./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_compareModified_ground.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_compareModified_ground.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh --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 ec4d4b5cea975144b4de3d9f9eb9b04d1c4b7aa6b7464f360f53530c4a9bd50e --- 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-2329fc7 [2022-12-14 12:11:07,189 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 12:11:07,190 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 12:11:07,209 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 12:11:07,209 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 12:11:07,210 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 12:11:07,211 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 12:11:07,213 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 12:11:07,214 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 12:11:07,215 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 12:11:07,216 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 12:11:07,217 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 12:11:07,217 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 12:11:07,218 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 12:11:07,219 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 12:11:07,221 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 12:11:07,221 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 12:11:07,222 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 12:11:07,224 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 12:11:07,225 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 12:11:07,227 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 12:11:07,228 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 12:11:07,229 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 12:11:07,230 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 12:11:07,233 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 12:11:07,233 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 12:11:07,234 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 12:11:07,235 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 12:11:07,235 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 12:11:07,236 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 12:11:07,236 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 12:11:07,237 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 12:11:07,237 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 12:11:07,238 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 12:11:07,239 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 12:11:07,239 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 12:11:07,240 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 12:11:07,240 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 12:11:07,240 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 12:11:07,241 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 12:11:07,242 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 12:11:07,242 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 12:11:07,264 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 12:11:07,264 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 12:11:07,265 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 12:11:07,265 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 12:11:07,265 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 12:11:07,266 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 12:11:07,266 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 12:11:07,266 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 12:11:07,266 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 12:11:07,266 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 12:11:07,266 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 12:11:07,267 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 12:11:07,267 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 12:11:07,267 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 12:11:07,267 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 12:11:07,267 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 12:11:07,267 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 12:11:07,267 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 12:11:07,268 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 12:11:07,268 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 12:11:07,268 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 12:11:07,268 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 12:11:07,268 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 12:11:07,268 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 12:11:07,269 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 12:11:07,269 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 12:11:07,269 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 12:11:07,269 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 12:11:07,269 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 12:11:07,269 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 12:11:07,270 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 12:11:07,270 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 12:11:07,270 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 12:11:07,270 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 12:11:07,270 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 12:11:07,270 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 12:11:07,270 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 12:11:07,271 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 12:11:07,271 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 12:11:07,271 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 12:11:07,271 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 12:11:07,271 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_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ec4d4b5cea975144b4de3d9f9eb9b04d1c4b7aa6b7464f360f53530c4a9bd50e [2022-12-14 12:11:07,471 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 12:11:07,487 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 12:11:07,490 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 12:11:07,491 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 12:11:07,492 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 12:11:07,493 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/array-examples/standard_compareModified_ground.i [2022-12-14 12:11:10,049 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 12:11:10,201 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 12:11:10,201 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/sv-benchmarks/c/array-examples/standard_compareModified_ground.i [2022-12-14 12:11:10,205 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/data/e455f6f1b/7622c64ea3534dcd8694781a44b5f99e/FLAG59c1be223 [2022-12-14 12:11:10,635 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/data/e455f6f1b/7622c64ea3534dcd8694781a44b5f99e [2022-12-14 12:11:10,640 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 12:11:10,642 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 12:11:10,643 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 12:11:10,644 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 12:11:10,647 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 12:11:10,648 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 12:11:10" (1/1) ... [2022-12-14 12:11:10,649 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@74e9e7f1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:11:10, skipping insertion in model container [2022-12-14 12:11:10,649 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 12:11:10" (1/1) ... [2022-12-14 12:11:10,655 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 12:11:10,668 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 12:11:10,773 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_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/sv-benchmarks/c/array-examples/standard_compareModified_ground.i[824,837] [2022-12-14 12:11:10,787 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 12:11:10,793 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 12:11:10,803 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_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/sv-benchmarks/c/array-examples/standard_compareModified_ground.i[824,837] [2022-12-14 12:11:10,810 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 12:11:10,822 INFO L208 MainTranslator]: Completed translation [2022-12-14 12:11:10,822 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:11:10 WrapperNode [2022-12-14 12:11:10,823 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 12:11:10,823 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 12:11:10,823 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 12:11:10,824 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 12:11:10,829 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:11:10" (1/1) ... [2022-12-14 12:11:10,835 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:11:10" (1/1) ... [2022-12-14 12:11:10,850 INFO L138 Inliner]: procedures = 16, calls = 27, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 86 [2022-12-14 12:11:10,851 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 12:11:10,851 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 12:11:10,852 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 12:11:10,852 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 12:11:10,860 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:11:10" (1/1) ... [2022-12-14 12:11:10,860 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:11:10" (1/1) ... [2022-12-14 12:11:10,862 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:11:10" (1/1) ... [2022-12-14 12:11:10,862 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:11:10" (1/1) ... [2022-12-14 12:11:10,867 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:11:10" (1/1) ... [2022-12-14 12:11:10,871 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:11:10" (1/1) ... [2022-12-14 12:11:10,873 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:11:10" (1/1) ... [2022-12-14 12:11:10,874 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:11:10" (1/1) ... [2022-12-14 12:11:10,876 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 12:11:10,877 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 12:11:10,877 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 12:11:10,877 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 12:11:10,878 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:11:10" (1/1) ... [2022-12-14 12:11:10,884 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 12:11:10,893 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:11:10,904 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 12:11:10,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 12:11:10,931 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 12:11:10,932 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 12:11:10,932 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-12-14 12:11:10,932 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-12-14 12:11:10,932 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 12:11:10,932 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 12:11:10,932 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-12-14 12:11:10,932 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-12-14 12:11:10,932 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-12-14 12:11:10,932 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-12-14 12:11:10,989 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 12:11:10,991 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 12:11:11,114 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 12:11:11,142 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 12:11:11,142 INFO L300 CfgBuilder]: Removed 4 assume(true) statements. [2022-12-14 12:11:11,144 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 12:11:11 BoogieIcfgContainer [2022-12-14 12:11:11,144 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 12:11:11,146 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 12:11:11,146 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 12:11:11,148 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 12:11:11,149 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 12:11:10" (1/3) ... [2022-12-14 12:11:11,149 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@698296eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 12:11:11, skipping insertion in model container [2022-12-14 12:11:11,149 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:11:10" (2/3) ... [2022-12-14 12:11:11,149 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@698296eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 12:11:11, skipping insertion in model container [2022-12-14 12:11:11,150 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 12:11:11" (3/3) ... [2022-12-14 12:11:11,151 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_compareModified_ground.i [2022-12-14 12:11:11,165 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 12:11:11,165 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 12:11:11,200 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 12:11:11,205 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;@65035653, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 12:11:11,205 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 12:11:11,208 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 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) [2022-12-14 12:11:11,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-12-14 12:11:11,214 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:11:11,215 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:11:11,215 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:11:11,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:11:11,220 INFO L85 PathProgramCache]: Analyzing trace with hash 1259005784, now seen corresponding path program 1 times [2022-12-14 12:11:11,227 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:11:11,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1350070395] [2022-12-14 12:11:11,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:11:11,228 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:11:11,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:11:11,380 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:11:11,381 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:11:11,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1350070395] [2022-12-14 12:11:11,381 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1350070395] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:11:11,381 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 12:11:11,382 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 12:11:11,383 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990319645] [2022-12-14 12:11:11,383 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:11:11,387 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 12:11:11,387 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:11:11,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 12:11:11,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 12:11:11,411 INFO L87 Difference]: Start difference. First operand has 18 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 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 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 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) [2022-12-14 12:11:11,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:11:11,448 INFO L93 Difference]: Finished difference Result 35 states and 49 transitions. [2022-12-14 12:11:11,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 12:11:11,450 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 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 [2022-12-14 12:11:11,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:11:11,455 INFO L225 Difference]: With dead ends: 35 [2022-12-14 12:11:11,456 INFO L226 Difference]: Without dead ends: 18 [2022-12-14 12:11:11,458 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 [2022-12-14 12:11:11,460 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:11:11,461 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:11:11,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-12-14 12:11:11,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-12-14 12:11:11,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 14 states have internal predecessors, (19), 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) [2022-12-14 12:11:11,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 23 transitions. [2022-12-14 12:11:11,497 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 23 transitions. Word has length 9 [2022-12-14 12:11:11,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:11:11,497 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 23 transitions. [2022-12-14 12:11:11,498 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 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) [2022-12-14 12:11:11,498 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 23 transitions. [2022-12-14 12:11:11,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-12-14 12:11:11,499 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:11:11,499 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:11:11,500 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 12:11:11,500 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:11:11,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:11:11,501 INFO L85 PathProgramCache]: Analyzing trace with hash 173622107, now seen corresponding path program 1 times [2022-12-14 12:11:11,501 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:11:11,501 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2136809037] [2022-12-14 12:11:11,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:11:11,502 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:11:11,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:11:11,611 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:11:11,611 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:11:11,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2136809037] [2022-12-14 12:11:11,612 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2136809037] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:11:11,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2001301108] [2022-12-14 12:11:11,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:11:11,612 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:11:11,613 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:11:11,614 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:11:11,615 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 12:11:11,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:11:11,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 2 conjunts are in the unsatisfiable core [2022-12-14 12:11:11,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:11:11,701 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 12:11:11,701 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 12:11:11,702 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2001301108] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:11:11,702 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 12:11:11,702 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3] total 4 [2022-12-14 12:11:11,703 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460658919] [2022-12-14 12:11:11,703 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:11:11,704 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 12:11:11,704 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:11:11,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 12:11:11,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-12-14 12:11:11,705 INFO L87 Difference]: Start difference. First operand 18 states and 23 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 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) [2022-12-14 12:11:11,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:11:11,726 INFO L93 Difference]: Finished difference Result 33 states and 42 transitions. [2022-12-14 12:11:11,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 12:11:11,727 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 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 10 [2022-12-14 12:11:11,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:11:11,728 INFO L225 Difference]: With dead ends: 33 [2022-12-14 12:11:11,728 INFO L226 Difference]: Without dead ends: 19 [2022-12-14 12:11:11,728 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-12-14 12:11:11,729 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:11:11,730 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:11:11,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-12-14 12:11:11,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-12-14 12:11:11,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 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) [2022-12-14 12:11:11,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 24 transitions. [2022-12-14 12:11:11,735 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 24 transitions. Word has length 10 [2022-12-14 12:11:11,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:11:11,735 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 24 transitions. [2022-12-14 12:11:11,735 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 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) [2022-12-14 12:11:11,736 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 24 transitions. [2022-12-14 12:11:11,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-12-14 12:11:11,736 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:11:11,736 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:11:11,742 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 12:11:11,937 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:11:11,939 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:11:11,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:11:11,941 INFO L85 PathProgramCache]: Analyzing trace with hash 56435170, now seen corresponding path program 1 times [2022-12-14 12:11:11,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:11:11,942 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1656566816] [2022-12-14 12:11:11,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:11:11,942 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:11:11,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:11:12,106 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 12:11:12,106 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:11:12,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1656566816] [2022-12-14 12:11:12,106 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1656566816] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:11:12,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1895852829] [2022-12-14 12:11:12,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:11:12,107 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:11:12,107 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:11:12,108 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:11:12,109 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 12:11:12,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:11:12,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2022-12-14 12:11:12,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:11:12,184 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 12:11:12,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:11:12,201 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 12:11:12,202 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1895852829] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:11:12,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1383844] [2022-12-14 12:11:12,220 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:11:12,220 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:11:12,224 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:11:12,227 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:11:12,228 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:11:12,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:12,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:12,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:12,362 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-12-14 12:11:12,363 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-12-14 12:11:12,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:12,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:12,387 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:12,389 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 13 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2022-12-14 12:11:12,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:12,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:12,451 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-12-14 12:11:12,601 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:12,602 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:12,606 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:12,607 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:12,608 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:12,666 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-12-14 12:11:12,666 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 360 treesize of output 350 [2022-12-14 12:11:12,998 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:13,008 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-12-14 12:11:13,008 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2022-12-14 12:11:13,051 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-12-14 12:11:13,052 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 50 [2022-12-14 12:11:13,091 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:13,092 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:13,118 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-12-14 12:11:13,118 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-12-14 12:11:13,203 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:13,203 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:13,226 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-12-14 12:11:13,227 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-12-14 12:11:13,255 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-12-14 12:11:13,269 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:11:13,478 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '273#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_1| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_1|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1|) (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_1|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:11:13,479 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:11:13,479 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:11:13,479 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2022-12-14 12:11:13,479 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159073519] [2022-12-14 12:11:13,479 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:11:13,480 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-12-14 12:11:13,480 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:11:13,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-12-14 12:11:13,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2022-12-14 12:11:13,481 INFO L87 Difference]: Start difference. First operand 19 states and 24 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 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) [2022-12-14 12:11:13,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:11:13,511 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2022-12-14 12:11:13,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 12:11:13,512 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 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 11 [2022-12-14 12:11:13,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:11:13,513 INFO L225 Difference]: With dead ends: 38 [2022-12-14 12:11:13,513 INFO L226 Difference]: Without dead ends: 22 [2022-12-14 12:11:13,513 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2022-12-14 12:11:13,514 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:11:13,515 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 42 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:11:13,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-12-14 12:11:13,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-12-14 12:11:13,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 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) [2022-12-14 12:11:13,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2022-12-14 12:11:13,523 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 11 [2022-12-14 12:11:13,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:11:13,524 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2022-12-14 12:11:13,524 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 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) [2022-12-14 12:11:13,524 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2022-12-14 12:11:13,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 12:11:13,525 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:11:13,525 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:11:13,529 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 12:11:13,725 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:11:13,725 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:11:13,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:11:13,726 INFO L85 PathProgramCache]: Analyzing trace with hash 557100229, now seen corresponding path program 2 times [2022-12-14 12:11:13,726 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:11:13,727 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1092703221] [2022-12-14 12:11:13,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:11:13,727 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:11:13,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:11:13,815 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 12:11:13,815 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:11:13,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1092703221] [2022-12-14 12:11:13,815 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1092703221] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:11:13,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1957337584] [2022-12-14 12:11:13,816 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:11:13,816 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:11:13,816 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:11:13,817 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:11:13,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 12:11:13,870 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 12:11:13,870 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:11:13,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 3 conjunts are in the unsatisfiable core [2022-12-14 12:11:13,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:11:13,882 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 12:11:13,883 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:11:13,896 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 12:11:13,896 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1957337584] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:11:13,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [612059743] [2022-12-14 12:11:13,898 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:11:13,898 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:11:13,898 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:11:13,899 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:11:13,899 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:11:13,913 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:13,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:13,916 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:13,962 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-12-14 12:11:13,963 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-12-14 12:11:13,975 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:13,976 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:13,977 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:13,978 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 13 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2022-12-14 12:11:14,003 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:14,004 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:14,006 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-12-14 12:11:14,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:14,079 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:14,082 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:14,082 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:14,083 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:14,141 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-12-14 12:11:14,141 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 360 treesize of output 350 [2022-12-14 12:11:14,488 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:14,499 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-12-14 12:11:14,500 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2022-12-14 12:11:14,543 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-12-14 12:11:14,543 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 50 [2022-12-14 12:11:14,579 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:14,580 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:14,604 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-12-14 12:11:14,605 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-12-14 12:11:14,637 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-12-14 12:11:14,649 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:11:14,867 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '457#(and (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_2| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_2| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_2|) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_2|) (= (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_2|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_2|) 0)) 1 0) |__VERIFIER_assert_#in~cond|))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:11:14,867 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:11:14,867 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:11:14,868 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2022-12-14 12:11:14,868 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628900296] [2022-12-14 12:11:14,868 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:11:14,868 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-12-14 12:11:14,868 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:11:14,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-12-14 12:11:14,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2022-12-14 12:11:14,869 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 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) [2022-12-14 12:11:14,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:11:14,888 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2022-12-14 12:11:14,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 12:11:14,888 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 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 14 [2022-12-14 12:11:14,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:11:14,889 INFO L225 Difference]: With dead ends: 39 [2022-12-14 12:11:14,889 INFO L226 Difference]: Without dead ends: 25 [2022-12-14 12:11:14,889 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2022-12-14 12:11:14,890 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:11:14,890 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:11:14,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-12-14 12:11:14,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-12-14 12:11:14,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 21 states have internal predecessors, (26), 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) [2022-12-14 12:11:14,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2022-12-14 12:11:14,893 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 14 [2022-12-14 12:11:14,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:11:14,893 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2022-12-14 12:11:14,893 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 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) [2022-12-14 12:11:14,893 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2022-12-14 12:11:14,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-12-14 12:11:14,894 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:11:14,894 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:11:14,899 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 12:11:15,095 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:11:15,096 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:11:15,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:11:15,096 INFO L85 PathProgramCache]: Analyzing trace with hash -645164200, now seen corresponding path program 3 times [2022-12-14 12:11:15,097 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:11:15,097 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [386602334] [2022-12-14 12:11:15,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:11:15,097 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:11:15,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:11:15,298 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 12:11:15,298 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:11:15,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [386602334] [2022-12-14 12:11:15,299 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [386602334] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:11:15,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2016551579] [2022-12-14 12:11:15,299 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:11:15,299 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:11:15,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:11:15,300 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:11:15,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 12:11:15,361 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:11:15,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:11:15,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 6 conjunts are in the unsatisfiable core [2022-12-14 12:11:15,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:11:15,374 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 12:11:15,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:11:15,412 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 12:11:15,412 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2016551579] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:11:15,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [508577777] [2022-12-14 12:11:15,415 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:11:15,415 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:11:15,415 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:11:15,415 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:11:15,415 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:11:15,431 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:15,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:15,435 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:15,483 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-12-14 12:11:15,483 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-12-14 12:11:15,495 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:15,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:15,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:15,498 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 13 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2022-12-14 12:11:15,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:15,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:15,524 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-12-14 12:11:15,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:15,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:15,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:15,595 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:15,596 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:15,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:15,599 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:15,627 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-12-14 12:11:15,628 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 380 treesize of output 348 [2022-12-14 12:11:15,689 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:15,698 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-12-14 12:11:15,699 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2022-12-14 12:11:15,738 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-12-14 12:11:15,738 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 50 [2022-12-14 12:11:15,769 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:15,769 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:15,790 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-12-14 12:11:15,790 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-12-14 12:11:15,822 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-12-14 12:11:15,830 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:11:16,035 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '673#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_3| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_3| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_3|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_3|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_3|) (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_3|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:11:16,035 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:11:16,035 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:11:16,035 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2022-12-14 12:11:16,036 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517310509] [2022-12-14 12:11:16,036 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:11:16,036 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-14 12:11:16,036 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:11:16,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-14 12:11:16,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=317, Unknown=0, NotChecked=0, Total=420 [2022-12-14 12:11:16,037 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 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) [2022-12-14 12:11:16,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:11:16,067 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2022-12-14 12:11:16,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 12:11:16,068 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 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 17 [2022-12-14 12:11:16,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:11:16,068 INFO L225 Difference]: With dead ends: 50 [2022-12-14 12:11:16,068 INFO L226 Difference]: Without dead ends: 31 [2022-12-14 12:11:16,069 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=103, Invalid=317, Unknown=0, NotChecked=0, Total=420 [2022-12-14 12:11:16,069 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:11:16,070 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 70 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:11:16,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-12-14 12:11:16,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-12-14 12:11:16,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 27 states have internal predecessors, (32), 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) [2022-12-14 12:11:16,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2022-12-14 12:11:16,074 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 17 [2022-12-14 12:11:16,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:11:16,075 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2022-12-14 12:11:16,075 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 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) [2022-12-14 12:11:16,075 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2022-12-14 12:11:16,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-12-14 12:11:16,075 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:11:16,075 INFO L195 NwaCegarLoop]: trace histogram [10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:11:16,081 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 12:11:16,276 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:11:16,277 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:11:16,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:11:16,278 INFO L85 PathProgramCache]: Analyzing trace with hash -1235407752, now seen corresponding path program 4 times [2022-12-14 12:11:16,278 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:11:16,279 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1291170828] [2022-12-14 12:11:16,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:11:16,279 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:11:16,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:11:16,578 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 12:11:16,578 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:11:16,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1291170828] [2022-12-14 12:11:16,578 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1291170828] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:11:16,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [96886109] [2022-12-14 12:11:16,578 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 12:11:16,579 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:11:16,579 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:11:16,579 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:11:16,580 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 12:11:16,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:11:16,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 12:11:16,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:11:16,677 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 12:11:16,677 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:11:16,790 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 12:11:16,791 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [96886109] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:11:16,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [831600775] [2022-12-14 12:11:16,792 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:11:16,793 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:11:16,793 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:11:16,793 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:11:16,793 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:11:16,805 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:16,805 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:16,806 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:16,837 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-12-14 12:11:16,838 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-12-14 12:11:16,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:16,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:16,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:16,896 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-12-14 12:11:16,896 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-12-14 12:11:16,929 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:16,930 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:16,931 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-12-14 12:11:17,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:17,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:17,020 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:17,020 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:17,021 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:17,064 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-12-14 12:11:17,065 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 360 treesize of output 350 [2022-12-14 12:11:17,307 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:17,317 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-12-14 12:11:17,317 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2022-12-14 12:11:17,359 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-12-14 12:11:17,359 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 50 [2022-12-14 12:11:17,391 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:17,391 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:17,408 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-12-14 12:11:17,409 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-12-14 12:11:17,436 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-12-14 12:11:17,446 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:11:17,673 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '971#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_4| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_4| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_4|) (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_4|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_4|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_4|))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:11:17,673 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:11:17,673 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:11:17,673 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2022-12-14 12:11:17,673 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256362498] [2022-12-14 12:11:17,673 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:11:17,673 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 12:11:17,673 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:11:17,674 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 12:11:17,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=731, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 12:11:17,674 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 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) [2022-12-14 12:11:17,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:11:17,703 INFO L93 Difference]: Finished difference Result 62 states and 83 transitions. [2022-12-14 12:11:17,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-12-14 12:11:17,704 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 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 23 [2022-12-14 12:11:17,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:11:17,704 INFO L225 Difference]: With dead ends: 62 [2022-12-14 12:11:17,704 INFO L226 Difference]: Without dead ends: 43 [2022-12-14 12:11:17,705 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=325, Invalid=731, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 12:11:17,705 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:11:17,705 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 56 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:11:17,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-12-14 12:11:17,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2022-12-14 12:11:17,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 39 states have internal predecessors, (44), 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) [2022-12-14 12:11:17,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 48 transitions. [2022-12-14 12:11:17,709 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 48 transitions. Word has length 23 [2022-12-14 12:11:17,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:11:17,709 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 48 transitions. [2022-12-14 12:11:17,709 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 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) [2022-12-14 12:11:17,709 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 48 transitions. [2022-12-14 12:11:17,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-12-14 12:11:17,710 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:11:17,710 INFO L195 NwaCegarLoop]: trace histogram [22, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:11:17,715 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 12:11:17,911 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:11:17,912 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:11:17,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:11:17,913 INFO L85 PathProgramCache]: Analyzing trace with hash 1932809912, now seen corresponding path program 5 times [2022-12-14 12:11:17,913 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:11:17,914 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [989324754] [2022-12-14 12:11:17,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:11:17,914 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:11:17,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:11:18,396 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 12:11:18,396 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:11:18,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [989324754] [2022-12-14 12:11:18,396 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [989324754] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:11:18,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1694135464] [2022-12-14 12:11:18,397 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:11:18,397 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:11:18,397 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:11:18,397 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:11:18,400 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 12:11:18,485 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 12:11:18,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:11:18,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 6 conjunts are in the unsatisfiable core [2022-12-14 12:11:18,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:11:18,560 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-12-14 12:11:18,560 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:11:18,639 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-12-14 12:11:18,639 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1694135464] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:11:18,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1509287027] [2022-12-14 12:11:18,641 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:11:18,641 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:11:18,641 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:11:18,641 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:11:18,642 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:11:18,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:18,658 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:18,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:18,698 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-12-14 12:11:18,698 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-12-14 12:11:18,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:18,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:18,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:18,711 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 13 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2022-12-14 12:11:18,736 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:18,737 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:18,738 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-12-14 12:11:18,826 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:18,827 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:18,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:18,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:18,830 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:18,833 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:18,833 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:18,857 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-12-14 12:11:18,858 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 380 treesize of output 348 [2022-12-14 12:11:18,921 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:18,929 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-12-14 12:11:18,929 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2022-12-14 12:11:18,948 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:18,948 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:18,965 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-12-14 12:11:18,965 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-12-14 12:11:18,993 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:18,994 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:19,012 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-12-14 12:11:19,012 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-12-14 12:11:19,044 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-12-14 12:11:19,055 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:11:19,387 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1399#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_5| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_5| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_5|) (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_5|) (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_5|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_5|) 0)) 1 0)))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:11:19,388 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:11:19,388 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:11:19,388 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 6, 6] total 34 [2022-12-14 12:11:19,388 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [816628169] [2022-12-14 12:11:19,388 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:11:19,388 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-12-14 12:11:19,388 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:11:19,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-12-14 12:11:19,389 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=400, Invalid=1406, Unknown=0, NotChecked=0, Total=1806 [2022-12-14 12:11:19,389 INFO L87 Difference]: Start difference. First operand 43 states and 48 transitions. Second operand has 35 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 34 states have internal predecessors, (47), 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) [2022-12-14 12:11:19,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:11:19,724 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2022-12-14 12:11:19,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-12-14 12:11:19,724 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 34 states have internal predecessors, (47), 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 35 [2022-12-14 12:11:19,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:11:19,725 INFO L225 Difference]: With dead ends: 69 [2022-12-14 12:11:19,725 INFO L226 Difference]: Without dead ends: 50 [2022-12-14 12:11:19,726 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 862 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1205, Invalid=3085, Unknown=0, NotChecked=0, Total=4290 [2022-12-14 12:11:19,726 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:11:19,726 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 126 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:11:19,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-12-14 12:11:19,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-12-14 12:11:19,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 46 states have (on average 1.108695652173913) internal successors, (51), 46 states have internal predecessors, (51), 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) [2022-12-14 12:11:19,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2022-12-14 12:11:19,730 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 35 [2022-12-14 12:11:19,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:11:19,731 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2022-12-14 12:11:19,731 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 34 states have internal predecessors, (47), 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) [2022-12-14 12:11:19,731 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2022-12-14 12:11:19,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-12-14 12:11:19,731 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:11:19,731 INFO L195 NwaCegarLoop]: trace histogram [23, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:11:19,736 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 12:11:19,932 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:11:19,933 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:11:19,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:11:19,934 INFO L85 PathProgramCache]: Analyzing trace with hash 1964144539, now seen corresponding path program 6 times [2022-12-14 12:11:19,935 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:11:19,935 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1585450110] [2022-12-14 12:11:19,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:11:19,936 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:11:20,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:11:20,456 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 12:11:20,456 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:11:20,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1585450110] [2022-12-14 12:11:20,456 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1585450110] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:11:20,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2065734661] [2022-12-14 12:11:20,456 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:11:20,456 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:11:20,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:11:20,457 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:11:20,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 12:11:20,575 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:11:20,575 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:11:20,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 555 conjuncts, 25 conjunts are in the unsatisfiable core [2022-12-14 12:11:20,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:11:20,613 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 12:11:20,614 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:11:21,070 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 12:11:21,070 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2065734661] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:11:21,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [736310576] [2022-12-14 12:11:21,072 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:11:21,072 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:11:21,072 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:11:21,072 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:11:21,073 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:11:21,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:21,084 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:21,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:21,115 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-12-14 12:11:21,116 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-12-14 12:11:21,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:21,128 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:21,129 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:21,167 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-12-14 12:11:21,167 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-12-14 12:11:21,191 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:21,192 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:21,193 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-12-14 12:11:21,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:21,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:21,259 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:21,259 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:21,260 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:21,306 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-12-14 12:11:21,307 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 360 treesize of output 350 [2022-12-14 12:11:21,550 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:21,557 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-12-14 12:11:21,557 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2022-12-14 12:11:21,589 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-12-14 12:11:21,589 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 50 [2022-12-14 12:11:21,617 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:21,617 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:21,635 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-12-14 12:11:21,636 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-12-14 12:11:21,663 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-12-14 12:11:21,671 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:11:21,936 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1959#(and (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_6| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_6| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_6|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_6|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_6|) (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_6|))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:11:21,936 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:11:21,936 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:11:21,936 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 50 [2022-12-14 12:11:21,937 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1984515335] [2022-12-14 12:11:21,937 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:11:21,937 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-12-14 12:11:21,937 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:11:21,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-12-14 12:11:21,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1300, Invalid=2122, Unknown=0, NotChecked=0, Total=3422 [2022-12-14 12:11:21,941 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand has 51 states, 51 states have (on average 1.1568627450980393) internal successors, (59), 50 states have internal predecessors, (59), 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) [2022-12-14 12:11:22,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:11:22,009 INFO L93 Difference]: Finished difference Result 100 states and 134 transitions. [2022-12-14 12:11:22,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-12-14 12:11:22,009 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.1568627450980393) internal successors, (59), 50 states have internal predecessors, (59), 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 42 [2022-12-14 12:11:22,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:11:22,010 INFO L225 Difference]: With dead ends: 100 [2022-12-14 12:11:22,010 INFO L226 Difference]: Without dead ends: 75 [2022-12-14 12:11:22,011 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 674 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1300, Invalid=2122, Unknown=0, NotChecked=0, Total=3422 [2022-12-14 12:11:22,011 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:11:22,012 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 70 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:11:22,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-12-14 12:11:22,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2022-12-14 12:11:22,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 71 states have (on average 1.0704225352112675) internal successors, (76), 71 states have internal predecessors, (76), 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) [2022-12-14 12:11:22,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 80 transitions. [2022-12-14 12:11:22,020 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 80 transitions. Word has length 42 [2022-12-14 12:11:22,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:11:22,020 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 80 transitions. [2022-12-14 12:11:22,020 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.1568627450980393) internal successors, (59), 50 states have internal predecessors, (59), 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) [2022-12-14 12:11:22,020 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 80 transitions. [2022-12-14 12:11:22,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-12-14 12:11:22,021 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:11:22,021 INFO L195 NwaCegarLoop]: trace histogram [48, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:11:22,027 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 12:11:22,222 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-12-14 12:11:22,223 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:11:22,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:11:22,223 INFO L85 PathProgramCache]: Analyzing trace with hash 517512312, now seen corresponding path program 7 times [2022-12-14 12:11:22,223 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:11:22,223 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [546360067] [2022-12-14 12:11:22,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:11:22,223 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:11:22,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:11:23,703 INFO L134 CoverageAnalysis]: Checked inductivity of 1231 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 12:11:23,703 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:11:23,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [546360067] [2022-12-14 12:11:23,704 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [546360067] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:11:23,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [405832006] [2022-12-14 12:11:23,704 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 12:11:23,704 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:11:23,704 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:11:23,705 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:11:23,705 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 12:11:23,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:11:23,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 980 conjuncts, 50 conjunts are in the unsatisfiable core [2022-12-14 12:11:23,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:11:23,986 INFO L134 CoverageAnalysis]: Checked inductivity of 1231 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 12:11:23,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:11:25,624 INFO L134 CoverageAnalysis]: Checked inductivity of 1231 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 12:11:25,624 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [405832006] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:11:25,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1007187289] [2022-12-14 12:11:25,626 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:11:25,626 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:11:25,627 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:11:25,627 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:11:25,627 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:11:25,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:25,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:25,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:25,670 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-12-14 12:11:25,670 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-12-14 12:11:25,682 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:25,683 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:25,684 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:25,720 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-12-14 12:11:25,720 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-12-14 12:11:25,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:25,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:25,745 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-12-14 12:11:25,805 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:25,806 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:25,808 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:25,809 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:25,809 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:25,848 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-12-14 12:11:25,848 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 360 treesize of output 350 [2022-12-14 12:11:26,096 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:26,102 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-12-14 12:11:26,102 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2022-12-14 12:11:26,117 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:26,117 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:26,133 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-12-14 12:11:26,133 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-12-14 12:11:26,157 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:26,158 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:26,174 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-12-14 12:11:26,175 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-12-14 12:11:26,212 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-12-14 12:11:26,221 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:11:26,616 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2785#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_7| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_7| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_7|) (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_7|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_7|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_7|))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:11:26,616 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:11:26,616 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:11:26,616 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 100 [2022-12-14 12:11:26,616 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047809934] [2022-12-14 12:11:26,616 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:11:26,617 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2022-12-14 12:11:26,617 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:11:26,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2022-12-14 12:11:26,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5075, Invalid=6697, Unknown=0, NotChecked=0, Total=11772 [2022-12-14 12:11:26,625 INFO L87 Difference]: Start difference. First operand 75 states and 80 transitions. Second operand has 101 states, 101 states have (on average 1.0792079207920793) internal successors, (109), 100 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) [2022-12-14 12:11:26,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:11:26,772 INFO L93 Difference]: Finished difference Result 150 states and 209 transitions. [2022-12-14 12:11:26,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2022-12-14 12:11:26,773 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 1.0792079207920793) internal successors, (109), 100 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 67 [2022-12-14 12:11:26,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:11:26,774 INFO L225 Difference]: With dead ends: 150 [2022-12-14 12:11:26,774 INFO L226 Difference]: Without dead ends: 125 [2022-12-14 12:11:26,776 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1374 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=5075, Invalid=6697, Unknown=0, NotChecked=0, Total=11772 [2022-12-14 12:11:26,776 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:11:26,776 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 98 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:11:26,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2022-12-14 12:11:26,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2022-12-14 12:11:26,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 121 states have (on average 1.0413223140495869) internal successors, (126), 121 states have internal predecessors, (126), 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) [2022-12-14 12:11:26,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 130 transitions. [2022-12-14 12:11:26,784 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 130 transitions. Word has length 67 [2022-12-14 12:11:26,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:11:26,784 INFO L495 AbstractCegarLoop]: Abstraction has 125 states and 130 transitions. [2022-12-14 12:11:26,784 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 1.0792079207920793) internal successors, (109), 100 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) [2022-12-14 12:11:26,784 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 130 transitions. [2022-12-14 12:11:26,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2022-12-14 12:11:26,785 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:11:26,785 INFO L195 NwaCegarLoop]: trace histogram [98, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:11:26,791 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-12-14 12:11:26,986 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:11:26,987 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:11:26,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:11:26,988 INFO L85 PathProgramCache]: Analyzing trace with hash 1403882968, now seen corresponding path program 8 times [2022-12-14 12:11:26,988 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:11:26,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [167115241] [2022-12-14 12:11:26,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:11:26,989 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:11:27,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:11:32,233 INFO L134 CoverageAnalysis]: Checked inductivity of 4906 backedges. 0 proven. 4851 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 12:11:32,233 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:11:32,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [167115241] [2022-12-14 12:11:32,233 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [167115241] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:11:32,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1278343851] [2022-12-14 12:11:32,234 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:11:32,234 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:11:32,234 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:11:32,234 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:11:32,235 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 12:11:33,112 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-12-14 12:11:33,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:11:33,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 12:11:33,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:11:33,570 INFO L134 CoverageAnalysis]: Checked inductivity of 4906 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2022-12-14 12:11:33,570 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:11:34,051 INFO L134 CoverageAnalysis]: Checked inductivity of 4906 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2022-12-14 12:11:34,051 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1278343851] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:11:34,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1461928235] [2022-12-14 12:11:34,052 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:11:34,052 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:11:34,052 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:11:34,052 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:11:34,052 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:11:34,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:34,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:34,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:34,096 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-12-14 12:11:34,097 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-12-14 12:11:34,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:34,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:34,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:34,148 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-12-14 12:11:34,149 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-12-14 12:11:34,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:34,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:34,171 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-12-14 12:11:34,227 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:34,227 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:34,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:34,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:34,229 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:34,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:34,232 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:34,255 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-12-14 12:11:34,256 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 380 treesize of output 348 [2022-12-14 12:11:34,303 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:34,311 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-12-14 12:11:34,311 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2022-12-14 12:11:34,325 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:34,326 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:34,347 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-12-14 12:11:34,347 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-12-14 12:11:34,378 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:34,378 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:34,400 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-12-14 12:11:34,400 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-12-14 12:11:34,449 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:34,449 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:34,468 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-12-14 12:11:34,469 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-12-14 12:11:34,487 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-12-14 12:11:34,495 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:11:35,078 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4133#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_8| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_8| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_8|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_8|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_8|) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_8|))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:11:35,079 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:11:35,079 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:11:35,079 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 12, 12] total 122 [2022-12-14 12:11:35,079 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649086971] [2022-12-14 12:11:35,079 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:11:35,079 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2022-12-14 12:11:35,079 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:11:35,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2022-12-14 12:11:35,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5372, Invalid=11658, Unknown=0, NotChecked=0, Total=17030 [2022-12-14 12:11:35,083 INFO L87 Difference]: Start difference. First operand 125 states and 130 transitions. Second operand has 123 states, 123 states have (on average 1.0975609756097562) internal successors, (135), 122 states have internal predecessors, (135), 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) [2022-12-14 12:11:38,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:11:38,725 INFO L93 Difference]: Finished difference Result 163 states and 185 transitions. [2022-12-14 12:11:38,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2022-12-14 12:11:38,726 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 1.0975609756097562) internal successors, (135), 122 states have internal predecessors, (135), 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 117 [2022-12-14 12:11:38,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:11:38,727 INFO L225 Difference]: With dead ends: 163 [2022-12-14 12:11:38,727 INFO L226 Difference]: Without dead ends: 138 [2022-12-14 12:11:38,733 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 548 GetRequests, 320 SyntacticMatches, 0 SemanticMatches, 228 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8458 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=17549, Invalid=35121, Unknown=0, NotChecked=0, Total=52670 [2022-12-14 12:11:38,734 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 195 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 182 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 12:11:38,734 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 182 Invalid, 196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 195 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 12:11:38,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2022-12-14 12:11:38,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 138. [2022-12-14 12:11:38,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 134 states have (on average 1.037313432835821) internal successors, (139), 134 states have internal predecessors, (139), 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) [2022-12-14 12:11:38,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 143 transitions. [2022-12-14 12:11:38,748 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 143 transitions. Word has length 117 [2022-12-14 12:11:38,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:11:38,748 INFO L495 AbstractCegarLoop]: Abstraction has 138 states and 143 transitions. [2022-12-14 12:11:38,749 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 1.0975609756097562) internal successors, (135), 122 states have internal predecessors, (135), 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) [2022-12-14 12:11:38,749 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 143 transitions. [2022-12-14 12:11:38,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2022-12-14 12:11:38,750 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:11:38,750 INFO L195 NwaCegarLoop]: trace histogram [99, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:11:38,756 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 12:11:38,951 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-12-14 12:11:38,952 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:11:38,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:11:38,954 INFO L85 PathProgramCache]: Analyzing trace with hash -67520869, now seen corresponding path program 9 times [2022-12-14 12:11:38,954 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:11:38,954 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1391804812] [2022-12-14 12:11:38,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:11:38,955 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:11:39,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:11:43,763 INFO L134 CoverageAnalysis]: Checked inductivity of 5203 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-12-14 12:11:43,763 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:11:43,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1391804812] [2022-12-14 12:11:43,764 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1391804812] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:11:43,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [662915974] [2022-12-14 12:11:43,764 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:11:43,764 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:11:43,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:11:43,765 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:11:43,765 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 12:11:44,154 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:11:44,154 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:11:44,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 1943 conjuncts, 101 conjunts are in the unsatisfiable core [2022-12-14 12:11:44,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:11:44,265 INFO L134 CoverageAnalysis]: Checked inductivity of 5203 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-12-14 12:11:44,265 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:11:51,341 INFO L134 CoverageAnalysis]: Checked inductivity of 5203 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-12-14 12:11:51,342 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [662915974] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:11:51,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [680235063] [2022-12-14 12:11:51,343 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:11:51,343 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:11:51,343 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:11:51,343 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:11:51,343 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:11:51,351 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:51,352 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:51,353 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:51,386 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-12-14 12:11:51,387 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-12-14 12:11:51,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:51,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:51,400 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:51,439 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-12-14 12:11:51,439 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-12-14 12:11:51,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:51,463 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:51,464 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-12-14 12:11:51,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:51,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:51,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:51,524 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:51,525 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:51,528 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:51,529 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:11:51,548 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-12-14 12:11:51,548 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 380 treesize of output 348 [2022-12-14 12:11:51,597 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:51,604 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-12-14 12:11:51,604 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2022-12-14 12:11:51,617 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:51,618 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:51,635 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-12-14 12:11:51,635 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-12-14 12:11:51,665 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:51,665 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:51,684 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-12-14 12:11:51,685 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-12-14 12:11:51,757 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:51,758 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:11:51,778 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-12-14 12:11:51,779 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-12-14 12:11:51,797 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-12-14 12:11:51,806 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:11:52,435 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5889#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_9| Int) (|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_9| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_9|) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_9|) (= (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_9|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_9|) 0)) 1 0) |__VERIFIER_assert_#in~cond|))) (= |#NULL.base| 0))' at error location [2022-12-14 12:11:52,435 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:11:52,435 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:11:52,436 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101, 101] total 202 [2022-12-14 12:11:52,436 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981727017] [2022-12-14 12:11:52,436 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:11:52,437 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 203 states [2022-12-14 12:11:52,437 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:11:52,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 203 interpolants. [2022-12-14 12:11:52,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20528, Invalid=23782, Unknown=0, NotChecked=0, Total=44310 [2022-12-14 12:11:52,448 INFO L87 Difference]: Start difference. First operand 138 states and 143 transitions. Second operand has 203 states, 203 states have (on average 1.0394088669950738) internal successors, (211), 202 states have internal predecessors, (211), 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) [2022-12-14 12:11:52,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:11:52,806 INFO L93 Difference]: Finished difference Result 276 states and 386 transitions. [2022-12-14 12:11:52,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 202 states. [2022-12-14 12:11:52,807 INFO L78 Accepts]: Start accepts. Automaton has has 203 states, 203 states have (on average 1.0394088669950738) internal successors, (211), 202 states have internal predecessors, (211), 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 130 [2022-12-14 12:11:52,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:11:52,808 INFO L225 Difference]: With dead ends: 276 [2022-12-14 12:11:52,809 INFO L226 Difference]: Without dead ends: 239 [2022-12-14 12:11:52,811 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 280 SyntacticMatches, 0 SemanticMatches, 209 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2802 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=20528, Invalid=23782, Unknown=0, NotChecked=0, Total=44310 [2022-12-14 12:11:52,811 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:11:52,812 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 126 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 257 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:11:52,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2022-12-14 12:11:52,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 239. [2022-12-14 12:11:52,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 235 states have (on average 1.0212765957446808) internal successors, (240), 235 states have internal predecessors, (240), 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) [2022-12-14 12:11:52,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 244 transitions. [2022-12-14 12:11:52,823 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 244 transitions. Word has length 130 [2022-12-14 12:11:52,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:11:52,823 INFO L495 AbstractCegarLoop]: Abstraction has 239 states and 244 transitions. [2022-12-14 12:11:52,824 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 203 states, 203 states have (on average 1.0394088669950738) internal successors, (211), 202 states have internal predecessors, (211), 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) [2022-12-14 12:11:52,824 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 244 transitions. [2022-12-14 12:11:52,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2022-12-14 12:11:52,825 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:11:52,826 INFO L195 NwaCegarLoop]: trace histogram [200, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:11:52,833 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-12-14 12:11:53,026 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:11:53,027 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:11:53,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:11:53,028 INFO L85 PathProgramCache]: Analyzing trace with hash -1771470152, now seen corresponding path program 10 times [2022-12-14 12:11:53,029 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:11:53,029 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [156314534] [2022-12-14 12:11:53,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:11:53,030 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:11:53,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:12:12,204 INFO L134 CoverageAnalysis]: Checked inductivity of 20353 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-12-14 12:12:12,204 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:12:12,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [156314534] [2022-12-14 12:12:12,204 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [156314534] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:12:12,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1633214296] [2022-12-14 12:12:12,204 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 12:12:12,204 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:12:12,204 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:12:12,205 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:12:12,206 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 12:12:12,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:12:12,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 3660 conjuncts, 202 conjunts are in the unsatisfiable core [2022-12-14 12:12:12,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:12:13,063 INFO L134 CoverageAnalysis]: Checked inductivity of 20353 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-12-14 12:12:13,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:12:41,363 INFO L134 CoverageAnalysis]: Checked inductivity of 20353 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-12-14 12:12:41,363 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1633214296] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:12:41,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [976825274] [2022-12-14 12:12:41,364 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:12:41,364 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:12:41,365 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:12:41,365 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:12:41,365 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:12:41,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:12:41,376 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:12:41,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:12:41,408 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-12-14 12:12:41,409 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-12-14 12:12:41,416 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:12:41,416 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:12:41,417 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:12:41,417 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 13 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2022-12-14 12:12:41,433 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:12:41,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:12:41,435 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-12-14 12:12:41,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:12:41,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:12:41,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:12:41,512 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:12:41,512 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:12:41,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:12:41,515 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:12:41,542 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-12-14 12:12:41,542 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 380 treesize of output 348 [2022-12-14 12:12:41,601 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:12:41,610 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-12-14 12:12:41,610 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2022-12-14 12:12:41,647 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-12-14 12:12:41,647 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 50 [2022-12-14 12:12:41,677 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:12:41,678 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:12:41,701 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-12-14 12:12:41,701 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-12-14 12:12:41,725 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-12-14 12:12:41,735 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:12:42,895 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8683#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_10| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_10| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_10|) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_10|) (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_10|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_10|) 0)) 1 0)))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:12:42,895 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:12:42,895 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:12:42,895 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [202, 202, 202] total 404 [2022-12-14 12:12:42,896 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142956482] [2022-12-14 12:12:42,896 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:12:42,897 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 405 states [2022-12-14 12:12:42,897 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:12:42,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 405 interpolants. [2022-12-14 12:12:42,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81835, Invalid=88321, Unknown=0, NotChecked=0, Total=170156 [2022-12-14 12:12:42,926 INFO L87 Difference]: Start difference. First operand 239 states and 244 transitions. Second operand has 405 states, 405 states have (on average 1.019753086419753) internal successors, (413), 404 states have internal predecessors, (413), 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) [2022-12-14 12:12:44,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:12:44,636 INFO L93 Difference]: Finished difference Result 478 states and 689 transitions. [2022-12-14 12:12:44,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 404 states. [2022-12-14 12:12:44,637 INFO L78 Accepts]: Start accepts. Automaton has has 405 states, 405 states have (on average 1.019753086419753) internal successors, (413), 404 states have internal predecessors, (413), 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 231 [2022-12-14 12:12:44,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:12:44,638 INFO L225 Difference]: With dead ends: 478 [2022-12-14 12:12:44,638 INFO L226 Difference]: Without dead ends: 441 [2022-12-14 12:12:44,646 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 893 GetRequests, 482 SyntacticMatches, 0 SemanticMatches, 411 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5630 ImplicationChecksByTransitivity, 38.9s TimeCoverageRelationStatistics Valid=81835, Invalid=88321, Unknown=0, NotChecked=0, Total=170156 [2022-12-14 12:12:44,647 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 440 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 441 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 12:12:44,647 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 84 Invalid, 441 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 440 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 12:12:44,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2022-12-14 12:12:44,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 441. [2022-12-14 12:12:44,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 441 states, 437 states have (on average 1.011441647597254) internal successors, (442), 437 states have internal predecessors, (442), 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) [2022-12-14 12:12:44,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 446 transitions. [2022-12-14 12:12:44,664 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 446 transitions. Word has length 231 [2022-12-14 12:12:44,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:12:44,664 INFO L495 AbstractCegarLoop]: Abstraction has 441 states and 446 transitions. [2022-12-14 12:12:44,665 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 405 states, 405 states have (on average 1.019753086419753) internal successors, (413), 404 states have internal predecessors, (413), 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) [2022-12-14 12:12:44,665 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 446 transitions. [2022-12-14 12:12:44,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 434 [2022-12-14 12:12:44,669 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:12:44,669 INFO L195 NwaCegarLoop]: trace histogram [402, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:12:44,679 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-12-14 12:12:44,870 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-12-14 12:12:44,871 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:12:44,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:12:44,872 INFO L85 PathProgramCache]: Analyzing trace with hash -1672204136, now seen corresponding path program 11 times [2022-12-14 12:12:44,872 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:12:44,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [836255878] [2022-12-14 12:12:44,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:12:44,873 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:12:45,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:14:08,400 INFO L134 CoverageAnalysis]: Checked inductivity of 81256 backedges. 0 proven. 81003 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-12-14 12:14:08,400 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:14:08,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [836255878] [2022-12-14 12:14:08,400 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [836255878] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:14:08,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [908884966] [2022-12-14 12:14:08,400 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:14:08,400 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:14:08,401 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:14:08,401 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:14:08,402 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 12:14:31,617 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-12-14 12:14:31,617 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:14:31,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 634 conjuncts, 24 conjunts are in the unsatisfiable core [2022-12-14 12:14:31,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:14:34,390 INFO L134 CoverageAnalysis]: Checked inductivity of 81256 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 81003 trivial. 0 not checked. [2022-12-14 12:14:34,390 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:14:38,032 INFO L134 CoverageAnalysis]: Checked inductivity of 81256 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 81003 trivial. 0 not checked. [2022-12-14 12:14:38,032 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [908884966] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:14:38,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [300933906] [2022-12-14 12:14:38,034 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:14:38,034 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:14:38,034 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:14:38,034 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:14:38,034 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:14:38,045 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:14:38,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:14:38,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:14:38,088 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-12-14 12:14:38,088 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-12-14 12:14:38,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:14:38,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:14:38,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:14:38,152 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-12-14 12:14:38,152 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-12-14 12:14:38,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:14:38,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:14:38,184 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-12-14 12:14:38,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:14:38,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:14:38,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:14:38,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:14:38,248 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:14:38,250 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:14:38,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:14:38,281 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-12-14 12:14:38,281 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 380 treesize of output 348 [2022-12-14 12:14:38,347 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:14:38,357 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-12-14 12:14:38,357 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2022-12-14 12:14:38,379 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:14:38,380 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:14:38,405 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-12-14 12:14:38,405 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-12-14 12:14:38,452 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:14:38,452 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:14:38,473 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-12-14 12:14:38,473 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-12-14 12:14:38,498 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-12-14 12:14:38,507 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:14:40,550 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13543#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_11| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_11| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_11|) (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_11|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_11|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_11|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:14:40,550 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:14:40,550 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:14:40,551 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [404, 24, 24] total 450 [2022-12-14 12:14:40,551 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708136588] [2022-12-14 12:14:40,551 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:14:40,552 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 451 states [2022-12-14 12:14:40,552 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:14:40,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 451 interpolants. [2022-12-14 12:14:40,572 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83008, Invalid=127214, Unknown=0, NotChecked=0, Total=210222 [2022-12-14 12:14:40,573 INFO L87 Difference]: Start difference. First operand 441 states and 446 transitions. Second operand has 451 states, 451 states have (on average 1.0266075388026608) internal successors, (463), 450 states have internal predecessors, (463), 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) [2022-12-14 12:15:35,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:15:35,367 INFO L93 Difference]: Finished difference Result 503 states and 537 transitions. [2022-12-14 12:15:35,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 451 states. [2022-12-14 12:15:35,368 INFO L78 Accepts]: Start accepts. Automaton has has 451 states, 451 states have (on average 1.0266075388026608) internal successors, (463), 450 states have internal predecessors, (463), 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 433 [2022-12-14 12:15:35,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:15:35,370 INFO L225 Difference]: With dead ends: 503 [2022-12-14 12:15:35,370 INFO L226 Difference]: Without dead ends: 466 [2022-12-14 12:15:35,408 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2104 GetRequests, 1244 SyntacticMatches, 0 SemanticMatches, 860 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104894 ImplicationChecksByTransitivity, 93.6s TimeCoverageRelationStatistics Valid=264761, Invalid=477421, Unknown=0, NotChecked=0, Total=742182 [2022-12-14 12:15:35,409 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 505 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 506 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 505 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 12:15:35,409 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 140 Invalid, 506 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 505 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 12:15:35,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2022-12-14 12:15:35,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 466. [2022-12-14 12:15:35,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 466 states, 462 states have (on average 1.0108225108225108) internal successors, (467), 462 states have internal predecessors, (467), 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) [2022-12-14 12:15:35,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 471 transitions. [2022-12-14 12:15:35,426 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 471 transitions. Word has length 433 [2022-12-14 12:15:35,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:15:35,427 INFO L495 AbstractCegarLoop]: Abstraction has 466 states and 471 transitions. [2022-12-14 12:15:35,427 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 451 states, 451 states have (on average 1.0266075388026608) internal successors, (463), 450 states have internal predecessors, (463), 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) [2022-12-14 12:15:35,427 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 471 transitions. [2022-12-14 12:15:35,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 459 [2022-12-14 12:15:35,432 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:15:35,432 INFO L195 NwaCegarLoop]: trace histogram [403, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:15:35,446 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-12-14 12:15:35,633 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-12-14 12:15:35,633 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:15:35,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:15:35,635 INFO L85 PathProgramCache]: Analyzing trace with hash 327751707, now seen corresponding path program 12 times [2022-12-14 12:15:35,635 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:15:35,635 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1906708392] [2022-12-14 12:15:35,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:15:35,636 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:15:36,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:17:02,718 INFO L134 CoverageAnalysis]: Checked inductivity of 82487 backedges. 0 proven. 81406 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2022-12-14 12:17:02,718 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:17:02,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1906708392] [2022-12-14 12:17:02,718 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1906708392] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:17:02,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [366524579] [2022-12-14 12:17:02,718 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:17:02,718 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:17:02,719 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:17:02,719 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:17:02,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 12:17:04,037 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:17:04,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:17:04,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 7303 conjuncts, 405 conjunts are in the unsatisfiable core [2022-12-14 12:17:04,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:17:04,432 INFO L134 CoverageAnalysis]: Checked inductivity of 82487 backedges. 0 proven. 81406 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2022-12-14 12:17:04,432 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:19:08,810 INFO L134 CoverageAnalysis]: Checked inductivity of 82487 backedges. 0 proven. 81406 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2022-12-14 12:19:08,811 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [366524579] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:19:08,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2100561390] [2022-12-14 12:19:08,812 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 12:19:08,813 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:19:08,813 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:19:08,813 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:19:08,813 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:19:08,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:19:08,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:19:08,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:19:08,854 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-12-14 12:19:08,855 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-12-14 12:19:08,867 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:19:08,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:19:08,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:19:08,905 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-12-14 12:19:08,905 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-12-14 12:19:08,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:19:08,928 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:19:08,929 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-12-14 12:19:08,986 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:19:08,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:19:08,989 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:19:08,989 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:19:08,990 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:19:09,030 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-12-14 12:19:09,030 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 360 treesize of output 350 [2022-12-14 12:19:09,269 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:19:09,276 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-12-14 12:19:09,276 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2022-12-14 12:19:09,305 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-12-14 12:19:09,306 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 50 [2022-12-14 12:19:09,333 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:19:09,334 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:19:09,353 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-12-14 12:19:09,353 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-12-14 12:19:09,396 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:19:09,397 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 12:19:09,415 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-12-14 12:19:09,415 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-12-14 12:19:09,437 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-12-14 12:19:09,445 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:19:11,452 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19819#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_12| Int) (|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_12| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_12|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_12|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_12|) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_12|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 12:19:11,453 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:19:11,453 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:19:11,453 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [405, 405, 405] total 810 [2022-12-14 12:19:11,453 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1031865098] [2022-12-14 12:19:11,453 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:19:11,454 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 811 states [2022-12-14 12:19:11,454 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:19:11,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 811 interpolants. [2022-12-14 12:19:11,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=328480, Invalid=341462, Unknown=0, NotChecked=0, Total=669942 [2022-12-14 12:19:11,530 INFO L87 Difference]: Start difference. First operand 466 states and 471 transitions. Second operand has 811 states, 811 states have (on average 1.0098643649815042) internal successors, (819), 810 states have internal predecessors, (819), 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) [2022-12-14 12:19:27,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:19:27,872 INFO L93 Difference]: Finished difference Result 932 states and 1346 transitions. [2022-12-14 12:19:27,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 810 states. [2022-12-14 12:19:27,873 INFO L78 Accepts]: Start accepts. Automaton has has 811 states, 811 states have (on average 1.0098643649815042) internal successors, (819), 810 states have internal predecessors, (819), 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 458 [2022-12-14 12:19:27,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:19:27,878 INFO L225 Difference]: With dead ends: 932 [2022-12-14 12:19:27,878 INFO L226 Difference]: Without dead ends: 871 [2022-12-14 12:19:27,912 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1777 GetRequests, 960 SyntacticMatches, 0 SemanticMatches, 817 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11314 ImplicationChecksByTransitivity, 165.8s TimeCoverageRelationStatistics Valid=328480, Invalid=341462, Unknown=0, NotChecked=0, Total=669942 [2022-12-14 12:19:27,912 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 840 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 841 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 840 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-12-14 12:19:27,913 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 70 Invalid, 841 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 840 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-12-14 12:19:27,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 871 states. [2022-12-14 12:19:27,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 871 to 871. [2022-12-14 12:19:27,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 871 states, 867 states have (on average 1.0057670126874279) internal successors, (872), 867 states have internal predecessors, (872), 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) [2022-12-14 12:19:27,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 871 states to 871 states and 876 transitions. [2022-12-14 12:19:27,943 INFO L78 Accepts]: Start accepts. Automaton has 871 states and 876 transitions. Word has length 458 [2022-12-14 12:19:27,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:19:27,944 INFO L495 AbstractCegarLoop]: Abstraction has 871 states and 876 transitions. [2022-12-14 12:19:27,944 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 811 states, 811 states have (on average 1.0098643649815042) internal successors, (819), 810 states have internal predecessors, (819), 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) [2022-12-14 12:19:27,944 INFO L276 IsEmpty]: Start isEmpty. Operand 871 states and 876 transitions. [2022-12-14 12:19:27,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 864 [2022-12-14 12:19:27,949 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:19:27,949 INFO L195 NwaCegarLoop]: trace histogram [808, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:19:27,965 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-12-14 12:19:28,149 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd4064e5-57b9-4cba-bfa5-532ee89a03f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:19:28,150 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:19:28,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:19:28,151 INFO L85 PathProgramCache]: Analyzing trace with hash -1748236232, now seen corresponding path program 13 times [2022-12-14 12:19:28,152 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:19:28,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [138928927] [2022-12-14 12:19:28,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:19:28,153 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:19:31,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat