./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/heavy-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 38b53e6a Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/heavy-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 544ff1a31d34f1c818140bb31fb5c7091aef904c3b9f7e17a0cc8560e99eb61a --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-38b53e6 [2022-11-25 23:37:58,340 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-25 23:37:58,343 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-25 23:37:58,388 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-25 23:37:58,389 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-25 23:37:58,390 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-25 23:37:58,391 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-25 23:37:58,393 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-25 23:37:58,395 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-25 23:37:58,396 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-25 23:37:58,397 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-25 23:37:58,398 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-25 23:37:58,402 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-25 23:37:58,408 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-25 23:37:58,410 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-25 23:37:58,413 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-25 23:37:58,415 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-25 23:37:58,417 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-25 23:37:58,419 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-25 23:37:58,426 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-25 23:37:58,428 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-25 23:37:58,431 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-25 23:37:58,433 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-25 23:37:58,434 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-25 23:37:58,444 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-25 23:37:58,445 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-25 23:37:58,445 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-25 23:37:58,447 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-25 23:37:58,448 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-25 23:37:58,449 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-25 23:37:58,449 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-25 23:37:58,450 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-25 23:37:58,452 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-25 23:37:58,453 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-25 23:37:58,454 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-25 23:37:58,454 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-25 23:37:58,455 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-25 23:37:58,455 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-25 23:37:58,455 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-25 23:37:58,456 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-25 23:37:58,457 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-25 23:37:58,458 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-25 23:37:58,505 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-25 23:37:58,505 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-25 23:37:58,506 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-25 23:37:58,506 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-25 23:37:58,507 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-25 23:37:58,507 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-25 23:37:58,507 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-25 23:37:58,507 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-25 23:37:58,507 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-25 23:37:58,508 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-25 23:37:58,509 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-25 23:37:58,509 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-25 23:37:58,509 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-25 23:37:58,509 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-25 23:37:58,510 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-25 23:37:58,510 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-25 23:37:58,510 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-25 23:37:58,510 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-25 23:37:58,511 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-25 23:37:58,512 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-25 23:37:58,512 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-25 23:37:58,512 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-25 23:37:58,512 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-25 23:37:58,512 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-25 23:37:58,513 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-25 23:37:58,513 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-25 23:37:58,513 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-25 23:37:58,514 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-25 23:37:58,514 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-25 23:37:58,514 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-25 23:37:58,514 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-25 23:37:58,515 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-25 23:37:58,515 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 23:37:58,515 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-25 23:37:58,515 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-25 23:37:58,515 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-25 23:37:58,516 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-25 23:37:58,516 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-25 23:37:58,516 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-25 23:37:58,516 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-25 23:37:58,516 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-25 23:37:58,517 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_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 544ff1a31d34f1c818140bb31fb5c7091aef904c3b9f7e17a0cc8560e99eb61a [2022-11-25 23:37:58,790 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-25 23:37:58,823 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-25 23:37:58,826 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-25 23:37:58,828 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-25 23:37:58,828 INFO L275 PluginConnector]: CDTParser initialized [2022-11-25 23:37:58,829 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/loops/heavy-1.c [2022-11-25 23:38:01,962 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-25 23:38:02,140 INFO L351 CDTParser]: Found 1 translation units. [2022-11-25 23:38:02,141 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/sv-benchmarks/c/loops/heavy-1.c [2022-11-25 23:38:02,148 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/data/06f5062d8/5e4fcce1aaf240979197b85f9c9552c3/FLAG9e2303299 [2022-11-25 23:38:02,169 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/data/06f5062d8/5e4fcce1aaf240979197b85f9c9552c3 [2022-11-25 23:38:02,171 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-25 23:38:02,173 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-25 23:38:02,177 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-25 23:38:02,178 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-25 23:38:02,181 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-25 23:38:02,182 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 11:38:02" (1/1) ... [2022-11-25 23:38:02,184 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1e25755a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:02, skipping insertion in model container [2022-11-25 23:38:02,184 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 11:38:02" (1/1) ... [2022-11-25 23:38:02,194 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-25 23:38:02,216 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-25 23:38:02,403 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_e56af4aa-cff5-4ba5-a034-2d8563821b67/sv-benchmarks/c/loops/heavy-1.c[600,613] [2022-11-25 23:38:02,409 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 23:38:02,455 INFO L203 MainTranslator]: Completed pre-run [2022-11-25 23:38:02,471 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_e56af4aa-cff5-4ba5-a034-2d8563821b67/sv-benchmarks/c/loops/heavy-1.c[600,613] [2022-11-25 23:38:02,472 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 23:38:02,523 INFO L208 MainTranslator]: Completed translation [2022-11-25 23:38:02,523 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:02 WrapperNode [2022-11-25 23:38:02,523 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-25 23:38:02,524 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-25 23:38:02,525 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-25 23:38:02,525 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-25 23:38:02,532 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:02" (1/1) ... [2022-11-25 23:38:02,539 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:02" (1/1) ... [2022-11-25 23:38:02,564 INFO L138 Inliner]: procedures = 12, calls = 13, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 60 [2022-11-25 23:38:02,566 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-25 23:38:02,566 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-25 23:38:02,567 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-25 23:38:02,567 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-25 23:38:02,576 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:02" (1/1) ... [2022-11-25 23:38:02,576 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:02" (1/1) ... [2022-11-25 23:38:02,591 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:02" (1/1) ... [2022-11-25 23:38:02,592 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:02" (1/1) ... [2022-11-25 23:38:02,596 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:02" (1/1) ... [2022-11-25 23:38:02,604 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:02" (1/1) ... [2022-11-25 23:38:02,605 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:02" (1/1) ... [2022-11-25 23:38:02,605 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:02" (1/1) ... [2022-11-25 23:38:02,607 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-25 23:38:02,608 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-25 23:38:02,608 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-25 23:38:02,608 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-25 23:38:02,609 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:02" (1/1) ... [2022-11-25 23:38:02,626 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 23:38:02,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:38:02,650 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-25 23:38:02,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-25 23:38:02,689 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-25 23:38:02,690 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-25 23:38:02,690 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-25 23:38:02,690 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-25 23:38:02,690 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-25 23:38:02,691 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-25 23:38:02,691 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2022-11-25 23:38:02,765 INFO L235 CfgBuilder]: Building ICFG [2022-11-25 23:38:02,767 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-25 23:38:02,895 INFO L276 CfgBuilder]: Performing block encoding [2022-11-25 23:38:02,932 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-25 23:38:02,933 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-25 23:38:02,935 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 11:38:02 BoogieIcfgContainer [2022-11-25 23:38:02,935 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-25 23:38:02,937 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-25 23:38:02,937 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-25 23:38:02,942 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-25 23:38:02,942 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 11:38:02" (1/3) ... [2022-11-25 23:38:02,943 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77bc9a20 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 11:38:02, skipping insertion in model container [2022-11-25 23:38:02,943 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:02" (2/3) ... [2022-11-25 23:38:02,943 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77bc9a20 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 11:38:02, skipping insertion in model container [2022-11-25 23:38:02,944 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 11:38:02" (3/3) ... [2022-11-25 23:38:02,945 INFO L112 eAbstractionObserver]: Analyzing ICFG heavy-1.c [2022-11-25 23:38:02,964 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-25 23:38:02,964 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-25 23:38:03,010 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-25 23:38:03,016 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;@1813d699, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-25 23:38:03,016 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-25 23:38:03,020 INFO L276 IsEmpty]: Start isEmpty. Operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:03,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-25 23:38:03,025 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:03,025 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-25 23:38:03,026 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:03,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:03,032 INFO L85 PathProgramCache]: Analyzing trace with hash 2496104, now seen corresponding path program 1 times [2022-11-25 23:38:03,042 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:03,042 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1932503098] [2022-11-25 23:38:03,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:03,043 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:03,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:03,263 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:03,264 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:03,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1932503098] [2022-11-25 23:38:03,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1932503098] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:38:03,265 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:38:03,266 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-25 23:38:03,267 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117016804] [2022-11-25 23:38:03,268 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:38:03,271 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:38:03,272 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:03,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:38:03,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:38:03,324 INFO L87 Difference]: Start difference. First operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:03,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:03,367 INFO L93 Difference]: Finished difference Result 17 states and 23 transitions. [2022-11-25 23:38:03,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:38:03,369 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-11-25 23:38:03,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:03,376 INFO L225 Difference]: With dead ends: 17 [2022-11-25 23:38:03,377 INFO L226 Difference]: Without dead ends: 10 [2022-11-25 23:38:03,396 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:38:03,400 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 4 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:03,401 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 8 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:38:03,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2022-11-25 23:38:03,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 8. [2022-11-25 23:38:03,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:03,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 10 transitions. [2022-11-25 23:38:03,449 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 10 transitions. Word has length 4 [2022-11-25 23:38:03,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:03,449 INFO L495 AbstractCegarLoop]: Abstraction has 8 states and 10 transitions. [2022-11-25 23:38:03,449 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:03,449 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 10 transitions. [2022-11-25 23:38:03,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-25 23:38:03,450 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:03,450 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-25 23:38:03,450 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-25 23:38:03,471 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:03,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:03,472 INFO L85 PathProgramCache]: Analyzing trace with hash -1936420166, now seen corresponding path program 1 times [2022-11-25 23:38:03,472 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:03,472 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1680286967] [2022-11-25 23:38:03,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:03,472 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:03,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:03,625 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:03,625 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:03,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1680286967] [2022-11-25 23:38:03,626 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1680286967] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:38:03,626 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:38:03,626 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 23:38:03,626 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [841664865] [2022-11-25 23:38:03,627 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:38:03,628 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:38:03,628 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:03,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:38:03,629 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:38:03,629 INFO L87 Difference]: Start difference. First operand 8 states and 10 transitions. Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:03,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:03,663 INFO L93 Difference]: Finished difference Result 16 states and 22 transitions. [2022-11-25 23:38:03,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:38:03,664 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-25 23:38:03,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:03,664 INFO L225 Difference]: With dead ends: 16 [2022-11-25 23:38:03,664 INFO L226 Difference]: Without dead ends: 10 [2022-11-25 23:38:03,665 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:38:03,666 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:03,667 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 5 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:38:03,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2022-11-25 23:38:03,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 9. [2022-11-25 23:38:03,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:03,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2022-11-25 23:38:03,671 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 6 [2022-11-25 23:38:03,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:03,671 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 11 transitions. [2022-11-25 23:38:03,671 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:03,672 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 11 transitions. [2022-11-25 23:38:03,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-25 23:38:03,672 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:03,672 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:38:03,672 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-25 23:38:03,673 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:03,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:03,673 INFO L85 PathProgramCache]: Analyzing trace with hash 2032239394, now seen corresponding path program 1 times [2022-11-25 23:38:03,674 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:03,674 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [904099035] [2022-11-25 23:38:03,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:03,674 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:03,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:03,789 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:03,789 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:03,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [904099035] [2022-11-25 23:38:03,790 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [904099035] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:38:03,790 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:38:03,790 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 23:38:03,790 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880603512] [2022-11-25 23:38:03,791 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:38:03,791 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:38:03,791 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:03,792 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:38:03,792 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:38:03,793 INFO L87 Difference]: Start difference. First operand 9 states and 11 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:03,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:03,827 INFO L93 Difference]: Finished difference Result 17 states and 22 transitions. [2022-11-25 23:38:03,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:38:03,828 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-25 23:38:03,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:03,829 INFO L225 Difference]: With dead ends: 17 [2022-11-25 23:38:03,829 INFO L226 Difference]: Without dead ends: 10 [2022-11-25 23:38:03,830 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:38:03,831 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:03,832 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 7 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:38:03,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2022-11-25 23:38:03,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2022-11-25 23:38:03,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:03,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2022-11-25 23:38:03,836 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 8 [2022-11-25 23:38:03,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:03,836 INFO L495 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2022-11-25 23:38:03,836 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:03,837 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2022-11-25 23:38:03,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-25 23:38:03,837 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:03,837 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:38:03,837 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-25 23:38:03,838 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:03,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:03,839 INFO L85 PathProgramCache]: Analyzing trace with hash -1594945054, now seen corresponding path program 1 times [2022-11-25 23:38:03,839 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:03,839 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1118151173] [2022-11-25 23:38:03,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:03,839 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:03,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:04,032 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:04,032 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:04,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1118151173] [2022-11-25 23:38:04,033 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1118151173] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:38:04,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1605299045] [2022-11-25 23:38:04,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:04,033 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:04,034 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:38:04,037 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:38:04,057 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-25 23:38:04,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:04,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-25 23:38:04,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:38:04,208 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 23:38:04,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:38:04,261 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 23:38:04,261 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1605299045] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:38:04,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [188486194] [2022-11-25 23:38:04,293 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-25 23:38:04,294 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:38:04,298 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:38:04,304 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:38:04,304 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:38:04,430 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2022-11-25 23:38:04,606 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 138 treesize of output 122 [2022-11-25 23:38:05,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:38:05,255 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 527 treesize of output 505 [2022-11-25 23:38:05,429 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:38:05,468 INFO L321 Elim1Store]: treesize reduction 84, result has 55.6 percent of original size [2022-11-25 23:38:05,469 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 177 treesize of output 146 [2022-11-25 23:38:05,698 INFO L321 Elim1Store]: treesize reduction 156, result has 50.2 percent of original size [2022-11-25 23:38:05,699 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2022-11-25 23:38:05,977 INFO L321 Elim1Store]: treesize reduction 156, result has 50.2 percent of original size [2022-11-25 23:38:05,978 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2022-11-25 23:38:06,177 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:38:06,362 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '205#(and (= |ULTIMATE.start_main_~a~0#1| 1) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |~#array~0.offset| 0) (= 4 |~#array~0.base|) (not (< (mod |ULTIMATE.start_main_~i~0#1| 4294967296) 1048576)) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:38:06,363 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:38:06,363 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:38:06,363 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2022-11-25 23:38:06,364 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777445934] [2022-11-25 23:38:06,366 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:38:06,366 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-25 23:38:06,367 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:06,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-25 23:38:06,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-11-25 23:38:06,371 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:06,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:06,595 INFO L93 Difference]: Finished difference Result 31 states and 45 transitions. [2022-11-25 23:38:06,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-25 23:38:06,596 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-25 23:38:06,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:06,597 INFO L225 Difference]: With dead ends: 31 [2022-11-25 23:38:06,597 INFO L226 Difference]: Without dead ends: 23 [2022-11-25 23:38:06,598 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2022-11-25 23:38:06,599 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:06,599 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 13 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:38:06,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-11-25 23:38:06,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-11-25 23:38:06,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 22 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:06,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2022-11-25 23:38:06,611 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 9 [2022-11-25 23:38:06,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:06,611 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2022-11-25 23:38:06,611 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:06,611 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2022-11-25 23:38:06,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-25 23:38:06,612 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:06,612 INFO L195 NwaCegarLoop]: trace histogram [8, 4, 4, 1, 1, 1, 1, 1, 1] [2022-11-25 23:38:06,629 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-25 23:38:06,813 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:06,813 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:06,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:06,814 INFO L85 PathProgramCache]: Analyzing trace with hash 1215888474, now seen corresponding path program 2 times [2022-11-25 23:38:06,814 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:06,814 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1619691034] [2022-11-25 23:38:06,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:06,815 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:06,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:07,164 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 32 proven. 3 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-25 23:38:07,164 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:07,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1619691034] [2022-11-25 23:38:07,165 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1619691034] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:38:07,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [589448345] [2022-11-25 23:38:07,166 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:38:07,166 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:07,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:38:07,167 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:38:07,184 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-25 23:38:07,244 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-25 23:38:07,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:38:07,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-25 23:38:07,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:38:07,298 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2022-11-25 23:38:07,298 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:38:07,373 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2022-11-25 23:38:07,373 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [589448345] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:38:07,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1900076585] [2022-11-25 23:38:07,375 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-25 23:38:07,376 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:38:07,376 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:38:07,376 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:38:07,377 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:38:07,401 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2022-11-25 23:38:07,490 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 201 treesize of output 185 [2022-11-25 23:38:07,864 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:38:07,865 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 615 treesize of output 593 [2022-11-25 23:38:07,975 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:38:08,012 INFO L321 Elim1Store]: treesize reduction 84, result has 55.6 percent of original size [2022-11-25 23:38:08,013 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 177 treesize of output 146 [2022-11-25 23:38:08,196 INFO L321 Elim1Store]: treesize reduction 156, result has 50.2 percent of original size [2022-11-25 23:38:08,197 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2022-11-25 23:38:08,392 INFO L321 Elim1Store]: treesize reduction 156, result has 50.2 percent of original size [2022-11-25 23:38:08,392 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2022-11-25 23:38:08,527 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:38:08,747 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '461#(and (= |ULTIMATE.start_main_~a~0#1| 1) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |~#array~0.offset| 0) (= 4 |~#array~0.base|) (not (< (mod |ULTIMATE.start_main_~i~0#1| 4294967296) 1048576)) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:38:08,748 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:38:08,748 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:38:08,748 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 3, 3] total 9 [2022-11-25 23:38:08,748 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289480604] [2022-11-25 23:38:08,748 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:38:08,749 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-25 23:38:08,749 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:08,749 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-25 23:38:08,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2022-11-25 23:38:08,750 INFO L87 Difference]: Start difference. First operand 23 states and 28 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 9 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:09,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:09,046 INFO L93 Difference]: Finished difference Result 114 states and 158 transitions. [2022-11-25 23:38:09,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-25 23:38:09,047 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 9 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2022-11-25 23:38:09,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:09,048 INFO L225 Difference]: With dead ends: 114 [2022-11-25 23:38:09,048 INFO L226 Difference]: Without dead ends: 93 [2022-11-25 23:38:09,049 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 55 SyntacticMatches, 5 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=148, Invalid=452, Unknown=0, NotChecked=0, Total=600 [2022-11-25 23:38:09,049 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 21 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:09,050 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 21 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:38:09,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-11-25 23:38:09,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2022-11-25 23:38:09,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.2282608695652173) internal successors, (113), 92 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:09,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 113 transitions. [2022-11-25 23:38:09,074 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 113 transitions. Word has length 22 [2022-11-25 23:38:09,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:09,075 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 113 transitions. [2022-11-25 23:38:09,075 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 9 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:09,075 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 113 transitions. [2022-11-25 23:38:09,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-11-25 23:38:09,078 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:09,078 INFO L195 NwaCegarLoop]: trace histogram [48, 16, 16, 4, 4, 1, 1, 1, 1] [2022-11-25 23:38:09,092 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-25 23:38:09,283 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:09,283 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:09,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:09,284 INFO L85 PathProgramCache]: Analyzing trace with hash -419899728, now seen corresponding path program 3 times [2022-11-25 23:38:09,284 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:09,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1510702165] [2022-11-25 23:38:09,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:09,284 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:09,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:10,176 INFO L134 CoverageAnalysis]: Checked inductivity of 2216 backedges. 263 proven. 6 refuted. 0 times theorem prover too weak. 1947 trivial. 0 not checked. [2022-11-25 23:38:10,176 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:10,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1510702165] [2022-11-25 23:38:10,177 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1510702165] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:38:10,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [325658024] [2022-11-25 23:38:10,177 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:38:10,177 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:10,177 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:38:10,178 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:38:10,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-25 23:38:10,434 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:38:10,434 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:38:10,438 INFO L263 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-25 23:38:10,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:38:10,513 INFO L134 CoverageAnalysis]: Checked inductivity of 2216 backedges. 263 proven. 6 refuted. 0 times theorem prover too weak. 1947 trivial. 0 not checked. [2022-11-25 23:38:10,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:38:10,698 INFO L134 CoverageAnalysis]: Checked inductivity of 2216 backedges. 695 proven. 57 refuted. 0 times theorem prover too weak. 1464 trivial. 0 not checked. [2022-11-25 23:38:10,698 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [325658024] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:38:10,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1155019994] [2022-11-25 23:38:10,701 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-25 23:38:10,701 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:38:10,701 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:38:10,701 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:38:10,702 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:38:10,721 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2022-11-25 23:38:10,783 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 201 treesize of output 185 [2022-11-25 23:38:11,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:38:11,151 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 615 treesize of output 593 [2022-11-25 23:38:11,248 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:38:11,287 INFO L321 Elim1Store]: treesize reduction 84, result has 55.6 percent of original size [2022-11-25 23:38:11,288 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 177 treesize of output 146 [2022-11-25 23:38:11,482 INFO L321 Elim1Store]: treesize reduction 156, result has 50.2 percent of original size [2022-11-25 23:38:11,483 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2022-11-25 23:38:11,655 INFO L321 Elim1Store]: treesize reduction 156, result has 50.2 percent of original size [2022-11-25 23:38:11,655 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2022-11-25 23:38:11,802 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:38:12,561 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1461#(and (= |ULTIMATE.start_main_~a~0#1| 1) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |~#array~0.offset| 0) (= 4 |~#array~0.base|) (not (< (mod |ULTIMATE.start_main_~i~0#1| 4294967296) 1048576)) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:38:12,561 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:38:12,561 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:38:12,561 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 9] total 18 [2022-11-25 23:38:12,561 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099411471] [2022-11-25 23:38:12,562 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:38:12,562 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-25 23:38:12,562 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:12,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-25 23:38:12,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=333, Unknown=0, NotChecked=0, Total=420 [2022-11-25 23:38:12,564 INFO L87 Difference]: Start difference. First operand 93 states and 113 transitions. Second operand has 18 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 18 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:15,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:15,244 INFO L93 Difference]: Finished difference Result 417 states and 628 transitions. [2022-11-25 23:38:15,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-11-25 23:38:15,247 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 18 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 92 [2022-11-25 23:38:15,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:15,255 INFO L225 Difference]: With dead ends: 417 [2022-11-25 23:38:15,255 INFO L226 Difference]: Without dead ends: 331 [2022-11-25 23:38:15,258 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 241 SyntacticMatches, 20 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 709 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=443, Invalid=1719, Unknown=0, NotChecked=0, Total=2162 [2022-11-25 23:38:15,260 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 33 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 183 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 183 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:15,260 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 22 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 183 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-25 23:38:15,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2022-11-25 23:38:15,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 257. [2022-11-25 23:38:15,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 256 states have (on average 1.34765625) internal successors, (345), 256 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:15,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 345 transitions. [2022-11-25 23:38:15,368 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 345 transitions. Word has length 92 [2022-11-25 23:38:15,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:15,369 INFO L495 AbstractCegarLoop]: Abstraction has 257 states and 345 transitions. [2022-11-25 23:38:15,369 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 18 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:15,369 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 345 transitions. [2022-11-25 23:38:15,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-11-25 23:38:15,378 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:15,378 INFO L195 NwaCegarLoop]: trace histogram [80, 16, 16, 4, 4, 1, 1, 1, 1] [2022-11-25 23:38:15,387 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-25 23:38:15,584 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:15,585 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:15,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:15,585 INFO L85 PathProgramCache]: Analyzing trace with hash -228308688, now seen corresponding path program 4 times [2022-11-25 23:38:15,586 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:15,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1952754350] [2022-11-25 23:38:15,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:15,586 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:15,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:17,238 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 806 proven. 36 refuted. 0 times theorem prover too weak. 3918 trivial. 0 not checked. [2022-11-25 23:38:17,238 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:17,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1952754350] [2022-11-25 23:38:17,239 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1952754350] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:38:17,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1598759839] [2022-11-25 23:38:17,239 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:38:17,239 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:17,239 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:38:17,242 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:38:17,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-25 23:38:17,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:17,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 736 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-25 23:38:17,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:38:17,595 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 1208 proven. 60 refuted. 0 times theorem prover too weak. 3492 trivial. 0 not checked. [2022-11-25 23:38:17,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:38:17,737 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 1233 proven. 10 refuted. 0 times theorem prover too weak. 3517 trivial. 0 not checked. [2022-11-25 23:38:17,737 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1598759839] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:38:17,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1645022540] [2022-11-25 23:38:17,740 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-25 23:38:17,740 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:38:17,740 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:38:17,740 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:38:17,741 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:38:17,762 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2022-11-25 23:38:17,818 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 138 treesize of output 122 [2022-11-25 23:38:18,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:38:18,101 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 527 treesize of output 505 [2022-11-25 23:38:18,191 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:38:18,220 INFO L321 Elim1Store]: treesize reduction 84, result has 55.6 percent of original size [2022-11-25 23:38:18,220 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 177 treesize of output 146 [2022-11-25 23:38:18,438 INFO L321 Elim1Store]: treesize reduction 156, result has 50.2 percent of original size [2022-11-25 23:38:18,439 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2022-11-25 23:38:18,642 INFO L321 Elim1Store]: treesize reduction 156, result has 50.2 percent of original size [2022-11-25 23:38:18,643 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2022-11-25 23:38:18,745 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:38:19,430 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3606#(and (= |ULTIMATE.start_main_~a~0#1| 1) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |~#array~0.offset| 0) (= 4 |~#array~0.base|) (not (< (mod |ULTIMATE.start_main_~i~0#1| 4294967296) 1048576)) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:38:19,430 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:38:19,430 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:38:19,431 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7, 7] total 16 [2022-11-25 23:38:19,431 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009285233] [2022-11-25 23:38:19,431 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:38:19,432 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-25 23:38:19,432 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:19,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-25 23:38:19,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=252, Unknown=0, NotChecked=0, Total=342 [2022-11-25 23:38:19,433 INFO L87 Difference]: Start difference. First operand 257 states and 345 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:19,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:19,940 INFO L93 Difference]: Finished difference Result 514 states and 765 transitions. [2022-11-25 23:38:19,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-25 23:38:19,941 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 124 [2022-11-25 23:38:19,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:19,943 INFO L225 Difference]: With dead ends: 514 [2022-11-25 23:38:19,944 INFO L226 Difference]: Without dead ends: 269 [2022-11-25 23:38:19,948 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 385 GetRequests, 342 SyntacticMatches, 22 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2022-11-25 23:38:19,950 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:19,951 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 22 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:38:19,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2022-11-25 23:38:20,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 269. [2022-11-25 23:38:20,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 269 states, 268 states have (on average 1.078358208955224) internal successors, (289), 268 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:20,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 289 transitions. [2022-11-25 23:38:20,012 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 289 transitions. Word has length 124 [2022-11-25 23:38:20,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:20,014 INFO L495 AbstractCegarLoop]: Abstraction has 269 states and 289 transitions. [2022-11-25 23:38:20,014 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:20,014 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 289 transitions. [2022-11-25 23:38:20,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2022-11-25 23:38:20,024 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:20,024 INFO L195 NwaCegarLoop]: trace histogram [224, 16, 16, 4, 4, 1, 1, 1, 1] [2022-11-25 23:38:20,063 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-11-25 23:38:20,263 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-25 23:38:20,263 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:20,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:20,264 INFO L85 PathProgramCache]: Analyzing trace with hash 1070396208, now seen corresponding path program 5 times [2022-11-25 23:38:20,264 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:20,265 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1437263268] [2022-11-25 23:38:20,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:20,265 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:21,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:25,461 INFO L134 CoverageAnalysis]: Checked inductivity of 28880 backedges. 3398 proven. 105 refuted. 0 times theorem prover too weak. 25377 trivial. 0 not checked. [2022-11-25 23:38:25,462 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:25,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1437263268] [2022-11-25 23:38:25,462 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1437263268] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:38:25,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [639142602] [2022-11-25 23:38:25,462 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:38:25,462 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:25,462 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:38:25,481 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:38:25,500 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-25 23:38:29,409 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2022-11-25 23:38:29,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:38:29,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 33 conjunts are in the unsatisfiable core [2022-11-25 23:38:29,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:38:29,546 INFO L134 CoverageAnalysis]: Checked inductivity of 28880 backedges. 3398 proven. 105 refuted. 0 times theorem prover too weak. 25377 trivial. 0 not checked. [2022-11-25 23:38:29,546 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:38:30,894 INFO L134 CoverageAnalysis]: Checked inductivity of 28880 backedges. 3398 proven. 105 refuted. 0 times theorem prover too weak. 25377 trivial. 0 not checked. [2022-11-25 23:38:30,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [639142602] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:38:30,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1707350225] [2022-11-25 23:38:30,897 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-25 23:38:30,897 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:38:30,899 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:38:30,899 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:38:30,899 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:38:30,913 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2022-11-25 23:38:30,969 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 201 treesize of output 185 [2022-11-25 23:38:31,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:38:31,305 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 615 treesize of output 593 [2022-11-25 23:38:31,434 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:38:31,466 INFO L321 Elim1Store]: treesize reduction 84, result has 55.6 percent of original size [2022-11-25 23:38:31,467 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 177 treesize of output 146 [2022-11-25 23:38:31,658 INFO L321 Elim1Store]: treesize reduction 156, result has 50.2 percent of original size [2022-11-25 23:38:31,659 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2022-11-25 23:38:31,839 INFO L321 Elim1Store]: treesize reduction 156, result has 50.2 percent of original size [2022-11-25 23:38:31,841 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2022-11-25 23:38:31,931 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:38:33,153 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6810#(and (= |ULTIMATE.start_main_~a~0#1| 1) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |~#array~0.offset| 0) (= 4 |~#array~0.base|) (not (< (mod |ULTIMATE.start_main_~i~0#1| 4294967296) 1048576)) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:38:33,153 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:38:33,154 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:38:33,154 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2022-11-25 23:38:33,154 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060173142] [2022-11-25 23:38:33,154 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:38:33,155 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-25 23:38:33,155 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:33,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-25 23:38:33,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=934, Unknown=0, NotChecked=0, Total=1260 [2022-11-25 23:38:33,157 INFO L87 Difference]: Start difference. First operand 269 states and 289 transitions. Second operand has 33 states, 33 states have (on average 1.4545454545454546) internal successors, (48), 33 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:44,545 WARN L233 SmtUtils]: Spent 5.43s on a formula simplification. DAG size of input: 84 DAG size of output: 10 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:39:31,218 WARN L233 SmtUtils]: Spent 22.30s on a formula simplification that was a NOOP. DAG size: 90 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:39:32,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:39:32,332 INFO L93 Difference]: Finished difference Result 776 states and 1071 transitions. [2022-11-25 23:39:32,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-25 23:39:32,334 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.4545454545454546) internal successors, (48), 33 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 268 [2022-11-25 23:39:32,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:39:32,336 INFO L225 Difference]: With dead ends: 776 [2022-11-25 23:39:32,337 INFO L226 Difference]: Without dead ends: 525 [2022-11-25 23:39:32,339 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 835 GetRequests, 765 SyntacticMatches, 21 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 594 ImplicationChecksByTransitivity, 60.0s TimeCoverageRelationStatistics Valid=821, Invalid=1729, Unknown=0, NotChecked=0, Total=2550 [2022-11-25 23:39:32,339 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 70 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 297 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 297 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-11-25 23:39:32,340 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 40 Invalid, 312 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 297 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-11-25 23:39:32,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 525 states. [2022-11-25 23:39:32,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 525 to 525. [2022-11-25 23:39:32,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 525 states, 524 states have (on average 1.0400763358778626) internal successors, (545), 524 states have internal predecessors, (545), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:32,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 525 states to 525 states and 545 transitions. [2022-11-25 23:39:32,432 INFO L78 Accepts]: Start accepts. Automaton has 525 states and 545 transitions. Word has length 268 [2022-11-25 23:39:32,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:39:32,432 INFO L495 AbstractCegarLoop]: Abstraction has 525 states and 545 transitions. [2022-11-25 23:39:32,432 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.4545454545454546) internal successors, (48), 33 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:32,432 INFO L276 IsEmpty]: Start isEmpty. Operand 525 states and 545 transitions. [2022-11-25 23:39:32,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 525 [2022-11-25 23:39:32,443 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:39:32,443 INFO L195 NwaCegarLoop]: trace histogram [480, 16, 16, 4, 4, 1, 1, 1, 1] [2022-11-25 23:39:32,452 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-25 23:39:32,651 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-25 23:39:32,652 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:39:32,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:39:32,652 INFO L85 PathProgramCache]: Analyzing trace with hash 2093093680, now seen corresponding path program 6 times [2022-11-25 23:39:32,652 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:39:32,653 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [30101762] [2022-11-25 23:39:32,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:39:32,653 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:39:35,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:39:45,240 INFO L134 CoverageAnalysis]: Checked inductivity of 122960 backedges. 14438 proven. 465 refuted. 0 times theorem prover too weak. 108057 trivial. 0 not checked. [2022-11-25 23:39:45,241 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:39:45,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [30101762] [2022-11-25 23:39:45,241 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [30101762] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:39:45,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1561911497] [2022-11-25 23:39:45,241 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:39:45,242 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:39:45,242 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:39:45,249 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:39:45,279 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-25 23:39:46,693 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:39:46,693 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:39:46,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 3536 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-25 23:39:46,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:39:47,283 INFO L134 CoverageAnalysis]: Checked inductivity of 122960 backedges. 46207 proven. 5916 refuted. 0 times theorem prover too weak. 70837 trivial. 0 not checked. [2022-11-25 23:39:47,283 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:39:48,190 INFO L134 CoverageAnalysis]: Checked inductivity of 122960 backedges. 46337 proven. 5786 refuted. 0 times theorem prover too weak. 70837 trivial. 0 not checked. [2022-11-25 23:39:48,191 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1561911497] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:39:48,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1992909677] [2022-11-25 23:39:48,193 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-25 23:39:48,193 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:39:48,193 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:39:48,194 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:39:48,194 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:39:48,208 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2022-11-25 23:39:48,264 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 201 treesize of output 185 [2022-11-25 23:39:48,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:39:48,599 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 615 treesize of output 593 [2022-11-25 23:39:48,691 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:39:48,721 INFO L321 Elim1Store]: treesize reduction 84, result has 55.6 percent of original size [2022-11-25 23:39:48,721 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 177 treesize of output 146 [2022-11-25 23:39:48,892 INFO L321 Elim1Store]: treesize reduction 156, result has 50.2 percent of original size [2022-11-25 23:39:48,892 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2022-11-25 23:39:49,070 INFO L321 Elim1Store]: treesize reduction 156, result has 50.2 percent of original size [2022-11-25 23:39:49,071 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2022-11-25 23:39:49,202 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:39:51,231 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12629#(and (= |ULTIMATE.start_main_~a~0#1| 1) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |~#array~0.offset| 0) (= 4 |~#array~0.base|) (not (< (mod |ULTIMATE.start_main_~i~0#1| 4294967296) 1048576)) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:39:51,232 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:39:51,232 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:39:51,232 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 12, 12] total 53 [2022-11-25 23:39:51,232 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726632636] [2022-11-25 23:39:51,233 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:39:51,234 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-11-25 23:39:51,235 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:39:51,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-11-25 23:39:51,236 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=261, Invalid=2819, Unknown=0, NotChecked=0, Total=3080 [2022-11-25 23:39:51,237 INFO L87 Difference]: Start difference. First operand 525 states and 545 transitions. Second operand has 53 states, 53 states have (on average 1.509433962264151) internal successors, (80), 53 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:31,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:40:31,309 INFO L93 Difference]: Finished difference Result 1824 states and 1951 transitions. [2022-11-25 23:40:31,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 327 states. [2022-11-25 23:40:31,309 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.509433962264151) internal successors, (80), 53 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 524 [2022-11-25 23:40:31,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:40:31,314 INFO L225 Difference]: With dead ends: 1824 [2022-11-25 23:40:31,314 INFO L226 Difference]: Without dead ends: 1333 [2022-11-25 23:40:31,337 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1916 GetRequests, 1529 SyntacticMatches, 20 SemanticMatches, 367 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52675 ImplicationChecksByTransitivity, 34.7s TimeCoverageRelationStatistics Valid=7961, Invalid=127831, Unknown=0, NotChecked=0, Total=135792 [2022-11-25 23:40:31,337 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 239 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 5652 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 239 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 5660 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 5652 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:40:31,338 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [239 Valid, 32 Invalid, 5660 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 5652 Invalid, 0 Unknown, 0 Unchecked, 8.4s Time] [2022-11-25 23:40:31,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1333 states. [2022-11-25 23:40:31,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1333 to 1333. [2022-11-25 23:40:31,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1333 states, 1332 states have (on average 1.0337837837837838) internal successors, (1377), 1332 states have internal predecessors, (1377), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:31,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1333 states to 1333 states and 1377 transitions. [2022-11-25 23:40:31,577 INFO L78 Accepts]: Start accepts. Automaton has 1333 states and 1377 transitions. Word has length 524 [2022-11-25 23:40:31,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:40:31,578 INFO L495 AbstractCegarLoop]: Abstraction has 1333 states and 1377 transitions. [2022-11-25 23:40:31,578 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.509433962264151) internal successors, (80), 53 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:31,578 INFO L276 IsEmpty]: Start isEmpty. Operand 1333 states and 1377 transitions. [2022-11-25 23:40:31,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1333 [2022-11-25 23:40:31,638 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:40:31,639 INFO L195 NwaCegarLoop]: trace histogram [1240, 40, 40, 4, 4, 1, 1, 1, 1] [2022-11-25 23:40:31,655 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-25 23:40:31,855 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:31,855 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:40:31,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:40:31,855 INFO L85 PathProgramCache]: Analyzing trace with hash 1380387248, now seen corresponding path program 7 times [2022-11-25 23:40:31,856 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:40:31,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1354437628] [2022-11-25 23:40:31,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:31,856 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:40:43,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:41:06,350 INFO L134 CoverageAnalysis]: Checked inductivity of 819516 backedges. 39983 proven. 496 refuted. 0 times theorem prover too weak. 779037 trivial. 0 not checked. [2022-11-25 23:41:06,350 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:41:06,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1354437628] [2022-11-25 23:41:06,351 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1354437628] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:41:06,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1091604074] [2022-11-25 23:41:06,351 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:41:06,351 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:41:06,351 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:41:06,352 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:41:06,356 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-25 23:41:09,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:41:10,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 9000 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-25 23:41:10,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:41:11,432 INFO L134 CoverageAnalysis]: Checked inductivity of 819516 backedges. 307567 proven. 46421 refuted. 0 times theorem prover too weak. 465528 trivial. 0 not checked. [2022-11-25 23:41:11,432 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:41:13,771 INFO L134 CoverageAnalysis]: Checked inductivity of 819516 backedges. 307798 proven. 46190 refuted. 0 times theorem prover too weak. 465528 trivial. 0 not checked. [2022-11-25 23:41:13,771 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1091604074] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:41:13,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1332809244] [2022-11-25 23:41:13,773 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-25 23:41:13,773 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:41:13,774 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:41:13,774 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:41:13,774 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:41:13,788 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2022-11-25 23:41:13,835 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 138 treesize of output 122 [2022-11-25 23:41:14,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:41:14,111 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 527 treesize of output 505 [2022-11-25 23:41:14,207 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:41:14,238 INFO L321 Elim1Store]: treesize reduction 84, result has 55.6 percent of original size [2022-11-25 23:41:14,239 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 177 treesize of output 146 [2022-11-25 23:41:14,388 INFO L321 Elim1Store]: treesize reduction 156, result has 50.2 percent of original size [2022-11-25 23:41:14,388 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2022-11-25 23:41:14,547 INFO L321 Elim1Store]: treesize reduction 156, result has 50.2 percent of original size [2022-11-25 23:41:14,548 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2022-11-25 23:41:14,648 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:41:20,163 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27628#(and (= |ULTIMATE.start_main_~a~0#1| 1) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |~#array~0.offset| 0) (= 4 |~#array~0.base|) (not (< (mod |ULTIMATE.start_main_~i~0#1| 4294967296) 1048576)) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:41:20,163 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:41:20,163 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:41:20,163 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 24, 24] total 78 [2022-11-25 23:41:20,164 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092215776] [2022-11-25 23:41:20,164 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:41:20,166 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 78 states [2022-11-25 23:41:20,166 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:41:20,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2022-11-25 23:41:20,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=720, Invalid=5760, Unknown=0, NotChecked=0, Total=6480 [2022-11-25 23:41:20,168 INFO L87 Difference]: Start difference. First operand 1333 states and 1377 transitions. Second operand has 78 states, 78 states have (on average 1.6538461538461537) internal successors, (129), 78 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:51:19,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:51:19,364 INFO L93 Difference]: Finished difference Result 4303 states and 4574 transitions. [2022-11-25 23:51:19,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 739 states. [2022-11-25 23:51:19,365 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 78 states have (on average 1.6538461538461537) internal successors, (129), 78 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 1332 [2022-11-25 23:51:19,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:51:19,375 INFO L225 Difference]: With dead ends: 4303 [2022-11-25 23:51:19,375 INFO L226 Difference]: Without dead ends: 3005 [2022-11-25 23:51:19,427 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4741 GetRequests, 3905 SyntacticMatches, 44 SemanticMatches, 792 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 272346 ImplicationChecksByTransitivity, 582.7s TimeCoverageRelationStatistics Valid=35213, Invalid=594429, Unknown=0, NotChecked=0, Total=629642 [2022-11-25 23:51:19,428 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 417 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 17516 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 417 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 17533 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 17516 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.7s IncrementalHoareTripleChecker+Time [2022-11-25 23:51:19,428 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [417 Valid, 140 Invalid, 17533 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [17 Valid, 17516 Invalid, 0 Unknown, 0 Unchecked, 23.7s Time] [2022-11-25 23:51:19,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3005 states. [2022-11-25 23:51:20,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3005 to 3005. [2022-11-25 23:51:20,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3005 states, 3004 states have (on average 1.030958721704394) internal successors, (3097), 3004 states have internal predecessors, (3097), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:51:20,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3005 states to 3005 states and 3097 transitions. [2022-11-25 23:51:20,195 INFO L78 Accepts]: Start accepts. Automaton has 3005 states and 3097 transitions. Word has length 1332 [2022-11-25 23:51:20,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:51:20,196 INFO L495 AbstractCegarLoop]: Abstraction has 3005 states and 3097 transitions. [2022-11-25 23:51:20,196 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 78 states, 78 states have (on average 1.6538461538461537) internal successors, (129), 78 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:51:20,196 INFO L276 IsEmpty]: Start isEmpty. Operand 3005 states and 3097 transitions. [2022-11-25 23:51:20,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3005 [2022-11-25 23:51:20,263 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:51:20,264 INFO L195 NwaCegarLoop]: trace histogram [2816, 88, 88, 4, 4, 1, 1, 1, 1] [2022-11-25 23:51:20,315 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-25 23:51:20,479 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e56af4aa-cff5-4ba5-a034-2d8563821b67/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-25 23:51:20,479 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:51:20,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:51:20,480 INFO L85 PathProgramCache]: Analyzing trace with hash 1056759408, now seen corresponding path program 8 times [2022-11-25 23:51:20,480 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:51:20,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [985406276] [2022-11-25 23:51:20,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:51:20,480 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:52:21,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat