./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/up.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version a0165632 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/up.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje --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 ff5c10c83c8d29dcc2c2798035fa2754df224d2313ad9c91b6ee5bb6ca3d9a9f --- Real Ultimate output --- This is Ultimate 0.2.5-dev-a016563 [2024-11-09 07:17:12,200 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-09 07:17:12,307 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/config/svcomp-Reach-32bit-Taipan_Default.epf [2024-11-09 07:17:12,315 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-09 07:17:12,316 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-09 07:17:12,361 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-09 07:17:12,363 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-09 07:17:12,364 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-09 07:17:12,366 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-09 07:17:12,367 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-09 07:17:12,368 INFO L153 SettingsManager]: * User list type=DISABLED [2024-11-09 07:17:12,369 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2024-11-09 07:17:12,370 INFO L153 SettingsManager]: * Explicit value domain=true [2024-11-09 07:17:12,370 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2024-11-09 07:17:12,371 INFO L153 SettingsManager]: * Octagon Domain=false [2024-11-09 07:17:12,371 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2024-11-09 07:17:12,372 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2024-11-09 07:17:12,373 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2024-11-09 07:17:12,373 INFO L153 SettingsManager]: * Interval Domain=false [2024-11-09 07:17:12,374 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2024-11-09 07:17:12,374 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2024-11-09 07:17:12,375 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2024-11-09 07:17:12,376 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-09 07:17:12,377 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-09 07:17:12,377 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-09 07:17:12,378 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-09 07:17:12,378 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-09 07:17:12,379 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-09 07:17:12,379 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-09 07:17:12,380 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-09 07:17:12,380 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-09 07:17:12,381 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-09 07:17:12,381 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-09 07:17:12,405 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-09 07:17:12,406 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-09 07:17:12,407 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-09 07:17:12,407 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-09 07:17:12,408 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-09 07:17:12,408 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-09 07:17:12,408 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-09 07:17:12,409 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-09 07:17:12,411 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-09 07:17:12,411 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2024-11-09 07:17:12,412 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-09 07:17:12,413 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-09 07:17:12,414 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2024-11-09 07:17:12,414 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-09 07:17:12,414 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_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ff5c10c83c8d29dcc2c2798035fa2754df224d2313ad9c91b6ee5bb6ca3d9a9f [2024-11-09 07:17:12,789 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-09 07:17:12,830 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-09 07:17:12,834 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-09 07:17:12,837 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-09 07:17:12,838 INFO L274 PluginConnector]: CDTParser initialized [2024-11-09 07:17:12,840 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/../../sv-benchmarks/c/loop-invgen/up.i Unable to find full path for "g++" [2024-11-09 07:17:15,550 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-09 07:17:15,798 INFO L384 CDTParser]: Found 1 translation units. [2024-11-09 07:17:15,799 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/sv-benchmarks/c/loop-invgen/up.i [2024-11-09 07:17:15,809 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/data/1331d7c47/c695fd5c1cea4a98958bc18e72d8c387/FLAG640d26c00 [2024-11-09 07:17:16,144 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/data/1331d7c47/c695fd5c1cea4a98958bc18e72d8c387 [2024-11-09 07:17:16,147 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-09 07:17:16,150 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-09 07:17:16,152 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-09 07:17:16,152 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-09 07:17:16,161 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-09 07:17:16,162 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 07:17:16" (1/1) ... [2024-11-09 07:17:16,164 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@284450d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:17:16, skipping insertion in model container [2024-11-09 07:17:16,164 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 07:17:16" (1/1) ... [2024-11-09 07:17:16,197 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-09 07:17:16,539 WARN L250 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_88dfb79d-fe81-4b38-9009-83c29f1ef752/sv-benchmarks/c/loop-invgen/up.i[893,906] [2024-11-09 07:17:16,558 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-09 07:17:16,572 INFO L200 MainTranslator]: Completed pre-run [2024-11-09 07:17:16,592 WARN L250 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_88dfb79d-fe81-4b38-9009-83c29f1ef752/sv-benchmarks/c/loop-invgen/up.i[893,906] [2024-11-09 07:17:16,597 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-09 07:17:16,624 INFO L204 MainTranslator]: Completed translation [2024-11-09 07:17:16,625 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:17:16 WrapperNode [2024-11-09 07:17:16,625 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-09 07:17:16,627 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-09 07:17:16,627 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-09 07:17:16,627 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-09 07:17:16,638 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:17:16" (1/1) ... [2024-11-09 07:17:16,645 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:17:16" (1/1) ... [2024-11-09 07:17:16,668 INFO L138 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 41 [2024-11-09 07:17:16,669 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-09 07:17:16,670 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-09 07:17:16,670 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-09 07:17:16,670 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-09 07:17:16,684 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:17:16" (1/1) ... [2024-11-09 07:17:16,684 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:17:16" (1/1) ... [2024-11-09 07:17:16,686 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:17:16" (1/1) ... [2024-11-09 07:17:16,686 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:17:16" (1/1) ... [2024-11-09 07:17:16,690 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:17:16" (1/1) ... [2024-11-09 07:17:16,695 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:17:16" (1/1) ... [2024-11-09 07:17:16,696 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:17:16" (1/1) ... [2024-11-09 07:17:16,697 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:17:16" (1/1) ... [2024-11-09 07:17:16,700 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-09 07:17:16,701 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-09 07:17:16,701 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-09 07:17:16,701 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-09 07:17:16,703 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:17:16" (1/1) ... [2024-11-09 07:17:16,709 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-09 07:17:16,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:17:16,747 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2024-11-09 07:17:16,752 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2024-11-09 07:17:16,795 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-09 07:17:16,795 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-11-09 07:17:16,795 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-09 07:17:16,795 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-09 07:17:16,871 INFO L238 CfgBuilder]: Building ICFG [2024-11-09 07:17:16,874 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-09 07:17:17,069 INFO L? ?]: Removed 11 outVars from TransFormulas that were not future-live. [2024-11-09 07:17:17,070 INFO L287 CfgBuilder]: Performing block encoding [2024-11-09 07:17:17,109 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-09 07:17:17,110 INFO L316 CfgBuilder]: Removed 0 assume(true) statements. [2024-11-09 07:17:17,111 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 07:17:17 BoogieIcfgContainer [2024-11-09 07:17:17,111 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-09 07:17:17,115 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-09 07:17:17,115 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-09 07:17:17,121 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-09 07:17:17,121 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.11 07:17:16" (1/3) ... [2024-11-09 07:17:17,122 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f876e01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 07:17:17, skipping insertion in model container [2024-11-09 07:17:17,123 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:17:16" (2/3) ... [2024-11-09 07:17:17,123 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f876e01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 07:17:17, skipping insertion in model container [2024-11-09 07:17:17,124 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 07:17:17" (3/3) ... [2024-11-09 07:17:17,125 INFO L112 eAbstractionObserver]: Analyzing ICFG up.i [2024-11-09 07:17:17,154 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-09 07:17:17,154 INFO L154 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-11-09 07:17:17,261 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-09 07:17:17,273 INFO L333 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, 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;@5620a4d2, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-09 07:17:17,276 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-11-09 07:17:17,284 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 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) [2024-11-09 07:17:17,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2024-11-09 07:17:17,295 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:17:17,296 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:17:17,297 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:17:17,306 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:17:17,306 INFO L85 PathProgramCache]: Analyzing trace with hash -137622671, now seen corresponding path program 1 times [2024-11-09 07:17:17,323 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:17:17,325 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [925749257] [2024-11-09 07:17:17,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:17:17,328 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:17:17,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:17,825 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:17,826 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:17:17,827 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [925749257] [2024-11-09 07:17:17,828 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [925749257] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-09 07:17:17,828 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-09 07:17:17,829 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2024-11-09 07:17:17,831 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585129068] [2024-11-09 07:17:17,832 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-09 07:17:17,839 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-09 07:17:17,840 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:17:17,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-09 07:17:17,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2024-11-09 07:17:17,877 INFO L87 Difference]: Start difference. First operand has 12 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 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 5 states, 5 states have (on average 1.4) 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) [2024-11-09 07:17:17,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:17:17,968 INFO L93 Difference]: Finished difference Result 24 states and 33 transitions. [2024-11-09 07:17:17,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-09 07:17:17,975 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) 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 [2024-11-09 07:17:17,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:17:17,989 INFO L225 Difference]: With dead ends: 24 [2024-11-09 07:17:17,989 INFO L226 Difference]: Without dead ends: 12 [2024-11-09 07:17:17,993 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2024-11-09 07:17:17,998 INFO L432 NwaCegarLoop]: 8 mSDtfsCounter, 1 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:17:18,000 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 21 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:17:18,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2024-11-09 07:17:18,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2024-11-09 07:17:18,043 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) [2024-11-09 07:17:18,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2024-11-09 07:17:18,046 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 7 [2024-11-09 07:17:18,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:17:18,047 INFO L471 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2024-11-09 07:17:18,048 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) 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) [2024-11-09 07:17:18,048 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2024-11-09 07:17:18,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2024-11-09 07:17:18,049 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:17:18,049 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:17:18,049 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-09 07:17:18,050 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:17:18,051 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:17:18,051 INFO L85 PathProgramCache]: Analyzing trace with hash 2138452598, now seen corresponding path program 1 times [2024-11-09 07:17:18,052 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:17:18,052 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1811140789] [2024-11-09 07:17:18,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:17:18,053 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:17:18,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:18,375 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:18,376 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:17:18,376 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1811140789] [2024-11-09 07:17:18,376 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1811140789] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:17:18,377 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1538419779] [2024-11-09 07:17:18,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:17:18,377 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:18,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:17:18,380 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:17:18,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-11-09 07:17:18,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:18,474 INFO L255 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 5 conjuncts are in the unsatisfiable core [2024-11-09 07:17:18,482 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:17:18,579 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:18,579 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-09 07:17:18,580 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1538419779] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-09 07:17:18,580 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2024-11-09 07:17:18,581 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2024-11-09 07:17:18,582 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [62378815] [2024-11-09 07:17:18,583 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-09 07:17:18,584 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-09 07:17:18,584 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:17:18,585 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-09 07:17:18,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2024-11-09 07:17:18,586 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 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) [2024-11-09 07:17:18,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:17:18,641 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2024-11-09 07:17:18,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-09 07:17:18,642 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 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 [2024-11-09 07:17:18,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:17:18,643 INFO L225 Difference]: With dead ends: 24 [2024-11-09 07:17:18,644 INFO L226 Difference]: Without dead ends: 22 [2024-11-09 07:17:18,645 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2024-11-09 07:17:18,646 INFO L432 NwaCegarLoop]: 8 mSDtfsCounter, 9 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-09 07:17:18,647 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 24 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-09 07:17:18,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2024-11-09 07:17:18,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 15. [2024-11-09 07:17:18,652 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) [2024-11-09 07:17:18,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2024-11-09 07:17:18,653 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2024-11-09 07:17:18,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:17:18,654 INFO L471 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2024-11-09 07:17:18,654 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 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) [2024-11-09 07:17:18,655 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2024-11-09 07:17:18,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2024-11-09 07:17:18,656 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:17:18,656 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:17:18,688 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2024-11-09 07:17:18,860 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:18,862 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:17:18,865 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:17:18,866 INFO L85 PathProgramCache]: Analyzing trace with hash -1536045026, now seen corresponding path program 1 times [2024-11-09 07:17:18,866 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:17:18,867 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [833109920] [2024-11-09 07:17:18,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:17:18,869 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:17:18,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:19,205 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:19,206 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:17:19,206 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [833109920] [2024-11-09 07:17:19,207 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [833109920] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:17:19,207 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1352633039] [2024-11-09 07:17:19,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:17:19,208 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:19,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:17:19,212 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:17:19,216 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-11-09 07:17:19,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:19,301 INFO L255 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjuncts are in the unsatisfiable core [2024-11-09 07:17:19,304 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:17:19,439 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:19,440 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:17:19,574 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:19,575 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1352633039] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:17:19,575 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1891221825] [2024-11-09 07:17:19,615 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:17:19,616 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:17:19,623 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:17:19,633 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:17:19,634 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:17:20,718 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:17:21,439 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '230#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:17:21,441 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:17:21,442 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:17:21,442 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2024-11-09 07:17:21,442 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996273935] [2024-11-09 07:17:21,443 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:17:21,444 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2024-11-09 07:17:21,445 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:17:21,446 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2024-11-09 07:17:21,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2024-11-09 07:17:21,449 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:17:21,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:17:21,570 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2024-11-09 07:17:21,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-11-09 07:17:21,571 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2024-11-09 07:17:21,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:17:21,573 INFO L225 Difference]: With dead ends: 29 [2024-11-09 07:17:21,574 INFO L226 Difference]: Without dead ends: 17 [2024-11-09 07:17:21,575 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 23 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2024-11-09 07:17:21,578 INFO L432 NwaCegarLoop]: 4 mSDtfsCounter, 1 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:17:21,580 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 24 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:17:21,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2024-11-09 07:17:21,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2024-11-09 07:17:21,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:17:21,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2024-11-09 07:17:21,592 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 13 [2024-11-09 07:17:21,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:17:21,592 INFO L471 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2024-11-09 07:17:21,593 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:17:21,593 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2024-11-09 07:17:21,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2024-11-09 07:17:21,593 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:17:21,594 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:17:21,627 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2024-11-09 07:17:21,799 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:21,801 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:17:21,806 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:17:21,806 INFO L85 PathProgramCache]: Analyzing trace with hash 1612832611, now seen corresponding path program 2 times [2024-11-09 07:17:21,806 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:17:21,807 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1240038218] [2024-11-09 07:17:21,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:17:21,807 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:17:21,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:22,075 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:22,076 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:17:22,076 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1240038218] [2024-11-09 07:17:22,079 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1240038218] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:17:22,080 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1804842116] [2024-11-09 07:17:22,080 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:17:22,080 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:22,081 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:17:22,083 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:17:22,087 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-11-09 07:17:22,159 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2024-11-09 07:17:22,159 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:17:22,161 INFO L255 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 10 conjuncts are in the unsatisfiable core [2024-11-09 07:17:22,163 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:17:22,223 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:22,225 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:17:22,289 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:22,290 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1804842116] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:17:22,290 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [577964970] [2024-11-09 07:17:22,295 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:17:22,296 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:17:22,296 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:17:22,297 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:17:22,297 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:17:22,826 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:17:23,436 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '389#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:17:23,436 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:17:23,436 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:17:23,436 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 7 [2024-11-09 07:17:23,437 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1457226842] [2024-11-09 07:17:23,437 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:17:23,438 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2024-11-09 07:17:23,438 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:17:23,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2024-11-09 07:17:23,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2024-11-09 07:17:23,439 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 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) [2024-11-09 07:17:23,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:17:23,545 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2024-11-09 07:17:23,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2024-11-09 07:17:23,546 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 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 15 [2024-11-09 07:17:23,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:17:23,547 INFO L225 Difference]: With dead ends: 30 [2024-11-09 07:17:23,548 INFO L226 Difference]: Without dead ends: 28 [2024-11-09 07:17:23,548 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 31 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2024-11-09 07:17:23,552 INFO L432 NwaCegarLoop]: 9 mSDtfsCounter, 9 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:17:23,554 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 39 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:17:23,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2024-11-09 07:17:23,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 21. [2024-11-09 07:17:23,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 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) [2024-11-09 07:17:23,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2024-11-09 07:17:23,568 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 15 [2024-11-09 07:17:23,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:17:23,569 INFO L471 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2024-11-09 07:17:23,570 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 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) [2024-11-09 07:17:23,570 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2024-11-09 07:17:23,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2024-11-09 07:17:23,572 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:17:23,572 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2024-11-09 07:17:23,606 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2024-11-09 07:17:23,776 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:23,777 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:17:23,778 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:17:23,779 INFO L85 PathProgramCache]: Analyzing trace with hash -1133298037, now seen corresponding path program 3 times [2024-11-09 07:17:23,779 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:17:23,780 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [258084681] [2024-11-09 07:17:23,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:17:23,780 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:17:23,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:23,967 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 5 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:23,968 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:17:23,968 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [258084681] [2024-11-09 07:17:23,968 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [258084681] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:17:23,969 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1744472843] [2024-11-09 07:17:23,969 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:17:23,969 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:23,970 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:17:23,972 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:17:23,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-11-09 07:17:24,042 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:17:24,043 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:17:24,045 INFO L255 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 8 conjuncts are in the unsatisfiable core [2024-11-09 07:17:24,046 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:17:24,189 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:24,190 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:17:24,288 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:24,288 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1744472843] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:17:24,289 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1368265214] [2024-11-09 07:17:24,291 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:17:24,291 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:17:24,292 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:17:24,292 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:17:24,292 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:17:24,675 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:17:25,335 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '587#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:17:25,336 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:17:25,336 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:17:25,336 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2024-11-09 07:17:25,336 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686244218] [2024-11-09 07:17:25,337 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:17:25,337 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2024-11-09 07:17:25,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:17:25,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2024-11-09 07:17:25,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2024-11-09 07:17:25,341 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 13 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) [2024-11-09 07:17:25,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:17:25,462 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2024-11-09 07:17:25,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2024-11-09 07:17:25,464 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 13 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) Word has length 19 [2024-11-09 07:17:25,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:17:25,465 INFO L225 Difference]: With dead ends: 39 [2024-11-09 07:17:25,465 INFO L226 Difference]: Without dead ends: 23 [2024-11-09 07:17:25,466 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 38 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2024-11-09 07:17:25,467 INFO L432 NwaCegarLoop]: 5 mSDtfsCounter, 1 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:17:25,471 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 35 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:17:25,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2024-11-09 07:17:25,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2024-11-09 07:17:25,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 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) [2024-11-09 07:17:25,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2024-11-09 07:17:25,479 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 19 [2024-11-09 07:17:25,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:17:25,479 INFO L471 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2024-11-09 07:17:25,480 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 13 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) [2024-11-09 07:17:25,480 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2024-11-09 07:17:25,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2024-11-09 07:17:25,481 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:17:25,481 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1] [2024-11-09 07:17:25,511 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2024-11-09 07:17:25,685 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:25,686 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:17:25,687 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:17:25,687 INFO L85 PathProgramCache]: Analyzing trace with hash -1280702960, now seen corresponding path program 4 times [2024-11-09 07:17:25,687 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:17:25,687 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [578466646] [2024-11-09 07:17:25,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:17:25,688 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:17:25,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:25,931 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:25,931 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:17:25,931 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [578466646] [2024-11-09 07:17:25,932 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [578466646] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:17:25,932 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [592450930] [2024-11-09 07:17:25,932 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:17:25,932 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:25,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:17:25,935 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:17:25,938 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-11-09 07:17:26,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:26,004 INFO L255 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 9 conjuncts are in the unsatisfiable core [2024-11-09 07:17:26,006 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:17:26,086 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 9 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:26,087 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:17:26,199 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 9 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:26,199 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [592450930] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:17:26,200 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1626549181] [2024-11-09 07:17:26,203 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:17:26,203 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:17:26,204 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:17:26,204 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:17:26,204 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:17:26,520 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:17:27,100 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '804#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:17:27,101 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:17:27,101 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:17:27,101 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 8 [2024-11-09 07:17:27,101 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490596464] [2024-11-09 07:17:27,102 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:17:27,102 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2024-11-09 07:17:27,102 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:17:27,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2024-11-09 07:17:27,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2024-11-09 07:17:27,104 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 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) [2024-11-09 07:17:27,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:17:27,234 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2024-11-09 07:17:27,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2024-11-09 07:17:27,235 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 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) Word has length 21 [2024-11-09 07:17:27,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:17:27,236 INFO L225 Difference]: With dead ends: 36 [2024-11-09 07:17:27,237 INFO L226 Difference]: Without dead ends: 34 [2024-11-09 07:17:27,237 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 47 SyntacticMatches, 7 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2024-11-09 07:17:27,238 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 10 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:17:27,239 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 44 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:17:27,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2024-11-09 07:17:27,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 27. [2024-11-09 07:17:27,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 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) [2024-11-09 07:17:27,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2024-11-09 07:17:27,244 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 21 [2024-11-09 07:17:27,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:17:27,245 INFO L471 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2024-11-09 07:17:27,245 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 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) [2024-11-09 07:17:27,245 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2024-11-09 07:17:27,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2024-11-09 07:17:27,246 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:17:27,246 INFO L215 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2024-11-09 07:17:27,275 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2024-11-09 07:17:27,447 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:27,448 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:17:27,452 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:17:27,452 INFO L85 PathProgramCache]: Analyzing trace with hash 754861752, now seen corresponding path program 5 times [2024-11-09 07:17:27,452 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:17:27,452 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [687938385] [2024-11-09 07:17:27,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:17:27,453 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:17:27,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:27,722 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 12 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:27,722 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:17:27,723 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [687938385] [2024-11-09 07:17:27,723 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [687938385] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:17:27,723 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [146876899] [2024-11-09 07:17:27,723 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:17:27,724 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:27,724 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:17:27,730 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:17:27,737 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2024-11-09 07:17:27,818 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-11-09 07:17:27,818 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:17:27,819 INFO L255 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 10 conjuncts are in the unsatisfiable core [2024-11-09 07:17:27,822 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:17:28,041 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 21 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:28,041 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:17:28,195 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 21 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:28,195 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [146876899] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:17:28,195 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [870326983] [2024-11-09 07:17:28,199 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:17:28,199 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:17:28,202 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:17:28,202 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:17:28,202 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:17:28,534 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:17:29,200 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1059#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:17:29,201 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:17:29,201 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:17:29,201 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2024-11-09 07:17:29,201 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885343352] [2024-11-09 07:17:29,201 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:17:29,202 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2024-11-09 07:17:29,202 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:17:29,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2024-11-09 07:17:29,203 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2024-11-09 07:17:29,204 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand has 17 states, 17 states have (on average 2.764705882352941) internal successors, (47), 16 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) [2024-11-09 07:17:29,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:17:29,346 INFO L93 Difference]: Finished difference Result 49 states and 53 transitions. [2024-11-09 07:17:29,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2024-11-09 07:17:29,347 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.764705882352941) internal successors, (47), 16 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 25 [2024-11-09 07:17:29,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:17:29,348 INFO L225 Difference]: With dead ends: 49 [2024-11-09 07:17:29,348 INFO L226 Difference]: Without dead ends: 29 [2024-11-09 07:17:29,349 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 53 SyntacticMatches, 7 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 248 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2024-11-09 07:17:29,350 INFO L432 NwaCegarLoop]: 6 mSDtfsCounter, 1 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:17:29,350 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 44 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:17:29,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2024-11-09 07:17:29,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2024-11-09 07:17:29,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 28 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:17:29,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2024-11-09 07:17:29,356 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 25 [2024-11-09 07:17:29,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:17:29,356 INFO L471 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2024-11-09 07:17:29,357 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.764705882352941) internal successors, (47), 16 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) [2024-11-09 07:17:29,357 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2024-11-09 07:17:29,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2024-11-09 07:17:29,358 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:17:29,358 INFO L215 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1] [2024-11-09 07:17:29,380 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2024-11-09 07:17:29,562 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:29,563 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:17:29,564 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:17:29,564 INFO L85 PathProgramCache]: Analyzing trace with hash -681535875, now seen corresponding path program 6 times [2024-11-09 07:17:29,564 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:17:29,564 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [528890290] [2024-11-09 07:17:29,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:17:29,565 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:17:29,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:29,776 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 9 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:29,777 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:17:29,777 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [528890290] [2024-11-09 07:17:29,777 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [528890290] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:17:29,778 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1955424605] [2024-11-09 07:17:29,778 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:17:29,778 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:29,779 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:17:29,781 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:17:29,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2024-11-09 07:17:29,872 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:17:29,872 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:17:29,874 INFO L255 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 14 conjuncts are in the unsatisfiable core [2024-11-09 07:17:29,878 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:17:29,991 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 16 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:29,991 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:17:30,119 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 16 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:30,120 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1955424605] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:17:30,121 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1102796329] [2024-11-09 07:17:30,124 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:17:30,125 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:17:30,125 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:17:30,126 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:17:30,126 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:17:30,452 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:17:31,030 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1334#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:17:31,031 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:17:31,031 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:17:31,031 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2024-11-09 07:17:31,032 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993432861] [2024-11-09 07:17:31,032 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:17:31,032 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2024-11-09 07:17:31,033 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:17:31,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2024-11-09 07:17:31,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2024-11-09 07:17:31,035 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 10 states, 10 states have (on average 3.2) internal successors, (32), 9 states have internal predecessors, (32), 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) [2024-11-09 07:17:31,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:17:31,178 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2024-11-09 07:17:31,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2024-11-09 07:17:31,179 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.2) internal successors, (32), 9 states have internal predecessors, (32), 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 [2024-11-09 07:17:31,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:17:31,182 INFO L225 Difference]: With dead ends: 42 [2024-11-09 07:17:31,182 INFO L226 Difference]: Without dead ends: 40 [2024-11-09 07:17:31,183 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 65 SyntacticMatches, 8 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2024-11-09 07:17:31,184 INFO L432 NwaCegarLoop]: 11 mSDtfsCounter, 10 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:17:31,185 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 50 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:17:31,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2024-11-09 07:17:31,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 33. [2024-11-09 07:17:31,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.09375) internal successors, (35), 32 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) [2024-11-09 07:17:31,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2024-11-09 07:17:31,191 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 27 [2024-11-09 07:17:31,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:17:31,192 INFO L471 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2024-11-09 07:17:31,192 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.2) internal successors, (32), 9 states have internal predecessors, (32), 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) [2024-11-09 07:17:31,193 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2024-11-09 07:17:31,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2024-11-09 07:17:31,193 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:17:31,194 INFO L215 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2024-11-09 07:17:31,223 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2024-11-09 07:17:31,398 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:31,399 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:17:31,400 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:17:31,400 INFO L85 PathProgramCache]: Analyzing trace with hash 2028787877, now seen corresponding path program 7 times [2024-11-09 07:17:31,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:17:31,400 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1158474187] [2024-11-09 07:17:31,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:17:31,401 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:17:31,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:31,677 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 23 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:31,678 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:17:31,678 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1158474187] [2024-11-09 07:17:31,678 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1158474187] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:17:31,678 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1616790340] [2024-11-09 07:17:31,678 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:17:31,679 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:31,679 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:17:31,681 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:17:31,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2024-11-09 07:17:31,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:31,765 INFO L255 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 12 conjuncts are in the unsatisfiable core [2024-11-09 07:17:31,767 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:17:32,016 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 36 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:32,016 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:17:32,156 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 36 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:32,157 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1616790340] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:17:32,157 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1623489888] [2024-11-09 07:17:32,159 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:17:32,159 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:17:32,159 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:17:32,159 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:17:32,160 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:17:32,438 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:17:32,985 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1646#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:17:32,986 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:17:32,986 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:17:32,986 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2024-11-09 07:17:32,986 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1551544581] [2024-11-09 07:17:32,986 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:17:32,987 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-09 07:17:32,987 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:17:32,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-09 07:17:32,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=632, Unknown=0, NotChecked=0, Total=756 [2024-11-09 07:17:32,988 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand has 20 states, 20 states have (on average 2.85) internal successors, (57), 19 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) [2024-11-09 07:17:33,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:17:33,107 INFO L93 Difference]: Finished difference Result 59 states and 63 transitions. [2024-11-09 07:17:33,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2024-11-09 07:17:33,108 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.85) internal successors, (57), 19 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 31 [2024-11-09 07:17:33,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:17:33,109 INFO L225 Difference]: With dead ends: 59 [2024-11-09 07:17:33,109 INFO L226 Difference]: Without dead ends: 35 [2024-11-09 07:17:33,110 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 68 SyntacticMatches, 9 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 340 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=124, Invalid=632, Unknown=0, NotChecked=0, Total=756 [2024-11-09 07:17:33,111 INFO L432 NwaCegarLoop]: 7 mSDtfsCounter, 1 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:17:33,111 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 35 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:17:33,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2024-11-09 07:17:33,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2024-11-09 07:17:33,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 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) [2024-11-09 07:17:33,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2024-11-09 07:17:33,117 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 31 [2024-11-09 07:17:33,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:17:33,117 INFO L471 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2024-11-09 07:17:33,117 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.85) internal successors, (57), 19 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) [2024-11-09 07:17:33,117 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2024-11-09 07:17:33,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2024-11-09 07:17:33,118 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:17:33,119 INFO L215 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1] [2024-11-09 07:17:33,140 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2024-11-09 07:17:33,322 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:33,323 INFO L396 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:17:33,323 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:17:33,323 INFO L85 PathProgramCache]: Analyzing trace with hash 323190954, now seen corresponding path program 8 times [2024-11-09 07:17:33,324 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:17:33,324 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1246067665] [2024-11-09 07:17:33,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:17:33,324 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:17:33,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:33,550 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 16 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:33,551 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:17:33,551 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1246067665] [2024-11-09 07:17:33,551 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1246067665] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:17:33,551 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [111883141] [2024-11-09 07:17:33,551 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:17:33,552 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:33,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:17:33,554 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:17:33,558 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2024-11-09 07:17:33,645 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2024-11-09 07:17:33,645 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:17:33,646 INFO L255 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 16 conjuncts are in the unsatisfiable core [2024-11-09 07:17:33,649 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:17:33,737 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 25 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:33,738 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:17:33,875 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 25 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:33,875 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [111883141] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:17:33,876 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1205247728] [2024-11-09 07:17:33,878 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:17:33,878 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:17:33,879 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:17:33,879 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:17:33,879 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:17:34,173 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:17:34,653 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1979#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:17:34,653 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:17:34,653 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:17:34,653 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 10 [2024-11-09 07:17:34,654 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182476954] [2024-11-09 07:17:34,654 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:17:34,655 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2024-11-09 07:17:34,655 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:17:34,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2024-11-09 07:17:34,656 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=278, Unknown=0, NotChecked=0, Total=342 [2024-11-09 07:17:34,656 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 11 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 10 states have internal predecessors, (38), 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) [2024-11-09 07:17:34,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:17:34,828 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2024-11-09 07:17:34,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2024-11-09 07:17:34,828 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 10 states have internal predecessors, (38), 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 33 [2024-11-09 07:17:34,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:17:34,829 INFO L225 Difference]: With dead ends: 48 [2024-11-09 07:17:34,829 INFO L226 Difference]: Without dead ends: 46 [2024-11-09 07:17:34,830 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 82 SyntacticMatches, 10 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 156 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=114, Invalid=438, Unknown=0, NotChecked=0, Total=552 [2024-11-09 07:17:34,831 INFO L432 NwaCegarLoop]: 12 mSDtfsCounter, 9 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:17:34,831 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 62 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:17:34,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2024-11-09 07:17:34,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 39. [2024-11-09 07:17:34,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 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) [2024-11-09 07:17:34,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2024-11-09 07:17:34,838 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 33 [2024-11-09 07:17:34,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:17:34,839 INFO L471 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2024-11-09 07:17:34,839 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 10 states have internal predecessors, (38), 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) [2024-11-09 07:17:34,839 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2024-11-09 07:17:34,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2024-11-09 07:17:34,840 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:17:34,840 INFO L215 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1] [2024-11-09 07:17:34,863 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2024-11-09 07:17:35,041 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:35,041 INFO L396 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:17:35,042 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:17:35,042 INFO L85 PathProgramCache]: Analyzing trace with hash -674962350, now seen corresponding path program 9 times [2024-11-09 07:17:35,042 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:17:35,043 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1310927479] [2024-11-09 07:17:35,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:17:35,043 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:17:35,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:35,370 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 38 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:35,370 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:17:35,370 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1310927479] [2024-11-09 07:17:35,371 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1310927479] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:17:35,371 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1733979189] [2024-11-09 07:17:35,371 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:17:35,372 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:35,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:17:35,374 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:17:35,377 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2024-11-09 07:17:35,467 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:17:35,467 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:17:35,469 INFO L255 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 14 conjuncts are in the unsatisfiable core [2024-11-09 07:17:35,471 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:17:35,786 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 55 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:35,787 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:17:36,003 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 55 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:36,003 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1733979189] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:17:36,003 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [970665193] [2024-11-09 07:17:36,006 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:17:36,006 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:17:36,007 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:17:36,007 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:17:36,007 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:17:36,297 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:17:36,854 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2348#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:17:36,854 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:17:36,854 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:17:36,855 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 22 [2024-11-09 07:17:36,855 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528305427] [2024-11-09 07:17:36,855 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:17:36,856 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2024-11-09 07:17:36,856 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:17:36,857 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2024-11-09 07:17:36,858 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=776, Unknown=0, NotChecked=0, Total=930 [2024-11-09 07:17:36,858 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand has 23 states, 23 states have (on average 2.9130434782608696) internal successors, (67), 22 states have internal predecessors, (67), 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) [2024-11-09 07:17:37,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:17:37,016 INFO L93 Difference]: Finished difference Result 69 states and 73 transitions. [2024-11-09 07:17:37,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2024-11-09 07:17:37,018 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.9130434782608696) internal successors, (67), 22 states have internal predecessors, (67), 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 37 [2024-11-09 07:17:37,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:17:37,019 INFO L225 Difference]: With dead ends: 69 [2024-11-09 07:17:37,019 INFO L226 Difference]: Without dead ends: 41 [2024-11-09 07:17:37,020 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 83 SyntacticMatches, 11 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 444 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=154, Invalid=776, Unknown=0, NotChecked=0, Total=930 [2024-11-09 07:17:37,021 INFO L432 NwaCegarLoop]: 8 mSDtfsCounter, 1 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:17:37,021 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 63 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 169 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:17:37,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2024-11-09 07:17:37,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2024-11-09 07:17:37,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.075) internal successors, (43), 40 states have internal predecessors, (43), 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) [2024-11-09 07:17:37,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2024-11-09 07:17:37,028 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 37 [2024-11-09 07:17:37,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:17:37,028 INFO L471 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2024-11-09 07:17:37,028 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.9130434782608696) internal successors, (67), 22 states have internal predecessors, (67), 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) [2024-11-09 07:17:37,029 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2024-11-09 07:17:37,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2024-11-09 07:17:37,030 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:17:37,030 INFO L215 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1] [2024-11-09 07:17:37,053 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2024-11-09 07:17:37,231 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:37,231 INFO L396 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:17:37,231 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:17:37,231 INFO L85 PathProgramCache]: Analyzing trace with hash -117656425, now seen corresponding path program 10 times [2024-11-09 07:17:37,232 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:17:37,232 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [247816834] [2024-11-09 07:17:37,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:17:37,232 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:17:37,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:37,475 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 25 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:37,476 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:17:37,476 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [247816834] [2024-11-09 07:17:37,476 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [247816834] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:17:37,477 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1270488133] [2024-11-09 07:17:37,477 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:17:37,477 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:37,477 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:17:37,479 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:17:37,481 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2024-11-09 07:17:37,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:37,563 INFO L255 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 15 conjuncts are in the unsatisfiable core [2024-11-09 07:17:37,565 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:17:37,661 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 36 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:37,662 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:17:37,845 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 36 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:37,846 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1270488133] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:17:37,846 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1059620124] [2024-11-09 07:17:37,848 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:17:37,848 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:17:37,849 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:17:37,849 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:17:37,849 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:17:38,114 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:17:38,611 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2739#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:17:38,611 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:17:38,612 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:17:38,612 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 11 [2024-11-09 07:17:38,612 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152999374] [2024-11-09 07:17:38,612 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:17:38,613 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2024-11-09 07:17:38,613 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:17:38,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2024-11-09 07:17:38,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2024-11-09 07:17:38,614 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 12 states, 12 states have (on average 3.6666666666666665) internal successors, (44), 11 states have internal predecessors, (44), 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) [2024-11-09 07:17:38,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:17:38,805 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2024-11-09 07:17:38,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2024-11-09 07:17:38,807 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.6666666666666665) internal successors, (44), 11 states have internal predecessors, (44), 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 39 [2024-11-09 07:17:38,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:17:38,808 INFO L225 Difference]: With dead ends: 54 [2024-11-09 07:17:38,809 INFO L226 Difference]: Without dead ends: 52 [2024-11-09 07:17:38,809 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 98 SyntacticMatches, 13 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2024-11-09 07:17:38,813 INFO L432 NwaCegarLoop]: 13 mSDtfsCounter, 14 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:17:38,814 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 75 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:17:38,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2024-11-09 07:17:38,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 45. [2024-11-09 07:17:38,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 44 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) [2024-11-09 07:17:38,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2024-11-09 07:17:38,828 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 39 [2024-11-09 07:17:38,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:17:38,829 INFO L471 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2024-11-09 07:17:38,829 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.6666666666666665) internal successors, (44), 11 states have internal predecessors, (44), 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) [2024-11-09 07:17:38,829 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2024-11-09 07:17:38,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2024-11-09 07:17:38,830 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:17:38,830 INFO L215 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1] [2024-11-09 07:17:38,864 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2024-11-09 07:17:39,035 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2024-11-09 07:17:39,036 INFO L396 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:17:39,037 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:17:39,040 INFO L85 PathProgramCache]: Analyzing trace with hash 347625919, now seen corresponding path program 11 times [2024-11-09 07:17:39,040 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:17:39,041 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404670539] [2024-11-09 07:17:39,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:17:39,041 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:17:39,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:39,479 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 57 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:39,479 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:17:39,480 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404670539] [2024-11-09 07:17:39,480 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [404670539] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:17:39,480 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1105109510] [2024-11-09 07:17:39,480 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:17:39,480 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:39,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:17:39,482 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:17:39,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2024-11-09 07:17:39,583 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2024-11-09 07:17:39,583 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:17:39,585 INFO L255 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 16 conjuncts are in the unsatisfiable core [2024-11-09 07:17:39,587 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:17:39,893 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 78 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:39,893 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:17:40,175 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 78 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:40,175 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1105109510] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:17:40,175 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2118834042] [2024-11-09 07:17:40,177 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:17:40,178 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:17:40,178 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:17:40,179 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:17:40,179 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:17:40,431 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:17:41,031 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3165#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:17:41,031 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:17:41,031 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:17:41,032 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2024-11-09 07:17:41,032 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619456632] [2024-11-09 07:17:41,032 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:17:41,033 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2024-11-09 07:17:41,033 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:17:41,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2024-11-09 07:17:41,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=934, Unknown=0, NotChecked=0, Total=1122 [2024-11-09 07:17:41,036 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 26 states, 26 states have (on average 2.9615384615384617) internal successors, (77), 25 states have internal predecessors, (77), 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) [2024-11-09 07:17:41,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:17:41,257 INFO L93 Difference]: Finished difference Result 79 states and 83 transitions. [2024-11-09 07:17:41,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2024-11-09 07:17:41,258 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.9615384615384617) internal successors, (77), 25 states have internal predecessors, (77), 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 43 [2024-11-09 07:17:41,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:17:41,259 INFO L225 Difference]: With dead ends: 79 [2024-11-09 07:17:41,259 INFO L226 Difference]: Without dead ends: 47 [2024-11-09 07:17:41,260 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 98 SyntacticMatches, 13 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 560 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=188, Invalid=934, Unknown=0, NotChecked=0, Total=1122 [2024-11-09 07:17:41,261 INFO L432 NwaCegarLoop]: 9 mSDtfsCounter, 1 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 07:17:41,262 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 79 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 215 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 07:17:41,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2024-11-09 07:17:41,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2024-11-09 07:17:41,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.065217391304348) internal successors, (49), 46 states have internal predecessors, (49), 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) [2024-11-09 07:17:41,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2024-11-09 07:17:41,269 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 43 [2024-11-09 07:17:41,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:17:41,270 INFO L471 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2024-11-09 07:17:41,270 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.9615384615384617) internal successors, (77), 25 states have internal predecessors, (77), 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) [2024-11-09 07:17:41,270 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2024-11-09 07:17:41,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2024-11-09 07:17:41,272 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:17:41,272 INFO L215 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 1, 1, 1, 1, 1] [2024-11-09 07:17:41,297 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2024-11-09 07:17:41,476 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2024-11-09 07:17:41,477 INFO L396 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:17:41,477 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:17:41,477 INFO L85 PathProgramCache]: Analyzing trace with hash -2099109308, now seen corresponding path program 12 times [2024-11-09 07:17:41,477 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:17:41,478 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1891690322] [2024-11-09 07:17:41,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:17:41,478 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:17:41,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:41,823 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 36 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:41,824 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:17:41,824 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1891690322] [2024-11-09 07:17:41,824 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1891690322] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:17:41,824 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [860949506] [2024-11-09 07:17:41,824 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:17:41,824 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:41,825 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:17:41,829 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:17:41,831 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2024-11-09 07:17:41,933 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:17:41,933 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:17:41,935 INFO L255 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 20 conjuncts are in the unsatisfiable core [2024-11-09 07:17:41,938 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:17:42,084 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 49 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:42,084 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:17:42,237 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 49 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:42,237 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [860949506] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:17:42,237 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2092659278] [2024-11-09 07:17:42,239 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:17:42,239 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:17:42,240 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:17:42,240 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:17:42,240 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:17:42,445 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:17:42,962 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3614#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:17:42,963 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:17:42,963 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:17:42,963 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 12 [2024-11-09 07:17:42,963 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2095236796] [2024-11-09 07:17:42,964 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:17:42,964 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2024-11-09 07:17:42,964 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:17:42,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2024-11-09 07:17:42,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=339, Unknown=0, NotChecked=0, Total=420 [2024-11-09 07:17:42,967 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand has 13 states, 13 states have (on average 3.8461538461538463) internal successors, (50), 12 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) [2024-11-09 07:17:43,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:17:43,184 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2024-11-09 07:17:43,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2024-11-09 07:17:43,185 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.8461538461538463) internal successors, (50), 12 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 45 [2024-11-09 07:17:43,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:17:43,186 INFO L225 Difference]: With dead ends: 60 [2024-11-09 07:17:43,187 INFO L226 Difference]: Without dead ends: 58 [2024-11-09 07:17:43,187 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 116 SyntacticMatches, 14 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=165, Invalid=591, Unknown=0, NotChecked=0, Total=756 [2024-11-09 07:17:43,188 INFO L432 NwaCegarLoop]: 14 mSDtfsCounter, 11 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:17:43,188 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 75 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:17:43,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2024-11-09 07:17:43,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 51. [2024-11-09 07:17:43,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.06) internal successors, (53), 50 states have internal predecessors, (53), 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) [2024-11-09 07:17:43,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2024-11-09 07:17:43,196 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 45 [2024-11-09 07:17:43,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:17:43,197 INFO L471 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2024-11-09 07:17:43,197 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 3.8461538461538463) internal successors, (50), 12 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) [2024-11-09 07:17:43,197 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2024-11-09 07:17:43,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2024-11-09 07:17:43,198 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:17:43,199 INFO L215 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1] [2024-11-09 07:17:43,228 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2024-11-09 07:17:43,399 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2024-11-09 07:17:43,400 INFO L396 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:17:43,400 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:17:43,400 INFO L85 PathProgramCache]: Analyzing trace with hash 765798636, now seen corresponding path program 13 times [2024-11-09 07:17:43,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:17:43,401 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2136917917] [2024-11-09 07:17:43,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:17:43,401 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:17:43,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:43,892 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 80 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:43,893 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:17:43,893 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2136917917] [2024-11-09 07:17:43,893 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2136917917] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:17:43,893 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [287159841] [2024-11-09 07:17:43,894 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:17:43,895 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:43,896 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:17:43,900 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:17:43,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2024-11-09 07:17:43,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:43,993 INFO L255 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 18 conjuncts are in the unsatisfiable core [2024-11-09 07:17:43,996 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:17:44,388 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 105 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:44,388 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:17:44,680 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 105 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:44,681 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [287159841] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:17:44,681 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [643683996] [2024-11-09 07:17:44,683 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:17:44,683 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:17:44,683 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:17:44,684 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:17:44,684 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:17:44,954 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:17:45,561 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4097#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:17:45,561 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:17:45,562 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:17:45,562 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 28 [2024-11-09 07:17:45,562 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053396226] [2024-11-09 07:17:45,562 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:17:45,563 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2024-11-09 07:17:45,563 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:17:45,564 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2024-11-09 07:17:45,564 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=1106, Unknown=0, NotChecked=0, Total=1332 [2024-11-09 07:17:45,565 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand has 29 states, 29 states have (on average 3.0) internal successors, (87), 28 states have internal predecessors, (87), 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) [2024-11-09 07:17:45,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:17:45,775 INFO L93 Difference]: Finished difference Result 89 states and 93 transitions. [2024-11-09 07:17:45,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2024-11-09 07:17:45,776 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 3.0) internal successors, (87), 28 states have internal predecessors, (87), 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 49 [2024-11-09 07:17:45,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:17:45,777 INFO L225 Difference]: With dead ends: 89 [2024-11-09 07:17:45,777 INFO L226 Difference]: Without dead ends: 53 [2024-11-09 07:17:45,778 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 113 SyntacticMatches, 15 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 688 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=226, Invalid=1106, Unknown=0, NotChecked=0, Total=1332 [2024-11-09 07:17:45,779 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 1 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 213 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 213 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 07:17:45,779 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 79 Invalid, 214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 213 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 07:17:45,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2024-11-09 07:17:45,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2024-11-09 07:17:45,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.0576923076923077) internal successors, (55), 52 states have internal predecessors, (55), 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) [2024-11-09 07:17:45,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2024-11-09 07:17:45,795 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 49 [2024-11-09 07:17:45,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:17:45,796 INFO L471 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2024-11-09 07:17:45,796 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 3.0) internal successors, (87), 28 states have internal predecessors, (87), 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) [2024-11-09 07:17:45,797 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2024-11-09 07:17:45,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2024-11-09 07:17:45,800 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:17:45,800 INFO L215 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 1, 1, 1, 1, 1] [2024-11-09 07:17:45,825 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2024-11-09 07:17:46,001 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2024-11-09 07:17:46,002 INFO L396 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:17:46,002 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:17:46,002 INFO L85 PathProgramCache]: Analyzing trace with hash -218777167, now seen corresponding path program 14 times [2024-11-09 07:17:46,003 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:17:46,003 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [564452676] [2024-11-09 07:17:46,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:17:46,003 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:17:46,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:46,376 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 49 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:46,376 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:17:46,377 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [564452676] [2024-11-09 07:17:46,377 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [564452676] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:17:46,377 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1063271220] [2024-11-09 07:17:46,377 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:17:46,377 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:46,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:17:46,380 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:17:46,399 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2024-11-09 07:17:46,504 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2024-11-09 07:17:46,505 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:17:46,508 INFO L255 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 22 conjuncts are in the unsatisfiable core [2024-11-09 07:17:46,510 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:17:46,631 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 64 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:46,631 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:17:46,881 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 64 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:46,881 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1063271220] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:17:46,882 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [738389321] [2024-11-09 07:17:46,884 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:17:46,884 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:17:46,885 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:17:46,885 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:17:46,885 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:17:47,189 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:17:47,696 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4604#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:17:47,696 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:17:47,696 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:17:47,696 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 13 [2024-11-09 07:17:47,696 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642779458] [2024-11-09 07:17:47,697 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:17:47,697 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2024-11-09 07:17:47,697 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:17:47,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2024-11-09 07:17:47,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2024-11-09 07:17:47,698 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand has 14 states, 14 states have (on average 4.0) internal successors, (56), 13 states have internal predecessors, (56), 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) [2024-11-09 07:17:47,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:17:47,913 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2024-11-09 07:17:47,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2024-11-09 07:17:47,914 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.0) internal successors, (56), 13 states have internal predecessors, (56), 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 51 [2024-11-09 07:17:47,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:17:47,914 INFO L225 Difference]: With dead ends: 66 [2024-11-09 07:17:47,915 INFO L226 Difference]: Without dead ends: 64 [2024-11-09 07:17:47,915 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 133 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 288 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=195, Invalid=675, Unknown=0, NotChecked=0, Total=870 [2024-11-09 07:17:47,916 INFO L432 NwaCegarLoop]: 15 mSDtfsCounter, 11 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:17:47,917 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 91 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:17:47,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2024-11-09 07:17:47,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 57. [2024-11-09 07:17:47,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 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) [2024-11-09 07:17:47,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2024-11-09 07:17:47,930 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 51 [2024-11-09 07:17:47,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:17:47,930 INFO L471 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2024-11-09 07:17:47,931 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.0) internal successors, (56), 13 states have internal predecessors, (56), 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) [2024-11-09 07:17:47,931 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2024-11-09 07:17:47,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2024-11-09 07:17:47,932 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:17:47,932 INFO L215 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1] [2024-11-09 07:17:47,955 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2024-11-09 07:17:48,136 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2024-11-09 07:17:48,137 INFO L396 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:17:48,137 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:17:48,137 INFO L85 PathProgramCache]: Analyzing trace with hash -1307229735, now seen corresponding path program 15 times [2024-11-09 07:17:48,138 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:17:48,138 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1142569885] [2024-11-09 07:17:48,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:17:48,138 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:17:48,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:48,721 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 107 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:48,721 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:17:48,721 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1142569885] [2024-11-09 07:17:48,721 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1142569885] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:17:48,721 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [393044495] [2024-11-09 07:17:48,721 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:17:48,722 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:48,722 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:17:48,723 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:17:48,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2024-11-09 07:17:48,833 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:17:48,833 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:17:48,835 INFO L255 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 20 conjuncts are in the unsatisfiable core [2024-11-09 07:17:48,837 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:17:49,381 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 136 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:49,382 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:17:49,769 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 136 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:49,770 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [393044495] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:17:49,770 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [789862575] [2024-11-09 07:17:49,771 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:17:49,771 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:17:49,772 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:17:49,772 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:17:49,772 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:17:50,023 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:17:50,621 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5144#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:17:50,621 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:17:50,621 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:17:50,622 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 31 [2024-11-09 07:17:50,622 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [110737592] [2024-11-09 07:17:50,622 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:17:50,622 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2024-11-09 07:17:50,623 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:17:50,623 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2024-11-09 07:17:50,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=268, Invalid=1292, Unknown=0, NotChecked=0, Total=1560 [2024-11-09 07:17:50,624 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand has 32 states, 32 states have (on average 3.03125) internal successors, (97), 31 states have internal predecessors, (97), 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) [2024-11-09 07:17:50,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:17:50,860 INFO L93 Difference]: Finished difference Result 99 states and 103 transitions. [2024-11-09 07:17:50,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2024-11-09 07:17:50,861 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.03125) internal successors, (97), 31 states have internal predecessors, (97), 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 55 [2024-11-09 07:17:50,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:17:50,862 INFO L225 Difference]: With dead ends: 99 [2024-11-09 07:17:50,862 INFO L226 Difference]: Without dead ends: 59 [2024-11-09 07:17:50,863 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 128 SyntacticMatches, 17 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 828 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=268, Invalid=1292, Unknown=0, NotChecked=0, Total=1560 [2024-11-09 07:17:50,864 INFO L432 NwaCegarLoop]: 11 mSDtfsCounter, 1 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 309 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 310 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 309 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 07:17:50,864 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 112 Invalid, 310 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 309 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 07:17:50,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2024-11-09 07:17:50,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2024-11-09 07:17:50,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 58 states have internal predecessors, (61), 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) [2024-11-09 07:17:50,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2024-11-09 07:17:50,871 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 55 [2024-11-09 07:17:50,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:17:50,871 INFO L471 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2024-11-09 07:17:50,872 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 3.03125) internal successors, (97), 31 states have internal predecessors, (97), 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) [2024-11-09 07:17:50,872 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2024-11-09 07:17:50,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2024-11-09 07:17:50,873 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:17:50,873 INFO L215 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 1, 1, 1, 1, 1] [2024-11-09 07:17:50,902 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2024-11-09 07:17:51,074 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2024-11-09 07:17:51,074 INFO L396 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:17:51,075 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:17:51,075 INFO L85 PathProgramCache]: Analyzing trace with hash 1910860510, now seen corresponding path program 16 times [2024-11-09 07:17:51,075 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:17:51,075 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1377547424] [2024-11-09 07:17:51,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:17:51,075 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:17:51,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:51,479 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 64 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:51,479 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:17:51,479 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1377547424] [2024-11-09 07:17:51,480 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1377547424] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:17:51,480 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [206629010] [2024-11-09 07:17:51,480 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:17:51,480 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:51,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:17:51,483 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:17:51,485 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2024-11-09 07:17:51,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:51,587 INFO L255 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 21 conjuncts are in the unsatisfiable core [2024-11-09 07:17:51,589 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:17:51,750 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 81 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:51,750 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:17:52,092 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 81 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:52,092 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [206629010] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:17:52,092 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1743834491] [2024-11-09 07:17:52,094 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:17:52,094 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:17:52,095 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:17:52,095 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:17:52,095 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:17:52,365 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:17:52,999 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5709#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:17:53,000 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:17:53,000 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:17:53,000 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 14 [2024-11-09 07:17:53,000 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006925544] [2024-11-09 07:17:53,000 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:17:53,001 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2024-11-09 07:17:53,005 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:17:53,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2024-11-09 07:17:53,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=404, Unknown=0, NotChecked=0, Total=506 [2024-11-09 07:17:53,007 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand has 15 states, 15 states have (on average 4.133333333333334) internal successors, (62), 14 states have internal predecessors, (62), 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) [2024-11-09 07:17:53,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:17:53,254 INFO L93 Difference]: Finished difference Result 72 states and 74 transitions. [2024-11-09 07:17:53,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2024-11-09 07:17:53,255 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 4.133333333333334) internal successors, (62), 14 states have internal predecessors, (62), 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 57 [2024-11-09 07:17:53,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:17:53,255 INFO L225 Difference]: With dead ends: 72 [2024-11-09 07:17:53,256 INFO L226 Difference]: Without dead ends: 70 [2024-11-09 07:17:53,256 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 149 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 349 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=228, Invalid=764, Unknown=0, NotChecked=0, Total=992 [2024-11-09 07:17:53,257 INFO L432 NwaCegarLoop]: 16 mSDtfsCounter, 12 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:17:53,257 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 91 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:17:53,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2024-11-09 07:17:53,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 63. [2024-11-09 07:17:53,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.0483870967741935) internal successors, (65), 62 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) [2024-11-09 07:17:53,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2024-11-09 07:17:53,264 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 57 [2024-11-09 07:17:53,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:17:53,265 INFO L471 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2024-11-09 07:17:53,265 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 4.133333333333334) internal successors, (62), 14 states have internal predecessors, (62), 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) [2024-11-09 07:17:53,265 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2024-11-09 07:17:53,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2024-11-09 07:17:53,266 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:17:53,267 INFO L215 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1] [2024-11-09 07:17:53,293 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2024-11-09 07:17:53,468 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2024-11-09 07:17:53,469 INFO L396 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:17:53,469 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:17:53,469 INFO L85 PathProgramCache]: Analyzing trace with hash -499215226, now seen corresponding path program 17 times [2024-11-09 07:17:53,469 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:17:53,470 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [401600541] [2024-11-09 07:17:53,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:17:53,470 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:17:53,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:54,017 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 138 proven. 114 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:54,018 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:17:54,018 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [401600541] [2024-11-09 07:17:54,018 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [401600541] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:17:54,018 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1240101919] [2024-11-09 07:17:54,018 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:17:54,018 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:54,018 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:17:54,020 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:17:54,029 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2024-11-09 07:17:54,127 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2024-11-09 07:17:54,127 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:17:54,128 INFO L255 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 22 conjuncts are in the unsatisfiable core [2024-11-09 07:17:54,130 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:17:54,621 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 171 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:54,621 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:17:55,053 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 171 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:55,054 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1240101919] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:17:55,054 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1872498524] [2024-11-09 07:17:55,056 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:17:55,056 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:17:55,056 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:17:55,057 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:17:55,057 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:17:55,265 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:17:56,013 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6306#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:17:56,014 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:17:56,014 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:17:56,014 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 34 [2024-11-09 07:17:56,015 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [427019881] [2024-11-09 07:17:56,015 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:17:56,015 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2024-11-09 07:17:56,016 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:17:56,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2024-11-09 07:17:56,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=1492, Unknown=0, NotChecked=0, Total=1806 [2024-11-09 07:17:56,018 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand has 35 states, 35 states have (on average 3.057142857142857) internal successors, (107), 34 states have internal predecessors, (107), 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) [2024-11-09 07:17:56,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:17:56,356 INFO L93 Difference]: Finished difference Result 109 states and 113 transitions. [2024-11-09 07:17:56,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2024-11-09 07:17:56,357 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.057142857142857) internal successors, (107), 34 states have internal predecessors, (107), 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 61 [2024-11-09 07:17:56,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:17:56,357 INFO L225 Difference]: With dead ends: 109 [2024-11-09 07:17:56,358 INFO L226 Difference]: Without dead ends: 65 [2024-11-09 07:17:56,359 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 143 SyntacticMatches, 19 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 980 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=314, Invalid=1492, Unknown=0, NotChecked=0, Total=1806 [2024-11-09 07:17:56,360 INFO L432 NwaCegarLoop]: 12 mSDtfsCounter, 1 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 380 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 381 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 380 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:17:56,360 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 136 Invalid, 381 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 380 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:17:56,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2024-11-09 07:17:56,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2024-11-09 07:17:56,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.046875) internal successors, (67), 64 states have internal predecessors, (67), 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) [2024-11-09 07:17:56,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2024-11-09 07:17:56,367 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 61 [2024-11-09 07:17:56,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:17:56,368 INFO L471 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2024-11-09 07:17:56,368 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.057142857142857) internal successors, (107), 34 states have internal predecessors, (107), 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) [2024-11-09 07:17:56,369 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2024-11-09 07:17:56,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2024-11-09 07:17:56,370 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:17:56,370 INFO L215 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 1, 1, 1, 1, 1] [2024-11-09 07:17:56,396 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2024-11-09 07:17:56,571 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:56,571 INFO L396 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:17:56,571 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:17:56,572 INFO L85 PathProgramCache]: Analyzing trace with hash 1846224331, now seen corresponding path program 18 times [2024-11-09 07:17:56,572 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:17:56,572 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [642589160] [2024-11-09 07:17:56,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:17:56,572 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:17:56,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:57,055 INFO L134 CoverageAnalysis]: Checked inductivity of 271 backedges. 81 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:57,055 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:17:57,055 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [642589160] [2024-11-09 07:17:57,056 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [642589160] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:17:57,056 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1271085098] [2024-11-09 07:17:57,056 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:17:57,056 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:57,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:17:57,059 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:17:57,062 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2024-11-09 07:17:57,182 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:17:57,182 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:17:57,184 INFO L255 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 26 conjuncts are in the unsatisfiable core [2024-11-09 07:17:57,187 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:17:57,301 INFO L134 CoverageAnalysis]: Checked inductivity of 271 backedges. 100 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:57,301 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:17:57,542 INFO L134 CoverageAnalysis]: Checked inductivity of 271 backedges. 100 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:57,543 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1271085098] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:17:57,543 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [519857312] [2024-11-09 07:17:57,544 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:17:57,545 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:17:57,545 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:17:57,545 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:17:57,545 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:17:57,749 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:17:58,191 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6929#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:17:58,191 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:17:58,191 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:17:58,191 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 15 [2024-11-09 07:17:58,192 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713696142] [2024-11-09 07:17:58,192 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:17:58,192 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2024-11-09 07:17:58,192 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:17:58,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2024-11-09 07:17:58,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=438, Unknown=0, NotChecked=0, Total=552 [2024-11-09 07:17:58,193 INFO L87 Difference]: Start difference. First operand 65 states and 67 transitions. Second operand has 16 states, 16 states have (on average 4.25) internal successors, (68), 15 states have internal predecessors, (68), 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) [2024-11-09 07:17:58,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:17:58,436 INFO L93 Difference]: Finished difference Result 78 states and 80 transitions. [2024-11-09 07:17:58,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2024-11-09 07:17:58,437 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 4.25) internal successors, (68), 15 states have internal predecessors, (68), 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 63 [2024-11-09 07:17:58,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:17:58,438 INFO L225 Difference]: With dead ends: 78 [2024-11-09 07:17:58,438 INFO L226 Difference]: Without dead ends: 76 [2024-11-09 07:17:58,438 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 167 SyntacticMatches, 20 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 396 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=264, Invalid=858, Unknown=0, NotChecked=0, Total=1122 [2024-11-09 07:17:58,439 INFO L432 NwaCegarLoop]: 17 mSDtfsCounter, 13 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:17:58,440 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 95 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:17:58,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2024-11-09 07:17:58,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 69. [2024-11-09 07:17:58,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 68 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) [2024-11-09 07:17:58,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2024-11-09 07:17:58,446 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 63 [2024-11-09 07:17:58,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:17:58,447 INFO L471 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2024-11-09 07:17:58,447 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 4.25) internal successors, (68), 15 states have internal predecessors, (68), 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) [2024-11-09 07:17:58,447 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2024-11-09 07:17:58,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2024-11-09 07:17:58,449 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:17:58,449 INFO L215 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1] [2024-11-09 07:17:58,469 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2024-11-09 07:17:58,649 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:58,650 INFO L396 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:17:58,650 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:17:58,650 INFO L85 PathProgramCache]: Analyzing trace with hash -1912401677, now seen corresponding path program 19 times [2024-11-09 07:17:58,650 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:17:58,650 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1908179349] [2024-11-09 07:17:58,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:17:58,650 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:17:58,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:59,183 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 173 proven. 137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:59,183 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:17:59,183 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1908179349] [2024-11-09 07:17:59,184 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1908179349] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:17:59,184 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [459769180] [2024-11-09 07:17:59,184 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:17:59,184 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:17:59,184 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:17:59,186 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:17:59,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2024-11-09 07:17:59,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:17:59,297 INFO L255 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 24 conjuncts are in the unsatisfiable core [2024-11-09 07:17:59,299 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:17:59,914 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 210 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:17:59,915 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:18:00,320 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 210 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:00,320 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [459769180] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:18:00,321 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [894475058] [2024-11-09 07:18:00,322 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:18:00,323 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:18:00,323 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:18:00,324 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:18:00,324 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:18:00,522 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:18:01,340 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7583#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:18:01,341 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:18:01,341 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:18:01,341 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 37 [2024-11-09 07:18:01,342 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327021793] [2024-11-09 07:18:01,342 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:18:01,342 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2024-11-09 07:18:01,343 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:18:01,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2024-11-09 07:18:01,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=1706, Unknown=0, NotChecked=0, Total=2070 [2024-11-09 07:18:01,346 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 38 states, 38 states have (on average 3.0789473684210527) internal successors, (117), 37 states have internal predecessors, (117), 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) [2024-11-09 07:18:01,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:18:01,656 INFO L93 Difference]: Finished difference Result 119 states and 123 transitions. [2024-11-09 07:18:01,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2024-11-09 07:18:01,657 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.0789473684210527) internal successors, (117), 37 states have internal predecessors, (117), 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 67 [2024-11-09 07:18:01,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:18:01,658 INFO L225 Difference]: With dead ends: 119 [2024-11-09 07:18:01,658 INFO L226 Difference]: Without dead ends: 71 [2024-11-09 07:18:01,659 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 158 SyntacticMatches, 21 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1144 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=364, Invalid=1706, Unknown=0, NotChecked=0, Total=2070 [2024-11-09 07:18:01,660 INFO L432 NwaCegarLoop]: 13 mSDtfsCounter, 1 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 333 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 333 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:18:01,661 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 116 Invalid, 334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 333 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:18:01,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2024-11-09 07:18:01,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2024-11-09 07:18:01,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 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) [2024-11-09 07:18:01,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2024-11-09 07:18:01,671 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 67 [2024-11-09 07:18:01,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:18:01,671 INFO L471 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2024-11-09 07:18:01,672 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 3.0789473684210527) internal successors, (117), 37 states have internal predecessors, (117), 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) [2024-11-09 07:18:01,672 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2024-11-09 07:18:01,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2024-11-09 07:18:01,673 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:18:01,674 INFO L215 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 1, 1, 1, 1, 1] [2024-11-09 07:18:01,700 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2024-11-09 07:18:01,874 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2024-11-09 07:18:01,875 INFO L396 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:18:01,875 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:18:01,875 INFO L85 PathProgramCache]: Analyzing trace with hash -1167271304, now seen corresponding path program 20 times [2024-11-09 07:18:01,875 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:18:01,876 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1295353529] [2024-11-09 07:18:01,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:18:01,876 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:18:01,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:18:02,366 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 100 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:02,366 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:18:02,367 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1295353529] [2024-11-09 07:18:02,367 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1295353529] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:18:02,367 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [434605294] [2024-11-09 07:18:02,367 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:18:02,367 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:18:02,368 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:18:02,370 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:18:02,374 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2024-11-09 07:18:02,517 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2024-11-09 07:18:02,518 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:18:02,520 INFO L255 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 28 conjuncts are in the unsatisfiable core [2024-11-09 07:18:02,523 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:18:02,687 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 121 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:02,687 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:18:03,027 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 121 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:03,027 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [434605294] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:18:03,027 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [227642489] [2024-11-09 07:18:03,029 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:18:03,029 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:18:03,029 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:18:03,029 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:18:03,030 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:18:03,214 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:18:03,728 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8264#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:18:03,729 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:18:03,729 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:18:03,729 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 16 [2024-11-09 07:18:03,729 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107250185] [2024-11-09 07:18:03,729 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:18:03,730 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2024-11-09 07:18:03,730 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:18:03,730 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2024-11-09 07:18:03,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=473, Unknown=0, NotChecked=0, Total=600 [2024-11-09 07:18:03,731 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 17 states, 17 states have (on average 4.352941176470588) internal successors, (74), 16 states have internal predecessors, (74), 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) [2024-11-09 07:18:04,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:18:04,047 INFO L93 Difference]: Finished difference Result 84 states and 86 transitions. [2024-11-09 07:18:04,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2024-11-09 07:18:04,049 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 4.352941176470588) internal successors, (74), 16 states have internal predecessors, (74), 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 69 [2024-11-09 07:18:04,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:18:04,050 INFO L225 Difference]: With dead ends: 84 [2024-11-09 07:18:04,050 INFO L226 Difference]: Without dead ends: 82 [2024-11-09 07:18:04,051 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 184 SyntacticMatches, 22 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 456 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=303, Invalid=957, Unknown=0, NotChecked=0, Total=1260 [2024-11-09 07:18:04,052 INFO L432 NwaCegarLoop]: 18 mSDtfsCounter, 11 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:18:04,052 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 92 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:18:04,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2024-11-09 07:18:04,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 75. [2024-11-09 07:18:04,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.0405405405405406) internal successors, (77), 74 states have internal predecessors, (77), 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) [2024-11-09 07:18:04,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 77 transitions. [2024-11-09 07:18:04,059 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 77 transitions. Word has length 69 [2024-11-09 07:18:04,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:18:04,060 INFO L471 AbstractCegarLoop]: Abstraction has 75 states and 77 transitions. [2024-11-09 07:18:04,060 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 4.352941176470588) internal successors, (74), 16 states have internal predecessors, (74), 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) [2024-11-09 07:18:04,060 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 77 transitions. [2024-11-09 07:18:04,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2024-11-09 07:18:04,061 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:18:04,061 INFO L215 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1] [2024-11-09 07:18:04,086 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2024-11-09 07:18:04,265 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2024-11-09 07:18:04,266 INFO L396 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:18:04,266 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:18:04,266 INFO L85 PathProgramCache]: Analyzing trace with hash -1276074208, now seen corresponding path program 21 times [2024-11-09 07:18:04,266 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:18:04,267 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [748750132] [2024-11-09 07:18:04,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:18:04,267 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:18:04,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:18:04,965 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 212 proven. 162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:04,965 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:18:04,965 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [748750132] [2024-11-09 07:18:04,965 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [748750132] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:18:04,966 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1360855681] [2024-11-09 07:18:04,966 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:18:04,966 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:18:04,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:18:04,968 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:18:04,970 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2024-11-09 07:18:05,091 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:18:05,092 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:18:05,094 INFO L255 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 26 conjuncts are in the unsatisfiable core [2024-11-09 07:18:05,105 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:18:05,708 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 253 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:05,709 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:18:06,164 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 253 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:06,164 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1360855681] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:18:06,165 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [876616290] [2024-11-09 07:18:06,166 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:18:06,167 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:18:06,167 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:18:06,167 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:18:06,167 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:18:06,399 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:18:07,079 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8975#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:18:07,079 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:18:07,079 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:18:07,079 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 40 [2024-11-09 07:18:07,080 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223978200] [2024-11-09 07:18:07,080 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:18:07,081 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2024-11-09 07:18:07,081 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:18:07,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2024-11-09 07:18:07,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=418, Invalid=1934, Unknown=0, NotChecked=0, Total=2352 [2024-11-09 07:18:07,083 INFO L87 Difference]: Start difference. First operand 75 states and 77 transitions. Second operand has 41 states, 41 states have (on average 3.097560975609756) internal successors, (127), 40 states have internal predecessors, (127), 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) [2024-11-09 07:18:07,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:18:07,405 INFO L93 Difference]: Finished difference Result 129 states and 133 transitions. [2024-11-09 07:18:07,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2024-11-09 07:18:07,406 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 3.097560975609756) internal successors, (127), 40 states have internal predecessors, (127), 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 73 [2024-11-09 07:18:07,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:18:07,407 INFO L225 Difference]: With dead ends: 129 [2024-11-09 07:18:07,407 INFO L226 Difference]: Without dead ends: 77 [2024-11-09 07:18:07,408 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 173 SyntacticMatches, 23 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1320 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=418, Invalid=1934, Unknown=0, NotChecked=0, Total=2352 [2024-11-09 07:18:07,411 INFO L432 NwaCegarLoop]: 14 mSDtfsCounter, 1 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 337 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 338 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:18:07,411 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 114 Invalid, 338 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 337 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:18:07,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2024-11-09 07:18:07,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2024-11-09 07:18:07,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.0394736842105263) internal successors, (79), 76 states have internal predecessors, (79), 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) [2024-11-09 07:18:07,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2024-11-09 07:18:07,418 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 73 [2024-11-09 07:18:07,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:18:07,419 INFO L471 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2024-11-09 07:18:07,419 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 3.097560975609756) internal successors, (127), 40 states have internal predecessors, (127), 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) [2024-11-09 07:18:07,419 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2024-11-09 07:18:07,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2024-11-09 07:18:07,420 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:18:07,420 INFO L215 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 1, 1, 1, 1, 1] [2024-11-09 07:18:07,446 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2024-11-09 07:18:07,621 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:18:07,622 INFO L396 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:18:07,622 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:18:07,622 INFO L85 PathProgramCache]: Analyzing trace with hash 1841068261, now seen corresponding path program 22 times [2024-11-09 07:18:07,622 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:18:07,625 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1089483952] [2024-11-09 07:18:07,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:18:07,625 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:18:07,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:18:08,150 INFO L134 CoverageAnalysis]: Checked inductivity of 397 backedges. 121 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:08,151 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:18:08,151 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1089483952] [2024-11-09 07:18:08,151 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1089483952] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:18:08,151 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1107589721] [2024-11-09 07:18:08,152 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:18:08,152 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:18:08,152 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:18:08,155 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:18:08,157 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2024-11-09 07:18:08,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:18:08,280 INFO L255 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 27 conjuncts are in the unsatisfiable core [2024-11-09 07:18:08,283 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:18:08,489 INFO L134 CoverageAnalysis]: Checked inductivity of 397 backedges. 144 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:08,489 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:18:08,984 INFO L134 CoverageAnalysis]: Checked inductivity of 397 backedges. 144 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:08,985 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1107589721] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:18:08,985 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [489004853] [2024-11-09 07:18:08,987 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:18:08,987 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:18:08,990 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:18:08,990 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:18:08,991 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:18:09,234 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:18:09,885 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9714#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:18:09,885 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:18:09,886 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:18:09,886 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 17 [2024-11-09 07:18:09,886 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [113422665] [2024-11-09 07:18:09,886 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:18:09,887 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2024-11-09 07:18:09,887 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:18:09,887 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2024-11-09 07:18:09,887 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=509, Unknown=0, NotChecked=0, Total=650 [2024-11-09 07:18:09,888 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand has 18 states, 18 states have (on average 4.444444444444445) internal successors, (80), 17 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:18:10,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:18:10,211 INFO L93 Difference]: Finished difference Result 90 states and 92 transitions. [2024-11-09 07:18:10,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2024-11-09 07:18:10,211 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 4.444444444444445) internal successors, (80), 17 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2024-11-09 07:18:10,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:18:10,212 INFO L225 Difference]: With dead ends: 90 [2024-11-09 07:18:10,213 INFO L226 Difference]: Without dead ends: 88 [2024-11-09 07:18:10,214 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 200 SyntacticMatches, 25 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=345, Invalid=1061, Unknown=0, NotChecked=0, Total=1406 [2024-11-09 07:18:10,214 INFO L432 NwaCegarLoop]: 19 mSDtfsCounter, 14 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:18:10,215 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 101 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:18:10,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2024-11-09 07:18:10,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 81. [2024-11-09 07:18:10,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 80 states have (on average 1.0375) internal successors, (83), 80 states have internal predecessors, (83), 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) [2024-11-09 07:18:10,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 83 transitions. [2024-11-09 07:18:10,222 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 83 transitions. Word has length 75 [2024-11-09 07:18:10,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:18:10,223 INFO L471 AbstractCegarLoop]: Abstraction has 81 states and 83 transitions. [2024-11-09 07:18:10,223 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 4.444444444444445) internal successors, (80), 17 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:18:10,223 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 83 transitions. [2024-11-09 07:18:10,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2024-11-09 07:18:10,224 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:18:10,225 INFO L215 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1] [2024-11-09 07:18:10,255 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2024-11-09 07:18:10,425 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:18:10,426 INFO L396 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:18:10,426 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:18:10,426 INFO L85 PathProgramCache]: Analyzing trace with hash -532592883, now seen corresponding path program 23 times [2024-11-09 07:18:10,426 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:18:10,426 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1081535977] [2024-11-09 07:18:10,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:18:10,427 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:18:10,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:18:11,238 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 255 proven. 189 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:11,239 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:18:11,239 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1081535977] [2024-11-09 07:18:11,239 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1081535977] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:18:11,239 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [128589776] [2024-11-09 07:18:11,239 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:18:11,240 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:18:11,240 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:18:11,241 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:18:11,242 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2024-11-09 07:18:11,376 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2024-11-09 07:18:11,377 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:18:11,379 INFO L255 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 28 conjuncts are in the unsatisfiable core [2024-11-09 07:18:11,380 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:18:12,105 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 300 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:12,106 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:18:12,614 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 300 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:12,615 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [128589776] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:18:12,615 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [53217232] [2024-11-09 07:18:12,616 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:18:12,617 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:18:12,617 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:18:12,617 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:18:12,618 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:18:12,800 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:18:13,553 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10482#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:18:13,553 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:18:13,553 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:18:13,554 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 43 [2024-11-09 07:18:13,554 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [627722870] [2024-11-09 07:18:13,554 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:18:13,555 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2024-11-09 07:18:13,555 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:18:13,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2024-11-09 07:18:13,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=476, Invalid=2176, Unknown=0, NotChecked=0, Total=2652 [2024-11-09 07:18:13,557 INFO L87 Difference]: Start difference. First operand 81 states and 83 transitions. Second operand has 44 states, 44 states have (on average 3.1136363636363638) internal successors, (137), 43 states have internal predecessors, (137), 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) [2024-11-09 07:18:13,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:18:13,880 INFO L93 Difference]: Finished difference Result 139 states and 143 transitions. [2024-11-09 07:18:13,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2024-11-09 07:18:13,881 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 3.1136363636363638) internal successors, (137), 43 states have internal predecessors, (137), 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 79 [2024-11-09 07:18:13,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:18:13,883 INFO L225 Difference]: With dead ends: 139 [2024-11-09 07:18:13,883 INFO L226 Difference]: Without dead ends: 83 [2024-11-09 07:18:13,885 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 188 SyntacticMatches, 25 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1508 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=476, Invalid=2176, Unknown=0, NotChecked=0, Total=2652 [2024-11-09 07:18:13,886 INFO L432 NwaCegarLoop]: 15 mSDtfsCounter, 1 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 345 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 346 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 345 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:18:13,886 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 116 Invalid, 346 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 345 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:18:13,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2024-11-09 07:18:13,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2024-11-09 07:18:13,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 82 states have internal predecessors, (85), 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) [2024-11-09 07:18:13,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2024-11-09 07:18:13,895 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 79 [2024-11-09 07:18:13,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:18:13,896 INFO L471 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2024-11-09 07:18:13,896 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 3.1136363636363638) internal successors, (137), 43 states have internal predecessors, (137), 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) [2024-11-09 07:18:13,897 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2024-11-09 07:18:13,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2024-11-09 07:18:13,898 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:18:13,898 INFO L215 NwaCegarLoop]: trace histogram [13, 13, 13, 13, 12, 12, 1, 1, 1, 1, 1] [2024-11-09 07:18:13,929 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2024-11-09 07:18:14,099 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:18:14,099 INFO L396 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:18:14,100 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:18:14,100 INFO L85 PathProgramCache]: Analyzing trace with hash -2124943086, now seen corresponding path program 24 times [2024-11-09 07:18:14,100 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:18:14,100 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2012140078] [2024-11-09 07:18:14,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:18:14,100 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:18:14,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:18:14,674 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 144 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:14,674 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:18:14,674 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2012140078] [2024-11-09 07:18:14,674 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2012140078] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:18:14,674 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1084740224] [2024-11-09 07:18:14,674 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:18:14,675 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:18:14,675 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:18:14,677 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:18:14,681 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2024-11-09 07:18:14,819 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:18:14,819 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:18:14,823 INFO L255 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 32 conjuncts are in the unsatisfiable core [2024-11-09 07:18:14,826 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:18:15,040 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 169 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:15,040 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:18:15,525 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 169 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:15,525 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1084740224] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:18:15,526 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1466200726] [2024-11-09 07:18:15,527 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:18:15,528 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:18:15,528 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:18:15,529 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:18:15,529 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:18:15,805 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:18:16,284 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11279#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:18:16,284 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:18:16,284 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:18:16,284 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 18 [2024-11-09 07:18:16,285 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926314667] [2024-11-09 07:18:16,285 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:18:16,285 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2024-11-09 07:18:16,285 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:18:16,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2024-11-09 07:18:16,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=546, Unknown=0, NotChecked=0, Total=702 [2024-11-09 07:18:16,287 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand has 19 states, 19 states have (on average 4.526315789473684) internal successors, (86), 18 states have internal predecessors, (86), 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) [2024-11-09 07:18:16,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:18:16,639 INFO L93 Difference]: Finished difference Result 96 states and 98 transitions. [2024-11-09 07:18:16,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2024-11-09 07:18:16,640 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 4.526315789473684) internal successors, (86), 18 states have internal predecessors, (86), 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 81 [2024-11-09 07:18:16,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:18:16,641 INFO L225 Difference]: With dead ends: 96 [2024-11-09 07:18:16,641 INFO L226 Difference]: Without dead ends: 94 [2024-11-09 07:18:16,642 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 218 SyntacticMatches, 26 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 588 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=390, Invalid=1170, Unknown=0, NotChecked=0, Total=1560 [2024-11-09 07:18:16,642 INFO L432 NwaCegarLoop]: 20 mSDtfsCounter, 12 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:18:16,643 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 135 Invalid, 148 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:18:16,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2024-11-09 07:18:16,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 87. [2024-11-09 07:18:16,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 86 states have (on average 1.0348837209302326) internal successors, (89), 86 states have internal predecessors, (89), 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) [2024-11-09 07:18:16,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2024-11-09 07:18:16,652 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 81 [2024-11-09 07:18:16,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:18:16,652 INFO L471 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2024-11-09 07:18:16,652 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 4.526315789473684) internal successors, (86), 18 states have internal predecessors, (86), 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) [2024-11-09 07:18:16,653 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2024-11-09 07:18:16,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2024-11-09 07:18:16,653 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:18:16,653 INFO L215 NwaCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1] [2024-11-09 07:18:16,676 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2024-11-09 07:18:16,854 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2024-11-09 07:18:16,854 INFO L396 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:18:16,855 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:18:16,855 INFO L85 PathProgramCache]: Analyzing trace with hash 1272635578, now seen corresponding path program 25 times [2024-11-09 07:18:16,855 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:18:16,855 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [846642210] [2024-11-09 07:18:16,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:18:16,855 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:18:16,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:18:17,816 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 302 proven. 218 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:17,816 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:18:17,817 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [846642210] [2024-11-09 07:18:17,817 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [846642210] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:18:17,817 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [132291355] [2024-11-09 07:18:17,817 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:18:17,817 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:18:17,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:18:17,819 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:18:17,820 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2024-11-09 07:18:17,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:18:17,958 INFO L255 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 30 conjuncts are in the unsatisfiable core [2024-11-09 07:18:17,961 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:18:18,801 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 351 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:18,801 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:18:19,406 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 351 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:19,407 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [132291355] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:18:19,407 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1822801553] [2024-11-09 07:18:19,408 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:18:19,409 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:18:19,409 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:18:19,409 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:18:19,410 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:18:19,577 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:18:20,362 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12104#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:18:20,362 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:18:20,362 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:18:20,362 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 46 [2024-11-09 07:18:20,362 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1587913397] [2024-11-09 07:18:20,362 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:18:20,363 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2024-11-09 07:18:20,363 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:18:20,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2024-11-09 07:18:20,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=538, Invalid=2432, Unknown=0, NotChecked=0, Total=2970 [2024-11-09 07:18:20,366 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand has 47 states, 47 states have (on average 3.127659574468085) internal successors, (147), 46 states have internal predecessors, (147), 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) [2024-11-09 07:18:20,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:18:20,766 INFO L93 Difference]: Finished difference Result 149 states and 153 transitions. [2024-11-09 07:18:20,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2024-11-09 07:18:20,766 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 3.127659574468085) internal successors, (147), 46 states have internal predecessors, (147), 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 85 [2024-11-09 07:18:20,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:18:20,767 INFO L225 Difference]: With dead ends: 149 [2024-11-09 07:18:20,767 INFO L226 Difference]: Without dead ends: 89 [2024-11-09 07:18:20,768 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 203 SyntacticMatches, 27 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1708 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=538, Invalid=2432, Unknown=0, NotChecked=0, Total=2970 [2024-11-09 07:18:20,769 INFO L432 NwaCegarLoop]: 16 mSDtfsCounter, 1 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 510 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 511 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 510 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-09 07:18:20,770 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 178 Invalid, 511 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 510 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-09 07:18:20,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2024-11-09 07:18:20,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2024-11-09 07:18:20,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 88 states have (on average 1.0340909090909092) internal successors, (91), 88 states have internal predecessors, (91), 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) [2024-11-09 07:18:20,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 91 transitions. [2024-11-09 07:18:20,778 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 91 transitions. Word has length 85 [2024-11-09 07:18:20,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:18:20,778 INFO L471 AbstractCegarLoop]: Abstraction has 89 states and 91 transitions. [2024-11-09 07:18:20,779 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 3.127659574468085) internal successors, (147), 46 states have internal predecessors, (147), 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) [2024-11-09 07:18:20,779 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 91 transitions. [2024-11-09 07:18:20,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2024-11-09 07:18:20,780 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:18:20,780 INFO L215 NwaCegarLoop]: trace histogram [14, 14, 14, 14, 13, 13, 1, 1, 1, 1, 1] [2024-11-09 07:18:20,812 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2024-11-09 07:18:20,981 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2024-11-09 07:18:20,981 INFO L396 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:18:20,981 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:18:20,982 INFO L85 PathProgramCache]: Analyzing trace with hash 810103551, now seen corresponding path program 26 times [2024-11-09 07:18:20,982 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:18:20,982 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [442461212] [2024-11-09 07:18:20,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:18:20,982 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:18:21,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:18:21,676 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 169 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:21,676 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:18:21,676 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [442461212] [2024-11-09 07:18:21,676 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [442461212] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:18:21,676 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [667353036] [2024-11-09 07:18:21,677 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:18:21,677 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:18:21,677 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:18:21,680 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:18:21,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2024-11-09 07:18:21,851 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2024-11-09 07:18:21,851 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:18:21,853 INFO L255 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 34 conjuncts are in the unsatisfiable core [2024-11-09 07:18:21,855 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:18:22,009 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 196 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:22,009 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:18:22,389 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 196 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:22,389 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [667353036] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:18:22,389 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2028293356] [2024-11-09 07:18:22,391 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:18:22,391 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:18:22,391 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:18:22,391 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:18:22,392 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:18:22,569 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:18:23,064 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12959#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:18:23,064 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:18:23,064 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:18:23,064 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 19 [2024-11-09 07:18:23,064 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001617547] [2024-11-09 07:18:23,064 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:18:23,065 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-09 07:18:23,065 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:18:23,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-09 07:18:23,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=584, Unknown=0, NotChecked=0, Total=756 [2024-11-09 07:18:23,066 INFO L87 Difference]: Start difference. First operand 89 states and 91 transitions. Second operand has 20 states, 20 states have (on average 4.6) internal successors, (92), 19 states have internal predecessors, (92), 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) [2024-11-09 07:18:23,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:18:23,410 INFO L93 Difference]: Finished difference Result 102 states and 104 transitions. [2024-11-09 07:18:23,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2024-11-09 07:18:23,411 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 4.6) internal successors, (92), 19 states have internal predecessors, (92), 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 87 [2024-11-09 07:18:23,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:18:23,412 INFO L225 Difference]: With dead ends: 102 [2024-11-09 07:18:23,412 INFO L226 Difference]: Without dead ends: 100 [2024-11-09 07:18:23,413 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 235 SyntacticMatches, 28 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 660 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=438, Invalid=1284, Unknown=0, NotChecked=0, Total=1722 [2024-11-09 07:18:23,413 INFO L432 NwaCegarLoop]: 21 mSDtfsCounter, 12 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 133 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:18:23,413 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 119 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 133 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:18:23,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2024-11-09 07:18:23,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 93. [2024-11-09 07:18:23,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.0326086956521738) internal successors, (95), 92 states have internal predecessors, (95), 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) [2024-11-09 07:18:23,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2024-11-09 07:18:23,421 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 87 [2024-11-09 07:18:23,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:18:23,422 INFO L471 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2024-11-09 07:18:23,422 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 4.6) internal successors, (92), 19 states have internal predecessors, (92), 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) [2024-11-09 07:18:23,423 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2024-11-09 07:18:23,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2024-11-09 07:18:23,423 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:18:23,423 INFO L215 NwaCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1] [2024-11-09 07:18:23,445 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2024-11-09 07:18:23,624 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2024-11-09 07:18:23,624 INFO L396 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:18:23,625 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:18:23,625 INFO L85 PathProgramCache]: Analyzing trace with hash -1152424921, now seen corresponding path program 27 times [2024-11-09 07:18:23,625 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:18:23,626 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [187553735] [2024-11-09 07:18:23,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:18:23,626 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:18:23,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:18:24,709 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 353 proven. 249 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:24,709 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:18:24,710 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [187553735] [2024-11-09 07:18:24,710 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [187553735] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:18:24,710 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2090273297] [2024-11-09 07:18:24,710 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:18:24,711 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:18:24,711 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:18:24,713 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:18:24,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2024-11-09 07:18:24,868 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:18:24,868 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:18:24,871 INFO L255 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 32 conjuncts are in the unsatisfiable core [2024-11-09 07:18:24,874 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:18:25,955 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 406 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:25,955 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:18:26,628 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 406 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:26,628 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2090273297] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:18:26,628 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1594388794] [2024-11-09 07:18:26,630 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:18:26,630 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:18:26,630 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:18:26,631 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:18:26,631 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:18:26,797 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:18:27,565 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13841#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:18:27,565 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:18:27,565 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:18:27,566 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 49 [2024-11-09 07:18:27,566 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123964082] [2024-11-09 07:18:27,566 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:18:27,567 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2024-11-09 07:18:27,567 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:18:27,568 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2024-11-09 07:18:27,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=604, Invalid=2702, Unknown=0, NotChecked=0, Total=3306 [2024-11-09 07:18:27,570 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand has 50 states, 50 states have (on average 3.14) internal successors, (157), 49 states have internal predecessors, (157), 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) [2024-11-09 07:18:27,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:18:27,990 INFO L93 Difference]: Finished difference Result 159 states and 163 transitions. [2024-11-09 07:18:27,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2024-11-09 07:18:27,990 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 3.14) internal successors, (157), 49 states have internal predecessors, (157), 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 91 [2024-11-09 07:18:27,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:18:27,992 INFO L225 Difference]: With dead ends: 159 [2024-11-09 07:18:27,992 INFO L226 Difference]: Without dead ends: 95 [2024-11-09 07:18:27,994 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 218 SyntacticMatches, 29 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1920 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=604, Invalid=2702, Unknown=0, NotChecked=0, Total=3306 [2024-11-09 07:18:27,995 INFO L432 NwaCegarLoop]: 17 mSDtfsCounter, 1 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 515 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 516 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 515 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-09 07:18:27,995 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 177 Invalid, 516 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 515 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-09 07:18:27,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2024-11-09 07:18:28,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2024-11-09 07:18:28,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.0319148936170213) internal successors, (97), 94 states have internal predecessors, (97), 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) [2024-11-09 07:18:28,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2024-11-09 07:18:28,005 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 91 [2024-11-09 07:18:28,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:18:28,006 INFO L471 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2024-11-09 07:18:28,006 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 3.14) internal successors, (157), 49 states have internal predecessors, (157), 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) [2024-11-09 07:18:28,006 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2024-11-09 07:18:28,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2024-11-09 07:18:28,007 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:18:28,008 INFO L215 NwaCegarLoop]: trace histogram [15, 15, 15, 15, 14, 14, 1, 1, 1, 1, 1] [2024-11-09 07:18:28,035 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2024-11-09 07:18:28,211 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2024-11-09 07:18:28,212 INFO L396 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:18:28,212 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:18:28,212 INFO L85 PathProgramCache]: Analyzing trace with hash 373698220, now seen corresponding path program 28 times [2024-11-09 07:18:28,213 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:18:28,213 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1671861899] [2024-11-09 07:18:28,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:18:28,213 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:18:28,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:18:28,951 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 196 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:28,951 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:18:28,952 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1671861899] [2024-11-09 07:18:28,952 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1671861899] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:18:28,952 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1392843334] [2024-11-09 07:18:28,952 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:18:28,953 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:18:28,953 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:18:28,955 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:18:28,959 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2024-11-09 07:18:29,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:18:29,106 INFO L255 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 33 conjuncts are in the unsatisfiable core [2024-11-09 07:18:29,109 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:18:29,320 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 225 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:29,320 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:18:29,844 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 225 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:29,845 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1392843334] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:18:29,845 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2019290841] [2024-11-09 07:18:29,846 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:18:29,846 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:18:29,847 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:18:29,847 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:18:29,847 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:18:30,040 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:18:30,535 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14754#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:18:30,535 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:18:30,535 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:18:30,535 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 20 [2024-11-09 07:18:30,535 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528904370] [2024-11-09 07:18:30,536 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:18:30,536 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2024-11-09 07:18:30,536 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:18:30,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2024-11-09 07:18:30,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=623, Unknown=0, NotChecked=0, Total=812 [2024-11-09 07:18:30,537 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand has 21 states, 21 states have (on average 4.666666666666667) internal successors, (98), 20 states have internal predecessors, (98), 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) [2024-11-09 07:18:30,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:18:30,912 INFO L93 Difference]: Finished difference Result 108 states and 110 transitions. [2024-11-09 07:18:30,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2024-11-09 07:18:30,913 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 4.666666666666667) internal successors, (98), 20 states have internal predecessors, (98), 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 93 [2024-11-09 07:18:30,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:18:30,914 INFO L225 Difference]: With dead ends: 108 [2024-11-09 07:18:30,914 INFO L226 Difference]: Without dead ends: 106 [2024-11-09 07:18:30,915 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 324 GetRequests, 251 SyntacticMatches, 31 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 751 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=489, Invalid=1403, Unknown=0, NotChecked=0, Total=1892 [2024-11-09 07:18:30,916 INFO L432 NwaCegarLoop]: 22 mSDtfsCounter, 11 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:18:30,917 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 149 Invalid, 164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:18:30,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2024-11-09 07:18:30,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 99. [2024-11-09 07:18:30,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.030612244897959) internal successors, (101), 98 states have internal predecessors, (101), 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) [2024-11-09 07:18:30,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 101 transitions. [2024-11-09 07:18:30,925 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 101 transitions. Word has length 93 [2024-11-09 07:18:30,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:18:30,926 INFO L471 AbstractCegarLoop]: Abstraction has 99 states and 101 transitions. [2024-11-09 07:18:30,926 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 4.666666666666667) internal successors, (98), 20 states have internal predecessors, (98), 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) [2024-11-09 07:18:30,926 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 101 transitions. [2024-11-09 07:18:30,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2024-11-09 07:18:30,927 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:18:30,927 INFO L215 NwaCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1] [2024-11-09 07:18:30,946 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2024-11-09 07:18:31,128 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:18:31,128 INFO L396 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:18:31,128 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:18:31,129 INFO L85 PathProgramCache]: Analyzing trace with hash 501006676, now seen corresponding path program 29 times [2024-11-09 07:18:31,129 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:18:31,129 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [762740076] [2024-11-09 07:18:31,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:18:31,129 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:18:31,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:18:32,332 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 408 proven. 282 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:32,333 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:18:32,333 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [762740076] [2024-11-09 07:18:32,333 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [762740076] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:18:32,333 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1196001666] [2024-11-09 07:18:32,333 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:18:32,334 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:18:32,334 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:18:32,338 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:18:32,346 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2024-11-09 07:18:32,543 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2024-11-09 07:18:32,544 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:18:32,547 INFO L255 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 34 conjuncts are in the unsatisfiable core [2024-11-09 07:18:32,549 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:18:33,581 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 465 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:33,581 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:18:34,339 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 465 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:34,339 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1196001666] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:18:34,340 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [646433760] [2024-11-09 07:18:34,341 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:18:34,341 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:18:34,341 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:18:34,341 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:18:34,341 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:18:34,565 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:18:35,307 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15693#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:18:35,307 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:18:35,307 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:18:35,307 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 52 [2024-11-09 07:18:35,308 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [344977501] [2024-11-09 07:18:35,308 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:18:35,308 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2024-11-09 07:18:35,308 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:18:35,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2024-11-09 07:18:35,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=674, Invalid=2986, Unknown=0, NotChecked=0, Total=3660 [2024-11-09 07:18:35,311 INFO L87 Difference]: Start difference. First operand 99 states and 101 transitions. Second operand has 53 states, 53 states have (on average 3.150943396226415) internal successors, (167), 52 states have internal predecessors, (167), 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) [2024-11-09 07:18:35,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:18:35,708 INFO L93 Difference]: Finished difference Result 169 states and 173 transitions. [2024-11-09 07:18:35,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2024-11-09 07:18:35,709 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 3.150943396226415) internal successors, (167), 52 states have internal predecessors, (167), 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 97 [2024-11-09 07:18:35,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:18:35,710 INFO L225 Difference]: With dead ends: 169 [2024-11-09 07:18:35,710 INFO L226 Difference]: Without dead ends: 101 [2024-11-09 07:18:35,711 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 233 SyntacticMatches, 31 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2144 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=674, Invalid=2986, Unknown=0, NotChecked=0, Total=3660 [2024-11-09 07:18:35,712 INFO L432 NwaCegarLoop]: 18 mSDtfsCounter, 1 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 446 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 447 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 446 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:18:35,712 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 149 Invalid, 447 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 446 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:18:35,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2024-11-09 07:18:35,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2024-11-09 07:18:35,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 100 states have (on average 1.03) internal successors, (103), 100 states have internal predecessors, (103), 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) [2024-11-09 07:18:35,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2024-11-09 07:18:35,723 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 97 [2024-11-09 07:18:35,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:18:35,724 INFO L471 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2024-11-09 07:18:35,724 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 3.150943396226415) internal successors, (167), 52 states have internal predecessors, (167), 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) [2024-11-09 07:18:35,725 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2024-11-09 07:18:35,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2024-11-09 07:18:35,726 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:18:35,726 INFO L215 NwaCegarLoop]: trace histogram [16, 16, 16, 16, 15, 15, 1, 1, 1, 1, 1] [2024-11-09 07:18:35,754 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2024-11-09 07:18:35,930 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2024-11-09 07:18:35,931 INFO L396 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:18:35,931 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:18:35,931 INFO L85 PathProgramCache]: Analyzing trace with hash 246469657, now seen corresponding path program 30 times [2024-11-09 07:18:35,931 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:18:35,932 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387491291] [2024-11-09 07:18:35,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:18:35,932 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:18:35,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:18:36,784 INFO L134 CoverageAnalysis]: Checked inductivity of 721 backedges. 225 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:36,785 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:18:36,785 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [387491291] [2024-11-09 07:18:36,785 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [387491291] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:18:36,785 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1781943675] [2024-11-09 07:18:36,785 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:18:36,786 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:18:36,786 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:18:36,789 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:18:36,791 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2024-11-09 07:18:36,978 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:18:36,978 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:18:36,982 INFO L255 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 38 conjuncts are in the unsatisfiable core [2024-11-09 07:18:36,984 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:18:37,171 INFO L134 CoverageAnalysis]: Checked inductivity of 721 backedges. 256 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:37,172 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:18:37,675 INFO L134 CoverageAnalysis]: Checked inductivity of 721 backedges. 256 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:37,675 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1781943675] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:18:37,676 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [771021754] [2024-11-09 07:18:37,677 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:18:37,677 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:18:37,677 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:18:37,677 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:18:37,677 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:18:37,853 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:18:38,407 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16664#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:18:38,408 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:18:38,408 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:18:38,408 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 21 [2024-11-09 07:18:38,408 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345395323] [2024-11-09 07:18:38,408 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:18:38,408 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2024-11-09 07:18:38,409 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:18:38,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2024-11-09 07:18:38,410 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=663, Unknown=0, NotChecked=0, Total=870 [2024-11-09 07:18:38,410 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand has 22 states, 22 states have (on average 4.7272727272727275) internal successors, (104), 21 states have internal predecessors, (104), 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) [2024-11-09 07:18:38,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:18:38,870 INFO L93 Difference]: Finished difference Result 114 states and 116 transitions. [2024-11-09 07:18:38,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2024-11-09 07:18:38,871 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 4.7272727272727275) internal successors, (104), 21 states have internal predecessors, (104), 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 99 [2024-11-09 07:18:38,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:18:38,872 INFO L225 Difference]: With dead ends: 114 [2024-11-09 07:18:38,872 INFO L226 Difference]: Without dead ends: 112 [2024-11-09 07:18:38,873 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 269 SyntacticMatches, 32 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 816 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=543, Invalid=1527, Unknown=0, NotChecked=0, Total=2070 [2024-11-09 07:18:38,873 INFO L432 NwaCegarLoop]: 23 mSDtfsCounter, 13 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:18:38,874 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 147 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 165 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:18:38,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2024-11-09 07:18:38,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 105. [2024-11-09 07:18:38,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 104 states have (on average 1.0288461538461537) internal successors, (107), 104 states have internal predecessors, (107), 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) [2024-11-09 07:18:38,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2024-11-09 07:18:38,883 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 99 [2024-11-09 07:18:38,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:18:38,883 INFO L471 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2024-11-09 07:18:38,883 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 4.7272727272727275) internal successors, (104), 21 states have internal predecessors, (104), 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) [2024-11-09 07:18:38,884 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2024-11-09 07:18:38,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2024-11-09 07:18:38,884 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:18:38,884 INFO L215 NwaCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1] [2024-11-09 07:18:38,905 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2024-11-09 07:18:39,085 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:18:39,085 INFO L396 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:18:39,086 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:18:39,086 INFO L85 PathProgramCache]: Analyzing trace with hash -328406975, now seen corresponding path program 31 times [2024-11-09 07:18:39,086 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:18:39,086 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1130053013] [2024-11-09 07:18:39,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:18:39,087 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:18:39,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:18:40,255 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 467 proven. 317 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:40,256 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:18:40,256 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1130053013] [2024-11-09 07:18:40,256 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1130053013] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:18:40,256 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1912217616] [2024-11-09 07:18:40,257 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:18:40,257 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:18:40,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:18:40,259 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:18:40,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2024-11-09 07:18:40,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:18:40,425 INFO L255 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 36 conjuncts are in the unsatisfiable core [2024-11-09 07:18:40,427 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:18:41,668 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 528 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:41,668 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:18:42,466 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 528 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:42,467 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1912217616] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:18:42,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1233089143] [2024-11-09 07:18:42,468 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:18:42,468 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:18:42,469 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:18:42,469 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:18:42,469 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:18:42,734 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:18:43,578 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17660#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:18:43,579 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:18:43,579 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:18:43,579 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 55 [2024-11-09 07:18:43,579 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802641891] [2024-11-09 07:18:43,580 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:18:43,580 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2024-11-09 07:18:43,580 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:18:43,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2024-11-09 07:18:43,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=748, Invalid=3284, Unknown=0, NotChecked=0, Total=4032 [2024-11-09 07:18:43,582 INFO L87 Difference]: Start difference. First operand 105 states and 107 transitions. Second operand has 56 states, 56 states have (on average 3.1607142857142856) internal successors, (177), 55 states have internal predecessors, (177), 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) [2024-11-09 07:18:44,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:18:44,098 INFO L93 Difference]: Finished difference Result 179 states and 183 transitions. [2024-11-09 07:18:44,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2024-11-09 07:18:44,098 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 3.1607142857142856) internal successors, (177), 55 states have internal predecessors, (177), 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 103 [2024-11-09 07:18:44,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:18:44,100 INFO L225 Difference]: With dead ends: 179 [2024-11-09 07:18:44,100 INFO L226 Difference]: Without dead ends: 107 [2024-11-09 07:18:44,101 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 248 SyntacticMatches, 33 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2380 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=748, Invalid=3284, Unknown=0, NotChecked=0, Total=4032 [2024-11-09 07:18:44,102 INFO L432 NwaCegarLoop]: 19 mSDtfsCounter, 1 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 653 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 654 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 653 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-11-09 07:18:44,102 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 222 Invalid, 654 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 653 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-11-09 07:18:44,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2024-11-09 07:18:44,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2024-11-09 07:18:44,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 106 states have (on average 1.028301886792453) internal successors, (109), 106 states have internal predecessors, (109), 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) [2024-11-09 07:18:44,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2024-11-09 07:18:44,112 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 103 [2024-11-09 07:18:44,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:18:44,113 INFO L471 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2024-11-09 07:18:44,113 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 3.1607142857142856) internal successors, (177), 55 states have internal predecessors, (177), 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) [2024-11-09 07:18:44,113 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2024-11-09 07:18:44,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2024-11-09 07:18:44,114 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:18:44,114 INFO L215 NwaCegarLoop]: trace histogram [17, 17, 17, 17, 16, 16, 1, 1, 1, 1, 1] [2024-11-09 07:18:44,137 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2024-11-09 07:18:44,315 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:18:44,315 INFO L396 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:18:44,315 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:18:44,315 INFO L85 PathProgramCache]: Analyzing trace with hash -745073850, now seen corresponding path program 32 times [2024-11-09 07:18:44,315 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:18:44,316 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [416083006] [2024-11-09 07:18:44,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:18:44,316 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:18:44,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:18:45,120 INFO L134 CoverageAnalysis]: Checked inductivity of 817 backedges. 256 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:45,120 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:18:45,120 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [416083006] [2024-11-09 07:18:45,120 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [416083006] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:18:45,120 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1057015077] [2024-11-09 07:18:45,120 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:18:45,121 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:18:45,121 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:18:45,122 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:18:45,124 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2024-11-09 07:18:45,300 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2024-11-09 07:18:45,300 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:18:45,303 INFO L255 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 40 conjuncts are in the unsatisfiable core [2024-11-09 07:18:45,305 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:18:45,502 INFO L134 CoverageAnalysis]: Checked inductivity of 817 backedges. 289 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:45,502 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:18:46,126 INFO L134 CoverageAnalysis]: Checked inductivity of 817 backedges. 289 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:46,126 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1057015077] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:18:46,126 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [866053425] [2024-11-09 07:18:46,128 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:18:46,128 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:18:46,128 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:18:46,129 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:18:46,129 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:18:46,334 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:18:47,003 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18689#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:18:47,003 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:18:47,003 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:18:47,004 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 22 [2024-11-09 07:18:47,004 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259433417] [2024-11-09 07:18:47,004 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:18:47,005 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2024-11-09 07:18:47,005 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:18:47,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2024-11-09 07:18:47,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=704, Unknown=0, NotChecked=0, Total=930 [2024-11-09 07:18:47,006 INFO L87 Difference]: Start difference. First operand 107 states and 109 transitions. Second operand has 23 states, 23 states have (on average 4.782608695652174) internal successors, (110), 22 states have internal predecessors, (110), 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) [2024-11-09 07:18:47,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:18:47,582 INFO L93 Difference]: Finished difference Result 120 states and 122 transitions. [2024-11-09 07:18:47,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2024-11-09 07:18:47,583 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 4.782608695652174) internal successors, (110), 22 states have internal predecessors, (110), 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 105 [2024-11-09 07:18:47,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:18:47,584 INFO L225 Difference]: With dead ends: 120 [2024-11-09 07:18:47,584 INFO L226 Difference]: Without dead ends: 118 [2024-11-09 07:18:47,585 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 366 GetRequests, 286 SyntacticMatches, 34 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 900 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=600, Invalid=1656, Unknown=0, NotChecked=0, Total=2256 [2024-11-09 07:18:47,586 INFO L432 NwaCegarLoop]: 24 mSDtfsCounter, 14 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 07:18:47,586 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 137 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 07:18:47,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2024-11-09 07:18:47,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 111. [2024-11-09 07:18:47,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 110 states have (on average 1.0272727272727273) internal successors, (113), 110 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:18:47,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 113 transitions. [2024-11-09 07:18:47,597 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 113 transitions. Word has length 105 [2024-11-09 07:18:47,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:18:47,597 INFO L471 AbstractCegarLoop]: Abstraction has 111 states and 113 transitions. [2024-11-09 07:18:47,598 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 4.782608695652174) internal successors, (110), 22 states have internal predecessors, (110), 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) [2024-11-09 07:18:47,598 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 113 transitions. [2024-11-09 07:18:47,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2024-11-09 07:18:47,599 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:18:47,599 INFO L215 NwaCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1] [2024-11-09 07:18:47,621 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2024-11-09 07:18:47,800 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2024-11-09 07:18:47,800 INFO L396 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:18:47,800 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:18:47,801 INFO L85 PathProgramCache]: Analyzing trace with hash 1217775854, now seen corresponding path program 33 times [2024-11-09 07:18:47,801 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:18:47,801 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882043169] [2024-11-09 07:18:47,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:18:47,801 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:18:47,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:18:49,131 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 530 proven. 354 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:49,131 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:18:49,132 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882043169] [2024-11-09 07:18:49,132 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [882043169] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:18:49,132 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [726704976] [2024-11-09 07:18:49,132 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:18:49,133 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:18:49,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:18:49,135 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:18:49,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2024-11-09 07:18:49,332 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:18:49,332 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:18:49,337 INFO L255 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 38 conjuncts are in the unsatisfiable core [2024-11-09 07:18:49,341 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:18:50,677 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 595 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:50,677 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:18:51,725 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 595 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:51,726 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [726704976] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:18:51,726 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [768905767] [2024-11-09 07:18:51,727 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:18:51,727 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:18:51,728 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:18:51,728 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:18:51,728 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:18:51,944 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:18:52,855 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19742#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:18:52,855 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:18:52,855 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:18:52,855 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 58 [2024-11-09 07:18:52,856 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502964531] [2024-11-09 07:18:52,856 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:18:52,857 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2024-11-09 07:18:52,857 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:18:52,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2024-11-09 07:18:52,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=826, Invalid=3596, Unknown=0, NotChecked=0, Total=4422 [2024-11-09 07:18:52,859 INFO L87 Difference]: Start difference. First operand 111 states and 113 transitions. Second operand has 59 states, 59 states have (on average 3.169491525423729) internal successors, (187), 58 states have internal predecessors, (187), 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) [2024-11-09 07:18:53,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:18:53,325 INFO L93 Difference]: Finished difference Result 189 states and 193 transitions. [2024-11-09 07:18:53,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2024-11-09 07:18:53,326 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 3.169491525423729) internal successors, (187), 58 states have internal predecessors, (187), 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 109 [2024-11-09 07:18:53,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:18:53,327 INFO L225 Difference]: With dead ends: 189 [2024-11-09 07:18:53,327 INFO L226 Difference]: Without dead ends: 113 [2024-11-09 07:18:53,328 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 263 SyntacticMatches, 35 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2628 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=826, Invalid=3596, Unknown=0, NotChecked=0, Total=4422 [2024-11-09 07:18:53,329 INFO L432 NwaCegarLoop]: 20 mSDtfsCounter, 1 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 595 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 198 SdHoareTripleChecker+Invalid, 596 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 595 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-09 07:18:53,329 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 198 Invalid, 596 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 595 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-09 07:18:53,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2024-11-09 07:18:53,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2024-11-09 07:18:53,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 112 states have (on average 1.0267857142857142) internal successors, (115), 112 states have internal predecessors, (115), 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) [2024-11-09 07:18:53,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 115 transitions. [2024-11-09 07:18:53,338 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 115 transitions. Word has length 109 [2024-11-09 07:18:53,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:18:53,338 INFO L471 AbstractCegarLoop]: Abstraction has 113 states and 115 transitions. [2024-11-09 07:18:53,338 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 3.169491525423729) internal successors, (187), 58 states have internal predecessors, (187), 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) [2024-11-09 07:18:53,338 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 115 transitions. [2024-11-09 07:18:53,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2024-11-09 07:18:53,339 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:18:53,339 INFO L215 NwaCegarLoop]: trace histogram [18, 18, 18, 18, 17, 17, 1, 1, 1, 1, 1] [2024-11-09 07:18:53,358 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2024-11-09 07:18:53,539 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2024-11-09 07:18:53,540 INFO L396 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:18:53,540 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:18:53,540 INFO L85 PathProgramCache]: Analyzing trace with hash 1555225651, now seen corresponding path program 34 times [2024-11-09 07:18:53,540 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:18:53,541 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1795901201] [2024-11-09 07:18:53,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:18:53,541 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:18:53,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:18:54,512 INFO L134 CoverageAnalysis]: Checked inductivity of 919 backedges. 289 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:54,512 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:18:54,512 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1795901201] [2024-11-09 07:18:54,513 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1795901201] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:18:54,513 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1426975890] [2024-11-09 07:18:54,513 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:18:54,514 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:18:54,514 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:18:54,516 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:18:54,519 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2024-11-09 07:18:54,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:18:54,741 INFO L255 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 39 conjuncts are in the unsatisfiable core [2024-11-09 07:18:54,747 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:18:55,070 INFO L134 CoverageAnalysis]: Checked inductivity of 919 backedges. 324 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:55,071 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:18:55,837 INFO L134 CoverageAnalysis]: Checked inductivity of 919 backedges. 324 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:55,837 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1426975890] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:18:55,837 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2023670593] [2024-11-09 07:18:55,839 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:18:55,839 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:18:55,839 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:18:55,840 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:18:55,840 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:18:56,010 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:18:56,569 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20829#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:18:56,569 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:18:56,569 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:18:56,570 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 23 [2024-11-09 07:18:56,570 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1793940654] [2024-11-09 07:18:56,570 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:18:56,571 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2024-11-09 07:18:56,571 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:18:56,571 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2024-11-09 07:18:56,572 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=746, Unknown=0, NotChecked=0, Total=992 [2024-11-09 07:18:56,572 INFO L87 Difference]: Start difference. First operand 113 states and 115 transitions. Second operand has 24 states, 24 states have (on average 4.833333333333333) internal successors, (116), 23 states have internal predecessors, (116), 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) [2024-11-09 07:18:57,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:18:57,143 INFO L93 Difference]: Finished difference Result 126 states and 128 transitions. [2024-11-09 07:18:57,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2024-11-09 07:18:57,144 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 4.833333333333333) internal successors, (116), 23 states have internal predecessors, (116), 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 111 [2024-11-09 07:18:57,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:18:57,145 INFO L225 Difference]: With dead ends: 126 [2024-11-09 07:18:57,145 INFO L226 Difference]: Without dead ends: 124 [2024-11-09 07:18:57,146 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 387 GetRequests, 302 SyntacticMatches, 37 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1006 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=660, Invalid=1790, Unknown=0, NotChecked=0, Total=2450 [2024-11-09 07:18:57,147 INFO L432 NwaCegarLoop]: 25 mSDtfsCounter, 12 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 190 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 191 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 07:18:57,147 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 174 Invalid, 191 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 190 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 07:18:57,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2024-11-09 07:18:57,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 117. [2024-11-09 07:18:57,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.0258620689655173) internal successors, (119), 116 states have internal predecessors, (119), 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) [2024-11-09 07:18:57,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 119 transitions. [2024-11-09 07:18:57,157 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 119 transitions. Word has length 111 [2024-11-09 07:18:57,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:18:57,158 INFO L471 AbstractCegarLoop]: Abstraction has 117 states and 119 transitions. [2024-11-09 07:18:57,158 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 4.833333333333333) internal successors, (116), 23 states have internal predecessors, (116), 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) [2024-11-09 07:18:57,159 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 119 transitions. [2024-11-09 07:18:57,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2024-11-09 07:18:57,160 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:18:57,160 INFO L215 NwaCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1] [2024-11-09 07:18:57,191 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2024-11-09 07:18:57,364 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2024-11-09 07:18:57,365 INFO L396 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:18:57,366 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:18:57,366 INFO L85 PathProgramCache]: Analyzing trace with hash -610708645, now seen corresponding path program 35 times [2024-11-09 07:18:57,366 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:18:57,366 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [824258094] [2024-11-09 07:18:57,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:18:57,367 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:18:57,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:18:58,944 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 597 proven. 393 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:18:58,945 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:18:58,945 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [824258094] [2024-11-09 07:18:58,945 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [824258094] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:18:58,945 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [277394538] [2024-11-09 07:18:58,945 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:18:58,945 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:18:58,946 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:18:58,948 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:18:58,950 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2024-11-09 07:18:59,156 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2024-11-09 07:18:59,156 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:18:59,160 INFO L255 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 40 conjuncts are in the unsatisfiable core [2024-11-09 07:18:59,164 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:19:00,532 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 666 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:00,532 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:19:01,527 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 666 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:01,527 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [277394538] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:19:01,527 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1789314096] [2024-11-09 07:19:01,529 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:19:01,529 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:19:01,529 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:19:01,530 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:19:01,530 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:19:01,732 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:19:02,596 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21939#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:19:02,596 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:19:02,596 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:19:02,597 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 61 [2024-11-09 07:19:02,597 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355539963] [2024-11-09 07:19:02,597 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:19:02,598 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2024-11-09 07:19:02,598 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:19:02,599 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2024-11-09 07:19:02,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=908, Invalid=3922, Unknown=0, NotChecked=0, Total=4830 [2024-11-09 07:19:02,601 INFO L87 Difference]: Start difference. First operand 117 states and 119 transitions. Second operand has 62 states, 62 states have (on average 3.225806451612903) internal successors, (200), 61 states have internal predecessors, (200), 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) [2024-11-09 07:19:03,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:19:03,066 INFO L93 Difference]: Finished difference Result 199 states and 203 transitions. [2024-11-09 07:19:03,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2024-11-09 07:19:03,067 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 3.225806451612903) internal successors, (200), 61 states have internal predecessors, (200), 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 115 [2024-11-09 07:19:03,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:19:03,068 INFO L225 Difference]: With dead ends: 199 [2024-11-09 07:19:03,068 INFO L226 Difference]: Without dead ends: 119 [2024-11-09 07:19:03,068 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 278 SyntacticMatches, 37 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2888 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=908, Invalid=3922, Unknown=0, NotChecked=0, Total=4830 [2024-11-09 07:19:03,069 INFO L432 NwaCegarLoop]: 21 mSDtfsCounter, 1 mSDsluCounter, 159 mSDsCounter, 0 mSdLazyCounter, 545 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 546 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 545 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-09 07:19:03,069 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 180 Invalid, 546 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 545 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-09 07:19:03,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2024-11-09 07:19:03,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2024-11-09 07:19:03,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 118 states have (on average 1.0254237288135593) internal successors, (121), 118 states have internal predecessors, (121), 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) [2024-11-09 07:19:03,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2024-11-09 07:19:03,078 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 115 [2024-11-09 07:19:03,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:19:03,079 INFO L471 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2024-11-09 07:19:03,079 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 3.225806451612903) internal successors, (200), 61 states have internal predecessors, (200), 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) [2024-11-09 07:19:03,079 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2024-11-09 07:19:03,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2024-11-09 07:19:03,080 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:19:03,080 INFO L215 NwaCegarLoop]: trace histogram [19, 19, 19, 19, 18, 18, 1, 1, 1, 1, 1] [2024-11-09 07:19:03,099 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2024-11-09 07:19:03,281 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2024-11-09 07:19:03,282 INFO L396 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:19:03,282 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:19:03,282 INFO L85 PathProgramCache]: Analyzing trace with hash -26599712, now seen corresponding path program 36 times [2024-11-09 07:19:03,282 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:19:03,282 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1414983212] [2024-11-09 07:19:03,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:19:03,283 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:19:03,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:19:04,169 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 324 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:04,169 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:19:04,170 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1414983212] [2024-11-09 07:19:04,170 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1414983212] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:19:04,170 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [434328105] [2024-11-09 07:19:04,170 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:19:04,171 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:19:04,171 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:19:04,173 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:19:04,175 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2024-11-09 07:19:04,375 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:19:04,375 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:19:04,380 INFO L255 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 44 conjuncts are in the unsatisfiable core [2024-11-09 07:19:04,384 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:19:04,683 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 361 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:04,683 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:19:05,481 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 361 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:05,482 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [434328105] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:19:05,482 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1867839687] [2024-11-09 07:19:05,483 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:19:05,483 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:19:05,484 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:19:05,484 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:19:05,484 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:19:05,653 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:19:06,147 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23084#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:19:06,147 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:19:06,147 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:19:06,148 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 24 [2024-11-09 07:19:06,148 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940660494] [2024-11-09 07:19:06,148 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:19:06,148 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2024-11-09 07:19:06,148 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:19:06,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2024-11-09 07:19:06,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=267, Invalid=789, Unknown=0, NotChecked=0, Total=1056 [2024-11-09 07:19:06,149 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand has 25 states, 25 states have (on average 4.88) internal successors, (122), 24 states have internal predecessors, (122), 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) [2024-11-09 07:19:06,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:19:06,634 INFO L93 Difference]: Finished difference Result 132 states and 134 transitions. [2024-11-09 07:19:06,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2024-11-09 07:19:06,634 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 4.88) internal successors, (122), 24 states have internal predecessors, (122), 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 117 [2024-11-09 07:19:06,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:19:06,635 INFO L225 Difference]: With dead ends: 132 [2024-11-09 07:19:06,635 INFO L226 Difference]: Without dead ends: 130 [2024-11-09 07:19:06,636 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 320 SyntacticMatches, 38 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1080 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=723, Invalid=1929, Unknown=0, NotChecked=0, Total=2652 [2024-11-09 07:19:06,637 INFO L432 NwaCegarLoop]: 26 mSDtfsCounter, 13 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:19:06,637 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 186 Invalid, 207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 206 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:19:06,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2024-11-09 07:19:06,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 123. [2024-11-09 07:19:06,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.0245901639344261) internal successors, (125), 122 states have internal predecessors, (125), 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) [2024-11-09 07:19:06,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 125 transitions. [2024-11-09 07:19:06,648 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 125 transitions. Word has length 117 [2024-11-09 07:19:06,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:19:06,649 INFO L471 AbstractCegarLoop]: Abstraction has 123 states and 125 transitions. [2024-11-09 07:19:06,649 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 4.88) internal successors, (122), 24 states have internal predecessors, (122), 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) [2024-11-09 07:19:06,649 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 125 transitions. [2024-11-09 07:19:06,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2024-11-09 07:19:06,650 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:19:06,651 INFO L215 NwaCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1] [2024-11-09 07:19:06,677 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2024-11-09 07:19:06,854 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2024-11-09 07:19:06,855 INFO L396 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:19:06,855 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:19:06,855 INFO L85 PathProgramCache]: Analyzing trace with hash 1969584008, now seen corresponding path program 37 times [2024-11-09 07:19:06,855 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:19:06,855 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [887053365] [2024-11-09 07:19:06,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:19:06,856 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:19:06,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:19:08,070 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 668 proven. 434 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:08,070 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:19:08,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [887053365] [2024-11-09 07:19:08,070 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [887053365] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:19:08,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1932807643] [2024-11-09 07:19:08,071 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:19:08,071 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:19:08,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:19:08,073 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:19:08,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2024-11-09 07:19:08,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:19:08,244 INFO L255 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 42 conjuncts are in the unsatisfiable core [2024-11-09 07:19:08,246 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:19:09,556 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 741 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:09,556 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:19:10,573 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 741 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:10,574 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1932807643] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:19:10,574 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [506994681] [2024-11-09 07:19:10,575 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:19:10,575 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:19:10,575 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:19:10,576 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:19:10,576 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:19:10,732 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:19:11,554 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24251#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:19:11,554 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:19:11,555 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:19:11,555 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 64 [2024-11-09 07:19:11,555 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [970702025] [2024-11-09 07:19:11,555 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:19:11,556 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2024-11-09 07:19:11,556 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:19:11,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2024-11-09 07:19:11,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=994, Invalid=4262, Unknown=0, NotChecked=0, Total=5256 [2024-11-09 07:19:11,557 INFO L87 Difference]: Start difference. First operand 123 states and 125 transitions. Second operand has 65 states, 65 states have (on average 3.1846153846153844) internal successors, (207), 64 states have internal predecessors, (207), 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) [2024-11-09 07:19:12,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:19:12,045 INFO L93 Difference]: Finished difference Result 209 states and 213 transitions. [2024-11-09 07:19:12,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2024-11-09 07:19:12,046 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 3.1846153846153844) internal successors, (207), 64 states have internal predecessors, (207), 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 121 [2024-11-09 07:19:12,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:19:12,047 INFO L225 Difference]: With dead ends: 209 [2024-11-09 07:19:12,048 INFO L226 Difference]: Without dead ends: 125 [2024-11-09 07:19:12,048 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 293 SyntacticMatches, 39 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3160 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=994, Invalid=4262, Unknown=0, NotChecked=0, Total=5256 [2024-11-09 07:19:12,049 INFO L432 NwaCegarLoop]: 22 mSDtfsCounter, 1 mSDsluCounter, 214 mSDsCounter, 0 mSdLazyCounter, 702 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 236 SdHoareTripleChecker+Invalid, 703 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 702 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-09 07:19:12,050 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 236 Invalid, 703 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 702 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-09 07:19:12,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2024-11-09 07:19:12,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2024-11-09 07:19:12,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 124 states have (on average 1.0241935483870968) internal successors, (127), 124 states have internal predecessors, (127), 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) [2024-11-09 07:19:12,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 127 transitions. [2024-11-09 07:19:12,061 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 127 transitions. Word has length 121 [2024-11-09 07:19:12,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:19:12,062 INFO L471 AbstractCegarLoop]: Abstraction has 125 states and 127 transitions. [2024-11-09 07:19:12,062 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 3.1846153846153844) internal successors, (207), 64 states have internal predecessors, (207), 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) [2024-11-09 07:19:12,062 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 127 transitions. [2024-11-09 07:19:12,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2024-11-09 07:19:12,063 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:19:12,063 INFO L215 NwaCegarLoop]: trace histogram [20, 20, 20, 20, 19, 19, 1, 1, 1, 1, 1] [2024-11-09 07:19:12,092 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2024-11-09 07:19:12,264 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2024-11-09 07:19:12,264 INFO L396 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:19:12,265 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:19:12,265 INFO L85 PathProgramCache]: Analyzing trace with hash 1221512013, now seen corresponding path program 38 times [2024-11-09 07:19:12,265 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:19:12,265 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723084363] [2024-11-09 07:19:12,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:19:12,265 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:19:12,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:19:13,123 INFO L134 CoverageAnalysis]: Checked inductivity of 1141 backedges. 361 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:13,124 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:19:13,124 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723084363] [2024-11-09 07:19:13,124 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [723084363] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:19:13,124 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1333205854] [2024-11-09 07:19:13,124 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:19:13,124 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:19:13,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:19:13,125 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:19:13,127 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2024-11-09 07:19:13,283 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2024-11-09 07:19:13,283 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:19:13,286 INFO L255 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 46 conjuncts are in the unsatisfiable core [2024-11-09 07:19:13,288 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:19:13,491 INFO L134 CoverageAnalysis]: Checked inductivity of 1141 backedges. 400 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:13,491 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:19:14,170 INFO L134 CoverageAnalysis]: Checked inductivity of 1141 backedges. 400 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:14,171 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1333205854] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:19:14,171 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1399662284] [2024-11-09 07:19:14,172 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:19:14,172 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:19:14,172 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:19:14,173 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:19:14,173 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:19:14,356 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:19:14,990 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25454#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:19:14,990 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:19:14,990 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:19:14,991 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 25 [2024-11-09 07:19:14,991 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589104190] [2024-11-09 07:19:14,991 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:19:14,992 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2024-11-09 07:19:14,992 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:19:14,992 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2024-11-09 07:19:14,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=289, Invalid=833, Unknown=0, NotChecked=0, Total=1122 [2024-11-09 07:19:14,993 INFO L87 Difference]: Start difference. First operand 125 states and 127 transitions. Second operand has 26 states, 26 states have (on average 4.923076923076923) internal successors, (128), 25 states have internal predecessors, (128), 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) [2024-11-09 07:19:15,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:19:15,494 INFO L93 Difference]: Finished difference Result 138 states and 140 transitions. [2024-11-09 07:19:15,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2024-11-09 07:19:15,495 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 4.923076923076923) internal successors, (128), 25 states have internal predecessors, (128), 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 123 [2024-11-09 07:19:15,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:19:15,496 INFO L225 Difference]: With dead ends: 138 [2024-11-09 07:19:15,496 INFO L226 Difference]: Without dead ends: 136 [2024-11-09 07:19:15,497 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 429 GetRequests, 337 SyntacticMatches, 40 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1176 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=789, Invalid=2073, Unknown=0, NotChecked=0, Total=2862 [2024-11-09 07:19:15,497 INFO L432 NwaCegarLoop]: 27 mSDtfsCounter, 14 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 190 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:19:15,497 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 167 Invalid, 190 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:19:15,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2024-11-09 07:19:15,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 129. [2024-11-09 07:19:15,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 128 states have (on average 1.0234375) internal successors, (131), 128 states have internal predecessors, (131), 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) [2024-11-09 07:19:15,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 131 transitions. [2024-11-09 07:19:15,508 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 131 transitions. Word has length 123 [2024-11-09 07:19:15,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:19:15,509 INFO L471 AbstractCegarLoop]: Abstraction has 129 states and 131 transitions. [2024-11-09 07:19:15,509 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 4.923076923076923) internal successors, (128), 25 states have internal predecessors, (128), 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) [2024-11-09 07:19:15,509 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 131 transitions. [2024-11-09 07:19:15,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2024-11-09 07:19:15,510 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:19:15,510 INFO L215 NwaCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1] [2024-11-09 07:19:15,538 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2024-11-09 07:19:15,711 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2024-11-09 07:19:15,712 INFO L396 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:19:15,712 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:19:15,712 INFO L85 PathProgramCache]: Analyzing trace with hash 1804871029, now seen corresponding path program 39 times [2024-11-09 07:19:15,712 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:19:15,712 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928355992] [2024-11-09 07:19:15,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:19:15,713 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:19:15,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:19:17,084 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 743 proven. 477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:17,084 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:19:17,084 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928355992] [2024-11-09 07:19:17,085 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [928355992] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:19:17,085 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [915488521] [2024-11-09 07:19:17,085 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:19:17,085 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:19:17,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:19:17,086 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:19:17,087 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2024-11-09 07:19:17,266 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:19:17,266 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:19:17,269 INFO L255 TraceCheckSpWp]: Trace formula consists of 375 conjuncts, 44 conjuncts are in the unsatisfiable core [2024-11-09 07:19:17,271 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:19:18,652 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 820 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:18,653 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:19:19,674 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 820 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:19,675 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [915488521] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:19:19,675 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [687322151] [2024-11-09 07:19:19,676 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:19:19,676 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:19:19,676 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:19:19,676 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:19:19,676 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:19:19,870 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:19:20,682 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26678#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:19:20,682 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:19:20,682 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:19:20,682 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 67 [2024-11-09 07:19:20,683 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796619268] [2024-11-09 07:19:20,683 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:19:20,683 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2024-11-09 07:19:20,683 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:19:20,684 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2024-11-09 07:19:20,684 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1084, Invalid=4616, Unknown=0, NotChecked=0, Total=5700 [2024-11-09 07:19:20,685 INFO L87 Difference]: Start difference. First operand 129 states and 131 transitions. Second operand has 68 states, 68 states have (on average 3.1911764705882355) internal successors, (217), 67 states have internal predecessors, (217), 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) [2024-11-09 07:19:21,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:19:21,168 INFO L93 Difference]: Finished difference Result 219 states and 223 transitions. [2024-11-09 07:19:21,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2024-11-09 07:19:21,169 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 3.1911764705882355) internal successors, (217), 67 states have internal predecessors, (217), 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 127 [2024-11-09 07:19:21,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:19:21,170 INFO L225 Difference]: With dead ends: 219 [2024-11-09 07:19:21,170 INFO L226 Difference]: Without dead ends: 131 [2024-11-09 07:19:21,171 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 308 SyntacticMatches, 41 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3444 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=1084, Invalid=4616, Unknown=0, NotChecked=0, Total=5700 [2024-11-09 07:19:21,171 INFO L432 NwaCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 668 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 669 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 668 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-09 07:19:21,172 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 222 Invalid, 669 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 668 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-09 07:19:21,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2024-11-09 07:19:21,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 131. [2024-11-09 07:19:21,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.023076923076923) internal successors, (133), 130 states have internal predecessors, (133), 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) [2024-11-09 07:19:21,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 133 transitions. [2024-11-09 07:19:21,184 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 133 transitions. Word has length 127 [2024-11-09 07:19:21,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:19:21,184 INFO L471 AbstractCegarLoop]: Abstraction has 131 states and 133 transitions. [2024-11-09 07:19:21,185 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 3.1911764705882355) internal successors, (217), 67 states have internal predecessors, (217), 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) [2024-11-09 07:19:21,185 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 133 transitions. [2024-11-09 07:19:21,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2024-11-09 07:19:21,186 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:19:21,186 INFO L215 NwaCegarLoop]: trace histogram [21, 21, 21, 21, 20, 20, 1, 1, 1, 1, 1] [2024-11-09 07:19:21,210 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2024-11-09 07:19:21,386 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:19:21,387 INFO L396 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:19:21,387 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:19:21,387 INFO L85 PathProgramCache]: Analyzing trace with hash -1499541126, now seen corresponding path program 40 times [2024-11-09 07:19:21,387 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:19:21,388 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1738634459] [2024-11-09 07:19:21,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:19:21,388 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:19:21,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:19:22,360 INFO L134 CoverageAnalysis]: Checked inductivity of 1261 backedges. 400 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:22,360 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:19:22,360 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1738634459] [2024-11-09 07:19:22,360 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1738634459] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:19:22,360 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2004350943] [2024-11-09 07:19:22,361 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:19:22,361 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:19:22,361 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:19:22,364 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:19:22,366 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2024-11-09 07:19:22,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:19:22,557 INFO L255 TraceCheckSpWp]: Trace formula consists of 381 conjuncts, 45 conjuncts are in the unsatisfiable core [2024-11-09 07:19:22,561 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:19:22,778 INFO L134 CoverageAnalysis]: Checked inductivity of 1261 backedges. 441 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:22,778 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:19:23,678 INFO L134 CoverageAnalysis]: Checked inductivity of 1261 backedges. 441 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:23,679 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2004350943] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:19:23,679 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [337232947] [2024-11-09 07:19:23,680 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:19:23,680 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:19:23,680 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:19:23,680 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:19:23,681 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:19:23,846 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:19:24,354 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27939#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:19:24,354 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:19:24,355 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:19:24,355 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 26 [2024-11-09 07:19:24,355 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109544925] [2024-11-09 07:19:24,355 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:19:24,356 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2024-11-09 07:19:24,356 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:19:24,356 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2024-11-09 07:19:24,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=312, Invalid=878, Unknown=0, NotChecked=0, Total=1190 [2024-11-09 07:19:24,357 INFO L87 Difference]: Start difference. First operand 131 states and 133 transitions. Second operand has 27 states, 27 states have (on average 4.962962962962963) internal successors, (134), 26 states have internal predecessors, (134), 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) [2024-11-09 07:19:24,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:19:24,882 INFO L93 Difference]: Finished difference Result 144 states and 146 transitions. [2024-11-09 07:19:24,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2024-11-09 07:19:24,883 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 4.962962962962963) internal successors, (134), 26 states have internal predecessors, (134), 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 129 [2024-11-09 07:19:24,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:19:24,884 INFO L225 Difference]: With dead ends: 144 [2024-11-09 07:19:24,884 INFO L226 Difference]: Without dead ends: 142 [2024-11-09 07:19:24,885 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 450 GetRequests, 353 SyntacticMatches, 43 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1297 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=858, Invalid=2222, Unknown=0, NotChecked=0, Total=3080 [2024-11-09 07:19:24,885 INFO L432 NwaCegarLoop]: 28 mSDtfsCounter, 14 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 190 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 07:19:24,886 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 159 Invalid, 190 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 07:19:24,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2024-11-09 07:19:24,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 135. [2024-11-09 07:19:24,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 134 states have (on average 1.0223880597014925) internal successors, (137), 134 states have internal predecessors, (137), 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) [2024-11-09 07:19:24,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 137 transitions. [2024-11-09 07:19:24,897 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 137 transitions. Word has length 129 [2024-11-09 07:19:24,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:19:24,897 INFO L471 AbstractCegarLoop]: Abstraction has 135 states and 137 transitions. [2024-11-09 07:19:24,898 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 4.962962962962963) internal successors, (134), 26 states have internal predecessors, (134), 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) [2024-11-09 07:19:24,898 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 137 transitions. [2024-11-09 07:19:24,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2024-11-09 07:19:24,899 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:19:24,899 INFO L215 NwaCegarLoop]: trace histogram [22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1] [2024-11-09 07:19:24,919 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2024-11-09 07:19:25,103 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:19:25,104 INFO L396 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:19:25,104 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:19:25,104 INFO L85 PathProgramCache]: Analyzing trace with hash -1200927454, now seen corresponding path program 41 times [2024-11-09 07:19:25,104 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:19:25,105 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1376148497] [2024-11-09 07:19:25,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:19:25,105 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:19:25,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:19:26,397 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 822 proven. 522 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:26,398 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:19:26,398 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1376148497] [2024-11-09 07:19:26,398 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1376148497] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:19:26,398 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [390322536] [2024-11-09 07:19:26,398 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:19:26,398 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:19:26,399 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:19:26,400 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:19:26,401 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2024-11-09 07:19:26,608 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2024-11-09 07:19:26,608 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:19:26,611 INFO L255 TraceCheckSpWp]: Trace formula consists of 392 conjuncts, 46 conjuncts are in the unsatisfiable core [2024-11-09 07:19:26,613 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:19:28,041 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 903 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:28,042 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:19:29,157 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 903 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:29,157 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [390322536] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:19:29,158 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1137477302] [2024-11-09 07:19:29,159 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:19:29,159 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:19:29,159 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:19:29,159 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:19:29,159 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:19:29,350 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:19:30,291 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29220#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:19:30,291 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:19:30,292 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:19:30,292 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 70 [2024-11-09 07:19:30,292 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448144459] [2024-11-09 07:19:30,292 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:19:30,293 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2024-11-09 07:19:30,293 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:19:30,295 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2024-11-09 07:19:30,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1178, Invalid=4984, Unknown=0, NotChecked=0, Total=6162 [2024-11-09 07:19:30,296 INFO L87 Difference]: Start difference. First operand 135 states and 137 transitions. Second operand has 71 states, 71 states have (on average 3.1971830985915495) internal successors, (227), 70 states have internal predecessors, (227), 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) [2024-11-09 07:19:30,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:19:30,922 INFO L93 Difference]: Finished difference Result 229 states and 233 transitions. [2024-11-09 07:19:30,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2024-11-09 07:19:30,922 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 3.1971830985915495) internal successors, (227), 70 states have internal predecessors, (227), 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 133 [2024-11-09 07:19:30,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:19:30,923 INFO L225 Difference]: With dead ends: 229 [2024-11-09 07:19:30,924 INFO L226 Difference]: Without dead ends: 137 [2024-11-09 07:19:30,924 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 443 GetRequests, 323 SyntacticMatches, 43 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3740 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=1178, Invalid=4984, Unknown=0, NotChecked=0, Total=6162 [2024-11-09 07:19:30,925 INFO L432 NwaCegarLoop]: 24 mSDtfsCounter, 1 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 751 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 249 SdHoareTripleChecker+Invalid, 752 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 751 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-11-09 07:19:30,925 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 249 Invalid, 752 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 751 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-11-09 07:19:30,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2024-11-09 07:19:30,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 137. [2024-11-09 07:19:30,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 136 states have (on average 1.0220588235294117) internal successors, (139), 136 states have internal predecessors, (139), 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) [2024-11-09 07:19:30,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 139 transitions. [2024-11-09 07:19:30,940 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 139 transitions. Word has length 133 [2024-11-09 07:19:30,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:19:30,940 INFO L471 AbstractCegarLoop]: Abstraction has 137 states and 139 transitions. [2024-11-09 07:19:30,941 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 3.1971830985915495) internal successors, (227), 70 states have internal predecessors, (227), 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) [2024-11-09 07:19:30,941 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 139 transitions. [2024-11-09 07:19:30,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2024-11-09 07:19:30,942 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:19:30,942 INFO L215 NwaCegarLoop]: trace histogram [22, 22, 22, 22, 21, 21, 1, 1, 1, 1, 1] [2024-11-09 07:19:30,976 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2024-11-09 07:19:31,143 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:19:31,144 INFO L396 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:19:31,144 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:19:31,144 INFO L85 PathProgramCache]: Analyzing trace with hash -1136385689, now seen corresponding path program 42 times [2024-11-09 07:19:31,144 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:19:31,144 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [553422714] [2024-11-09 07:19:31,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:19:31,145 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:19:31,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:19:32,094 INFO L134 CoverageAnalysis]: Checked inductivity of 1387 backedges. 441 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:32,095 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:19:32,095 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [553422714] [2024-11-09 07:19:32,095 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [553422714] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:19:32,095 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1611062041] [2024-11-09 07:19:32,096 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:19:32,096 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:19:32,096 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:19:32,098 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:19:32,099 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2024-11-09 07:19:32,263 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:19:32,263 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:19:32,266 INFO L255 TraceCheckSpWp]: Trace formula consists of 398 conjuncts, 50 conjuncts are in the unsatisfiable core [2024-11-09 07:19:32,269 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:19:32,550 INFO L134 CoverageAnalysis]: Checked inductivity of 1387 backedges. 484 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:32,551 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:19:33,410 INFO L134 CoverageAnalysis]: Checked inductivity of 1387 backedges. 484 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:33,410 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1611062041] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:19:33,410 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [18097642] [2024-11-09 07:19:33,412 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:19:33,412 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:19:33,412 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:19:33,412 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:19:33,413 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:19:33,624 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:19:34,276 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30539#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:19:34,276 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:19:34,276 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:19:34,276 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 27 [2024-11-09 07:19:34,277 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260116904] [2024-11-09 07:19:34,277 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:19:34,277 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2024-11-09 07:19:34,278 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:19:34,278 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2024-11-09 07:19:34,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=336, Invalid=924, Unknown=0, NotChecked=0, Total=1260 [2024-11-09 07:19:34,279 INFO L87 Difference]: Start difference. First operand 137 states and 139 transitions. Second operand has 28 states, 28 states have (on average 5.0) internal successors, (140), 27 states have internal predecessors, (140), 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) [2024-11-09 07:19:34,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:19:34,934 INFO L93 Difference]: Finished difference Result 150 states and 152 transitions. [2024-11-09 07:19:34,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2024-11-09 07:19:34,934 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 5.0) internal successors, (140), 27 states have internal predecessors, (140), 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 135 [2024-11-09 07:19:34,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:19:34,935 INFO L225 Difference]: With dead ends: 150 [2024-11-09 07:19:34,935 INFO L226 Difference]: Without dead ends: 148 [2024-11-09 07:19:34,936 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 371 SyntacticMatches, 44 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1380 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=930, Invalid=2376, Unknown=0, NotChecked=0, Total=3306 [2024-11-09 07:19:34,936 INFO L432 NwaCegarLoop]: 29 mSDtfsCounter, 13 mSDsluCounter, 191 mSDsCounter, 0 mSdLazyCounter, 246 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 246 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 07:19:34,937 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 220 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 246 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 07:19:34,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2024-11-09 07:19:34,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 141. [2024-11-09 07:19:34,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 140 states have (on average 1.0214285714285714) internal successors, (143), 140 states have internal predecessors, (143), 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) [2024-11-09 07:19:34,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 143 transitions. [2024-11-09 07:19:34,949 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 143 transitions. Word has length 135 [2024-11-09 07:19:34,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:19:34,950 INFO L471 AbstractCegarLoop]: Abstraction has 141 states and 143 transitions. [2024-11-09 07:19:34,950 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 5.0) internal successors, (140), 27 states have internal predecessors, (140), 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) [2024-11-09 07:19:34,950 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 143 transitions. [2024-11-09 07:19:34,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2024-11-09 07:19:34,951 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:19:34,951 INFO L215 NwaCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1] [2024-11-09 07:19:34,979 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2024-11-09 07:19:35,152 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:19:35,153 INFO L396 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:19:35,154 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:19:35,154 INFO L85 PathProgramCache]: Analyzing trace with hash -639836529, now seen corresponding path program 43 times [2024-11-09 07:19:35,154 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:19:35,155 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2075482115] [2024-11-09 07:19:35,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:19:35,155 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:19:35,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:19:36,795 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 905 proven. 569 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:36,795 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:19:36,795 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2075482115] [2024-11-09 07:19:36,795 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2075482115] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:19:36,795 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2034694327] [2024-11-09 07:19:36,795 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:19:36,796 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:19:36,796 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:19:36,797 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:19:36,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2024-11-09 07:19:37,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:19:37,009 INFO L255 TraceCheckSpWp]: Trace formula consists of 409 conjuncts, 48 conjuncts are in the unsatisfiable core [2024-11-09 07:19:37,012 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:19:38,851 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 990 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:38,851 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:19:40,394 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 990 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:40,395 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2034694327] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:19:40,395 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1185073516] [2024-11-09 07:19:40,396 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:19:40,397 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:19:40,397 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:19:40,397 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:19:40,398 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:19:40,688 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:19:41,661 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31877#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:19:41,662 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:19:41,662 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:19:41,662 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 73 [2024-11-09 07:19:41,662 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [931131827] [2024-11-09 07:19:41,662 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:19:41,663 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2024-11-09 07:19:41,663 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:19:41,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2024-11-09 07:19:41,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1276, Invalid=5366, Unknown=0, NotChecked=0, Total=6642 [2024-11-09 07:19:41,664 INFO L87 Difference]: Start difference. First operand 141 states and 143 transitions. Second operand has 74 states, 74 states have (on average 3.2027027027027026) internal successors, (237), 73 states have internal predecessors, (237), 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) [2024-11-09 07:19:42,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:19:42,265 INFO L93 Difference]: Finished difference Result 239 states and 243 transitions. [2024-11-09 07:19:42,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2024-11-09 07:19:42,267 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 3.2027027027027026) internal successors, (237), 73 states have internal predecessors, (237), 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 139 [2024-11-09 07:19:42,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:19:42,268 INFO L225 Difference]: With dead ends: 239 [2024-11-09 07:19:42,268 INFO L226 Difference]: Without dead ends: 143 [2024-11-09 07:19:42,269 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 463 GetRequests, 338 SyntacticMatches, 45 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4048 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=1276, Invalid=5366, Unknown=0, NotChecked=0, Total=6642 [2024-11-09 07:19:42,270 INFO L432 NwaCegarLoop]: 25 mSDtfsCounter, 1 mSDsluCounter, 250 mSDsCounter, 0 mSdLazyCounter, 837 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 275 SdHoareTripleChecker+Invalid, 838 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 837 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-11-09 07:19:42,270 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 275 Invalid, 838 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 837 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-11-09 07:19:42,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2024-11-09 07:19:42,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 143. [2024-11-09 07:19:42,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.0211267605633803) internal successors, (145), 142 states have internal predecessors, (145), 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) [2024-11-09 07:19:42,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2024-11-09 07:19:42,284 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 139 [2024-11-09 07:19:42,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:19:42,284 INFO L471 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2024-11-09 07:19:42,285 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 3.2027027027027026) internal successors, (237), 73 states have internal predecessors, (237), 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) [2024-11-09 07:19:42,285 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2024-11-09 07:19:42,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2024-11-09 07:19:42,286 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:19:42,286 INFO L215 NwaCegarLoop]: trace histogram [23, 23, 23, 23, 22, 22, 1, 1, 1, 1, 1] [2024-11-09 07:19:42,315 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2024-11-09 07:19:42,487 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2024-11-09 07:19:42,487 INFO L396 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:19:42,487 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:19:42,487 INFO L85 PathProgramCache]: Analyzing trace with hash -2032882924, now seen corresponding path program 44 times [2024-11-09 07:19:42,487 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:19:42,488 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [337452729] [2024-11-09 07:19:42,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:19:42,488 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:19:42,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:19:43,685 INFO L134 CoverageAnalysis]: Checked inductivity of 1519 backedges. 484 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:43,685 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:19:43,686 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [337452729] [2024-11-09 07:19:43,686 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [337452729] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:19:43,686 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [990264043] [2024-11-09 07:19:43,686 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:19:43,686 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:19:43,686 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:19:43,688 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:19:43,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2024-11-09 07:19:43,921 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2024-11-09 07:19:43,921 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:19:43,925 INFO L255 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 52 conjuncts are in the unsatisfiable core [2024-11-09 07:19:43,927 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:19:44,190 INFO L134 CoverageAnalysis]: Checked inductivity of 1519 backedges. 529 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:44,190 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:19:45,155 INFO L134 CoverageAnalysis]: Checked inductivity of 1519 backedges. 529 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:45,156 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [990264043] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:19:45,156 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [524132335] [2024-11-09 07:19:45,156 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:19:45,157 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:19:45,157 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:19:45,157 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:19:45,157 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:19:45,373 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:19:45,919 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33254#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:19:45,919 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:19:45,919 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:19:45,919 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 28 [2024-11-09 07:19:45,919 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662807586] [2024-11-09 07:19:45,919 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:19:45,920 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2024-11-09 07:19:45,920 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:19:45,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2024-11-09 07:19:45,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=361, Invalid=971, Unknown=0, NotChecked=0, Total=1332 [2024-11-09 07:19:45,921 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand has 29 states, 29 states have (on average 5.0344827586206895) internal successors, (146), 28 states have internal predecessors, (146), 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) [2024-11-09 07:19:46,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:19:46,523 INFO L93 Difference]: Finished difference Result 156 states and 158 transitions. [2024-11-09 07:19:46,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2024-11-09 07:19:46,524 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 5.0344827586206895) internal successors, (146), 28 states have internal predecessors, (146), 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 141 [2024-11-09 07:19:46,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:19:46,525 INFO L225 Difference]: With dead ends: 156 [2024-11-09 07:19:46,525 INFO L226 Difference]: Without dead ends: 154 [2024-11-09 07:19:46,526 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 492 GetRequests, 388 SyntacticMatches, 46 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1488 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1005, Invalid=2535, Unknown=0, NotChecked=0, Total=3540 [2024-11-09 07:19:46,527 INFO L432 NwaCegarLoop]: 30 mSDtfsCounter, 14 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 207 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 07:19:46,527 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 177 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 207 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 07:19:46,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2024-11-09 07:19:46,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 147. [2024-11-09 07:19:46,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 146 states have (on average 1.0205479452054795) internal successors, (149), 146 states have internal predecessors, (149), 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) [2024-11-09 07:19:46,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 149 transitions. [2024-11-09 07:19:46,540 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 149 transitions. Word has length 141 [2024-11-09 07:19:46,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:19:46,541 INFO L471 AbstractCegarLoop]: Abstraction has 147 states and 149 transitions. [2024-11-09 07:19:46,541 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 5.0344827586206895) internal successors, (146), 28 states have internal predecessors, (146), 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) [2024-11-09 07:19:46,541 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 149 transitions. [2024-11-09 07:19:46,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2024-11-09 07:19:46,542 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:19:46,542 INFO L215 NwaCegarLoop]: trace histogram [24, 24, 23, 23, 23, 23, 1, 1, 1, 1, 1] [2024-11-09 07:19:46,570 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2024-11-09 07:19:46,743 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2024-11-09 07:19:46,744 INFO L396 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:19:46,744 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:19:46,744 INFO L85 PathProgramCache]: Analyzing trace with hash 1887881660, now seen corresponding path program 45 times [2024-11-09 07:19:46,745 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:19:46,745 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1963379970] [2024-11-09 07:19:46,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:19:46,745 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:19:46,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:19:48,562 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 992 proven. 618 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:48,563 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:19:48,563 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1963379970] [2024-11-09 07:19:48,563 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1963379970] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:19:48,563 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [411160120] [2024-11-09 07:19:48,563 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:19:48,563 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:19:48,564 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:19:48,566 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:19:48,569 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2024-11-09 07:19:48,778 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:19:48,778 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:19:48,782 INFO L255 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 50 conjuncts are in the unsatisfiable core [2024-11-09 07:19:48,784 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:19:50,508 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 1081 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:50,508 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:19:51,806 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 1081 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:51,806 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [411160120] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:19:51,806 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1617362274] [2024-11-09 07:19:51,807 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:19:51,807 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:19:51,807 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:19:51,808 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:19:51,808 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:19:51,976 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:19:52,844 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34649#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:19:52,844 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:19:52,844 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:19:52,845 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 76 [2024-11-09 07:19:52,845 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [151603809] [2024-11-09 07:19:52,845 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:19:52,845 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2024-11-09 07:19:52,845 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:19:52,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2024-11-09 07:19:52,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1378, Invalid=5762, Unknown=0, NotChecked=0, Total=7140 [2024-11-09 07:19:52,846 INFO L87 Difference]: Start difference. First operand 147 states and 149 transitions. Second operand has 77 states, 77 states have (on average 3.207792207792208) internal successors, (247), 76 states have internal predecessors, (247), 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) [2024-11-09 07:19:53,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:19:53,367 INFO L93 Difference]: Finished difference Result 249 states and 253 transitions. [2024-11-09 07:19:53,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2024-11-09 07:19:53,368 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 3.207792207792208) internal successors, (247), 76 states have internal predecessors, (247), 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 145 [2024-11-09 07:19:53,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:19:53,369 INFO L225 Difference]: With dead ends: 249 [2024-11-09 07:19:53,369 INFO L226 Difference]: Without dead ends: 149 [2024-11-09 07:19:53,370 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 483 GetRequests, 353 SyntacticMatches, 47 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4368 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=1378, Invalid=5762, Unknown=0, NotChecked=0, Total=7140 [2024-11-09 07:19:53,372 INFO L432 NwaCegarLoop]: 26 mSDtfsCounter, 1 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 744 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 245 SdHoareTripleChecker+Invalid, 745 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 744 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-09 07:19:53,372 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 245 Invalid, 745 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 744 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-09 07:19:53,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2024-11-09 07:19:53,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2024-11-09 07:19:53,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 148 states have (on average 1.0202702702702702) internal successors, (151), 148 states have internal predecessors, (151), 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) [2024-11-09 07:19:53,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 151 transitions. [2024-11-09 07:19:53,382 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 151 transitions. Word has length 145 [2024-11-09 07:19:53,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:19:53,383 INFO L471 AbstractCegarLoop]: Abstraction has 149 states and 151 transitions. [2024-11-09 07:19:53,383 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 3.207792207792208) internal successors, (247), 76 states have internal predecessors, (247), 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) [2024-11-09 07:19:53,383 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 151 transitions. [2024-11-09 07:19:53,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2024-11-09 07:19:53,384 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:19:53,384 INFO L215 NwaCegarLoop]: trace histogram [24, 24, 24, 24, 23, 23, 1, 1, 1, 1, 1] [2024-11-09 07:19:53,408 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2024-11-09 07:19:53,585 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2024-11-09 07:19:53,585 INFO L396 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:19:53,585 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:19:53,585 INFO L85 PathProgramCache]: Analyzing trace with hash 991059585, now seen corresponding path program 46 times [2024-11-09 07:19:53,586 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:19:53,586 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1332772079] [2024-11-09 07:19:53,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:19:53,586 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:19:53,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:19:54,586 INFO L134 CoverageAnalysis]: Checked inductivity of 1657 backedges. 529 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:54,587 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:19:54,587 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1332772079] [2024-11-09 07:19:54,587 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1332772079] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:19:54,588 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [975247953] [2024-11-09 07:19:54,588 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:19:54,588 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:19:54,588 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:19:54,590 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:19:54,592 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2024-11-09 07:19:54,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:19:54,809 INFO L255 TraceCheckSpWp]: Trace formula consists of 432 conjuncts, 51 conjuncts are in the unsatisfiable core [2024-11-09 07:19:54,812 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:19:55,080 INFO L134 CoverageAnalysis]: Checked inductivity of 1657 backedges. 576 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:55,080 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:19:56,031 INFO L134 CoverageAnalysis]: Checked inductivity of 1657 backedges. 576 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:56,031 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [975247953] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:19:56,031 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2087923552] [2024-11-09 07:19:56,032 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:19:56,032 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:19:56,033 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:19:56,033 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:19:56,033 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:19:56,180 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:19:56,753 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36084#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:19:56,753 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:19:56,753 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:19:56,753 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 29 [2024-11-09 07:19:56,753 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [941117770] [2024-11-09 07:19:56,754 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:19:56,754 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2024-11-09 07:19:56,754 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:19:56,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2024-11-09 07:19:56,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=387, Invalid=1019, Unknown=0, NotChecked=0, Total=1406 [2024-11-09 07:19:56,755 INFO L87 Difference]: Start difference. First operand 149 states and 151 transitions. Second operand has 30 states, 30 states have (on average 5.066666666666666) internal successors, (152), 29 states have internal predecessors, (152), 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) [2024-11-09 07:19:57,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:19:57,413 INFO L93 Difference]: Finished difference Result 162 states and 164 transitions. [2024-11-09 07:19:57,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2024-11-09 07:19:57,413 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 5.066666666666666) internal successors, (152), 29 states have internal predecessors, (152), 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 147 [2024-11-09 07:19:57,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:19:57,414 INFO L225 Difference]: With dead ends: 162 [2024-11-09 07:19:57,414 INFO L226 Difference]: Without dead ends: 160 [2024-11-09 07:19:57,415 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 513 GetRequests, 404 SyntacticMatches, 49 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1624 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1083, Invalid=2699, Unknown=0, NotChecked=0, Total=3782 [2024-11-09 07:19:57,416 INFO L432 NwaCegarLoop]: 31 mSDtfsCounter, 14 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 252 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 218 SdHoareTripleChecker+Invalid, 253 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 07:19:57,416 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 218 Invalid, 253 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 252 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 07:19:57,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2024-11-09 07:19:57,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 153. [2024-11-09 07:19:57,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.019736842105263) internal successors, (155), 152 states have internal predecessors, (155), 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) [2024-11-09 07:19:57,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 155 transitions. [2024-11-09 07:19:57,430 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 155 transitions. Word has length 147 [2024-11-09 07:19:57,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:19:57,431 INFO L471 AbstractCegarLoop]: Abstraction has 153 states and 155 transitions. [2024-11-09 07:19:57,431 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 5.066666666666666) internal successors, (152), 29 states have internal predecessors, (152), 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) [2024-11-09 07:19:57,431 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 155 transitions. [2024-11-09 07:19:57,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2024-11-09 07:19:57,432 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:19:57,432 INFO L215 NwaCegarLoop]: trace histogram [25, 25, 24, 24, 24, 24, 1, 1, 1, 1, 1] [2024-11-09 07:19:57,452 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2024-11-09 07:19:57,633 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2024-11-09 07:19:57,633 INFO L396 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:19:57,633 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:19:57,633 INFO L85 PathProgramCache]: Analyzing trace with hash -1632436567, now seen corresponding path program 47 times [2024-11-09 07:19:57,634 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:19:57,634 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1650281068] [2024-11-09 07:19:57,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:19:57,634 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:19:57,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:19:59,407 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 1083 proven. 669 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:19:59,408 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:19:59,408 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1650281068] [2024-11-09 07:19:59,408 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1650281068] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:19:59,408 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1984666696] [2024-11-09 07:19:59,408 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:19:59,408 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:19:59,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:19:59,410 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:19:59,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2024-11-09 07:19:59,678 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2024-11-09 07:19:59,678 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:19:59,682 INFO L255 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 52 conjuncts are in the unsatisfiable core [2024-11-09 07:19:59,685 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:20:01,611 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 1176 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:01,611 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:20:03,054 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 1176 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:03,054 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1984666696] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:20:03,054 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1866810338] [2024-11-09 07:20:03,056 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:20:03,056 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:20:03,056 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:20:03,056 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:20:03,056 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:20:03,219 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:20:04,135 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '37536#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:20:04,135 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:20:04,135 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:20:04,136 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 79 [2024-11-09 07:20:04,136 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009158746] [2024-11-09 07:20:04,136 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:20:04,136 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2024-11-09 07:20:04,136 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:20:04,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2024-11-09 07:20:04,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1484, Invalid=6172, Unknown=0, NotChecked=0, Total=7656 [2024-11-09 07:20:04,138 INFO L87 Difference]: Start difference. First operand 153 states and 155 transitions. Second operand has 80 states, 80 states have (on average 3.2125) internal successors, (257), 79 states have internal predecessors, (257), 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) [2024-11-09 07:20:04,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:20:04,814 INFO L93 Difference]: Finished difference Result 259 states and 263 transitions. [2024-11-09 07:20:04,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2024-11-09 07:20:04,815 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 3.2125) internal successors, (257), 79 states have internal predecessors, (257), 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 151 [2024-11-09 07:20:04,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:20:04,816 INFO L225 Difference]: With dead ends: 259 [2024-11-09 07:20:04,816 INFO L226 Difference]: Without dead ends: 155 [2024-11-09 07:20:04,817 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 368 SyntacticMatches, 49 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4700 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=1484, Invalid=6172, Unknown=0, NotChecked=0, Total=7656 [2024-11-09 07:20:04,817 INFO L432 NwaCegarLoop]: 27 mSDtfsCounter, 1 mSDsluCounter, 280 mSDsCounter, 0 mSdLazyCounter, 928 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 307 SdHoareTripleChecker+Invalid, 929 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 928 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-11-09 07:20:04,818 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 307 Invalid, 929 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 928 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2024-11-09 07:20:04,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2024-11-09 07:20:04,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 155. [2024-11-09 07:20:04,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 154 states have (on average 1.0194805194805194) internal successors, (157), 154 states have internal predecessors, (157), 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) [2024-11-09 07:20:04,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 157 transitions. [2024-11-09 07:20:04,830 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 157 transitions. Word has length 151 [2024-11-09 07:20:04,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:20:04,830 INFO L471 AbstractCegarLoop]: Abstraction has 155 states and 157 transitions. [2024-11-09 07:20:04,831 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 3.2125) internal successors, (257), 79 states have internal predecessors, (257), 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) [2024-11-09 07:20:04,831 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 157 transitions. [2024-11-09 07:20:04,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2024-11-09 07:20:04,832 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:20:04,832 INFO L215 NwaCegarLoop]: trace histogram [25, 25, 25, 25, 24, 24, 1, 1, 1, 1, 1] [2024-11-09 07:20:04,861 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Ended with exit code 0 [2024-11-09 07:20:05,033 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2024-11-09 07:20:05,033 INFO L396 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:20:05,033 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:20:05,034 INFO L85 PathProgramCache]: Analyzing trace with hash -462738514, now seen corresponding path program 48 times [2024-11-09 07:20:05,034 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:20:05,034 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1751458843] [2024-11-09 07:20:05,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:20:05,034 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:20:05,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:20:06,070 INFO L134 CoverageAnalysis]: Checked inductivity of 1801 backedges. 576 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:06,070 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:20:06,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1751458843] [2024-11-09 07:20:06,071 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1751458843] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:20:06,071 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1489764217] [2024-11-09 07:20:06,071 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:20:06,071 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:20:06,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:20:06,072 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:20:06,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2024-11-09 07:20:06,304 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:20:06,305 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:20:06,308 INFO L255 TraceCheckSpWp]: Trace formula consists of 449 conjuncts, 56 conjuncts are in the unsatisfiable core [2024-11-09 07:20:06,311 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:20:06,554 INFO L134 CoverageAnalysis]: Checked inductivity of 1801 backedges. 625 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:06,555 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:20:07,589 INFO L134 CoverageAnalysis]: Checked inductivity of 1801 backedges. 625 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:07,589 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1489764217] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:20:07,589 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2013788667] [2024-11-09 07:20:07,590 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:20:07,590 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:20:07,590 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:20:07,590 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:20:07,590 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:20:07,760 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:20:08,332 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39029#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:20:08,332 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:20:08,332 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:20:08,332 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 30 [2024-11-09 07:20:08,332 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095367377] [2024-11-09 07:20:08,333 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:20:08,333 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2024-11-09 07:20:08,333 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:20:08,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2024-11-09 07:20:08,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=414, Invalid=1068, Unknown=0, NotChecked=0, Total=1482 [2024-11-09 07:20:08,335 INFO L87 Difference]: Start difference. First operand 155 states and 157 transitions. Second operand has 31 states, 31 states have (on average 5.096774193548387) internal successors, (158), 30 states have internal predecessors, (158), 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) [2024-11-09 07:20:09,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:20:09,017 INFO L93 Difference]: Finished difference Result 168 states and 170 transitions. [2024-11-09 07:20:09,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2024-11-09 07:20:09,018 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 5.096774193548387) internal successors, (158), 30 states have internal predecessors, (158), 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 153 [2024-11-09 07:20:09,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:20:09,019 INFO L225 Difference]: With dead ends: 168 [2024-11-09 07:20:09,019 INFO L226 Difference]: Without dead ends: 166 [2024-11-09 07:20:09,019 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 534 GetRequests, 422 SyntacticMatches, 50 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1716 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1164, Invalid=2868, Unknown=0, NotChecked=0, Total=4032 [2024-11-09 07:20:09,020 INFO L432 NwaCegarLoop]: 32 mSDtfsCounter, 12 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 232 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 233 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 232 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 07:20:09,020 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 194 Invalid, 233 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 232 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 07:20:09,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2024-11-09 07:20:09,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 159. [2024-11-09 07:20:09,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 158 states have (on average 1.018987341772152) internal successors, (161), 158 states have internal predecessors, (161), 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) [2024-11-09 07:20:09,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 161 transitions. [2024-11-09 07:20:09,035 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 161 transitions. Word has length 153 [2024-11-09 07:20:09,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:20:09,035 INFO L471 AbstractCegarLoop]: Abstraction has 159 states and 161 transitions. [2024-11-09 07:20:09,036 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 5.096774193548387) internal successors, (158), 30 states have internal predecessors, (158), 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) [2024-11-09 07:20:09,036 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 161 transitions. [2024-11-09 07:20:09,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2024-11-09 07:20:09,037 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:20:09,037 INFO L215 NwaCegarLoop]: trace histogram [26, 26, 25, 25, 25, 25, 1, 1, 1, 1, 1] [2024-11-09 07:20:09,062 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Ended with exit code 0 [2024-11-09 07:20:09,237 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2024-11-09 07:20:09,238 INFO L396 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:20:09,238 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:20:09,238 INFO L85 PathProgramCache]: Analyzing trace with hash 660041046, now seen corresponding path program 49 times [2024-11-09 07:20:09,239 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:20:09,239 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2063382118] [2024-11-09 07:20:09,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:20:09,239 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:20:09,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:20:11,193 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 1178 proven. 722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:11,194 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:20:11,194 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2063382118] [2024-11-09 07:20:11,194 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2063382118] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:20:11,194 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [764490850] [2024-11-09 07:20:11,194 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:20:11,194 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:20:11,194 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:20:11,196 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:20:11,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2024-11-09 07:20:11,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:20:11,438 INFO L255 TraceCheckSpWp]: Trace formula consists of 460 conjuncts, 54 conjuncts are in the unsatisfiable core [2024-11-09 07:20:11,443 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:20:13,305 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 1275 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:13,305 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:20:14,490 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 1275 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:14,490 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [764490850] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:20:14,491 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1680932557] [2024-11-09 07:20:14,491 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:20:14,491 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:20:14,492 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:20:14,492 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:20:14,492 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:20:14,615 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:20:15,345 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '40538#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:20:15,345 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:20:15,345 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:20:15,345 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 82 [2024-11-09 07:20:15,345 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1124505752] [2024-11-09 07:20:15,346 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:20:15,346 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2024-11-09 07:20:15,346 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:20:15,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2024-11-09 07:20:15,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1594, Invalid=6596, Unknown=0, NotChecked=0, Total=8190 [2024-11-09 07:20:15,348 INFO L87 Difference]: Start difference. First operand 159 states and 161 transitions. Second operand has 83 states, 83 states have (on average 3.216867469879518) internal successors, (267), 82 states have internal predecessors, (267), 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) [2024-11-09 07:20:16,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:20:16,017 INFO L93 Difference]: Finished difference Result 269 states and 273 transitions. [2024-11-09 07:20:16,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2024-11-09 07:20:16,017 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 3.216867469879518) internal successors, (267), 82 states have internal predecessors, (267), 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 157 [2024-11-09 07:20:16,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:20:16,019 INFO L225 Difference]: With dead ends: 269 [2024-11-09 07:20:16,019 INFO L226 Difference]: Without dead ends: 161 [2024-11-09 07:20:16,020 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 523 GetRequests, 383 SyntacticMatches, 51 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5044 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=1594, Invalid=6596, Unknown=0, NotChecked=0, Total=8190 [2024-11-09 07:20:16,021 INFO L432 NwaCegarLoop]: 28 mSDtfsCounter, 1 mSDsluCounter, 297 mSDsCounter, 0 mSdLazyCounter, 975 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 325 SdHoareTripleChecker+Invalid, 976 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 975 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-11-09 07:20:16,021 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 325 Invalid, 976 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 975 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2024-11-09 07:20:16,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2024-11-09 07:20:16,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 161. [2024-11-09 07:20:16,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 160 states have (on average 1.01875) internal successors, (163), 160 states have internal predecessors, (163), 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) [2024-11-09 07:20:16,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 163 transitions. [2024-11-09 07:20:16,037 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 163 transitions. Word has length 157 [2024-11-09 07:20:16,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:20:16,038 INFO L471 AbstractCegarLoop]: Abstraction has 161 states and 163 transitions. [2024-11-09 07:20:16,038 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 3.216867469879518) internal successors, (267), 82 states have internal predecessors, (267), 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) [2024-11-09 07:20:16,038 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 163 transitions. [2024-11-09 07:20:16,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2024-11-09 07:20:16,040 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:20:16,040 INFO L215 NwaCegarLoop]: trace histogram [26, 26, 26, 26, 25, 25, 1, 1, 1, 1, 1] [2024-11-09 07:20:16,069 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Ended with exit code 0 [2024-11-09 07:20:16,240 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable50 [2024-11-09 07:20:16,241 INFO L396 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:20:16,241 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:20:16,241 INFO L85 PathProgramCache]: Analyzing trace with hash -1007091045, now seen corresponding path program 50 times [2024-11-09 07:20:16,241 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:20:16,241 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1336965641] [2024-11-09 07:20:16,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:20:16,242 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:20:16,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:20:17,312 INFO L134 CoverageAnalysis]: Checked inductivity of 1951 backedges. 625 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:17,312 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:20:17,312 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1336965641] [2024-11-09 07:20:17,312 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1336965641] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:20:17,313 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1974948776] [2024-11-09 07:20:17,313 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:20:17,313 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:20:17,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:20:17,314 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:20:17,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2024-11-09 07:20:17,590 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2024-11-09 07:20:17,590 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:20:17,593 INFO L255 TraceCheckSpWp]: Trace formula consists of 466 conjuncts, 58 conjuncts are in the unsatisfiable core [2024-11-09 07:20:17,596 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:20:17,843 INFO L134 CoverageAnalysis]: Checked inductivity of 1951 backedges. 676 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:17,843 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:20:18,865 INFO L134 CoverageAnalysis]: Checked inductivity of 1951 backedges. 676 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:18,865 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1974948776] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:20:18,865 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1650156891] [2024-11-09 07:20:18,866 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:20:18,866 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:20:18,866 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:20:18,867 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:20:18,867 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:20:19,025 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:20:19,589 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42089#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:20:19,589 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:20:19,589 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:20:19,590 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 31 [2024-11-09 07:20:19,590 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059495933] [2024-11-09 07:20:19,590 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:20:19,591 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2024-11-09 07:20:19,591 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:20:19,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2024-11-09 07:20:19,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=442, Invalid=1118, Unknown=0, NotChecked=0, Total=1560 [2024-11-09 07:20:19,592 INFO L87 Difference]: Start difference. First operand 161 states and 163 transitions. Second operand has 32 states, 32 states have (on average 5.125) internal successors, (164), 31 states have internal predecessors, (164), 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) [2024-11-09 07:20:20,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:20:20,326 INFO L93 Difference]: Finished difference Result 174 states and 176 transitions. [2024-11-09 07:20:20,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2024-11-09 07:20:20,326 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 5.125) internal successors, (164), 31 states have internal predecessors, (164), 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 159 [2024-11-09 07:20:20,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:20:20,327 INFO L225 Difference]: With dead ends: 174 [2024-11-09 07:20:20,327 INFO L226 Difference]: Without dead ends: 172 [2024-11-09 07:20:20,328 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 555 GetRequests, 439 SyntacticMatches, 52 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1836 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1248, Invalid=3042, Unknown=0, NotChecked=0, Total=4290 [2024-11-09 07:20:20,329 INFO L432 NwaCegarLoop]: 33 mSDtfsCounter, 13 mSDsluCounter, 210 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 278 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 07:20:20,329 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 243 Invalid, 278 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 277 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 07:20:20,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2024-11-09 07:20:20,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 165. [2024-11-09 07:20:20,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 164 states have (on average 1.0182926829268293) internal successors, (167), 164 states have internal predecessors, (167), 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) [2024-11-09 07:20:20,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 167 transitions. [2024-11-09 07:20:20,348 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 167 transitions. Word has length 159 [2024-11-09 07:20:20,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:20:20,348 INFO L471 AbstractCegarLoop]: Abstraction has 165 states and 167 transitions. [2024-11-09 07:20:20,348 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 5.125) internal successors, (164), 31 states have internal predecessors, (164), 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) [2024-11-09 07:20:20,349 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 167 transitions. [2024-11-09 07:20:20,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2024-11-09 07:20:20,350 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:20:20,350 INFO L215 NwaCegarLoop]: trace histogram [27, 27, 26, 26, 26, 26, 1, 1, 1, 1, 1] [2024-11-09 07:20:20,373 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2024-11-09 07:20:20,550 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:20:20,551 INFO L396 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:20:20,551 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:20:20,551 INFO L85 PathProgramCache]: Analyzing trace with hash 1293288899, now seen corresponding path program 51 times [2024-11-09 07:20:20,551 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:20:20,551 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [690100823] [2024-11-09 07:20:20,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:20:20,551 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:20:20,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:20:22,609 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 1277 proven. 777 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:22,610 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:20:22,610 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [690100823] [2024-11-09 07:20:22,610 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [690100823] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:20:22,610 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1507263178] [2024-11-09 07:20:22,610 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:20:22,610 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:20:22,611 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:20:22,612 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:20:22,614 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2024-11-09 07:20:22,850 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:20:22,851 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:20:22,854 INFO L255 TraceCheckSpWp]: Trace formula consists of 477 conjuncts, 56 conjuncts are in the unsatisfiable core [2024-11-09 07:20:22,858 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:20:25,040 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 1378 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:25,040 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:20:26,606 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 1378 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:26,606 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1507263178] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:20:26,606 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [250051811] [2024-11-09 07:20:26,607 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:20:26,607 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:20:26,607 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:20:26,607 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:20:26,607 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:20:26,807 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:20:27,760 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '43655#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:20:27,760 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:20:27,761 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:20:27,761 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 85 [2024-11-09 07:20:27,761 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113533238] [2024-11-09 07:20:27,761 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:20:27,762 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2024-11-09 07:20:27,762 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:20:27,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2024-11-09 07:20:27,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1708, Invalid=7034, Unknown=0, NotChecked=0, Total=8742 [2024-11-09 07:20:27,763 INFO L87 Difference]: Start difference. First operand 165 states and 167 transitions. Second operand has 86 states, 86 states have (on average 3.2209302325581395) internal successors, (277), 85 states have internal predecessors, (277), 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) [2024-11-09 07:20:28,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:20:28,389 INFO L93 Difference]: Finished difference Result 279 states and 283 transitions. [2024-11-09 07:20:28,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2024-11-09 07:20:28,390 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 3.2209302325581395) internal successors, (277), 85 states have internal predecessors, (277), 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 163 [2024-11-09 07:20:28,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:20:28,391 INFO L225 Difference]: With dead ends: 279 [2024-11-09 07:20:28,391 INFO L226 Difference]: Without dead ends: 167 [2024-11-09 07:20:28,392 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 543 GetRequests, 398 SyntacticMatches, 53 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5400 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=1708, Invalid=7034, Unknown=0, NotChecked=0, Total=8742 [2024-11-09 07:20:28,393 INFO L432 NwaCegarLoop]: 29 mSDtfsCounter, 1 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 780 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 781 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 780 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-11-09 07:20:28,393 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 251 Invalid, 781 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 780 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-11-09 07:20:28,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2024-11-09 07:20:28,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 167. [2024-11-09 07:20:28,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 166 states have (on average 1.0180722891566265) internal successors, (169), 166 states have internal predecessors, (169), 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) [2024-11-09 07:20:28,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 169 transitions. [2024-11-09 07:20:28,420 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 169 transitions. Word has length 163 [2024-11-09 07:20:28,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:20:28,421 INFO L471 AbstractCegarLoop]: Abstraction has 167 states and 169 transitions. [2024-11-09 07:20:28,421 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 86 states have (on average 3.2209302325581395) internal successors, (277), 85 states have internal predecessors, (277), 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) [2024-11-09 07:20:28,421 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 169 transitions. [2024-11-09 07:20:28,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2024-11-09 07:20:28,423 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:20:28,423 INFO L215 NwaCegarLoop]: trace histogram [27, 27, 27, 27, 26, 26, 1, 1, 1, 1, 1] [2024-11-09 07:20:28,452 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2024-11-09 07:20:28,623 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:20:28,624 INFO L396 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:20:28,624 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:20:28,625 INFO L85 PathProgramCache]: Analyzing trace with hash 1870779208, now seen corresponding path program 52 times [2024-11-09 07:20:28,625 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:20:28,625 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634338440] [2024-11-09 07:20:28,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:20:28,625 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:20:28,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:20:29,798 INFO L134 CoverageAnalysis]: Checked inductivity of 2107 backedges. 676 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:29,798 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:20:29,798 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1634338440] [2024-11-09 07:20:29,798 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1634338440] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:20:29,799 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [187701000] [2024-11-09 07:20:29,799 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:20:29,799 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:20:29,799 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:20:29,800 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:20:29,801 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2024-11-09 07:20:30,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:20:30,032 INFO L255 TraceCheckSpWp]: Trace formula consists of 483 conjuncts, 57 conjuncts are in the unsatisfiable core [2024-11-09 07:20:30,034 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:20:30,294 INFO L134 CoverageAnalysis]: Checked inductivity of 2107 backedges. 729 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:30,294 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:20:31,413 INFO L134 CoverageAnalysis]: Checked inductivity of 2107 backedges. 729 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:31,413 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [187701000] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:20:31,414 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1388778342] [2024-11-09 07:20:31,414 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:20:31,415 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:20:31,415 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:20:31,415 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:20:31,415 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:20:31,641 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:20:32,213 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45264#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:20:32,214 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:20:32,214 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:20:32,214 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 32 [2024-11-09 07:20:32,214 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2580983] [2024-11-09 07:20:32,214 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:20:32,214 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2024-11-09 07:20:32,215 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:20:32,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2024-11-09 07:20:32,215 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=1169, Unknown=0, NotChecked=0, Total=1640 [2024-11-09 07:20:32,216 INFO L87 Difference]: Start difference. First operand 167 states and 169 transitions. Second operand has 33 states, 33 states have (on average 5.151515151515151) internal successors, (170), 32 states have internal predecessors, (170), 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) [2024-11-09 07:20:33,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:20:33,056 INFO L93 Difference]: Finished difference Result 180 states and 182 transitions. [2024-11-09 07:20:33,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2024-11-09 07:20:33,057 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 5.151515151515151) internal successors, (170), 32 states have internal predecessors, (170), 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 165 [2024-11-09 07:20:33,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:20:33,058 INFO L225 Difference]: With dead ends: 180 [2024-11-09 07:20:33,058 INFO L226 Difference]: Without dead ends: 178 [2024-11-09 07:20:33,059 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 576 GetRequests, 455 SyntacticMatches, 55 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1987 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1335, Invalid=3221, Unknown=0, NotChecked=0, Total=4556 [2024-11-09 07:20:33,059 INFO L432 NwaCegarLoop]: 34 mSDtfsCounter, 13 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 285 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 245 SdHoareTripleChecker+Invalid, 286 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 285 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 07:20:33,059 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 245 Invalid, 286 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 285 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 07:20:33,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2024-11-09 07:20:33,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 171. [2024-11-09 07:20:33,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 170 states have (on average 1.0176470588235293) internal successors, (173), 170 states have internal predecessors, (173), 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) [2024-11-09 07:20:33,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 173 transitions. [2024-11-09 07:20:33,069 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 173 transitions. Word has length 165 [2024-11-09 07:20:33,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:20:33,070 INFO L471 AbstractCegarLoop]: Abstraction has 171 states and 173 transitions. [2024-11-09 07:20:33,070 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 5.151515151515151) internal successors, (170), 32 states have internal predecessors, (170), 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) [2024-11-09 07:20:33,070 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 173 transitions. [2024-11-09 07:20:33,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2024-11-09 07:20:33,071 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:20:33,072 INFO L215 NwaCegarLoop]: trace histogram [28, 28, 27, 27, 27, 27, 1, 1, 1, 1, 1] [2024-11-09 07:20:33,096 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2024-11-09 07:20:33,272 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2024-11-09 07:20:33,272 INFO L396 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:20:33,273 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:20:33,273 INFO L85 PathProgramCache]: Analyzing trace with hash 1899804656, now seen corresponding path program 53 times [2024-11-09 07:20:33,273 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:20:33,273 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [790067363] [2024-11-09 07:20:33,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:20:33,273 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:20:33,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:20:35,456 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 1380 proven. 834 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:35,456 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:20:35,456 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [790067363] [2024-11-09 07:20:35,456 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [790067363] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:20:35,456 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1196740766] [2024-11-09 07:20:35,456 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:20:35,457 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:20:35,457 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:20:35,458 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:20:35,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2024-11-09 07:20:35,757 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2024-11-09 07:20:35,757 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:20:35,761 INFO L255 TraceCheckSpWp]: Trace formula consists of 494 conjuncts, 58 conjuncts are in the unsatisfiable core [2024-11-09 07:20:35,764 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:20:37,982 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 1485 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:37,983 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:20:39,724 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 1485 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:39,724 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1196740766] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:20:39,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [775803972] [2024-11-09 07:20:39,726 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:20:39,726 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:20:39,726 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:20:39,726 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:20:39,726 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:20:39,936 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:20:40,947 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '46887#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:20:40,948 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:20:40,948 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:20:40,948 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 88 [2024-11-09 07:20:40,948 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790658689] [2024-11-09 07:20:40,948 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:20:40,949 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2024-11-09 07:20:40,949 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:20:40,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2024-11-09 07:20:40,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1826, Invalid=7486, Unknown=0, NotChecked=0, Total=9312 [2024-11-09 07:20:40,951 INFO L87 Difference]: Start difference. First operand 171 states and 173 transitions. Second operand has 89 states, 89 states have (on average 3.2247191011235956) internal successors, (287), 88 states have internal predecessors, (287), 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) [2024-11-09 07:20:41,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:20:41,732 INFO L93 Difference]: Finished difference Result 289 states and 293 transitions. [2024-11-09 07:20:41,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2024-11-09 07:20:41,733 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 3.2247191011235956) internal successors, (287), 88 states have internal predecessors, (287), 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 169 [2024-11-09 07:20:41,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:20:41,734 INFO L225 Difference]: With dead ends: 289 [2024-11-09 07:20:41,734 INFO L226 Difference]: Without dead ends: 173 [2024-11-09 07:20:41,735 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 563 GetRequests, 413 SyntacticMatches, 55 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5768 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=1826, Invalid=7486, Unknown=0, NotChecked=0, Total=9312 [2024-11-09 07:20:41,735 INFO L432 NwaCegarLoop]: 30 mSDtfsCounter, 1 mSDsluCounter, 331 mSDsCounter, 0 mSdLazyCounter, 1087 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 361 SdHoareTripleChecker+Invalid, 1088 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1087 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-11-09 07:20:41,736 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 361 Invalid, 1088 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1087 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2024-11-09 07:20:41,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2024-11-09 07:20:41,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 173. [2024-11-09 07:20:41,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 172 states have (on average 1.0174418604651163) internal successors, (175), 172 states have internal predecessors, (175), 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) [2024-11-09 07:20:41,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 175 transitions. [2024-11-09 07:20:41,745 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 175 transitions. Word has length 169 [2024-11-09 07:20:41,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:20:41,745 INFO L471 AbstractCegarLoop]: Abstraction has 173 states and 175 transitions. [2024-11-09 07:20:41,745 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 89 states have (on average 3.2247191011235956) internal successors, (287), 88 states have internal predecessors, (287), 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) [2024-11-09 07:20:41,746 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 175 transitions. [2024-11-09 07:20:41,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2024-11-09 07:20:41,746 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:20:41,746 INFO L215 NwaCegarLoop]: trace histogram [28, 28, 28, 28, 27, 27, 1, 1, 1, 1, 1] [2024-11-09 07:20:41,773 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2024-11-09 07:20:41,947 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2024-11-09 07:20:41,947 INFO L396 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:20:41,947 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:20:41,947 INFO L85 PathProgramCache]: Analyzing trace with hash -1334342219, now seen corresponding path program 54 times [2024-11-09 07:20:41,948 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:20:41,948 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657078252] [2024-11-09 07:20:41,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:20:41,948 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:20:41,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:20:43,315 INFO L134 CoverageAnalysis]: Checked inductivity of 2269 backedges. 729 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:43,316 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:20:43,316 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657078252] [2024-11-09 07:20:43,316 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [657078252] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:20:43,316 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [153218391] [2024-11-09 07:20:43,316 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:20:43,316 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:20:43,316 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:20:43,318 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:20:43,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2024-11-09 07:20:43,572 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:20:43,572 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:20:43,576 INFO L255 TraceCheckSpWp]: Trace formula consists of 500 conjuncts, 62 conjuncts are in the unsatisfiable core [2024-11-09 07:20:43,580 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:20:43,862 INFO L134 CoverageAnalysis]: Checked inductivity of 2269 backedges. 784 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:43,862 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:20:45,035 INFO L134 CoverageAnalysis]: Checked inductivity of 2269 backedges. 784 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:45,035 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [153218391] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:20:45,035 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [21622549] [2024-11-09 07:20:45,036 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:20:45,036 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:20:45,037 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:20:45,037 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:20:45,037 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:20:45,192 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:20:45,768 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '48554#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:20:45,768 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:20:45,768 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:20:45,769 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 33 [2024-11-09 07:20:45,769 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061598338] [2024-11-09 07:20:45,769 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:20:45,769 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2024-11-09 07:20:45,769 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:20:45,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2024-11-09 07:20:45,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=501, Invalid=1221, Unknown=0, NotChecked=0, Total=1722 [2024-11-09 07:20:45,770 INFO L87 Difference]: Start difference. First operand 173 states and 175 transitions. Second operand has 34 states, 34 states have (on average 5.176470588235294) internal successors, (176), 33 states have internal predecessors, (176), 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) [2024-11-09 07:20:46,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:20:46,534 INFO L93 Difference]: Finished difference Result 186 states and 188 transitions. [2024-11-09 07:20:46,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2024-11-09 07:20:46,535 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 5.176470588235294) internal successors, (176), 33 states have internal predecessors, (176), 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 171 [2024-11-09 07:20:46,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:20:46,536 INFO L225 Difference]: With dead ends: 186 [2024-11-09 07:20:46,537 INFO L226 Difference]: Without dead ends: 184 [2024-11-09 07:20:46,537 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 597 GetRequests, 473 SyntacticMatches, 56 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2088 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1425, Invalid=3405, Unknown=0, NotChecked=0, Total=4830 [2024-11-09 07:20:46,538 INFO L432 NwaCegarLoop]: 35 mSDtfsCounter, 14 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 246 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 246 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 07:20:46,538 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 204 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 246 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 07:20:46,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2024-11-09 07:20:46,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 177. [2024-11-09 07:20:46,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 176 states have (on average 1.0170454545454546) internal successors, (179), 176 states have internal predecessors, (179), 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) [2024-11-09 07:20:46,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 179 transitions. [2024-11-09 07:20:46,556 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 179 transitions. Word has length 171 [2024-11-09 07:20:46,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:20:46,556 INFO L471 AbstractCegarLoop]: Abstraction has 177 states and 179 transitions. [2024-11-09 07:20:46,557 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 5.176470588235294) internal successors, (176), 33 states have internal predecessors, (176), 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) [2024-11-09 07:20:46,557 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 179 transitions. [2024-11-09 07:20:46,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2024-11-09 07:20:46,558 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:20:46,558 INFO L215 NwaCegarLoop]: trace histogram [29, 29, 28, 28, 28, 28, 1, 1, 1, 1, 1] [2024-11-09 07:20:46,587 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Ended with exit code 0 [2024-11-09 07:20:46,759 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:20:46,759 INFO L396 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:20:46,759 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:20:46,759 INFO L85 PathProgramCache]: Analyzing trace with hash 1925542877, now seen corresponding path program 55 times [2024-11-09 07:20:46,759 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:20:46,760 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1186923902] [2024-11-09 07:20:46,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:20:46,760 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:20:46,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:20:49,085 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1487 proven. 893 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:49,085 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:20:49,085 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1186923902] [2024-11-09 07:20:49,085 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1186923902] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:20:49,085 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1926745484] [2024-11-09 07:20:49,085 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:20:49,085 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:20:49,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:20:49,087 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:20:49,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2024-11-09 07:20:49,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:20:49,346 INFO L255 TraceCheckSpWp]: Trace formula consists of 511 conjuncts, 60 conjuncts are in the unsatisfiable core [2024-11-09 07:20:49,350 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:20:51,875 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1596 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:51,876 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:20:53,452 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1596 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:53,452 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1926745484] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:20:53,452 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1341519329] [2024-11-09 07:20:53,453 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:20:53,453 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:20:53,453 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:20:53,453 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:20:53,453 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:20:53,608 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:20:54,377 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '50234#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:20:54,377 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:20:54,377 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:20:54,378 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 91 [2024-11-09 07:20:54,378 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097523124] [2024-11-09 07:20:54,378 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:20:54,379 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2024-11-09 07:20:54,379 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:20:54,380 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2024-11-09 07:20:54,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1948, Invalid=7952, Unknown=0, NotChecked=0, Total=9900 [2024-11-09 07:20:54,381 INFO L87 Difference]: Start difference. First operand 177 states and 179 transitions. Second operand has 92 states, 92 states have (on average 3.2282608695652173) internal successors, (297), 91 states have internal predecessors, (297), 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) [2024-11-09 07:20:54,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:20:54,992 INFO L93 Difference]: Finished difference Result 299 states and 303 transitions. [2024-11-09 07:20:54,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2024-11-09 07:20:54,993 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 92 states have (on average 3.2282608695652173) internal successors, (297), 91 states have internal predecessors, (297), 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 175 [2024-11-09 07:20:54,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:20:54,994 INFO L225 Difference]: With dead ends: 299 [2024-11-09 07:20:54,994 INFO L226 Difference]: Without dead ends: 179 [2024-11-09 07:20:54,995 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 583 GetRequests, 428 SyntacticMatches, 57 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6148 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=1948, Invalid=7952, Unknown=0, NotChecked=0, Total=9900 [2024-11-09 07:20:54,995 INFO L432 NwaCegarLoop]: 31 mSDtfsCounter, 1 mSDsluCounter, 273 mSDsCounter, 0 mSdLazyCounter, 930 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 304 SdHoareTripleChecker+Invalid, 931 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 930 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-11-09 07:20:54,995 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 304 Invalid, 931 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 930 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-11-09 07:20:54,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2024-11-09 07:20:55,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2024-11-09 07:20:55,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 178 states have (on average 1.0168539325842696) internal successors, (181), 178 states have internal predecessors, (181), 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) [2024-11-09 07:20:55,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 181 transitions. [2024-11-09 07:20:55,013 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 181 transitions. Word has length 175 [2024-11-09 07:20:55,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:20:55,013 INFO L471 AbstractCegarLoop]: Abstraction has 179 states and 181 transitions. [2024-11-09 07:20:55,014 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 92 states have (on average 3.2282608695652173) internal successors, (297), 91 states have internal predecessors, (297), 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) [2024-11-09 07:20:55,014 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 181 transitions. [2024-11-09 07:20:55,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2024-11-09 07:20:55,015 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:20:55,016 INFO L215 NwaCegarLoop]: trace histogram [29, 29, 29, 29, 28, 28, 1, 1, 1, 1, 1] [2024-11-09 07:20:55,043 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Ended with exit code 0 [2024-11-09 07:20:55,216 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:20:55,216 INFO L396 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:20:55,217 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:20:55,217 INFO L85 PathProgramCache]: Analyzing trace with hash 586686946, now seen corresponding path program 56 times [2024-11-09 07:20:55,217 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:20:55,217 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1801242990] [2024-11-09 07:20:55,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:20:55,217 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:20:55,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:20:56,572 INFO L134 CoverageAnalysis]: Checked inductivity of 2437 backedges. 784 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:56,572 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:20:56,572 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1801242990] [2024-11-09 07:20:56,572 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1801242990] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:20:56,572 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [621803890] [2024-11-09 07:20:56,572 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:20:56,573 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:20:56,573 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:20:56,574 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:20:56,575 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2024-11-09 07:20:56,886 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2024-11-09 07:20:56,886 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:20:56,891 INFO L255 TraceCheckSpWp]: Trace formula consists of 517 conjuncts, 64 conjuncts are in the unsatisfiable core [2024-11-09 07:20:56,894 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:20:57,176 INFO L134 CoverageAnalysis]: Checked inductivity of 2437 backedges. 841 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:57,176 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:20:58,399 INFO L134 CoverageAnalysis]: Checked inductivity of 2437 backedges. 841 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:20:58,399 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [621803890] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:20:58,400 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [248380077] [2024-11-09 07:20:58,401 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:20:58,401 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:20:58,401 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:20:58,401 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:20:58,401 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:20:58,555 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:20:59,128 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '51959#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:20:59,129 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:20:59,129 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:20:59,129 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 34 [2024-11-09 07:20:59,129 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [271751742] [2024-11-09 07:20:59,129 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:20:59,130 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2024-11-09 07:20:59,130 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:20:59,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2024-11-09 07:20:59,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=532, Invalid=1274, Unknown=0, NotChecked=0, Total=1806 [2024-11-09 07:20:59,131 INFO L87 Difference]: Start difference. First operand 179 states and 181 transitions. Second operand has 35 states, 35 states have (on average 5.2) internal successors, (182), 34 states have internal predecessors, (182), 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) [2024-11-09 07:20:59,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:20:59,921 INFO L93 Difference]: Finished difference Result 192 states and 194 transitions. [2024-11-09 07:20:59,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2024-11-09 07:20:59,922 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 5.2) internal successors, (182), 34 states have internal predecessors, (182), 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 177 [2024-11-09 07:20:59,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:20:59,923 INFO L225 Difference]: With dead ends: 192 [2024-11-09 07:20:59,923 INFO L226 Difference]: Without dead ends: 190 [2024-11-09 07:20:59,924 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 618 GetRequests, 490 SyntacticMatches, 58 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2220 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1518, Invalid=3594, Unknown=0, NotChecked=0, Total=5112 [2024-11-09 07:20:59,924 INFO L432 NwaCegarLoop]: 36 mSDtfsCounter, 16 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 266 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 266 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 07:20:59,925 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 224 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 266 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 07:20:59,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2024-11-09 07:20:59,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 183. [2024-11-09 07:20:59,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 182 states have (on average 1.0164835164835164) internal successors, (185), 182 states have internal predecessors, (185), 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) [2024-11-09 07:20:59,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 185 transitions. [2024-11-09 07:20:59,942 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 185 transitions. Word has length 177 [2024-11-09 07:20:59,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:20:59,942 INFO L471 AbstractCegarLoop]: Abstraction has 183 states and 185 transitions. [2024-11-09 07:20:59,943 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 5.2) internal successors, (182), 34 states have internal predecessors, (182), 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) [2024-11-09 07:20:59,943 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 185 transitions. [2024-11-09 07:20:59,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2024-11-09 07:20:59,944 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:20:59,944 INFO L215 NwaCegarLoop]: trace histogram [30, 30, 29, 29, 29, 29, 1, 1, 1, 1, 1] [2024-11-09 07:20:59,965 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2024-11-09 07:21:00,145 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2024-11-09 07:21:00,145 INFO L396 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:21:00,145 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:21:00,145 INFO L85 PathProgramCache]: Analyzing trace with hash -849991286, now seen corresponding path program 57 times [2024-11-09 07:21:00,145 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:21:00,146 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1201307336] [2024-11-09 07:21:00,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:21:00,146 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:21:00,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:21:02,579 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 1598 proven. 954 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:21:02,579 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:21:02,579 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1201307336] [2024-11-09 07:21:02,579 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1201307336] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:21:02,579 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [618454262] [2024-11-09 07:21:02,579 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:21:02,580 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:21:02,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:21:02,582 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:21:02,583 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2024-11-09 07:21:02,871 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:21:02,871 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:21:02,875 INFO L255 TraceCheckSpWp]: Trace formula consists of 528 conjuncts, 62 conjuncts are in the unsatisfiable core [2024-11-09 07:21:02,878 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:21:05,351 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 1711 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:21:05,352 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:21:07,240 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 1711 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:21:07,241 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [618454262] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:21:07,241 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [614471669] [2024-11-09 07:21:07,242 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:21:07,242 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:21:07,242 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:21:07,242 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:21:07,243 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:21:07,405 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:21:08,408 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '53696#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:21:08,408 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:21:08,408 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:21:08,409 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 94 [2024-11-09 07:21:08,409 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334390466] [2024-11-09 07:21:08,409 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:21:08,409 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 95 states [2024-11-09 07:21:08,410 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:21:08,410 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2024-11-09 07:21:08,411 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2074, Invalid=8432, Unknown=0, NotChecked=0, Total=10506 [2024-11-09 07:21:08,411 INFO L87 Difference]: Start difference. First operand 183 states and 185 transitions. Second operand has 95 states, 95 states have (on average 3.231578947368421) internal successors, (307), 94 states have internal predecessors, (307), 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) [2024-11-09 07:21:09,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:21:09,434 INFO L93 Difference]: Finished difference Result 309 states and 313 transitions. [2024-11-09 07:21:09,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2024-11-09 07:21:09,435 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 95 states have (on average 3.231578947368421) internal successors, (307), 94 states have internal predecessors, (307), 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 181 [2024-11-09 07:21:09,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:21:09,436 INFO L225 Difference]: With dead ends: 309 [2024-11-09 07:21:09,436 INFO L226 Difference]: Without dead ends: 185 [2024-11-09 07:21:09,438 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 603 GetRequests, 443 SyntacticMatches, 59 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6540 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=2074, Invalid=8432, Unknown=0, NotChecked=0, Total=10506 [2024-11-09 07:21:09,438 INFO L432 NwaCegarLoop]: 32 mSDtfsCounter, 1 mSDsluCounter, 472 mSDsCounter, 0 mSdLazyCounter, 1492 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 504 SdHoareTripleChecker+Invalid, 1493 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1492 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2024-11-09 07:21:09,439 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 504 Invalid, 1493 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1492 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2024-11-09 07:21:09,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2024-11-09 07:21:09,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 185. [2024-11-09 07:21:09,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 184 states have (on average 1.016304347826087) internal successors, (187), 184 states have internal predecessors, (187), 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) [2024-11-09 07:21:09,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 187 transitions. [2024-11-09 07:21:09,454 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 187 transitions. Word has length 181 [2024-11-09 07:21:09,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:21:09,455 INFO L471 AbstractCegarLoop]: Abstraction has 185 states and 187 transitions. [2024-11-09 07:21:09,455 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 95 states, 95 states have (on average 3.231578947368421) internal successors, (307), 94 states have internal predecessors, (307), 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) [2024-11-09 07:21:09,455 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 187 transitions. [2024-11-09 07:21:09,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2024-11-09 07:21:09,456 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:21:09,456 INFO L215 NwaCegarLoop]: trace histogram [30, 30, 30, 30, 29, 29, 1, 1, 1, 1, 1] [2024-11-09 07:21:09,484 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Ended with exit code 0 [2024-11-09 07:21:09,657 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2024-11-09 07:21:09,657 INFO L396 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:21:09,657 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:21:09,657 INFO L85 PathProgramCache]: Analyzing trace with hash -1798471729, now seen corresponding path program 58 times [2024-11-09 07:21:09,658 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:21:09,658 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1591431786] [2024-11-09 07:21:09,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:21:09,658 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:21:09,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:21:11,043 INFO L134 CoverageAnalysis]: Checked inductivity of 2611 backedges. 841 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:21:11,043 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:21:11,043 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1591431786] [2024-11-09 07:21:11,043 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1591431786] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:21:11,044 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [240078854] [2024-11-09 07:21:11,044 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:21:11,044 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:21:11,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:21:11,045 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:21:11,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2024-11-09 07:21:11,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:21:11,309 INFO L255 TraceCheckSpWp]: Trace formula consists of 534 conjuncts, 63 conjuncts are in the unsatisfiable core [2024-11-09 07:21:11,312 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:21:11,601 INFO L134 CoverageAnalysis]: Checked inductivity of 2611 backedges. 900 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:21:11,601 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:21:13,030 INFO L134 CoverageAnalysis]: Checked inductivity of 2611 backedges. 900 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:21:13,030 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [240078854] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:21:13,030 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1874158407] [2024-11-09 07:21:13,031 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:21:13,031 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:21:13,032 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:21:13,032 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:21:13,032 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:21:13,228 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:21:13,831 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '55479#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:21:13,831 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:21:13,832 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:21:13,832 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 35 [2024-11-09 07:21:13,832 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944294769] [2024-11-09 07:21:13,832 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:21:13,832 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2024-11-09 07:21:13,832 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:21:13,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2024-11-09 07:21:13,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=564, Invalid=1328, Unknown=0, NotChecked=0, Total=1892 [2024-11-09 07:21:13,834 INFO L87 Difference]: Start difference. First operand 185 states and 187 transitions. Second operand has 36 states, 36 states have (on average 5.222222222222222) internal successors, (188), 35 states have internal predecessors, (188), 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) [2024-11-09 07:21:14,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:21:14,685 INFO L93 Difference]: Finished difference Result 198 states and 200 transitions. [2024-11-09 07:21:14,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2024-11-09 07:21:14,685 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 5.222222222222222) internal successors, (188), 35 states have internal predecessors, (188), 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 183 [2024-11-09 07:21:14,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:21:14,686 INFO L225 Difference]: With dead ends: 198 [2024-11-09 07:21:14,686 INFO L226 Difference]: Without dead ends: 196 [2024-11-09 07:21:14,687 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 639 GetRequests, 506 SyntacticMatches, 61 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2386 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1614, Invalid=3788, Unknown=0, NotChecked=0, Total=5402 [2024-11-09 07:21:14,688 INFO L432 NwaCegarLoop]: 37 mSDtfsCounter, 17 mSDsluCounter, 215 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 297 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 07:21:14,688 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 252 Invalid, 297 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 296 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 07:21:14,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2024-11-09 07:21:14,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 189. [2024-11-09 07:21:14,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 188 states have (on average 1.0159574468085106) internal successors, (191), 188 states have internal predecessors, (191), 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) [2024-11-09 07:21:14,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 191 transitions. [2024-11-09 07:21:14,707 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 191 transitions. Word has length 183 [2024-11-09 07:21:14,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:21:14,707 INFO L471 AbstractCegarLoop]: Abstraction has 189 states and 191 transitions. [2024-11-09 07:21:14,708 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 5.222222222222222) internal successors, (188), 35 states have internal predecessors, (188), 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) [2024-11-09 07:21:14,708 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 191 transitions. [2024-11-09 07:21:14,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2024-11-09 07:21:14,709 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:21:14,709 INFO L215 NwaCegarLoop]: trace histogram [31, 31, 30, 30, 30, 30, 1, 1, 1, 1, 1] [2024-11-09 07:21:14,734 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Forceful destruction successful, exit code 0 [2024-11-09 07:21:14,910 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2024-11-09 07:21:14,910 INFO L396 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:21:14,910 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:21:14,910 INFO L85 PathProgramCache]: Analyzing trace with hash 2017511671, now seen corresponding path program 59 times [2024-11-09 07:21:14,911 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:21:14,911 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [670379078] [2024-11-09 07:21:14,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:21:14,911 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:21:14,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:21:17,099 INFO L134 CoverageAnalysis]: Checked inductivity of 2730 backedges. 1713 proven. 1017 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:21:17,100 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:21:17,100 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [670379078] [2024-11-09 07:21:17,100 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [670379078] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:21:17,100 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1874917328] [2024-11-09 07:21:17,100 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:21:17,100 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:21:17,100 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:21:17,101 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:21:17,103 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2024-11-09 07:21:17,377 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 31 check-sat command(s) [2024-11-09 07:21:17,377 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:21:17,380 INFO L255 TraceCheckSpWp]: Trace formula consists of 545 conjuncts, 64 conjuncts are in the unsatisfiable core [2024-11-09 07:21:17,383 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:21:19,598 INFO L134 CoverageAnalysis]: Checked inductivity of 2730 backedges. 1830 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:21:19,599 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:21:21,284 INFO L134 CoverageAnalysis]: Checked inductivity of 2730 backedges. 1830 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:21:21,285 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1874917328] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:21:21,285 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [274025268] [2024-11-09 07:21:21,286 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:21:21,286 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:21:21,286 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:21:21,286 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:21:21,286 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:21:21,489 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:21:22,451 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '57273#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:21:22,451 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:21:22,451 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:21:22,451 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 97 [2024-11-09 07:21:22,452 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272869430] [2024-11-09 07:21:22,452 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:21:22,452 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2024-11-09 07:21:22,453 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:21:22,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2024-11-09 07:21:22,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2204, Invalid=8926, Unknown=0, NotChecked=0, Total=11130 [2024-11-09 07:21:22,454 INFO L87 Difference]: Start difference. First operand 189 states and 191 transitions. Second operand has 98 states, 98 states have (on average 3.2346938775510203) internal successors, (317), 97 states have internal predecessors, (317), 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) [2024-11-09 07:21:23,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:21:23,453 INFO L93 Difference]: Finished difference Result 319 states and 323 transitions. [2024-11-09 07:21:23,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2024-11-09 07:21:23,454 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 3.2346938775510203) internal successors, (317), 97 states have internal predecessors, (317), 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 187 [2024-11-09 07:21:23,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:21:23,456 INFO L225 Difference]: With dead ends: 319 [2024-11-09 07:21:23,456 INFO L226 Difference]: Without dead ends: 191 [2024-11-09 07:21:23,457 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 623 GetRequests, 458 SyntacticMatches, 61 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6944 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=2204, Invalid=8926, Unknown=0, NotChecked=0, Total=11130 [2024-11-09 07:21:23,458 INFO L432 NwaCegarLoop]: 33 mSDtfsCounter, 1 mSDsluCounter, 341 mSDsCounter, 0 mSdLazyCounter, 1138 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 374 SdHoareTripleChecker+Invalid, 1139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2024-11-09 07:21:23,458 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 374 Invalid, 1139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1138 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2024-11-09 07:21:23,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2024-11-09 07:21:23,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 191. [2024-11-09 07:21:23,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 190 states have (on average 1.0157894736842106) internal successors, (193), 190 states have internal predecessors, (193), 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) [2024-11-09 07:21:23,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 193 transitions. [2024-11-09 07:21:23,487 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 193 transitions. Word has length 187 [2024-11-09 07:21:23,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:21:23,487 INFO L471 AbstractCegarLoop]: Abstraction has 191 states and 193 transitions. [2024-11-09 07:21:23,487 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 98 states have (on average 3.2346938775510203) internal successors, (317), 97 states have internal predecessors, (317), 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) [2024-11-09 07:21:23,488 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 193 transitions. [2024-11-09 07:21:23,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2024-11-09 07:21:23,489 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:21:23,489 INFO L215 NwaCegarLoop]: trace histogram [31, 31, 31, 31, 30, 30, 1, 1, 1, 1, 1] [2024-11-09 07:21:23,516 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2024-11-09 07:21:23,689 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:21:23,690 INFO L396 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:21:23,690 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:21:23,690 INFO L85 PathProgramCache]: Analyzing trace with hash 611161980, now seen corresponding path program 60 times [2024-11-09 07:21:23,690 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:21:23,690 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [637255705] [2024-11-09 07:21:23,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:21:23,690 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:21:23,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:21:25,057 INFO L134 CoverageAnalysis]: Checked inductivity of 2791 backedges. 900 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:21:25,057 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:21:25,057 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [637255705] [2024-11-09 07:21:25,057 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [637255705] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:21:25,057 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1299787569] [2024-11-09 07:21:25,057 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:21:25,057 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:21:25,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:21:25,059 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:21:25,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2024-11-09 07:21:25,327 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:21:25,327 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:21:25,331 INFO L255 TraceCheckSpWp]: Trace formula consists of 551 conjuncts, 68 conjuncts are in the unsatisfiable core [2024-11-09 07:21:25,334 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:21:25,622 INFO L134 CoverageAnalysis]: Checked inductivity of 2791 backedges. 961 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:21:25,622 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:21:26,955 INFO L134 CoverageAnalysis]: Checked inductivity of 2791 backedges. 961 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:21:26,955 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1299787569] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:21:26,955 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [171603304] [2024-11-09 07:21:26,968 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:21:26,968 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:21:26,969 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:21:26,969 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:21:26,969 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:21:27,118 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:21:27,742 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '59114#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:21:27,743 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:21:27,743 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:21:27,743 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 36 [2024-11-09 07:21:27,743 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538010790] [2024-11-09 07:21:27,743 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:21:27,744 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2024-11-09 07:21:27,744 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:21:27,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2024-11-09 07:21:27,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=1383, Unknown=0, NotChecked=0, Total=1980 [2024-11-09 07:21:27,746 INFO L87 Difference]: Start difference. First operand 191 states and 193 transitions. Second operand has 37 states, 37 states have (on average 5.243243243243243) internal successors, (194), 36 states have internal predecessors, (194), 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) [2024-11-09 07:21:28,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:21:28,698 INFO L93 Difference]: Finished difference Result 204 states and 206 transitions. [2024-11-09 07:21:28,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2024-11-09 07:21:28,699 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 5.243243243243243) internal successors, (194), 36 states have internal predecessors, (194), 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 189 [2024-11-09 07:21:28,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:21:28,700 INFO L225 Difference]: With dead ends: 204 [2024-11-09 07:21:28,700 INFO L226 Difference]: Without dead ends: 202 [2024-11-09 07:21:28,701 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 660 GetRequests, 524 SyntacticMatches, 62 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2496 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1713, Invalid=3987, Unknown=0, NotChecked=0, Total=5700 [2024-11-09 07:21:28,701 INFO L432 NwaCegarLoop]: 38 mSDtfsCounter, 14 mSDsluCounter, 256 mSDsCounter, 0 mSdLazyCounter, 338 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 339 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 338 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:21:28,702 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 294 Invalid, 339 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 338 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:21:28,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2024-11-09 07:21:28,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 195. [2024-11-09 07:21:28,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 194 states have (on average 1.0154639175257731) internal successors, (197), 194 states have internal predecessors, (197), 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) [2024-11-09 07:21:28,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 197 transitions. [2024-11-09 07:21:28,720 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 197 transitions. Word has length 189 [2024-11-09 07:21:28,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:21:28,721 INFO L471 AbstractCegarLoop]: Abstraction has 195 states and 197 transitions. [2024-11-09 07:21:28,721 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 5.243243243243243) internal successors, (194), 36 states have internal predecessors, (194), 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) [2024-11-09 07:21:28,721 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 197 transitions. [2024-11-09 07:21:28,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2024-11-09 07:21:28,723 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:21:28,723 INFO L215 NwaCegarLoop]: trace histogram [32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1] [2024-11-09 07:21:28,751 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Forceful destruction successful, exit code 0 [2024-11-09 07:21:28,923 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:21:28,924 INFO L396 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:21:28,924 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:21:28,924 INFO L85 PathProgramCache]: Analyzing trace with hash -2054995420, now seen corresponding path program 61 times [2024-11-09 07:21:28,924 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:21:28,924 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2031929511] [2024-11-09 07:21:28,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:21:28,924 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:21:28,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:21:31,808 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 1832 proven. 1082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:21:31,808 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:21:31,808 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2031929511] [2024-11-09 07:21:31,808 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2031929511] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:21:31,808 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1224366347] [2024-11-09 07:21:31,808 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:21:31,809 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:21:31,809 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:21:31,811 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:21:31,813 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2024-11-09 07:21:32,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:21:32,116 INFO L255 TraceCheckSpWp]: Trace formula consists of 562 conjuncts, 66 conjuncts are in the unsatisfiable core [2024-11-09 07:21:32,120 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:21:34,828 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 1953 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:21:34,829 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:21:37,150 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 1953 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:21:37,150 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1224366347] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:21:37,150 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [3270706] [2024-11-09 07:21:37,151 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:21:37,151 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:21:37,152 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:21:37,152 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:21:37,152 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:21:37,303 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:21:38,336 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '60965#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:21:38,336 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:21:38,336 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:21:38,336 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 100 [2024-11-09 07:21:38,337 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411238839] [2024-11-09 07:21:38,337 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:21:38,337 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2024-11-09 07:21:38,338 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:21:38,339 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2024-11-09 07:21:38,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2338, Invalid=9434, Unknown=0, NotChecked=0, Total=11772 [2024-11-09 07:21:38,340 INFO L87 Difference]: Start difference. First operand 195 states and 197 transitions. Second operand has 101 states, 101 states have (on average 3.237623762376238) internal successors, (327), 100 states have internal predecessors, (327), 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) [2024-11-09 07:21:39,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:21:39,242 INFO L93 Difference]: Finished difference Result 329 states and 333 transitions. [2024-11-09 07:21:39,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2024-11-09 07:21:39,243 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 3.237623762376238) internal successors, (327), 100 states have internal predecessors, (327), 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 193 [2024-11-09 07:21:39,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:21:39,244 INFO L225 Difference]: With dead ends: 329 [2024-11-09 07:21:39,244 INFO L226 Difference]: Without dead ends: 197 [2024-11-09 07:21:39,246 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 643 GetRequests, 473 SyntacticMatches, 63 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7360 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=2338, Invalid=9434, Unknown=0, NotChecked=0, Total=11772 [2024-11-09 07:21:39,246 INFO L432 NwaCegarLoop]: 34 mSDtfsCounter, 1 mSDsluCounter, 333 mSDsCounter, 0 mSdLazyCounter, 1126 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 367 SdHoareTripleChecker+Invalid, 1127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2024-11-09 07:21:39,247 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 367 Invalid, 1127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1126 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2024-11-09 07:21:39,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2024-11-09 07:21:39,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 197. [2024-11-09 07:21:39,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 196 states have (on average 1.0153061224489797) internal successors, (199), 196 states have internal predecessors, (199), 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) [2024-11-09 07:21:39,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 199 transitions. [2024-11-09 07:21:39,263 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 199 transitions. Word has length 193 [2024-11-09 07:21:39,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:21:39,263 INFO L471 AbstractCegarLoop]: Abstraction has 197 states and 199 transitions. [2024-11-09 07:21:39,263 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 3.237623762376238) internal successors, (327), 100 states have internal predecessors, (327), 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) [2024-11-09 07:21:39,263 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 199 transitions. [2024-11-09 07:21:39,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2024-11-09 07:21:39,264 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:21:39,264 INFO L215 NwaCegarLoop]: trace histogram [32, 32, 32, 32, 31, 31, 1, 1, 1, 1, 1] [2024-11-09 07:21:39,283 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2024-11-09 07:21:39,464 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable62 [2024-11-09 07:21:39,465 INFO L396 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:21:39,465 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:21:39,465 INFO L85 PathProgramCache]: Analyzing trace with hash 536500457, now seen corresponding path program 62 times [2024-11-09 07:21:39,466 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:21:39,466 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1710874703] [2024-11-09 07:21:39,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:21:39,466 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:21:39,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:21:41,089 INFO L134 CoverageAnalysis]: Checked inductivity of 2977 backedges. 961 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:21:41,089 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:21:41,089 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1710874703] [2024-11-09 07:21:41,090 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1710874703] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:21:41,090 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [126168031] [2024-11-09 07:21:41,090 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:21:41,090 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:21:41,090 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:21:41,092 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:21:41,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2024-11-09 07:21:41,465 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2024-11-09 07:21:41,465 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:21:41,470 INFO L255 TraceCheckSpWp]: Trace formula consists of 568 conjuncts, 70 conjuncts are in the unsatisfiable core [2024-11-09 07:21:41,475 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:21:41,790 INFO L134 CoverageAnalysis]: Checked inductivity of 2977 backedges. 1024 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:21:41,790 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:21:43,353 INFO L134 CoverageAnalysis]: Checked inductivity of 2977 backedges. 1024 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:21:43,354 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [126168031] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:21:43,354 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [956481738] [2024-11-09 07:21:43,355 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:21:43,355 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:21:43,355 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:21:43,356 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:21:43,356 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:21:43,504 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:21:44,143 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '62864#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:21:44,144 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:21:44,144 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:21:44,144 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 37 [2024-11-09 07:21:44,144 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35102302] [2024-11-09 07:21:44,144 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:21:44,145 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2024-11-09 07:21:44,145 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:21:44,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2024-11-09 07:21:44,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=631, Invalid=1439, Unknown=0, NotChecked=0, Total=2070 [2024-11-09 07:21:44,146 INFO L87 Difference]: Start difference. First operand 197 states and 199 transitions. Second operand has 38 states, 38 states have (on average 5.2631578947368425) internal successors, (200), 37 states have internal predecessors, (200), 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) [2024-11-09 07:21:45,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:21:45,116 INFO L93 Difference]: Finished difference Result 210 states and 212 transitions. [2024-11-09 07:21:45,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2024-11-09 07:21:45,117 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 5.2631578947368425) internal successors, (200), 37 states have internal predecessors, (200), 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 195 [2024-11-09 07:21:45,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:21:45,118 INFO L225 Difference]: With dead ends: 210 [2024-11-09 07:21:45,118 INFO L226 Difference]: Without dead ends: 208 [2024-11-09 07:21:45,119 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 681 GetRequests, 541 SyntacticMatches, 64 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2640 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1815, Invalid=4191, Unknown=0, NotChecked=0, Total=6006 [2024-11-09 07:21:45,120 INFO L432 NwaCegarLoop]: 39 mSDtfsCounter, 12 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 302 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 248 SdHoareTripleChecker+Invalid, 303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 07:21:45,121 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 248 Invalid, 303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 302 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 07:21:45,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2024-11-09 07:21:45,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 201. [2024-11-09 07:21:45,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 200 states have (on average 1.015) internal successors, (203), 200 states have internal predecessors, (203), 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) [2024-11-09 07:21:45,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 203 transitions. [2024-11-09 07:21:45,142 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 203 transitions. Word has length 195 [2024-11-09 07:21:45,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:21:45,142 INFO L471 AbstractCegarLoop]: Abstraction has 201 states and 203 transitions. [2024-11-09 07:21:45,143 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 5.2631578947368425) internal successors, (200), 37 states have internal predecessors, (200), 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) [2024-11-09 07:21:45,143 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 203 transitions. [2024-11-09 07:21:45,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2024-11-09 07:21:45,144 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:21:45,145 INFO L215 NwaCegarLoop]: trace histogram [33, 33, 32, 32, 32, 32, 1, 1, 1, 1, 1] [2024-11-09 07:21:45,174 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Ended with exit code 0 [2024-11-09 07:21:45,345 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable63 [2024-11-09 07:21:45,346 INFO L396 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:21:45,346 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:21:45,347 INFO L85 PathProgramCache]: Analyzing trace with hash -2134407919, now seen corresponding path program 63 times [2024-11-09 07:21:45,347 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:21:45,347 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1802451864] [2024-11-09 07:21:45,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:21:45,350 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:21:45,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:21:48,471 INFO L134 CoverageAnalysis]: Checked inductivity of 3104 backedges. 1955 proven. 1149 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:21:48,471 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:21:48,471 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1802451864] [2024-11-09 07:21:48,471 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1802451864] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:21:48,472 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1671247116] [2024-11-09 07:21:48,472 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:21:48,472 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:21:48,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:21:48,474 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:21:48,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2024-11-09 07:21:48,786 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:21:48,786 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:21:48,791 INFO L255 TraceCheckSpWp]: Trace formula consists of 579 conjuncts, 68 conjuncts are in the unsatisfiable core [2024-11-09 07:21:48,794 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:21:51,817 INFO L134 CoverageAnalysis]: Checked inductivity of 3104 backedges. 2080 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:21:51,817 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:21:54,277 INFO L134 CoverageAnalysis]: Checked inductivity of 3104 backedges. 2080 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:21:54,278 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1671247116] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:21:54,278 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [523275124] [2024-11-09 07:21:54,279 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:21:54,279 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:21:54,279 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:21:54,279 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:21:54,279 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:21:54,432 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:21:55,504 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '64772#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:21:55,505 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:21:55,505 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:21:55,505 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 103 [2024-11-09 07:21:55,505 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [105448640] [2024-11-09 07:21:55,505 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:21:55,506 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 104 states [2024-11-09 07:21:55,506 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:21:55,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2024-11-09 07:21:55,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2476, Invalid=9956, Unknown=0, NotChecked=0, Total=12432 [2024-11-09 07:21:55,509 INFO L87 Difference]: Start difference. First operand 201 states and 203 transitions. Second operand has 104 states, 104 states have (on average 3.2403846153846154) internal successors, (337), 103 states have internal predecessors, (337), 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) [2024-11-09 07:21:56,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:21:56,636 INFO L93 Difference]: Finished difference Result 339 states and 343 transitions. [2024-11-09 07:21:56,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2024-11-09 07:21:56,637 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 104 states have (on average 3.2403846153846154) internal successors, (337), 103 states have internal predecessors, (337), 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 199 [2024-11-09 07:21:56,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:21:56,638 INFO L225 Difference]: With dead ends: 339 [2024-11-09 07:21:56,639 INFO L226 Difference]: Without dead ends: 203 [2024-11-09 07:21:56,640 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 663 GetRequests, 488 SyntacticMatches, 65 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7788 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=2476, Invalid=9956, Unknown=0, NotChecked=0, Total=12432 [2024-11-09 07:21:56,641 INFO L432 NwaCegarLoop]: 35 mSDtfsCounter, 1 mSDsluCounter, 479 mSDsCounter, 0 mSdLazyCounter, 1537 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 514 SdHoareTripleChecker+Invalid, 1538 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1537 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2024-11-09 07:21:56,641 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 514 Invalid, 1538 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1537 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2024-11-09 07:21:56,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2024-11-09 07:21:56,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 203. [2024-11-09 07:21:56,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 202 states have (on average 1.0148514851485149) internal successors, (205), 202 states have internal predecessors, (205), 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) [2024-11-09 07:21:56,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 205 transitions. [2024-11-09 07:21:56,662 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 205 transitions. Word has length 199 [2024-11-09 07:21:56,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:21:56,663 INFO L471 AbstractCegarLoop]: Abstraction has 203 states and 205 transitions. [2024-11-09 07:21:56,663 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 104 states, 104 states have (on average 3.2403846153846154) internal successors, (337), 103 states have internal predecessors, (337), 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) [2024-11-09 07:21:56,663 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 205 transitions. [2024-11-09 07:21:56,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2024-11-09 07:21:56,665 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:21:56,665 INFO L215 NwaCegarLoop]: trace histogram [33, 33, 33, 33, 32, 32, 1, 1, 1, 1, 1] [2024-11-09 07:21:56,693 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2024-11-09 07:21:56,865 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:21:56,866 INFO L396 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:21:56,866 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:21:56,866 INFO L85 PathProgramCache]: Analyzing trace with hash -1539197930, now seen corresponding path program 64 times [2024-11-09 07:21:56,866 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:21:56,866 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1128569132] [2024-11-09 07:21:56,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:21:56,867 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:21:56,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:21:58,594 INFO L134 CoverageAnalysis]: Checked inductivity of 3169 backedges. 1024 proven. 2145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:21:58,594 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:21:58,594 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1128569132] [2024-11-09 07:21:58,594 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1128569132] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:21:58,594 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1531945454] [2024-11-09 07:21:58,594 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:21:58,595 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:21:58,595 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:21:58,596 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:21:58,598 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2024-11-09 07:21:58,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:21:58,907 INFO L255 TraceCheckSpWp]: Trace formula consists of 585 conjuncts, 69 conjuncts are in the unsatisfiable core [2024-11-09 07:21:58,910 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:21:59,228 INFO L134 CoverageAnalysis]: Checked inductivity of 3169 backedges. 1089 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:21:59,228 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:22:00,828 INFO L134 CoverageAnalysis]: Checked inductivity of 3169 backedges. 1089 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:22:00,828 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1531945454] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:22:00,828 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1123546812] [2024-11-09 07:22:00,829 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:22:00,830 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:22:00,830 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:22:00,830 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:22:00,830 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:22:01,004 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:22:01,630 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '66729#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:22:01,630 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:22:01,630 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:22:01,630 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 38 [2024-11-09 07:22:01,630 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [272978839] [2024-11-09 07:22:01,631 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:22:01,631 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2024-11-09 07:22:01,631 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:22:01,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2024-11-09 07:22:01,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=1496, Unknown=0, NotChecked=0, Total=2162 [2024-11-09 07:22:01,632 INFO L87 Difference]: Start difference. First operand 203 states and 205 transitions. Second operand has 39 states, 39 states have (on average 5.282051282051282) internal successors, (206), 38 states have internal predecessors, (206), 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) [2024-11-09 07:22:02,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:22:02,557 INFO L93 Difference]: Finished difference Result 216 states and 218 transitions. [2024-11-09 07:22:02,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2024-11-09 07:22:02,557 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 5.282051282051282) internal successors, (206), 38 states have internal predecessors, (206), 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 201 [2024-11-09 07:22:02,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:22:02,559 INFO L225 Difference]: With dead ends: 216 [2024-11-09 07:22:02,559 INFO L226 Difference]: Without dead ends: 214 [2024-11-09 07:22:02,560 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 702 GetRequests, 557 SyntacticMatches, 67 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2821 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1920, Invalid=4400, Unknown=0, NotChecked=0, Total=6320 [2024-11-09 07:22:02,560 INFO L432 NwaCegarLoop]: 40 mSDtfsCounter, 12 mSDsluCounter, 279 mSDsCounter, 0 mSdLazyCounter, 369 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 319 SdHoareTripleChecker+Invalid, 370 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:22:02,561 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 319 Invalid, 370 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 369 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:22:02,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2024-11-09 07:22:02,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 207. [2024-11-09 07:22:02,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 206 states have (on average 1.0145631067961165) internal successors, (209), 206 states have internal predecessors, (209), 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) [2024-11-09 07:22:02,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 209 transitions. [2024-11-09 07:22:02,586 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 209 transitions. Word has length 201 [2024-11-09 07:22:02,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:22:02,587 INFO L471 AbstractCegarLoop]: Abstraction has 207 states and 209 transitions. [2024-11-09 07:22:02,587 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 5.282051282051282) internal successors, (206), 38 states have internal predecessors, (206), 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) [2024-11-09 07:22:02,587 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 209 transitions. [2024-11-09 07:22:02,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2024-11-09 07:22:02,588 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:22:02,588 INFO L215 NwaCegarLoop]: trace histogram [34, 34, 33, 33, 33, 33, 1, 1, 1, 1, 1] [2024-11-09 07:22:02,612 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Forceful destruction successful, exit code 0 [2024-11-09 07:22:02,789 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:22:02,790 INFO L396 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:22:02,790 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:22:02,791 INFO L85 PathProgramCache]: Analyzing trace with hash -1906081346, now seen corresponding path program 65 times [2024-11-09 07:22:02,791 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:22:02,791 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1312350687] [2024-11-09 07:22:02,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:22:02,791 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:22:02,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:22:06,523 INFO L134 CoverageAnalysis]: Checked inductivity of 3300 backedges. 2082 proven. 1218 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:22:06,523 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:22:06,523 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1312350687] [2024-11-09 07:22:06,523 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1312350687] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:22:06,523 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [769308186] [2024-11-09 07:22:06,523 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:22:06,524 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:22:06,524 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:22:06,525 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:22:06,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2024-11-09 07:22:06,926 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2024-11-09 07:22:06,927 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:22:06,931 INFO L255 TraceCheckSpWp]: Trace formula consists of 596 conjuncts, 70 conjuncts are in the unsatisfiable core [2024-11-09 07:22:06,934 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:22:10,114 INFO L134 CoverageAnalysis]: Checked inductivity of 3300 backedges. 2211 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:22:10,114 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:22:12,465 INFO L134 CoverageAnalysis]: Checked inductivity of 3300 backedges. 2211 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:22:12,466 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [769308186] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:22:12,466 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [853135484] [2024-11-09 07:22:12,467 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:22:12,467 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:22:12,467 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:22:12,467 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:22:12,467 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:22:12,651 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:22:13,738 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '68694#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:22:13,739 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:22:13,739 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:22:13,739 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 106 [2024-11-09 07:22:13,739 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069502524] [2024-11-09 07:22:13,739 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:22:13,740 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2024-11-09 07:22:13,740 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:22:13,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2024-11-09 07:22:13,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2618, Invalid=10492, Unknown=0, NotChecked=0, Total=13110 [2024-11-09 07:22:13,742 INFO L87 Difference]: Start difference. First operand 207 states and 209 transitions. Second operand has 107 states, 107 states have (on average 3.2429906542056073) internal successors, (347), 106 states have internal predecessors, (347), 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) [2024-11-09 07:22:14,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:22:14,921 INFO L93 Difference]: Finished difference Result 349 states and 353 transitions. [2024-11-09 07:22:14,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2024-11-09 07:22:14,922 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 3.2429906542056073) internal successors, (347), 106 states have internal predecessors, (347), 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 205 [2024-11-09 07:22:14,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:22:14,923 INFO L225 Difference]: With dead ends: 349 [2024-11-09 07:22:14,923 INFO L226 Difference]: Without dead ends: 209 [2024-11-09 07:22:14,924 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 683 GetRequests, 503 SyntacticMatches, 67 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8228 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=2618, Invalid=10492, Unknown=0, NotChecked=0, Total=13110 [2024-11-09 07:22:14,924 INFO L432 NwaCegarLoop]: 36 mSDtfsCounter, 1 mSDsluCounter, 440 mSDsCounter, 0 mSdLazyCounter, 1448 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 476 SdHoareTripleChecker+Invalid, 1449 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1448 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2024-11-09 07:22:14,925 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 476 Invalid, 1449 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1448 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2024-11-09 07:22:14,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2024-11-09 07:22:14,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 209. [2024-11-09 07:22:14,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 208 states have (on average 1.0144230769230769) internal successors, (211), 208 states have internal predecessors, (211), 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) [2024-11-09 07:22:14,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 211 transitions. [2024-11-09 07:22:14,947 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 211 transitions. Word has length 205 [2024-11-09 07:22:14,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:22:14,947 INFO L471 AbstractCegarLoop]: Abstraction has 209 states and 211 transitions. [2024-11-09 07:22:14,948 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 3.2429906542056073) internal successors, (347), 106 states have internal predecessors, (347), 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) [2024-11-09 07:22:14,948 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 211 transitions. [2024-11-09 07:22:14,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2024-11-09 07:22:14,949 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:22:14,950 INFO L215 NwaCegarLoop]: trace histogram [34, 34, 34, 34, 33, 33, 1, 1, 1, 1, 1] [2024-11-09 07:22:14,969 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Forceful destruction successful, exit code 0 [2024-11-09 07:22:15,152 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2024-11-09 07:22:15,152 INFO L396 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:22:15,153 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:22:15,153 INFO L85 PathProgramCache]: Analyzing trace with hash -71460605, now seen corresponding path program 66 times [2024-11-09 07:22:15,153 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:22:15,153 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2121063867] [2024-11-09 07:22:15,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:22:15,153 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:22:15,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:22:16,954 INFO L134 CoverageAnalysis]: Checked inductivity of 3367 backedges. 1089 proven. 2278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:22:16,954 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:22:16,954 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2121063867] [2024-11-09 07:22:16,954 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2121063867] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:22:16,955 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [405499468] [2024-11-09 07:22:16,955 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:22:16,955 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:22:16,955 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:22:16,956 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:22:16,957 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2024-11-09 07:22:17,308 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:22:17,308 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:22:17,314 INFO L255 TraceCheckSpWp]: Trace formula consists of 602 conjuncts, 74 conjuncts are in the unsatisfiable core [2024-11-09 07:22:17,319 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:22:17,749 INFO L134 CoverageAnalysis]: Checked inductivity of 3367 backedges. 1156 proven. 2211 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:22:17,750 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:22:19,425 INFO L134 CoverageAnalysis]: Checked inductivity of 3367 backedges. 1156 proven. 2211 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:22:19,425 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [405499468] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:22:19,426 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1772458262] [2024-11-09 07:22:19,426 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:22:19,427 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:22:19,427 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:22:19,427 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:22:19,427 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:22:19,568 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:22:20,228 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '70709#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:22:20,228 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:22:20,229 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:22:20,229 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 39 [2024-11-09 07:22:20,229 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891461466] [2024-11-09 07:22:20,229 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:22:20,230 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2024-11-09 07:22:20,230 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:22:20,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2024-11-09 07:22:20,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=702, Invalid=1554, Unknown=0, NotChecked=0, Total=2256 [2024-11-09 07:22:20,231 INFO L87 Difference]: Start difference. First operand 209 states and 211 transitions. Second operand has 40 states, 40 states have (on average 5.3) internal successors, (212), 39 states have internal predecessors, (212), 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) [2024-11-09 07:22:21,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:22:21,299 INFO L93 Difference]: Finished difference Result 222 states and 224 transitions. [2024-11-09 07:22:21,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2024-11-09 07:22:21,299 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 5.3) internal successors, (212), 39 states have internal predecessors, (212), 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 207 [2024-11-09 07:22:21,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:22:21,300 INFO L225 Difference]: With dead ends: 222 [2024-11-09 07:22:21,301 INFO L226 Difference]: Without dead ends: 220 [2024-11-09 07:22:21,301 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 723 GetRequests, 575 SyntacticMatches, 68 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2940 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=2028, Invalid=4614, Unknown=0, NotChecked=0, Total=6642 [2024-11-09 07:22:21,302 INFO L432 NwaCegarLoop]: 41 mSDtfsCounter, 12 mSDsluCounter, 238 mSDsCounter, 0 mSdLazyCounter, 335 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 336 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 335 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:22:21,302 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 279 Invalid, 336 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 335 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:22:21,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2024-11-09 07:22:21,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 213. [2024-11-09 07:22:21,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 212 states have (on average 1.0141509433962264) internal successors, (215), 212 states have internal predecessors, (215), 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) [2024-11-09 07:22:21,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 215 transitions. [2024-11-09 07:22:21,317 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 215 transitions. Word has length 207 [2024-11-09 07:22:21,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:22:21,317 INFO L471 AbstractCegarLoop]: Abstraction has 213 states and 215 transitions. [2024-11-09 07:22:21,317 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 5.3) internal successors, (212), 39 states have internal predecessors, (212), 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) [2024-11-09 07:22:21,317 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 215 transitions. [2024-11-09 07:22:21,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 212 [2024-11-09 07:22:21,318 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:22:21,318 INFO L215 NwaCegarLoop]: trace histogram [35, 35, 34, 34, 34, 34, 1, 1, 1, 1, 1] [2024-11-09 07:22:21,337 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Ended with exit code 0 [2024-11-09 07:22:21,519 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2024-11-09 07:22:21,519 INFO L396 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:22:21,519 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:22:21,519 INFO L85 PathProgramCache]: Analyzing trace with hash 1247356971, now seen corresponding path program 67 times [2024-11-09 07:22:21,519 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:22:21,520 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1769504875] [2024-11-09 07:22:21,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:22:21,520 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:22:21,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:22:25,045 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 2213 proven. 1289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:22:25,045 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:22:25,045 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1769504875] [2024-11-09 07:22:25,045 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1769504875] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:22:25,045 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1276023884] [2024-11-09 07:22:25,046 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:22:25,046 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:22:25,046 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:22:25,047 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:22:25,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2024-11-09 07:22:25,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:22:25,375 INFO L255 TraceCheckSpWp]: Trace formula consists of 613 conjuncts, 72 conjuncts are in the unsatisfiable core [2024-11-09 07:22:25,377 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:22:28,879 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 2346 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:22:28,879 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:22:31,426 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 2346 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:22:31,426 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1276023884] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:22:31,426 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1091102758] [2024-11-09 07:22:31,427 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:22:31,428 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:22:31,428 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:22:31,428 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:22:31,428 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:22:31,591 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:22:32,657 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '72731#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:22:32,657 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:22:32,657 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:22:32,657 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 109 [2024-11-09 07:22:32,657 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2086740605] [2024-11-09 07:22:32,657 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:22:32,658 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 110 states [2024-11-09 07:22:32,658 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:22:32,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2024-11-09 07:22:32,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2764, Invalid=11042, Unknown=0, NotChecked=0, Total=13806 [2024-11-09 07:22:32,660 INFO L87 Difference]: Start difference. First operand 213 states and 215 transitions. Second operand has 110 states, 110 states have (on average 3.2454545454545456) internal successors, (357), 109 states have internal predecessors, (357), 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) [2024-11-09 07:22:33,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:22:33,579 INFO L93 Difference]: Finished difference Result 359 states and 363 transitions. [2024-11-09 07:22:33,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2024-11-09 07:22:33,580 INFO L78 Accepts]: Start accepts. Automaton has has 110 states, 110 states have (on average 3.2454545454545456) internal successors, (357), 109 states have internal predecessors, (357), 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 211 [2024-11-09 07:22:33,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:22:33,581 INFO L225 Difference]: With dead ends: 359 [2024-11-09 07:22:33,581 INFO L226 Difference]: Without dead ends: 215 [2024-11-09 07:22:33,582 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 703 GetRequests, 518 SyntacticMatches, 69 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8680 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=2764, Invalid=11042, Unknown=0, NotChecked=0, Total=13806 [2024-11-09 07:22:33,583 INFO L432 NwaCegarLoop]: 37 mSDtfsCounter, 1 mSDsluCounter, 343 mSDsCounter, 0 mSdLazyCounter, 1170 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 380 SdHoareTripleChecker+Invalid, 1171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1170 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2024-11-09 07:22:33,583 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 380 Invalid, 1171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1170 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2024-11-09 07:22:33,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2024-11-09 07:22:33,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 215. [2024-11-09 07:22:33,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 214 states have (on average 1.014018691588785) internal successors, (217), 214 states have internal predecessors, (217), 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) [2024-11-09 07:22:33,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 217 transitions. [2024-11-09 07:22:33,605 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 217 transitions. Word has length 211 [2024-11-09 07:22:33,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:22:33,606 INFO L471 AbstractCegarLoop]: Abstraction has 215 states and 217 transitions. [2024-11-09 07:22:33,606 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 110 states, 110 states have (on average 3.2454545454545456) internal successors, (357), 109 states have internal predecessors, (357), 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) [2024-11-09 07:22:33,606 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 217 transitions. [2024-11-09 07:22:33,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2024-11-09 07:22:33,607 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:22:33,608 INFO L215 NwaCegarLoop]: trace histogram [35, 35, 35, 35, 34, 34, 1, 1, 1, 1, 1] [2024-11-09 07:22:33,630 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Forceful destruction successful, exit code 0 [2024-11-09 07:22:33,808 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2024-11-09 07:22:33,808 INFO L396 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:22:33,809 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:22:33,809 INFO L85 PathProgramCache]: Analyzing trace with hash -1114376272, now seen corresponding path program 68 times [2024-11-09 07:22:33,809 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:22:33,809 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [501953911] [2024-11-09 07:22:33,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:22:33,809 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:22:33,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:22:35,830 INFO L134 CoverageAnalysis]: Checked inductivity of 3571 backedges. 1156 proven. 2415 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:22:35,830 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:22:35,830 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [501953911] [2024-11-09 07:22:35,830 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [501953911] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:22:35,830 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1048069337] [2024-11-09 07:22:35,830 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:22:35,830 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:22:35,831 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:22:35,832 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:22:35,833 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2024-11-09 07:22:36,244 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2024-11-09 07:22:36,244 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:22:36,248 INFO L255 TraceCheckSpWp]: Trace formula consists of 619 conjuncts, 76 conjuncts are in the unsatisfiable core [2024-11-09 07:22:36,251 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:22:36,619 INFO L134 CoverageAnalysis]: Checked inductivity of 3571 backedges. 1225 proven. 2346 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:22:36,619 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:22:38,512 INFO L134 CoverageAnalysis]: Checked inductivity of 3571 backedges. 1225 proven. 2346 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:22:38,513 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1048069337] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:22:38,513 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2080546313] [2024-11-09 07:22:38,514 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:22:38,514 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:22:38,514 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:22:38,514 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:22:38,514 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:22:38,677 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:22:39,306 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '74804#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:22:39,306 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:22:39,306 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:22:39,307 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 40 [2024-11-09 07:22:39,307 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1227150867] [2024-11-09 07:22:39,307 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:22:39,307 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2024-11-09 07:22:39,307 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:22:39,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2024-11-09 07:22:39,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=739, Invalid=1613, Unknown=0, NotChecked=0, Total=2352 [2024-11-09 07:22:39,308 INFO L87 Difference]: Start difference. First operand 215 states and 217 transitions. Second operand has 41 states, 41 states have (on average 5.317073170731708) internal successors, (218), 40 states have internal predecessors, (218), 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) [2024-11-09 07:22:40,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:22:40,418 INFO L93 Difference]: Finished difference Result 228 states and 230 transitions. [2024-11-09 07:22:40,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2024-11-09 07:22:40,418 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 5.317073170731708) internal successors, (218), 40 states have internal predecessors, (218), 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 213 [2024-11-09 07:22:40,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:22:40,420 INFO L225 Difference]: With dead ends: 228 [2024-11-09 07:22:40,420 INFO L226 Difference]: Without dead ends: 226 [2024-11-09 07:22:40,421 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 744 GetRequests, 592 SyntacticMatches, 70 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3096 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=2139, Invalid=4833, Unknown=0, NotChecked=0, Total=6972 [2024-11-09 07:22:40,421 INFO L432 NwaCegarLoop]: 42 mSDtfsCounter, 13 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 342 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 290 SdHoareTripleChecker+Invalid, 343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 342 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:22:40,421 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 290 Invalid, 343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 342 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:22:40,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2024-11-09 07:22:40,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 219. [2024-11-09 07:22:40,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 218 states have (on average 1.0137614678899083) internal successors, (221), 218 states have internal predecessors, (221), 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) [2024-11-09 07:22:40,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 221 transitions. [2024-11-09 07:22:40,445 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 221 transitions. Word has length 213 [2024-11-09 07:22:40,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:22:40,446 INFO L471 AbstractCegarLoop]: Abstraction has 219 states and 221 transitions. [2024-11-09 07:22:40,446 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 5.317073170731708) internal successors, (218), 40 states have internal predecessors, (218), 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) [2024-11-09 07:22:40,446 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 221 transitions. [2024-11-09 07:22:40,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 218 [2024-11-09 07:22:40,448 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:22:40,448 INFO L215 NwaCegarLoop]: trace histogram [36, 36, 35, 35, 35, 35, 1, 1, 1, 1, 1] [2024-11-09 07:22:40,471 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Forceful destruction successful, exit code 0 [2024-11-09 07:22:40,648 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2024-11-09 07:22:40,649 INFO L396 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:22:40,649 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:22:40,649 INFO L85 PathProgramCache]: Analyzing trace with hash 1733716056, now seen corresponding path program 69 times [2024-11-09 07:22:40,650 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:22:40,650 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205863764] [2024-11-09 07:22:40,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:22:40,650 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:22:40,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:22:44,127 INFO L134 CoverageAnalysis]: Checked inductivity of 3710 backedges. 2348 proven. 1362 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:22:44,128 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:22:44,128 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [205863764] [2024-11-09 07:22:44,128 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [205863764] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:22:44,128 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1127984892] [2024-11-09 07:22:44,128 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:22:44,128 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:22:44,128 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:22:44,130 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:22:44,131 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2024-11-09 07:22:44,473 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:22:44,474 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:22:44,479 INFO L255 TraceCheckSpWp]: Trace formula consists of 630 conjuncts, 74 conjuncts are in the unsatisfiable core [2024-11-09 07:22:44,482 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:22:48,022 INFO L134 CoverageAnalysis]: Checked inductivity of 3710 backedges. 2485 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:22:48,022 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:22:50,698 INFO L134 CoverageAnalysis]: Checked inductivity of 3710 backedges. 2485 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:22:50,699 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1127984892] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:22:50,699 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1082648455] [2024-11-09 07:22:50,700 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:22:50,700 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:22:50,700 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:22:50,700 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:22:50,700 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:22:50,859 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:22:52,008 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '76883#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:22:52,008 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:22:52,008 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:22:52,009 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74] total 112 [2024-11-09 07:22:52,009 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991331804] [2024-11-09 07:22:52,009 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:22:52,009 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2024-11-09 07:22:52,009 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:22:52,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2024-11-09 07:22:52,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2914, Invalid=11606, Unknown=0, NotChecked=0, Total=14520 [2024-11-09 07:22:52,012 INFO L87 Difference]: Start difference. First operand 219 states and 221 transitions. Second operand has 113 states, 113 states have (on average 3.247787610619469) internal successors, (367), 112 states have internal predecessors, (367), 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) [2024-11-09 07:22:53,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:22:53,106 INFO L93 Difference]: Finished difference Result 369 states and 373 transitions. [2024-11-09 07:22:53,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2024-11-09 07:22:53,107 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 113 states have (on average 3.247787610619469) internal successors, (367), 112 states have internal predecessors, (367), 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 217 [2024-11-09 07:22:53,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:22:53,108 INFO L225 Difference]: With dead ends: 369 [2024-11-09 07:22:53,108 INFO L226 Difference]: Without dead ends: 221 [2024-11-09 07:22:53,109 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 723 GetRequests, 533 SyntacticMatches, 71 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9144 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=2914, Invalid=11606, Unknown=0, NotChecked=0, Total=14520 [2024-11-09 07:22:53,109 INFO L432 NwaCegarLoop]: 38 mSDtfsCounter, 1 mSDsluCounter, 400 mSDsCounter, 0 mSdLazyCounter, 1334 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 438 SdHoareTripleChecker+Invalid, 1335 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1334 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2024-11-09 07:22:53,109 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 438 Invalid, 1335 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1334 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2024-11-09 07:22:53,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2024-11-09 07:22:53,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 221. [2024-11-09 07:22:53,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 221 states, 220 states have (on average 1.0136363636363637) internal successors, (223), 220 states have internal predecessors, (223), 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) [2024-11-09 07:22:53,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 223 transitions. [2024-11-09 07:22:53,122 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 223 transitions. Word has length 217 [2024-11-09 07:22:53,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:22:53,123 INFO L471 AbstractCegarLoop]: Abstraction has 221 states and 223 transitions. [2024-11-09 07:22:53,123 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 113 states have (on average 3.247787610619469) internal successors, (367), 112 states have internal predecessors, (367), 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) [2024-11-09 07:22:53,123 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 223 transitions. [2024-11-09 07:22:53,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2024-11-09 07:22:53,124 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:22:53,125 INFO L215 NwaCegarLoop]: trace histogram [36, 36, 36, 36, 35, 35, 1, 1, 1, 1, 1] [2024-11-09 07:22:53,155 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Ended with exit code 0 [2024-11-09 07:22:53,327 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:22:53,327 INFO L396 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:22:53,328 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:22:53,328 INFO L85 PathProgramCache]: Analyzing trace with hash -1399406563, now seen corresponding path program 70 times [2024-11-09 07:22:53,328 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:22:53,328 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [155664067] [2024-11-09 07:22:53,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:22:53,329 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:22:53,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:22:55,614 INFO L134 CoverageAnalysis]: Checked inductivity of 3781 backedges. 1225 proven. 2556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:22:55,614 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:22:55,614 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [155664067] [2024-11-09 07:22:55,614 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [155664067] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:22:55,614 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [885048073] [2024-11-09 07:22:55,614 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:22:55,615 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:22:55,615 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:22:55,616 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:22:55,617 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Waiting until timeout for monitored process [2024-11-09 07:22:56,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:22:56,007 INFO L255 TraceCheckSpWp]: Trace formula consists of 636 conjuncts, 75 conjuncts are in the unsatisfiable core [2024-11-09 07:22:56,010 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:22:56,349 INFO L134 CoverageAnalysis]: Checked inductivity of 3781 backedges. 1296 proven. 2485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:22:56,349 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:22:58,182 INFO L134 CoverageAnalysis]: Checked inductivity of 3781 backedges. 1296 proven. 2485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:22:58,182 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [885048073] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:22:58,182 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [270802398] [2024-11-09 07:22:58,183 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:22:58,183 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:22:58,183 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:22:58,183 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:22:58,183 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:22:58,367 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:22:59,083 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '79014#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:22:59,083 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:22:59,083 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:22:59,083 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 41 [2024-11-09 07:22:59,083 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863750121] [2024-11-09 07:22:59,084 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:22:59,084 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2024-11-09 07:22:59,084 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:22:59,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2024-11-09 07:22:59,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=777, Invalid=1673, Unknown=0, NotChecked=0, Total=2450 [2024-11-09 07:22:59,085 INFO L87 Difference]: Start difference. First operand 221 states and 223 transitions. Second operand has 42 states, 42 states have (on average 5.333333333333333) internal successors, (224), 41 states have internal predecessors, (224), 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) [2024-11-09 07:23:00,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:23:00,245 INFO L93 Difference]: Finished difference Result 234 states and 236 transitions. [2024-11-09 07:23:00,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2024-11-09 07:23:00,246 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 5.333333333333333) internal successors, (224), 41 states have internal predecessors, (224), 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 219 [2024-11-09 07:23:00,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:23:00,247 INFO L225 Difference]: With dead ends: 234 [2024-11-09 07:23:00,247 INFO L226 Difference]: Without dead ends: 232 [2024-11-09 07:23:00,248 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 765 GetRequests, 608 SyntacticMatches, 73 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3292 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=2253, Invalid=5057, Unknown=0, NotChecked=0, Total=7310 [2024-11-09 07:23:00,248 INFO L432 NwaCegarLoop]: 43 mSDtfsCounter, 13 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 378 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 328 SdHoareTripleChecker+Invalid, 379 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 378 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:23:00,249 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 328 Invalid, 379 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 378 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:23:00,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2024-11-09 07:23:00,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 225. [2024-11-09 07:23:00,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 224 states have (on average 1.0133928571428572) internal successors, (227), 224 states have internal predecessors, (227), 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) [2024-11-09 07:23:00,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 227 transitions. [2024-11-09 07:23:00,268 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 227 transitions. Word has length 219 [2024-11-09 07:23:00,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:23:00,268 INFO L471 AbstractCegarLoop]: Abstraction has 225 states and 227 transitions. [2024-11-09 07:23:00,268 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 5.333333333333333) internal successors, (224), 41 states have internal predecessors, (224), 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) [2024-11-09 07:23:00,268 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 227 transitions. [2024-11-09 07:23:00,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 224 [2024-11-09 07:23:00,269 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:23:00,269 INFO L215 NwaCegarLoop]: trace histogram [37, 37, 36, 36, 36, 36, 1, 1, 1, 1, 1] [2024-11-09 07:23:00,292 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Forceful destruction successful, exit code 0 [2024-11-09 07:23:00,470 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:23:00,470 INFO L396 AbstractCegarLoop]: === Iteration 73 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:23:00,471 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:23:00,471 INFO L85 PathProgramCache]: Analyzing trace with hash 229978693, now seen corresponding path program 71 times [2024-11-09 07:23:00,471 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:23:00,471 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [199135109] [2024-11-09 07:23:00,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:23:00,471 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:23:00,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:23:04,339 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2487 proven. 1437 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:23:04,340 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:23:04,340 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [199135109] [2024-11-09 07:23:04,340 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [199135109] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:23:04,340 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [747964554] [2024-11-09 07:23:04,340 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:23:04,340 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:23:04,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:23:04,342 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:23:04,343 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2024-11-09 07:23:04,797 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 37 check-sat command(s) [2024-11-09 07:23:04,797 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:23:04,802 INFO L255 TraceCheckSpWp]: Trace formula consists of 647 conjuncts, 76 conjuncts are in the unsatisfiable core [2024-11-09 07:23:04,806 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:23:08,627 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2628 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:23:08,627 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:23:11,424 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2628 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:23:11,424 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [747964554] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:23:11,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1033688984] [2024-11-09 07:23:11,426 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:23:11,426 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:23:11,426 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:23:11,426 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:23:11,426 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:23:11,582 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:23:12,849 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '81150#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:23:12,849 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:23:12,849 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:23:12,850 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 115 [2024-11-09 07:23:12,850 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349718973] [2024-11-09 07:23:12,850 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:23:12,851 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 116 states [2024-11-09 07:23:12,851 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:23:12,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2024-11-09 07:23:12,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3068, Invalid=12184, Unknown=0, NotChecked=0, Total=15252 [2024-11-09 07:23:12,855 INFO L87 Difference]: Start difference. First operand 225 states and 227 transitions. Second operand has 116 states, 116 states have (on average 3.25) internal successors, (377), 115 states have internal predecessors, (377), 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) [2024-11-09 07:23:13,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:23:13,884 INFO L93 Difference]: Finished difference Result 379 states and 383 transitions. [2024-11-09 07:23:13,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2024-11-09 07:23:13,885 INFO L78 Accepts]: Start accepts. Automaton has has 116 states, 116 states have (on average 3.25) internal successors, (377), 115 states have internal predecessors, (377), 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 223 [2024-11-09 07:23:13,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:23:13,886 INFO L225 Difference]: With dead ends: 379 [2024-11-09 07:23:13,886 INFO L226 Difference]: Without dead ends: 227 [2024-11-09 07:23:13,887 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 743 GetRequests, 548 SyntacticMatches, 73 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9620 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=3068, Invalid=12184, Unknown=0, NotChecked=0, Total=15252 [2024-11-09 07:23:13,888 INFO L432 NwaCegarLoop]: 39 mSDtfsCounter, 1 mSDsluCounter, 298 mSDsCounter, 0 mSdLazyCounter, 1059 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 337 SdHoareTripleChecker+Invalid, 1060 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1059 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2024-11-09 07:23:13,888 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 337 Invalid, 1060 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1059 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2024-11-09 07:23:13,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2024-11-09 07:23:13,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 227. [2024-11-09 07:23:13,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 226 states have (on average 1.0132743362831858) internal successors, (229), 226 states have internal predecessors, (229), 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) [2024-11-09 07:23:13,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 229 transitions. [2024-11-09 07:23:13,915 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 229 transitions. Word has length 223 [2024-11-09 07:23:13,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:23:13,916 INFO L471 AbstractCegarLoop]: Abstraction has 227 states and 229 transitions. [2024-11-09 07:23:13,916 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 116 states, 116 states have (on average 3.25) internal successors, (377), 115 states have internal predecessors, (377), 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) [2024-11-09 07:23:13,916 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 229 transitions. [2024-11-09 07:23:13,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2024-11-09 07:23:13,918 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:23:13,918 INFO L215 NwaCegarLoop]: trace histogram [37, 37, 37, 37, 36, 36, 1, 1, 1, 1, 1] [2024-11-09 07:23:13,944 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Forceful destruction successful, exit code 0 [2024-11-09 07:23:14,119 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:23:14,119 INFO L396 AbstractCegarLoop]: === Iteration 74 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:23:14,119 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:23:14,119 INFO L85 PathProgramCache]: Analyzing trace with hash 1447289418, now seen corresponding path program 72 times [2024-11-09 07:23:14,119 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:23:14,120 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [364803147] [2024-11-09 07:23:14,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:23:14,120 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:23:14,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:23:16,343 INFO L134 CoverageAnalysis]: Checked inductivity of 3997 backedges. 1296 proven. 2701 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:23:16,343 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:23:16,344 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [364803147] [2024-11-09 07:23:16,344 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [364803147] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:23:16,344 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1151562542] [2024-11-09 07:23:16,344 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:23:16,344 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:23:16,344 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:23:16,345 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:23:16,346 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2024-11-09 07:23:16,718 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:23:16,718 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:23:16,724 INFO L255 TraceCheckSpWp]: Trace formula consists of 653 conjuncts, 80 conjuncts are in the unsatisfiable core [2024-11-09 07:23:16,727 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:23:17,183 INFO L134 CoverageAnalysis]: Checked inductivity of 3997 backedges. 1369 proven. 2628 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:23:17,183 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:23:19,137 INFO L134 CoverageAnalysis]: Checked inductivity of 3997 backedges. 1369 proven. 2628 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:23:19,138 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1151562542] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:23:19,138 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1490899934] [2024-11-09 07:23:19,139 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:23:19,139 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:23:19,139 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:23:19,139 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:23:19,139 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:23:19,331 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:23:19,985 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '83339#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:23:19,986 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:23:19,986 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:23:19,986 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 42 [2024-11-09 07:23:19,986 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040605285] [2024-11-09 07:23:19,986 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:23:19,987 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2024-11-09 07:23:19,987 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:23:19,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2024-11-09 07:23:19,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=816, Invalid=1734, Unknown=0, NotChecked=0, Total=2550 [2024-11-09 07:23:19,988 INFO L87 Difference]: Start difference. First operand 227 states and 229 transitions. Second operand has 43 states, 43 states have (on average 5.348837209302325) internal successors, (230), 42 states have internal predecessors, (230), 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) [2024-11-09 07:23:21,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:23:21,151 INFO L93 Difference]: Finished difference Result 240 states and 242 transitions. [2024-11-09 07:23:21,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2024-11-09 07:23:21,152 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 5.348837209302325) internal successors, (230), 42 states have internal predecessors, (230), 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 225 [2024-11-09 07:23:21,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:23:21,154 INFO L225 Difference]: With dead ends: 240 [2024-11-09 07:23:21,154 INFO L226 Difference]: Without dead ends: 238 [2024-11-09 07:23:21,155 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 786 GetRequests, 626 SyntacticMatches, 74 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3420 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=2370, Invalid=5286, Unknown=0, NotChecked=0, Total=7656 [2024-11-09 07:23:21,155 INFO L432 NwaCegarLoop]: 44 mSDtfsCounter, 11 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 366 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 306 SdHoareTripleChecker+Invalid, 367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 366 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:23:21,155 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 306 Invalid, 367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 366 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:23:21,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2024-11-09 07:23:21,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 231. [2024-11-09 07:23:21,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 231 states, 230 states have (on average 1.0130434782608695) internal successors, (233), 230 states have internal predecessors, (233), 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) [2024-11-09 07:23:21,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 233 transitions. [2024-11-09 07:23:21,171 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 233 transitions. Word has length 225 [2024-11-09 07:23:21,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:23:21,172 INFO L471 AbstractCegarLoop]: Abstraction has 231 states and 233 transitions. [2024-11-09 07:23:21,172 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 5.348837209302325) internal successors, (230), 42 states have internal predecessors, (230), 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) [2024-11-09 07:23:21,172 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 233 transitions. [2024-11-09 07:23:21,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2024-11-09 07:23:21,174 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:23:21,174 INFO L215 NwaCegarLoop]: trace histogram [38, 38, 37, 37, 37, 37, 1, 1, 1, 1, 1] [2024-11-09 07:23:21,206 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Forceful destruction successful, exit code 0 [2024-11-09 07:23:21,374 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:23:21,375 INFO L396 AbstractCegarLoop]: === Iteration 75 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:23:21,375 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:23:21,375 INFO L85 PathProgramCache]: Analyzing trace with hash -92572174, now seen corresponding path program 73 times [2024-11-09 07:23:21,375 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:23:21,375 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1929667256] [2024-11-09 07:23:21,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:23:21,376 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:23:21,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:23:25,490 INFO L134 CoverageAnalysis]: Checked inductivity of 4144 backedges. 2630 proven. 1514 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:23:25,490 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:23:25,490 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1929667256] [2024-11-09 07:23:25,490 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1929667256] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:23:25,490 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2057637641] [2024-11-09 07:23:25,490 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:23:25,490 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:23:25,491 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:23:25,492 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:23:25,493 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Waiting until timeout for monitored process [2024-11-09 07:23:25,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:23:25,873 INFO L255 TraceCheckSpWp]: Trace formula consists of 664 conjuncts, 78 conjuncts are in the unsatisfiable core [2024-11-09 07:23:25,876 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:23:29,703 INFO L134 CoverageAnalysis]: Checked inductivity of 4144 backedges. 2775 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:23:29,703 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:23:32,712 INFO L134 CoverageAnalysis]: Checked inductivity of 4144 backedges. 2775 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:23:32,713 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2057637641] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:23:32,713 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1900295075] [2024-11-09 07:23:32,715 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:23:32,715 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:23:32,716 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:23:32,716 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:23:32,716 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:23:32,882 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:23:34,060 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '85532#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:23:34,060 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:23:34,060 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:23:34,061 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 78, 78] total 118 [2024-11-09 07:23:34,061 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107904223] [2024-11-09 07:23:34,061 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:23:34,061 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 119 states [2024-11-09 07:23:34,061 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:23:34,063 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2024-11-09 07:23:34,064 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3226, Invalid=12776, Unknown=0, NotChecked=0, Total=16002 [2024-11-09 07:23:34,065 INFO L87 Difference]: Start difference. First operand 231 states and 233 transitions. Second operand has 119 states, 119 states have (on average 3.2521008403361344) internal successors, (387), 118 states have internal predecessors, (387), 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) [2024-11-09 07:23:34,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:23:34,993 INFO L93 Difference]: Finished difference Result 389 states and 393 transitions. [2024-11-09 07:23:34,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2024-11-09 07:23:34,994 INFO L78 Accepts]: Start accepts. Automaton has has 119 states, 119 states have (on average 3.2521008403361344) internal successors, (387), 118 states have internal predecessors, (387), 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 229 [2024-11-09 07:23:34,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:23:34,995 INFO L225 Difference]: With dead ends: 389 [2024-11-09 07:23:34,995 INFO L226 Difference]: Without dead ends: 233 [2024-11-09 07:23:34,996 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 763 GetRequests, 563 SyntacticMatches, 75 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10108 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=3226, Invalid=12776, Unknown=0, NotChecked=0, Total=16002 [2024-11-09 07:23:34,996 INFO L432 NwaCegarLoop]: 40 mSDtfsCounter, 1 mSDsluCounter, 298 mSDsCounter, 0 mSdLazyCounter, 1060 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 338 SdHoareTripleChecker+Invalid, 1061 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1060 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2024-11-09 07:23:34,997 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 338 Invalid, 1061 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1060 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2024-11-09 07:23:34,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2024-11-09 07:23:35,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 233. [2024-11-09 07:23:35,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 232 states have (on average 1.0129310344827587) internal successors, (235), 232 states have internal predecessors, (235), 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) [2024-11-09 07:23:35,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 235 transitions. [2024-11-09 07:23:35,011 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 235 transitions. Word has length 229 [2024-11-09 07:23:35,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:23:35,011 INFO L471 AbstractCegarLoop]: Abstraction has 233 states and 235 transitions. [2024-11-09 07:23:35,011 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 119 states, 119 states have (on average 3.2521008403361344) internal successors, (387), 118 states have internal predecessors, (387), 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) [2024-11-09 07:23:35,011 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 235 transitions. [2024-11-09 07:23:35,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2024-11-09 07:23:35,012 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:23:35,012 INFO L215 NwaCegarLoop]: trace histogram [38, 38, 38, 38, 37, 37, 1, 1, 1, 1, 1] [2024-11-09 07:23:35,033 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Forceful destruction successful, exit code 0 [2024-11-09 07:23:35,213 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:23:35,213 INFO L396 AbstractCegarLoop]: === Iteration 76 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:23:35,213 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:23:35,213 INFO L85 PathProgramCache]: Analyzing trace with hash 1908756023, now seen corresponding path program 74 times [2024-11-09 07:23:35,214 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:23:35,214 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1289381962] [2024-11-09 07:23:35,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:23:35,214 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:23:35,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:23:37,514 INFO L134 CoverageAnalysis]: Checked inductivity of 4219 backedges. 1369 proven. 2850 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:23:37,514 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:23:37,514 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1289381962] [2024-11-09 07:23:37,514 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1289381962] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:23:37,514 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1813449870] [2024-11-09 07:23:37,515 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:23:37,515 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:23:37,515 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:23:37,516 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:23:37,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2024-11-09 07:23:38,008 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2024-11-09 07:23:38,008 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:23:38,014 INFO L255 TraceCheckSpWp]: Trace formula consists of 670 conjuncts, 82 conjuncts are in the unsatisfiable core [2024-11-09 07:23:38,018 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:23:38,424 INFO L134 CoverageAnalysis]: Checked inductivity of 4219 backedges. 1444 proven. 2775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:23:38,424 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:23:40,484 INFO L134 CoverageAnalysis]: Checked inductivity of 4219 backedges. 1444 proven. 2775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:23:40,484 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1813449870] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:23:40,484 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1919240761] [2024-11-09 07:23:40,485 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:23:40,485 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:23:40,485 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:23:40,485 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:23:40,486 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:23:40,656 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:23:41,325 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '87779#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:23:41,325 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:23:41,325 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:23:41,326 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 43 [2024-11-09 07:23:41,326 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732771433] [2024-11-09 07:23:41,326 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:23:41,327 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2024-11-09 07:23:41,327 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:23:41,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2024-11-09 07:23:41,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=856, Invalid=1796, Unknown=0, NotChecked=0, Total=2652 [2024-11-09 07:23:41,328 INFO L87 Difference]: Start difference. First operand 233 states and 235 transitions. Second operand has 44 states, 44 states have (on average 5.363636363636363) internal successors, (236), 43 states have internal predecessors, (236), 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) [2024-11-09 07:23:42,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:23:42,535 INFO L93 Difference]: Finished difference Result 246 states and 248 transitions. [2024-11-09 07:23:42,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2024-11-09 07:23:42,535 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 5.363636363636363) internal successors, (236), 43 states have internal predecessors, (236), 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 231 [2024-11-09 07:23:42,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:23:42,537 INFO L225 Difference]: With dead ends: 246 [2024-11-09 07:23:42,537 INFO L226 Difference]: Without dead ends: 244 [2024-11-09 07:23:42,538 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 807 GetRequests, 643 SyntacticMatches, 76 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3588 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=2490, Invalid=5520, Unknown=0, NotChecked=0, Total=8010 [2024-11-09 07:23:42,538 INFO L432 NwaCegarLoop]: 45 mSDtfsCounter, 19 mSDsluCounter, 235 mSDsCounter, 0 mSdLazyCounter, 342 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 280 SdHoareTripleChecker+Invalid, 343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 342 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:23:42,538 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 280 Invalid, 343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 342 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:23:42,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2024-11-09 07:23:42,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 237. [2024-11-09 07:23:42,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 236 states have (on average 1.0127118644067796) internal successors, (239), 236 states have internal predecessors, (239), 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) [2024-11-09 07:23:42,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 239 transitions. [2024-11-09 07:23:42,554 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 239 transitions. Word has length 231 [2024-11-09 07:23:42,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:23:42,554 INFO L471 AbstractCegarLoop]: Abstraction has 237 states and 239 transitions. [2024-11-09 07:23:42,554 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 5.363636363636363) internal successors, (236), 43 states have internal predecessors, (236), 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) [2024-11-09 07:23:42,555 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 239 transitions. [2024-11-09 07:23:42,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 236 [2024-11-09 07:23:42,555 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:23:42,556 INFO L215 NwaCegarLoop]: trace histogram [39, 39, 38, 38, 38, 38, 1, 1, 1, 1, 1] [2024-11-09 07:23:42,575 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Forceful destruction successful, exit code 0 [2024-11-09 07:23:42,756 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:23:42,756 INFO L396 AbstractCegarLoop]: === Iteration 77 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:23:42,756 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:23:42,757 INFO L85 PathProgramCache]: Analyzing trace with hash 1583031135, now seen corresponding path program 75 times [2024-11-09 07:23:42,757 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:23:42,757 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [499882097] [2024-11-09 07:23:42,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:23:42,757 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:23:42,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:23:47,336 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 2777 proven. 1593 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:23:47,337 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:23:47,337 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [499882097] [2024-11-09 07:23:47,337 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [499882097] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:23:47,337 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1483721004] [2024-11-09 07:23:47,337 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:23:47,337 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:23:47,338 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:23:47,339 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:23:47,340 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Waiting until timeout for monitored process [2024-11-09 07:23:47,728 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:23:47,728 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:23:47,734 INFO L255 TraceCheckSpWp]: Trace formula consists of 681 conjuncts, 80 conjuncts are in the unsatisfiable core [2024-11-09 07:23:47,738 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:23:51,801 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 2926 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:23:51,801 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:23:54,974 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 2926 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:23:54,975 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1483721004] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:23:54,975 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [547435736] [2024-11-09 07:23:54,976 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:23:54,976 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:23:54,976 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:23:54,976 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:23:54,976 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:23:55,176 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:23:56,422 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '90029#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:23:56,422 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:23:56,423 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:23:56,423 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80, 80] total 121 [2024-11-09 07:23:56,423 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091407098] [2024-11-09 07:23:56,423 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:23:56,424 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 122 states [2024-11-09 07:23:56,424 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:23:56,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2024-11-09 07:23:56,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3388, Invalid=13382, Unknown=0, NotChecked=0, Total=16770 [2024-11-09 07:23:56,426 INFO L87 Difference]: Start difference. First operand 237 states and 239 transitions. Second operand has 122 states, 122 states have (on average 3.2540983606557377) internal successors, (397), 121 states have internal predecessors, (397), 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) [2024-11-09 07:23:57,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:23:57,761 INFO L93 Difference]: Finished difference Result 399 states and 403 transitions. [2024-11-09 07:23:57,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2024-11-09 07:23:57,761 INFO L78 Accepts]: Start accepts. Automaton has has 122 states, 122 states have (on average 3.2540983606557377) internal successors, (397), 121 states have internal predecessors, (397), 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 235 [2024-11-09 07:23:57,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:23:57,762 INFO L225 Difference]: With dead ends: 399 [2024-11-09 07:23:57,763 INFO L226 Difference]: Without dead ends: 239 [2024-11-09 07:23:57,764 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 783 GetRequests, 578 SyntacticMatches, 77 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10608 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=3388, Invalid=13382, Unknown=0, NotChecked=0, Total=16770 [2024-11-09 07:23:57,765 INFO L432 NwaCegarLoop]: 41 mSDtfsCounter, 1 mSDsluCounter, 554 mSDsCounter, 0 mSdLazyCounter, 1795 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 595 SdHoareTripleChecker+Invalid, 1796 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1795 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2024-11-09 07:23:57,765 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 595 Invalid, 1796 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1795 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2024-11-09 07:23:57,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2024-11-09 07:23:57,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 239. [2024-11-09 07:23:57,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 238 states have (on average 1.0126050420168067) internal successors, (241), 238 states have internal predecessors, (241), 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) [2024-11-09 07:23:57,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 241 transitions. [2024-11-09 07:23:57,793 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 241 transitions. Word has length 235 [2024-11-09 07:23:57,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:23:57,794 INFO L471 AbstractCegarLoop]: Abstraction has 239 states and 241 transitions. [2024-11-09 07:23:57,794 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 122 states, 122 states have (on average 3.2540983606557377) internal successors, (397), 121 states have internal predecessors, (397), 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) [2024-11-09 07:23:57,794 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 241 transitions. [2024-11-09 07:23:57,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2024-11-09 07:23:57,795 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:23:57,796 INFO L215 NwaCegarLoop]: trace histogram [39, 39, 39, 39, 38, 38, 1, 1, 1, 1, 1] [2024-11-09 07:23:57,826 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Ended with exit code 0 [2024-11-09 07:23:57,996 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:23:57,997 INFO L396 AbstractCegarLoop]: === Iteration 78 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:23:57,997 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:23:57,997 INFO L85 PathProgramCache]: Analyzing trace with hash -17763356, now seen corresponding path program 76 times [2024-11-09 07:23:57,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:23:57,997 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1681971874] [2024-11-09 07:23:57,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:23:57,998 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:23:58,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:24:00,630 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 1444 proven. 3003 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:24:00,630 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:24:00,630 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1681971874] [2024-11-09 07:24:00,630 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1681971874] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:24:00,630 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1582478919] [2024-11-09 07:24:00,631 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:24:00,631 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:24:00,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:24:00,632 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:24:00,633 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Waiting until timeout for monitored process [2024-11-09 07:24:01,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:24:01,011 INFO L255 TraceCheckSpWp]: Trace formula consists of 687 conjuncts, 81 conjuncts are in the unsatisfiable core [2024-11-09 07:24:01,015 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:24:01,407 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 1521 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:24:01,407 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:24:03,531 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 1521 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:24:03,531 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1582478919] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:24:03,531 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1689058956] [2024-11-09 07:24:03,532 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:24:03,533 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:24:03,533 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:24:03,533 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:24:03,533 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:24:03,837 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:24:04,500 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '92334#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:24:04,500 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:24:04,500 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:24:04,501 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 44 [2024-11-09 07:24:04,501 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653846614] [2024-11-09 07:24:04,501 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:24:04,502 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2024-11-09 07:24:04,502 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:24:04,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2024-11-09 07:24:04,503 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=897, Invalid=1859, Unknown=0, NotChecked=0, Total=2756 [2024-11-09 07:24:04,503 INFO L87 Difference]: Start difference. First operand 239 states and 241 transitions. Second operand has 45 states, 45 states have (on average 5.377777777777778) internal successors, (242), 44 states have internal predecessors, (242), 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) [2024-11-09 07:24:05,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:24:05,757 INFO L93 Difference]: Finished difference Result 252 states and 254 transitions. [2024-11-09 07:24:05,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2024-11-09 07:24:05,758 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 5.377777777777778) internal successors, (242), 44 states have internal predecessors, (242), 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 237 [2024-11-09 07:24:05,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:24:05,759 INFO L225 Difference]: With dead ends: 252 [2024-11-09 07:24:05,759 INFO L226 Difference]: Without dead ends: 250 [2024-11-09 07:24:05,760 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 828 GetRequests, 659 SyntacticMatches, 79 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3799 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=2613, Invalid=5759, Unknown=0, NotChecked=0, Total=8372 [2024-11-09 07:24:05,761 INFO L432 NwaCegarLoop]: 46 mSDtfsCounter, 17 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 345 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 346 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 345 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:24:05,761 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 279 Invalid, 346 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 345 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:24:05,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2024-11-09 07:24:05,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 243. [2024-11-09 07:24:05,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 242 states have (on average 1.012396694214876) internal successors, (245), 242 states have internal predecessors, (245), 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) [2024-11-09 07:24:05,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 245 transitions. [2024-11-09 07:24:05,797 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 245 transitions. Word has length 237 [2024-11-09 07:24:05,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:24:05,797 INFO L471 AbstractCegarLoop]: Abstraction has 243 states and 245 transitions. [2024-11-09 07:24:05,798 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 5.377777777777778) internal successors, (242), 44 states have internal predecessors, (242), 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) [2024-11-09 07:24:05,798 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 245 transitions. [2024-11-09 07:24:05,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 242 [2024-11-09 07:24:05,800 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:24:05,800 INFO L215 NwaCegarLoop]: trace histogram [40, 40, 39, 39, 39, 39, 1, 1, 1, 1, 1] [2024-11-09 07:24:05,833 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Forceful destruction successful, exit code 0 [2024-11-09 07:24:06,000 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable77 [2024-11-09 07:24:06,001 INFO L396 AbstractCegarLoop]: === Iteration 79 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:24:06,001 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:24:06,002 INFO L85 PathProgramCache]: Analyzing trace with hash 2092051084, now seen corresponding path program 77 times [2024-11-09 07:24:06,002 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:24:06,002 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [485613350] [2024-11-09 07:24:06,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:24:06,002 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:24:06,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:24:10,687 INFO L134 CoverageAnalysis]: Checked inductivity of 4602 backedges. 2928 proven. 1674 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:24:10,687 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:24:10,687 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [485613350] [2024-11-09 07:24:10,687 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [485613350] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:24:10,687 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1146224064] [2024-11-09 07:24:10,687 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:24:10,688 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:24:10,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:24:10,690 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:24:10,691 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Waiting until timeout for monitored process [2024-11-09 07:24:11,202 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2024-11-09 07:24:11,203 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:24:11,208 INFO L255 TraceCheckSpWp]: Trace formula consists of 698 conjuncts, 82 conjuncts are in the unsatisfiable core [2024-11-09 07:24:11,211 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:24:15,548 INFO L134 CoverageAnalysis]: Checked inductivity of 4602 backedges. 3081 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:24:15,548 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:24:18,763 INFO L134 CoverageAnalysis]: Checked inductivity of 4602 backedges. 3081 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:24:18,763 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1146224064] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:24:18,763 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [67244992] [2024-11-09 07:24:18,764 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:24:18,764 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:24:18,764 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:24:18,764 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:24:18,764 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:24:18,928 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:24:20,154 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '94641#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:24:20,154 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:24:20,154 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:24:20,154 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [82, 82, 82] total 124 [2024-11-09 07:24:20,154 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810983005] [2024-11-09 07:24:20,154 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:24:20,155 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 125 states [2024-11-09 07:24:20,156 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:24:20,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2024-11-09 07:24:20,159 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3554, Invalid=14002, Unknown=0, NotChecked=0, Total=17556 [2024-11-09 07:24:20,159 INFO L87 Difference]: Start difference. First operand 243 states and 245 transitions. Second operand has 125 states, 125 states have (on average 3.256) internal successors, (407), 124 states have internal predecessors, (407), 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) [2024-11-09 07:24:21,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:24:21,266 INFO L93 Difference]: Finished difference Result 409 states and 413 transitions. [2024-11-09 07:24:21,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2024-11-09 07:24:21,267 INFO L78 Accepts]: Start accepts. Automaton has has 125 states, 125 states have (on average 3.256) internal successors, (407), 124 states have internal predecessors, (407), 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 241 [2024-11-09 07:24:21,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:24:21,269 INFO L225 Difference]: With dead ends: 409 [2024-11-09 07:24:21,269 INFO L226 Difference]: Without dead ends: 245 [2024-11-09 07:24:21,271 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 803 GetRequests, 593 SyntacticMatches, 79 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11120 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=3554, Invalid=14002, Unknown=0, NotChecked=0, Total=17556 [2024-11-09 07:24:21,271 INFO L432 NwaCegarLoop]: 42 mSDtfsCounter, 1 mSDsluCounter, 376 mSDsCounter, 0 mSdLazyCounter, 1311 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 418 SdHoareTripleChecker+Invalid, 1312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2024-11-09 07:24:21,272 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 418 Invalid, 1312 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1311 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2024-11-09 07:24:21,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2024-11-09 07:24:21,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 245. [2024-11-09 07:24:21,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 245 states, 244 states have (on average 1.0122950819672132) internal successors, (247), 244 states have internal predecessors, (247), 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) [2024-11-09 07:24:21,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 247 transitions. [2024-11-09 07:24:21,301 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 247 transitions. Word has length 241 [2024-11-09 07:24:21,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:24:21,301 INFO L471 AbstractCegarLoop]: Abstraction has 245 states and 247 transitions. [2024-11-09 07:24:21,302 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 125 states, 125 states have (on average 3.256) internal successors, (407), 124 states have internal predecessors, (407), 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) [2024-11-09 07:24:21,302 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 247 transitions. [2024-11-09 07:24:21,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2024-11-09 07:24:21,319 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:24:21,320 INFO L215 NwaCegarLoop]: trace histogram [40, 40, 40, 40, 39, 39, 1, 1, 1, 1, 1] [2024-11-09 07:24:21,350 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Forceful destruction successful, exit code 0 [2024-11-09 07:24:21,520 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:24:21,520 INFO L396 AbstractCegarLoop]: === Iteration 80 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:24:21,521 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:24:21,521 INFO L85 PathProgramCache]: Analyzing trace with hash 625525585, now seen corresponding path program 78 times [2024-11-09 07:24:21,521 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:24:21,521 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044440317] [2024-11-09 07:24:21,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:24:21,521 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:24:21,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:24:24,114 INFO L134 CoverageAnalysis]: Checked inductivity of 4681 backedges. 1521 proven. 3160 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:24:24,114 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:24:24,114 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2044440317] [2024-11-09 07:24:24,115 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2044440317] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:24:24,115 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [123548035] [2024-11-09 07:24:24,115 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:24:24,115 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:24:24,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:24:24,116 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:24:24,117 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Waiting until timeout for monitored process [2024-11-09 07:24:24,527 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:24:24,527 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:24:24,533 INFO L255 TraceCheckSpWp]: Trace formula consists of 704 conjuncts, 86 conjuncts are in the unsatisfiable core [2024-11-09 07:24:24,537 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:24:24,927 INFO L134 CoverageAnalysis]: Checked inductivity of 4681 backedges. 1600 proven. 3081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:24:24,927 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:24:27,210 INFO L134 CoverageAnalysis]: Checked inductivity of 4681 backedges. 1600 proven. 3081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:24:27,210 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [123548035] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:24:27,210 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1276353868] [2024-11-09 07:24:27,211 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:24:27,212 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:24:27,212 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:24:27,212 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:24:27,212 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:24:27,349 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:24:28,023 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '97004#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:24:28,023 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:24:28,023 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:24:28,023 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 45 [2024-11-09 07:24:28,023 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972882243] [2024-11-09 07:24:28,023 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:24:28,024 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2024-11-09 07:24:28,024 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:24:28,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2024-11-09 07:24:28,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=939, Invalid=1923, Unknown=0, NotChecked=0, Total=2862 [2024-11-09 07:24:28,025 INFO L87 Difference]: Start difference. First operand 245 states and 247 transitions. Second operand has 46 states, 46 states have (on average 5.391304347826087) internal successors, (248), 45 states have internal predecessors, (248), 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) [2024-11-09 07:24:29,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:24:29,357 INFO L93 Difference]: Finished difference Result 258 states and 260 transitions. [2024-11-09 07:24:29,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2024-11-09 07:24:29,357 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 5.391304347826087) internal successors, (248), 45 states have internal predecessors, (248), 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 243 [2024-11-09 07:24:29,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:24:29,359 INFO L225 Difference]: With dead ends: 258 [2024-11-09 07:24:29,359 INFO L226 Difference]: Without dead ends: 256 [2024-11-09 07:24:29,359 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 849 GetRequests, 677 SyntacticMatches, 80 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3936 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=2739, Invalid=6003, Unknown=0, NotChecked=0, Total=8742 [2024-11-09 07:24:29,360 INFO L432 NwaCegarLoop]: 47 mSDtfsCounter, 17 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 361 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 293 SdHoareTripleChecker+Invalid, 362 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 361 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:24:29,360 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 293 Invalid, 362 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 361 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:24:29,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2024-11-09 07:24:29,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 249. [2024-11-09 07:24:29,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 248 states have (on average 1.0120967741935485) internal successors, (251), 248 states have internal predecessors, (251), 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) [2024-11-09 07:24:29,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 251 transitions. [2024-11-09 07:24:29,377 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 251 transitions. Word has length 243 [2024-11-09 07:24:29,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:24:29,378 INFO L471 AbstractCegarLoop]: Abstraction has 249 states and 251 transitions. [2024-11-09 07:24:29,378 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 5.391304347826087) internal successors, (248), 45 states have internal predecessors, (248), 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) [2024-11-09 07:24:29,378 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 251 transitions. [2024-11-09 07:24:29,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2024-11-09 07:24:29,380 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:24:29,380 INFO L215 NwaCegarLoop]: trace histogram [41, 41, 40, 40, 40, 40, 1, 1, 1, 1, 1] [2024-11-09 07:24:29,410 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Forceful destruction successful, exit code 0 [2024-11-09 07:24:29,580 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable79 [2024-11-09 07:24:29,581 INFO L396 AbstractCegarLoop]: === Iteration 81 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:24:29,581 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:24:29,581 INFO L85 PathProgramCache]: Analyzing trace with hash 176847737, now seen corresponding path program 79 times [2024-11-09 07:24:29,581 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:24:29,581 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [735920293] [2024-11-09 07:24:29,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:24:29,582 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:24:29,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:24:33,909 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 3083 proven. 1757 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:24:33,909 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:24:33,910 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [735920293] [2024-11-09 07:24:33,910 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [735920293] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:24:33,910 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1277090367] [2024-11-09 07:24:33,910 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:24:33,910 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:24:33,910 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:24:33,911 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:24:33,912 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2024-11-09 07:24:34,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:24:34,278 INFO L255 TraceCheckSpWp]: Trace formula consists of 715 conjuncts, 84 conjuncts are in the unsatisfiable core [2024-11-09 07:24:34,283 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:24:38,047 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 3240 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:24:38,048 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:24:40,873 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 3240 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:24:40,873 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1277090367] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:24:40,873 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1992180748] [2024-11-09 07:24:40,874 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:24:40,874 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:24:40,874 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:24:40,874 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:24:40,874 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:24:41,079 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:24:42,195 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '99368#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:24:42,195 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:24:42,195 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:24:42,195 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84, 84] total 127 [2024-11-09 07:24:42,196 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538911884] [2024-11-09 07:24:42,196 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:24:42,196 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 128 states [2024-11-09 07:24:42,197 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:24:42,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2024-11-09 07:24:42,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3724, Invalid=14636, Unknown=0, NotChecked=0, Total=18360 [2024-11-09 07:24:42,199 INFO L87 Difference]: Start difference. First operand 249 states and 251 transitions. Second operand has 128 states, 128 states have (on average 3.2578125) internal successors, (417), 127 states have internal predecessors, (417), 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) [2024-11-09 07:24:43,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:24:43,162 INFO L93 Difference]: Finished difference Result 419 states and 423 transitions. [2024-11-09 07:24:43,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2024-11-09 07:24:43,163 INFO L78 Accepts]: Start accepts. Automaton has has 128 states, 128 states have (on average 3.2578125) internal successors, (417), 127 states have internal predecessors, (417), 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 247 [2024-11-09 07:24:43,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:24:43,165 INFO L225 Difference]: With dead ends: 419 [2024-11-09 07:24:43,165 INFO L226 Difference]: Without dead ends: 251 [2024-11-09 07:24:43,166 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 823 GetRequests, 608 SyntacticMatches, 81 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11644 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=3724, Invalid=14636, Unknown=0, NotChecked=0, Total=18360 [2024-11-09 07:24:43,166 INFO L432 NwaCegarLoop]: 43 mSDtfsCounter, 1 mSDsluCounter, 305 mSDsCounter, 0 mSdLazyCounter, 1102 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 348 SdHoareTripleChecker+Invalid, 1103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2024-11-09 07:24:43,166 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 348 Invalid, 1103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1102 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2024-11-09 07:24:43,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2024-11-09 07:24:43,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 251. [2024-11-09 07:24:43,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 250 states have (on average 1.012) internal successors, (253), 250 states have internal predecessors, (253), 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) [2024-11-09 07:24:43,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 253 transitions. [2024-11-09 07:24:43,178 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 253 transitions. Word has length 247 [2024-11-09 07:24:43,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:24:43,178 INFO L471 AbstractCegarLoop]: Abstraction has 251 states and 253 transitions. [2024-11-09 07:24:43,179 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 128 states, 128 states have (on average 3.2578125) internal successors, (417), 127 states have internal predecessors, (417), 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) [2024-11-09 07:24:43,179 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 253 transitions. [2024-11-09 07:24:43,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2024-11-09 07:24:43,179 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:24:43,179 INFO L215 NwaCegarLoop]: trace histogram [41, 41, 41, 41, 40, 40, 1, 1, 1, 1, 1] [2024-11-09 07:24:43,194 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Ended with exit code 0 [2024-11-09 07:24:43,380 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:24:43,380 INFO L396 AbstractCegarLoop]: === Iteration 82 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:24:43,380 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:24:43,380 INFO L85 PathProgramCache]: Analyzing trace with hash -755323778, now seen corresponding path program 80 times [2024-11-09 07:24:43,380 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:24:43,381 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [618768074] [2024-11-09 07:24:43,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:24:43,381 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:24:43,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:24:45,501 INFO L134 CoverageAnalysis]: Checked inductivity of 4921 backedges. 1600 proven. 3321 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:24:45,501 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:24:45,501 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [618768074] [2024-11-09 07:24:45,501 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [618768074] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:24:45,502 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [394303920] [2024-11-09 07:24:45,502 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:24:45,502 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:24:45,502 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:24:45,503 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:24:45,504 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2024-11-09 07:24:45,938 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2024-11-09 07:24:45,938 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:24:45,944 INFO L255 TraceCheckSpWp]: Trace formula consists of 721 conjuncts, 88 conjuncts are in the unsatisfiable core [2024-11-09 07:24:45,947 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:24:46,267 INFO L134 CoverageAnalysis]: Checked inductivity of 4921 backedges. 1681 proven. 3240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:24:46,267 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:24:48,190 INFO L134 CoverageAnalysis]: Checked inductivity of 4921 backedges. 1681 proven. 3240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:24:48,190 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [394303920] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:24:48,191 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [985794622] [2024-11-09 07:24:48,191 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:24:48,191 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:24:48,192 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:24:48,192 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:24:48,192 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:24:48,363 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:24:48,930 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '101789#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:24:48,930 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:24:48,930 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:24:48,931 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 46 [2024-11-09 07:24:48,931 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904865411] [2024-11-09 07:24:48,931 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:24:48,931 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2024-11-09 07:24:48,931 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:24:48,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2024-11-09 07:24:48,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=982, Invalid=1988, Unknown=0, NotChecked=0, Total=2970 [2024-11-09 07:24:48,932 INFO L87 Difference]: Start difference. First operand 251 states and 253 transitions. Second operand has 47 states, 47 states have (on average 5.404255319148936) internal successors, (254), 46 states have internal predecessors, (254), 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) [2024-11-09 07:24:50,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:24:50,099 INFO L93 Difference]: Finished difference Result 264 states and 266 transitions. [2024-11-09 07:24:50,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2024-11-09 07:24:50,100 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 5.404255319148936) internal successors, (254), 46 states have internal predecessors, (254), 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 249 [2024-11-09 07:24:50,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:24:50,101 INFO L225 Difference]: With dead ends: 264 [2024-11-09 07:24:50,101 INFO L226 Difference]: Without dead ends: 262 [2024-11-09 07:24:50,102 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 870 GetRequests, 694 SyntacticMatches, 82 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4116 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=2868, Invalid=6252, Unknown=0, NotChecked=0, Total=9120 [2024-11-09 07:24:50,102 INFO L432 NwaCegarLoop]: 48 mSDtfsCounter, 14 mSDsluCounter, 346 mSDsCounter, 0 mSdLazyCounter, 456 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 394 SdHoareTripleChecker+Invalid, 457 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 456 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:24:50,102 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 394 Invalid, 457 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 456 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:24:50,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2024-11-09 07:24:50,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 255. [2024-11-09 07:24:50,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 255 states, 254 states have (on average 1.0118110236220472) internal successors, (257), 254 states have internal predecessors, (257), 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) [2024-11-09 07:24:50,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 257 transitions. [2024-11-09 07:24:50,130 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 257 transitions. Word has length 249 [2024-11-09 07:24:50,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:24:50,131 INFO L471 AbstractCegarLoop]: Abstraction has 255 states and 257 transitions. [2024-11-09 07:24:50,131 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 5.404255319148936) internal successors, (254), 46 states have internal predecessors, (254), 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) [2024-11-09 07:24:50,131 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 257 transitions. [2024-11-09 07:24:50,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 254 [2024-11-09 07:24:50,133 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:24:50,133 INFO L215 NwaCegarLoop]: trace histogram [42, 42, 41, 41, 41, 41, 1, 1, 1, 1, 1] [2024-11-09 07:24:50,161 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Ended with exit code 0 [2024-11-09 07:24:50,333 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:24:50,334 INFO L396 AbstractCegarLoop]: === Iteration 83 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:24:50,334 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:24:50,334 INFO L85 PathProgramCache]: Analyzing trace with hash 1301939750, now seen corresponding path program 81 times [2024-11-09 07:24:50,334 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:24:50,334 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1912520505] [2024-11-09 07:24:50,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:24:50,335 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:24:50,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:24:54,298 INFO L134 CoverageAnalysis]: Checked inductivity of 5084 backedges. 3242 proven. 1842 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:24:54,298 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:24:54,299 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1912520505] [2024-11-09 07:24:54,299 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1912520505] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:24:54,299 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [970075370] [2024-11-09 07:24:54,299 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:24:54,299 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:24:54,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:24:54,300 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:24:54,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Waiting until timeout for monitored process [2024-11-09 07:24:54,649 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:24:54,649 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:24:54,654 INFO L255 TraceCheckSpWp]: Trace formula consists of 732 conjuncts, 86 conjuncts are in the unsatisfiable core [2024-11-09 07:24:54,657 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:24:58,266 INFO L134 CoverageAnalysis]: Checked inductivity of 5084 backedges. 3403 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:24:58,266 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:25:01,004 INFO L134 CoverageAnalysis]: Checked inductivity of 5084 backedges. 3403 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:25:01,004 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [970075370] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:25:01,004 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [927557310] [2024-11-09 07:25:01,005 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:25:01,005 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:25:01,005 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:25:01,006 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:25:01,006 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:25:01,124 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:25:02,154 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '104210#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:25:02,154 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:25:02,154 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:25:02,155 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [86, 86, 86] total 130 [2024-11-09 07:25:02,155 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199400097] [2024-11-09 07:25:02,155 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:25:02,155 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 131 states [2024-11-09 07:25:02,155 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:25:02,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2024-11-09 07:25:02,157 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3898, Invalid=15284, Unknown=0, NotChecked=0, Total=19182 [2024-11-09 07:25:02,158 INFO L87 Difference]: Start difference. First operand 255 states and 257 transitions. Second operand has 131 states, 131 states have (on average 3.2595419847328246) internal successors, (427), 130 states have internal predecessors, (427), 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) [2024-11-09 07:25:03,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:25:03,245 INFO L93 Difference]: Finished difference Result 429 states and 433 transitions. [2024-11-09 07:25:03,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2024-11-09 07:25:03,245 INFO L78 Accepts]: Start accepts. Automaton has has 131 states, 131 states have (on average 3.2595419847328246) internal successors, (427), 130 states have internal predecessors, (427), 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 253 [2024-11-09 07:25:03,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:25:03,247 INFO L225 Difference]: With dead ends: 429 [2024-11-09 07:25:03,247 INFO L226 Difference]: Without dead ends: 257 [2024-11-09 07:25:03,249 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 843 GetRequests, 623 SyntacticMatches, 83 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12180 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=3898, Invalid=15284, Unknown=0, NotChecked=0, Total=19182 [2024-11-09 07:25:03,249 INFO L432 NwaCegarLoop]: 44 mSDtfsCounter, 1 mSDsluCounter, 418 mSDsCounter, 0 mSdLazyCounter, 1437 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 462 SdHoareTripleChecker+Invalid, 1438 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1437 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2024-11-09 07:25:03,250 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 462 Invalid, 1438 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1437 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2024-11-09 07:25:03,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2024-11-09 07:25:03,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 257. [2024-11-09 07:25:03,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 256 states have (on average 1.01171875) internal successors, (259), 256 states have internal predecessors, (259), 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) [2024-11-09 07:25:03,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 259 transitions. [2024-11-09 07:25:03,277 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 259 transitions. Word has length 253 [2024-11-09 07:25:03,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:25:03,277 INFO L471 AbstractCegarLoop]: Abstraction has 257 states and 259 transitions. [2024-11-09 07:25:03,278 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 131 states, 131 states have (on average 3.2595419847328246) internal successors, (427), 130 states have internal predecessors, (427), 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) [2024-11-09 07:25:03,278 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 259 transitions. [2024-11-09 07:25:03,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2024-11-09 07:25:03,279 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:25:03,279 INFO L215 NwaCegarLoop]: trace histogram [42, 42, 42, 42, 41, 41, 1, 1, 1, 1, 1] [2024-11-09 07:25:03,301 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Forceful destruction successful, exit code 0 [2024-11-09 07:25:03,480 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:25:03,480 INFO L396 AbstractCegarLoop]: === Iteration 84 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:25:03,480 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:25:03,480 INFO L85 PathProgramCache]: Analyzing trace with hash 467705707, now seen corresponding path program 82 times [2024-11-09 07:25:03,480 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:25:03,480 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [737317105] [2024-11-09 07:25:03,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:25:03,481 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:25:03,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:25:05,676 INFO L134 CoverageAnalysis]: Checked inductivity of 5167 backedges. 1681 proven. 3486 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:25:05,676 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:25:05,676 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [737317105] [2024-11-09 07:25:05,676 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [737317105] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:25:05,676 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [333811749] [2024-11-09 07:25:05,676 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:25:05,677 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:25:05,677 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:25:05,678 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:25:05,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2024-11-09 07:25:06,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:25:06,028 INFO L255 TraceCheckSpWp]: Trace formula consists of 738 conjuncts, 87 conjuncts are in the unsatisfiable core [2024-11-09 07:25:06,031 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:25:06,332 INFO L134 CoverageAnalysis]: Checked inductivity of 5167 backedges. 1764 proven. 3403 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:25:06,333 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:25:08,183 INFO L134 CoverageAnalysis]: Checked inductivity of 5167 backedges. 1764 proven. 3403 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:25:08,183 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [333811749] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:25:08,183 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [763169267] [2024-11-09 07:25:08,184 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:25:08,184 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:25:08,184 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:25:08,184 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:25:08,184 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:25:08,316 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:25:08,863 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '106689#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:25:08,863 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:25:08,863 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:25:08,863 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 47 [2024-11-09 07:25:08,863 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810334487] [2024-11-09 07:25:08,864 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:25:08,864 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2024-11-09 07:25:08,864 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:25:08,865 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2024-11-09 07:25:08,865 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1026, Invalid=2054, Unknown=0, NotChecked=0, Total=3080 [2024-11-09 07:25:08,865 INFO L87 Difference]: Start difference. First operand 257 states and 259 transitions. Second operand has 48 states, 48 states have (on average 5.416666666666667) internal successors, (260), 47 states have internal predecessors, (260), 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) [2024-11-09 07:25:09,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:25:09,971 INFO L93 Difference]: Finished difference Result 270 states and 272 transitions. [2024-11-09 07:25:09,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2024-11-09 07:25:09,971 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 5.416666666666667) internal successors, (260), 47 states have internal predecessors, (260), 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 255 [2024-11-09 07:25:09,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:25:09,972 INFO L225 Difference]: With dead ends: 270 [2024-11-09 07:25:09,972 INFO L226 Difference]: Without dead ends: 268 [2024-11-09 07:25:09,973 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 891 GetRequests, 710 SyntacticMatches, 85 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4342 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=3000, Invalid=6506, Unknown=0, NotChecked=0, Total=9506 [2024-11-09 07:25:09,973 INFO L432 NwaCegarLoop]: 49 mSDtfsCounter, 12 mSDsluCounter, 333 mSDsCounter, 0 mSdLazyCounter, 448 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 382 SdHoareTripleChecker+Invalid, 449 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 448 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:25:09,974 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 382 Invalid, 449 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 448 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:25:09,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2024-11-09 07:25:09,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 261. [2024-11-09 07:25:09,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 260 states have (on average 1.0115384615384615) internal successors, (263), 260 states have internal predecessors, (263), 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) [2024-11-09 07:25:09,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 263 transitions. [2024-11-09 07:25:09,990 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 263 transitions. Word has length 255 [2024-11-09 07:25:09,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:25:09,990 INFO L471 AbstractCegarLoop]: Abstraction has 261 states and 263 transitions. [2024-11-09 07:25:09,990 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 5.416666666666667) internal successors, (260), 47 states have internal predecessors, (260), 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) [2024-11-09 07:25:09,990 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 263 transitions. [2024-11-09 07:25:09,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 260 [2024-11-09 07:25:09,991 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:25:09,991 INFO L215 NwaCegarLoop]: trace histogram [43, 43, 42, 42, 42, 42, 1, 1, 1, 1, 1] [2024-11-09 07:25:10,010 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Forceful destruction successful, exit code 0 [2024-11-09 07:25:10,191 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable83 [2024-11-09 07:25:10,192 INFO L396 AbstractCegarLoop]: === Iteration 85 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:25:10,192 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:25:10,192 INFO L85 PathProgramCache]: Analyzing trace with hash -79512941, now seen corresponding path program 83 times [2024-11-09 07:25:10,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:25:10,192 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1781929481] [2024-11-09 07:25:10,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:25:10,192 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:25:10,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:25:14,221 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 3405 proven. 1929 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:25:14,221 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:25:14,221 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1781929481] [2024-11-09 07:25:14,221 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1781929481] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:25:14,221 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1263591078] [2024-11-09 07:25:14,221 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:25:14,221 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:25:14,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:25:14,225 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:25:14,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2024-11-09 07:25:14,658 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 43 check-sat command(s) [2024-11-09 07:25:14,658 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:25:14,663 INFO L255 TraceCheckSpWp]: Trace formula consists of 749 conjuncts, 88 conjuncts are in the unsatisfiable core [2024-11-09 07:25:14,666 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:25:18,482 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 3570 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:25:18,482 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:25:21,349 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 3570 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:25:21,349 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1263591078] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:25:21,349 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [615909749] [2024-11-09 07:25:21,350 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:25:21,350 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:25:21,350 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:25:21,350 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:25:21,350 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:25:21,465 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:25:22,534 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '109167#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:25:22,535 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:25:22,535 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:25:22,535 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88, 88] total 133 [2024-11-09 07:25:22,535 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994898426] [2024-11-09 07:25:22,535 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:25:22,536 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 134 states [2024-11-09 07:25:22,536 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:25:22,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2024-11-09 07:25:22,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4076, Invalid=15946, Unknown=0, NotChecked=0, Total=20022 [2024-11-09 07:25:22,540 INFO L87 Difference]: Start difference. First operand 261 states and 263 transitions. Second operand has 134 states, 134 states have (on average 3.283582089552239) internal successors, (440), 133 states have internal predecessors, (440), 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) [2024-11-09 07:25:23,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:25:23,706 INFO L93 Difference]: Finished difference Result 439 states and 443 transitions. [2024-11-09 07:25:23,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2024-11-09 07:25:23,707 INFO L78 Accepts]: Start accepts. Automaton has has 134 states, 134 states have (on average 3.283582089552239) internal successors, (440), 133 states have internal predecessors, (440), 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 259 [2024-11-09 07:25:23,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:25:23,708 INFO L225 Difference]: With dead ends: 439 [2024-11-09 07:25:23,708 INFO L226 Difference]: Without dead ends: 263 [2024-11-09 07:25:23,710 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 863 GetRequests, 638 SyntacticMatches, 85 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12728 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=4076, Invalid=15946, Unknown=0, NotChecked=0, Total=20022 [2024-11-09 07:25:23,710 INFO L432 NwaCegarLoop]: 45 mSDtfsCounter, 1 mSDsluCounter, 521 mSDsCounter, 0 mSdLazyCounter, 1733 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 566 SdHoareTripleChecker+Invalid, 1734 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1733 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2024-11-09 07:25:23,710 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 566 Invalid, 1734 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1733 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2024-11-09 07:25:23,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2024-11-09 07:25:23,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 263. [2024-11-09 07:25:23,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 262 states have (on average 1.0114503816793894) internal successors, (265), 262 states have internal predecessors, (265), 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) [2024-11-09 07:25:23,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 265 transitions. [2024-11-09 07:25:23,726 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 265 transitions. Word has length 259 [2024-11-09 07:25:23,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:25:23,726 INFO L471 AbstractCegarLoop]: Abstraction has 263 states and 265 transitions. [2024-11-09 07:25:23,726 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 134 states, 134 states have (on average 3.283582089552239) internal successors, (440), 133 states have internal predecessors, (440), 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) [2024-11-09 07:25:23,727 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 265 transitions. [2024-11-09 07:25:23,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2024-11-09 07:25:23,728 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:25:23,728 INFO L215 NwaCegarLoop]: trace histogram [43, 43, 43, 43, 42, 42, 1, 1, 1, 1, 1] [2024-11-09 07:25:23,748 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Forceful destruction successful, exit code 0 [2024-11-09 07:25:23,928 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:25:23,928 INFO L396 AbstractCegarLoop]: === Iteration 86 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:25:23,929 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:25:23,929 INFO L85 PathProgramCache]: Analyzing trace with hash 1484819480, now seen corresponding path program 84 times [2024-11-09 07:25:23,929 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:25:23,929 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1598320465] [2024-11-09 07:25:23,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:25:23,929 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:25:23,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:25:26,160 INFO L134 CoverageAnalysis]: Checked inductivity of 5419 backedges. 1764 proven. 3655 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:25:26,160 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:25:26,160 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1598320465] [2024-11-09 07:25:26,160 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1598320465] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:25:26,161 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [975715771] [2024-11-09 07:25:26,161 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:25:26,161 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:25:26,161 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:25:26,162 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:25:26,163 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Waiting until timeout for monitored process [2024-11-09 07:25:26,518 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:25:26,518 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:25:26,523 INFO L255 TraceCheckSpWp]: Trace formula consists of 755 conjuncts, 92 conjuncts are in the unsatisfiable core [2024-11-09 07:25:26,526 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:25:26,850 INFO L134 CoverageAnalysis]: Checked inductivity of 5419 backedges. 1849 proven. 3570 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:25:26,851 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:25:28,943 INFO L134 CoverageAnalysis]: Checked inductivity of 5419 backedges. 1849 proven. 3570 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:25:28,943 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [975715771] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:25:28,944 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1685097098] [2024-11-09 07:25:28,944 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:25:28,944 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:25:28,945 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:25:28,945 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:25:28,945 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:25:29,099 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:25:29,701 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '111704#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:25:29,701 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:25:29,701 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:25:29,701 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 48 [2024-11-09 07:25:29,701 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869489233] [2024-11-09 07:25:29,701 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:25:29,702 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2024-11-09 07:25:29,702 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:25:29,703 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2024-11-09 07:25:29,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1071, Invalid=2121, Unknown=0, NotChecked=0, Total=3192 [2024-11-09 07:25:29,704 INFO L87 Difference]: Start difference. First operand 263 states and 265 transitions. Second operand has 49 states, 49 states have (on average 5.428571428571429) internal successors, (266), 48 states have internal predecessors, (266), 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) [2024-11-09 07:25:30,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:25:30,882 INFO L93 Difference]: Finished difference Result 276 states and 278 transitions. [2024-11-09 07:25:30,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2024-11-09 07:25:30,882 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 5.428571428571429) internal successors, (266), 48 states have internal predecessors, (266), 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 261 [2024-11-09 07:25:30,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:25:30,883 INFO L225 Difference]: With dead ends: 276 [2024-11-09 07:25:30,883 INFO L226 Difference]: Without dead ends: 274 [2024-11-09 07:25:30,884 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 912 GetRequests, 728 SyntacticMatches, 86 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4488 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3135, Invalid=6765, Unknown=0, NotChecked=0, Total=9900 [2024-11-09 07:25:30,884 INFO L432 NwaCegarLoop]: 50 mSDtfsCounter, 16 mSDsluCounter, 322 mSDsCounter, 0 mSdLazyCounter, 440 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 372 SdHoareTripleChecker+Invalid, 441 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:25:30,885 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 372 Invalid, 441 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 440 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:25:30,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2024-11-09 07:25:30,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 267. [2024-11-09 07:25:30,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 267 states, 266 states have (on average 1.0112781954887218) internal successors, (269), 266 states have internal predecessors, (269), 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) [2024-11-09 07:25:30,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 269 transitions. [2024-11-09 07:25:30,910 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 269 transitions. Word has length 261 [2024-11-09 07:25:30,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:25:30,910 INFO L471 AbstractCegarLoop]: Abstraction has 267 states and 269 transitions. [2024-11-09 07:25:30,910 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 5.428571428571429) internal successors, (266), 48 states have internal predecessors, (266), 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) [2024-11-09 07:25:30,910 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 269 transitions. [2024-11-09 07:25:30,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2024-11-09 07:25:30,912 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:25:30,912 INFO L215 NwaCegarLoop]: trace histogram [44, 44, 43, 43, 43, 43, 1, 1, 1, 1, 1] [2024-11-09 07:25:30,935 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Ended with exit code 0 [2024-11-09 07:25:31,112 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable85,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:25:31,112 INFO L396 AbstractCegarLoop]: === Iteration 87 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:25:31,113 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:25:31,113 INFO L85 PathProgramCache]: Analyzing trace with hash -678262592, now seen corresponding path program 85 times [2024-11-09 07:25:31,113 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:25:31,113 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1845284765] [2024-11-09 07:25:31,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:25:31,113 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:25:31,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:25:35,432 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 3572 proven. 2018 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:25:35,433 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:25:35,433 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1845284765] [2024-11-09 07:25:35,433 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1845284765] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:25:35,433 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2009170389] [2024-11-09 07:25:35,433 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:25:35,433 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:25:35,433 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:25:35,435 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:25:35,437 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Waiting until timeout for monitored process [2024-11-09 07:25:35,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:25:35,793 INFO L255 TraceCheckSpWp]: Trace formula consists of 766 conjuncts, 90 conjuncts are in the unsatisfiable core [2024-11-09 07:25:35,796 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:25:39,850 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 3741 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:25:39,850 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:25:42,986 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 3741 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:25:42,987 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2009170389] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:25:42,987 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1394924617] [2024-11-09 07:25:42,988 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:25:42,988 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:25:42,988 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:25:42,988 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:25:42,988 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:25:43,103 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:25:44,142 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '114239#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:25:44,142 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:25:44,142 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:25:44,142 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 90, 90] total 136 [2024-11-09 07:25:44,142 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1857802206] [2024-11-09 07:25:44,142 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:25:44,143 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 137 states [2024-11-09 07:25:44,143 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:25:44,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2024-11-09 07:25:44,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4258, Invalid=16622, Unknown=0, NotChecked=0, Total=20880 [2024-11-09 07:25:44,145 INFO L87 Difference]: Start difference. First operand 267 states and 269 transitions. Second operand has 137 states, 137 states have (on average 3.2627737226277373) internal successors, (447), 136 states have internal predecessors, (447), 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) [2024-11-09 07:25:45,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:25:45,575 INFO L93 Difference]: Finished difference Result 449 states and 453 transitions. [2024-11-09 07:25:45,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2024-11-09 07:25:45,576 INFO L78 Accepts]: Start accepts. Automaton has has 137 states, 137 states have (on average 3.2627737226277373) internal successors, (447), 136 states have internal predecessors, (447), 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 265 [2024-11-09 07:25:45,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:25:45,577 INFO L225 Difference]: With dead ends: 449 [2024-11-09 07:25:45,577 INFO L226 Difference]: Without dead ends: 269 [2024-11-09 07:25:45,578 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 883 GetRequests, 653 SyntacticMatches, 87 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13288 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=4258, Invalid=16622, Unknown=0, NotChecked=0, Total=20880 [2024-11-09 07:25:45,579 INFO L432 NwaCegarLoop]: 46 mSDtfsCounter, 1 mSDsluCounter, 732 mSDsCounter, 0 mSdLazyCounter, 2347 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 778 SdHoareTripleChecker+Invalid, 2348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2347 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:25:45,579 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 778 Invalid, 2348 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2347 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2024-11-09 07:25:45,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2024-11-09 07:25:45,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 269. [2024-11-09 07:25:45,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 269 states, 268 states have (on average 1.0111940298507462) internal successors, (271), 268 states have internal predecessors, (271), 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) [2024-11-09 07:25:45,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 271 transitions. [2024-11-09 07:25:45,598 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 271 transitions. Word has length 265 [2024-11-09 07:25:45,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:25:45,599 INFO L471 AbstractCegarLoop]: Abstraction has 269 states and 271 transitions. [2024-11-09 07:25:45,599 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 137 states, 137 states have (on average 3.2627737226277373) internal successors, (447), 136 states have internal predecessors, (447), 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) [2024-11-09 07:25:45,599 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 271 transitions. [2024-11-09 07:25:45,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 268 [2024-11-09 07:25:45,601 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:25:45,601 INFO L215 NwaCegarLoop]: trace histogram [44, 44, 44, 44, 43, 43, 1, 1, 1, 1, 1] [2024-11-09 07:25:45,630 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Ended with exit code 0 [2024-11-09 07:25:45,802 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable86 [2024-11-09 07:25:45,802 INFO L396 AbstractCegarLoop]: === Iteration 88 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:25:45,802 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:25:45,802 INFO L85 PathProgramCache]: Analyzing trace with hash 84697733, now seen corresponding path program 86 times [2024-11-09 07:25:45,802 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:25:45,803 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [331841370] [2024-11-09 07:25:45,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:25:45,803 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:25:45,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:25:48,301 INFO L134 CoverageAnalysis]: Checked inductivity of 5677 backedges. 1849 proven. 3828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:25:48,302 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:25:48,302 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [331841370] [2024-11-09 07:25:48,302 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [331841370] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:25:48,302 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [115841359] [2024-11-09 07:25:48,302 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:25:48,302 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:25:48,302 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:25:48,303 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:25:48,304 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2024-11-09 07:25:48,823 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2024-11-09 07:25:48,823 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:25:48,829 INFO L255 TraceCheckSpWp]: Trace formula consists of 772 conjuncts, 94 conjuncts are in the unsatisfiable core [2024-11-09 07:25:48,833 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:25:49,213 INFO L134 CoverageAnalysis]: Checked inductivity of 5677 backedges. 1936 proven. 3741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:25:49,213 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:25:51,249 INFO L134 CoverageAnalysis]: Checked inductivity of 5677 backedges. 1936 proven. 3741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:25:51,249 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [115841359] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:25:51,249 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [921957191] [2024-11-09 07:25:51,250 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:25:51,250 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:25:51,250 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:25:51,250 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:25:51,250 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:25:51,361 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:25:51,906 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '116834#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:25:51,906 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:25:51,906 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:25:51,907 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 49 [2024-11-09 07:25:51,907 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602408123] [2024-11-09 07:25:51,907 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:25:51,907 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2024-11-09 07:25:51,907 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:25:51,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2024-11-09 07:25:51,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1117, Invalid=2189, Unknown=0, NotChecked=0, Total=3306 [2024-11-09 07:25:51,908 INFO L87 Difference]: Start difference. First operand 269 states and 271 transitions. Second operand has 50 states, 50 states have (on average 5.44) internal successors, (272), 49 states have internal predecessors, (272), 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) [2024-11-09 07:25:53,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:25:53,366 INFO L93 Difference]: Finished difference Result 282 states and 284 transitions. [2024-11-09 07:25:53,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2024-11-09 07:25:53,367 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 5.44) internal successors, (272), 49 states have internal predecessors, (272), 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 267 [2024-11-09 07:25:53,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:25:53,368 INFO L225 Difference]: With dead ends: 282 [2024-11-09 07:25:53,368 INFO L226 Difference]: Without dead ends: 280 [2024-11-09 07:25:53,369 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 933 GetRequests, 745 SyntacticMatches, 88 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4680 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=3273, Invalid=7029, Unknown=0, NotChecked=0, Total=10302 [2024-11-09 07:25:53,369 INFO L432 NwaCegarLoop]: 51 mSDtfsCounter, 12 mSDsluCounter, 291 mSDsCounter, 0 mSdLazyCounter, 416 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 342 SdHoareTripleChecker+Invalid, 417 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 416 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:25:53,369 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 342 Invalid, 417 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 416 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:25:53,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2024-11-09 07:25:53,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 273. [2024-11-09 07:25:53,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 273 states, 272 states have (on average 1.0110294117647058) internal successors, (275), 272 states have internal predecessors, (275), 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) [2024-11-09 07:25:53,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 275 transitions. [2024-11-09 07:25:53,391 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 275 transitions. Word has length 267 [2024-11-09 07:25:53,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:25:53,391 INFO L471 AbstractCegarLoop]: Abstraction has 273 states and 275 transitions. [2024-11-09 07:25:53,392 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 5.44) internal successors, (272), 49 states have internal predecessors, (272), 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) [2024-11-09 07:25:53,392 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 275 transitions. [2024-11-09 07:25:53,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 272 [2024-11-09 07:25:53,393 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:25:53,394 INFO L215 NwaCegarLoop]: trace histogram [45, 45, 44, 44, 44, 44, 1, 1, 1, 1, 1] [2024-11-09 07:25:53,421 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Forceful destruction successful, exit code 0 [2024-11-09 07:25:53,594 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable87 [2024-11-09 07:25:53,594 INFO L396 AbstractCegarLoop]: === Iteration 89 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:25:53,595 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:25:53,595 INFO L85 PathProgramCache]: Analyzing trace with hash 339959981, now seen corresponding path program 87 times [2024-11-09 07:25:53,595 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:25:53,595 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [872528165] [2024-11-09 07:25:53,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:25:53,595 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:25:53,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:25:58,073 INFO L134 CoverageAnalysis]: Checked inductivity of 5852 backedges. 3743 proven. 2109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:25:58,073 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:25:58,074 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [872528165] [2024-11-09 07:25:58,074 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [872528165] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:25:58,074 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1483660083] [2024-11-09 07:25:58,074 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:25:58,074 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:25:58,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:25:58,075 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:25:58,076 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Waiting until timeout for monitored process [2024-11-09 07:25:58,531 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:25:58,532 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:25:58,538 INFO L255 TraceCheckSpWp]: Trace formula consists of 783 conjuncts, 92 conjuncts are in the unsatisfiable core [2024-11-09 07:25:58,541 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:26:02,873 INFO L134 CoverageAnalysis]: Checked inductivity of 5852 backedges. 3916 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:26:02,873 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:26:05,966 INFO L134 CoverageAnalysis]: Checked inductivity of 5852 backedges. 3916 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:26:05,966 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1483660083] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:26:05,966 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [167254325] [2024-11-09 07:26:05,967 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:26:05,967 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:26:05,967 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:26:05,968 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:26:05,968 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:26:06,113 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:26:07,216 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '119426#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:26:07,216 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:26:07,217 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:26:07,217 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92, 92] total 139 [2024-11-09 07:26:07,217 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053689102] [2024-11-09 07:26:07,217 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:26:07,217 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 140 states [2024-11-09 07:26:07,217 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:26:07,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2024-11-09 07:26:07,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4444, Invalid=17312, Unknown=0, NotChecked=0, Total=21756 [2024-11-09 07:26:07,220 INFO L87 Difference]: Start difference. First operand 273 states and 275 transitions. Second operand has 140 states, 140 states have (on average 3.2642857142857142) internal successors, (457), 139 states have internal predecessors, (457), 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) [2024-11-09 07:26:08,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:26:08,147 INFO L93 Difference]: Finished difference Result 459 states and 463 transitions. [2024-11-09 07:26:08,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2024-11-09 07:26:08,147 INFO L78 Accepts]: Start accepts. Automaton has has 140 states, 140 states have (on average 3.2642857142857142) internal successors, (457), 139 states have internal predecessors, (457), 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 271 [2024-11-09 07:26:08,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:26:08,149 INFO L225 Difference]: With dead ends: 459 [2024-11-09 07:26:08,149 INFO L226 Difference]: Without dead ends: 275 [2024-11-09 07:26:08,150 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 903 GetRequests, 668 SyntacticMatches, 89 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13860 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=4444, Invalid=17312, Unknown=0, NotChecked=0, Total=21756 [2024-11-09 07:26:08,150 INFO L432 NwaCegarLoop]: 47 mSDtfsCounter, 1 mSDsluCounter, 347 mSDsCounter, 0 mSdLazyCounter, 1244 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 394 SdHoareTripleChecker+Invalid, 1245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-11-09 07:26:08,150 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 394 Invalid, 1245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1244 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2024-11-09 07:26:08,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2024-11-09 07:26:08,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 275. [2024-11-09 07:26:08,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 275 states, 274 states have (on average 1.010948905109489) internal successors, (277), 274 states have internal predecessors, (277), 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) [2024-11-09 07:26:08,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 277 transitions. [2024-11-09 07:26:08,178 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 277 transitions. Word has length 271 [2024-11-09 07:26:08,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:26:08,178 INFO L471 AbstractCegarLoop]: Abstraction has 275 states and 277 transitions. [2024-11-09 07:26:08,179 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 140 states, 140 states have (on average 3.2642857142857142) internal successors, (457), 139 states have internal predecessors, (457), 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) [2024-11-09 07:26:08,179 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 277 transitions. [2024-11-09 07:26:08,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 274 [2024-11-09 07:26:08,180 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:26:08,180 INFO L215 NwaCegarLoop]: trace histogram [45, 45, 45, 45, 44, 44, 1, 1, 1, 1, 1] [2024-11-09 07:26:08,205 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Ended with exit code 0 [2024-11-09 07:26:08,381 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable88,89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:26:08,381 INFO L396 AbstractCegarLoop]: === Iteration 90 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:26:08,381 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:26:08,381 INFO L85 PathProgramCache]: Analyzing trace with hash 1617040050, now seen corresponding path program 88 times [2024-11-09 07:26:08,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:26:08,382 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1792764093] [2024-11-09 07:26:08,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:26:08,382 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:26:08,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:26:11,178 INFO L134 CoverageAnalysis]: Checked inductivity of 5941 backedges. 1936 proven. 4005 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:26:11,178 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:26:11,178 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1792764093] [2024-11-09 07:26:11,178 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1792764093] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:26:11,178 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [163459329] [2024-11-09 07:26:11,179 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:26:11,179 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:26:11,179 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:26:11,180 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:26:11,180 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Waiting until timeout for monitored process [2024-11-09 07:26:11,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:26:11,600 INFO L255 TraceCheckSpWp]: Trace formula consists of 789 conjuncts, 93 conjuncts are in the unsatisfiable core [2024-11-09 07:26:11,603 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:26:11,960 INFO L134 CoverageAnalysis]: Checked inductivity of 5941 backedges. 2025 proven. 3916 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:26:11,961 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:26:14,225 INFO L134 CoverageAnalysis]: Checked inductivity of 5941 backedges. 2025 proven. 3916 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:26:14,225 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [163459329] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:26:14,225 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2027951249] [2024-11-09 07:26:14,226 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:26:14,226 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:26:14,226 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:26:14,226 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:26:14,227 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:26:14,354 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:26:14,961 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '122079#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:26:14,961 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:26:14,961 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:26:14,962 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 50 [2024-11-09 07:26:14,962 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1697626675] [2024-11-09 07:26:14,962 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:26:14,963 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2024-11-09 07:26:14,963 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:26:14,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2024-11-09 07:26:14,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1164, Invalid=2258, Unknown=0, NotChecked=0, Total=3422 [2024-11-09 07:26:14,964 INFO L87 Difference]: Start difference. First operand 275 states and 277 transitions. Second operand has 51 states, 51 states have (on average 5.450980392156863) internal successors, (278), 50 states have internal predecessors, (278), 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) [2024-11-09 07:26:16,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:26:16,291 INFO L93 Difference]: Finished difference Result 288 states and 290 transitions. [2024-11-09 07:26:16,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2024-11-09 07:26:16,292 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 5.450980392156863) internal successors, (278), 50 states have internal predecessors, (278), 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 273 [2024-11-09 07:26:16,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:26:16,293 INFO L225 Difference]: With dead ends: 288 [2024-11-09 07:26:16,293 INFO L226 Difference]: Without dead ends: 286 [2024-11-09 07:26:16,294 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 954 GetRequests, 761 SyntacticMatches, 91 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4921 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=3414, Invalid=7298, Unknown=0, NotChecked=0, Total=10712 [2024-11-09 07:26:16,295 INFO L432 NwaCegarLoop]: 52 mSDtfsCounter, 13 mSDsluCounter, 312 mSDsCounter, 0 mSdLazyCounter, 438 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 364 SdHoareTripleChecker+Invalid, 439 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 438 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:26:16,295 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 364 Invalid, 439 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 438 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:26:16,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2024-11-09 07:26:16,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 279. [2024-11-09 07:26:16,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 278 states have (on average 1.0107913669064748) internal successors, (281), 278 states have internal predecessors, (281), 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) [2024-11-09 07:26:16,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 281 transitions. [2024-11-09 07:26:16,317 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 281 transitions. Word has length 273 [2024-11-09 07:26:16,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:26:16,317 INFO L471 AbstractCegarLoop]: Abstraction has 279 states and 281 transitions. [2024-11-09 07:26:16,317 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 5.450980392156863) internal successors, (278), 50 states have internal predecessors, (278), 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) [2024-11-09 07:26:16,317 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 281 transitions. [2024-11-09 07:26:16,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 278 [2024-11-09 07:26:16,318 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:26:16,318 INFO L215 NwaCegarLoop]: trace histogram [46, 46, 45, 45, 45, 45, 1, 1, 1, 1, 1] [2024-11-09 07:26:16,342 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Forceful destruction successful, exit code 0 [2024-11-09 07:26:16,519 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable89,90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:26:16,519 INFO L396 AbstractCegarLoop]: === Iteration 91 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:26:16,519 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:26:16,519 INFO L85 PathProgramCache]: Analyzing trace with hash 1874539098, now seen corresponding path program 89 times [2024-11-09 07:26:16,519 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:26:16,519 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404644036] [2024-11-09 07:26:16,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:26:16,520 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:26:16,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:26:21,630 INFO L134 CoverageAnalysis]: Checked inductivity of 6120 backedges. 3918 proven. 2202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:26:21,630 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:26:21,630 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404644036] [2024-11-09 07:26:21,630 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [404644036] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:26:21,630 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [626510250] [2024-11-09 07:26:21,630 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:26:21,630 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:26:21,630 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:26:21,631 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:26:21,632 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Waiting until timeout for monitored process [2024-11-09 07:26:22,100 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2024-11-09 07:26:22,100 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:26:22,105 INFO L255 TraceCheckSpWp]: Trace formula consists of 800 conjuncts, 94 conjuncts are in the unsatisfiable core [2024-11-09 07:26:22,109 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:26:27,202 INFO L134 CoverageAnalysis]: Checked inductivity of 6120 backedges. 4095 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:26:27,202 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:26:31,091 INFO L134 CoverageAnalysis]: Checked inductivity of 6120 backedges. 4095 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:26:31,092 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [626510250] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:26:31,092 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [703593975] [2024-11-09 07:26:31,093 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:26:31,093 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:26:31,093 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:26:31,093 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:26:31,093 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:26:31,240 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:26:32,380 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '124728#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:26:32,381 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:26:32,381 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:26:32,381 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [94, 94, 94] total 142 [2024-11-09 07:26:32,381 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755325785] [2024-11-09 07:26:32,381 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:26:32,382 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 143 states [2024-11-09 07:26:32,382 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:26:32,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2024-11-09 07:26:32,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4634, Invalid=18016, Unknown=0, NotChecked=0, Total=22650 [2024-11-09 07:26:32,384 INFO L87 Difference]: Start difference. First operand 279 states and 281 transitions. Second operand has 143 states, 143 states have (on average 3.265734265734266) internal successors, (467), 142 states have internal predecessors, (467), 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) [2024-11-09 07:26:33,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:26:33,774 INFO L93 Difference]: Finished difference Result 469 states and 473 transitions. [2024-11-09 07:26:33,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2024-11-09 07:26:33,775 INFO L78 Accepts]: Start accepts. Automaton has has 143 states, 143 states have (on average 3.265734265734266) internal successors, (467), 142 states have internal predecessors, (467), 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 277 [2024-11-09 07:26:33,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:26:33,776 INFO L225 Difference]: With dead ends: 469 [2024-11-09 07:26:33,777 INFO L226 Difference]: Without dead ends: 281 [2024-11-09 07:26:33,778 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 923 GetRequests, 683 SyntacticMatches, 91 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14444 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=4634, Invalid=18016, Unknown=0, NotChecked=0, Total=22650 [2024-11-09 07:26:33,778 INFO L432 NwaCegarLoop]: 48 mSDtfsCounter, 1 mSDsluCounter, 502 mSDsCounter, 0 mSdLazyCounter, 1704 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 550 SdHoareTripleChecker+Invalid, 1705 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1704 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2024-11-09 07:26:33,778 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 550 Invalid, 1705 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1704 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2024-11-09 07:26:33,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2024-11-09 07:26:33,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 281. [2024-11-09 07:26:33,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 281 states, 280 states have (on average 1.0107142857142857) internal successors, (283), 280 states have internal predecessors, (283), 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) [2024-11-09 07:26:33,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 281 states to 281 states and 283 transitions. [2024-11-09 07:26:33,796 INFO L78 Accepts]: Start accepts. Automaton has 281 states and 283 transitions. Word has length 277 [2024-11-09 07:26:33,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:26:33,796 INFO L471 AbstractCegarLoop]: Abstraction has 281 states and 283 transitions. [2024-11-09 07:26:33,796 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 143 states, 143 states have (on average 3.265734265734266) internal successors, (467), 142 states have internal predecessors, (467), 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) [2024-11-09 07:26:33,796 INFO L276 IsEmpty]: Start isEmpty. Operand 281 states and 283 transitions. [2024-11-09 07:26:33,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 280 [2024-11-09 07:26:33,797 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:26:33,798 INFO L215 NwaCegarLoop]: trace histogram [46, 46, 46, 46, 45, 45, 1, 1, 1, 1, 1] [2024-11-09 07:26:33,814 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Forceful destruction successful, exit code 0 [2024-11-09 07:26:33,998 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:26:33,998 INFO L396 AbstractCegarLoop]: === Iteration 92 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:26:33,998 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:26:33,999 INFO L85 PathProgramCache]: Analyzing trace with hash -888435553, now seen corresponding path program 90 times [2024-11-09 07:26:33,999 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:26:33,999 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1313137470] [2024-11-09 07:26:33,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:26:33,999 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:26:34,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:26:36,965 INFO L134 CoverageAnalysis]: Checked inductivity of 6211 backedges. 2025 proven. 4186 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:26:36,965 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:26:36,965 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1313137470] [2024-11-09 07:26:36,965 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1313137470] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:26:36,965 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1113528099] [2024-11-09 07:26:36,965 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:26:36,965 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:26:36,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:26:36,967 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:26:36,968 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Waiting until timeout for monitored process [2024-11-09 07:26:37,412 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:26:37,412 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:26:37,418 INFO L255 TraceCheckSpWp]: Trace formula consists of 806 conjuncts, 98 conjuncts are in the unsatisfiable core [2024-11-09 07:26:37,421 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:26:37,793 INFO L134 CoverageAnalysis]: Checked inductivity of 6211 backedges. 2116 proven. 4095 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:26:37,794 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:26:40,441 INFO L134 CoverageAnalysis]: Checked inductivity of 6211 backedges. 2116 proven. 4095 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:26:40,441 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1113528099] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:26:40,441 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [442760607] [2024-11-09 07:26:40,443 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:26:40,443 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:26:40,443 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:26:40,443 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:26:40,443 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:26:40,588 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:26:41,308 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '127439#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:26:41,308 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:26:41,309 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:26:41,309 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 51 [2024-11-09 07:26:41,309 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188709380] [2024-11-09 07:26:41,309 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:26:41,310 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2024-11-09 07:26:41,310 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:26:41,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2024-11-09 07:26:41,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1212, Invalid=2328, Unknown=0, NotChecked=0, Total=3540 [2024-11-09 07:26:41,311 INFO L87 Difference]: Start difference. First operand 281 states and 283 transitions. Second operand has 52 states, 52 states have (on average 5.461538461538462) internal successors, (284), 51 states have internal predecessors, (284), 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) [2024-11-09 07:26:42,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:26:42,927 INFO L93 Difference]: Finished difference Result 294 states and 296 transitions. [2024-11-09 07:26:42,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2024-11-09 07:26:42,928 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 5.461538461538462) internal successors, (284), 51 states have internal predecessors, (284), 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 279 [2024-11-09 07:26:42,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:26:42,930 INFO L225 Difference]: With dead ends: 294 [2024-11-09 07:26:42,930 INFO L226 Difference]: Without dead ends: 292 [2024-11-09 07:26:42,932 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 975 GetRequests, 779 SyntacticMatches, 92 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5076 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=3558, Invalid=7572, Unknown=0, NotChecked=0, Total=11130 [2024-11-09 07:26:42,932 INFO L432 NwaCegarLoop]: 53 mSDtfsCounter, 13 mSDsluCounter, 333 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 386 SdHoareTripleChecker+Invalid, 463 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-09 07:26:42,933 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 386 Invalid, 463 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 462 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-09 07:26:42,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2024-11-09 07:26:42,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 285. [2024-11-09 07:26:42,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 285 states, 284 states have (on average 1.0105633802816902) internal successors, (287), 284 states have internal predecessors, (287), 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) [2024-11-09 07:26:42,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 285 states to 285 states and 287 transitions. [2024-11-09 07:26:42,968 INFO L78 Accepts]: Start accepts. Automaton has 285 states and 287 transitions. Word has length 279 [2024-11-09 07:26:42,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:26:42,969 INFO L471 AbstractCegarLoop]: Abstraction has 285 states and 287 transitions. [2024-11-09 07:26:42,969 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 5.461538461538462) internal successors, (284), 51 states have internal predecessors, (284), 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) [2024-11-09 07:26:42,969 INFO L276 IsEmpty]: Start isEmpty. Operand 285 states and 287 transitions. [2024-11-09 07:26:42,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 284 [2024-11-09 07:26:42,971 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:26:42,971 INFO L215 NwaCegarLoop]: trace histogram [47, 47, 46, 46, 46, 46, 1, 1, 1, 1, 1] [2024-11-09 07:26:43,000 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Forceful destruction successful, exit code 0 [2024-11-09 07:26:43,172 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91,92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:26:43,172 INFO L396 AbstractCegarLoop]: === Iteration 93 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:26:43,173 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:26:43,173 INFO L85 PathProgramCache]: Analyzing trace with hash 336326087, now seen corresponding path program 91 times [2024-11-09 07:26:43,173 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:26:43,173 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1551815605] [2024-11-09 07:26:43,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:26:43,173 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:26:43,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:26:49,167 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 4097 proven. 2297 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:26:49,167 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:26:49,167 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1551815605] [2024-11-09 07:26:49,167 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1551815605] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:26:49,167 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2034125741] [2024-11-09 07:26:49,168 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:26:49,168 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:26:49,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:26:49,169 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:26:49,170 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Waiting until timeout for monitored process [2024-11-09 07:26:49,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:26:49,667 INFO L255 TraceCheckSpWp]: Trace formula consists of 817 conjuncts, 96 conjuncts are in the unsatisfiable core [2024-11-09 07:26:49,671 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:26:55,410 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 4278 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:26:55,410 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:26:59,516 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 4278 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:26:59,517 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2034125741] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:26:59,517 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [696517080] [2024-11-09 07:26:59,518 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:26:59,518 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:26:59,518 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:26:59,518 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:26:59,518 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:26:59,659 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:27:00,983 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '130145#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:27:00,984 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:27:00,984 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:27:00,984 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96, 96] total 145 [2024-11-09 07:27:00,984 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768613950] [2024-11-09 07:27:00,984 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:27:00,985 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 146 states [2024-11-09 07:27:00,985 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:27:00,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2024-11-09 07:27:00,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4828, Invalid=18734, Unknown=0, NotChecked=0, Total=23562 [2024-11-09 07:27:00,989 INFO L87 Difference]: Start difference. First operand 285 states and 287 transitions. Second operand has 146 states, 146 states have (on average 3.267123287671233) internal successors, (477), 145 states have internal predecessors, (477), 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) [2024-11-09 07:27:02,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:27:02,602 INFO L93 Difference]: Finished difference Result 479 states and 483 transitions. [2024-11-09 07:27:02,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2024-11-09 07:27:02,602 INFO L78 Accepts]: Start accepts. Automaton has has 146 states, 146 states have (on average 3.267123287671233) internal successors, (477), 145 states have internal predecessors, (477), 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 283 [2024-11-09 07:27:02,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:27:02,604 INFO L225 Difference]: With dead ends: 479 [2024-11-09 07:27:02,604 INFO L226 Difference]: Without dead ends: 287 [2024-11-09 07:27:02,605 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 943 GetRequests, 698 SyntacticMatches, 93 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15040 ImplicationChecksByTransitivity, 13.8s TimeCoverageRelationStatistics Valid=4828, Invalid=18734, Unknown=0, NotChecked=0, Total=23562 [2024-11-09 07:27:02,606 INFO L432 NwaCegarLoop]: 49 mSDtfsCounter, 1 mSDsluCounter, 593 mSDsCounter, 0 mSdLazyCounter, 1958 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 642 SdHoareTripleChecker+Invalid, 1959 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1958 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:27:02,606 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 642 Invalid, 1959 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1958 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2024-11-09 07:27:02,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2024-11-09 07:27:02,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 287. [2024-11-09 07:27:02,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 287 states, 286 states have (on average 1.0104895104895104) internal successors, (289), 286 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:27:02,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 289 transitions. [2024-11-09 07:27:02,661 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 289 transitions. Word has length 283 [2024-11-09 07:27:02,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:27:02,662 INFO L471 AbstractCegarLoop]: Abstraction has 287 states and 289 transitions. [2024-11-09 07:27:02,662 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 146 states, 146 states have (on average 3.267123287671233) internal successors, (477), 145 states have internal predecessors, (477), 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) [2024-11-09 07:27:02,662 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 289 transitions. [2024-11-09 07:27:02,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2024-11-09 07:27:02,664 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:27:02,664 INFO L215 NwaCegarLoop]: trace histogram [47, 47, 47, 47, 46, 46, 1, 1, 1, 1, 1] [2024-11-09 07:27:02,692 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Ended with exit code 0 [2024-11-09 07:27:02,865 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:27:02,865 INFO L396 AbstractCegarLoop]: === Iteration 94 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:27:02,865 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:27:02,865 INFO L85 PathProgramCache]: Analyzing trace with hash -432095156, now seen corresponding path program 92 times [2024-11-09 07:27:02,865 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:27:02,866 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [565554633] [2024-11-09 07:27:02,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:27:02,866 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:27:02,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:27:06,197 INFO L134 CoverageAnalysis]: Checked inductivity of 6487 backedges. 2116 proven. 4371 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:27:06,198 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:27:06,198 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [565554633] [2024-11-09 07:27:06,198 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [565554633] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:27:06,198 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [703640844] [2024-11-09 07:27:06,198 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:27:06,198 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:27:06,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:27:06,199 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:27:06,201 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Waiting until timeout for monitored process [2024-11-09 07:27:06,795 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2024-11-09 07:27:06,795 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:27:06,802 INFO L255 TraceCheckSpWp]: Trace formula consists of 823 conjuncts, 100 conjuncts are in the unsatisfiable core [2024-11-09 07:27:06,805 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:27:07,247 INFO L134 CoverageAnalysis]: Checked inductivity of 6487 backedges. 2209 proven. 4278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:27:07,248 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:27:09,982 INFO L134 CoverageAnalysis]: Checked inductivity of 6487 backedges. 2209 proven. 4278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:27:09,983 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [703640844] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:27:09,983 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [279475442] [2024-11-09 07:27:09,984 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:27:09,984 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:27:09,984 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:27:09,984 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:27:09,984 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:27:10,126 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:27:10,825 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '132914#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:27:10,825 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:27:10,826 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:27:10,826 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 52 [2024-11-09 07:27:10,826 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400979006] [2024-11-09 07:27:10,826 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:27:10,827 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2024-11-09 07:27:10,827 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:27:10,828 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2024-11-09 07:27:10,828 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1261, Invalid=2399, Unknown=0, NotChecked=0, Total=3660 [2024-11-09 07:27:10,829 INFO L87 Difference]: Start difference. First operand 287 states and 289 transitions. Second operand has 53 states, 53 states have (on average 5.471698113207547) internal successors, (290), 52 states have internal predecessors, (290), 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) [2024-11-09 07:27:12,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:27:12,362 INFO L93 Difference]: Finished difference Result 300 states and 302 transitions. [2024-11-09 07:27:12,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2024-11-09 07:27:12,363 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 5.471698113207547) internal successors, (290), 52 states have internal predecessors, (290), 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 285 [2024-11-09 07:27:12,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:27:12,365 INFO L225 Difference]: With dead ends: 300 [2024-11-09 07:27:12,365 INFO L226 Difference]: Without dead ends: 298 [2024-11-09 07:27:12,366 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 996 GetRequests, 796 SyntacticMatches, 94 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5280 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=3705, Invalid=7851, Unknown=0, NotChecked=0, Total=11556 [2024-11-09 07:27:12,366 INFO L432 NwaCegarLoop]: 54 mSDtfsCounter, 17 mSDsluCounter, 310 mSDsCounter, 0 mSdLazyCounter, 444 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 364 SdHoareTripleChecker+Invalid, 445 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:27:12,366 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 364 Invalid, 445 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 444 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:27:12,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2024-11-09 07:27:12,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 291. [2024-11-09 07:27:12,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 291 states, 290 states have (on average 1.0103448275862068) internal successors, (293), 290 states have internal predecessors, (293), 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) [2024-11-09 07:27:12,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 293 transitions. [2024-11-09 07:27:12,387 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 293 transitions. Word has length 285 [2024-11-09 07:27:12,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:27:12,387 INFO L471 AbstractCegarLoop]: Abstraction has 291 states and 293 transitions. [2024-11-09 07:27:12,387 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 5.471698113207547) internal successors, (290), 52 states have internal predecessors, (290), 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) [2024-11-09 07:27:12,387 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 293 transitions. [2024-11-09 07:27:12,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 290 [2024-11-09 07:27:12,388 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:27:12,388 INFO L215 NwaCegarLoop]: trace histogram [48, 48, 47, 47, 47, 47, 1, 1, 1, 1, 1] [2024-11-09 07:27:12,407 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Forceful destruction successful, exit code 0 [2024-11-09 07:27:12,589 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable93,94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:27:12,589 INFO L396 AbstractCegarLoop]: === Iteration 95 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:27:12,589 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:27:12,590 INFO L85 PathProgramCache]: Analyzing trace with hash 905151220, now seen corresponding path program 93 times [2024-11-09 07:27:12,590 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:27:12,590 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [973750382] [2024-11-09 07:27:12,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:27:12,590 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:27:12,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:27:18,794 INFO L134 CoverageAnalysis]: Checked inductivity of 6674 backedges. 4280 proven. 2394 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:27:18,794 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:27:18,794 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [973750382] [2024-11-09 07:27:18,794 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [973750382] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:27:18,794 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1455391906] [2024-11-09 07:27:18,795 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:27:18,795 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:27:18,795 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:27:18,796 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:27:18,797 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Waiting until timeout for monitored process [2024-11-09 07:27:19,322 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:27:19,323 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:27:19,330 INFO L255 TraceCheckSpWp]: Trace formula consists of 834 conjuncts, 98 conjuncts are in the unsatisfiable core [2024-11-09 07:27:19,333 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:27:24,597 INFO L134 CoverageAnalysis]: Checked inductivity of 6674 backedges. 4465 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:27:24,597 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:27:28,945 INFO L134 CoverageAnalysis]: Checked inductivity of 6674 backedges. 4465 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:27:28,945 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1455391906] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:27:28,946 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1989159977] [2024-11-09 07:27:28,946 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:27:28,946 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:27:28,947 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:27:28,947 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:27:28,947 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:27:29,104 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:27:30,452 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '135677#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:27:30,453 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:27:30,453 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:27:30,453 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98, 98] total 148 [2024-11-09 07:27:30,453 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467220483] [2024-11-09 07:27:30,453 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:27:30,454 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 149 states [2024-11-09 07:27:30,454 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:27:30,455 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 149 interpolants. [2024-11-09 07:27:30,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5026, Invalid=19466, Unknown=0, NotChecked=0, Total=24492 [2024-11-09 07:27:30,457 INFO L87 Difference]: Start difference. First operand 291 states and 293 transitions. Second operand has 149 states, 149 states have (on average 3.2684563758389262) internal successors, (487), 148 states have internal predecessors, (487), 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) [2024-11-09 07:27:31,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:27:31,651 INFO L93 Difference]: Finished difference Result 489 states and 493 transitions. [2024-11-09 07:27:31,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2024-11-09 07:27:31,652 INFO L78 Accepts]: Start accepts. Automaton has has 149 states, 149 states have (on average 3.2684563758389262) internal successors, (487), 148 states have internal predecessors, (487), 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 289 [2024-11-09 07:27:31,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:27:31,653 INFO L225 Difference]: With dead ends: 489 [2024-11-09 07:27:31,654 INFO L226 Difference]: Without dead ends: 293 [2024-11-09 07:27:31,655 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 963 GetRequests, 713 SyntacticMatches, 95 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15648 ImplicationChecksByTransitivity, 13.7s TimeCoverageRelationStatistics Valid=5026, Invalid=19466, Unknown=0, NotChecked=0, Total=24492 [2024-11-09 07:27:31,655 INFO L432 NwaCegarLoop]: 50 mSDtfsCounter, 1 mSDsluCounter, 390 mSDsCounter, 0 mSdLazyCounter, 1386 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 440 SdHoareTripleChecker+Invalid, 1387 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2024-11-09 07:27:31,655 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 440 Invalid, 1387 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1386 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2024-11-09 07:27:31,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2024-11-09 07:27:31,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 293. [2024-11-09 07:27:31,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 293 states, 292 states have (on average 1.0102739726027397) internal successors, (295), 292 states have internal predecessors, (295), 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) [2024-11-09 07:27:31,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 295 transitions. [2024-11-09 07:27:31,677 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 295 transitions. Word has length 289 [2024-11-09 07:27:31,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:27:31,677 INFO L471 AbstractCegarLoop]: Abstraction has 293 states and 295 transitions. [2024-11-09 07:27:31,677 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 149 states, 149 states have (on average 3.2684563758389262) internal successors, (487), 148 states have internal predecessors, (487), 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) [2024-11-09 07:27:31,677 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 295 transitions. [2024-11-09 07:27:31,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 292 [2024-11-09 07:27:31,678 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:27:31,678 INFO L215 NwaCegarLoop]: trace histogram [48, 48, 48, 48, 47, 47, 1, 1, 1, 1, 1] [2024-11-09 07:27:31,701 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Ended with exit code 0 [2024-11-09 07:27:31,879 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable94,95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:27:31,879 INFO L396 AbstractCegarLoop]: === Iteration 96 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:27:31,879 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:27:31,879 INFO L85 PathProgramCache]: Analyzing trace with hash 1927126457, now seen corresponding path program 94 times [2024-11-09 07:27:31,879 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:27:31,879 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [829802882] [2024-11-09 07:27:31,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:27:31,880 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:27:31,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:27:35,028 INFO L134 CoverageAnalysis]: Checked inductivity of 6769 backedges. 2209 proven. 4560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:27:35,028 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:27:35,028 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [829802882] [2024-11-09 07:27:35,028 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [829802882] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:27:35,028 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [465414304] [2024-11-09 07:27:35,028 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:27:35,028 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:27:35,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:27:35,029 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:27:35,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Waiting until timeout for monitored process [2024-11-09 07:27:35,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:27:35,477 INFO L255 TraceCheckSpWp]: Trace formula consists of 840 conjuncts, 99 conjuncts are in the unsatisfiable core [2024-11-09 07:27:35,480 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:27:35,896 INFO L134 CoverageAnalysis]: Checked inductivity of 6769 backedges. 2304 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:27:35,896 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:27:38,694 INFO L134 CoverageAnalysis]: Checked inductivity of 6769 backedges. 2304 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:27:38,694 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [465414304] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:27:38,694 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [774677578] [2024-11-09 07:27:38,695 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:27:38,695 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:27:38,695 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:27:38,695 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:27:38,695 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:27:38,811 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:27:39,389 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '138504#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:27:39,389 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:27:39,389 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:27:39,389 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 53 [2024-11-09 07:27:39,390 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [10240231] [2024-11-09 07:27:39,390 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:27:39,390 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2024-11-09 07:27:39,390 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:27:39,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2024-11-09 07:27:39,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1311, Invalid=2471, Unknown=0, NotChecked=0, Total=3782 [2024-11-09 07:27:39,391 INFO L87 Difference]: Start difference. First operand 293 states and 295 transitions. Second operand has 54 states, 54 states have (on average 5.481481481481482) internal successors, (296), 53 states have internal predecessors, (296), 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) [2024-11-09 07:27:40,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:27:40,857 INFO L93 Difference]: Finished difference Result 306 states and 308 transitions. [2024-11-09 07:27:40,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2024-11-09 07:27:40,857 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 5.481481481481482) internal successors, (296), 53 states have internal predecessors, (296), 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 291 [2024-11-09 07:27:40,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:27:40,860 INFO L225 Difference]: With dead ends: 306 [2024-11-09 07:27:40,860 INFO L226 Difference]: Without dead ends: 304 [2024-11-09 07:27:40,861 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 1017 GetRequests, 812 SyntacticMatches, 97 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5536 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=3855, Invalid=8135, Unknown=0, NotChecked=0, Total=11990 [2024-11-09 07:27:40,861 INFO L432 NwaCegarLoop]: 55 mSDtfsCounter, 17 mSDsluCounter, 300 mSDsCounter, 0 mSdLazyCounter, 439 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 355 SdHoareTripleChecker+Invalid, 440 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 439 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:27:40,861 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 355 Invalid, 440 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 439 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:27:40,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2024-11-09 07:27:40,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 297. [2024-11-09 07:27:40,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 297 states, 296 states have (on average 1.010135135135135) internal successors, (299), 296 states have internal predecessors, (299), 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) [2024-11-09 07:27:40,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 299 transitions. [2024-11-09 07:27:40,882 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 299 transitions. Word has length 291 [2024-11-09 07:27:40,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:27:40,883 INFO L471 AbstractCegarLoop]: Abstraction has 297 states and 299 transitions. [2024-11-09 07:27:40,883 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 5.481481481481482) internal successors, (296), 53 states have internal predecessors, (296), 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) [2024-11-09 07:27:40,883 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 299 transitions. [2024-11-09 07:27:40,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 296 [2024-11-09 07:27:40,884 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:27:40,884 INFO L215 NwaCegarLoop]: trace histogram [49, 49, 48, 48, 48, 48, 1, 1, 1, 1, 1] [2024-11-09 07:27:40,907 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Forceful destruction successful, exit code 0 [2024-11-09 07:27:41,085 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable95 [2024-11-09 07:27:41,085 INFO L396 AbstractCegarLoop]: === Iteration 97 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:27:41,085 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:27:41,085 INFO L85 PathProgramCache]: Analyzing trace with hash 1943790049, now seen corresponding path program 95 times [2024-11-09 07:27:41,086 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:27:41,086 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [764013039] [2024-11-09 07:27:41,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:27:41,086 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:27:41,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:27:47,080 INFO L134 CoverageAnalysis]: Checked inductivity of 6960 backedges. 4467 proven. 2493 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:27:47,080 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:27:47,080 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [764013039] [2024-11-09 07:27:47,081 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [764013039] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:27:47,081 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1099211570] [2024-11-09 07:27:47,081 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:27:47,081 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:27:47,081 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:27:47,082 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:27:47,083 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Waiting until timeout for monitored process [2024-11-09 07:27:47,723 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 49 check-sat command(s) [2024-11-09 07:27:47,724 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:27:47,730 INFO L255 TraceCheckSpWp]: Trace formula consists of 851 conjuncts, 100 conjuncts are in the unsatisfiable core [2024-11-09 07:27:47,734 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:27:53,157 INFO L134 CoverageAnalysis]: Checked inductivity of 6960 backedges. 4656 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:27:53,157 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:27:57,535 INFO L134 CoverageAnalysis]: Checked inductivity of 6960 backedges. 4656 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:27:57,535 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1099211570] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:27:57,536 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [893645744] [2024-11-09 07:27:57,537 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:27:57,537 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:27:57,537 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:27:57,537 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:27:57,537 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:27:57,675 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:27:59,080 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '141324#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:27:59,080 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:27:59,080 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:27:59,081 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 100, 100] total 151 [2024-11-09 07:27:59,081 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966076159] [2024-11-09 07:27:59,081 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:27:59,082 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 152 states [2024-11-09 07:27:59,082 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:27:59,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2024-11-09 07:27:59,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5228, Invalid=20212, Unknown=0, NotChecked=0, Total=25440 [2024-11-09 07:27:59,086 INFO L87 Difference]: Start difference. First operand 297 states and 299 transitions. Second operand has 152 states, 152 states have (on average 3.2697368421052633) internal successors, (497), 151 states have internal predecessors, (497), 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) [2024-11-09 07:28:00,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:28:00,499 INFO L93 Difference]: Finished difference Result 499 states and 503 transitions. [2024-11-09 07:28:00,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2024-11-09 07:28:00,500 INFO L78 Accepts]: Start accepts. Automaton has has 152 states, 152 states have (on average 3.2697368421052633) internal successors, (497), 151 states have internal predecessors, (497), 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 295 [2024-11-09 07:28:00,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:28:00,501 INFO L225 Difference]: With dead ends: 499 [2024-11-09 07:28:00,501 INFO L226 Difference]: Without dead ends: 299 [2024-11-09 07:28:00,502 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 983 GetRequests, 728 SyntacticMatches, 97 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16268 ImplicationChecksByTransitivity, 13.9s TimeCoverageRelationStatistics Valid=5228, Invalid=20212, Unknown=0, NotChecked=0, Total=25440 [2024-11-09 07:28:00,503 INFO L432 NwaCegarLoop]: 51 mSDtfsCounter, 1 mSDsluCounter, 551 mSDsCounter, 0 mSdLazyCounter, 1866 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 602 SdHoareTripleChecker+Invalid, 1867 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1866 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2024-11-09 07:28:00,503 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 602 Invalid, 1867 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1866 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2024-11-09 07:28:00,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2024-11-09 07:28:00,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 299. [2024-11-09 07:28:00,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 299 states, 298 states have (on average 1.0100671140939597) internal successors, (301), 298 states have internal predecessors, (301), 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) [2024-11-09 07:28:00,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 301 transitions. [2024-11-09 07:28:00,519 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 301 transitions. Word has length 295 [2024-11-09 07:28:00,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:28:00,520 INFO L471 AbstractCegarLoop]: Abstraction has 299 states and 301 transitions. [2024-11-09 07:28:00,520 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 152 states, 152 states have (on average 3.2697368421052633) internal successors, (497), 151 states have internal predecessors, (497), 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) [2024-11-09 07:28:00,520 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 301 transitions. [2024-11-09 07:28:00,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2024-11-09 07:28:00,521 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:28:00,521 INFO L215 NwaCegarLoop]: trace histogram [49, 49, 49, 49, 48, 48, 1, 1, 1, 1, 1] [2024-11-09 07:28:00,540 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Ended with exit code 0 [2024-11-09 07:28:00,721 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable96,97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:28:00,721 INFO L396 AbstractCegarLoop]: === Iteration 98 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:28:00,721 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:28:00,721 INFO L85 PathProgramCache]: Analyzing trace with hash -260696858, now seen corresponding path program 96 times [2024-11-09 07:28:00,722 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:28:00,722 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [269074340] [2024-11-09 07:28:00,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:28:00,722 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:28:00,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:28:04,348 INFO L134 CoverageAnalysis]: Checked inductivity of 7057 backedges. 2304 proven. 4753 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:28:04,348 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:28:04,348 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [269074340] [2024-11-09 07:28:04,348 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [269074340] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:28:04,349 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1020540885] [2024-11-09 07:28:04,349 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:28:04,349 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:28:04,349 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:28:04,350 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:28:04,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Waiting until timeout for monitored process [2024-11-09 07:28:04,921 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:28:04,921 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:28:04,928 INFO L255 TraceCheckSpWp]: Trace formula consists of 857 conjuncts, 104 conjuncts are in the unsatisfiable core [2024-11-09 07:28:04,932 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:28:05,364 INFO L134 CoverageAnalysis]: Checked inductivity of 7057 backedges. 2401 proven. 4656 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:28:05,365 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:28:08,282 INFO L134 CoverageAnalysis]: Checked inductivity of 7057 backedges. 2401 proven. 4656 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:28:08,282 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1020540885] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:28:08,282 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2098401828] [2024-11-09 07:28:08,283 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:28:08,283 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:28:08,284 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:28:08,284 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:28:08,284 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:28:08,418 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:28:09,127 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '144209#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:28:09,127 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:28:09,127 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:28:09,127 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 54 [2024-11-09 07:28:09,128 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997305803] [2024-11-09 07:28:09,128 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:28:09,128 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2024-11-09 07:28:09,128 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:28:09,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2024-11-09 07:28:09,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1362, Invalid=2544, Unknown=0, NotChecked=0, Total=3906 [2024-11-09 07:28:09,129 INFO L87 Difference]: Start difference. First operand 299 states and 301 transitions. Second operand has 55 states, 55 states have (on average 5.490909090909091) internal successors, (302), 54 states have internal predecessors, (302), 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) [2024-11-09 07:28:10,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:28:10,780 INFO L93 Difference]: Finished difference Result 312 states and 314 transitions. [2024-11-09 07:28:10,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2024-11-09 07:28:10,780 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 5.490909090909091) internal successors, (302), 54 states have internal predecessors, (302), 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 297 [2024-11-09 07:28:10,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:28:10,782 INFO L225 Difference]: With dead ends: 312 [2024-11-09 07:28:10,782 INFO L226 Difference]: Without dead ends: 310 [2024-11-09 07:28:10,783 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 1038 GetRequests, 830 SyntacticMatches, 98 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5700 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=4008, Invalid=8424, Unknown=0, NotChecked=0, Total=12432 [2024-11-09 07:28:10,783 INFO L432 NwaCegarLoop]: 56 mSDtfsCounter, 16 mSDsluCounter, 335 mSDsCounter, 0 mSdLazyCounter, 469 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 391 SdHoareTripleChecker+Invalid, 470 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 469 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:28:10,784 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 391 Invalid, 470 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 469 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:28:10,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2024-11-09 07:28:10,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 303. [2024-11-09 07:28:10,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 303 states, 302 states have (on average 1.009933774834437) internal successors, (305), 302 states have internal predecessors, (305), 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) [2024-11-09 07:28:10,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 303 states to 303 states and 305 transitions. [2024-11-09 07:28:10,805 INFO L78 Accepts]: Start accepts. Automaton has 303 states and 305 transitions. Word has length 297 [2024-11-09 07:28:10,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:28:10,805 INFO L471 AbstractCegarLoop]: Abstraction has 303 states and 305 transitions. [2024-11-09 07:28:10,805 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 5.490909090909091) internal successors, (302), 54 states have internal predecessors, (302), 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) [2024-11-09 07:28:10,806 INFO L276 IsEmpty]: Start isEmpty. Operand 303 states and 305 transitions. [2024-11-09 07:28:10,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 302 [2024-11-09 07:28:10,807 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:28:10,807 INFO L215 NwaCegarLoop]: trace histogram [50, 50, 49, 49, 49, 49, 1, 1, 1, 1, 1] [2024-11-09 07:28:10,828 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Ended with exit code 0 [2024-11-09 07:28:11,007 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable97,98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:28:11,007 INFO L396 AbstractCegarLoop]: === Iteration 99 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:28:11,008 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:28:11,008 INFO L85 PathProgramCache]: Analyzing trace with hash -186975602, now seen corresponding path program 97 times [2024-11-09 07:28:11,008 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:28:11,008 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [975516766] [2024-11-09 07:28:11,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:28:11,008 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:28:11,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:28:17,613 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 4658 proven. 2594 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:28:17,613 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:28:17,613 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [975516766] [2024-11-09 07:28:17,614 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [975516766] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:28:17,614 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1686028022] [2024-11-09 07:28:17,614 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:28:17,614 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:28:17,614 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:28:17,615 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:28:17,616 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Waiting until timeout for monitored process [2024-11-09 07:28:18,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:28:18,165 INFO L255 TraceCheckSpWp]: Trace formula consists of 868 conjuncts, 102 conjuncts are in the unsatisfiable core [2024-11-09 07:28:18,169 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:28:24,220 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 4851 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:28:24,220 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:28:28,850 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 4851 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:28:28,850 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1686028022] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:28:28,850 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2027332625] [2024-11-09 07:28:28,851 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:28:28,851 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:28:28,852 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:28:28,852 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:28:28,852 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:28:28,994 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:28:30,373 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '147086#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:28:30,373 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:28:30,373 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:28:30,373 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 102, 102] total 154 [2024-11-09 07:28:30,373 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134555824] [2024-11-09 07:28:30,374 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:28:30,374 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 155 states [2024-11-09 07:28:30,374 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:28:30,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2024-11-09 07:28:30,378 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5434, Invalid=20972, Unknown=0, NotChecked=0, Total=26406 [2024-11-09 07:28:30,379 INFO L87 Difference]: Start difference. First operand 303 states and 305 transitions. Second operand has 155 states, 155 states have (on average 3.270967741935484) internal successors, (507), 154 states have internal predecessors, (507), 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) [2024-11-09 07:28:31,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:28:31,731 INFO L93 Difference]: Finished difference Result 509 states and 513 transitions. [2024-11-09 07:28:31,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2024-11-09 07:28:31,731 INFO L78 Accepts]: Start accepts. Automaton has has 155 states, 155 states have (on average 3.270967741935484) internal successors, (507), 154 states have internal predecessors, (507), 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 301 [2024-11-09 07:28:31,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:28:31,733 INFO L225 Difference]: With dead ends: 509 [2024-11-09 07:28:31,733 INFO L226 Difference]: Without dead ends: 305 [2024-11-09 07:28:31,735 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 1003 GetRequests, 743 SyntacticMatches, 99 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16900 ImplicationChecksByTransitivity, 15.2s TimeCoverageRelationStatistics Valid=5434, Invalid=20972, Unknown=0, NotChecked=0, Total=26406 [2024-11-09 07:28:31,735 INFO L432 NwaCegarLoop]: 52 mSDtfsCounter, 1 mSDsluCounter, 458 mSDsCounter, 0 mSdLazyCounter, 1592 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 510 SdHoareTripleChecker+Invalid, 1593 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1592 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2024-11-09 07:28:31,735 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 510 Invalid, 1593 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1592 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2024-11-09 07:28:31,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2024-11-09 07:28:31,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 305. [2024-11-09 07:28:31,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 305 states, 304 states have (on average 1.0098684210526316) internal successors, (307), 304 states have internal predecessors, (307), 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) [2024-11-09 07:28:31,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 307 transitions. [2024-11-09 07:28:31,754 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 307 transitions. Word has length 301 [2024-11-09 07:28:31,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:28:31,754 INFO L471 AbstractCegarLoop]: Abstraction has 305 states and 307 transitions. [2024-11-09 07:28:31,754 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 155 states, 155 states have (on average 3.270967741935484) internal successors, (507), 154 states have internal predecessors, (507), 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) [2024-11-09 07:28:31,754 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 307 transitions. [2024-11-09 07:28:31,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 304 [2024-11-09 07:28:31,755 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:28:31,756 INFO L215 NwaCegarLoop]: trace histogram [50, 50, 50, 50, 49, 49, 1, 1, 1, 1, 1] [2024-11-09 07:28:31,770 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Forceful destruction successful, exit code 0 [2024-11-09 07:28:31,956 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable98,99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:28:31,956 INFO L396 AbstractCegarLoop]: === Iteration 100 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:28:31,956 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:28:31,956 INFO L85 PathProgramCache]: Analyzing trace with hash -62777901, now seen corresponding path program 98 times [2024-11-09 07:28:31,956 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:28:31,957 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [588001951] [2024-11-09 07:28:31,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:28:31,957 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:28:31,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:28:35,420 INFO L134 CoverageAnalysis]: Checked inductivity of 7351 backedges. 2401 proven. 4950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:28:35,421 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:28:35,421 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [588001951] [2024-11-09 07:28:35,421 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [588001951] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:28:35,421 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [570812215] [2024-11-09 07:28:35,421 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:28:35,421 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:28:35,421 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:28:35,422 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:28:35,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Waiting until timeout for monitored process [2024-11-09 07:28:36,137 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 51 check-sat command(s) [2024-11-09 07:28:36,137 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:28:36,144 INFO L255 TraceCheckSpWp]: Trace formula consists of 874 conjuncts, 106 conjuncts are in the unsatisfiable core [2024-11-09 07:28:36,148 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:28:36,571 INFO L134 CoverageAnalysis]: Checked inductivity of 7351 backedges. 2500 proven. 4851 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:28:36,571 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:28:39,659 INFO L134 CoverageAnalysis]: Checked inductivity of 7351 backedges. 2500 proven. 4851 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:28:39,659 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [570812215] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:28:39,660 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1235952456] [2024-11-09 07:28:39,660 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:28:39,660 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:28:39,661 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:28:39,661 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:28:39,661 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:28:39,811 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:28:40,421 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '150029#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:28:40,421 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:28:40,421 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:28:40,421 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 55 [2024-11-09 07:28:40,421 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1310948204] [2024-11-09 07:28:40,421 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:28:40,422 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2024-11-09 07:28:40,422 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:28:40,423 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2024-11-09 07:28:40,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1414, Invalid=2618, Unknown=0, NotChecked=0, Total=4032 [2024-11-09 07:28:40,423 INFO L87 Difference]: Start difference. First operand 305 states and 307 transitions. Second operand has 56 states, 56 states have (on average 5.5) internal successors, (308), 55 states have internal predecessors, (308), 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) [2024-11-09 07:28:42,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:28:42,010 INFO L93 Difference]: Finished difference Result 318 states and 320 transitions. [2024-11-09 07:28:42,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2024-11-09 07:28:42,011 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 5.5) internal successors, (308), 55 states have internal predecessors, (308), 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 303 [2024-11-09 07:28:42,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:28:42,012 INFO L225 Difference]: With dead ends: 318 [2024-11-09 07:28:42,013 INFO L226 Difference]: Without dead ends: 316 [2024-11-09 07:28:42,014 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 1059 GetRequests, 847 SyntacticMatches, 100 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5916 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=4164, Invalid=8718, Unknown=0, NotChecked=0, Total=12882 [2024-11-09 07:28:42,015 INFO L432 NwaCegarLoop]: 57 mSDtfsCounter, 16 mSDsluCounter, 369 mSDsCounter, 0 mSdLazyCounter, 500 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 426 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 500 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:28:42,015 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 426 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 500 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:28:42,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 316 states. [2024-11-09 07:28:42,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 316 to 309. [2024-11-09 07:28:42,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 308 states have (on average 1.0097402597402598) internal successors, (311), 308 states have internal predecessors, (311), 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) [2024-11-09 07:28:42,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 311 transitions. [2024-11-09 07:28:42,039 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 311 transitions. Word has length 303 [2024-11-09 07:28:42,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:28:42,040 INFO L471 AbstractCegarLoop]: Abstraction has 309 states and 311 transitions. [2024-11-09 07:28:42,040 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 5.5) internal successors, (308), 55 states have internal predecessors, (308), 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) [2024-11-09 07:28:42,040 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 311 transitions. [2024-11-09 07:28:42,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 308 [2024-11-09 07:28:42,041 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:28:42,041 INFO L215 NwaCegarLoop]: trace histogram [51, 51, 50, 50, 50, 50, 1, 1, 1, 1, 1] [2024-11-09 07:28:42,063 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Ended with exit code 0 [2024-11-09 07:28:42,241 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable99,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:28:42,242 INFO L396 AbstractCegarLoop]: === Iteration 101 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:28:42,242 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:28:42,242 INFO L85 PathProgramCache]: Analyzing trace with hash 1202896123, now seen corresponding path program 99 times [2024-11-09 07:28:42,242 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:28:42,242 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1066051268] [2024-11-09 07:28:42,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:28:42,242 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:28:42,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:28:48,489 INFO L134 CoverageAnalysis]: Checked inductivity of 7550 backedges. 4853 proven. 2697 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:28:48,489 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:28:48,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1066051268] [2024-11-09 07:28:48,489 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1066051268] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:28:48,490 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087052567] [2024-11-09 07:28:48,490 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:28:48,490 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:28:48,490 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:28:48,491 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:28:48,492 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Waiting until timeout for monitored process [2024-11-09 07:28:49,039 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:28:49,039 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:28:49,046 INFO L255 TraceCheckSpWp]: Trace formula consists of 885 conjuncts, 104 conjuncts are in the unsatisfiable core [2024-11-09 07:28:49,050 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:28:55,587 INFO L134 CoverageAnalysis]: Checked inductivity of 7550 backedges. 5050 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:28:55,588 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:29:00,219 INFO L134 CoverageAnalysis]: Checked inductivity of 7550 backedges. 5050 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:29:00,220 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1087052567] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:29:00,220 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1304734250] [2024-11-09 07:29:00,220 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:29:00,221 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:29:00,221 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:29:00,221 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:29:00,221 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:29:00,364 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:29:01,665 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '152963#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:29:01,665 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:29:01,665 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:29:01,666 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [104, 104, 104] total 157 [2024-11-09 07:29:01,666 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597548527] [2024-11-09 07:29:01,666 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:29:01,666 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 158 states [2024-11-09 07:29:01,666 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:29:01,668 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2024-11-09 07:29:01,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5644, Invalid=21746, Unknown=0, NotChecked=0, Total=27390 [2024-11-09 07:29:01,669 INFO L87 Difference]: Start difference. First operand 309 states and 311 transitions. Second operand has 158 states, 158 states have (on average 3.2721518987341773) internal successors, (517), 157 states have internal predecessors, (517), 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) [2024-11-09 07:29:03,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:29:03,546 INFO L93 Difference]: Finished difference Result 519 states and 523 transitions. [2024-11-09 07:29:03,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2024-11-09 07:29:03,546 INFO L78 Accepts]: Start accepts. Automaton has has 158 states, 158 states have (on average 3.2721518987341773) internal successors, (517), 157 states have internal predecessors, (517), 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 307 [2024-11-09 07:29:03,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:29:03,548 INFO L225 Difference]: With dead ends: 519 [2024-11-09 07:29:03,548 INFO L226 Difference]: Without dead ends: 311 [2024-11-09 07:29:03,550 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 1023 GetRequests, 758 SyntacticMatches, 101 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17544 ImplicationChecksByTransitivity, 15.3s TimeCoverageRelationStatistics Valid=5644, Invalid=21746, Unknown=0, NotChecked=0, Total=27390 [2024-11-09 07:29:03,551 INFO L432 NwaCegarLoop]: 53 mSDtfsCounter, 1 mSDsluCounter, 638 mSDsCounter, 0 mSdLazyCounter, 2125 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 691 SdHoareTripleChecker+Invalid, 2126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:29:03,551 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 691 Invalid, 2126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2125 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2024-11-09 07:29:03,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 311 states. [2024-11-09 07:29:03,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 311 to 311. [2024-11-09 07:29:03,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 311 states, 310 states have (on average 1.0096774193548388) internal successors, (313), 310 states have internal predecessors, (313), 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) [2024-11-09 07:29:03,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 311 states to 311 states and 313 transitions. [2024-11-09 07:29:03,582 INFO L78 Accepts]: Start accepts. Automaton has 311 states and 313 transitions. Word has length 307 [2024-11-09 07:29:03,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:29:03,582 INFO L471 AbstractCegarLoop]: Abstraction has 311 states and 313 transitions. [2024-11-09 07:29:03,582 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 158 states, 158 states have (on average 3.2721518987341773) internal successors, (517), 157 states have internal predecessors, (517), 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) [2024-11-09 07:29:03,582 INFO L276 IsEmpty]: Start isEmpty. Operand 311 states and 313 transitions. [2024-11-09 07:29:03,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2024-11-09 07:29:03,584 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:29:03,584 INFO L215 NwaCegarLoop]: trace histogram [51, 51, 51, 51, 50, 50, 1, 1, 1, 1, 1] [2024-11-09 07:29:03,603 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Forceful destruction successful, exit code 0 [2024-11-09 07:29:03,785 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable100 [2024-11-09 07:29:03,785 INFO L396 AbstractCegarLoop]: === Iteration 102 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:29:03,785 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:29:03,785 INFO L85 PathProgramCache]: Analyzing trace with hash 1881641088, now seen corresponding path program 100 times [2024-11-09 07:29:03,785 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:29:03,785 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [40618639] [2024-11-09 07:29:03,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:29:03,786 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:29:03,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:29:07,636 INFO L134 CoverageAnalysis]: Checked inductivity of 7651 backedges. 2500 proven. 5151 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:29:07,636 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:29:07,636 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [40618639] [2024-11-09 07:29:07,637 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [40618639] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:29:07,637 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2013134607] [2024-11-09 07:29:07,637 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:29:07,637 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:29:07,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:29:07,639 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:29:07,642 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Waiting until timeout for monitored process [2024-11-09 07:29:08,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:29:08,218 INFO L255 TraceCheckSpWp]: Trace formula consists of 891 conjuncts, 105 conjuncts are in the unsatisfiable core [2024-11-09 07:29:08,222 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:29:08,703 INFO L134 CoverageAnalysis]: Checked inductivity of 7651 backedges. 2601 proven. 5050 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:29:08,703 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:29:11,824 INFO L134 CoverageAnalysis]: Checked inductivity of 7651 backedges. 2601 proven. 5050 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:29:11,825 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2013134607] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:29:11,825 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [430652665] [2024-11-09 07:29:11,825 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:29:11,825 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:29:11,826 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:29:11,826 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:29:11,826 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:29:11,985 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:29:12,736 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '155964#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:29:12,736 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:29:12,736 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:29:12,736 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 56 [2024-11-09 07:29:12,736 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386119659] [2024-11-09 07:29:12,736 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:29:12,737 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2024-11-09 07:29:12,737 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:29:12,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2024-11-09 07:29:12,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1467, Invalid=2693, Unknown=0, NotChecked=0, Total=4160 [2024-11-09 07:29:12,739 INFO L87 Difference]: Start difference. First operand 311 states and 313 transitions. Second operand has 57 states, 57 states have (on average 5.508771929824562) internal successors, (314), 56 states have internal predecessors, (314), 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) [2024-11-09 07:29:14,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:29:14,531 INFO L93 Difference]: Finished difference Result 324 states and 326 transitions. [2024-11-09 07:29:14,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2024-11-09 07:29:14,532 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 5.508771929824562) internal successors, (314), 56 states have internal predecessors, (314), 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 309 [2024-11-09 07:29:14,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:29:14,533 INFO L225 Difference]: With dead ends: 324 [2024-11-09 07:29:14,533 INFO L226 Difference]: Without dead ends: 322 [2024-11-09 07:29:14,534 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 1080 GetRequests, 863 SyntacticMatches, 103 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6187 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=4323, Invalid=9017, Unknown=0, NotChecked=0, Total=13340 [2024-11-09 07:29:14,534 INFO L432 NwaCegarLoop]: 58 mSDtfsCounter, 15 mSDsluCounter, 404 mSDsCounter, 0 mSdLazyCounter, 542 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 462 SdHoareTripleChecker+Invalid, 543 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 542 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-09 07:29:14,535 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 462 Invalid, 543 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 542 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-09 07:29:14,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2024-11-09 07:29:14,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 315. [2024-11-09 07:29:14,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 315 states, 314 states have (on average 1.0095541401273886) internal successors, (317), 314 states have internal predecessors, (317), 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) [2024-11-09 07:29:14,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 317 transitions. [2024-11-09 07:29:14,559 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 317 transitions. Word has length 309 [2024-11-09 07:29:14,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:29:14,559 INFO L471 AbstractCegarLoop]: Abstraction has 315 states and 317 transitions. [2024-11-09 07:29:14,560 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 5.508771929824562) internal successors, (314), 56 states have internal predecessors, (314), 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) [2024-11-09 07:29:14,560 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 317 transitions. [2024-11-09 07:29:14,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 314 [2024-11-09 07:29:14,561 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:29:14,561 INFO L215 NwaCegarLoop]: trace histogram [52, 52, 51, 51, 51, 51, 1, 1, 1, 1, 1] [2024-11-09 07:29:14,584 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Forceful destruction successful, exit code 0 [2024-11-09 07:29:14,761 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable101 [2024-11-09 07:29:14,761 INFO L396 AbstractCegarLoop]: === Iteration 103 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:29:14,762 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:29:14,762 INFO L85 PathProgramCache]: Analyzing trace with hash 30480680, now seen corresponding path program 101 times [2024-11-09 07:29:14,762 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:29:14,762 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [222874295] [2024-11-09 07:29:14,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:29:14,762 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:29:14,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:29:21,841 INFO L134 CoverageAnalysis]: Checked inductivity of 7854 backedges. 5052 proven. 2802 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:29:21,842 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:29:21,842 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [222874295] [2024-11-09 07:29:21,842 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [222874295] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:29:21,842 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [505059208] [2024-11-09 07:29:21,842 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:29:21,842 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:29:21,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:29:21,843 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:29:21,844 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Waiting until timeout for monitored process [2024-11-09 07:29:22,549 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2024-11-09 07:29:22,549 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:29:22,559 INFO L255 TraceCheckSpWp]: Trace formula consists of 902 conjuncts, 106 conjuncts are in the unsatisfiable core [2024-11-09 07:29:22,569 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:29:29,053 INFO L134 CoverageAnalysis]: Checked inductivity of 7854 backedges. 5253 proven. 2601 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:29:29,054 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:29:33,866 INFO L134 CoverageAnalysis]: Checked inductivity of 7854 backedges. 5253 proven. 2601 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:29:33,866 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [505059208] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:29:33,867 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1830173028] [2024-11-09 07:29:33,867 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:29:33,867 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:29:33,868 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:29:33,868 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:29:33,868 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:29:34,019 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:29:35,545 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '158955#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:29:35,545 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:29:35,545 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:29:35,546 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [106, 106, 106] total 160 [2024-11-09 07:29:35,546 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135881544] [2024-11-09 07:29:35,546 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:29:35,546 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 161 states [2024-11-09 07:29:35,546 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:29:35,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 161 interpolants. [2024-11-09 07:29:35,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5858, Invalid=22534, Unknown=0, NotChecked=0, Total=28392 [2024-11-09 07:29:35,550 INFO L87 Difference]: Start difference. First operand 315 states and 317 transitions. Second operand has 161 states, 161 states have (on average 3.2732919254658386) internal successors, (527), 160 states have internal predecessors, (527), 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) [2024-11-09 07:29:37,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:29:37,211 INFO L93 Difference]: Finished difference Result 529 states and 533 transitions. [2024-11-09 07:29:37,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2024-11-09 07:29:37,211 INFO L78 Accepts]: Start accepts. Automaton has has 161 states, 161 states have (on average 3.2732919254658386) internal successors, (527), 160 states have internal predecessors, (527), 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 313 [2024-11-09 07:29:37,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:29:37,213 INFO L225 Difference]: With dead ends: 529 [2024-11-09 07:29:37,213 INFO L226 Difference]: Without dead ends: 317 [2024-11-09 07:29:37,216 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 1043 GetRequests, 773 SyntacticMatches, 103 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18200 ImplicationChecksByTransitivity, 16.1s TimeCoverageRelationStatistics Valid=5858, Invalid=22534, Unknown=0, NotChecked=0, Total=28392 [2024-11-09 07:29:37,216 INFO L432 NwaCegarLoop]: 54 mSDtfsCounter, 1 mSDsluCounter, 568 mSDsCounter, 0 mSdLazyCounter, 1923 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 622 SdHoareTripleChecker+Invalid, 1924 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1923 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:29:37,216 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 622 Invalid, 1924 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1923 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2024-11-09 07:29:37,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2024-11-09 07:29:37,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 317. [2024-11-09 07:29:37,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 317 states, 316 states have (on average 1.009493670886076) internal successors, (319), 316 states have internal predecessors, (319), 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) [2024-11-09 07:29:37,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 319 transitions. [2024-11-09 07:29:37,245 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 319 transitions. Word has length 313 [2024-11-09 07:29:37,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:29:37,245 INFO L471 AbstractCegarLoop]: Abstraction has 317 states and 319 transitions. [2024-11-09 07:29:37,245 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 161 states, 161 states have (on average 3.2732919254658386) internal successors, (527), 160 states have internal predecessors, (527), 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) [2024-11-09 07:29:37,246 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 319 transitions. [2024-11-09 07:29:37,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 316 [2024-11-09 07:29:37,247 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:29:37,247 INFO L215 NwaCegarLoop]: trace histogram [52, 52, 52, 52, 51, 51, 1, 1, 1, 1, 1] [2024-11-09 07:29:37,271 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Forceful destruction successful, exit code 0 [2024-11-09 07:29:37,447 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable102,103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:29:37,447 INFO L396 AbstractCegarLoop]: === Iteration 104 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:29:37,448 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:29:37,448 INFO L85 PathProgramCache]: Analyzing trace with hash 1102607597, now seen corresponding path program 102 times [2024-11-09 07:29:37,448 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:29:37,448 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2142900932] [2024-11-09 07:29:37,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:29:37,448 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:29:37,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:29:41,264 INFO L134 CoverageAnalysis]: Checked inductivity of 7957 backedges. 2601 proven. 5356 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:29:41,264 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:29:41,264 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2142900932] [2024-11-09 07:29:41,265 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2142900932] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:29:41,265 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [772214577] [2024-11-09 07:29:41,265 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:29:41,265 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:29:41,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:29:41,266 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:29:41,268 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Waiting until timeout for monitored process [2024-11-09 07:29:41,856 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:29:41,856 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:29:41,864 INFO L255 TraceCheckSpWp]: Trace formula consists of 908 conjuncts, 110 conjuncts are in the unsatisfiable core [2024-11-09 07:29:41,868 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:29:42,315 INFO L134 CoverageAnalysis]: Checked inductivity of 7957 backedges. 2704 proven. 5253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:29:42,315 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:29:45,605 INFO L134 CoverageAnalysis]: Checked inductivity of 7957 backedges. 2704 proven. 5253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:29:45,605 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [772214577] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:29:45,605 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [973095197] [2024-11-09 07:29:45,606 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:29:45,606 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:29:45,606 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:29:45,606 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:29:45,606 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:29:45,741 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:29:46,449 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '162014#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:29:46,450 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:29:46,450 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:29:46,450 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 57 [2024-11-09 07:29:46,450 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846923686] [2024-11-09 07:29:46,450 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:29:46,451 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2024-11-09 07:29:46,451 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:29:46,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2024-11-09 07:29:46,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1521, Invalid=2769, Unknown=0, NotChecked=0, Total=4290 [2024-11-09 07:29:46,452 INFO L87 Difference]: Start difference. First operand 317 states and 319 transitions. Second operand has 58 states, 58 states have (on average 5.517241379310345) internal successors, (320), 57 states have internal predecessors, (320), 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) [2024-11-09 07:29:48,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:29:48,225 INFO L93 Difference]: Finished difference Result 330 states and 332 transitions. [2024-11-09 07:29:48,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2024-11-09 07:29:48,226 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 5.517241379310345) internal successors, (320), 57 states have internal predecessors, (320), 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 315 [2024-11-09 07:29:48,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:29:48,227 INFO L225 Difference]: With dead ends: 330 [2024-11-09 07:29:48,227 INFO L226 Difference]: Without dead ends: 328 [2024-11-09 07:29:48,228 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 1101 GetRequests, 881 SyntacticMatches, 104 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6360 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=4485, Invalid=9321, Unknown=0, NotChecked=0, Total=13806 [2024-11-09 07:29:48,228 INFO L432 NwaCegarLoop]: 59 mSDtfsCounter, 11 mSDsluCounter, 360 mSDsCounter, 0 mSdLazyCounter, 507 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 419 SdHoareTripleChecker+Invalid, 508 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 507 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-09 07:29:48,228 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 419 Invalid, 508 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 507 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-09 07:29:48,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2024-11-09 07:29:48,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 321. [2024-11-09 07:29:48,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 321 states, 320 states have (on average 1.009375) internal successors, (323), 320 states have internal predecessors, (323), 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) [2024-11-09 07:29:48,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 321 states to 321 states and 323 transitions. [2024-11-09 07:29:48,251 INFO L78 Accepts]: Start accepts. Automaton has 321 states and 323 transitions. Word has length 315 [2024-11-09 07:29:48,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:29:48,252 INFO L471 AbstractCegarLoop]: Abstraction has 321 states and 323 transitions. [2024-11-09 07:29:48,252 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 5.517241379310345) internal successors, (320), 57 states have internal predecessors, (320), 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) [2024-11-09 07:29:48,252 INFO L276 IsEmpty]: Start isEmpty. Operand 321 states and 323 transitions. [2024-11-09 07:29:48,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 320 [2024-11-09 07:29:48,254 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:29:48,254 INFO L215 NwaCegarLoop]: trace histogram [53, 53, 52, 52, 52, 52, 1, 1, 1, 1, 1] [2024-11-09 07:29:48,271 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Ended with exit code 0 [2024-11-09 07:29:48,454 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable103 [2024-11-09 07:29:48,455 INFO L396 AbstractCegarLoop]: === Iteration 105 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:29:48,455 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:29:48,455 INFO L85 PathProgramCache]: Analyzing trace with hash 508559125, now seen corresponding path program 103 times [2024-11-09 07:29:48,455 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:29:48,455 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [676235049] [2024-11-09 07:29:48,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:29:48,455 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:29:48,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:29:55,653 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 5255 proven. 2909 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:29:55,653 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:29:55,653 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [676235049] [2024-11-09 07:29:55,653 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [676235049] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:29:55,653 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1077667515] [2024-11-09 07:29:55,653 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:29:55,653 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:29:55,653 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:29:55,654 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:29:55,655 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Waiting until timeout for monitored process [2024-11-09 07:29:56,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:29:56,224 INFO L255 TraceCheckSpWp]: Trace formula consists of 919 conjuncts, 108 conjuncts are in the unsatisfiable core [2024-11-09 07:29:56,228 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:30:02,660 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 5460 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:30:02,661 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:30:07,620 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 5460 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:30:07,620 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1077667515] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:30:07,621 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [457435890] [2024-11-09 07:30:07,621 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:30:07,621 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:30:07,622 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:30:07,622 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:30:07,622 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:30:07,748 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:30:09,193 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '165062#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:30:09,193 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:30:09,193 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:30:09,194 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [108, 108, 108] total 163 [2024-11-09 07:30:09,194 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747080255] [2024-11-09 07:30:09,194 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:30:09,195 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 164 states [2024-11-09 07:30:09,195 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:30:09,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 164 interpolants. [2024-11-09 07:30:09,200 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6076, Invalid=23336, Unknown=0, NotChecked=0, Total=29412 [2024-11-09 07:30:09,200 INFO L87 Difference]: Start difference. First operand 321 states and 323 transitions. Second operand has 164 states, 164 states have (on average 3.274390243902439) internal successors, (537), 163 states have internal predecessors, (537), 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) [2024-11-09 07:30:11,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:30:11,044 INFO L93 Difference]: Finished difference Result 539 states and 543 transitions. [2024-11-09 07:30:11,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2024-11-09 07:30:11,045 INFO L78 Accepts]: Start accepts. Automaton has has 164 states, 164 states have (on average 3.274390243902439) internal successors, (537), 163 states have internal predecessors, (537), 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 319 [2024-11-09 07:30:11,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:30:11,046 INFO L225 Difference]: With dead ends: 539 [2024-11-09 07:30:11,046 INFO L226 Difference]: Without dead ends: 323 [2024-11-09 07:30:11,048 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 1063 GetRequests, 788 SyntacticMatches, 105 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18868 ImplicationChecksByTransitivity, 16.2s TimeCoverageRelationStatistics Valid=6076, Invalid=23336, Unknown=0, NotChecked=0, Total=29412 [2024-11-09 07:30:11,048 INFO L432 NwaCegarLoop]: 55 mSDtfsCounter, 1 mSDsluCounter, 640 mSDsCounter, 0 mSdLazyCounter, 2150 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 695 SdHoareTripleChecker+Invalid, 2151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:30:11,048 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 695 Invalid, 2151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2150 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2024-11-09 07:30:11,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2024-11-09 07:30:11,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 323. [2024-11-09 07:30:11,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 323 states, 322 states have (on average 1.0093167701863355) internal successors, (325), 322 states have internal predecessors, (325), 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) [2024-11-09 07:30:11,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 325 transitions. [2024-11-09 07:30:11,083 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 325 transitions. Word has length 319 [2024-11-09 07:30:11,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:30:11,084 INFO L471 AbstractCegarLoop]: Abstraction has 323 states and 325 transitions. [2024-11-09 07:30:11,084 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 164 states, 164 states have (on average 3.274390243902439) internal successors, (537), 163 states have internal predecessors, (537), 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) [2024-11-09 07:30:11,084 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 325 transitions. [2024-11-09 07:30:11,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 322 [2024-11-09 07:30:11,085 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:30:11,085 INFO L215 NwaCegarLoop]: trace histogram [53, 53, 53, 53, 52, 52, 1, 1, 1, 1, 1] [2024-11-09 07:30:11,106 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Forceful destruction successful, exit code 0 [2024-11-09 07:30:11,286 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable104,105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:30:11,286 INFO L396 AbstractCegarLoop]: === Iteration 106 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:30:11,286 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:30:11,286 INFO L85 PathProgramCache]: Analyzing trace with hash 556970778, now seen corresponding path program 104 times [2024-11-09 07:30:11,286 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:30:11,286 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [262512549] [2024-11-09 07:30:11,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:30:11,287 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:30:11,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:30:15,493 INFO L134 CoverageAnalysis]: Checked inductivity of 8269 backedges. 2704 proven. 5565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:30:15,493 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:30:15,493 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [262512549] [2024-11-09 07:30:15,494 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [262512549] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:30:15,494 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [371364981] [2024-11-09 07:30:15,494 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:30:15,494 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:30:15,494 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:30:15,495 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:30:15,496 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Waiting until timeout for monitored process [2024-11-09 07:30:16,269 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 54 check-sat command(s) [2024-11-09 07:30:16,269 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:30:16,277 INFO L255 TraceCheckSpWp]: Trace formula consists of 925 conjuncts, 112 conjuncts are in the unsatisfiable core [2024-11-09 07:30:16,281 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:30:16,755 INFO L134 CoverageAnalysis]: Checked inductivity of 8269 backedges. 2809 proven. 5460 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:30:16,755 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:30:20,195 INFO L134 CoverageAnalysis]: Checked inductivity of 8269 backedges. 2809 proven. 5460 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:30:20,195 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [371364981] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:30:20,195 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1891133540] [2024-11-09 07:30:20,196 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-09 07:30:20,196 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:30:20,196 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:30:20,197 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:30:20,197 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:30:20,337 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:30:21,123 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '168179#(and (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| 0) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|))' at error location [2024-11-09 07:30:21,123 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:30:21,123 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:30:21,123 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 58 [2024-11-09 07:30:21,123 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611064841] [2024-11-09 07:30:21,124 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:30:21,124 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2024-11-09 07:30:21,124 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:30:21,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2024-11-09 07:30:21,125 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1576, Invalid=2846, Unknown=0, NotChecked=0, Total=4422 [2024-11-09 07:30:21,125 INFO L87 Difference]: Start difference. First operand 323 states and 325 transitions. Second operand has 59 states, 59 states have (on average 5.52542372881356) internal successors, (326), 58 states have internal predecessors, (326), 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) [2024-11-09 07:30:23,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:30:23,082 INFO L93 Difference]: Finished difference Result 336 states and 338 transitions. [2024-11-09 07:30:23,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2024-11-09 07:30:23,082 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 5.52542372881356) internal successors, (326), 58 states have internal predecessors, (326), 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 321 [2024-11-09 07:30:23,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:30:23,084 INFO L225 Difference]: With dead ends: 336 [2024-11-09 07:30:23,084 INFO L226 Difference]: Without dead ends: 334 [2024-11-09 07:30:23,085 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 1122 GetRequests, 898 SyntacticMatches, 106 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6588 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=4650, Invalid=9630, Unknown=0, NotChecked=0, Total=14280 [2024-11-09 07:30:23,086 INFO L432 NwaCegarLoop]: 60 mSDtfsCounter, 15 mSDsluCounter, 436 mSDsCounter, 0 mSdLazyCounter, 588 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 496 SdHoareTripleChecker+Invalid, 589 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 588 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-09 07:30:23,086 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 496 Invalid, 589 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 588 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-09 07:30:23,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2024-11-09 07:30:23,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 327. [2024-11-09 07:30:23,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 327 states, 326 states have (on average 1.00920245398773) internal successors, (329), 326 states have internal predecessors, (329), 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) [2024-11-09 07:30:23,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 329 transitions. [2024-11-09 07:30:23,110 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 329 transitions. Word has length 321 [2024-11-09 07:30:23,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:30:23,111 INFO L471 AbstractCegarLoop]: Abstraction has 327 states and 329 transitions. [2024-11-09 07:30:23,111 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 5.52542372881356) internal successors, (326), 58 states have internal predecessors, (326), 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) [2024-11-09 07:30:23,111 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 329 transitions. [2024-11-09 07:30:23,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2024-11-09 07:30:23,112 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:30:23,112 INFO L215 NwaCegarLoop]: trace histogram [54, 54, 53, 53, 53, 53, 1, 1, 1, 1, 1] [2024-11-09 07:30:23,134 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Forceful destruction successful, exit code 0 [2024-11-09 07:30:23,313 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88dfb79d-fe81-4b38-9009-83c29f1ef752/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable105 [2024-11-09 07:30:23,313 INFO L396 AbstractCegarLoop]: === Iteration 107 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:30:23,313 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:30:23,313 INFO L85 PathProgramCache]: Analyzing trace with hash 485842626, now seen corresponding path program 105 times [2024-11-09 07:30:23,313 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:30:23,314 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1124297906] [2024-11-09 07:30:23,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:30:23,314 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:30:23,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat