./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 b5237d83 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_compareModified_ground.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba --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-b5237d8 [2022-11-22 02:40:39,311 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-22 02:40:39,313 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-22 02:40:39,340 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-22 02:40:39,340 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-22 02:40:39,344 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-22 02:40:39,346 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-22 02:40:39,350 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-22 02:40:39,352 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-22 02:40:39,358 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-22 02:40:39,359 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-22 02:40:39,362 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-22 02:40:39,362 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-22 02:40:39,367 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-22 02:40:39,369 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-22 02:40:39,371 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-22 02:40:39,372 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-22 02:40:39,373 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-22 02:40:39,375 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-22 02:40:39,382 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-22 02:40:39,383 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-22 02:40:39,385 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-22 02:40:39,387 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-22 02:40:39,388 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-22 02:40:39,397 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-22 02:40:39,398 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-22 02:40:39,398 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-22 02:40:39,400 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-22 02:40:39,401 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-22 02:40:39,402 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-22 02:40:39,403 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-22 02:40:39,403 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-22 02:40:39,405 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-22 02:40:39,407 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-22 02:40:39,408 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-22 02:40:39,408 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-22 02:40:39,409 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-22 02:40:39,409 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-22 02:40:39,409 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-22 02:40:39,411 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-22 02:40:39,412 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-22 02:40:39,413 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-22 02:40:39,456 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-22 02:40:39,457 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-22 02:40:39,457 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-22 02:40:39,457 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-22 02:40:39,458 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-22 02:40:39,458 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-22 02:40:39,459 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-22 02:40:39,459 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-22 02:40:39,459 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-22 02:40:39,459 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-22 02:40:39,460 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-22 02:40:39,460 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-22 02:40:39,460 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-22 02:40:39,460 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-22 02:40:39,461 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-22 02:40:39,461 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-22 02:40:39,461 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-22 02:40:39,462 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-22 02:40:39,462 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-22 02:40:39,467 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-22 02:40:39,467 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-22 02:40:39,467 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-22 02:40:39,468 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-22 02:40:39,468 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-22 02:40:39,468 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-22 02:40:39,469 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-22 02:40:39,469 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-22 02:40:39,469 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-22 02:40:39,470 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-22 02:40:39,470 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-22 02:40:39,471 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-22 02:40:39,471 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-22 02:40:39,471 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 02:40:39,472 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-22 02:40:39,472 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-22 02:40:39,472 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-22 02:40:39,473 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-22 02:40:39,473 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-22 02:40:39,474 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-22 02:40:39,474 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-22 02:40:39,474 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-22 02:40:39,474 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_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ec4d4b5cea975144b4de3d9f9eb9b04d1c4b7aa6b7464f360f53530c4a9bd50e [2022-11-22 02:40:39,771 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-22 02:40:39,802 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-22 02:40:39,806 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-22 02:40:39,807 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-22 02:40:39,807 INFO L275 PluginConnector]: CDTParser initialized [2022-11-22 02:40:39,809 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/../../sv-benchmarks/c/array-examples/standard_compareModified_ground.i [2022-11-22 02:40:42,856 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-22 02:40:43,140 INFO L351 CDTParser]: Found 1 translation units. [2022-11-22 02:40:43,141 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/sv-benchmarks/c/array-examples/standard_compareModified_ground.i [2022-11-22 02:40:43,147 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/data/0c5e9c323/527fe3f8087d4f15b8f68b76ae4a1ea2/FLAG20d67b88e [2022-11-22 02:40:43,161 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/data/0c5e9c323/527fe3f8087d4f15b8f68b76ae4a1ea2 [2022-11-22 02:40:43,164 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-22 02:40:43,165 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-22 02:40:43,167 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-22 02:40:43,167 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-22 02:40:43,170 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-22 02:40:43,171 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 02:40:43" (1/1) ... [2022-11-22 02:40:43,172 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@52cc02a9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:40:43, skipping insertion in model container [2022-11-22 02:40:43,173 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 02:40:43" (1/1) ... [2022-11-22 02:40:43,180 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-22 02:40:43,194 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-22 02:40:43,330 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_e60bd560-cd2e-49df-8fd2-836d100a45f0/sv-benchmarks/c/array-examples/standard_compareModified_ground.i[824,837] [2022-11-22 02:40:43,348 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 02:40:43,356 INFO L203 MainTranslator]: Completed pre-run [2022-11-22 02:40:43,366 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_e60bd560-cd2e-49df-8fd2-836d100a45f0/sv-benchmarks/c/array-examples/standard_compareModified_ground.i[824,837] [2022-11-22 02:40:43,374 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 02:40:43,388 INFO L208 MainTranslator]: Completed translation [2022-11-22 02:40:43,388 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:40:43 WrapperNode [2022-11-22 02:40:43,389 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-22 02:40:43,390 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-22 02:40:43,390 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-22 02:40:43,390 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-22 02:40:43,398 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:40:43" (1/1) ... [2022-11-22 02:40:43,405 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:40:43" (1/1) ... [2022-11-22 02:40:43,421 INFO L138 Inliner]: procedures = 16, calls = 27, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 86 [2022-11-22 02:40:43,421 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-22 02:40:43,422 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-22 02:40:43,422 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-22 02:40:43,422 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-22 02:40:43,429 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:40:43" (1/1) ... [2022-11-22 02:40:43,430 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:40:43" (1/1) ... [2022-11-22 02:40:43,432 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:40:43" (1/1) ... [2022-11-22 02:40:43,432 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:40:43" (1/1) ... [2022-11-22 02:40:43,438 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:40:43" (1/1) ... [2022-11-22 02:40:43,442 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:40:43" (1/1) ... [2022-11-22 02:40:43,443 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:40:43" (1/1) ... [2022-11-22 02:40:43,444 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:40:43" (1/1) ... [2022-11-22 02:40:43,446 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-22 02:40:43,447 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-22 02:40:43,447 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-22 02:40:43,447 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-22 02:40:43,448 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:40:43" (1/1) ... [2022-11-22 02:40:43,455 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 02:40:43,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:40:43,488 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-22 02:40:43,501 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-22 02:40:43,525 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-22 02:40:43,525 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-22 02:40:43,525 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-22 02:40:43,525 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-22 02:40:43,525 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-22 02:40:43,525 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-22 02:40:43,525 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-22 02:40:43,525 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-22 02:40:43,526 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-22 02:40:43,526 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-22 02:40:43,593 INFO L235 CfgBuilder]: Building ICFG [2022-11-22 02:40:43,595 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-22 02:40:43,852 INFO L276 CfgBuilder]: Performing block encoding [2022-11-22 02:40:43,931 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-22 02:40:43,931 INFO L300 CfgBuilder]: Removed 4 assume(true) statements. [2022-11-22 02:40:43,934 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 02:40:43 BoogieIcfgContainer [2022-11-22 02:40:43,934 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-22 02:40:43,937 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-22 02:40:43,937 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-22 02:40:43,941 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-22 02:40:43,941 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 02:40:43" (1/3) ... [2022-11-22 02:40:43,942 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@13b9ac1d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 02:40:43, skipping insertion in model container [2022-11-22 02:40:43,942 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:40:43" (2/3) ... [2022-11-22 02:40:43,942 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@13b9ac1d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 02:40:43, skipping insertion in model container [2022-11-22 02:40:43,942 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 02:40:43" (3/3) ... [2022-11-22 02:40:43,944 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_compareModified_ground.i [2022-11-22 02:40:43,963 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-22 02:40:43,979 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-22 02:40:44,067 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-22 02:40:44,074 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;@64d7b4b8, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-22 02:40:44,074 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-22 02:40:44,082 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) [2022-11-22 02:40:44,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-22 02:40:44,093 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:40:44,095 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:40:44,095 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:40:44,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:40:44,109 INFO L85 PathProgramCache]: Analyzing trace with hash 1259005784, now seen corresponding path program 1 times [2022-11-22 02:40:44,119 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:40:44,120 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [292368042] [2022-11-22 02:40:44,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:40:44,120 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:40:44,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:40:44,385 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:40:44,385 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:40:44,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [292368042] [2022-11-22 02:40:44,387 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [292368042] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:40:44,387 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:40:44,387 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-22 02:40:44,389 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063275933] [2022-11-22 02:40:44,390 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:40:44,394 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-22 02:40:44,395 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:40:44,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-22 02:40:44,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-22 02:40:44,431 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) [2022-11-22 02:40:44,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:40:44,486 INFO L93 Difference]: Finished difference Result 35 states and 49 transitions. [2022-11-22 02:40:44,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-22 02:40:44,489 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 [2022-11-22 02:40:44,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:40:44,497 INFO L225 Difference]: With dead ends: 35 [2022-11-22 02:40:44,497 INFO L226 Difference]: Without dead ends: 18 [2022-11-22 02:40:44,500 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-22 02:40:44,504 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 [2022-11-22 02:40:44,505 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] [2022-11-22 02:40:44,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-11-22 02:40:44,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-11-22 02:40:44,541 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) [2022-11-22 02:40:44,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 23 transitions. [2022-11-22 02:40:44,545 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 23 transitions. Word has length 9 [2022-11-22 02:40:44,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:40:44,546 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 23 transitions. [2022-11-22 02:40:44,547 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) [2022-11-22 02:40:44,547 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 23 transitions. [2022-11-22 02:40:44,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-22 02:40:44,551 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:40:44,551 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:40:44,551 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-22 02:40:44,552 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:40:44,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:40:44,553 INFO L85 PathProgramCache]: Analyzing trace with hash 1981076570, now seen corresponding path program 1 times [2022-11-22 02:40:44,553 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:40:44,554 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113496643] [2022-11-22 02:40:44,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:40:44,555 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:40:44,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:40:44,727 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:40:44,727 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:40:44,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1113496643] [2022-11-22 02:40:44,728 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1113496643] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:40:44,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [255940088] [2022-11-22 02:40:44,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:40:44,729 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:40:44,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:40:44,735 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:40:44,751 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-22 02:40:44,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:40:44,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-22 02:40:44,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:40:44,887 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 02:40:44,888 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 02:40:44,888 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [255940088] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:40:44,888 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 02:40:44,889 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3] total 4 [2022-11-22 02:40:44,890 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951932379] [2022-11-22 02:40:44,890 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:40:44,891 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-22 02:40:44,891 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:40:44,891 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-22 02:40:44,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-22 02:40:44,892 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) [2022-11-22 02:40:44,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:40:44,930 INFO L93 Difference]: Finished difference Result 33 states and 42 transitions. [2022-11-22 02:40:44,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-22 02:40:44,937 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 [2022-11-22 02:40:44,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:40:44,938 INFO L225 Difference]: With dead ends: 33 [2022-11-22 02:40:44,938 INFO L226 Difference]: Without dead ends: 19 [2022-11-22 02:40:44,939 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 [2022-11-22 02:40:44,940 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 [2022-11-22 02:40:44,941 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] [2022-11-22 02:40:44,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-11-22 02:40:44,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-11-22 02:40:44,945 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) [2022-11-22 02:40:44,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 24 transitions. [2022-11-22 02:40:44,946 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 24 transitions. Word has length 10 [2022-11-22 02:40:44,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:40:44,946 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 24 transitions. [2022-11-22 02:40:44,947 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) [2022-11-22 02:40:44,947 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 24 transitions. [2022-11-22 02:40:44,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-22 02:40:44,948 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:40:44,948 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:40:44,954 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-11-22 02:40:45,148 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:40:45,150 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:40:45,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:40:45,151 INFO L85 PathProgramCache]: Analyzing trace with hash 252948675, now seen corresponding path program 1 times [2022-11-22 02:40:45,151 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:40:45,151 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [954251545] [2022-11-22 02:40:45,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:40:45,152 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:40:45,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:40:45,297 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 02:40:45,297 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:40:45,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [954251545] [2022-11-22 02:40:45,300 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [954251545] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:40:45,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [927428776] [2022-11-22 02:40:45,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:40:45,301 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:40:45,302 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:40:45,308 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:40:45,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-22 02:40:45,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:40:45,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-22 02:40:45,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:40:45,430 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 02:40:45,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:40:45,453 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 02:40:45,453 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [927428776] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:40:45,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1991719833] [2022-11-22 02:40:45,474 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:40:45,474 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:40:45,478 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:40:45,484 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:40:45,485 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:40:45,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:45,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:45,612 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:45,717 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-22 02:40:45,720 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 [2022-11-22 02:40:45,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:45,757 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:45,762 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:45,766 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 [2022-11-22 02:40:45,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:45,877 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:45,881 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 [2022-11-22 02:40:46,184 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:46,191 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:46,199 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:46,201 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:46,202 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:46,351 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-11-22 02:40:46,352 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 [2022-11-22 02:40:46,968 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:46,984 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-22 02:40:46,985 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 [2022-11-22 02:40:47,057 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-11-22 02:40:47,058 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 [2022-11-22 02:40:47,133 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:47,134 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:47,173 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-22 02:40:47,173 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 [2022-11-22 02:40:47,333 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:47,334 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:47,368 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-22 02:40:47,369 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 [2022-11-22 02:40:47,421 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-22 02:40:47,448 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:40:47,784 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 [2022-11-22 02:40:47,784 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:40:47,784 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:40:47,784 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2022-11-22 02:40:47,785 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2039980502] [2022-11-22 02:40:47,785 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:40:47,785 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-22 02:40:47,785 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:40:47,786 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-22 02:40:47,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2022-11-22 02:40:47,786 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) [2022-11-22 02:40:47,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:40:47,840 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2022-11-22 02:40:47,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 02:40:47,841 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 [2022-11-22 02:40:47,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:40:47,843 INFO L225 Difference]: With dead ends: 38 [2022-11-22 02:40:47,843 INFO L226 Difference]: Without dead ends: 22 [2022-11-22 02:40:47,845 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2022-11-22 02:40:47,850 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:40:47,853 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 42 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:40:47,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-22 02:40:47,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-11-22 02:40:47,861 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) [2022-11-22 02:40:47,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2022-11-22 02:40:47,862 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 11 [2022-11-22 02:40:47,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:40:47,863 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2022-11-22 02:40:47,863 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) [2022-11-22 02:40:47,863 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2022-11-22 02:40:47,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-22 02:40:47,865 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:40:47,865 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:40:47,877 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-22 02:40:48,072 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:40:48,072 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:40:48,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:40:48,073 INFO L85 PathProgramCache]: Analyzing trace with hash -1580081915, now seen corresponding path program 2 times [2022-11-22 02:40:48,073 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:40:48,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1981326126] [2022-11-22 02:40:48,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:40:48,074 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:40:48,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:40:48,180 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-22 02:40:48,180 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:40:48,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1981326126] [2022-11-22 02:40:48,181 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1981326126] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:40:48,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1519483719] [2022-11-22 02:40:48,181 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:40:48,182 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:40:48,182 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:40:48,183 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:40:48,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-22 02:40:48,284 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-22 02:40:48,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:40:48,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-22 02:40:48,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:40:48,307 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-22 02:40:48,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:40:48,333 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-22 02:40:48,334 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1519483719] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:40:48,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [493648608] [2022-11-22 02:40:48,337 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:40:48,337 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:40:48,338 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:40:48,338 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:40:48,338 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:40:48,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:48,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:48,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:48,445 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-22 02:40:48,447 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 [2022-11-22 02:40:48,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:48,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:48,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:48,473 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 [2022-11-22 02:40:48,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:48,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:48,523 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 [2022-11-22 02:40:48,685 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:48,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:48,692 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:48,693 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:48,694 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:48,775 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-11-22 02:40:48,776 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 [2022-11-22 02:40:49,252 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:49,266 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-22 02:40:49,267 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 [2022-11-22 02:40:49,326 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-11-22 02:40:49,327 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 [2022-11-22 02:40:49,378 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:49,379 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:49,413 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-22 02:40:49,413 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 [2022-11-22 02:40:49,458 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-22 02:40:49,475 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:40:49,791 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 [2022-11-22 02:40:49,792 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:40:49,792 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:40:49,792 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2022-11-22 02:40:49,792 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817069921] [2022-11-22 02:40:49,792 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:40:49,793 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-22 02:40:49,793 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:40:49,794 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-22 02:40:49,794 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2022-11-22 02:40:49,794 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) [2022-11-22 02:40:49,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:40:49,822 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2022-11-22 02:40:49,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 02:40:49,822 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 [2022-11-22 02:40:49,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:40:49,823 INFO L225 Difference]: With dead ends: 39 [2022-11-22 02:40:49,823 INFO L226 Difference]: Without dead ends: 25 [2022-11-22 02:40:49,824 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2022-11-22 02:40:49,825 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 4 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:40:49,825 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 28 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:40:49,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-11-22 02:40:49,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-11-22 02:40:49,830 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) [2022-11-22 02:40:49,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2022-11-22 02:40:49,831 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 14 [2022-11-22 02:40:49,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:40:49,831 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2022-11-22 02:40:49,831 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) [2022-11-22 02:40:49,832 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2022-11-22 02:40:49,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-22 02:40:49,832 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:40:49,832 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:40:49,842 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-22 02:40:50,042 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:40:50,043 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:40:50,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:40:50,043 INFO L85 PathProgramCache]: Analyzing trace with hash -843220200, now seen corresponding path program 3 times [2022-11-22 02:40:50,043 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:40:50,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [757172391] [2022-11-22 02:40:50,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:40:50,043 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:40:50,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:40:50,182 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-22 02:40:50,182 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:40:50,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [757172391] [2022-11-22 02:40:50,183 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [757172391] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:40:50,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [452984287] [2022-11-22 02:40:50,183 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:40:50,183 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:40:50,184 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:40:50,185 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:40:50,219 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-22 02:40:50,288 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:40:50,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:40:50,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-22 02:40:50,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:40:50,309 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-22 02:40:50,310 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:40:50,371 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-22 02:40:50,371 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [452984287] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:40:50,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1592578990] [2022-11-22 02:40:50,378 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:40:50,378 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:40:50,379 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:40:50,379 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:40:50,381 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:40:50,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:50,406 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:50,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:50,480 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-22 02:40:50,481 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 [2022-11-22 02:40:50,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:50,499 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:50,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:50,515 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 [2022-11-22 02:40:50,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:50,553 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:50,555 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 [2022-11-22 02:40:50,684 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:50,685 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:50,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:50,689 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:50,690 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:50,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:50,695 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:50,735 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-22 02:40:50,736 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 [2022-11-22 02:40:50,839 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:50,851 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-22 02:40:50,852 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 [2022-11-22 02:40:50,907 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-11-22 02:40:50,907 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 [2022-11-22 02:40:50,950 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:50,951 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:50,983 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-22 02:40:50,984 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 [2022-11-22 02:40:51,024 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-22 02:40:51,041 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:40:51,365 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 [2022-11-22 02:40:51,366 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:40:51,366 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:40:51,366 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2022-11-22 02:40:51,366 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255891801] [2022-11-22 02:40:51,366 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:40:51,366 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-22 02:40:51,367 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:40:51,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-22 02:40:51,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=317, Unknown=0, NotChecked=0, Total=420 [2022-11-22 02:40:51,367 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) [2022-11-22 02:40:51,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:40:51,430 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2022-11-22 02:40:51,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-22 02:40:51,431 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 [2022-11-22 02:40:51,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:40:51,432 INFO L225 Difference]: With dead ends: 50 [2022-11-22 02:40:51,432 INFO L226 Difference]: Without dead ends: 31 [2022-11-22 02:40:51,432 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=103, Invalid=317, Unknown=0, NotChecked=0, Total=420 [2022-11-22 02:40:51,433 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:40:51,434 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 70 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:40:51,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-22 02:40:51,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-11-22 02:40:51,438 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) [2022-11-22 02:40:51,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2022-11-22 02:40:51,439 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 17 [2022-11-22 02:40:51,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:40:51,439 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2022-11-22 02:40:51,439 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) [2022-11-22 02:40:51,439 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2022-11-22 02:40:51,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-22 02:40:51,440 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:40:51,440 INFO L195 NwaCegarLoop]: trace histogram [10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:40:51,447 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-22 02:40:51,646 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:40:51,646 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:40:51,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:40:51,647 INFO L85 PathProgramCache]: Analyzing trace with hash 1290300376, now seen corresponding path program 4 times [2022-11-22 02:40:51,647 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:40:51,647 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1457625187] [2022-11-22 02:40:51,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:40:51,647 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:40:51,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:40:52,020 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-22 02:40:52,020 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:40:52,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1457625187] [2022-11-22 02:40:52,020 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1457625187] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:40:52,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [356008251] [2022-11-22 02:40:52,021 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:40:52,021 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:40:52,021 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:40:52,022 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:40:52,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-22 02:40:52,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:40:52,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-22 02:40:52,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:40:52,188 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-22 02:40:52,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:40:52,390 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-22 02:40:52,391 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [356008251] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:40:52,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1152954794] [2022-11-22 02:40:52,393 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:40:52,393 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:40:52,394 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:40:52,394 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:40:52,394 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:40:52,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:52,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:52,411 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:52,471 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-11-22 02:40:52,471 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 [2022-11-22 02:40:52,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:52,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:52,499 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:52,568 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-22 02:40:52,569 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 [2022-11-22 02:40:52,610 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:52,612 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:52,615 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 [2022-11-22 02:40:52,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:52,711 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:52,714 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:52,715 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:52,716 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:52,807 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-11-22 02:40:52,808 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 [2022-11-22 02:40:53,192 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:53,204 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-22 02:40:53,204 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 [2022-11-22 02:40:53,259 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-11-22 02:40:53,260 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 [2022-11-22 02:40:53,306 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:53,307 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:53,337 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-22 02:40:53,338 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 [2022-11-22 02:40:53,385 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-22 02:40:53,403 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:40:53,755 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 [2022-11-22 02:40:53,755 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:40:53,755 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:40:53,755 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2022-11-22 02:40:53,755 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424368243] [2022-11-22 02:40:53,755 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:40:53,756 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-22 02:40:53,756 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:40:53,756 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-22 02:40:53,757 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=731, Unknown=0, NotChecked=0, Total=1056 [2022-11-22 02:40:53,757 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) [2022-11-22 02:40:53,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:40:53,817 INFO L93 Difference]: Finished difference Result 62 states and 83 transitions. [2022-11-22 02:40:53,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-22 02:40:53,818 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 [2022-11-22 02:40:53,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:40:53,818 INFO L225 Difference]: With dead ends: 62 [2022-11-22 02:40:53,818 INFO L226 Difference]: Without dead ends: 43 [2022-11-22 02:40:53,819 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=325, Invalid=731, Unknown=0, NotChecked=0, Total=1056 [2022-11-22 02:40:53,820 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:40:53,821 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 56 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:40:53,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-11-22 02:40:53,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2022-11-22 02:40:53,826 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) [2022-11-22 02:40:53,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 48 transitions. [2022-11-22 02:40:53,828 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 48 transitions. Word has length 23 [2022-11-22 02:40:53,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:40:53,828 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 48 transitions. [2022-11-22 02:40:53,828 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) [2022-11-22 02:40:53,828 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 48 transitions. [2022-11-22 02:40:53,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-22 02:40:53,829 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:40:53,829 INFO L195 NwaCegarLoop]: trace histogram [22, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:40:53,852 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-22 02:40:54,035 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-22 02:40:54,035 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:40:54,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:40:54,036 INFO L85 PathProgramCache]: Analyzing trace with hash -1856791208, now seen corresponding path program 5 times [2022-11-22 02:40:54,036 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:40:54,037 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044606928] [2022-11-22 02:40:54,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:40:54,037 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:40:54,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:40:54,817 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-22 02:40:54,817 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:40:54,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2044606928] [2022-11-22 02:40:54,818 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2044606928] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:40:54,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1211894819] [2022-11-22 02:40:54,818 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:40:54,818 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:40:54,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:40:54,823 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:40:54,850 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-22 02:40:54,976 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-22 02:40:54,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:40:54,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-22 02:40:54,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:40:55,099 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-22 02:40:55,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:40:55,257 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-22 02:40:55,258 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1211894819] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:40:55,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [505676989] [2022-11-22 02:40:55,260 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:40:55,261 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:40:55,261 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:40:55,262 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:40:55,262 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:40:55,284 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:55,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:55,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:55,350 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-22 02:40:55,351 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 [2022-11-22 02:40:55,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:55,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:55,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:55,370 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 [2022-11-22 02:40:55,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:55,398 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:55,399 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 [2022-11-22 02:40:55,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:55,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:55,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:55,512 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:55,513 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:55,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:55,517 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:55,548 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-22 02:40:55,548 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 [2022-11-22 02:40:55,640 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:55,654 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-22 02:40:55,654 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 [2022-11-22 02:40:55,677 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:55,678 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:55,707 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-22 02:40:55,707 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 [2022-11-22 02:40:55,747 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:55,748 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:55,776 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-22 02:40:55,777 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 [2022-11-22 02:40:55,850 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-22 02:40:55,867 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:40:56,332 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 [2022-11-22 02:40:56,332 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:40:56,332 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:40:56,332 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 6, 6] total 34 [2022-11-22 02:40:56,332 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126885400] [2022-11-22 02:40:56,332 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:40:56,333 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-22 02:40:56,333 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:40:56,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-22 02:40:56,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=400, Invalid=1406, Unknown=0, NotChecked=0, Total=1806 [2022-11-22 02:40:56,335 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) [2022-11-22 02:40:56,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:40:56,924 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2022-11-22 02:40:56,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-22 02:40:56,926 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 [2022-11-22 02:40:56,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:40:56,928 INFO L225 Difference]: With dead ends: 69 [2022-11-22 02:40:56,929 INFO L226 Difference]: Without dead ends: 50 [2022-11-22 02:40:56,932 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 862 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1205, Invalid=3085, Unknown=0, NotChecked=0, Total=4290 [2022-11-22 02:40:56,933 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 100 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:40:56,933 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 126 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:40:56,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-22 02:40:56,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-11-22 02:40:56,949 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) [2022-11-22 02:40:56,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2022-11-22 02:40:56,956 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 35 [2022-11-22 02:40:56,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:40:56,956 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2022-11-22 02:40:56,956 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) [2022-11-22 02:40:56,957 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2022-11-22 02:40:56,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-22 02:40:56,961 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:40:56,961 INFO L195 NwaCegarLoop]: trace histogram [23, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:40:56,971 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-22 02:40:57,166 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-22 02:40:57,167 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:40:57,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:40:57,167 INFO L85 PathProgramCache]: Analyzing trace with hash -1217782982, now seen corresponding path program 6 times [2022-11-22 02:40:57,167 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:40:57,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [322579753] [2022-11-22 02:40:57,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:40:57,168 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:40:57,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:40:58,064 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-22 02:40:58,065 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:40:58,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [322579753] [2022-11-22 02:40:58,065 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [322579753] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:40:58,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [868917689] [2022-11-22 02:40:58,065 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:40:58,065 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:40:58,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:40:58,067 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:40:58,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-22 02:40:58,280 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:40:58,281 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:40:58,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 555 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-22 02:40:58,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:40:58,344 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-22 02:40:58,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:40:59,207 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-22 02:40:59,207 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [868917689] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:40:59,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1217570628] [2022-11-22 02:40:59,209 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:40:59,209 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:40:59,209 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:40:59,209 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:40:59,209 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:40:59,234 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:59,235 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:59,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:59,289 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-11-22 02:40:59,290 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 [2022-11-22 02:40:59,316 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:59,319 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:59,321 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:59,383 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-22 02:40:59,383 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 [2022-11-22 02:40:59,417 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:59,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:59,420 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 [2022-11-22 02:40:59,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:59,506 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:40:59,509 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:59,510 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:59,512 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:59,579 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-11-22 02:40:59,580 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 [2022-11-22 02:40:59,930 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:40:59,946 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-22 02:40:59,947 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 [2022-11-22 02:40:59,999 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-11-22 02:41:00,000 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 [2022-11-22 02:41:00,042 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:00,043 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:00,072 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-22 02:41:00,072 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 [2022-11-22 02:41:00,110 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-22 02:41:00,124 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:41:00,547 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 [2022-11-22 02:41:00,548 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:41:00,548 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:41:00,548 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 50 [2022-11-22 02:41:00,548 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611009042] [2022-11-22 02:41:00,548 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:41:00,549 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-11-22 02:41:00,549 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:41:00,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-11-22 02:41:00,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1300, Invalid=2122, Unknown=0, NotChecked=0, Total=3422 [2022-11-22 02:41:00,552 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) [2022-11-22 02:41:00,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:41:00,699 INFO L93 Difference]: Finished difference Result 100 states and 134 transitions. [2022-11-22 02:41:00,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-22 02:41:00,700 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 [2022-11-22 02:41:00,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:41:00,704 INFO L225 Difference]: With dead ends: 100 [2022-11-22 02:41:00,704 INFO L226 Difference]: Without dead ends: 75 [2022-11-22 02:41:00,706 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 674 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1300, Invalid=2122, Unknown=0, NotChecked=0, Total=3422 [2022-11-22 02:41:00,707 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:41:00,707 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 70 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:41:00,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-11-22 02:41:00,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2022-11-22 02:41:00,717 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) [2022-11-22 02:41:00,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 80 transitions. [2022-11-22 02:41:00,718 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 80 transitions. Word has length 42 [2022-11-22 02:41:00,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:41:00,719 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 80 transitions. [2022-11-22 02:41:00,719 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) [2022-11-22 02:41:00,719 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 80 transitions. [2022-11-22 02:41:00,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-11-22 02:41:00,721 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:41:00,721 INFO L195 NwaCegarLoop]: trace histogram [48, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:41:00,732 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-22 02:41:00,927 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:41:00,927 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:41:00,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:41:00,928 INFO L85 PathProgramCache]: Analyzing trace with hash 939129208, now seen corresponding path program 7 times [2022-11-22 02:41:00,928 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:41:00,928 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [648102807] [2022-11-22 02:41:00,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:41:00,928 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:41:01,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:41:03,683 INFO L134 CoverageAnalysis]: Checked inductivity of 1231 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-22 02:41:03,683 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:41:03,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [648102807] [2022-11-22 02:41:03,684 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [648102807] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:41:03,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [350632652] [2022-11-22 02:41:03,684 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:41:03,684 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:41:03,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:41:03,687 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:41:03,707 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-22 02:41:04,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:41:04,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 980 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-22 02:41:04,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:41:04,128 INFO L134 CoverageAnalysis]: Checked inductivity of 1231 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-22 02:41:04,129 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:41:07,313 INFO L134 CoverageAnalysis]: Checked inductivity of 1231 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-22 02:41:07,313 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [350632652] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:41:07,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [764622899] [2022-11-22 02:41:07,315 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:41:07,315 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:41:07,315 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:41:07,316 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:41:07,316 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:41:07,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:07,335 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:07,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:07,385 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-11-22 02:41:07,385 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 [2022-11-22 02:41:07,402 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:07,405 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:07,406 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:07,465 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-22 02:41:07,466 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 [2022-11-22 02:41:07,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:07,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:07,512 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 [2022-11-22 02:41:07,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:07,615 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:07,618 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:07,619 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:07,620 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:07,683 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-11-22 02:41:07,683 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 [2022-11-22 02:41:08,053 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:08,064 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-22 02:41:08,065 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 [2022-11-22 02:41:08,088 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:08,091 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:08,120 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-22 02:41:08,120 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 [2022-11-22 02:41:08,159 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:08,159 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:08,188 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-22 02:41:08,188 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 [2022-11-22 02:41:08,228 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-22 02:41:08,243 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:41:08,787 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 [2022-11-22 02:41:08,787 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:41:08,787 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:41:08,787 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 100 [2022-11-22 02:41:08,787 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491785040] [2022-11-22 02:41:08,787 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:41:08,788 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2022-11-22 02:41:08,788 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:41:08,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2022-11-22 02:41:08,792 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5075, Invalid=6697, Unknown=0, NotChecked=0, Total=11772 [2022-11-22 02:41:08,793 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) [2022-11-22 02:41:09,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:41:09,017 INFO L93 Difference]: Finished difference Result 150 states and 209 transitions. [2022-11-22 02:41:09,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2022-11-22 02:41:09,017 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 [2022-11-22 02:41:09,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:41:09,018 INFO L225 Difference]: With dead ends: 150 [2022-11-22 02:41:09,019 INFO L226 Difference]: Without dead ends: 125 [2022-11-22 02:41:09,021 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1374 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=5075, Invalid=6697, Unknown=0, NotChecked=0, Total=11772 [2022-11-22 02:41:09,022 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:41:09,023 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 98 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:41:09,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2022-11-22 02:41:09,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2022-11-22 02:41:09,034 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) [2022-11-22 02:41:09,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 130 transitions. [2022-11-22 02:41:09,035 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 130 transitions. Word has length 67 [2022-11-22 02:41:09,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:41:09,035 INFO L495 AbstractCegarLoop]: Abstraction has 125 states and 130 transitions. [2022-11-22 02:41:09,036 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) [2022-11-22 02:41:09,036 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 130 transitions. [2022-11-22 02:41:09,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2022-11-22 02:41:09,037 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:41:09,037 INFO L195 NwaCegarLoop]: trace histogram [98, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:41:09,049 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-11-22 02:41:09,244 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:41:09,244 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:41:09,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:41:09,244 INFO L85 PathProgramCache]: Analyzing trace with hash 760188856, now seen corresponding path program 8 times [2022-11-22 02:41:09,245 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:41:09,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1324196778] [2022-11-22 02:41:09,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:41:09,245 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:41:09,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:41:17,928 INFO L134 CoverageAnalysis]: Checked inductivity of 4906 backedges. 0 proven. 4851 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-22 02:41:17,928 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:41:17,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1324196778] [2022-11-22 02:41:17,928 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1324196778] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:41:17,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1474534839] [2022-11-22 02:41:17,928 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:41:17,928 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:41:17,929 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:41:17,929 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:41:17,935 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-22 02:41:19,408 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-22 02:41:19,409 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:41:19,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-22 02:41:19,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:41:20,090 INFO L134 CoverageAnalysis]: Checked inductivity of 4906 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2022-11-22 02:41:20,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:41:20,841 INFO L134 CoverageAnalysis]: Checked inductivity of 4906 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2022-11-22 02:41:20,842 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1474534839] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:41:20,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1495844551] [2022-11-22 02:41:20,843 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:41:20,844 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:41:20,844 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:41:20,844 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:41:20,844 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:41:20,856 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:20,857 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:20,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:20,916 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-11-22 02:41:20,916 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 [2022-11-22 02:41:20,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:20,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:20,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:20,999 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-22 02:41:21,000 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 [2022-11-22 02:41:21,044 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:21,045 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:21,047 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 [2022-11-22 02:41:21,165 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:21,166 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:21,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:21,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:21,170 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:21,173 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:21,174 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:21,207 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-22 02:41:21,208 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 [2022-11-22 02:41:21,302 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:21,313 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-22 02:41:21,313 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 [2022-11-22 02:41:21,333 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:21,334 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:21,364 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-22 02:41:21,364 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 [2022-11-22 02:41:21,401 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:21,402 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:21,431 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-22 02:41:21,431 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 [2022-11-22 02:41:21,515 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:21,516 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:21,544 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-22 02:41:21,544 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 [2022-11-22 02:41:21,574 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-22 02:41:21,587 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:41:22,436 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 [2022-11-22 02:41:22,436 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:41:22,437 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:41:22,437 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 12, 12] total 122 [2022-11-22 02:41:22,437 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1289288874] [2022-11-22 02:41:22,437 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:41:22,438 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2022-11-22 02:41:22,438 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:41:22,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2022-11-22 02:41:22,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5372, Invalid=11658, Unknown=0, NotChecked=0, Total=17030 [2022-11-22 02:41:22,444 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) [2022-11-22 02:41:27,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:41:27,714 INFO L93 Difference]: Finished difference Result 163 states and 185 transitions. [2022-11-22 02:41:27,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2022-11-22 02:41:27,715 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 [2022-11-22 02:41:27,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:41:27,716 INFO L225 Difference]: With dead ends: 163 [2022-11-22 02:41:27,716 INFO L226 Difference]: Without dead ends: 138 [2022-11-22 02:41:27,723 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 548 GetRequests, 320 SyntacticMatches, 0 SemanticMatches, 228 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8458 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=17549, Invalid=35121, Unknown=0, NotChecked=0, Total=52670 [2022-11-22 02:41:27,724 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 404 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 195 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 404 SdHoareTripleChecker+Valid, 182 SdHoareTripleChecker+Invalid, 214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:41:27,724 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [404 Valid, 182 Invalid, 214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 195 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:41:27,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2022-11-22 02:41:27,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 138. [2022-11-22 02:41:27,736 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) [2022-11-22 02:41:27,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 143 transitions. [2022-11-22 02:41:27,737 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 143 transitions. Word has length 117 [2022-11-22 02:41:27,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:41:27,738 INFO L495 AbstractCegarLoop]: Abstraction has 138 states and 143 transitions. [2022-11-22 02:41:27,738 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) [2022-11-22 02:41:27,738 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 143 transitions. [2022-11-22 02:41:27,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2022-11-22 02:41:27,740 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:41:27,740 INFO L195 NwaCegarLoop]: trace histogram [99, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:41:27,747 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-11-22 02:41:27,947 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-22 02:41:27,947 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:41:27,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:41:27,947 INFO L85 PathProgramCache]: Analyzing trace with hash -997656454, now seen corresponding path program 9 times [2022-11-22 02:41:27,947 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:41:27,948 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1626762700] [2022-11-22 02:41:27,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:41:27,948 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:41:28,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:41:36,034 INFO L134 CoverageAnalysis]: Checked inductivity of 5203 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-22 02:41:36,034 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:41:36,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1626762700] [2022-11-22 02:41:36,034 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1626762700] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:41:36,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [802922722] [2022-11-22 02:41:36,035 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:41:36,035 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:41:36,035 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:41:36,036 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:41:36,038 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-22 02:41:36,676 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:41:36,676 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:41:36,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 1943 conjuncts, 101 conjunts are in the unsatisfiable core [2022-11-22 02:41:36,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:41:36,916 INFO L134 CoverageAnalysis]: Checked inductivity of 5203 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-22 02:41:36,917 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:41:48,884 INFO L134 CoverageAnalysis]: Checked inductivity of 5203 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-22 02:41:48,884 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [802922722] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:41:48,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [795748865] [2022-11-22 02:41:48,886 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:41:48,886 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:41:48,886 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:41:48,886 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:41:48,887 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:41:48,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:48,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:48,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:48,949 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-11-22 02:41:48,949 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 [2022-11-22 02:41:48,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:48,972 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:48,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:49,044 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-22 02:41:49,044 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 [2022-11-22 02:41:49,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:49,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:49,079 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 [2022-11-22 02:41:49,162 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:49,163 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:49,164 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:49,166 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:49,167 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:49,169 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:49,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:41:49,202 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-22 02:41:49,203 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 [2022-11-22 02:41:49,329 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:49,340 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-22 02:41:49,340 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 [2022-11-22 02:41:49,360 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:49,361 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:49,389 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-22 02:41:49,389 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 [2022-11-22 02:41:49,436 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:49,436 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:49,466 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-22 02:41:49,466 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 [2022-11-22 02:41:49,544 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:49,545 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:41:49,573 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-22 02:41:49,573 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 [2022-11-22 02:41:49,607 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-22 02:41:49,620 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:41:50,404 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 [2022-11-22 02:41:50,404 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:41:50,405 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:41:50,405 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101, 101] total 202 [2022-11-22 02:41:50,405 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840737282] [2022-11-22 02:41:50,405 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:41:50,406 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 203 states [2022-11-22 02:41:50,406 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:41:50,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 203 interpolants. [2022-11-22 02:41:50,416 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20528, Invalid=23782, Unknown=0, NotChecked=0, Total=44310 [2022-11-22 02:41:50,416 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) [2022-11-22 02:41:51,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:41:51,000 INFO L93 Difference]: Finished difference Result 276 states and 386 transitions. [2022-11-22 02:41:51,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 202 states. [2022-11-22 02:41:51,001 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 [2022-11-22 02:41:51,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:41:51,003 INFO L225 Difference]: With dead ends: 276 [2022-11-22 02:41:51,003 INFO L226 Difference]: Without dead ends: 239 [2022-11-22 02:41:51,007 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 280 SyntacticMatches, 0 SemanticMatches, 209 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2802 ImplicationChecksByTransitivity, 16.7s TimeCoverageRelationStatistics Valid=20528, Invalid=23782, Unknown=0, NotChecked=0, Total=44310 [2022-11-22 02:41:51,007 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 368 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:41:51,008 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 126 Invalid, 368 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 257 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:41:51,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2022-11-22 02:41:51,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 239. [2022-11-22 02:41:51,028 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) [2022-11-22 02:41:51,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 244 transitions. [2022-11-22 02:41:51,029 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 244 transitions. Word has length 130 [2022-11-22 02:41:51,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:41:51,030 INFO L495 AbstractCegarLoop]: Abstraction has 239 states and 244 transitions. [2022-11-22 02:41:51,030 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) [2022-11-22 02:41:51,030 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 244 transitions. [2022-11-22 02:41:51,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2022-11-22 02:41:51,034 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:41:51,034 INFO L195 NwaCegarLoop]: trace histogram [200, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:41:51,043 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-22 02:41:51,242 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-22 02:41:51,243 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:41:51,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:41:51,243 INFO L85 PathProgramCache]: Analyzing trace with hash -113899976, now seen corresponding path program 10 times [2022-11-22 02:41:51,243 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:41:51,243 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1186985794] [2022-11-22 02:41:51,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:41:51,244 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:41:51,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:42:19,802 INFO L134 CoverageAnalysis]: Checked inductivity of 20353 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-22 02:42:19,802 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:42:19,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1186985794] [2022-11-22 02:42:19,802 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1186985794] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:42:19,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [423397208] [2022-11-22 02:42:19,802 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:42:19,803 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:42:19,803 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:42:19,804 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:42:19,806 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-22 02:42:20,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:42:20,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 3660 conjuncts, 202 conjunts are in the unsatisfiable core [2022-11-22 02:42:20,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:42:21,326 INFO L134 CoverageAnalysis]: Checked inductivity of 20353 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-22 02:42:21,326 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:43:10,480 INFO L134 CoverageAnalysis]: Checked inductivity of 20353 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-22 02:43:10,481 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [423397208] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:43:10,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [947115664] [2022-11-22 02:43:10,482 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:43:10,483 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:43:10,483 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:43:10,483 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:43:10,483 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:43:10,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:43:10,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:43:10,506 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:43:10,578 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-22 02:43:10,578 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 [2022-11-22 02:43:10,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:43:10,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:43:10,596 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:43:10,597 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 [2022-11-22 02:43:10,620 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:43:10,621 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:43:10,623 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 [2022-11-22 02:43:10,697 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:43:10,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:43:10,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:43:10,700 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:43:10,701 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:43:10,704 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:43:10,704 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:43:10,738 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-22 02:43:10,738 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 [2022-11-22 02:43:10,820 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:43:10,832 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-22 02:43:10,833 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 [2022-11-22 02:43:10,880 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-11-22 02:43:10,880 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 [2022-11-22 02:43:10,921 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:43:10,922 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:43:10,951 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-22 02:43:10,951 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 [2022-11-22 02:43:10,982 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-22 02:43:10,996 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:43:12,499 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 [2022-11-22 02:43:12,499 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:43:12,499 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:43:12,499 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [202, 202, 202] total 404 [2022-11-22 02:43:12,500 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426446219] [2022-11-22 02:43:12,500 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:43:12,500 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 405 states [2022-11-22 02:43:12,501 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:43:12,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 405 interpolants. [2022-11-22 02:43:12,521 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81835, Invalid=88321, Unknown=0, NotChecked=0, Total=170156 [2022-11-22 02:43:12,522 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) [2022-11-22 02:43:15,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:43:15,121 INFO L93 Difference]: Finished difference Result 478 states and 689 transitions. [2022-11-22 02:43:15,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 404 states. [2022-11-22 02:43:15,122 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 [2022-11-22 02:43:15,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:43:15,125 INFO L225 Difference]: With dead ends: 478 [2022-11-22 02:43:15,125 INFO L226 Difference]: Without dead ends: 441 [2022-11-22 02:43:15,133 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 893 GetRequests, 482 SyntacticMatches, 0 SemanticMatches, 411 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5630 ImplicationChecksByTransitivity, 66.7s TimeCoverageRelationStatistics Valid=81835, Invalid=88321, Unknown=0, NotChecked=0, Total=170156 [2022-11-22 02:43:15,134 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 440 mSolverCounterSat, 212 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 652 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 212 IncrementalHoareTripleChecker+Valid, 440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:43:15,134 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 84 Invalid, 652 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [212 Valid, 440 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 02:43:15,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2022-11-22 02:43:15,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 441. [2022-11-22 02:43:15,164 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) [2022-11-22 02:43:15,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 446 transitions. [2022-11-22 02:43:15,166 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 446 transitions. Word has length 231 [2022-11-22 02:43:15,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:43:15,167 INFO L495 AbstractCegarLoop]: Abstraction has 441 states and 446 transitions. [2022-11-22 02:43:15,168 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) [2022-11-22 02:43:15,168 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 446 transitions. [2022-11-22 02:43:15,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 434 [2022-11-22 02:43:15,176 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:43:15,177 INFO L195 NwaCegarLoop]: trace histogram [402, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:43:15,197 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-22 02:43:15,387 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:43:15,387 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:43:15,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:43:15,387 INFO L85 PathProgramCache]: Analyzing trace with hash -1510019208, now seen corresponding path program 11 times [2022-11-22 02:43:15,387 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:43:15,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [988525868] [2022-11-22 02:43:15,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:43:15,388 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:43:17,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:45:10,454 INFO L134 CoverageAnalysis]: Checked inductivity of 81256 backedges. 0 proven. 81003 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-22 02:45:10,454 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:45:10,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [988525868] [2022-11-22 02:45:10,454 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [988525868] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:45:10,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1810570056] [2022-11-22 02:45:10,455 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:45:10,455 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:45:10,455 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:45:10,463 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:45:10,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-22 02:46:03,127 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-22 02:46:03,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:46:03,157 INFO L263 TraceCheckSpWp]: Trace formula consists of 634 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-22 02:46:03,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:46:07,739 INFO L134 CoverageAnalysis]: Checked inductivity of 81256 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 81003 trivial. 0 not checked. [2022-11-22 02:46:07,739 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:46:12,873 INFO L134 CoverageAnalysis]: Checked inductivity of 81256 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 81003 trivial. 0 not checked. [2022-11-22 02:46:12,873 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1810570056] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:46:12,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1966332443] [2022-11-22 02:46:12,875 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:46:12,875 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:46:12,876 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:46:12,876 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:46:12,876 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:46:12,890 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:46:12,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:46:12,892 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:46:12,941 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-11-22 02:46:12,941 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 [2022-11-22 02:46:12,957 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:46:12,960 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:46:12,961 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:46:13,019 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-22 02:46:13,019 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 [2022-11-22 02:46:13,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:46:13,052 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:46:13,054 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 [2022-11-22 02:46:13,157 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:46:13,158 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:46:13,159 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:46:13,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:46:13,161 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:46:13,163 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:46:13,164 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:46:13,198 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-22 02:46:13,199 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 [2022-11-22 02:46:13,280 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:46:13,292 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-22 02:46:13,292 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 [2022-11-22 02:46:13,312 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:46:13,312 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:46:13,340 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-22 02:46:13,341 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 [2022-11-22 02:46:13,386 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:46:13,387 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:46:13,423 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-22 02:46:13,423 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 [2022-11-22 02:46:13,455 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-22 02:46:13,468 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:46:16,430 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 [2022-11-22 02:46:16,430 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:46:16,431 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:46:16,431 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [404, 24, 24] total 450 [2022-11-22 02:46:16,431 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1877954318] [2022-11-22 02:46:16,431 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:46:16,433 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 451 states [2022-11-22 02:46:16,433 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:46:16,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 451 interpolants. [2022-11-22 02:46:16,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83008, Invalid=127214, Unknown=0, NotChecked=0, Total=210222 [2022-11-22 02:46:16,458 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) [2022-11-22 02:47:47,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:47:47,658 INFO L93 Difference]: Finished difference Result 503 states and 537 transitions. [2022-11-22 02:47:47,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 451 states. [2022-11-22 02:47:47,659 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 [2022-11-22 02:47:47,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:47:47,663 INFO L225 Difference]: With dead ends: 503 [2022-11-22 02:47:47,663 INFO L226 Difference]: Without dead ends: 466 [2022-11-22 02:47:47,729 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2104 GetRequests, 1244 SyntacticMatches, 0 SemanticMatches, 860 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104894 ImplicationChecksByTransitivity, 154.2s TimeCoverageRelationStatistics Valid=264761, Invalid=477421, Unknown=0, NotChecked=0, Total=742182 [2022-11-22 02:47:47,730 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 2025 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 505 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2025 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 537 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 505 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-22 02:47:47,730 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2025 Valid, 140 Invalid, 537 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 505 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-22 02:47:47,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2022-11-22 02:47:47,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 466. [2022-11-22 02:47:47,767 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) [2022-11-22 02:47:47,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 471 transitions. [2022-11-22 02:47:47,770 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 471 transitions. Word has length 433 [2022-11-22 02:47:47,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:47:47,771 INFO L495 AbstractCegarLoop]: Abstraction has 466 states and 471 transitions. [2022-11-22 02:47:47,772 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) [2022-11-22 02:47:47,772 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 471 transitions. [2022-11-22 02:47:47,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 459 [2022-11-22 02:47:47,785 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:47:47,785 INFO L195 NwaCegarLoop]: trace histogram [403, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:47:47,828 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-22 02:47:48,010 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-22 02:47:48,011 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:47:48,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:47:48,011 INFO L85 PathProgramCache]: Analyzing trace with hash 497319930, now seen corresponding path program 12 times [2022-11-22 02:47:48,011 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:47:48,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1947735530] [2022-11-22 02:47:48,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:47:48,012 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:47:49,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:49:59,396 INFO L134 CoverageAnalysis]: Checked inductivity of 82487 backedges. 0 proven. 81406 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2022-11-22 02:49:59,396 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:49:59,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1947735530] [2022-11-22 02:49:59,396 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1947735530] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:49:59,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1791206311] [2022-11-22 02:49:59,397 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:49:59,397 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:49:59,397 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:49:59,399 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:49:59,400 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-22 02:50:01,773 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:50:01,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:50:01,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 7303 conjuncts, 405 conjunts are in the unsatisfiable core [2022-11-22 02:50:01,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:50:02,555 INFO L134 CoverageAnalysis]: Checked inductivity of 82487 backedges. 0 proven. 81406 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2022-11-22 02:50:02,555 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:53:20,318 INFO L134 CoverageAnalysis]: Checked inductivity of 82487 backedges. 0 proven. 81406 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2022-11-22 02:53:20,318 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1791206311] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:53:20,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [806919022] [2022-11-22 02:53:20,320 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:53:20,320 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:53:20,320 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:53:20,321 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:53:20,321 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:53:20,335 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:53:20,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:53:20,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:53:20,384 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-11-22 02:53:20,385 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 [2022-11-22 02:53:20,406 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:53:20,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:53:20,411 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:53:20,467 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-22 02:53:20,467 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 [2022-11-22 02:53:20,506 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:53:20,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:53:20,508 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 [2022-11-22 02:53:20,577 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:53:20,578 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:53:20,581 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:53:20,582 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:53:20,582 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:53:20,645 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-11-22 02:53:20,645 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 [2022-11-22 02:53:20,921 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:53:20,932 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-22 02:53:20,933 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 [2022-11-22 02:53:20,977 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-11-22 02:53:20,977 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 [2022-11-22 02:53:21,016 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:53:21,017 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:53:21,045 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-22 02:53:21,045 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 [2022-11-22 02:53:21,109 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:53:21,109 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:53:21,138 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-22 02:53:21,138 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 [2022-11-22 02:53:21,298 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-22 02:53:21,309 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:53:23,922 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 [2022-11-22 02:53:23,922 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:53:23,922 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:53:23,922 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [405, 405, 405] total 810 [2022-11-22 02:53:23,923 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1439163802] [2022-11-22 02:53:23,923 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:53:23,925 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 811 states [2022-11-22 02:53:23,925 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:53:23,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 811 interpolants. [2022-11-22 02:53:24,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=328480, Invalid=341462, Unknown=0, NotChecked=0, Total=669942 [2022-11-22 02:53:24,024 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) [2022-11-22 02:53:44,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:53:44,821 INFO L93 Difference]: Finished difference Result 932 states and 1346 transitions. [2022-11-22 02:53:44,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 810 states. [2022-11-22 02:53:44,823 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 [2022-11-22 02:53:44,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:53:44,827 INFO L225 Difference]: With dead ends: 932 [2022-11-22 02:53:44,827 INFO L226 Difference]: Without dead ends: 871 [2022-11-22 02:53:44,864 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1777 GetRequests, 960 SyntacticMatches, 0 SemanticMatches, 817 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11314 ImplicationChecksByTransitivity, 266.5s TimeCoverageRelationStatistics Valid=328480, Invalid=341462, Unknown=0, NotChecked=0, Total=669942 [2022-11-22 02:53:44,865 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 840 mSolverCounterSat, 411 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 1251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 411 IncrementalHoareTripleChecker+Valid, 840 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-22 02:53:44,865 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 70 Invalid, 1251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [411 Valid, 840 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-22 02:53:44,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 871 states. [2022-11-22 02:53:44,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 871 to 871. [2022-11-22 02:53:44,912 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) [2022-11-22 02:53:44,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 871 states to 871 states and 876 transitions. [2022-11-22 02:53:44,916 INFO L78 Accepts]: Start accepts. Automaton has 871 states and 876 transitions. Word has length 458 [2022-11-22 02:53:44,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:53:44,916 INFO L495 AbstractCegarLoop]: Abstraction has 871 states and 876 transitions. [2022-11-22 02:53:44,917 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) [2022-11-22 02:53:44,918 INFO L276 IsEmpty]: Start isEmpty. Operand 871 states and 876 transitions. [2022-11-22 02:53:44,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 864 [2022-11-22 02:53:44,926 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:53:44,926 INFO L195 NwaCegarLoop]: trace histogram [808, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:53:44,949 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-11-22 02:53:45,139 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e60bd560-cd2e-49df-8fd2-836d100a45f0/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-22 02:53:45,139 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:53:45,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:53:45,139 INFO L85 PathProgramCache]: Analyzing trace with hash 2003805624, now seen corresponding path program 13 times [2022-11-22 02:53:45,139 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:53:45,140 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1464619386] [2022-11-22 02:53:45,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:53:45,140 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:53:49,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat