./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/sorting_selectionsort_2_ground.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/sorting_selectionsort_2_ground.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash cae1888d2d961d86748cda3b827a90e6d152bf2b6038710fc1a5581289f20b0c --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 05:30:50,145 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 05:30:50,147 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 05:30:50,165 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 05:30:50,166 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 05:30:50,167 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 05:30:50,168 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 05:30:50,170 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 05:30:50,171 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 05:30:50,172 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 05:30:50,173 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 05:30:50,174 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 05:30:50,174 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 05:30:50,175 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 05:30:50,177 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 05:30:50,178 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 05:30:50,179 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 05:30:50,179 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 05:30:50,181 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 05:30:50,183 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 05:30:50,184 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 05:30:50,186 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 05:30:50,187 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 05:30:50,188 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 05:30:50,191 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 05:30:50,192 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 05:30:50,192 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 05:30:50,193 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 05:30:50,193 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 05:30:50,194 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 05:30:50,195 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 05:30:50,195 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 05:30:50,196 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 05:30:50,197 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 05:30:50,198 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 05:30:50,198 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 05:30:50,199 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 05:30:50,199 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 05:30:50,199 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 05:30:50,200 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 05:30:50,201 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 05:30:50,201 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 05:30:50,220 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 05:30:50,220 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 05:30:50,220 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 05:30:50,220 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 05:30:50,221 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 05:30:50,221 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 05:30:50,221 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 05:30:50,221 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 05:30:50,221 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 05:30:50,221 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 05:30:50,221 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 05:30:50,221 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 05:30:50,222 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 05:30:50,222 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 05:30:50,222 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 05:30:50,222 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 05:30:50,222 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 05:30:50,222 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 05:30:50,223 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 05:30:50,223 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 05:30:50,223 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 05:30:50,223 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 05:30:50,223 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 05:30:50,223 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 05:30:50,223 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 05:30:50,223 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 05:30:50,224 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 05:30:50,224 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 05:30:50,224 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 05:30:50,224 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 05:30:50,224 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 05:30:50,224 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 05:30:50,224 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 05:30:50,224 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 05:30:50,225 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 05:30:50,225 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 05:30:50,225 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 05:30:50,225 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 05:30:50,225 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 05:30:50,225 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 05:30:50,225 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 05:30:50,225 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_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cae1888d2d961d86748cda3b827a90e6d152bf2b6038710fc1a5581289f20b0c [2022-12-14 05:30:50,446 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 05:30:50,462 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 05:30:50,464 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 05:30:50,465 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 05:30:50,465 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 05:30:50,466 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/array-examples/sorting_selectionsort_2_ground.i [2022-12-14 05:30:53,064 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 05:30:53,199 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 05:30:53,199 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/sv-benchmarks/c/array-examples/sorting_selectionsort_2_ground.i [2022-12-14 05:30:53,204 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/data/0ad19e7b0/123cb6418ad8437ab1c1ac5b1e2994d1/FLAG150fb9a7a [2022-12-14 05:30:53,220 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/data/0ad19e7b0/123cb6418ad8437ab1c1ac5b1e2994d1 [2022-12-14 05:30:53,222 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 05:30:53,222 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 05:30:53,223 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 05:30:53,224 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 05:30:53,226 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 05:30:53,226 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 05:30:53" (1/1) ... [2022-12-14 05:30:53,227 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6d99d60a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:30:53, skipping insertion in model container [2022-12-14 05:30:53,227 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 05:30:53" (1/1) ... [2022-12-14 05:30:53,232 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 05:30:53,246 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 05:30:53,362 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_cb415f44-6875-4c2b-b981-d7abdc381886/sv-benchmarks/c/array-examples/sorting_selectionsort_2_ground.i[823,836] [2022-12-14 05:30:53,379 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 05:30:53,387 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 05:30:53,398 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_cb415f44-6875-4c2b-b981-d7abdc381886/sv-benchmarks/c/array-examples/sorting_selectionsort_2_ground.i[823,836] [2022-12-14 05:30:53,410 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 05:30:53,422 INFO L208 MainTranslator]: Completed translation [2022-12-14 05:30:53,423 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:30:53 WrapperNode [2022-12-14 05:30:53,423 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 05:30:53,424 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 05:30:53,424 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 05:30:53,425 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 05:30:53,431 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:30:53" (1/1) ... [2022-12-14 05:30:53,438 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:30:53" (1/1) ... [2022-12-14 05:30:53,458 INFO L138 Inliner]: procedures = 16, calls = 25, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 114 [2022-12-14 05:30:53,459 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 05:30:53,459 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 05:30:53,460 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 05:30:53,460 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 05:30:53,467 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:30:53" (1/1) ... [2022-12-14 05:30:53,468 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:30:53" (1/1) ... [2022-12-14 05:30:53,470 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:30:53" (1/1) ... [2022-12-14 05:30:53,470 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:30:53" (1/1) ... [2022-12-14 05:30:53,476 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:30:53" (1/1) ... [2022-12-14 05:30:53,480 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:30:53" (1/1) ... [2022-12-14 05:30:53,481 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:30:53" (1/1) ... [2022-12-14 05:30:53,482 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:30:53" (1/1) ... [2022-12-14 05:30:53,484 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 05:30:53,485 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 05:30:53,485 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 05:30:53,485 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 05:30:53,486 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:30:53" (1/1) ... [2022-12-14 05:30:53,492 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 05:30:53,500 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:30:53,514 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 05:30:53,516 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 05:30:53,551 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 05:30:53,551 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 05:30:53,551 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-12-14 05:30:53,551 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-12-14 05:30:53,551 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 05:30:53,551 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 05:30:53,552 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-12-14 05:30:53,552 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-12-14 05:30:53,552 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-12-14 05:30:53,552 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-12-14 05:30:53,616 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 05:30:53,618 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 05:30:53,760 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 05:30:53,814 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 05:30:53,814 INFO L300 CfgBuilder]: Removed 8 assume(true) statements. [2022-12-14 05:30:53,816 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 05:30:53 BoogieIcfgContainer [2022-12-14 05:30:53,816 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 05:30:53,818 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 05:30:53,818 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 05:30:53,821 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 05:30:53,821 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 05:30:53" (1/3) ... [2022-12-14 05:30:53,821 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6b881b4d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 05:30:53, skipping insertion in model container [2022-12-14 05:30:53,822 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:30:53" (2/3) ... [2022-12-14 05:30:53,822 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6b881b4d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 05:30:53, skipping insertion in model container [2022-12-14 05:30:53,822 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 05:30:53" (3/3) ... [2022-12-14 05:30:53,823 INFO L112 eAbstractionObserver]: Analyzing ICFG sorting_selectionsort_2_ground.i [2022-12-14 05:30:53,837 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 05:30:53,838 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 05:30:53,874 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 05:30:53,879 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;@388d411e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 05:30:53,879 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 05:30:53,882 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 16 states have (on average 1.625) internal successors, (26), 17 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-12-14 05:30:53,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-12-14 05:30:53,888 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:30:53,888 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:30:53,888 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:30:53,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:30:53,893 INFO L85 PathProgramCache]: Analyzing trace with hash 2132052571, now seen corresponding path program 1 times [2022-12-14 05:30:53,900 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:30:53,900 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922754105] [2022-12-14 05:30:53,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:30:53,901 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:30:53,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:30:54,038 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 05:30:54,038 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:30:54,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922754105] [2022-12-14 05:30:54,039 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [922754105] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 05:30:54,039 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 05:30:54,039 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 05:30:54,040 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094844986] [2022-12-14 05:30:54,041 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 05:30:54,045 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 05:30:54,045 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:30:54,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 05:30:54,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 05:30:54,075 INFO L87 Difference]: Start difference. First operand has 22 states, 16 states have (on average 1.625) internal successors, (26), 17 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 05:30:54,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:30:54,153 INFO L93 Difference]: Finished difference Result 52 states and 84 transitions. [2022-12-14 05:30:54,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 05:30:54,155 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-12-14 05:30:54,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:30:54,160 INFO L225 Difference]: With dead ends: 52 [2022-12-14 05:30:54,161 INFO L226 Difference]: Without dead ends: 31 [2022-12-14 05:30:54,163 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 05:30:54,166 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 10 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 05:30:54,166 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 28 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 05:30:54,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-12-14 05:30:54,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 23. [2022-12-14 05:30:54,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 18 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-12-14 05:30:54,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 32 transitions. [2022-12-14 05:30:54,197 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 32 transitions. Word has length 9 [2022-12-14 05:30:54,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:30:54,197 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 32 transitions. [2022-12-14 05:30:54,198 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 05:30:54,198 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 32 transitions. [2022-12-14 05:30:54,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-12-14 05:30:54,198 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:30:54,198 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:30:54,199 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 05:30:54,199 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:30:54,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:30:54,200 INFO L85 PathProgramCache]: Analyzing trace with hash -353696715, now seen corresponding path program 1 times [2022-12-14 05:30:54,200 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:30:54,200 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2084175989] [2022-12-14 05:30:54,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:30:54,200 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:30:54,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:30:54,264 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 05:30:54,265 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:30:54,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2084175989] [2022-12-14 05:30:54,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2084175989] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 05:30:54,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1362907023] [2022-12-14 05:30:54,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:30:54,266 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:30:54,266 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:30:54,267 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:30:54,268 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 05:30:54,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:30:54,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 3 conjunts are in the unsatisfiable core [2022-12-14 05:30:54,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:30:54,359 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 05:30:54,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:30:54,378 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 05:30:54,378 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1362907023] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:30:54,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [106051226] [2022-12-14 05:30:54,397 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 05:30:54,398 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:30:54,401 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:30:54,406 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:30:54,406 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:30:54,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:54,480 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-12-14 05:30:54,481 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-12-14 05:30:54,493 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:54,509 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 05:30:54,509 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 05:30:54,556 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:54,557 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 05:30:54,688 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:54,690 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 05:30:54,711 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 05:30:54,712 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2022-12-14 05:30:54,810 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 05:30:54,830 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-12-14 05:30:54,831 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:30:54,867 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [106051226] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 05:30:54,867 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-12-14 05:30:54,867 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 3, 3] total 9 [2022-12-14 05:30:54,868 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804453572] [2022-12-14 05:30:54,869 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 05:30:54,869 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 05:30:54,869 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:30:54,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 05:30:54,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=50, Unknown=0, NotChecked=0, Total=90 [2022-12-14 05:30:54,871 INFO L87 Difference]: Start difference. First operand 23 states and 32 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 05:30:54,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:30:54,957 INFO L93 Difference]: Finished difference Result 51 states and 75 transitions. [2022-12-14 05:30:54,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 05:30:54,958 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-12-14 05:30:54,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:30:54,959 INFO L225 Difference]: With dead ends: 51 [2022-12-14 05:30:54,959 INFO L226 Difference]: Without dead ends: 32 [2022-12-14 05:30:54,959 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=50, Unknown=0, NotChecked=0, Total=90 [2022-12-14 05:30:54,960 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 35 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 05:30:54,961 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 20 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 05:30:54,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-12-14 05:30:54,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2022-12-14 05:30:54,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 19 states have internal predecessors, (27), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-12-14 05:30:54,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 33 transitions. [2022-12-14 05:30:54,970 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 33 transitions. Word has length 11 [2022-12-14 05:30:54,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:30:54,970 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 33 transitions. [2022-12-14 05:30:54,970 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 05:30:54,970 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 33 transitions. [2022-12-14 05:30:54,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-12-14 05:30:54,971 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:30:54,971 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:30:54,976 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 05:30:55,171 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:30:55,172 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:30:55,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:30:55,172 INFO L85 PathProgramCache]: Analyzing trace with hash 777080389, now seen corresponding path program 1 times [2022-12-14 05:30:55,173 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:30:55,173 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [375090506] [2022-12-14 05:30:55,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:30:55,173 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:30:55,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:30:55,245 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 05:30:55,245 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:30:55,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [375090506] [2022-12-14 05:30:55,245 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [375090506] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 05:30:55,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2012508104] [2022-12-14 05:30:55,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:30:55,246 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:30:55,246 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:30:55,247 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:30:55,248 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 05:30:55,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:30:55,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 3 conjunts are in the unsatisfiable core [2022-12-14 05:30:55,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:30:55,303 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 05:30:55,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:30:55,316 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 05:30:55,316 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2012508104] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:30:55,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2105544822] [2022-12-14 05:30:55,319 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 05:30:55,319 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:30:55,319 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:30:55,320 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:30:55,320 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:30:55,332 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:55,341 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-12-14 05:30:55,341 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-12-14 05:30:55,349 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:55,363 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 05:30:55,363 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 05:30:55,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:55,384 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 05:30:55,433 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:55,434 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 05:30:55,453 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 05:30:55,453 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2022-12-14 05:30:55,527 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 05:30:55,586 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:55,587 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-12-14 05:30:55,608 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-12-14 05:30:55,623 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:30:55,822 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '413#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1| Int)) (and (= (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_~#a~0#1.base_BEFORE_CALL_1|) 4)) 1 0) |__VERIFIER_assert_#in~cond|) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 05:30:55,822 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:30:55,822 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 05:30:55,822 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2022-12-14 05:30:55,823 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911081870] [2022-12-14 05:30:55,823 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 05:30:55,823 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-12-14 05:30:55,823 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:30:55,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-12-14 05:30:55,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=160, Unknown=0, NotChecked=0, Total=240 [2022-12-14 05:30:55,824 INFO L87 Difference]: Start difference. First operand 24 states and 33 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 05:30:55,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:30:55,921 INFO L93 Difference]: Finished difference Result 75 states and 116 transitions. [2022-12-14 05:30:55,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 05:30:55,921 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 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 12 [2022-12-14 05:30:55,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:30:55,923 INFO L225 Difference]: With dead ends: 75 [2022-12-14 05:30:55,923 INFO L226 Difference]: Without dead ends: 54 [2022-12-14 05:30:55,923 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=80, Invalid=160, Unknown=0, NotChecked=0, Total=240 [2022-12-14 05:30:55,924 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 87 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 05:30:55,924 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [95 Valid, 30 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 05:30:55,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-12-14 05:30:55,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2022-12-14 05:30:55,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 43 states have (on average 1.4651162790697674) internal successors, (63), 43 states have internal predecessors, (63), 9 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-12-14 05:30:55,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 81 transitions. [2022-12-14 05:30:55,933 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 81 transitions. Word has length 12 [2022-12-14 05:30:55,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:30:55,933 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 81 transitions. [2022-12-14 05:30:55,933 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 05:30:55,933 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 81 transitions. [2022-12-14 05:30:55,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-12-14 05:30:55,934 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:30:55,934 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:30:55,938 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 05:30:56,134 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:30:56,135 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:30:56,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:30:56,135 INFO L85 PathProgramCache]: Analyzing trace with hash -1355145570, now seen corresponding path program 2 times [2022-12-14 05:30:56,135 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:30:56,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1679887928] [2022-12-14 05:30:56,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:30:56,135 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:30:56,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:30:56,234 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 05:30:56,235 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:30:56,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1679887928] [2022-12-14 05:30:56,235 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1679887928] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 05:30:56,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [109379812] [2022-12-14 05:30:56,235 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 05:30:56,236 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:30:56,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:30:56,237 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:30:56,238 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 05:30:56,279 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 05:30:56,279 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 05:30:56,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 05:30:56,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:30:56,294 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 05:30:56,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:30:56,313 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 05:30:56,313 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [109379812] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:30:56,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1630937526] [2022-12-14 05:30:56,315 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 05:30:56,315 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:30:56,316 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:30:56,316 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:30:56,316 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:30:56,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:56,338 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 05:30:56,338 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 05:30:56,345 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:56,346 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-12-14 05:30:56,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:56,365 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 05:30:56,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:56,398 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:56,406 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 05:30:56,407 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2022-12-14 05:30:56,438 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 05:30:56,478 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:56,479 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-12-14 05:30:56,493 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-12-14 05:30:56,504 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:30:56,713 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '736#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (exists ((|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_2| Int)) (and (= |__VERIFIER_assert_#in~cond| (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_~#a~0#1.base_BEFORE_CALL_2|) 4)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_2|))) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 05:30:56,713 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:30:56,713 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 05:30:56,713 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2022-12-14 05:30:56,714 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [449930259] [2022-12-14 05:30:56,714 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 05:30:56,714 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-12-14 05:30:56,714 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:30:56,715 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-12-14 05:30:56,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=263, Unknown=0, NotChecked=0, Total=342 [2022-12-14 05:30:56,715 INFO L87 Difference]: Start difference. First operand 54 states and 81 transitions. Second operand has 10 states, 10 states have (on average 1.8) internal successors, (18), 10 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 05:30:56,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:30:56,846 INFO L93 Difference]: Finished difference Result 106 states and 165 transitions. [2022-12-14 05:30:56,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 05:30:56,847 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 10 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-12-14 05:30:56,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:30:56,847 INFO L225 Difference]: With dead ends: 106 [2022-12-14 05:30:56,848 INFO L226 Difference]: Without dead ends: 61 [2022-12-14 05:30:56,848 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=133, Invalid=467, Unknown=0, NotChecked=0, Total=600 [2022-12-14 05:30:56,849 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 26 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 05:30:56,849 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 77 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 05:30:56,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-12-14 05:30:56,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2022-12-14 05:30:56,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 50 states have (on average 1.4) internal successors, (70), 50 states have internal predecessors, (70), 9 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-12-14 05:30:56,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 88 transitions. [2022-12-14 05:30:56,860 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 88 transitions. Word has length 15 [2022-12-14 05:30:56,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:30:56,860 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 88 transitions. [2022-12-14 05:30:56,861 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 10 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 05:30:56,861 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 88 transitions. [2022-12-14 05:30:56,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-12-14 05:30:56,861 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:30:56,861 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:30:56,867 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 05:30:57,062 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2022-12-14 05:30:57,064 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:30:57,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:30:57,065 INFO L85 PathProgramCache]: Analyzing trace with hash 201502012, now seen corresponding path program 3 times [2022-12-14 05:30:57,066 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:30:57,066 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1184845946] [2022-12-14 05:30:57,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:30:57,067 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:30:57,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:30:57,251 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 05:30:57,252 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:30:57,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1184845946] [2022-12-14 05:30:57,252 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1184845946] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 05:30:57,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1657235388] [2022-12-14 05:30:57,252 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 05:30:57,252 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:30:57,252 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:30:57,253 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:30:57,254 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 05:30:57,302 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 05:30:57,302 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 05:30:57,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 6 conjunts are in the unsatisfiable core [2022-12-14 05:30:57,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:30:57,313 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 05:30:57,313 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:30:57,344 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 05:30:57,344 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1657235388] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:30:57,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1610749377] [2022-12-14 05:30:57,346 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 05:30:57,346 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:30:57,347 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:30:57,347 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:30:57,347 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:30:57,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:57,365 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 05:30:57,365 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 05:30:57,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:57,372 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-12-14 05:30:57,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:57,384 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 05:30:57,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:57,414 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 05:30:57,428 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 05:30:57,429 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2022-12-14 05:30:57,494 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 05:30:57,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:57,537 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-12-14 05:30:57,548 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-12-14 05:30:57,557 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:30:57,736 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1162#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_3| Int)) (and (= (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_~#a~0#1.base_BEFORE_CALL_3|) 4)) 1 0) |__VERIFIER_assert_#in~cond|) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_3|))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 05:30:57,736 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:30:57,736 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 05:30:57,736 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2022-12-14 05:30:57,737 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399846384] [2022-12-14 05:30:57,737 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 05:30:57,737 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-14 05:30:57,737 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:30:57,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-14 05:30:57,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=295, Unknown=0, NotChecked=0, Total=462 [2022-12-14 05:30:57,738 INFO L87 Difference]: Start difference. First operand 61 states and 88 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 05:30:57,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:30:57,928 INFO L93 Difference]: Finished difference Result 182 states and 283 transitions. [2022-12-14 05:30:57,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 05:30:57,928 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2022-12-14 05:30:57,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:30:57,929 INFO L225 Difference]: With dead ends: 182 [2022-12-14 05:30:57,929 INFO L226 Difference]: Without dead ends: 127 [2022-12-14 05:30:57,930 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=167, Invalid=295, Unknown=0, NotChecked=0, Total=462 [2022-12-14 05:30:57,931 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 232 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 252 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 05:30:57,931 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [252 Valid, 53 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 171 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 05:30:57,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2022-12-14 05:30:57,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2022-12-14 05:30:57,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 104 states have (on average 1.4230769230769231) internal successors, (148), 104 states have internal predecessors, (148), 21 states have call successors, (21), 1 states have call predecessors, (21), 1 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2022-12-14 05:30:57,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 190 transitions. [2022-12-14 05:30:57,960 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 190 transitions. Word has length 18 [2022-12-14 05:30:57,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:30:57,960 INFO L495 AbstractCegarLoop]: Abstraction has 127 states and 190 transitions. [2022-12-14 05:30:57,960 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 05:30:57,960 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 190 transitions. [2022-12-14 05:30:57,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-12-14 05:30:57,961 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:30:57,961 INFO L195 NwaCegarLoop]: trace histogram [10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:30:57,966 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 05:30:58,162 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:30:58,163 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:30:58,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:30:58,164 INFO L85 PathProgramCache]: Analyzing trace with hash 1352899228, now seen corresponding path program 4 times [2022-12-14 05:30:58,164 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:30:58,165 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1971256609] [2022-12-14 05:30:58,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:30:58,166 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:30:58,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:30:58,466 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 05:30:58,466 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:30:58,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1971256609] [2022-12-14 05:30:58,466 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1971256609] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 05:30:58,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [448178801] [2022-12-14 05:30:58,466 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 05:30:58,466 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:30:58,467 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:30:58,467 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:30:58,468 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 05:30:58,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:30:58,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 05:30:58,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:30:58,543 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 05:30:58,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:30:58,684 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 05:30:58,684 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [448178801] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:30:58,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1601264613] [2022-12-14 05:30:58,686 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 05:30:58,686 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:30:58,686 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:30:58,687 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:30:58,687 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:30:58,697 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:58,706 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-12-14 05:30:58,706 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-12-14 05:30:58,713 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:58,724 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 05:30:58,724 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 05:30:58,737 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:58,738 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 05:30:58,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:58,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:58,782 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 05:30:58,782 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2022-12-14 05:30:58,809 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 05:30:58,843 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:30:58,844 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-12-14 05:30:58,855 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-12-14 05:30:58,864 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:30:59,019 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1884#(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_4| Int)) (and (= |__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_~#a~0#1.base_BEFORE_CALL_4|) 4)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_4|))) (= |#NULL.base| 0))' at error location [2022-12-14 05:30:59,019 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:30:59,019 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 05:30:59,019 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2022-12-14 05:30:59,020 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [486947365] [2022-12-14 05:30:59,020 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 05:30:59,020 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 05:30:59,020 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:30:59,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 05:30:59,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=449, Invalid=673, Unknown=0, NotChecked=0, Total=1122 [2022-12-14 05:30:59,021 INFO L87 Difference]: Start difference. First operand 127 states and 190 transitions. Second operand has 25 states, 25 states have (on average 1.36) internal successors, (34), 24 states have internal predecessors, (34), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 05:30:59,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:30:59,407 INFO L93 Difference]: Finished difference Result 374 states and 595 transitions. [2022-12-14 05:30:59,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-12-14 05:30:59,407 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.36) internal successors, (34), 24 states have internal predecessors, (34), 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 24 [2022-12-14 05:30:59,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:30:59,409 INFO L225 Difference]: With dead ends: 374 [2022-12-14 05:30:59,409 INFO L226 Difference]: Without dead ends: 259 [2022-12-14 05:30:59,410 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 402 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=449, Invalid=673, Unknown=0, NotChecked=0, Total=1122 [2022-12-14 05:30:59,411 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 590 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 402 mSolverCounterSat, 162 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 634 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 564 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 162 IncrementalHoareTripleChecker+Valid, 402 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 05:30:59,411 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [634 Valid, 88 Invalid, 564 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [162 Valid, 402 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 05:30:59,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2022-12-14 05:30:59,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 259. [2022-12-14 05:30:59,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 212 states have (on average 1.4339622641509433) internal successors, (304), 212 states have internal predecessors, (304), 45 states have call successors, (45), 1 states have call predecessors, (45), 1 states have return successors, (45), 45 states have call predecessors, (45), 45 states have call successors, (45) [2022-12-14 05:30:59,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 394 transitions. [2022-12-14 05:30:59,442 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 394 transitions. Word has length 24 [2022-12-14 05:30:59,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:30:59,442 INFO L495 AbstractCegarLoop]: Abstraction has 259 states and 394 transitions. [2022-12-14 05:30:59,442 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.36) internal successors, (34), 24 states have internal predecessors, (34), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 05:30:59,442 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 394 transitions. [2022-12-14 05:30:59,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-12-14 05:30:59,442 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:30:59,442 INFO L195 NwaCegarLoop]: trace histogram [22, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:30:59,447 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 05:30:59,643 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:30:59,643 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:30:59,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:30:59,645 INFO L85 PathProgramCache]: Analyzing trace with hash -1422074532, now seen corresponding path program 5 times [2022-12-14 05:30:59,645 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:30:59,646 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1486651037] [2022-12-14 05:30:59,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:30:59,647 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:30:59,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:31:00,149 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 05:31:00,149 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:31:00,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1486651037] [2022-12-14 05:31:00,150 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1486651037] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 05:31:00,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [887655457] [2022-12-14 05:31:00,150 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 05:31:00,150 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:31:00,150 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:31:00,151 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:31:00,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 05:31:00,210 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 05:31:00,211 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 05:31:00,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 7 conjunts are in the unsatisfiable core [2022-12-14 05:31:00,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:31:00,274 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-12-14 05:31:00,274 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:31:00,351 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-12-14 05:31:00,351 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [887655457] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:31:00,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1156571557] [2022-12-14 05:31:00,352 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 05:31:00,352 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:31:00,352 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:31:00,352 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:31:00,352 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:31:00,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:31:00,366 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-12-14 05:31:00,366 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-12-14 05:31:00,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:31:00,385 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 05:31:00,385 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 05:31:00,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:31:00,398 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 05:31:00,426 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:31:00,427 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 05:31:00,444 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 05:31:00,445 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2022-12-14 05:31:00,492 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 05:31:00,531 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:31:00,532 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-12-14 05:31:00,544 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-12-14 05:31:00,554 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:31:00,759 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3278#(and (exists ((|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_5| Int)) (and (= |__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_~#a~0#1.base_BEFORE_CALL_5|) 4)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_5|))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 05:31:00,759 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:31:00,759 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 05:31:00,759 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 8, 8] total 37 [2022-12-14 05:31:00,759 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273077459] [2022-12-14 05:31:00,759 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 05:31:00,760 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-12-14 05:31:00,760 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:31:00,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-12-14 05:31:00,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=575, Invalid=1495, Unknown=0, NotChecked=0, Total=2070 [2022-12-14 05:31:00,762 INFO L87 Difference]: Start difference. First operand 259 states and 394 transitions. Second operand has 37 states, 37 states have (on average 1.2972972972972974) internal successors, (48), 37 states have internal predecessors, (48), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 05:31:03,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:31:03,996 INFO L93 Difference]: Finished difference Result 632 states and 1030 transitions. [2022-12-14 05:31:03,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 162 states. [2022-12-14 05:31:03,996 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.2972972972972974) internal successors, (48), 37 states have internal predecessors, (48), 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 36 [2022-12-14 05:31:03,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:31:03,998 INFO L225 Difference]: With dead ends: 632 [2022-12-14 05:31:03,998 INFO L226 Difference]: Without dead ends: 397 [2022-12-14 05:31:04,003 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10879 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=9335, Invalid=23245, Unknown=0, NotChecked=0, Total=32580 [2022-12-14 05:31:04,003 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 956 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 550 mSolverCounterSat, 155 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1004 SdHoareTripleChecker+Valid, 235 SdHoareTripleChecker+Invalid, 705 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 155 IncrementalHoareTripleChecker+Valid, 550 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 05:31:04,004 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1004 Valid, 235 Invalid, 705 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [155 Valid, 550 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 05:31:04,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2022-12-14 05:31:04,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 388. [2022-12-14 05:31:04,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 337 states have (on average 1.2967359050445104) internal successors, (437), 337 states have internal predecessors, (437), 49 states have call successors, (49), 1 states have call predecessors, (49), 1 states have return successors, (49), 49 states have call predecessors, (49), 49 states have call successors, (49) [2022-12-14 05:31:04,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 535 transitions. [2022-12-14 05:31:04,048 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 535 transitions. Word has length 36 [2022-12-14 05:31:04,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:31:04,048 INFO L495 AbstractCegarLoop]: Abstraction has 388 states and 535 transitions. [2022-12-14 05:31:04,048 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.2972972972972974) internal successors, (48), 37 states have internal predecessors, (48), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 05:31:04,048 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 535 transitions. [2022-12-14 05:31:04,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-12-14 05:31:04,048 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:31:04,048 INFO L195 NwaCegarLoop]: trace histogram [24, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:31:04,052 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 05:31:04,249 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:31:04,250 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:31:04,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:31:04,251 INFO L85 PathProgramCache]: Analyzing trace with hash 1340318012, now seen corresponding path program 6 times [2022-12-14 05:31:04,252 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:31:04,252 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1594040638] [2022-12-14 05:31:04,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:31:04,253 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:31:04,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:31:04,701 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 05:31:04,701 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:31:04,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1594040638] [2022-12-14 05:31:04,701 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1594040638] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 05:31:04,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1265013455] [2022-12-14 05:31:04,701 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 05:31:04,702 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:31:04,702 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:31:04,702 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:31:04,703 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 05:31:04,766 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 05:31:04,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 05:31:04,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 05:31:04,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:31:04,805 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 05:31:04,806 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:31:05,210 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 05:31:05,210 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1265013455] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:31:05,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [948328966] [2022-12-14 05:31:05,211 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 05:31:05,211 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:31:05,211 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:31:05,212 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:31:05,212 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:31:05,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:31:05,223 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-12-14 05:31:05,223 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-12-14 05:31:05,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:31:05,235 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 05:31:05,236 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 05:31:05,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:31:05,246 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 05:31:05,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:31:05,269 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 05:31:05,284 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 05:31:05,285 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2022-12-14 05:31:05,321 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 05:31:05,359 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:31:05,360 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-12-14 05:31:05,369 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-12-14 05:31:05,377 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:31:05,571 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5746#(and (exists ((|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_~#a~0#1.base_BEFORE_CALL_6|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_6|) 4)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_6|))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 05:31:05,571 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:31:05,571 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 05:31:05,571 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 52 [2022-12-14 05:31:05,571 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117254052] [2022-12-14 05:31:05,571 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 05:31:05,572 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-12-14 05:31:05,572 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:31:05,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-12-14 05:31:05,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1667, Invalid=2115, Unknown=0, NotChecked=0, Total=3782 [2022-12-14 05:31:05,575 INFO L87 Difference]: Start difference. First operand 388 states and 535 transitions. Second operand has 53 states, 53 states have (on average 1.169811320754717) internal successors, (62), 52 states have internal predecessors, (62), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 05:31:06,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:31:06,759 INFO L93 Difference]: Finished difference Result 1036 states and 1537 transitions. [2022-12-14 05:31:06,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-12-14 05:31:06,759 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.169811320754717) internal successors, (62), 52 states have internal predecessors, (62), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2022-12-14 05:31:06,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:31:06,761 INFO L225 Difference]: With dead ends: 1036 [2022-12-14 05:31:06,761 INFO L226 Difference]: Without dead ends: 674 [2022-12-14 05:31:06,762 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 906 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1667, Invalid=2115, Unknown=0, NotChecked=0, Total=3782 [2022-12-14 05:31:06,763 INFO L413 NwaCegarLoop]: 111 mSDtfsCounter, 1563 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 1009 mSolverCounterSat, 456 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1663 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 1465 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 456 IncrementalHoareTripleChecker+Valid, 1009 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 05:31:06,763 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1663 Valid, 144 Invalid, 1465 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [456 Valid, 1009 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 05:31:06,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 674 states. [2022-12-14 05:31:06,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 674 to 674. [2022-12-14 05:31:06,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 674 states, 571 states have (on average 1.3572679509632224) internal successors, (775), 571 states have internal predecessors, (775), 101 states have call successors, (101), 1 states have call predecessors, (101), 1 states have return successors, (101), 101 states have call predecessors, (101), 101 states have call successors, (101) [2022-12-14 05:31:06,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 674 states to 674 states and 977 transitions. [2022-12-14 05:31:06,821 INFO L78 Accepts]: Start accepts. Automaton has 674 states and 977 transitions. Word has length 44 [2022-12-14 05:31:06,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:31:06,822 INFO L495 AbstractCegarLoop]: Abstraction has 674 states and 977 transitions. [2022-12-14 05:31:06,822 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.169811320754717) internal successors, (62), 52 states have internal predecessors, (62), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 05:31:06,822 INFO L276 IsEmpty]: Start isEmpty. Operand 674 states and 977 transitions. [2022-12-14 05:31:06,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-12-14 05:31:06,824 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:31:06,824 INFO L195 NwaCegarLoop]: trace histogram [50, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:31:06,829 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-12-14 05:31:07,025 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-12-14 05:31:07,025 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:31:07,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:31:07,026 INFO L85 PathProgramCache]: Analyzing trace with hash 185718236, now seen corresponding path program 7 times [2022-12-14 05:31:07,026 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:31:07,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [373985661] [2022-12-14 05:31:07,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:31:07,026 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:31:07,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:31:08,255 INFO L134 CoverageAnalysis]: Checked inductivity of 1330 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 05:31:08,256 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:31:08,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [373985661] [2022-12-14 05:31:08,256 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [373985661] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 05:31:08,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [357943063] [2022-12-14 05:31:08,256 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 05:31:08,256 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:31:08,256 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:31:08,257 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:31:08,258 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 05:31:08,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:31:08,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 559 conjuncts, 52 conjunts are in the unsatisfiable core [2022-12-14 05:31:08,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:31:08,441 INFO L134 CoverageAnalysis]: Checked inductivity of 1330 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 05:31:08,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:31:10,248 INFO L134 CoverageAnalysis]: Checked inductivity of 1330 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 05:31:10,248 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [357943063] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:31:10,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1672538753] [2022-12-14 05:31:10,250 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 05:31:10,250 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:31:10,251 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:31:10,251 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:31:10,251 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:31:10,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:31:10,267 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 05:31:10,267 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 05:31:10,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:31:10,273 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-12-14 05:31:10,284 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:31:10,285 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 05:31:10,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:31:10,309 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 05:31:10,326 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 05:31:10,326 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2022-12-14 05:31:10,367 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 05:31:10,402 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:31:10,403 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-12-14 05:31:10,413 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-12-14 05:31:10,421 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:31:10,634 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9426#(and (exists ((|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_7| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_7|) (= |__VERIFIER_assert_#in~cond| (ite (<= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_7|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_7|) 4)) 1 0)))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 05:31:10,634 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:31:10,634 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 05:31:10,634 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 104 [2022-12-14 05:31:10,634 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1551398836] [2022-12-14 05:31:10,634 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 05:31:10,635 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 105 states [2022-12-14 05:31:10,635 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:31:10,638 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2022-12-14 05:31:10,643 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6009, Invalid=6873, Unknown=0, NotChecked=0, Total=12882 [2022-12-14 05:31:10,643 INFO L87 Difference]: Start difference. First operand 674 states and 977 transitions. Second operand has 105 states, 105 states have (on average 1.0857142857142856) internal successors, (114), 104 states have internal predecessors, (114), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 05:31:16,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:31:16,281 INFO L93 Difference]: Finished difference Result 1868 states and 2889 transitions. [2022-12-14 05:31:16,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2022-12-14 05:31:16,282 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 105 states have (on average 1.0857142857142856) internal successors, (114), 104 states have internal predecessors, (114), 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 70 [2022-12-14 05:31:16,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:31:16,285 INFO L225 Difference]: With dead ends: 1868 [2022-12-14 05:31:16,285 INFO L226 Difference]: Without dead ends: 1246 [2022-12-14 05:31:16,287 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1842 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=6009, Invalid=6873, Unknown=0, NotChecked=0, Total=12882 [2022-12-14 05:31:16,287 INFO L413 NwaCegarLoop]: 215 mSDtfsCounter, 3701 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 2500 mSolverCounterSat, 1119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3905 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 3619 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1119 IncrementalHoareTripleChecker+Valid, 2500 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-12-14 05:31:16,288 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3905 Valid, 270 Invalid, 3619 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1119 Valid, 2500 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-12-14 05:31:16,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1246 states. [2022-12-14 05:31:16,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1246 to 1246. [2022-12-14 05:31:16,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1246 states, 1039 states have (on average 1.3965351299326276) internal successors, (1451), 1039 states have internal predecessors, (1451), 205 states have call successors, (205), 1 states have call predecessors, (205), 1 states have return successors, (205), 205 states have call predecessors, (205), 205 states have call successors, (205) [2022-12-14 05:31:16,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1246 states to 1246 states and 1861 transitions. [2022-12-14 05:31:16,382 INFO L78 Accepts]: Start accepts. Automaton has 1246 states and 1861 transitions. Word has length 70 [2022-12-14 05:31:16,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:31:16,382 INFO L495 AbstractCegarLoop]: Abstraction has 1246 states and 1861 transitions. [2022-12-14 05:31:16,382 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 105 states, 105 states have (on average 1.0857142857142856) internal successors, (114), 104 states have internal predecessors, (114), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 05:31:16,382 INFO L276 IsEmpty]: Start isEmpty. Operand 1246 states and 1861 transitions. [2022-12-14 05:31:16,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2022-12-14 05:31:16,383 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:31:16,383 INFO L195 NwaCegarLoop]: trace histogram [102, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:31:16,389 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 05:31:16,583 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-12-14 05:31:16,584 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:31:16,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:31:16,584 INFO L85 PathProgramCache]: Analyzing trace with hash -1547917540, now seen corresponding path program 8 times [2022-12-14 05:31:16,584 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:31:16,584 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [5960895] [2022-12-14 05:31:16,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:31:16,584 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:31:16,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:31:20,740 INFO L134 CoverageAnalysis]: Checked inductivity of 5308 backedges. 0 proven. 5253 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 05:31:20,740 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:31:20,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [5960895] [2022-12-14 05:31:20,741 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [5960895] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 05:31:20,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1999527781] [2022-12-14 05:31:20,741 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 05:31:20,741 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:31:20,741 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:31:20,742 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:31:20,742 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 05:31:20,919 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-12-14 05:31:20,920 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 05:31:20,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 13 conjunts are in the unsatisfiable core [2022-12-14 05:31:20,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:31:21,292 INFO L134 CoverageAnalysis]: Checked inductivity of 5308 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 5253 trivial. 0 not checked. [2022-12-14 05:31:21,292 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:31:21,810 INFO L134 CoverageAnalysis]: Checked inductivity of 5308 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 5253 trivial. 0 not checked. [2022-12-14 05:31:21,810 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1999527781] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:31:21,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [469667845] [2022-12-14 05:31:21,812 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 05:31:21,812 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:31:21,812 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:31:21,812 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:31:21,812 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:31:21,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:31:21,830 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-12-14 05:31:21,830 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-12-14 05:31:21,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:31:21,847 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 05:31:21,847 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 05:31:21,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:31:21,862 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 05:31:21,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:31:21,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:31:21,898 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 05:31:21,898 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2022-12-14 05:31:21,930 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 05:31:21,960 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:31:21,961 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-12-14 05:31:21,970 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-12-14 05:31:21,978 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:31:22,410 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15990#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|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_~#a~0#1.base_BEFORE_CALL_8|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_8|) 4)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_8|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 05:31:22,410 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:31:22,410 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 05:31:22,411 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [104, 14, 14] total 129 [2022-12-14 05:31:22,411 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000343805] [2022-12-14 05:31:22,411 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 05:31:22,412 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 129 states [2022-12-14 05:31:22,412 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:31:22,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 129 interpolants. [2022-12-14 05:31:22,416 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6505, Invalid=12401, Unknown=0, NotChecked=0, Total=18906 [2022-12-14 05:31:22,416 INFO L87 Difference]: Start difference. First operand 1246 states and 1861 transitions. Second operand has 129 states, 129 states have (on average 1.0852713178294573) internal successors, (140), 129 states have internal predecessors, (140), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 05:34:39,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:34:39,218 INFO L93 Difference]: Finished difference Result 3414 states and 5660 transitions. [2022-12-14 05:34:39,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 1317 states. [2022-12-14 05:34:39,218 INFO L78 Accepts]: Start accepts. Automaton has has 129 states, 129 states have (on average 1.0852713178294573) internal successors, (140), 129 states have internal predecessors, (140), 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 122 [2022-12-14 05:34:39,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:34:39,223 INFO L225 Difference]: With dead ends: 3414 [2022-12-14 05:34:39,223 INFO L226 Difference]: Without dead ends: 2272 [2022-12-14 05:34:39,369 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1678 GetRequests, 332 SyntacticMatches, 0 SemanticMatches, 1346 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 748824 ImplicationChecksByTransitivity, 164.0s TimeCoverageRelationStatistics Valid=517477, Invalid=1298279, Unknown=0, NotChecked=0, Total=1815756 [2022-12-14 05:34:39,369 INFO L413 NwaCegarLoop]: 221 mSDtfsCounter, 7604 mSDsluCounter, 767 mSDsCounter, 0 mSdLazyCounter, 2519 mSolverCounterSat, 932 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7812 SdHoareTripleChecker+Valid, 988 SdHoareTripleChecker+Invalid, 3451 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 932 IncrementalHoareTripleChecker+Valid, 2519 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-12-14 05:34:39,369 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7812 Valid, 988 Invalid, 3451 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [932 Valid, 2519 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-12-14 05:34:39,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2272 states. [2022-12-14 05:34:39,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2272 to 2263. [2022-12-14 05:34:39,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2263 states, 2052 states have (on average 1.2046783625730995) internal successors, (2472), 2052 states have internal predecessors, (2472), 209 states have call successors, (209), 1 states have call predecessors, (209), 1 states have return successors, (209), 209 states have call predecessors, (209), 209 states have call successors, (209) [2022-12-14 05:34:39,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2263 states to 2263 states and 2890 transitions. [2022-12-14 05:34:39,728 INFO L78 Accepts]: Start accepts. Automaton has 2263 states and 2890 transitions. Word has length 122 [2022-12-14 05:34:39,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:34:39,729 INFO L495 AbstractCegarLoop]: Abstraction has 2263 states and 2890 transitions. [2022-12-14 05:34:39,729 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 129 states, 129 states have (on average 1.0852713178294573) internal successors, (140), 129 states have internal predecessors, (140), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 05:34:39,729 INFO L276 IsEmpty]: Start isEmpty. Operand 2263 states and 2890 transitions. [2022-12-14 05:34:39,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2022-12-14 05:34:39,731 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:34:39,731 INFO L195 NwaCegarLoop]: trace histogram [104, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:34:39,737 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-12-14 05:34:39,931 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:34:39,932 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:34:39,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:34:39,934 INFO L85 PathProgramCache]: Analyzing trace with hash 1716508604, now seen corresponding path program 9 times [2022-12-14 05:34:39,934 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:34:39,935 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [406075809] [2022-12-14 05:34:39,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:34:39,935 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:34:40,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:34:44,359 INFO L134 CoverageAnalysis]: Checked inductivity of 5713 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-12-14 05:34:44,359 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:34:44,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [406075809] [2022-12-14 05:34:44,359 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [406075809] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 05:34:44,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1778019194] [2022-12-14 05:34:44,359 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 05:34:44,359 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:34:44,359 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:34:44,360 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:34:44,361 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 05:34:44,518 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 05:34:44,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 05:34:44,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 1093 conjuncts, 106 conjunts are in the unsatisfiable core [2022-12-14 05:34:44,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:34:44,630 INFO L134 CoverageAnalysis]: Checked inductivity of 5713 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-12-14 05:34:44,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:34:53,195 INFO L134 CoverageAnalysis]: Checked inductivity of 5713 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-12-14 05:34:53,195 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1778019194] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:34:53,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [654665156] [2022-12-14 05:34:53,197 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 05:34:53,197 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:34:53,197 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:34:53,197 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:34:53,197 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:34:53,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:34:53,214 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-12-14 05:34:53,215 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-12-14 05:34:53,221 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:34:53,232 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 05:34:53,232 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 05:34:53,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:34:53,247 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 05:34:53,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:34:53,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:34:53,291 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 05:34:53,291 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2022-12-14 05:34:53,321 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 05:34:53,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:34:53,355 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-12-14 05:34:53,364 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-12-14 05:34:53,372 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:34:53,703 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30154#(and (exists ((|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_9| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_9|) (= |__VERIFIER_assert_#in~cond| (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_~#a~0#1.base_BEFORE_CALL_9|) 4)) 1 0)))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 05:34:53,703 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:34:53,704 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 05:34:53,704 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [106, 106, 106] total 212 [2022-12-14 05:34:53,704 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1055740525] [2022-12-14 05:34:53,704 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 05:34:53,704 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 213 states [2022-12-14 05:34:53,704 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:34:53,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 213 interpolants. [2022-12-14 05:34:53,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23667, Invalid=25395, Unknown=0, NotChecked=0, Total=49062 [2022-12-14 05:34:53,712 INFO L87 Difference]: Start difference. First operand 2263 states and 2890 transitions. Second operand has 213 states, 213 states have (on average 1.0422535211267605) internal successors, (222), 212 states have internal predecessors, (222), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 05:35:49,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:35:49,111 INFO L93 Difference]: Finished difference Result 5586 states and 7687 transitions. [2022-12-14 05:35:49,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 212 states. [2022-12-14 05:35:49,111 INFO L78 Accepts]: Start accepts. Automaton has has 213 states, 213 states have (on average 1.0422535211267605) internal successors, (222), 212 states have internal predecessors, (222), 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 136 [2022-12-14 05:35:49,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:35:49,119 INFO L225 Difference]: With dead ends: 5586 [2022-12-14 05:35:49,119 INFO L226 Difference]: Without dead ends: 3429 [2022-12-14 05:35:49,124 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 292 SyntacticMatches, 0 SemanticMatches, 220 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3786 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=23667, Invalid=25395, Unknown=0, NotChecked=0, Total=49062 [2022-12-14 05:35:49,124 INFO L413 NwaCegarLoop]: 431 mSDtfsCounter, 10011 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 5086 mSolverCounterSat, 3183 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10431 SdHoareTripleChecker+Valid, 541 SdHoareTripleChecker+Invalid, 8269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3183 IncrementalHoareTripleChecker+Valid, 5086 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.4s IncrementalHoareTripleChecker+Time [2022-12-14 05:35:49,125 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10431 Valid, 541 Invalid, 8269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3183 Valid, 5086 Invalid, 0 Unknown, 0 Unchecked, 5.4s Time] [2022-12-14 05:35:49,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3429 states. [2022-12-14 05:35:49,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3429 to 3429. [2022-12-14 05:35:49,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3429 states, 3006 states have (on average 1.2807717897538258) internal successors, (3850), 3006 states have internal predecessors, (3850), 421 states have call successors, (421), 1 states have call predecessors, (421), 1 states have return successors, (421), 421 states have call predecessors, (421), 421 states have call successors, (421) [2022-12-14 05:35:49,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3429 states to 3429 states and 4692 transitions. [2022-12-14 05:35:49,419 INFO L78 Accepts]: Start accepts. Automaton has 3429 states and 4692 transitions. Word has length 136 [2022-12-14 05:35:49,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:35:49,419 INFO L495 AbstractCegarLoop]: Abstraction has 3429 states and 4692 transitions. [2022-12-14 05:35:49,419 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 213 states, 213 states have (on average 1.0422535211267605) internal successors, (222), 212 states have internal predecessors, (222), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 05:35:49,420 INFO L276 IsEmpty]: Start isEmpty. Operand 3429 states and 4692 transitions. [2022-12-14 05:35:49,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2022-12-14 05:35:49,422 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:35:49,422 INFO L195 NwaCegarLoop]: trace histogram [210, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:35:49,429 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-12-14 05:35:49,622 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:35:49,624 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:35:49,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:35:49,625 INFO L85 PathProgramCache]: Analyzing trace with hash 1550850396, now seen corresponding path program 10 times [2022-12-14 05:35:49,625 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:35:49,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1770814730] [2022-12-14 05:35:49,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:35:49,626 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:35:49,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:36:05,862 INFO L134 CoverageAnalysis]: Checked inductivity of 22408 backedges. 0 proven. 22155 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-12-14 05:36:05,862 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:36:05,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1770814730] [2022-12-14 05:36:05,862 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1770814730] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 05:36:05,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1768346761] [2022-12-14 05:36:05,863 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 05:36:05,863 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:36:05,863 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:36:05,863 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:36:05,864 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb415f44-6875-4c2b-b981-d7abdc381886/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 05:36:06,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:36:06,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 2047 conjuncts, 212 conjunts are in the unsatisfiable core [2022-12-14 05:36:06,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:36:06,342 INFO L134 CoverageAnalysis]: Checked inductivity of 22408 backedges. 0 proven. 22155 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-12-14 05:36:06,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:36:39,104 INFO L134 CoverageAnalysis]: Checked inductivity of 22408 backedges. 0 proven. 22155 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-12-14 05:36:39,104 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1768346761] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:36:39,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [408429563] [2022-12-14 05:36:39,105 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 05:36:39,105 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:36:39,105 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:36:39,105 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:36:39,105 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:36:39,112 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:36:39,124 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 05:36:39,124 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 05:36:39,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:36:39,131 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-12-14 05:36:39,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:36:39,144 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 05:36:39,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:36:39,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:36:39,177 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 05:36:39,177 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2022-12-14 05:36:39,200 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 05:36:39,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 05:36:39,230 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-12-14 05:36:39,239 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-12-14 05:36:39,248 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:36:39,842 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '48996#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_10| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (<= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_10|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_10|) 4)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_10|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 05:36:39,842 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:36:39,842 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 05:36:39,842 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [212, 212, 212] total 424 [2022-12-14 05:36:39,842 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391023440] [2022-12-14 05:36:39,842 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 05:36:39,844 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 425 states [2022-12-14 05:36:39,844 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:36:39,868 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 425 interpolants. [2022-12-14 05:36:39,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92249, Invalid=95673, Unknown=0, NotChecked=0, Total=187922 [2022-12-14 05:36:39,878 INFO L87 Difference]: Start difference. First operand 3429 states and 4692 transitions. Second operand has 425 states, 425 states have (on average 1.0211764705882354) internal successors, (434), 424 states have internal predecessors, (434), 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)