./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/bitvector/soft_float_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_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/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_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/bitvector/soft_float_3a.c.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/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_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/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 95f89ee6bcff8f17eb3e93b344abecdfb8ddea0894d1b25afafccf6235d7ced6 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:25:07,207 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:25:07,210 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:25:07,267 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:25:07,267 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:25:07,272 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:25:07,274 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:25:07,278 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:25:07,281 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:25:07,287 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:25:07,288 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:25:07,290 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:25:07,291 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:25:07,294 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:25:07,296 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:25:07,300 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:25:07,303 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:25:07,304 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:25:07,307 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:25:07,315 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:25:07,317 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:25:07,319 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:25:07,322 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:25:07,323 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:25:07,333 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:25:07,334 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:25:07,334 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:25:07,337 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:25:07,337 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:25:07,339 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:25:07,339 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:25:07,341 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:25:07,343 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:25:07,344 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:25:07,346 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:25:07,346 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:25:07,347 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:25:07,347 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:25:07,347 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:25:07,348 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:25:07,349 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:25:07,350 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 00:25:07,400 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:25:07,401 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:25:07,402 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:25:07,402 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:25:07,410 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:25:07,411 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:25:07,411 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:25:07,411 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:25:07,411 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:25:07,412 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:25:07,413 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:25:07,413 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:25:07,413 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:25:07,414 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:25:07,414 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:25:07,414 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:25:07,415 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:25:07,415 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:25:07,416 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:25:07,416 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:25:07,416 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:25:07,417 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:25:07,417 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:25:07,417 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 00:25:07,417 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:25:07,418 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 00:25:07,418 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:25:07,418 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 00:25:07,418 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:25:07,419 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 00:25:07,419 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:25:07,419 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:25:07,420 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:25:07,420 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:25:07,420 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:25:07,420 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 00:25:07,421 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:25:07,421 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:25:07,421 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 00:25:07,421 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:25:07,422 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:25:07,422 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_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 95f89ee6bcff8f17eb3e93b344abecdfb8ddea0894d1b25afafccf6235d7ced6 [2021-11-21 00:25:07,794 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:25:07,829 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:25:07,832 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:25:07,834 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:25:07,835 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:25:07,836 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/bitvector/soft_float_3a.c.cil.c [2021-11-21 00:25:07,914 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/data/2677f3ead/c0e3f80e30994cf8b86a1f191041d518/FLAGb6c554297 [2021-11-21 00:25:08,482 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:25:08,483 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/sv-benchmarks/c/bitvector/soft_float_3a.c.cil.c [2021-11-21 00:25:08,494 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/data/2677f3ead/c0e3f80e30994cf8b86a1f191041d518/FLAGb6c554297 [2021-11-21 00:25:08,801 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/data/2677f3ead/c0e3f80e30994cf8b86a1f191041d518 [2021-11-21 00:25:08,804 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:25:08,806 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:25:08,809 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:25:08,809 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:25:08,814 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:25:08,815 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:25:08" (1/1) ... [2021-11-21 00:25:08,819 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5dbd1b63 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:25:08, skipping insertion in model container [2021-11-21 00:25:08,819 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:25:08" (1/1) ... [2021-11-21 00:25:08,833 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:25:08,878 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:25:09,084 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_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/sv-benchmarks/c/bitvector/soft_float_3a.c.cil.c[728,741] [2021-11-21 00:25:09,144 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:25:09,157 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:25:09,168 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_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/sv-benchmarks/c/bitvector/soft_float_3a.c.cil.c[728,741] [2021-11-21 00:25:09,201 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:25:09,217 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:25:09,217 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:25:09 WrapperNode [2021-11-21 00:25:09,218 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:25:09,219 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:25:09,219 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:25:09,219 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:25:09,228 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:25:09" (1/1) ... [2021-11-21 00:25:09,238 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:25:09" (1/1) ... [2021-11-21 00:25:09,262 INFO L137 Inliner]: procedures = 17, calls = 15, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 112 [2021-11-21 00:25:09,263 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:25:09,263 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:25:09,264 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:25:09,264 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:25:09,274 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:25:09" (1/1) ... [2021-11-21 00:25:09,274 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:25:09" (1/1) ... [2021-11-21 00:25:09,277 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:25:09" (1/1) ... [2021-11-21 00:25:09,278 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:25:09" (1/1) ... [2021-11-21 00:25:09,285 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:25:09" (1/1) ... [2021-11-21 00:25:09,291 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:25:09" (1/1) ... [2021-11-21 00:25:09,308 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:25:09" (1/1) ... [2021-11-21 00:25:09,311 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:25:09,312 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:25:09,312 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:25:09,313 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:25:09,314 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:25:09" (1/1) ... [2021-11-21 00:25:09,338 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:25:09,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:25:09,376 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:25:09,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:25:09,438 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:25:09,438 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 00:25:09,438 INFO L130 BoogieDeclarations]: Found specification of procedure base2flt [2021-11-21 00:25:09,439 INFO L138 BoogieDeclarations]: Found implementation of procedure base2flt [2021-11-21 00:25:09,439 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:25:09,439 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:25:09,440 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-21 00:25:09,440 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-21 00:25:09,515 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:25:09,517 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:25:09,872 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:25:09,954 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:25:09,955 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-21 00:25:09,958 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:25:09 BoogieIcfgContainer [2021-11-21 00:25:09,958 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:25:09,960 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:25:09,960 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:25:09,970 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:25:09,970 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:25:08" (1/3) ... [2021-11-21 00:25:09,971 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@42329c69 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:25:09, skipping insertion in model container [2021-11-21 00:25:09,971 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:25:09" (2/3) ... [2021-11-21 00:25:09,972 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@42329c69 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:25:09, skipping insertion in model container [2021-11-21 00:25:09,972 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:25:09" (3/3) ... [2021-11-21 00:25:09,973 INFO L111 eAbstractionObserver]: Analyzing ICFG soft_float_3a.c.cil.c [2021-11-21 00:25:09,981 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:25:09,985 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 00:25:10,055 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:25:10,084 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 00:25:10,084 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 00:25:10,108 INFO L276 IsEmpty]: Start isEmpty. Operand has 39 states, 30 states have (on average 1.5666666666666667) internal successors, (47), 32 states have internal predecessors, (47), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-21 00:25:10,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-21 00:25:10,118 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:25:10,119 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:25:10,120 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:25:10,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:25:10,127 INFO L85 PathProgramCache]: Analyzing trace with hash 309625488, now seen corresponding path program 1 times [2021-11-21 00:25:10,137 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:25:10,139 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1709101478] [2021-11-21 00:25:10,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:10,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:25:10,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:10,553 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 00:25:10,554 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:25:10,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1709101478] [2021-11-21 00:25:10,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1709101478] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:25:10,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1808998528] [2021-11-21 00:25:10,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:10,556 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:25:10,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:25:10,558 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:25:10,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:25:10,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:10,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-21 00:25:10,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:25:11,119 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:25:11,119 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:25:11,608 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-21 00:25:11,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1808998528] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:25:11,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1983828105] [2021-11-21 00:25:11,656 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2021-11-21 00:25:11,656 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:25:11,665 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:25:11,674 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:25:11,674 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:25:12,593 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 58 for LOIs [2021-11-21 00:25:12,969 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:25:13,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1983828105] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:25:13,726 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:25:13,726 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [4, 13, 11] total 28 [2021-11-21 00:25:13,729 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1368474735] [2021-11-21 00:25:13,730 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:25:13,735 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 00:25:13,735 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:25:13,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 00:25:13,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=667, Unknown=0, NotChecked=0, Total=756 [2021-11-21 00:25:13,764 INFO L87 Difference]: Start difference. First operand has 39 states, 30 states have (on average 1.5666666666666667) internal successors, (47), 32 states have internal predecessors, (47), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 9 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-21 00:25:14,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:25:14,175 INFO L93 Difference]: Finished difference Result 108 states and 170 transitions. [2021-11-21 00:25:14,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-21 00:25:14,178 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 32 [2021-11-21 00:25:14,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:25:14,189 INFO L225 Difference]: With dead ends: 108 [2021-11-21 00:25:14,189 INFO L226 Difference]: Without dead ends: 65 [2021-11-21 00:25:14,199 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=89, Invalid=667, Unknown=0, NotChecked=0, Total=756 [2021-11-21 00:25:14,203 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 55 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 267 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:25:14,204 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 267 Invalid, 196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:25:14,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-21 00:25:14,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 48. [2021-11-21 00:25:14,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 39 states have (on average 1.3846153846153846) internal successors, (54), 40 states have internal predecessors, (54), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-21 00:25:14,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 64 transitions. [2021-11-21 00:25:14,254 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 64 transitions. Word has length 32 [2021-11-21 00:25:14,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:25:14,255 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 64 transitions. [2021-11-21 00:25:14,255 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-21 00:25:14,255 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 64 transitions. [2021-11-21 00:25:14,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-21 00:25:14,258 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:25:14,259 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 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 00:25:14,307 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:25:14,474 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:25:14,474 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:25:14,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:25:14,475 INFO L85 PathProgramCache]: Analyzing trace with hash 1642942643, now seen corresponding path program 1 times [2021-11-21 00:25:14,475 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:25:14,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1704170466] [2021-11-21 00:25:14,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:14,477 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:25:14,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:14,589 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 00:25:14,591 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:25:14,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1704170466] [2021-11-21 00:25:14,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1704170466] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:25:14,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1839262622] [2021-11-21 00:25:14,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:14,596 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:25:14,596 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:25:14,607 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:25:14,618 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:25:14,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:14,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-21 00:25:14,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:25:15,013 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:25:15,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:25:15,400 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-21 00:25:15,401 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1839262622] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:25:15,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1927657626] [2021-11-21 00:25:15,405 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-21 00:25:15,405 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:25:15,406 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:25:15,406 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:25:15,406 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:25:16,248 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 58 for LOIs [2021-11-21 00:25:16,938 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:25:17,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1927657626] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:25:17,879 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:25:17,880 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [5, 13, 11] total 31 [2021-11-21 00:25:17,880 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2042468020] [2021-11-21 00:25:17,880 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:25:17,881 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-21 00:25:17,882 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:25:17,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-21 00:25:17,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=821, Unknown=0, NotChecked=0, Total=930 [2021-11-21 00:25:17,883 INFO L87 Difference]: Start difference. First operand 48 states and 64 transitions. Second operand has 11 states, 8 states have (on average 2.5) internal successors, (20), 8 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-21 00:25:18,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:25:18,272 INFO L93 Difference]: Finished difference Result 114 states and 158 transitions. [2021-11-21 00:25:18,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 00:25:18,273 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 8 states have (on average 2.5) internal successors, (20), 8 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 37 [2021-11-21 00:25:18,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:25:18,275 INFO L225 Difference]: With dead ends: 114 [2021-11-21 00:25:18,276 INFO L226 Difference]: Without dead ends: 68 [2021-11-21 00:25:18,277 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 224 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=109, Invalid=821, Unknown=0, NotChecked=0, Total=930 [2021-11-21 00:25:18,279 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 54 mSDsluCounter, 291 mSDsCounter, 0 mSdLazyCounter, 250 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 306 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:25:18,279 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 306 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 250 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:25:18,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-21 00:25:18,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 51. [2021-11-21 00:25:18,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 42 states have (on average 1.3571428571428572) internal successors, (57), 43 states have internal predecessors, (57), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-21 00:25:18,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 67 transitions. [2021-11-21 00:25:18,293 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 67 transitions. Word has length 37 [2021-11-21 00:25:18,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:25:18,294 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 67 transitions. [2021-11-21 00:25:18,294 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 8 states have (on average 2.5) internal successors, (20), 8 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-21 00:25:18,294 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 67 transitions. [2021-11-21 00:25:18,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-21 00:25:18,296 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:25:18,296 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 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] [2021-11-21 00:25:18,332 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-21 00:25:18,518 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-21 00:25:18,518 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:25:18,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:25:18,519 INFO L85 PathProgramCache]: Analyzing trace with hash -779990973, now seen corresponding path program 1 times [2021-11-21 00:25:18,519 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:25:18,519 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1678524160] [2021-11-21 00:25:18,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:18,520 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:25:18,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:18,658 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 00:25:18,659 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:25:18,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1678524160] [2021-11-21 00:25:18,660 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1678524160] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:25:18,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1271803306] [2021-11-21 00:25:18,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:18,661 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:25:18,662 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:25:18,670 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:25:18,672 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:25:18,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:18,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-21 00:25:18,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:25:18,999 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-21 00:25:19,000 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:25:19,360 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 00:25:19,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1271803306] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:25:19,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [330492041] [2021-11-21 00:25:19,364 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-21 00:25:19,364 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:25:19,365 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:25:19,365 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:25:19,365 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:25:22,580 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2021-11-21 00:25:22,714 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 14 for LOIs [2021-11-21 00:25:23,530 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:25:25,145 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:25:25,146 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:25:25,146 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 13, 11] total 23 [2021-11-21 00:25:25,146 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292143131] [2021-11-21 00:25:25,147 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:25:25,147 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-21 00:25:25,148 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:25:25,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-21 00:25:25,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1353, Unknown=0, NotChecked=0, Total=1482 [2021-11-21 00:25:25,150 INFO L87 Difference]: Start difference. First operand 51 states and 67 transitions. Second operand has 23 states, 20 states have (on average 2.6) internal successors, (52), 20 states have internal predecessors, (52), 5 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (10), 6 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-21 00:25:25,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:25:25,871 INFO L93 Difference]: Finished difference Result 157 states and 218 transitions. [2021-11-21 00:25:25,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-21 00:25:25,875 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 20 states have (on average 2.6) internal successors, (52), 20 states have internal predecessors, (52), 5 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (10), 6 states have call predecessors, (10), 4 states have call successors, (10) Word has length 40 [2021-11-21 00:25:25,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:25:25,879 INFO L225 Difference]: With dead ends: 157 [2021-11-21 00:25:25,881 INFO L226 Difference]: Without dead ends: 100 [2021-11-21 00:25:25,886 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 87 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 672 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=264, Invalid=2492, Unknown=0, NotChecked=0, Total=2756 [2021-11-21 00:25:25,890 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 86 mSDsluCounter, 585 mSDsCounter, 0 mSdLazyCounter, 434 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 593 SdHoareTripleChecker+Invalid, 450 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 434 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:25:25,898 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 593 Invalid, 450 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 434 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:25:25,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-21 00:25:25,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 62. [2021-11-21 00:25:25,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 51 states have (on average 1.3137254901960784) internal successors, (67), 51 states have internal predecessors, (67), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (8), 6 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-21 00:25:25,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 81 transitions. [2021-11-21 00:25:25,941 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 81 transitions. Word has length 40 [2021-11-21 00:25:25,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:25:25,943 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 81 transitions. [2021-11-21 00:25:25,944 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 20 states have (on average 2.6) internal successors, (52), 20 states have internal predecessors, (52), 5 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (10), 6 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-21 00:25:25,944 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 81 transitions. [2021-11-21 00:25:25,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-21 00:25:25,948 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:25:25,948 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 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 00:25:26,008 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:25:26,190 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:25:26,190 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:25:26,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:25:26,191 INFO L85 PathProgramCache]: Analyzing trace with hash -194318023, now seen corresponding path program 1 times [2021-11-21 00:25:26,191 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:25:26,191 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141374247] [2021-11-21 00:25:26,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:26,192 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:25:26,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:26,310 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 00:25:26,310 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:25:26,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141374247] [2021-11-21 00:25:26,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [141374247] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:25:26,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1550103739] [2021-11-21 00:25:26,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:26,312 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:25:26,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:25:26,314 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:25:26,322 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:25:26,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:26,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 00:25:26,381 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:25:26,474 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 19 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 00:25:26,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:25:26,630 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 00:25:26,631 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1550103739] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:25:26,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1335918403] [2021-11-21 00:25:26,636 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-21 00:25:26,636 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:25:26,636 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:25:26,637 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:25:26,637 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:25:28,461 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 14 for LOIs [2021-11-21 00:25:29,140 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:25:29,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1335918403] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:25:29,923 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:25:29,923 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [6, 6, 6] total 30 [2021-11-21 00:25:29,923 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [925210465] [2021-11-21 00:25:29,924 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:25:29,924 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-21 00:25:29,925 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:25:29,925 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-21 00:25:29,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=721, Unknown=0, NotChecked=0, Total=870 [2021-11-21 00:25:29,926 INFO L87 Difference]: Start difference. First operand 62 states and 81 transitions. Second operand has 18 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 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 00:25:30,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:25:30,873 INFO L93 Difference]: Finished difference Result 120 states and 176 transitions. [2021-11-21 00:25:30,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-21 00:25:30,874 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 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 42 [2021-11-21 00:25:30,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:25:30,876 INFO L225 Difference]: With dead ends: 120 [2021-11-21 00:25:30,876 INFO L226 Difference]: Without dead ends: 105 [2021-11-21 00:25:30,878 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 452 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=238, Invalid=1022, Unknown=0, NotChecked=0, Total=1260 [2021-11-21 00:25:30,879 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 112 mSDsluCounter, 312 mSDsCounter, 0 mSdLazyCounter, 468 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 340 SdHoareTripleChecker+Invalid, 495 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 468 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:25:30,880 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 340 Invalid, 495 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 468 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 00:25:30,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-11-21 00:25:30,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 68. [2021-11-21 00:25:30,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 54 states have (on average 1.2962962962962963) internal successors, (70), 55 states have internal predecessors, (70), 8 states have call successors, (8), 4 states have call predecessors, (8), 5 states have return successors, (12), 8 states have call predecessors, (12), 7 states have call successors, (12) [2021-11-21 00:25:30,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 90 transitions. [2021-11-21 00:25:30,901 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 90 transitions. Word has length 42 [2021-11-21 00:25:30,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:25:30,902 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 90 transitions. [2021-11-21 00:25:30,902 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 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 00:25:30,902 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 90 transitions. [2021-11-21 00:25:30,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-21 00:25:30,905 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:25:30,905 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 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, 1] [2021-11-21 00:25:30,948 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 00:25:31,130 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:25:31,130 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:25:31,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:25:31,131 INFO L85 PathProgramCache]: Analyzing trace with hash -1442386312, now seen corresponding path program 1 times [2021-11-21 00:25:31,131 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:25:31,131 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [533994856] [2021-11-21 00:25:31,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:31,132 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:25:31,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:31,282 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 00:25:31,282 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:25:31,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [533994856] [2021-11-21 00:25:31,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [533994856] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:25:31,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1830546052] [2021-11-21 00:25:31,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:31,283 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:25:31,283 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:25:31,284 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:25:31,288 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 00:25:31,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:31,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-21 00:25:31,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:25:31,533 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-21 00:25:31,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:25:32,018 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-21 00:25:32,018 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1830546052] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 00:25:32,018 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:25:32,018 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7, 10] total 19 [2021-11-21 00:25:32,019 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693328018] [2021-11-21 00:25:32,019 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:25:32,019 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:25:32,019 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:25:32,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:25:32,020 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=289, Unknown=0, NotChecked=0, Total=342 [2021-11-21 00:25:32,020 INFO L87 Difference]: Start difference. First operand 68 states and 90 transitions. Second operand has 6 states, 5 states have (on average 4.8) internal successors, (24), 5 states have internal predecessors, (24), 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 00:25:32,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:25:32,131 INFO L93 Difference]: Finished difference Result 90 states and 118 transitions. [2021-11-21 00:25:32,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:25:32,131 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.8) internal successors, (24), 5 states have internal predecessors, (24), 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 44 [2021-11-21 00:25:32,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:25:32,133 INFO L225 Difference]: With dead ends: 90 [2021-11-21 00:25:32,133 INFO L226 Difference]: Without dead ends: 73 [2021-11-21 00:25:32,134 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2021-11-21 00:25:32,135 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 4 mSDsluCounter, 175 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 208 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:25:32,136 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 208 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:25:32,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-11-21 00:25:32,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 64. [2021-11-21 00:25:32,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 53 states have (on average 1.3018867924528301) internal successors, (69), 52 states have internal predecessors, (69), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (7), 7 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-21 00:25:32,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 82 transitions. [2021-11-21 00:25:32,151 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 82 transitions. Word has length 44 [2021-11-21 00:25:32,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:25:32,152 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 82 transitions. [2021-11-21 00:25:32,152 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.8) internal successors, (24), 5 states have internal predecessors, (24), 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 00:25:32,152 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 82 transitions. [2021-11-21 00:25:32,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-21 00:25:32,154 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:25:32,154 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 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, 1, 1] [2021-11-21 00:25:32,192 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 00:25:32,370 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:25:32,370 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:25:32,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:25:32,371 INFO L85 PathProgramCache]: Analyzing trace with hash -929368441, now seen corresponding path program 1 times [2021-11-21 00:25:32,371 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:25:32,371 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944068265] [2021-11-21 00:25:32,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:32,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:25:32,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:32,460 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 3 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 00:25:32,461 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:25:32,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944068265] [2021-11-21 00:25:32,461 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1944068265] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:25:32,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [875436366] [2021-11-21 00:25:32,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:32,464 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:25:32,464 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:25:32,465 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:25:32,489 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 00:25:32,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:32,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 00:25:32,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:25:32,649 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 00:25:32,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:25:32,844 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 3 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 00:25:32,844 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [875436366] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:25:32,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1248682157] [2021-11-21 00:25:32,847 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-21 00:25:32,847 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:25:32,848 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:25:32,848 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:25:32,848 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:25:36,216 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2021-11-21 00:25:36,364 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 14 for LOIs [2021-11-21 00:25:38,206 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:25:39,033 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:25:39,034 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:25:39,034 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 14 [2021-11-21 00:25:39,034 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [207965016] [2021-11-21 00:25:39,034 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:25:39,035 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-21 00:25:39,035 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:25:39,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-21 00:25:39,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=704, Unknown=0, NotChecked=0, Total=870 [2021-11-21 00:25:39,037 INFO L87 Difference]: Start difference. First operand 64 states and 82 transitions. Second operand has 14 states, 14 states have (on average 4.5) internal successors, (63), 14 states have internal predecessors, (63), 2 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-21 00:25:39,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:25:39,309 INFO L93 Difference]: Finished difference Result 182 states and 256 transitions. [2021-11-21 00:25:39,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 00:25:39,310 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.5) internal successors, (63), 14 states have internal predecessors, (63), 2 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 45 [2021-11-21 00:25:39,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:25:39,313 INFO L225 Difference]: With dead ends: 182 [2021-11-21 00:25:39,313 INFO L226 Difference]: Without dead ends: 137 [2021-11-21 00:25:39,314 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=236, Invalid=954, Unknown=0, NotChecked=0, Total=1190 [2021-11-21 00:25:39,315 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 73 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:25:39,315 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 223 Invalid, 167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:25:39,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-11-21 00:25:39,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 75. [2021-11-21 00:25:39,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 64 states have (on average 1.296875) internal successors, (83), 63 states have internal predecessors, (83), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (7), 7 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-21 00:25:39,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 96 transitions. [2021-11-21 00:25:39,339 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 96 transitions. Word has length 45 [2021-11-21 00:25:39,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:25:39,340 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 96 transitions. [2021-11-21 00:25:39,340 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.5) internal successors, (63), 14 states have internal predecessors, (63), 2 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-21 00:25:39,340 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 96 transitions. [2021-11-21 00:25:39,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-21 00:25:39,343 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:25:39,343 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 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, 1] [2021-11-21 00:25:39,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 00:25:39,566 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-21 00:25:39,566 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:25:39,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:25:39,567 INFO L85 PathProgramCache]: Analyzing trace with hash -599884568, now seen corresponding path program 1 times [2021-11-21 00:25:39,567 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:25:39,567 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2094341676] [2021-11-21 00:25:39,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:39,567 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:25:39,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:39,706 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 3 proven. 17 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 00:25:39,707 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:25:39,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2094341676] [2021-11-21 00:25:39,707 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2094341676] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:25:39,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [519240296] [2021-11-21 00:25:39,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:39,708 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:25:39,708 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:25:39,709 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:25:39,730 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85a583f9-12c3-4ea1-8b89-56a802bbbeaf/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 00:25:39,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:39,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-21 00:25:39,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:25:39,896 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 21 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 00:25:39,897 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:25:40,137 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 3 proven. 17 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 00:25:40,137 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [519240296] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:25:40,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [631713281] [2021-11-21 00:25:40,140 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-21 00:25:40,140 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:25:40,140 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:25:40,140 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:25:40,141 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs