./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 38b53e6a Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur --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 538775af36be57be36a6cd470d0ff7a3d7714753249a7d4cb9a7b907cdacda78 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-38b53e6 [2022-11-26 00:39:12,124 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-26 00:39:12,126 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-26 00:39:12,149 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-26 00:39:12,152 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-26 00:39:12,155 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-26 00:39:12,161 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-26 00:39:12,165 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-26 00:39:12,167 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-26 00:39:12,173 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-26 00:39:12,175 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-26 00:39:12,176 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-26 00:39:12,177 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-26 00:39:12,180 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-26 00:39:12,183 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-26 00:39:12,185 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-26 00:39:12,186 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-26 00:39:12,187 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-26 00:39:12,188 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-26 00:39:12,189 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-26 00:39:12,191 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-26 00:39:12,192 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-26 00:39:12,193 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-26 00:39:12,194 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-26 00:39:12,197 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-26 00:39:12,198 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-26 00:39:12,198 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-26 00:39:12,199 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-26 00:39:12,200 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-26 00:39:12,201 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-26 00:39:12,201 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-26 00:39:12,202 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-26 00:39:12,203 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-26 00:39:12,204 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-26 00:39:12,205 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-26 00:39:12,205 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-26 00:39:12,206 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-26 00:39:12,206 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-26 00:39:12,207 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-26 00:39:12,208 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-26 00:39:12,208 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-26 00:39:12,210 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-26 00:39:12,245 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-26 00:39:12,248 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-26 00:39:12,249 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-26 00:39:12,249 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-26 00:39:12,250 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-26 00:39:12,250 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-26 00:39:12,250 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-26 00:39:12,251 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-26 00:39:12,251 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-26 00:39:12,252 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-26 00:39:12,253 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-26 00:39:12,253 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-26 00:39:12,253 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-26 00:39:12,254 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-26 00:39:12,254 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-26 00:39:12,254 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-26 00:39:12,254 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-26 00:39:12,255 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-26 00:39:12,255 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-26 00:39:12,256 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-26 00:39:12,256 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-26 00:39:12,256 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-26 00:39:12,257 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-26 00:39:12,257 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-26 00:39:12,257 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-26 00:39:12,257 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-26 00:39:12,258 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-26 00:39:12,258 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-26 00:39:12,259 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-26 00:39:12,259 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-26 00:39:12,259 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-26 00:39:12,259 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-26 00:39:12,260 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-26 00:39:12,260 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-26 00:39:12,260 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-26 00:39:12,261 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-26 00:39:12,261 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-26 00:39:12,261 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-26 00:39:12,261 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-26 00:39:12,262 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-26 00:39:12,262 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-26 00:39:12,262 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 538775af36be57be36a6cd470d0ff7a3d7714753249a7d4cb9a7b907cdacda78 [2022-11-26 00:39:12,552 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-26 00:39:12,589 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-26 00:39:12,591 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-26 00:39:12,592 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-26 00:39:12,593 INFO L275 PluginConnector]: CDTParser initialized [2022-11-26 00:39:12,594 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c [2022-11-26 00:39:15,706 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-26 00:39:15,967 INFO L351 CDTParser]: Found 1 translation units. [2022-11-26 00:39:15,968 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c [2022-11-26 00:39:15,975 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/data/8baf9f84d/8ec0fed613b145bdba328a81bbe38f71/FLAG6900fc4a6 [2022-11-26 00:39:15,994 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/data/8baf9f84d/8ec0fed613b145bdba328a81bbe38f71 [2022-11-26 00:39:16,000 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-26 00:39:16,002 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-26 00:39:16,008 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-26 00:39:16,009 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-26 00:39:16,012 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-26 00:39:16,013 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 12:39:15" (1/1) ... [2022-11-26 00:39:16,014 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@740b491b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:39:16, skipping insertion in model container [2022-11-26 00:39:16,015 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 12:39:15" (1/1) ... [2022-11-26 00:39:16,023 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-26 00:39:16,038 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-26 00:39:16,201 WARN L237 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_62483aff-265e-4205-b13c-6c2ea22f8b94/sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c[319,332] [2022-11-26 00:39:16,223 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-26 00:39:16,233 INFO L203 MainTranslator]: Completed pre-run [2022-11-26 00:39:16,246 WARN L237 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_62483aff-265e-4205-b13c-6c2ea22f8b94/sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c[319,332] [2022-11-26 00:39:16,254 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-26 00:39:16,272 INFO L208 MainTranslator]: Completed translation [2022-11-26 00:39:16,273 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:39:16 WrapperNode [2022-11-26 00:39:16,273 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-26 00:39:16,275 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-26 00:39:16,275 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-26 00:39:16,275 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-26 00:39:16,282 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:39:16" (1/1) ... [2022-11-26 00:39:16,289 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:39:16" (1/1) ... [2022-11-26 00:39:16,308 INFO L138 Inliner]: procedures = 12, calls = 9, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 43 [2022-11-26 00:39:16,308 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-26 00:39:16,309 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-26 00:39:16,309 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-26 00:39:16,310 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-26 00:39:16,320 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:39:16" (1/1) ... [2022-11-26 00:39:16,320 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:39:16" (1/1) ... [2022-11-26 00:39:16,331 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:39:16" (1/1) ... [2022-11-26 00:39:16,332 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:39:16" (1/1) ... [2022-11-26 00:39:16,335 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:39:16" (1/1) ... [2022-11-26 00:39:16,341 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:39:16" (1/1) ... [2022-11-26 00:39:16,348 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:39:16" (1/1) ... [2022-11-26 00:39:16,349 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:39:16" (1/1) ... [2022-11-26 00:39:16,351 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-26 00:39:16,352 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-26 00:39:16,353 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-26 00:39:16,353 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-26 00:39:16,354 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:39:16" (1/1) ... [2022-11-26 00:39:16,360 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-26 00:39:16,371 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:39:16,388 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-26 00:39:16,418 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-26 00:39:16,436 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-26 00:39:16,437 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-26 00:39:16,437 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-26 00:39:16,437 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-26 00:39:16,437 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-26 00:39:16,438 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-26 00:39:16,510 INFO L235 CfgBuilder]: Building ICFG [2022-11-26 00:39:16,512 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-26 00:39:16,700 INFO L276 CfgBuilder]: Performing block encoding [2022-11-26 00:39:16,739 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-26 00:39:16,745 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-26 00:39:16,748 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 12:39:16 BoogieIcfgContainer [2022-11-26 00:39:16,749 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-26 00:39:16,753 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-26 00:39:16,753 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-26 00:39:16,756 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-26 00:39:16,757 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.11 12:39:15" (1/3) ... [2022-11-26 00:39:16,758 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35b62560 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 12:39:16, skipping insertion in model container [2022-11-26 00:39:16,758 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:39:16" (2/3) ... [2022-11-26 00:39:16,760 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35b62560 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 12:39:16, skipping insertion in model container [2022-11-26 00:39:16,760 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 12:39:16" (3/3) ... [2022-11-26 00:39:16,765 INFO L112 eAbstractionObserver]: Analyzing ICFG mono-crafted_14.c [2022-11-26 00:39:16,786 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-26 00:39:16,787 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-26 00:39:16,850 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-26 00:39:16,857 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@36043ef9, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-26 00:39:16,858 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-26 00:39:16,863 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 8 states have (on average 1.5) internal successors, (12), 9 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-26 00:39:16,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-26 00:39:16,871 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:39:16,872 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:39:16,872 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:39:16,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:39:16,880 INFO L85 PathProgramCache]: Analyzing trace with hash -1099884338, now seen corresponding path program 1 times [2022-11-26 00:39:16,893 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:39:16,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [365430795] [2022-11-26 00:39:16,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:39:16,895 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:39:17,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:39:17,218 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:39:17,219 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:39:17,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [365430795] [2022-11-26 00:39:17,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [365430795] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:39:17,221 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 00:39:17,222 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-26 00:39:17,224 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [433789840] [2022-11-26 00:39:17,225 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:39:17,230 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-26 00:39:17,231 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:39:17,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-26 00:39:17,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-26 00:39:17,314 INFO L87 Difference]: Start difference. First operand has 13 states, 8 states have (on average 1.5) internal successors, (12), 9 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:39:17,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:39:17,390 INFO L93 Difference]: Finished difference Result 25 states and 33 transitions. [2022-11-26 00:39:17,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-26 00:39:17,394 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-26 00:39:17,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:39:17,405 INFO L225 Difference]: With dead ends: 25 [2022-11-26 00:39:17,405 INFO L226 Difference]: Without dead ends: 12 [2022-11-26 00:39:17,410 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-26 00:39:17,419 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-26 00:39:17,422 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-26 00:39:17,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2022-11-26 00:39:17,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2022-11-26 00:39:17,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 8 states have (on average 1.375) internal successors, (11), 9 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-26 00:39:17,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2022-11-26 00:39:17,475 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 7 [2022-11-26 00:39:17,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:39:17,477 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2022-11-26 00:39:17,477 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:39:17,478 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2022-11-26 00:39:17,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-26 00:39:17,480 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:39:17,480 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:39:17,481 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-26 00:39:17,481 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:39:17,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:39:17,484 INFO L85 PathProgramCache]: Analyzing trace with hash 1962003808, now seen corresponding path program 1 times [2022-11-26 00:39:17,484 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:39:17,485 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1650444847] [2022-11-26 00:39:17,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:39:17,486 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:39:17,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:39:17,660 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:39:17,660 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:39:17,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1650444847] [2022-11-26 00:39:17,661 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1650444847] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:39:17,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1350120154] [2022-11-26 00:39:17,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:39:17,662 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:39:17,662 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:39:17,666 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:39:17,675 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-26 00:39:17,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:39:17,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-26 00:39:17,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:39:17,844 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:39:17,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:39:18,027 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:39:18,032 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1350120154] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-26 00:39:18,052 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-26 00:39:18,053 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 7 [2022-11-26 00:39:18,056 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496608589] [2022-11-26 00:39:18,056 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:39:18,059 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-26 00:39:18,060 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:39:18,063 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-26 00:39:18,063 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2022-11-26 00:39:18,065 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:39:18,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:39:18,097 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2022-11-26 00:39:18,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-26 00:39:18,098 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-26 00:39:18,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:39:18,099 INFO L225 Difference]: With dead ends: 21 [2022-11-26 00:39:18,099 INFO L226 Difference]: Without dead ends: 13 [2022-11-26 00:39:18,100 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2022-11-26 00:39:18,101 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-26 00:39:18,102 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-26 00:39:18,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-11-26 00:39:18,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-11-26 00:39:18,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 10 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-26 00:39:18,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2022-11-26 00:39:18,124 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 8 [2022-11-26 00:39:18,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:39:18,125 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2022-11-26 00:39:18,125 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:39:18,126 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2022-11-26 00:39:18,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-26 00:39:18,126 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:39:18,127 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:39:18,151 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-11-26 00:39:18,332 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:39:18,333 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:39:18,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:39:18,334 INFO L85 PathProgramCache]: Analyzing trace with hash -185367768, now seen corresponding path program 1 times [2022-11-26 00:39:18,334 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:39:18,334 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1578371281] [2022-11-26 00:39:18,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:39:18,335 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:39:18,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:39:18,451 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-26 00:39:18,451 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:39:18,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1578371281] [2022-11-26 00:39:18,454 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1578371281] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:39:18,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [207785168] [2022-11-26 00:39:18,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:39:18,456 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:39:18,457 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:39:18,458 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:39:18,477 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-26 00:39:18,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:39:18,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-26 00:39:18,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:39:18,568 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:39:18,569 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:39:18,696 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:39:18,696 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [207785168] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:39:18,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1973000506] [2022-11-26 00:39:18,716 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:39:18,716 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:39:18,720 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:39:18,726 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:39:18,727 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:39:19,220 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2022-11-26 00:39:19,245 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:39:19,438 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '233#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:39:19,439 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:39:19,439 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:39:19,439 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 4, 4] total 9 [2022-11-26 00:39:19,440 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063032167] [2022-11-26 00:39:19,452 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:39:19,453 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-26 00:39:19,453 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:39:19,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-26 00:39:19,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=184, Unknown=0, NotChecked=0, Total=240 [2022-11-26 00:39:19,455 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:39:19,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:39:19,525 INFO L93 Difference]: Finished difference Result 27 states and 34 transitions. [2022-11-26 00:39:19,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-26 00:39:19,526 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-26 00:39:19,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:39:19,527 INFO L225 Difference]: With dead ends: 27 [2022-11-26 00:39:19,527 INFO L226 Difference]: Without dead ends: 17 [2022-11-26 00:39:19,528 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=76, Invalid=230, Unknown=0, NotChecked=0, Total=306 [2022-11-26 00:39:19,529 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-26 00:39:19,529 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 45 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-26 00:39:19,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-11-26 00:39:19,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-11-26 00:39:19,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 14 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-26 00:39:19,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2022-11-26 00:39:19,534 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 9 [2022-11-26 00:39:19,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:39:19,535 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2022-11-26 00:39:19,535 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:39:19,535 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2022-11-26 00:39:19,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-26 00:39:19,536 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:39:19,536 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:39:19,548 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-26 00:39:19,741 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-11-26 00:39:19,742 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:39:19,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:39:19,743 INFO L85 PathProgramCache]: Analyzing trace with hash -1115138546, now seen corresponding path program 2 times [2022-11-26 00:39:19,743 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:39:19,743 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [138107882] [2022-11-26 00:39:19,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:39:19,743 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:39:19,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:39:19,997 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:39:19,997 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:39:19,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [138107882] [2022-11-26 00:39:19,998 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [138107882] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:39:19,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [446022386] [2022-11-26 00:39:19,998 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:39:19,998 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:39:19,998 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:39:20,000 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:39:20,019 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-26 00:39:20,061 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-26 00:39:20,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:39:20,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-26 00:39:20,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:39:20,111 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-26 00:39:20,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:39:20,209 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-26 00:39:20,209 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [446022386] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:39:20,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1546299563] [2022-11-26 00:39:20,211 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:39:20,211 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:39:20,212 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:39:20,212 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:39:20,212 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:39:20,438 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2022-11-26 00:39:20,480 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:39:20,758 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '401#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:39:20,758 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:39:20,758 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:39:20,759 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 4, 4] total 14 [2022-11-26 00:39:20,759 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1880086922] [2022-11-26 00:39:20,759 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:39:20,759 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-26 00:39:20,760 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:39:20,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-26 00:39:20,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=324, Unknown=0, NotChecked=0, Total=420 [2022-11-26 00:39:20,761 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 15 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 14 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:39:20,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:39:20,875 INFO L93 Difference]: Finished difference Result 35 states and 43 transitions. [2022-11-26 00:39:20,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-26 00:39:20,876 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 14 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-26 00:39:20,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:39:20,876 INFO L225 Difference]: With dead ends: 35 [2022-11-26 00:39:20,877 INFO L226 Difference]: Without dead ends: 22 [2022-11-26 00:39:20,877 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=148, Invalid=452, Unknown=0, NotChecked=0, Total=600 [2022-11-26 00:39:20,878 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-26 00:39:20,878 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 44 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-26 00:39:20,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-26 00:39:20,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-11-26 00:39:20,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 19 states have internal predecessors, (21), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-26 00:39:20,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2022-11-26 00:39:20,887 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 13 [2022-11-26 00:39:20,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:39:20,887 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2022-11-26 00:39:20,887 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 14 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:39:20,888 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2022-11-26 00:39:20,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-26 00:39:20,889 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:39:20,889 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:39:20,900 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-26 00:39:21,100 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:39:21,100 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:39:21,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:39:21,100 INFO L85 PathProgramCache]: Analyzing trace with hash 197422010, now seen corresponding path program 3 times [2022-11-26 00:39:21,101 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:39:21,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1120801146] [2022-11-26 00:39:21,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:39:21,101 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:39:21,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:39:21,569 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:39:21,570 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:39:21,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1120801146] [2022-11-26 00:39:21,570 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1120801146] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:39:21,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1324299699] [2022-11-26 00:39:21,570 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:39:21,571 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:39:21,571 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:39:21,572 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:39:21,577 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-26 00:39:21,630 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:39:21,630 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:39:21,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-26 00:39:21,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:39:21,763 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-26 00:39:21,763 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:39:22,071 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-26 00:39:22,071 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1324299699] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:39:22,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [560705284] [2022-11-26 00:39:22,074 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:39:22,075 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:39:22,075 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:39:22,075 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:39:22,075 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:39:22,269 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2022-11-26 00:39:22,309 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:39:22,620 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '642#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:39:22,620 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:39:22,620 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:39:22,620 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8, 8] total 27 [2022-11-26 00:39:22,621 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272632539] [2022-11-26 00:39:22,621 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:39:22,621 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-26 00:39:22,621 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:39:22,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-26 00:39:22,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=820, Unknown=0, NotChecked=0, Total=1122 [2022-11-26 00:39:22,623 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 28 states, 28 states have (on average 1.25) internal successors, (35), 27 states have internal predecessors, (35), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:39:22,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:39:22,894 INFO L93 Difference]: Finished difference Result 45 states and 57 transitions. [2022-11-26 00:39:22,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-26 00:39:22,895 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.25) internal successors, (35), 27 states have internal predecessors, (35), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2022-11-26 00:39:22,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:39:22,896 INFO L225 Difference]: With dead ends: 45 [2022-11-26 00:39:22,896 INFO L226 Difference]: Without dead ends: 31 [2022-11-26 00:39:22,897 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 344 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=478, Invalid=1244, Unknown=0, NotChecked=0, Total=1722 [2022-11-26 00:39:22,900 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:39:22,903 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 52 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:39:22,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-26 00:39:22,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-11-26 00:39:22,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 28 states have internal predecessors, (30), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-26 00:39:22,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2022-11-26 00:39:22,912 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 18 [2022-11-26 00:39:22,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:39:22,913 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2022-11-26 00:39:22,913 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.25) internal successors, (35), 27 states have internal predecessors, (35), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:39:22,914 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2022-11-26 00:39:22,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-26 00:39:22,914 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:39:22,915 INFO L195 NwaCegarLoop]: trace histogram [14, 6, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:39:22,926 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-26 00:39:23,120 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:39:23,121 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:39:23,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:39:23,121 INFO L85 PathProgramCache]: Analyzing trace with hash 958667022, now seen corresponding path program 4 times [2022-11-26 00:39:23,121 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:39:23,121 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1489530063] [2022-11-26 00:39:23,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:39:23,122 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:39:23,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:39:24,140 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:39:24,140 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:39:24,140 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1489530063] [2022-11-26 00:39:24,140 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1489530063] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:39:24,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [938624990] [2022-11-26 00:39:24,141 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:39:24,141 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:39:24,141 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:39:24,143 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:39:24,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-26 00:39:24,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:39:24,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-26 00:39:24,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:39:24,627 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-26 00:39:24,627 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:39:25,497 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-26 00:39:25,497 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [938624990] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:39:25,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [512787776] [2022-11-26 00:39:25,499 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:39:25,499 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:39:25,500 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:39:25,500 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:39:25,500 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:39:25,679 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2022-11-26 00:39:25,691 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:39:25,988 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1008#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:39:25,989 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:39:25,989 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:39:25,989 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 16, 16] total 52 [2022-11-26 00:39:25,989 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1973292124] [2022-11-26 00:39:25,989 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:39:25,990 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-11-26 00:39:25,990 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:39:25,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-11-26 00:39:25,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1101, Invalid=2321, Unknown=0, NotChecked=0, Total=3422 [2022-11-26 00:39:25,993 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand has 53 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 52 states have internal predecessors, (60), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:39:26,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:39:26,653 INFO L93 Difference]: Finished difference Result 63 states and 83 transitions. [2022-11-26 00:39:26,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-26 00:39:26,653 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 52 states have internal predecessors, (60), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2022-11-26 00:39:26,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:39:26,654 INFO L225 Difference]: With dead ends: 63 [2022-11-26 00:39:26,654 INFO L226 Difference]: Without dead ends: 48 [2022-11-26 00:39:26,657 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 913 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1725, Invalid=3825, Unknown=0, NotChecked=0, Total=5550 [2022-11-26 00:39:26,658 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:39:26,658 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 67 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:39:26,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-11-26 00:39:26,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2022-11-26 00:39:26,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 45 states have internal predecessors, (47), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-26 00:39:26,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2022-11-26 00:39:26,666 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 27 [2022-11-26 00:39:26,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:39:26,666 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2022-11-26 00:39:26,667 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 52 states have internal predecessors, (60), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:39:26,667 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2022-11-26 00:39:26,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-26 00:39:26,668 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:39:26,668 INFO L195 NwaCegarLoop]: trace histogram [30, 7, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:39:26,675 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-26 00:39:26,874 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:39:26,874 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:39:26,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:39:26,875 INFO L85 PathProgramCache]: Analyzing trace with hash -1819206854, now seen corresponding path program 5 times [2022-11-26 00:39:26,875 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:39:26,875 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [849836557] [2022-11-26 00:39:26,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:39:26,876 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:39:26,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:39:29,820 INFO L134 CoverageAnalysis]: Checked inductivity of 493 backedges. 0 proven. 493 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:39:29,821 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:39:29,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [849836557] [2022-11-26 00:39:29,821 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [849836557] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:39:29,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1368823367] [2022-11-26 00:39:29,821 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:39:29,821 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:39:29,822 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:39:29,826 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:39:29,851 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-26 00:39:29,933 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-11-26 00:39:29,933 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:39:29,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-26 00:39:29,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:39:31,376 INFO L134 CoverageAnalysis]: Checked inductivity of 493 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-26 00:39:31,376 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:39:34,426 INFO L134 CoverageAnalysis]: Checked inductivity of 493 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-26 00:39:34,426 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1368823367] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:39:34,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1692115461] [2022-11-26 00:39:34,428 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:39:34,429 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:39:34,429 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:39:34,429 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:39:34,429 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:39:34,649 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2022-11-26 00:39:34,664 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:39:35,079 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1611#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:39:35,079 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:39:35,079 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:39:35,079 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 32, 32] total 101 [2022-11-26 00:39:35,079 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [58756839] [2022-11-26 00:39:35,080 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:39:35,080 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 102 states [2022-11-26 00:39:35,081 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:39:35,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2022-11-26 00:39:35,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4245, Invalid=7311, Unknown=0, NotChecked=0, Total=11556 [2022-11-26 00:39:35,088 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand has 102 states, 102 states have (on average 1.0686274509803921) internal successors, (109), 101 states have internal predecessors, (109), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:39:37,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:39:37,165 INFO L93 Difference]: Finished difference Result 97 states and 133 transitions. [2022-11-26 00:39:37,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2022-11-26 00:39:37,165 INFO L78 Accepts]: Start accepts. Automaton has has 102 states, 102 states have (on average 1.0686274509803921) internal successors, (109), 101 states have internal predecessors, (109), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2022-11-26 00:39:37,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:39:37,166 INFO L225 Difference]: With dead ends: 97 [2022-11-26 00:39:37,167 INFO L226 Difference]: Without dead ends: 81 [2022-11-26 00:39:37,172 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2654 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=6549, Invalid=12911, Unknown=0, NotChecked=0, Total=19460 [2022-11-26 00:39:37,173 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:39:37,173 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 101 Invalid, 236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 00:39:37,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-11-26 00:39:37,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2022-11-26 00:39:37,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 77 states have (on average 1.0389610389610389) internal successors, (80), 78 states have internal predecessors, (80), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-26 00:39:37,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 83 transitions. [2022-11-26 00:39:37,184 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 83 transitions. Word has length 44 [2022-11-26 00:39:37,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:39:37,185 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 83 transitions. [2022-11-26 00:39:37,185 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 102 states, 102 states have (on average 1.0686274509803921) internal successors, (109), 101 states have internal predecessors, (109), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:39:37,185 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 83 transitions. [2022-11-26 00:39:37,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-11-26 00:39:37,187 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:39:37,187 INFO L195 NwaCegarLoop]: trace histogram [62, 8, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:39:37,198 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-26 00:39:37,393 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:39:37,393 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:39:37,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:39:37,394 INFO L85 PathProgramCache]: Analyzing trace with hash 1277203598, now seen corresponding path program 6 times [2022-11-26 00:39:37,394 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:39:37,394 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [860013720] [2022-11-26 00:39:37,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:39:37,395 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:39:37,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:39:45,995 INFO L134 CoverageAnalysis]: Checked inductivity of 1989 backedges. 0 proven. 1989 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:39:45,995 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:39:45,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [860013720] [2022-11-26 00:39:45,996 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [860013720] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:39:45,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [386715754] [2022-11-26 00:39:45,996 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:39:45,996 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:39:45,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:39:45,999 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:39:46,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-26 00:39:46,118 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:39:46,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:39:46,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 64 conjunts are in the unsatisfiable core [2022-11-26 00:39:46,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:39:50,885 INFO L134 CoverageAnalysis]: Checked inductivity of 1989 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-26 00:39:50,886 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:40:00,626 INFO L134 CoverageAnalysis]: Checked inductivity of 1989 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-26 00:40:00,627 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [386715754] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:40:00,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [96580537] [2022-11-26 00:40:00,628 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:40:00,629 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:40:00,629 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:40:00,629 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:40:00,629 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:40:00,808 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2022-11-26 00:40:00,831 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:40:01,649 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2675#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:40:01,649 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:40:01,650 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:40:01,650 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 64, 64] total 198 [2022-11-26 00:40:01,650 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725147774] [2022-11-26 00:40:01,650 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:40:01,651 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 199 states [2022-11-26 00:40:01,651 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:40:01,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 199 interpolants. [2022-11-26 00:40:01,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16702, Invalid=25118, Unknown=0, NotChecked=0, Total=41820 [2022-11-26 00:40:01,666 INFO L87 Difference]: Start difference. First operand 81 states and 83 transitions. Second operand has 199 states, 199 states have (on average 1.035175879396985) internal successors, (206), 198 states have internal predecessors, (206), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:40:08,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:40:08,722 INFO L93 Difference]: Finished difference Result 163 states and 231 transitions. [2022-11-26 00:40:08,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2022-11-26 00:40:08,727 INFO L78 Accepts]: Start accepts. Automaton has has 199 states, 199 states have (on average 1.035175879396985) internal successors, (206), 198 states have internal predecessors, (206), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 77 [2022-11-26 00:40:08,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:40:08,730 INFO L225 Difference]: With dead ends: 163 [2022-11-26 00:40:08,730 INFO L226 Difference]: Without dead ends: 146 [2022-11-26 00:40:08,738 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 365 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 267 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8499 ImplicationChecksByTransitivity, 22.9s TimeCoverageRelationStatistics Valid=25470, Invalid=46622, Unknown=0, NotChecked=0, Total=72092 [2022-11-26 00:40:08,738 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 196 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 385 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 196 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-26 00:40:08,739 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 59 Invalid, 385 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [196 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-26 00:40:08,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2022-11-26 00:40:08,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 146. [2022-11-26 00:40:08,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 142 states have (on average 1.0211267605633803) internal successors, (145), 143 states have internal predecessors, (145), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-26 00:40:08,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 148 transitions. [2022-11-26 00:40:08,756 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 148 transitions. Word has length 77 [2022-11-26 00:40:08,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:40:08,756 INFO L495 AbstractCegarLoop]: Abstraction has 146 states and 148 transitions. [2022-11-26 00:40:08,756 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 199 states, 199 states have (on average 1.035175879396985) internal successors, (206), 198 states have internal predecessors, (206), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:40:08,757 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 148 transitions. [2022-11-26 00:40:08,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2022-11-26 00:40:08,760 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:40:08,760 INFO L195 NwaCegarLoop]: trace histogram [126, 9, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:40:08,772 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-26 00:40:08,972 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-26 00:40:08,972 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:40:08,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:40:08,972 INFO L85 PathProgramCache]: Analyzing trace with hash 489773498, now seen corresponding path program 7 times [2022-11-26 00:40:08,973 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:40:08,973 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [171549948] [2022-11-26 00:40:08,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:40:08,973 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:40:09,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:40:37,283 INFO L134 CoverageAnalysis]: Checked inductivity of 8046 backedges. 0 proven. 8046 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:40:37,283 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:40:37,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [171549948] [2022-11-26 00:40:37,283 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [171549948] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:40:37,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1423411624] [2022-11-26 00:40:37,284 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:40:37,284 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:40:37,284 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:40:37,285 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:40:37,287 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-26 00:40:37,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:40:37,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 128 conjunts are in the unsatisfiable core [2022-11-26 00:40:37,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:40:55,731 INFO L134 CoverageAnalysis]: Checked inductivity of 8046 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-26 00:40:55,731 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:41:31,329 INFO L134 CoverageAnalysis]: Checked inductivity of 8046 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-26 00:41:31,329 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1423411624] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:41:31,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [708726306] [2022-11-26 00:41:31,331 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:41:31,331 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:41:31,332 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:41:31,332 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:41:31,332 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:41:31,486 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2022-11-26 00:41:31,499 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:41:32,769 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4648#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:41:32,770 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:41:32,770 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:41:32,770 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [137, 128, 128] total 391 [2022-11-26 00:41:32,770 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114329800] [2022-11-26 00:41:32,770 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:41:32,771 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 392 states [2022-11-26 00:41:32,771 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:41:32,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 392 interpolants. [2022-11-26 00:41:32,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66248, Invalid=91758, Unknown=0, NotChecked=0, Total=158006 [2022-11-26 00:41:32,801 INFO L87 Difference]: Start difference. First operand 146 states and 148 transitions. Second operand has 392 states, 392 states have (on average 1.0178571428571428) internal successors, (399), 391 states have internal predecessors, (399), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:42:01,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:42:01,393 INFO L93 Difference]: Finished difference Result 293 states and 425 transitions. [2022-11-26 00:42:01,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 266 states. [2022-11-26 00:42:01,394 INFO L78 Accepts]: Start accepts. Automaton has has 392 states, 392 states have (on average 1.0178571428571428) internal successors, (399), 391 states have internal predecessors, (399), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 142 [2022-11-26 00:42:01,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:42:01,396 INFO L225 Difference]: With dead ends: 293 [2022-11-26 00:42:01,396 INFO L226 Difference]: Without dead ends: 275 [2022-11-26 00:42:01,408 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 689 GetRequests, 165 SyntacticMatches, 0 SemanticMatches, 524 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29528 ImplicationChecksByTransitivity, 87.6s TimeCoverageRelationStatistics Valid=100296, Invalid=175854, Unknown=0, NotChecked=0, Total=276150 [2022-11-26 00:42:01,408 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 373 mSolverCounterSat, 646 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 1019 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 646 IncrementalHoareTripleChecker+Valid, 373 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-26 00:42:01,409 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 88 Invalid, 1019 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [646 Valid, 373 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-26 00:42:01,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2022-11-26 00:42:01,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 275. [2022-11-26 00:42:01,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 275 states, 271 states have (on average 1.011070110701107) internal successors, (274), 272 states have internal predecessors, (274), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-26 00:42:01,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 277 transitions. [2022-11-26 00:42:01,433 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 277 transitions. Word has length 142 [2022-11-26 00:42:01,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:42:01,434 INFO L495 AbstractCegarLoop]: Abstraction has 275 states and 277 transitions. [2022-11-26 00:42:01,435 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 392 states, 392 states have (on average 1.0178571428571428) internal successors, (399), 391 states have internal predecessors, (399), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:42:01,435 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 277 transitions. [2022-11-26 00:42:01,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 272 [2022-11-26 00:42:01,440 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:42:01,440 INFO L195 NwaCegarLoop]: trace histogram [254, 10, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:42:01,451 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-11-26 00:42:01,646 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:42:01,647 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:42:01,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:42:01,647 INFO L85 PathProgramCache]: Analyzing trace with hash 1269568014, now seen corresponding path program 8 times [2022-11-26 00:42:01,647 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:42:01,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1613374507] [2022-11-26 00:42:01,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:42:01,648 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:42:02,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:44:23,449 INFO L134 CoverageAnalysis]: Checked inductivity of 32440 backedges. 0 proven. 32440 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:44:23,449 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:44:23,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1613374507] [2022-11-26 00:44:23,450 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1613374507] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:44:23,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1240946400] [2022-11-26 00:44:23,450 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:44:23,450 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:44:23,450 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:44:23,453 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:44:23,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-26 00:44:23,604 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-26 00:44:23,605 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:44:23,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-26 00:44:23,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:44:25,519 INFO L134 CoverageAnalysis]: Checked inductivity of 32440 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 32385 trivial. 0 not checked. [2022-11-26 00:44:25,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:44:26,577 INFO L134 CoverageAnalysis]: Checked inductivity of 32440 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 32410 trivial. 0 not checked. [2022-11-26 00:44:26,577 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1240946400] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:44:26,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1868828202] [2022-11-26 00:44:26,579 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:44:26,579 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:44:26,580 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:44:26,580 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:44:26,580 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:44:26,757 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2022-11-26 00:44:26,769 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:44:28,241 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7933#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:44:28,242 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:44:28,242 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:44:28,242 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [266, 14, 5] total 283 [2022-11-26 00:44:28,242 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376194710] [2022-11-26 00:44:28,243 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:44:28,244 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 284 states [2022-11-26 00:44:28,244 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:44:28,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 284 interpolants. [2022-11-26 00:44:28,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35588, Invalid=48222, Unknown=0, NotChecked=0, Total=83810 [2022-11-26 00:44:28,258 INFO L87 Difference]: Start difference. First operand 275 states and 277 transitions. Second operand has 284 states, 284 states have (on average 1.0352112676056338) internal successors, (294), 281 states have internal predecessors, (294), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:45:07,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:45:07,099 INFO L93 Difference]: Finished difference Result 291 states and 296 transitions. [2022-11-26 00:45:07,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 272 states. [2022-11-26 00:45:07,100 INFO L78 Accepts]: Start accepts. Automaton has has 284 states, 284 states have (on average 1.0352112676056338) internal successors, (294), 281 states have internal predecessors, (294), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 271 [2022-11-26 00:45:07,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:45:07,102 INFO L225 Difference]: With dead ends: 291 [2022-11-26 00:45:07,102 INFO L226 Difference]: Without dead ends: 283 [2022-11-26 00:45:07,116 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1343 GetRequests, 789 SyntacticMatches, 0 SemanticMatches, 554 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41910 ImplicationChecksByTransitivity, 72.9s TimeCoverageRelationStatistics Valid=104285, Invalid=204295, Unknown=0, NotChecked=0, Total=308580 [2022-11-26 00:45:07,117 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 10 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 562 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 568 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 562 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-26 00:45:07,117 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 100 Invalid, 568 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 562 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-26 00:45:07,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2022-11-26 00:45:07,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 282. [2022-11-26 00:45:07,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 282 states, 276 states have (on average 1.0144927536231885) internal successors, (280), 278 states have internal predecessors, (280), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-26 00:45:07,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 285 transitions. [2022-11-26 00:45:07,148 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 285 transitions. Word has length 271 [2022-11-26 00:45:07,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:45:07,150 INFO L495 AbstractCegarLoop]: Abstraction has 282 states and 285 transitions. [2022-11-26 00:45:07,151 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 284 states, 284 states have (on average 1.0352112676056338) internal successors, (294), 281 states have internal predecessors, (294), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:45:07,151 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 285 transitions. [2022-11-26 00:45:07,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 273 [2022-11-26 00:45:07,160 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:45:07,162 INFO L195 NwaCegarLoop]: trace histogram [254, 11, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:45:07,173 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-26 00:45:07,367 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-26 00:45:07,368 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:45:07,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:45:07,368 INFO L85 PathProgramCache]: Analyzing trace with hash -176040902, now seen corresponding path program 9 times [2022-11-26 00:45:07,368 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:45:07,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1029704348] [2022-11-26 00:45:07,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:45:07,369 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:45:07,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:47:27,742 INFO L134 CoverageAnalysis]: Checked inductivity of 32451 backedges. 0 proven. 32451 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:47:27,742 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:47:27,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1029704348] [2022-11-26 00:47:27,742 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1029704348] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:47:27,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1497497270] [2022-11-26 00:47:27,743 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:47:27,743 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:47:27,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:47:27,751 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:47:27,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62483aff-265e-4205-b13c-6c2ea22f8b94/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-26 00:47:28,035 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:47:28,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:47:28,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 627 conjuncts, 256 conjunts are in the unsatisfiable core [2022-11-26 00:47:28,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:48:38,240 INFO L134 CoverageAnalysis]: Checked inductivity of 32451 backedges. 0 proven. 32385 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-26 00:48:38,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:50:58,583 INFO L134 CoverageAnalysis]: Checked inductivity of 32451 backedges. 0 proven. 32385 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-26 00:50:58,583 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1497497270] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:50:58,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1580919565] [2022-11-26 00:50:58,585 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:50:58,586 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:50:58,586 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:50:58,586 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:50:58,586 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:50:58,726 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2022-11-26 00:50:58,736 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:51:01,113 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11998#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:51:01,113 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:51:01,113 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:51:01,114 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [267, 256, 256] total 777 [2022-11-26 00:51:01,114 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840478973] [2022-11-26 00:51:01,114 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:51:01,116 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 778 states [2022-11-26 00:51:01,116 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:51:01,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 778 interpolants. [2022-11-26 00:51:01,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=264031, Invalid=349841, Unknown=0, NotChecked=0, Total=613872 [2022-11-26 00:51:01,195 INFO L87 Difference]: Start difference. First operand 282 states and 285 transitions. Second operand has 778 states, 778 states have (on average 1.0089974293059125) internal successors, (785), 777 states have internal predecessors, (785), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)