./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-tiling/nr2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-tiling/nr2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire --witnessprinter.witness.filename witness --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 2a5d4c3d8db636946363c81d25b5c2e381fc236cdcde6b4765d7ce6e059d8a21 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 20:33:49,334 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 20:33:49,433 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 20:33:49,440 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 20:33:49,440 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 20:33:49,465 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 20:33:49,466 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 20:33:49,466 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 20:33:49,467 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 20:33:49,468 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 20:33:49,468 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 20:33:49,469 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 20:33:49,469 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 20:33:49,470 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 20:33:49,470 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 20:33:49,471 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 20:33:49,471 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 20:33:49,472 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 20:33:49,472 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 20:33:49,473 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 20:33:49,473 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 20:33:49,474 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 20:33:49,475 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 20:33:49,475 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 20:33:49,476 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 20:33:49,476 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 20:33:49,494 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 20:33:49,495 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 20:33:49,495 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 20:33:49,495 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 20:33:49,496 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 20:33:49,496 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 20:33:49,496 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 20:33:49,497 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 20:33:49,497 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 20:33:49,497 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 20:33:49,498 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 20:33:49,498 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:33:49,498 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 20:33:49,498 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 20:33:49,499 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 20:33:49,499 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 20:33:49,499 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 20:33:49,500 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 20:33:49,500 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 20:33:49,500 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 20:33:49,501 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 20:33:49,501 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2a5d4c3d8db636946363c81d25b5c2e381fc236cdcde6b4765d7ce6e059d8a21 [2023-11-23 20:33:49,842 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 20:33:49,875 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 20:33:49,878 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 20:33:49,880 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 20:33:49,881 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 20:33:49,882 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/array-tiling/nr2.c [2023-11-23 20:33:53,084 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 20:33:53,329 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 20:33:53,330 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/sv-benchmarks/c/array-tiling/nr2.c [2023-11-23 20:33:53,340 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/data/ea6bc1255/a23c23abb6dc46bba5a60291aa473315/FLAGadf646292 [2023-11-23 20:33:53,358 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/data/ea6bc1255/a23c23abb6dc46bba5a60291aa473315 [2023-11-23 20:33:53,365 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 20:33:53,367 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 20:33:53,369 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 20:33:53,369 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 20:33:53,375 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 20:33:53,376 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:33:53" (1/1) ... [2023-11-23 20:33:53,377 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@26d30349 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:53, skipping insertion in model container [2023-11-23 20:33:53,378 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:33:53" (1/1) ... [2023-11-23 20:33:53,407 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 20:33:53,594 WARN L240 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_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/sv-benchmarks/c/array-tiling/nr2.c[394,407] [2023-11-23 20:33:53,616 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:33:53,627 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 20:33:53,641 WARN L240 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_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/sv-benchmarks/c/array-tiling/nr2.c[394,407] [2023-11-23 20:33:53,651 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:33:53,667 INFO L206 MainTranslator]: Completed translation [2023-11-23 20:33:53,668 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:53 WrapperNode [2023-11-23 20:33:53,668 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 20:33:53,669 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 20:33:53,669 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 20:33:53,670 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 20:33:53,678 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:53" (1/1) ... [2023-11-23 20:33:53,686 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:53" (1/1) ... [2023-11-23 20:33:53,715 INFO L138 Inliner]: procedures = 15, calls = 22, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 81 [2023-11-23 20:33:53,717 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 20:33:53,718 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 20:33:53,718 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 20:33:53,719 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 20:33:53,727 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:53" (1/1) ... [2023-11-23 20:33:53,728 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:53" (1/1) ... [2023-11-23 20:33:53,730 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:53" (1/1) ... [2023-11-23 20:33:53,730 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:53" (1/1) ... [2023-11-23 20:33:53,737 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:53" (1/1) ... [2023-11-23 20:33:53,741 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:53" (1/1) ... [2023-11-23 20:33:53,742 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:53" (1/1) ... [2023-11-23 20:33:53,744 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:53" (1/1) ... [2023-11-23 20:33:53,746 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 20:33:53,747 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 20:33:53,747 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 20:33:53,748 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 20:33:53,749 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:53" (1/1) ... [2023-11-23 20:33:53,755 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:33:53,772 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:33:53,785 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 20:33:53,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 20:33:53,830 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 20:33:53,830 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 20:33:53,830 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 20:33:53,831 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 20:33:53,833 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 20:33:53,833 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 20:33:53,834 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-23 20:33:53,834 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 20:33:53,934 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 20:33:53,937 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 20:33:54,182 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 20:33:54,279 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 20:33:54,286 INFO L309 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-23 20:33:54,288 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:33:54 BoogieIcfgContainer [2023-11-23 20:33:54,288 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 20:33:54,292 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 20:33:54,292 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 20:33:54,306 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 20:33:54,306 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 08:33:53" (1/3) ... [2023-11-23 20:33:54,307 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5300aeba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:33:54, skipping insertion in model container [2023-11-23 20:33:54,307 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:53" (2/3) ... [2023-11-23 20:33:54,308 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5300aeba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:33:54, skipping insertion in model container [2023-11-23 20:33:54,308 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:33:54" (3/3) ... [2023-11-23 20:33:54,309 INFO L112 eAbstractionObserver]: Analyzing ICFG nr2.c [2023-11-23 20:33:54,329 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 20:33:54,329 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 20:33:54,384 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 20:33:54,391 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=LoopHeads, 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;@4cf46313, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 20:33:54,391 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 20:33:54,397 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 12 states have internal predecessors, (18), 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) [2023-11-23 20:33:54,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-23 20:33:54,406 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:33:54,407 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:33:54,408 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:33:54,417 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:33:54,418 INFO L85 PathProgramCache]: Analyzing trace with hash 1877224626, now seen corresponding path program 1 times [2023-11-23 20:33:54,429 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:33:54,430 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1897672692] [2023-11-23 20:33:54,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:33:54,431 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:33:54,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:33:55,254 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:33:55,254 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:33:55,255 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1897672692] [2023-11-23 20:33:55,256 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1897672692] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:33:55,256 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:33:55,256 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 20:33:55,258 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582738911] [2023-11-23 20:33:55,259 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:33:55,264 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 20:33:55,265 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:33:55,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 20:33:55,314 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 20:33:55,317 INFO L87 Difference]: Start difference. First operand has 13 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 12 states have internal predecessors, (18), 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 4 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 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) [2023-11-23 20:33:55,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:33:55,431 INFO L93 Difference]: Finished difference Result 26 states and 33 transitions. [2023-11-23 20:33:55,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 20:33:55,435 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 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 7 [2023-11-23 20:33:55,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:33:55,444 INFO L225 Difference]: With dead ends: 26 [2023-11-23 20:33:55,445 INFO L226 Difference]: Without dead ends: 12 [2023-11-23 20:33:55,447 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 20:33:55,451 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 18 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:33:55,453 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 12 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:33:55,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2023-11-23 20:33:55,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 11. [2023-11-23 20:33:55,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 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) [2023-11-23 20:33:55,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 13 transitions. [2023-11-23 20:33:55,491 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 13 transitions. Word has length 7 [2023-11-23 20:33:55,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:33:55,492 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 13 transitions. [2023-11-23 20:33:55,492 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 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) [2023-11-23 20:33:55,493 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 13 transitions. [2023-11-23 20:33:55,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-23 20:33:55,495 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:33:55,495 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:33:55,495 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 20:33:55,496 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:33:55,496 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:33:55,497 INFO L85 PathProgramCache]: Analyzing trace with hash -1841481375, now seen corresponding path program 1 times [2023-11-23 20:33:55,497 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:33:55,497 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2040784923] [2023-11-23 20:33:55,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:33:55,498 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:33:55,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:33:55,574 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:33:55,574 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:33:55,574 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2040784923] [2023-11-23 20:33:55,575 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2040784923] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:33:55,575 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:33:55,575 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 20:33:55,576 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617680595] [2023-11-23 20:33:55,576 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:33:55,577 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:33:55,578 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:33:55,578 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:33:55,579 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:33:55,579 INFO L87 Difference]: Start difference. First operand 11 states and 13 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 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) [2023-11-23 20:33:55,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:33:55,611 INFO L93 Difference]: Finished difference Result 19 states and 24 transitions. [2023-11-23 20:33:55,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:33:55,612 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 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 [2023-11-23 20:33:55,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:33:55,612 INFO L225 Difference]: With dead ends: 19 [2023-11-23 20:33:55,613 INFO L226 Difference]: Without dead ends: 12 [2023-11-23 20:33:55,613 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 [2023-11-23 20:33:55,615 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:33:55,616 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 20:33:55,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2023-11-23 20:33:55,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2023-11-23 20:33:55,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 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) [2023-11-23 20:33:55,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2023-11-23 20:33:55,625 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 9 [2023-11-23 20:33:55,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:33:55,625 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2023-11-23 20:33:55,625 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 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) [2023-11-23 20:33:55,626 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2023-11-23 20:33:55,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-23 20:33:55,627 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:33:55,627 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:33:55,627 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 20:33:55,627 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:33:55,628 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:33:55,628 INFO L85 PathProgramCache]: Analyzing trace with hash -1356688747, now seen corresponding path program 1 times [2023-11-23 20:33:55,629 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:33:55,629 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1605539084] [2023-11-23 20:33:55,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:33:55,630 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:33:55,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:33:55,715 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:33:55,716 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:33:55,716 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1605539084] [2023-11-23 20:33:55,716 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1605539084] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:33:55,717 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1548783675] [2023-11-23 20:33:55,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:33:55,717 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:33:55,718 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:33:55,720 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:33:55,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 20:33:55,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:33:55,832 INFO L262 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-23 20:33:55,837 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:33:55,894 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:33:55,895 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:33:55,919 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:33:55,922 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1548783675] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:33:55,927 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [182702761] [2023-11-23 20:33:55,960 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-23 20:33:55,960 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:33:55,964 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:33:55,971 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:33:55,973 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:33:57,432 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:33:58,461 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '173#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 ~CELLCOUNT~0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-23 20:33:58,461 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:33:58,462 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:33:58,462 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 5 [2023-11-23 20:33:58,462 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220006812] [2023-11-23 20:33:58,462 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:33:58,463 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 20:33:58,463 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:33:58,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 20:33:58,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2023-11-23 20:33:58,465 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 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) [2023-11-23 20:33:58,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:33:58,502 INFO L93 Difference]: Finished difference Result 21 states and 26 transitions. [2023-11-23 20:33:58,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 20:33:58,503 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 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) Word has length 10 [2023-11-23 20:33:58,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:33:58,504 INFO L225 Difference]: With dead ends: 21 [2023-11-23 20:33:58,504 INFO L226 Difference]: Without dead ends: 13 [2023-11-23 20:33:58,505 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2023-11-23 20:33:58,506 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:33:58,507 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 11 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 20:33:58,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2023-11-23 20:33:58,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2023-11-23 20:33:58,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 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) [2023-11-23 20:33:58,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2023-11-23 20:33:58,512 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 10 [2023-11-23 20:33:58,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:33:58,513 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2023-11-23 20:33:58,513 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 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) [2023-11-23 20:33:58,513 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2023-11-23 20:33:58,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-23 20:33:58,514 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:33:58,514 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:33:58,540 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 20:33:58,728 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:33:58,729 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:33:58,729 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:33:58,729 INFO L85 PathProgramCache]: Analyzing trace with hash 786980833, now seen corresponding path program 2 times [2023-11-23 20:33:58,729 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:33:58,730 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1184714351] [2023-11-23 20:33:58,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:33:58,730 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:33:58,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:33:59,442 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:33:59,443 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:33:59,445 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1184714351] [2023-11-23 20:33:59,446 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1184714351] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:33:59,446 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [475587847] [2023-11-23 20:33:59,446 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 20:33:59,448 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:33:59,448 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:33:59,450 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:33:59,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 20:33:59,532 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-23 20:33:59,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 20:33:59,534 INFO L262 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 24 conjunts are in the unsatisfiable core [2023-11-23 20:33:59,542 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:33:59,605 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-23 20:33:59,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 20:33:59,649 INFO L378 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 23 treesize of output 22 [2023-11-23 20:33:59,803 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:33:59,803 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:33:59,930 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-23 20:33:59,998 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 20:33:59,999 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2023-11-23 20:34:00,020 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 20:34:00,020 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 15 [2023-11-23 20:34:00,086 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 100 treesize of output 86 [2023-11-23 20:34:00,093 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 102 treesize of output 96 [2023-11-23 20:34:00,109 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 20:34:00,110 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 104 treesize of output 101 [2023-11-23 20:34:00,119 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 71 treesize of output 67 [2023-11-23 20:34:00,236 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:34:00,237 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [475587847] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:34:00,237 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [529333959] [2023-11-23 20:34:00,240 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-23 20:34:00,240 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:34:00,240 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:34:00,241 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:34:00,241 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:34:00,945 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:34:02,004 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '310#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 ~CELLCOUNT~0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-23 20:34:02,004 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:34:02,004 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:34:02,004 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 20 [2023-11-23 20:34:02,005 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1986121390] [2023-11-23 20:34:02,005 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:34:02,005 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-11-23 20:34:02,005 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:02,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-11-23 20:34:02,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=588, Unknown=0, NotChecked=0, Total=702 [2023-11-23 20:34:02,007 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 20 states, 20 states have (on average 1.25) internal successors, (25), 20 states have internal predecessors, (25), 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) [2023-11-23 20:34:02,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:02,692 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2023-11-23 20:34:02,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-11-23 20:34:02,693 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.25) internal successors, (25), 20 states have internal predecessors, (25), 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 11 [2023-11-23 20:34:02,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:02,694 INFO L225 Difference]: With dead ends: 36 [2023-11-23 20:34:02,694 INFO L226 Difference]: Without dead ends: 34 [2023-11-23 20:34:02,695 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 403 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=277, Invalid=1205, Unknown=0, NotChecked=0, Total=1482 [2023-11-23 20:34:02,696 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 87 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:02,696 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 27 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:34:02,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-11-23 20:34:02,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 15. [2023-11-23 20:34:02,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 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) [2023-11-23 20:34:02,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2023-11-23 20:34:02,705 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 11 [2023-11-23 20:34:02,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:02,705 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2023-11-23 20:34:02,706 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.25) internal successors, (25), 20 states have internal predecessors, (25), 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) [2023-11-23 20:34:02,706 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2023-11-23 20:34:02,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-23 20:34:02,706 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:02,707 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:02,733 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 20:34:02,920 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:02,921 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:02,921 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:02,921 INFO L85 PathProgramCache]: Analyzing trace with hash -1275134414, now seen corresponding path program 1 times [2023-11-23 20:34:02,921 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:02,922 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1475450498] [2023-11-23 20:34:02,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:02,922 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:02,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:03,452 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:34:03,453 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:03,453 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1475450498] [2023-11-23 20:34:03,453 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1475450498] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:34:03,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1288118669] [2023-11-23 20:34:03,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:03,460 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:03,461 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:34:03,462 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:34:03,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 20:34:03,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:03,533 INFO L262 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-23 20:34:03,535 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:34:03,597 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-23 20:34:03,734 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:34:03,734 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:34:03,820 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 20:34:03,820 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2023-11-23 20:34:03,830 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 20:34:03,831 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 15 [2023-11-23 20:34:03,865 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-11-23 20:34:03,875 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 20:34:03,876 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 26 [2023-11-23 20:34:03,936 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:34:03,936 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1288118669] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:34:03,937 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [433963032] [2023-11-23 20:34:03,944 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-23 20:34:03,945 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:34:03,945 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:34:03,945 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:34:03,946 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:34:04,698 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:34:05,808 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '515#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 ~CELLCOUNT~0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-11-23 20:34:05,808 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:34:05,809 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:34:05,809 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 23 [2023-11-23 20:34:05,809 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612280875] [2023-11-23 20:34:05,809 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:34:05,809 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-23 20:34:05,810 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:05,810 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-23 20:34:05,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=802, Unknown=0, NotChecked=0, Total=930 [2023-11-23 20:34:05,811 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 23 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 23 states have internal predecessors, (35), 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) [2023-11-23 20:34:06,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:06,052 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2023-11-23 20:34:06,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-23 20:34:06,052 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 23 states have internal predecessors, (35), 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 14 [2023-11-23 20:34:06,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:06,053 INFO L225 Difference]: With dead ends: 33 [2023-11-23 20:34:06,053 INFO L226 Difference]: Without dead ends: 31 [2023-11-23 20:34:06,054 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 507 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=171, Invalid=1019, Unknown=0, NotChecked=0, Total=1190 [2023-11-23 20:34:06,055 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 32 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 168 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:06,055 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 40 Invalid, 168 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 164 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:34:06,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-11-23 20:34:06,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 22. [2023-11-23 20:34:06,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 21 states have internal predecessors, (26), 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) [2023-11-23 20:34:06,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2023-11-23 20:34:06,067 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 14 [2023-11-23 20:34:06,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:06,067 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2023-11-23 20:34:06,068 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 23 states have internal predecessors, (35), 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) [2023-11-23 20:34:06,068 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2023-11-23 20:34:06,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-23 20:34:06,069 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:06,069 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:06,096 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-11-23 20:34:06,288 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:06,289 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:06,289 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:06,289 INFO L85 PathProgramCache]: Analyzing trace with hash 1461744193, now seen corresponding path program 2 times [2023-11-23 20:34:06,289 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:06,289 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [555242100] [2023-11-23 20:34:06,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:06,290 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:06,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:06,599 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 20:34:06,599 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:06,599 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [555242100] [2023-11-23 20:34:06,599 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [555242100] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:34:06,600 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [967728858] [2023-11-23 20:34:06,600 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 20:34:06,600 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:06,600 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:34:06,601 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:34:06,621 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 20:34:06,673 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-23 20:34:06,673 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 20:34:06,675 INFO L262 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-23 20:34:06,676 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:34:06,856 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 20:34:06,856 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:34:07,001 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 20:34:07,002 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [967728858] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:34:07,002 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1923339156] [2023-11-23 20:34:07,006 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-23 20:34:07,007 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:34:07,007 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:34:07,007 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:34:07,008 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:34:07,634 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:34:08,841 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '726#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 ~CELLCOUNT~0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-11-23 20:34:08,841 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:34:08,841 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:34:08,841 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 17 [2023-11-23 20:34:08,842 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694253782] [2023-11-23 20:34:08,842 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:34:08,842 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-23 20:34:08,842 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:08,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-23 20:34:08,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=503, Unknown=0, NotChecked=0, Total=600 [2023-11-23 20:34:08,844 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 17 states have internal predecessors, (41), 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) [2023-11-23 20:34:09,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:09,137 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2023-11-23 20:34:09,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-23 20:34:09,138 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 17 states have internal predecessors, (41), 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 17 [2023-11-23 20:34:09,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:09,139 INFO L225 Difference]: With dead ends: 40 [2023-11-23 20:34:09,139 INFO L226 Difference]: Without dead ends: 28 [2023-11-23 20:34:09,140 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=174, Invalid=818, Unknown=0, NotChecked=0, Total=992 [2023-11-23 20:34:09,140 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 48 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:09,141 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 30 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:34:09,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-11-23 20:34:09,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 19. [2023-11-23 20:34:09,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 18 states have internal predecessors, (22), 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) [2023-11-23 20:34:09,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2023-11-23 20:34:09,151 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 17 [2023-11-23 20:34:09,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:09,151 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2023-11-23 20:34:09,152 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 17 states have internal predecessors, (41), 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) [2023-11-23 20:34:09,152 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2023-11-23 20:34:09,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-23 20:34:09,153 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:09,153 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:09,176 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 20:34:09,374 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-23 20:34:09,375 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:09,375 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:09,375 INFO L85 PathProgramCache]: Analyzing trace with hash -1228756957, now seen corresponding path program 3 times [2023-11-23 20:34:09,375 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:09,375 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1120053147] [2023-11-23 20:34:09,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:09,376 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:09,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:10,296 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:34:10,297 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:10,297 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1120053147] [2023-11-23 20:34:10,297 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1120053147] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:34:10,298 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [849353066] [2023-11-23 20:34:10,298 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 20:34:10,298 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:10,298 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:34:10,300 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:34:10,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 20:34:10,387 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 20:34:10,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 20:34:10,389 INFO L262 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 30 conjunts are in the unsatisfiable core [2023-11-23 20:34:10,394 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:34:10,449 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-23 20:34:10,459 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-23 20:34:10,601 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 69 treesize of output 81 [2023-11-23 20:34:10,637 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 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 24 treesize of output 13 [2023-11-23 20:34:10,663 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 63 treesize of output 47 [2023-11-23 20:34:10,670 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 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 47 treesize of output 28 [2023-11-23 20:34:10,786 INFO L349 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2023-11-23 20:34:10,787 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 108 treesize of output 120 [2023-11-23 20:34:10,834 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 108 treesize of output 90 [2023-11-23 20:34:10,841 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 20:34:10,842 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 90 treesize of output 58 [2023-11-23 20:34:10,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 20:34:10,905 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 10 [2023-11-23 20:34:13,714 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 20:34:13,715 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 163 treesize of output 151 [2023-11-23 20:34:13,808 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:34:13,809 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:34:14,366 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 20:34:14,367 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 49 treesize of output 59 [2023-11-23 20:34:14,423 INFO L349 Elim1Store]: treesize reduction 5, result has 58.3 percent of original size [2023-11-23 20:34:14,424 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 31 [2023-11-23 20:34:14,435 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 4 [2023-11-23 20:34:14,491 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 20:34:14,492 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [849353066] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:34:14,492 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [563284004] [2023-11-23 20:34:14,495 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-23 20:34:14,496 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:34:14,496 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:34:14,497 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:34:14,497 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:34:15,099 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:34:16,426 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '971#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 ~CELLCOUNT~0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-11-23 20:34:16,426 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:34:16,426 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:34:16,426 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 12] total 32 [2023-11-23 20:34:16,427 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32593193] [2023-11-23 20:34:16,427 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:34:16,427 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-11-23 20:34:16,427 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:16,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-11-23 20:34:16,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=1355, Unknown=1, NotChecked=0, Total=1560 [2023-11-23 20:34:16,429 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 32 states, 32 states have (on average 1.46875) internal successors, (47), 32 states have internal predecessors, (47), 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) [2023-11-23 20:34:17,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:17,533 INFO L93 Difference]: Finished difference Result 42 states and 48 transitions. [2023-11-23 20:34:17,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-11-23 20:34:17,534 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.46875) internal successors, (47), 32 states have internal predecessors, (47), 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 18 [2023-11-23 20:34:17,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:17,535 INFO L225 Difference]: With dead ends: 42 [2023-11-23 20:34:17,535 INFO L226 Difference]: Without dead ends: 40 [2023-11-23 20:34:17,536 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1048 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=412, Invalid=2557, Unknown=1, NotChecked=0, Total=2970 [2023-11-23 20:34:17,537 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 60 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 418 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 430 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 418 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:17,538 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 74 Invalid, 430 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 418 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 20:34:17,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2023-11-23 20:34:17,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 22. [2023-11-23 20:34:17,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 21 states have internal predecessors, (25), 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) [2023-11-23 20:34:17,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2023-11-23 20:34:17,549 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 18 [2023-11-23 20:34:17,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:17,549 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2023-11-23 20:34:17,550 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.46875) internal successors, (47), 32 states have internal predecessors, (47), 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) [2023-11-23 20:34:17,550 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2023-11-23 20:34:17,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-23 20:34:17,550 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:17,551 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:17,580 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 20:34:17,764 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-23 20:34:17,765 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:17,765 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:17,765 INFO L85 PathProgramCache]: Analyzing trace with hash 113096368, now seen corresponding path program 4 times [2023-11-23 20:34:17,765 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:17,765 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [368199222] [2023-11-23 20:34:17,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:17,765 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:17,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:18,306 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 20:34:18,307 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:18,307 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [368199222] [2023-11-23 20:34:18,307 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [368199222] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:34:18,307 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1066418660] [2023-11-23 20:34:18,307 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-23 20:34:18,307 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:18,308 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:34:18,309 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:34:18,325 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 20:34:18,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:18,394 INFO L262 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 30 conjunts are in the unsatisfiable core [2023-11-23 20:34:18,398 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:34:18,529 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-23 20:34:18,568 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 20:34:18,569 INFO L378 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 23 treesize of output 22 [2023-11-23 20:34:18,902 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 20:34:18,902 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:34:19,086 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2023-11-23 20:34:19,144 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 20:34:19,144 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2023-11-23 20:34:19,158 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 20:34:19,159 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 15 [2023-11-23 20:34:19,198 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 123 treesize of output 108 [2023-11-23 20:34:19,211 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 94 treesize of output 90 [2023-11-23 20:34:19,222 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 20:34:19,226 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 120 treesize of output 115 [2023-11-23 20:34:19,234 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 85 treesize of output 77 [2023-11-23 20:34:19,316 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 20:34:19,316 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1066418660] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:34:19,316 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [66893381] [2023-11-23 20:34:19,318 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-23 20:34:19,318 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:34:19,319 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:34:19,319 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:34:19,319 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:34:19,798 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:34:20,954 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1254#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 ~CELLCOUNT~0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-11-23 20:34:20,954 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:34:20,954 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:34:20,954 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 28 [2023-11-23 20:34:20,954 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554750046] [2023-11-23 20:34:20,955 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:34:20,955 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-11-23 20:34:20,955 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:20,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-11-23 20:34:20,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=1107, Unknown=0, NotChecked=0, Total=1260 [2023-11-23 20:34:20,957 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand has 28 states, 28 states have (on average 1.7857142857142858) internal successors, (50), 28 states have internal predecessors, (50), 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) [2023-11-23 20:34:22,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:22,273 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2023-11-23 20:34:22,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-11-23 20:34:22,273 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.7857142857142858) internal successors, (50), 28 states have internal predecessors, (50), 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 21 [2023-11-23 20:34:22,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:22,274 INFO L225 Difference]: With dead ends: 49 [2023-11-23 20:34:22,274 INFO L226 Difference]: Without dead ends: 47 [2023-11-23 20:34:22,277 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 861 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=468, Invalid=2838, Unknown=0, NotChecked=0, Total=3306 [2023-11-23 20:34:22,277 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 109 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 302 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:22,278 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [109 Valid, 61 Invalid, 333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 302 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-23 20:34:22,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2023-11-23 20:34:22,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 25. [2023-11-23 20:34:22,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.1666666666666667) internal successors, (28), 24 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) [2023-11-23 20:34:22,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2023-11-23 20:34:22,309 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 21 [2023-11-23 20:34:22,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:22,309 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2023-11-23 20:34:22,309 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.7857142857142858) internal successors, (50), 28 states have internal predecessors, (50), 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) [2023-11-23 20:34:22,310 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2023-11-23 20:34:22,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-23 20:34:22,311 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:22,311 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:22,339 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-23 20:34:22,524 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-23 20:34:22,525 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:22,525 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:22,525 INFO L85 PathProgramCache]: Analyzing trace with hash 2004877571, now seen corresponding path program 5 times [2023-11-23 20:34:22,525 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:22,525 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1800660798] [2023-11-23 20:34:22,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:22,526 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:22,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:23,132 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 20:34:23,132 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:23,133 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1800660798] [2023-11-23 20:34:23,133 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1800660798] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:34:23,133 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1950881324] [2023-11-23 20:34:23,133 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 20:34:23,133 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:23,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:34:23,135 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:34:23,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 20:34:23,245 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-11-23 20:34:23,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 20:34:23,247 INFO L262 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-23 20:34:23,250 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:34:23,326 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 44 [2023-11-23 20:34:23,333 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 12 [2023-11-23 20:34:23,347 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-23 20:34:23,365 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 3 [2023-11-23 20:34:23,574 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 20:34:23,575 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:34:23,740 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 20:34:23,740 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 33 treesize of output 47 [2023-11-23 20:34:23,747 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 20:34:23,748 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 13 [2023-11-23 20:34:23,766 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 25 [2023-11-23 20:34:23,797 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-11-23 20:34:23,806 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 20:34:23,807 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 20 [2023-11-23 20:34:23,836 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 20:34:23,836 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1950881324] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:34:23,837 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [985682892] [2023-11-23 20:34:23,839 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-23 20:34:23,839 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:34:23,839 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:34:23,839 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:34:23,840 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:34:24,319 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:34:25,291 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1583#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 ~CELLCOUNT~0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-11-23 20:34:25,291 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:34:25,291 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:34:25,291 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 28 [2023-11-23 20:34:25,291 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469681183] [2023-11-23 20:34:25,291 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:34:25,292 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-11-23 20:34:25,292 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:25,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-11-23 20:34:25,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=1110, Unknown=0, NotChecked=0, Total=1260 [2023-11-23 20:34:25,294 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 28 states, 28 states have (on average 2.0357142857142856) internal successors, (57), 28 states have internal predecessors, (57), 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) [2023-11-23 20:34:26,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:26,099 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2023-11-23 20:34:26,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-11-23 20:34:26,099 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.0357142857142856) internal successors, (57), 28 states have internal predecessors, (57), 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 24 [2023-11-23 20:34:26,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:26,100 INFO L225 Difference]: With dead ends: 50 [2023-11-23 20:34:26,101 INFO L226 Difference]: Without dead ends: 48 [2023-11-23 20:34:26,102 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 776 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=333, Invalid=2117, Unknown=0, NotChecked=0, Total=2450 [2023-11-23 20:34:26,103 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 59 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 302 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 313 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:26,104 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 65 Invalid, 313 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 302 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:34:26,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2023-11-23 20:34:26,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 32. [2023-11-23 20:34:26,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.1935483870967742) internal successors, (37), 31 states have internal predecessors, (37), 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) [2023-11-23 20:34:26,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 37 transitions. [2023-11-23 20:34:26,131 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 37 transitions. Word has length 24 [2023-11-23 20:34:26,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:26,131 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 37 transitions. [2023-11-23 20:34:26,132 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.0357142857142856) internal successors, (57), 28 states have internal predecessors, (57), 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) [2023-11-23 20:34:26,132 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 37 transitions. [2023-11-23 20:34:26,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-23 20:34:26,133 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:26,133 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:26,159 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-23 20:34:26,354 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:26,355 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:26,355 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:26,355 INFO L85 PathProgramCache]: Analyzing trace with hash 1497838032, now seen corresponding path program 6 times [2023-11-23 20:34:26,355 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:26,355 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [57238327] [2023-11-23 20:34:26,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:26,356 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:26,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:26,800 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 16 proven. 22 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 20:34:26,800 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:26,800 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [57238327] [2023-11-23 20:34:26,801 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [57238327] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:34:26,801 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1720388170] [2023-11-23 20:34:26,801 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 20:34:26,801 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:26,802 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:34:26,803 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:34:26,840 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-23 20:34:26,921 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 20:34:26,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 20:34:26,923 INFO L262 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-23 20:34:26,929 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:34:27,225 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 26 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 20:34:27,225 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:34:27,418 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 26 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 20:34:27,418 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1720388170] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:34:27,418 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1335771371] [2023-11-23 20:34:27,420 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-23 20:34:27,420 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:34:27,421 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:34:27,421 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:34:27,421 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:34:27,937 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:34:29,043 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1924#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 ~CELLCOUNT~0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-11-23 20:34:29,043 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:34:29,044 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:34:29,044 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 25 [2023-11-23 20:34:29,044 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [248909742] [2023-11-23 20:34:29,044 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:34:29,045 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-23 20:34:29,045 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:29,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-23 20:34:29,047 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=875, Unknown=0, NotChecked=0, Total=1056 [2023-11-23 20:34:29,048 INFO L87 Difference]: Start difference. First operand 32 states and 37 transitions. Second operand has 25 states, 25 states have (on average 2.6) internal successors, (65), 25 states have internal predecessors, (65), 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) [2023-11-23 20:34:29,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:29,538 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2023-11-23 20:34:29,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-23 20:34:29,538 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.6) internal successors, (65), 25 states have internal predecessors, (65), 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 27 [2023-11-23 20:34:29,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:29,539 INFO L225 Difference]: With dead ends: 51 [2023-11-23 20:34:29,540 INFO L226 Difference]: Without dead ends: 33 [2023-11-23 20:34:29,541 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 545 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=339, Invalid=1553, Unknown=0, NotChecked=0, Total=1892 [2023-11-23 20:34:29,542 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 56 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:29,542 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 44 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:34:29,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-11-23 20:34:29,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 29. [2023-11-23 20:34:29,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 28 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) [2023-11-23 20:34:29,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2023-11-23 20:34:29,563 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 27 [2023-11-23 20:34:29,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:29,564 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2023-11-23 20:34:29,564 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.6) internal successors, (65), 25 states have internal predecessors, (65), 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) [2023-11-23 20:34:29,564 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2023-11-23 20:34:29,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-23 20:34:29,565 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:29,565 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:29,589 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-23 20:34:29,772 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:29,772 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:29,773 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:29,773 INFO L85 PathProgramCache]: Analyzing trace with hash 1204859316, now seen corresponding path program 7 times [2023-11-23 20:34:29,773 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:29,773 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1420059428] [2023-11-23 20:34:29,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:29,773 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:29,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:30,847 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 1 proven. 53 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 20:34:30,847 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:30,847 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1420059428] [2023-11-23 20:34:30,847 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1420059428] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:34:30,848 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47174472] [2023-11-23 20:34:30,848 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-23 20:34:30,848 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:30,848 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:34:30,849 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:34:30,850 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-23 20:34:30,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:30,940 INFO L262 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 32 conjunts are in the unsatisfiable core [2023-11-23 20:34:30,943 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:34:31,059 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-23 20:34:31,156 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2023-11-23 20:34:31,238 INFO L349 Elim1Store]: treesize reduction 47, result has 31.9 percent of original size [2023-11-23 20:34:31,239 INFO L378 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 40 treesize of output 42 [2023-11-23 20:34:31,735 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 20:34:31,736 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:34:31,916 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-11-23 20:34:31,989 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2023-11-23 20:34:36,347 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 20:34:36,347 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2023-11-23 20:34:36,359 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 20:34:36,359 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 15 [2023-11-23 20:34:36,422 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2023-11-23 20:34:36,434 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 50 [2023-11-23 20:34:36,442 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 20:34:36,442 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 48 treesize of output 47 [2023-11-23 20:34:36,577 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 20:34:36,577 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [47174472] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:34:36,577 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1752218017] [2023-11-23 20:34:36,579 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-23 20:34:36,579 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:34:36,580 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:34:36,580 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:34:36,580 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:34:37,217 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:34:38,669 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2281#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 ~CELLCOUNT~0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-11-23 20:34:38,669 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:34:38,669 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:34:38,669 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 16] total 42 [2023-11-23 20:34:38,670 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236850852] [2023-11-23 20:34:38,670 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:34:38,671 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2023-11-23 20:34:38,671 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:38,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2023-11-23 20:34:38,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=2222, Unknown=1, NotChecked=0, Total=2450 [2023-11-23 20:34:38,674 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 42 states, 42 states have (on average 1.6904761904761905) internal successors, (71), 42 states have internal predecessors, (71), 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) [2023-11-23 20:34:40,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:40,768 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2023-11-23 20:34:40,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-11-23 20:34:40,769 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.6904761904761905) internal successors, (71), 42 states have internal predecessors, (71), 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 28 [2023-11-23 20:34:40,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:40,770 INFO L225 Difference]: With dead ends: 38 [2023-11-23 20:34:40,770 INFO L226 Difference]: Without dead ends: 36 [2023-11-23 20:34:40,773 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1610 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=526, Invalid=4303, Unknown=1, NotChecked=0, Total=4830 [2023-11-23 20:34:40,774 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 50 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 491 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 540 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 491 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:40,774 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 90 Invalid, 540 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 491 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-23 20:34:40,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-11-23 20:34:40,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 32. [2023-11-23 20:34:40,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 31 states have internal predecessors, (36), 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) [2023-11-23 20:34:40,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2023-11-23 20:34:40,801 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 28 [2023-11-23 20:34:40,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:40,801 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2023-11-23 20:34:40,802 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.6904761904761905) internal successors, (71), 42 states have internal predecessors, (71), 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) [2023-11-23 20:34:40,802 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2023-11-23 20:34:40,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-11-23 20:34:40,803 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:40,803 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:40,835 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-23 20:34:41,017 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b32db8-1e2e-48cc-9c96-a55c1cd9c87d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:41,017 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:41,018 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:41,018 INFO L85 PathProgramCache]: Analyzing trace with hash 927528831, now seen corresponding path program 8 times [2023-11-23 20:34:41,018 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:41,018 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [435857344] [2023-11-23 20:34:41,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:41,018 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:41,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat