23) [2021-11-20 23:45:05,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 95 transitions. [2021-11-20 23:45:05,984 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 95 transitions. Word has length 28 [2021-11-20 23:45:05,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:45:05,984 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 95 transitions. [2021-11-20 23:45:05,985 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 10 states have (on average 1.7) internal successors, (17), 10 states have internal predecessors, (17), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-20 23:45:05,985 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 95 transitions. [2021-11-20 23:45:05,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-20 23:45:05,986 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:45:05,987 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:45:05,987 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-20 23:45:05,987 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:45:05,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:45:05,988 INFO L85 PathProgramCache]: Analyzing trace with hash 8886071, now seen corresponding path program 1 times [2021-11-20 23:45:05,988 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:45:05,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1209562135] [2021-11-20 23:45:05,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:05,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:45:06,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:06,157 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-20 23:45:06,157 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:45:06,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1209562135] [2021-11-20 23:45:06,162 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1209562135] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:45:06,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1753663557] [2021-11-20 23:45:06,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:06,163 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:06,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:45:06,167 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:45:06,202 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:45:06,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:06,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-20 23:45:06,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:45:06,394 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:45:06,394 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:45:06,888 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-20 23:45:06,888 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1753663557] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:45:06,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [843779608] [2021-11-20 23:45:06,891 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2021-11-20 23:45:06,892 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:45:06,892 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:45:06,892 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:45:06,892 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:46:13,411 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-20 23:46:13,445 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 60 for LOIs [2021-11-20 23:46:14,058 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:46:16,166 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:46:16,166 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:46:16,166 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 8] total 14 [2021-11-20 23:46:16,166 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048570884] [2021-11-20 23:46:16,166 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:46:16,167 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-20 23:46:16,167 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:46:16,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-20 23:46:16,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=893, Unknown=0, NotChecked=0, Total=992 [2021-11-20 23:46:16,169 INFO L87 Difference]: Start difference. First operand 63 states and 95 transitions. Second operand has 14 states, 11 states have (on average 2.272727272727273) internal successors, (25), 11 states have internal predecessors, (25), 4 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-20 23:46:16,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:46:16,680 INFO L93 Difference]: Finished difference Result 154 states and 229 transitions. [2021-11-20 23:46:16,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-20 23:46:16,681 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 2.272727272727273) internal successors, (25), 11 states have internal predecessors, (25), 4 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) Word has length 28 [2021-11-20 23:46:16,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:46:16,686 INFO L225 Difference]: With dead ends: 154 [2021-11-20 23:46:16,687 INFO L226 Difference]: Without dead ends: 97 [2021-11-20 23:46:16,690 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 324 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=150, Invalid=1332, Unknown=0, NotChecked=0, Total=1482 [2021-11-20 23:46:16,692 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 53 mSDsluCounter, 641 mSDsCounter, 0 mSdLazyCounter, 335 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 633 SdHoareTripleChecker+Invalid, 353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 335 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:46:16,694 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 633 Invalid, 353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 335 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:46:16,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-11-20 23:46:16,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 65. [2021-11-20 23:46:16,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 47 states have (on average 1.297872340425532) internal successors, (61), 49 states have internal predecessors, (61), 13 states have call successors, (13), 3 states have call predecessors, (13), 4 states have return successors, (18), 13 states have call predecessors, (18), 11 states have call successors, (18) [2021-11-20 23:46:16,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 92 transitions. [2021-11-20 23:46:16,717 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 92 transitions. Word has length 28 [2021-11-20 23:46:16,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:46:16,718 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 92 transitions. [2021-11-20 23:46:16,718 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 2.272727272727273) internal successors, (25), 11 states have internal predecessors, (25), 4 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-20 23:46:16,718 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 92 transitions. [2021-11-20 23:46:16,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-20 23:46:16,720 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:46:16,720 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:46:16,745 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-20 23:46:16,937 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2021-11-20 23:46:16,937 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:46:16,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:46:16,938 INFO L85 PathProgramCache]: Analyzing trace with hash -319163729, now seen corresponding path program 1 times [2021-11-20 23:46:16,938 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:46:16,938 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1389424767] [2021-11-20 23:46:16,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:16,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:46:16,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:17,063 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-20 23:46:17,063 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:46:17,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1389424767] [2021-11-20 23:46:17,064 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1389424767] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:46:17,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [56093515] [2021-11-20 23:46:17,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:17,064 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:17,065 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:46:17,066 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:46:17,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:46:17,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:17,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-20 23:46:17,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:46:17,270 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:46:17,270 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:46:17,457 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-20 23:46:17,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [56093515] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:46:17,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [69902193] [2021-11-20 23:46:17,460 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2021-11-20 23:46:17,460 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:46:17,461 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:46:17,461 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:46:17,461 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:46:19,349 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 15 for LOIs [2021-11-20 23:46:19,618 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:46:20,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [69902193] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:46:20,823 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:46:20,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [9, 9, 7] total 34 [2021-11-20 23:46:20,824 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475434013] [2021-11-20 23:46:20,824 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:46:20,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-20 23:46:20,825 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:46:20,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-20 23:46:20,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=979, Unknown=0, NotChecked=0, Total=1122 [2021-11-20 23:46:20,826 INFO L87 Difference]: Start difference. First operand 65 states and 92 transitions. Second operand has 17 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:46:22,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:46:22,433 INFO L93 Difference]: Finished difference Result 111 states and 158 transitions. [2021-11-20 23:46:22,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-20 23:46:22,439 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 30 [2021-11-20 23:46:22,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:46:22,440 INFO L225 Difference]: With dead ends: 111 [2021-11-20 23:46:22,440 INFO L226 Difference]: Without dead ends: 97 [2021-11-20 23:46:22,441 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 318 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=222, Invalid=1338, Unknown=0, NotChecked=0, Total=1560 [2021-11-20 23:46:22,442 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 88 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 404 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 415 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 404 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:46:22,443 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [102 Valid, 251 Invalid, 415 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 404 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:46:22,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-11-20 23:46:22,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 69. [2021-11-20 23:46:22,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 50 states have (on average 1.3) internal successors, (65), 53 states have internal predecessors, (65), 13 states have call successors, (13), 3 states have call predecessors, (13), 5 states have return successors, (21), 13 states have call predecessors, (21), 11 states have call successors, (21) [2021-11-20 23:46:22,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 99 transitions. [2021-11-20 23:46:22,472 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 99 transitions. Word has length 30 [2021-11-20 23:46:22,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:46:22,473 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 99 transitions. [2021-11-20 23:46:22,473 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:46:22,473 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 99 transitions. [2021-11-20 23:46:22,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-20 23:46:22,479 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:46:22,479 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:46:22,517 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:46:22,699 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:22,700 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:46:22,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:46:22,700 INFO L85 PathProgramCache]: Analyzing trace with hash -2033780362, now seen corresponding path program 1 times [2021-11-20 23:46:22,700 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:46:22,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [347028595] [2021-11-20 23:46:22,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:22,701 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:46:22,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:22,835 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-20 23:46:22,835 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:46:22,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [347028595] [2021-11-20 23:46:22,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [347028595] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:46:22,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [107450137] [2021-11-20 23:46:22,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:22,836 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:22,837 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:46:22,838 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:46:22,865 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:46:22,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:22,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-20 23:46:22,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:46:23,009 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:46:23,009 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:46:23,164 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-20 23:46:23,164 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [107450137] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:46:23,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1992928709] [2021-11-20 23:46:23,167 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-20 23:46:23,167 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:46:23,168 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:46:23,168 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:46:23,168 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:46:25,071 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 60 for LOIs [2021-11-20 23:46:25,655 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:46:27,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1992928709] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:46:27,379 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:46:27,380 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [7, 9, 7] total 32 [2021-11-20 23:46:27,380 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384514663] [2021-11-20 23:46:27,380 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:46:27,381 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-20 23:46:27,381 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:46:27,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-20 23:46:27,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=889, Unknown=0, NotChecked=0, Total=992 [2021-11-20 23:46:27,382 INFO L87 Difference]: Start difference. First operand 69 states and 99 transitions. Second operand has 19 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 14 states have internal predecessors, (19), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:46:31,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:46:31,420 INFO L93 Difference]: Finished difference Result 142 states and 212 transitions. [2021-11-20 23:46:31,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-20 23:46:31,420 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 14 states have internal predecessors, (19), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 31 [2021-11-20 23:46:31,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:46:31,423 INFO L225 Difference]: With dead ends: 142 [2021-11-20 23:46:31,424 INFO L226 Difference]: Without dead ends: 116 [2021-11-20 23:46:31,424 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 303 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=215, Invalid=1591, Unknown=0, NotChecked=0, Total=1806 [2021-11-20 23:46:31,425 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 240 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 549 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 252 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 619 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 549 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:46:31,426 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [252 Valid, 184 Invalid, 619 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 549 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-20 23:46:31,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-20 23:46:31,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 59. [2021-11-20 23:46:31,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 46 states have internal predecessors, (59), 10 states have call successors, (10), 3 states have call predecessors, (10), 4 states have return successors, (13), 10 states have call predecessors, (13), 9 states have call successors, (13) [2021-11-20 23:46:31,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 82 transitions. [2021-11-20 23:46:31,446 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 82 transitions. Word has length 31 [2021-11-20 23:46:31,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:46:31,448 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 82 transitions. [2021-11-20 23:46:31,449 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 14 states have internal predecessors, (19), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:46:31,449 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 82 transitions. [2021-11-20 23:46:31,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-20 23:46:31,450 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:46:31,450 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 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] [2021-11-20 23:46:31,473 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-20 23:46:31,666 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-20 23:46:31,666 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:46:31,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:46:31,667 INFO L85 PathProgramCache]: Analyzing trace with hash 558488300, now seen corresponding path program 1 times [2021-11-20 23:46:31,667 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:46:31,667 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1886239655] [2021-11-20 23:46:31,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:31,667 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:46:31,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:32,201 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-20 23:46:32,201 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:46:32,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1886239655] [2021-11-20 23:46:32,202 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1886239655] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:46:32,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [55766765] [2021-11-20 23:46:32,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:32,202 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:32,202 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:46:32,204 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:46:32,204 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c432c816-16f9-4178-900c-ed89723ff5d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:46:32,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:32,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-20 23:46:32,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:46:32,680 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:46:32,680 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:46:33,272 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-20 23:46:33,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [55766765] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:46:33,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1905524199] [2021-11-20 23:46:33,275 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-20 23:46:33,275 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:46:33,275 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:46:33,276 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:46:33,276 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs