./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/watermelon.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 826ab2ba Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/plugins/org.eclipse.equinox.launcher_1.6.800.v20240513-1750.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/watermelon.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E --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 dda0b992ac1600896503297d86377b482d0a82ded923ea00c7e9ff3fed4db7e7 --- Real Ultimate output --- This is Ultimate 0.3.0-dev-826ab2b [2024-11-14 04:06:46,872 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-14 04:06:46,978 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/config/svcomp-Reach-32bit-Taipan_Default.epf [2024-11-14 04:06:46,987 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-14 04:06:46,987 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-14 04:06:47,028 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-14 04:06:47,030 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-14 04:06:47,030 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-14 04:06:47,031 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-14 04:06:47,031 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-14 04:06:47,033 INFO L153 SettingsManager]: * User list type=DISABLED [2024-11-14 04:06:47,033 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2024-11-14 04:06:47,033 INFO L153 SettingsManager]: * Explicit value domain=true [2024-11-14 04:06:47,033 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2024-11-14 04:06:47,033 INFO L153 SettingsManager]: * Octagon Domain=false [2024-11-14 04:06:47,033 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2024-11-14 04:06:47,034 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2024-11-14 04:06:47,034 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2024-11-14 04:06:47,034 INFO L153 SettingsManager]: * Interval Domain=false [2024-11-14 04:06:47,034 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2024-11-14 04:06:47,034 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2024-11-14 04:06:47,034 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2024-11-14 04:06:47,035 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-14 04:06:47,035 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-14 04:06:47,035 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-14 04:06:47,035 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-14 04:06:47,035 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-14 04:06:47,035 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-14 04:06:47,035 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-14 04:06:47,035 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-14 04:06:47,035 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-14 04:06:47,035 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-14 04:06:47,035 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-14 04:06:47,035 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-14 04:06:47,036 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-14 04:06:47,036 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-14 04:06:47,036 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-14 04:06:47,036 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-14 04:06:47,036 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-14 04:06:47,036 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-14 04:06:47,036 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-14 04:06:47,036 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-14 04:06:47,036 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2024-11-14 04:06:47,037 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-14 04:06:47,038 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-14 04:06:47,038 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2024-11-14 04:06:47,038 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-14 04:06:47,038 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E 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 -> dda0b992ac1600896503297d86377b482d0a82ded923ea00c7e9ff3fed4db7e7 [2024-11-14 04:06:47,388 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-14 04:06:47,400 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-14 04:06:47,405 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-14 04:06:47,406 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-14 04:06:47,407 INFO L274 PluginConnector]: CDTParser initialized [2024-11-14 04:06:47,409 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/../../sv-benchmarks/c/loops-crafted-1/watermelon.c Unable to find full path for "g++" [2024-11-14 04:06:49,355 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-14 04:06:49,755 INFO L384 CDTParser]: Found 1 translation units. [2024-11-14 04:06:49,756 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/sv-benchmarks/c/loops-crafted-1/watermelon.c [2024-11-14 04:06:49,778 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/data/1f358afdf/68c49b713ac64d69aa7f600a5860c172/FLAG7d1bf49e0 [2024-11-14 04:06:49,819 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/data/1f358afdf/68c49b713ac64d69aa7f600a5860c172 [2024-11-14 04:06:49,823 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-14 04:06:49,826 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-14 04:06:49,828 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-14 04:06:49,829 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-14 04:06:49,834 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-14 04:06:49,836 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.11 04:06:49" (1/1) ... [2024-11-14 04:06:49,840 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6ef63f67 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 04:06:49, skipping insertion in model container [2024-11-14 04:06:49,840 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.11 04:06:49" (1/1) ... [2024-11-14 04:06:49,859 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-14 04:06:50,055 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_32b41d31-0823-4905-baa8-60a873104183/sv-benchmarks/c/loops-crafted-1/watermelon.c[373,386] [2024-11-14 04:06:50,085 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-14 04:06:50,097 INFO L200 MainTranslator]: Completed pre-run [2024-11-14 04:06:50,110 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_32b41d31-0823-4905-baa8-60a873104183/sv-benchmarks/c/loops-crafted-1/watermelon.c[373,386] [2024-11-14 04:06:50,122 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-14 04:06:50,142 INFO L204 MainTranslator]: Completed translation [2024-11-14 04:06:50,146 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 04:06:50 WrapperNode [2024-11-14 04:06:50,146 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-14 04:06:50,147 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-14 04:06:50,147 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-14 04:06:50,147 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-14 04:06:50,159 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 04:06:50" (1/1) ... [2024-11-14 04:06:50,167 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 04:06:50" (1/1) ... [2024-11-14 04:06:50,187 INFO L138 Inliner]: procedures = 15, calls = 10, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 64 [2024-11-14 04:06:50,187 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-14 04:06:50,188 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-14 04:06:50,188 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-14 04:06:50,188 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-14 04:06:50,196 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 04:06:50" (1/1) ... [2024-11-14 04:06:50,196 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 04:06:50" (1/1) ... [2024-11-14 04:06:50,197 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 04:06:50" (1/1) ... [2024-11-14 04:06:50,198 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 04:06:50" (1/1) ... [2024-11-14 04:06:50,202 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 04:06:50" (1/1) ... [2024-11-14 04:06:50,206 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 04:06:50" (1/1) ... [2024-11-14 04:06:50,207 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 04:06:50" (1/1) ... [2024-11-14 04:06:50,207 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 04:06:50" (1/1) ... [2024-11-14 04:06:50,209 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-14 04:06:50,211 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-14 04:06:50,211 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-14 04:06:50,211 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-14 04:06:50,212 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 04:06:50" (1/1) ... [2024-11-14 04:06:50,218 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-14 04:06:50,231 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:06:50,243 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2024-11-14 04:06:50,247 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2024-11-14 04:06:50,269 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-14 04:06:50,269 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-11-14 04:06:50,269 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-14 04:06:50,269 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-14 04:06:50,328 INFO L238 CfgBuilder]: Building ICFG [2024-11-14 04:06:50,331 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-14 04:06:50,495 INFO L? ?]: Removed 27 outVars from TransFormulas that were not future-live. [2024-11-14 04:06:50,495 INFO L287 CfgBuilder]: Performing block encoding [2024-11-14 04:06:50,552 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-14 04:06:50,552 INFO L316 CfgBuilder]: Removed 2 assume(true) statements. [2024-11-14 04:06:50,553 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.11 04:06:50 BoogieIcfgContainer [2024-11-14 04:06:50,553 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-14 04:06:50,555 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-14 04:06:50,555 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-14 04:06:50,560 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-14 04:06:50,561 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.11 04:06:49" (1/3) ... [2024-11-14 04:06:50,561 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15877d9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.11 04:06:50, skipping insertion in model container [2024-11-14 04:06:50,562 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 04:06:50" (2/3) ... [2024-11-14 04:06:50,562 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15877d9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.11 04:06:50, skipping insertion in model container [2024-11-14 04:06:50,562 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.11 04:06:50" (3/3) ... [2024-11-14 04:06:50,564 INFO L112 eAbstractionObserver]: Analyzing ICFG watermelon.c [2024-11-14 04:06:50,580 INFO L217 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-14 04:06:50,582 INFO L154 ceAbstractionStarter]: Applying trace abstraction to ICFG watermelon.c that has 1 procedures, 14 locations, 1 initial locations, 2 loop locations, and 1 error locations. [2024-11-14 04:06:50,649 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-14 04:06:50,663 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;@68079d30, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-14 04:06:50,664 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-11-14 04:06:50,668 INFO L276 IsEmpty]: Start isEmpty. Operand has 14 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 13 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) [2024-11-14 04:06:50,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2024-11-14 04:06:50,675 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:06:50,675 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:06:50,676 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:06:50,681 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:06:50,681 INFO L85 PathProgramCache]: Analyzing trace with hash -1116878479, now seen corresponding path program 1 times [2024-11-14 04:06:50,691 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:06:50,691 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1125366756] [2024-11-14 04:06:50,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:06:50,695 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:06:50,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:06:51,152 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:06:51,153 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:06:51,153 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1125366756] [2024-11-14 04:06:51,157 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1125366756] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 04:06:51,157 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 04:06:51,157 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2024-11-14 04:06:51,160 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252445845] [2024-11-14 04:06:51,161 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 04:06:51,166 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2024-11-14 04:06:51,166 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:06:51,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2024-11-14 04:06:51,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2024-11-14 04:06:51,193 INFO L87 Difference]: Start difference. First operand has 14 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 13 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) Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:06:51,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:06:51,312 INFO L93 Difference]: Finished difference Result 25 states and 32 transitions. [2024-11-14 04:06:51,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2024-11-14 04:06:51,314 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2024-11-14 04:06:51,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:06:51,322 INFO L225 Difference]: With dead ends: 25 [2024-11-14 04:06:51,322 INFO L226 Difference]: Without dead ends: 15 [2024-11-14 04:06:51,325 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2024-11-14 04:06:51,336 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 4 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 04:06:51,337 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 45 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 04:06:51,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2024-11-14 04:06:51,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 13. [2024-11-14 04:06:51,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 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) [2024-11-14 04:06:51,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2024-11-14 04:06:51,368 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 8 [2024-11-14 04:06:51,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:06:51,368 INFO L471 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2024-11-14 04:06:51,369 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:06:51,369 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2024-11-14 04:06:51,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2024-11-14 04:06:51,369 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:06:51,369 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:06:51,370 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-14 04:06:51,370 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:06:51,370 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:06:51,371 INFO L85 PathProgramCache]: Analyzing trace with hash -261389889, now seen corresponding path program 1 times [2024-11-14 04:06:51,371 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:06:51,371 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1843102641] [2024-11-14 04:06:51,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:06:51,371 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:06:51,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:06:51,660 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:06:51,661 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:06:51,661 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1843102641] [2024-11-14 04:06:51,661 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1843102641] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 04:06:51,661 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 04:06:51,661 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-11-14 04:06:51,662 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517944252] [2024-11-14 04:06:51,662 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 04:06:51,663 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-14 04:06:51,663 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:06:51,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-14 04:06:51,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-14 04:06:51,664 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 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) [2024-11-14 04:06:51,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:06:51,721 INFO L93 Difference]: Finished difference Result 18 states and 21 transitions. [2024-11-14 04:06:51,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-14 04:06:51,722 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 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 [2024-11-14 04:06:51,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:06:51,722 INFO L225 Difference]: With dead ends: 18 [2024-11-14 04:06:51,722 INFO L226 Difference]: Without dead ends: 11 [2024-11-14 04:06:51,723 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-14 04:06:51,723 INFO L432 NwaCegarLoop]: 6 mSDtfsCounter, 2 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 04:06:51,724 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 19 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 04:06:51,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2024-11-14 04:06:51,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2024-11-14 04:06:51,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:06:51,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 13 transitions. [2024-11-14 04:06:51,728 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 13 transitions. Word has length 9 [2024-11-14 04:06:51,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:06:51,728 INFO L471 AbstractCegarLoop]: Abstraction has 11 states and 13 transitions. [2024-11-14 04:06:51,728 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 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) [2024-11-14 04:06:51,728 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 13 transitions. [2024-11-14 04:06:51,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2024-11-14 04:06:51,728 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:06:51,729 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:06:51,729 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2024-11-14 04:06:51,729 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:06:51,730 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:06:51,730 INFO L85 PathProgramCache]: Analyzing trace with hash 1724388798, now seen corresponding path program 1 times [2024-11-14 04:06:51,730 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:06:51,730 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [144141622] [2024-11-14 04:06:51,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:06:51,730 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:06:51,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:06:51,829 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:06:51,829 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:06:51,829 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [144141622] [2024-11-14 04:06:51,829 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [144141622] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 04:06:51,829 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 04:06:51,830 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2024-11-14 04:06:51,830 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [658295698] [2024-11-14 04:06:51,830 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 04:06:51,830 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-14 04:06:51,830 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:06:51,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-14 04:06:51,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-11-14 04:06:51,831 INFO L87 Difference]: Start difference. First operand 11 states and 13 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:06:51,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:06:51,855 INFO L93 Difference]: Finished difference Result 19 states and 23 transitions. [2024-11-14 04:06:51,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-14 04:06:51,856 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2024-11-14 04:06:51,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:06:51,857 INFO L225 Difference]: With dead ends: 19 [2024-11-14 04:06:51,857 INFO L226 Difference]: Without dead ends: 12 [2024-11-14 04:06:51,857 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-11-14 04:06:51,858 INFO L432 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-14 04:06:51,859 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 12 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-14 04:06:51,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2024-11-14 04:06:51,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2024-11-14 04:06:51,863 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) [2024-11-14 04:06:51,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2024-11-14 04:06:51,864 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 9 [2024-11-14 04:06:51,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:06:51,864 INFO L471 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2024-11-14 04:06:51,864 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:06:51,864 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2024-11-14 04:06:51,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2024-11-14 04:06:51,865 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:06:51,865 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:06:51,865 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2024-11-14 04:06:51,865 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:06:51,866 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:06:51,866 INFO L85 PathProgramCache]: Analyzing trace with hash 1021109258, now seen corresponding path program 1 times [2024-11-14 04:06:51,866 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:06:51,866 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [843362385] [2024-11-14 04:06:51,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:06:51,867 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:06:51,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:06:51,944 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:06:51,945 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:06:51,945 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [843362385] [2024-11-14 04:06:51,945 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [843362385] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:06:51,945 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [327514001] [2024-11-14 04:06:51,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:06:51,945 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:06:51,946 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:06:51,949 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:06:51,950 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-11-14 04:06:52,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:06:52,022 INFO L255 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 4 conjuncts are in the unsatisfiable core [2024-11-14 04:06:52,026 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:06:52,085 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:06:52,085 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:06:52,126 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:06:52,128 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [327514001] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:06:52,128 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [167036924] [2024-11-14 04:06:52,152 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-14 04:06:52,153 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:06:52,156 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:06:52,161 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:06:52,162 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:06:52,708 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:06:53,547 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '212#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0) (exists ((|v_ULTIMATE.start_student_version_~w#1_24| Int)) (and (<= |v_ULTIMATE.start_student_version_~w#1_24| 3) (or (exists ((|v_ULTIMATE.start_main_~w~0#1_17| Int)) (and (<= 2147483648 (mod |v_ULTIMATE.start_main_~w~0#1_17| 4294967296)) (= (+ 4294967296 |v_ULTIMATE.start_student_version_~w#1_24|) (mod |v_ULTIMATE.start_main_~w~0#1_17| 4294967296)))) (exists ((|v_ULTIMATE.start_main_~w~0#1_17| Int)) (= (mod |v_ULTIMATE.start_main_~w~0#1_17| 4294967296) |v_ULTIMATE.start_student_version_~w#1_24|))))))' at error location [2024-11-14 04:06:53,548 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:06:53,548 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:06:53,548 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2024-11-14 04:06:53,548 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561314452] [2024-11-14 04:06:53,548 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:06:53,548 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2024-11-14 04:06:53,549 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:06:53,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2024-11-14 04:06:53,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2024-11-14 04:06:53,553 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 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) [2024-11-14 04:06:53,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:06:53,586 INFO L93 Difference]: Finished difference Result 20 states and 24 transitions. [2024-11-14 04:06:53,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-11-14 04:06:53,587 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 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) Word has length 10 [2024-11-14 04:06:53,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:06:53,588 INFO L225 Difference]: With dead ends: 20 [2024-11-14 04:06:53,588 INFO L226 Difference]: Without dead ends: 13 [2024-11-14 04:06:53,588 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2024-11-14 04:06:53,589 INFO L432 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-14 04:06:53,589 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 12 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-14 04:06:53,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2024-11-14 04:06:53,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2024-11-14 04:06:53,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:06:53,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2024-11-14 04:06:53,597 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 10 [2024-11-14 04:06:53,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:06:53,597 INFO L471 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2024-11-14 04:06:53,597 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 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) [2024-11-14 04:06:53,597 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2024-11-14 04:06:53,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2024-11-14 04:06:53,600 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:06:53,600 INFO L215 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:06:53,621 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2024-11-14 04:06:53,804 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:06:53,804 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:06:53,804 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:06:53,805 INFO L85 PathProgramCache]: Analyzing trace with hash 694279998, now seen corresponding path program 2 times [2024-11-14 04:06:53,805 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:06:53,805 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [978905899] [2024-11-14 04:06:53,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:06:53,805 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:06:53,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:06:54,049 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-11-14 04:06:54,051 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:06:54,051 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [978905899] [2024-11-14 04:06:54,051 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [978905899] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 04:06:54,051 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 04:06:54,051 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2024-11-14 04:06:54,051 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291962200] [2024-11-14 04:06:54,051 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 04:06:54,051 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2024-11-14 04:06:54,052 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:06:54,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2024-11-14 04:06:54,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-11-14 04:06:54,052 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:06:54,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:06:54,108 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2024-11-14 04:06:54,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2024-11-14 04:06:54,111 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2024-11-14 04:06:54,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:06:54,111 INFO L225 Difference]: With dead ends: 17 [2024-11-14 04:06:54,111 INFO L226 Difference]: Without dead ends: 13 [2024-11-14 04:06:54,112 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-11-14 04:06:54,112 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-14 04:06:54,113 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 12 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-14 04:06:54,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2024-11-14 04:06:54,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2024-11-14 04:06:54,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 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) [2024-11-14 04:06:54,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2024-11-14 04:06:54,119 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2024-11-14 04:06:54,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:06:54,120 INFO L471 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2024-11-14 04:06:54,120 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:06:54,120 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2024-11-14 04:06:54,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2024-11-14 04:06:54,120 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:06:54,120 INFO L215 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:06:54,120 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2024-11-14 04:06:54,120 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:06:54,123 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:06:54,123 INFO L85 PathProgramCache]: Analyzing trace with hash 49948050, now seen corresponding path program 1 times [2024-11-14 04:06:54,123 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:06:54,123 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1246495657] [2024-11-14 04:06:54,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:06:54,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:06:54,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:06:54,189 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-11-14 04:06:54,189 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:06:54,190 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1246495657] [2024-11-14 04:06:54,190 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1246495657] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 04:06:54,190 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 04:06:54,190 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2024-11-14 04:06:54,190 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1783302425] [2024-11-14 04:06:54,190 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 04:06:54,190 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-14 04:06:54,190 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:06:54,191 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-14 04:06:54,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-11-14 04:06:54,191 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:06:54,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:06:54,215 INFO L93 Difference]: Finished difference Result 18 states and 19 transitions. [2024-11-14 04:06:54,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-14 04:06:54,216 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2024-11-14 04:06:54,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:06:54,216 INFO L225 Difference]: With dead ends: 18 [2024-11-14 04:06:54,216 INFO L226 Difference]: Without dead ends: 14 [2024-11-14 04:06:54,217 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-11-14 04:06:54,217 INFO L432 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-14 04:06:54,218 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 11 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-14 04:06:54,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2024-11-14 04:06:54,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2024-11-14 04:06:54,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:06:54,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2024-11-14 04:06:54,224 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 12 [2024-11-14 04:06:54,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:06:54,224 INFO L471 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2024-11-14 04:06:54,227 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:06:54,227 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2024-11-14 04:06:54,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2024-11-14 04:06:54,227 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:06:54,227 INFO L215 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:06:54,228 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2024-11-14 04:06:54,228 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:06:54,228 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:06:54,228 INFO L85 PathProgramCache]: Analyzing trace with hash 1507088655, now seen corresponding path program 1 times [2024-11-14 04:06:54,228 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:06:54,228 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [747742507] [2024-11-14 04:06:54,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:06:54,229 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:06:54,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:06:54,321 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-11-14 04:06:54,321 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:06:54,321 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [747742507] [2024-11-14 04:06:54,321 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [747742507] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:06:54,321 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1880499290] [2024-11-14 04:06:54,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:06:54,321 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:06:54,321 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:06:54,323 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:06:54,326 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-11-14 04:06:54,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:06:54,380 INFO L255 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 4 conjuncts are in the unsatisfiable core [2024-11-14 04:06:54,380 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:06:54,415 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-11-14 04:06:54,415 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:06:54,451 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-11-14 04:06:54,454 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1880499290] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:06:54,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [706649305] [2024-11-14 04:06:54,456 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:06:54,457 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:06:54,458 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:06:54,458 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:06:54,458 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:06:54,770 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:06:55,383 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '431#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_student_version_~i~1#1_33| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_21| Int) (|v_ULTIMATE.start_student_version_~w#1_27| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_27| Int)) (and (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_21| 2147483648)) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_21| 2147483647) (<= 4 |v_ULTIMATE.start_student_version_~w#1_27|) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_27| |v_ULTIMATE.start_main_~is_divisible1~0#1_21|)) (or (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_27| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_33| |v_ULTIMATE.start_student_version_~w#1_27|)) (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_33| |v_ULTIMATE.start_student_version_~w#1_27|)) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_27| 0))) (<= |v_ULTIMATE.start_student_version_~w#1_27| |v_ULTIMATE.start_student_version_~i~1#1_33|))) (= ~true~0 1) (= ~false~0 0))' at error location [2024-11-14 04:06:55,384 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:06:55,384 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:06:55,384 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2024-11-14 04:06:55,384 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974157562] [2024-11-14 04:06:55,384 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:06:55,385 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2024-11-14 04:06:55,385 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:06:55,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2024-11-14 04:06:55,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2024-11-14 04:06:55,386 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:06:55,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:06:55,417 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2024-11-14 04:06:55,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-11-14 04:06:55,417 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2024-11-14 04:06:55,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:06:55,418 INFO L225 Difference]: With dead ends: 19 [2024-11-14 04:06:55,418 INFO L226 Difference]: Without dead ends: 15 [2024-11-14 04:06:55,418 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2024-11-14 04:06:55,419 INFO L432 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-14 04:06:55,419 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-14 04:06:55,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2024-11-14 04:06:55,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2024-11-14 04:06:55,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 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) [2024-11-14 04:06:55,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2024-11-14 04:06:55,426 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2024-11-14 04:06:55,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:06:55,426 INFO L471 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2024-11-14 04:06:55,426 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:06:55,427 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2024-11-14 04:06:55,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2024-11-14 04:06:55,427 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:06:55,428 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:06:55,448 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2024-11-14 04:06:55,628 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:06:55,628 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:06:55,629 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:06:55,629 INFO L85 PathProgramCache]: Analyzing trace with hash -566192846, now seen corresponding path program 2 times [2024-11-14 04:06:55,629 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:06:55,629 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [810122647] [2024-11-14 04:06:55,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:06:55,630 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:06:55,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:06:55,931 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:06:55,931 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:06:55,932 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [810122647] [2024-11-14 04:06:55,932 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [810122647] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:06:55,932 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1567008550] [2024-11-14 04:06:55,932 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 04:06:55,932 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:06:55,932 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:06:55,934 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:06:55,938 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-11-14 04:06:55,993 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2024-11-14 04:06:55,993 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:06:55,994 INFO L255 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 32 conjuncts are in the unsatisfiable core [2024-11-14 04:06:55,996 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:06:56,688 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:06:56,688 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:06:57,569 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:06:57,569 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1567008550] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:06:57,569 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1698290631] [2024-11-14 04:06:57,571 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:06:57,571 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:06:57,572 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:06:57,572 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:06:57,572 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:06:57,809 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:06:58,717 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '596#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0) (exists ((|v_ULTIMATE.start_student_version_~w#1_31| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_33| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_24| Int) (|v_ULTIMATE.start_student_version_~i~1#1_45| Int)) (and (<= 4 |v_ULTIMATE.start_student_version_~w#1_31|) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_33| |v_ULTIMATE.start_main_~is_divisible1~0#1_24|)) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_24| 2147483647) (<= |v_ULTIMATE.start_student_version_~w#1_31| |v_ULTIMATE.start_student_version_~i~1#1_45|) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_24| 2147483648)) (or (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_45| |v_ULTIMATE.start_student_version_~w#1_31|)) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_33| 0)) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_33| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_45| |v_ULTIMATE.start_student_version_~w#1_31|))))))' at error location [2024-11-14 04:06:58,717 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:06:58,717 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:06:58,717 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 13, 13] total 32 [2024-11-14 04:06:58,717 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839461827] [2024-11-14 04:06:58,717 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:06:58,718 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2024-11-14 04:06:58,718 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:06:58,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2024-11-14 04:06:58,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=1472, Unknown=0, NotChecked=0, Total=1640 [2024-11-14 04:06:58,720 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 32 states, 32 states have (on average 1.1875) internal successors, (38), 32 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) [2024-11-14 04:07:00,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:07:00,441 INFO L93 Difference]: Finished difference Result 40 states and 51 transitions. [2024-11-14 04:07:00,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2024-11-14 04:07:00,442 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.1875) internal successors, (38), 32 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 14 [2024-11-14 04:07:00,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:07:00,444 INFO L225 Difference]: With dead ends: 40 [2024-11-14 04:07:00,444 INFO L226 Difference]: Without dead ends: 34 [2024-11-14 04:07:00,446 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1369 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=436, Invalid=3596, Unknown=0, NotChecked=0, Total=4032 [2024-11-14 04:07:00,447 INFO L432 NwaCegarLoop]: 2 mSDtfsCounter, 73 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-14 04:07:00,448 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 27 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 245 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-14 04:07:00,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2024-11-14 04:07:00,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 27. [2024-11-14 04:07:00,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 26 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) [2024-11-14 04:07:00,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 32 transitions. [2024-11-14 04:07:00,462 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 32 transitions. Word has length 14 [2024-11-14 04:07:00,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:07:00,462 INFO L471 AbstractCegarLoop]: Abstraction has 27 states and 32 transitions. [2024-11-14 04:07:00,462 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.1875) internal successors, (38), 32 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) [2024-11-14 04:07:00,462 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 32 transitions. [2024-11-14 04:07:00,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2024-11-14 04:07:00,463 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:07:00,463 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:07:00,484 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2024-11-14 04:07:00,664 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:07:00,664 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:07:00,665 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:07:00,665 INFO L85 PathProgramCache]: Analyzing trace with hash -696794437, now seen corresponding path program 3 times [2024-11-14 04:07:00,665 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:07:00,665 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1192788565] [2024-11-14 04:07:00,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:07:00,666 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:07:00,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:07:01,447 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:01,447 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:07:01,447 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1192788565] [2024-11-14 04:07:01,447 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1192788565] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:07:01,447 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [524750861] [2024-11-14 04:07:01,447 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 04:07:01,447 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:07:01,448 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:07:01,451 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:07:01,453 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-11-14 04:07:01,509 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 04:07:01,510 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:07:01,511 INFO L255 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 36 conjuncts are in the unsatisfiable core [2024-11-14 04:07:01,513 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:07:02,685 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:02,686 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:07:03,553 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:03,553 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [524750861] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:07:03,554 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [129382802] [2024-11-14 04:07:03,555 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:07:03,556 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:07:03,556 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:07:03,556 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:07:03,556 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:07:03,724 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:07:04,691 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '882#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0) (exists ((|v_ULTIMATE.start_main_~is_divisible1~0#1_27| Int) (|v_ULTIMATE.start_student_version_~w#1_35| Int) (|v_ULTIMATE.start_student_version_~i~1#1_58| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_39| Int)) (and (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_27| 2147483647) (<= 4 |v_ULTIMATE.start_student_version_~w#1_35|) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_39| |v_ULTIMATE.start_main_~is_divisible1~0#1_27|)) (<= |v_ULTIMATE.start_student_version_~w#1_35| |v_ULTIMATE.start_student_version_~i~1#1_58|) (or (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_39| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_58| |v_ULTIMATE.start_student_version_~w#1_35|)) (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_58| |v_ULTIMATE.start_student_version_~w#1_35|)) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_39| 0))) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_27| 2147483648)))))' at error location [2024-11-14 04:07:04,691 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:07:04,691 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:07:04,691 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 39 [2024-11-14 04:07:04,692 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [921516607] [2024-11-14 04:07:04,692 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:07:04,692 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2024-11-14 04:07:04,692 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:07:04,693 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2024-11-14 04:07:04,694 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=2077, Unknown=0, NotChecked=0, Total=2256 [2024-11-14 04:07:04,695 INFO L87 Difference]: Start difference. First operand 27 states and 32 transitions. Second operand has 39 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 39 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) [2024-11-14 04:07:05,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:07:05,679 INFO L93 Difference]: Finished difference Result 39 states and 45 transitions. [2024-11-14 04:07:05,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2024-11-14 04:07:05,679 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 39 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) Word has length 16 [2024-11-14 04:07:05,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:07:05,680 INFO L225 Difference]: With dead ends: 39 [2024-11-14 04:07:05,680 INFO L226 Difference]: Without dead ends: 27 [2024-11-14 04:07:05,682 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 894 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=278, Invalid=3144, Unknown=0, NotChecked=0, Total=3422 [2024-11-14 04:07:05,683 INFO L432 NwaCegarLoop]: 5 mSDtfsCounter, 28 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 495 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 513 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 495 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 04:07:05,683 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 82 Invalid, 513 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 495 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 04:07:05,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2024-11-14 04:07:05,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2024-11-14 04:07:05,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 26 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) [2024-11-14 04:07:05,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2024-11-14 04:07:05,690 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 16 [2024-11-14 04:07:05,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:07:05,691 INFO L471 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2024-11-14 04:07:05,691 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 39 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) [2024-11-14 04:07:05,691 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2024-11-14 04:07:05,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2024-11-14 04:07:05,691 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:07:05,691 INFO L215 NwaCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:07:05,714 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2024-11-14 04:07:05,894 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:07:05,895 INFO L396 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:07:05,895 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:07:05,895 INFO L85 PathProgramCache]: Analyzing trace with hash -891779345, now seen corresponding path program 4 times [2024-11-14 04:07:05,895 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:07:05,895 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [749014136] [2024-11-14 04:07:05,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:07:05,895 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:07:05,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:07:06,298 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:06,298 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:07:06,298 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [749014136] [2024-11-14 04:07:06,298 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [749014136] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:07:06,298 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1026470474] [2024-11-14 04:07:06,298 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 04:07:06,298 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:07:06,298 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:07:06,303 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:07:06,305 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-11-14 04:07:06,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:07:06,352 INFO L255 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 13 conjuncts are in the unsatisfiable core [2024-11-14 04:07:06,353 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:07:06,678 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:06,679 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:07:06,921 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:06,921 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1026470474] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:07:06,921 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1694473470] [2024-11-14 04:07:06,923 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:07:06,923 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:07:06,923 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:07:06,923 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:07:06,924 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:07:07,068 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:07:07,659 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1137#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_student_version_~i~1#1_71| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_29| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_43| Int) (|v_ULTIMATE.start_student_version_~w#1_39| Int)) (and (<= 4 |v_ULTIMATE.start_student_version_~w#1_39|) (or (and (= |v_ULTIMATE.start_student_version_~i~1#1_71| |v_ULTIMATE.start_student_version_~w#1_39|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_43| 1)) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_43| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_71| |v_ULTIMATE.start_student_version_~w#1_39|)))) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_29| 2147483647) (<= |v_ULTIMATE.start_student_version_~w#1_39| |v_ULTIMATE.start_student_version_~i~1#1_71|) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_29| 2147483648)) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_43| |v_ULTIMATE.start_main_~is_divisible1~0#1_29|)))) (= ~true~0 1) (= ~false~0 0))' at error location [2024-11-14 04:07:07,659 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:07:07,659 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:07:07,660 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 29 [2024-11-14 04:07:07,660 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232135217] [2024-11-14 04:07:07,660 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:07:07,660 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2024-11-14 04:07:07,660 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:07:07,661 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2024-11-14 04:07:07,661 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=1201, Unknown=0, NotChecked=0, Total=1406 [2024-11-14 04:07:07,661 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 29 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) [2024-11-14 04:07:07,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:07:07,816 INFO L93 Difference]: Finished difference Result 39 states and 45 transitions. [2024-11-14 04:07:07,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2024-11-14 04:07:07,819 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 29 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 17 [2024-11-14 04:07:07,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:07:07,820 INFO L225 Difference]: With dead ends: 39 [2024-11-14 04:07:07,820 INFO L226 Difference]: Without dead ends: 35 [2024-11-14 04:07:07,820 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 23 SyntacticMatches, 4 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 766 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=223, Invalid=1259, Unknown=0, NotChecked=0, Total=1482 [2024-11-14 04:07:07,821 INFO L432 NwaCegarLoop]: 4 mSDtfsCounter, 2 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 04:07:07,821 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 40 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 184 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 04:07:07,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2024-11-14 04:07:07,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 23. [2024-11-14 04:07:07,828 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) [2024-11-14 04:07:07,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2024-11-14 04:07:07,828 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 17 [2024-11-14 04:07:07,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:07:07,828 INFO L471 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2024-11-14 04:07:07,828 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 29 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) [2024-11-14 04:07:07,828 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2024-11-14 04:07:07,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2024-11-14 04:07:07,829 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:07:07,829 INFO L215 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:07:07,841 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2024-11-14 04:07:08,029 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2024-11-14 04:07:08,029 INFO L396 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:07:08,030 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:07:08,030 INFO L85 PathProgramCache]: Analyzing trace with hash -1916656814, now seen corresponding path program 5 times [2024-11-14 04:07:08,030 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:07:08,030 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2032387181] [2024-11-14 04:07:08,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:07:08,030 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:07:08,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:07:08,768 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:08,769 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:07:08,769 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2032387181] [2024-11-14 04:07:08,769 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2032387181] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:07:08,769 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1610579316] [2024-11-14 04:07:08,769 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 04:07:08,769 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:07:08,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:07:08,773 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:07:08,774 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2024-11-14 04:07:08,828 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2024-11-14 04:07:08,828 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:07:08,830 INFO L255 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 38 conjuncts are in the unsatisfiable core [2024-11-14 04:07:08,831 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:07:09,490 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:09,490 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:07:10,206 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:10,207 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1610579316] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:07:10,207 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [157846712] [2024-11-14 04:07:10,208 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:07:10,209 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:07:10,209 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:07:10,209 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:07:10,209 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:07:10,347 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:07:11,168 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1384#(and (exists ((|v_ULTIMATE.start_student_version_~w#1_43| Int) (|v_ULTIMATE.start_student_version_~i~1#1_86| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_32| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_49| Int)) (and (<= 4 |v_ULTIMATE.start_student_version_~w#1_43|) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_32| 2147483647) (<= |v_ULTIMATE.start_student_version_~w#1_43| |v_ULTIMATE.start_student_version_~i~1#1_86|) (or (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_49| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_86| |v_ULTIMATE.start_student_version_~w#1_43|))) (and (= |v_ULTIMATE.start_student_version_~i~1#1_86| |v_ULTIMATE.start_student_version_~w#1_43|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_49| 1))) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_49| |v_ULTIMATE.start_main_~is_divisible1~0#1_32|)) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_32| 2147483648)))) (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0))' at error location [2024-11-14 04:07:11,168 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:07:11,168 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:07:11,168 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 38 [2024-11-14 04:07:11,168 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553348312] [2024-11-14 04:07:11,168 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:07:11,169 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2024-11-14 04:07:11,169 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:07:11,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2024-11-14 04:07:11,170 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2019, Unknown=0, NotChecked=0, Total=2162 [2024-11-14 04:07:11,170 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 38 states, 38 states have (on average 1.131578947368421) internal successors, (43), 38 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) [2024-11-14 04:07:12,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:07:12,235 INFO L93 Difference]: Finished difference Result 37 states and 41 transitions. [2024-11-14 04:07:12,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2024-11-14 04:07:12,235 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.131578947368421) internal successors, (43), 38 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) Word has length 18 [2024-11-14 04:07:12,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:07:12,236 INFO L225 Difference]: With dead ends: 37 [2024-11-14 04:07:12,236 INFO L226 Difference]: Without dead ends: 24 [2024-11-14 04:07:12,237 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 777 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=233, Invalid=2959, Unknown=0, NotChecked=0, Total=3192 [2024-11-14 04:07:12,239 INFO L432 NwaCegarLoop]: 5 mSDtfsCounter, 14 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 631 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 653 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 631 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 04:07:12,239 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 98 Invalid, 653 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 631 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 04:07:12,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2024-11-14 04:07:12,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2024-11-14 04:07:12,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 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) [2024-11-14 04:07:12,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2024-11-14 04:07:12,251 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 18 [2024-11-14 04:07:12,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:07:12,255 INFO L471 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2024-11-14 04:07:12,255 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.131578947368421) internal successors, (43), 38 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) [2024-11-14 04:07:12,255 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2024-11-14 04:07:12,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2024-11-14 04:07:12,255 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:07:12,256 INFO L215 NwaCegarLoop]: trace histogram [6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:07:12,277 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2024-11-14 04:07:12,456 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:07:12,456 INFO L396 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:07:12,457 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:07:12,457 INFO L85 PathProgramCache]: Analyzing trace with hash -286311310, now seen corresponding path program 6 times [2024-11-14 04:07:12,457 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:07:12,457 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [20846150] [2024-11-14 04:07:12,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:07:12,457 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:07:12,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:07:12,816 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:12,816 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:07:12,817 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [20846150] [2024-11-14 04:07:12,817 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [20846150] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:07:12,817 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [232246088] [2024-11-14 04:07:12,817 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 04:07:12,817 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:07:12,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:07:12,819 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:07:12,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2024-11-14 04:07:12,874 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 04:07:12,874 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:07:12,875 INFO L255 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 11 conjuncts are in the unsatisfiable core [2024-11-14 04:07:12,876 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:07:13,127 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 15 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-14 04:07:13,127 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:07:13,321 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 15 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-14 04:07:13,321 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [232246088] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:07:13,321 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2030552897] [2024-11-14 04:07:13,323 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:07:13,323 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:07:13,323 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:07:13,323 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:07:13,323 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:07:13,487 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:07:14,023 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1634#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0) (exists ((|v_ULTIMATE.start_student_version_~i~1#1_101| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_34| Int) (|v_ULTIMATE.start_student_version_~w#1_46| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_53| Int)) (and (<= 4 |v_ULTIMATE.start_student_version_~w#1_46|) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_34| 2147483648)) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_34| 2147483647) (or (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_53| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_101| |v_ULTIMATE.start_student_version_~w#1_46|))) (and (= |v_ULTIMATE.start_student_version_~i~1#1_101| |v_ULTIMATE.start_student_version_~w#1_46|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_53| 1))) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_53| |v_ULTIMATE.start_main_~is_divisible1~0#1_34|)) (<= |v_ULTIMATE.start_student_version_~w#1_46| |v_ULTIMATE.start_student_version_~i~1#1_101|))))' at error location [2024-11-14 04:07:14,023 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:07:14,023 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:07:14,023 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 11] total 26 [2024-11-14 04:07:14,023 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [804746965] [2024-11-14 04:07:14,023 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:07:14,024 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2024-11-14 04:07:14,024 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:07:14,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2024-11-14 04:07:14,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1028, Unknown=0, NotChecked=0, Total=1190 [2024-11-14 04:07:14,025 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 26 states, 26 states have (on average 1.3846153846153846) internal successors, (36), 26 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:07:14,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:07:14,137 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2024-11-14 04:07:14,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2024-11-14 04:07:14,138 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.3846153846153846) internal successors, (36), 26 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2024-11-14 04:07:14,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:07:14,138 INFO L225 Difference]: With dead ends: 33 [2024-11-14 04:07:14,138 INFO L226 Difference]: Without dead ends: 20 [2024-11-14 04:07:14,139 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=162, Invalid=1028, Unknown=0, NotChecked=0, Total=1190 [2024-11-14 04:07:14,139 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 6 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 04:07:14,140 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 33 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 130 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 04:07:14,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2024-11-14 04:07:14,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2024-11-14 04:07:14,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:07:14,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2024-11-14 04:07:14,147 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 18 [2024-11-14 04:07:14,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:07:14,147 INFO L471 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2024-11-14 04:07:14,147 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.3846153846153846) internal successors, (36), 26 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:07:14,147 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2024-11-14 04:07:14,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2024-11-14 04:07:14,147 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:07:14,148 INFO L215 NwaCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:07:14,175 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2024-11-14 04:07:14,348 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:07:14,349 INFO L396 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:07:14,349 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:07:14,349 INFO L85 PathProgramCache]: Analyzing trace with hash -318592378, now seen corresponding path program 7 times [2024-11-14 04:07:14,349 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:07:14,349 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1034268945] [2024-11-14 04:07:14,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:07:14,349 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:07:14,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:07:14,751 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:14,751 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:07:14,751 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1034268945] [2024-11-14 04:07:14,751 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1034268945] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:07:14,751 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [204353866] [2024-11-14 04:07:14,751 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 04:07:14,751 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:07:14,752 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:07:14,753 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:07:14,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2024-11-14 04:07:14,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:07:14,793 INFO L255 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 15 conjuncts are in the unsatisfiable core [2024-11-14 04:07:14,794 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:07:15,117 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:15,117 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:07:15,403 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:15,403 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [204353866] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:07:15,404 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1205758344] [2024-11-14 04:07:15,405 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:07:15,405 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:07:15,405 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:07:15,405 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:07:15,405 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:07:15,529 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:07:16,115 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1867#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (exists ((|v_ULTIMATE.start_student_version_~is_divisible~1#1_57| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_36| Int) (|v_ULTIMATE.start_student_version_~i~1#1_117| Int) (|v_ULTIMATE.start_student_version_~w#1_50| Int)) (and (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_36| 2147483648)) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_36| 2147483647) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_57| |v_ULTIMATE.start_main_~is_divisible1~0#1_36|)) (or (and (= |v_ULTIMATE.start_student_version_~i~1#1_117| |v_ULTIMATE.start_student_version_~w#1_50|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_57| 1)) (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_117| |v_ULTIMATE.start_student_version_~w#1_50|)) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_57| 0))) (<= |v_ULTIMATE.start_student_version_~w#1_50| |v_ULTIMATE.start_student_version_~i~1#1_117|) (<= 4 |v_ULTIMATE.start_student_version_~w#1_50|))) (= ~false~0 0))' at error location [2024-11-14 04:07:16,115 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:07:16,115 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:07:16,115 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 34 [2024-11-14 04:07:16,115 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [893971725] [2024-11-14 04:07:16,115 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:07:16,116 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2024-11-14 04:07:16,116 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:07:16,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2024-11-14 04:07:16,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=1542, Unknown=0, NotChecked=0, Total=1806 [2024-11-14 04:07:16,117 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 34 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:07:16,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:07:16,224 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2024-11-14 04:07:16,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2024-11-14 04:07:16,225 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 0 states have call successors, (0), 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 [2024-11-14 04:07:16,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:07:16,225 INFO L225 Difference]: With dead ends: 25 [2024-11-14 04:07:16,225 INFO L226 Difference]: Without dead ends: 21 [2024-11-14 04:07:16,226 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 25 SyntacticMatches, 5 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1037 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=285, Invalid=1607, Unknown=0, NotChecked=0, Total=1892 [2024-11-14 04:07:16,226 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 04:07:16,227 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 28 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 04:07:16,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2024-11-14 04:07:16,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2024-11-14 04:07:16,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.1) internal successors, (22), 20 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:07:16,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2024-11-14 04:07:16,234 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2024-11-14 04:07:16,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:07:16,234 INFO L471 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2024-11-14 04:07:16,234 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:07:16,235 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2024-11-14 04:07:16,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2024-11-14 04:07:16,235 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:07:16,235 INFO L215 NwaCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:07:16,253 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2024-11-14 04:07:16,435 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:07:16,436 INFO L396 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:07:16,436 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:07:16,436 INFO L85 PathProgramCache]: Analyzing trace with hash -1327730021, now seen corresponding path program 8 times [2024-11-14 04:07:16,436 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:07:16,436 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1095695075] [2024-11-14 04:07:16,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:07:16,436 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:07:16,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:07:17,146 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:17,146 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:07:17,146 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1095695075] [2024-11-14 04:07:17,146 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1095695075] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:07:17,147 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1719748807] [2024-11-14 04:07:17,147 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 04:07:17,147 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:07:17,147 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:07:17,149 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:07:17,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2024-11-14 04:07:17,191 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-11-14 04:07:17,191 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:07:17,192 INFO L255 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 43 conjuncts are in the unsatisfiable core [2024-11-14 04:07:17,194 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:07:18,465 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:18,465 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:07:19,533 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:19,537 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1719748807] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:07:19,537 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1419469030] [2024-11-14 04:07:19,542 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:07:19,542 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:07:19,542 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:07:19,542 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:07:19,542 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:07:19,719 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:07:20,658 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2113#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (exists ((|v_ULTIMATE.start_main_~is_divisible1~0#1_39| Int) (|v_ULTIMATE.start_student_version_~w#1_54| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_63| Int) (|v_ULTIMATE.start_student_version_~i~1#1_135| Int)) (and (<= |v_ULTIMATE.start_student_version_~w#1_54| |v_ULTIMATE.start_student_version_~i~1#1_135|) (<= 4 |v_ULTIMATE.start_student_version_~w#1_54|) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_63| |v_ULTIMATE.start_main_~is_divisible1~0#1_39|)) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_39| 2147483648)) (or (and (= |v_ULTIMATE.start_student_version_~i~1#1_135| |v_ULTIMATE.start_student_version_~w#1_54|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_63| 1)) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_63| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_135| |v_ULTIMATE.start_student_version_~w#1_54|)))) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_39| 2147483647))) (= ~false~0 0))' at error location [2024-11-14 04:07:20,658 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:07:20,658 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:07:20,658 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 51 [2024-11-14 04:07:20,658 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1420973176] [2024-11-14 04:07:20,658 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:07:20,659 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2024-11-14 04:07:20,659 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:07:20,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2024-11-14 04:07:20,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=3304, Unknown=0, NotChecked=0, Total=3540 [2024-11-14 04:07:20,661 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 51 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 51 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) [2024-11-14 04:07:21,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:07:21,760 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2024-11-14 04:07:21,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2024-11-14 04:07:21,761 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 51 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) Word has length 20 [2024-11-14 04:07:21,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:07:21,761 INFO L225 Difference]: With dead ends: 37 [2024-11-14 04:07:21,761 INFO L226 Difference]: Without dead ends: 22 [2024-11-14 04:07:21,762 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1463 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=339, Invalid=4773, Unknown=0, NotChecked=0, Total=5112 [2024-11-14 04:07:21,763 INFO L432 NwaCegarLoop]: 2 mSDtfsCounter, 20 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 626 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 630 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 626 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-11-14 04:07:21,763 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 59 Invalid, 630 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 626 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-11-14 04:07:21,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2024-11-14 04:07:21,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2024-11-14 04:07:21,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 21 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) [2024-11-14 04:07:21,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2024-11-14 04:07:21,772 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 20 [2024-11-14 04:07:21,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:07:21,772 INFO L471 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2024-11-14 04:07:21,772 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 51 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) [2024-11-14 04:07:21,772 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2024-11-14 04:07:21,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2024-11-14 04:07:21,773 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:07:21,773 INFO L215 NwaCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:07:21,793 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2024-11-14 04:07:21,973 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:07:21,973 INFO L396 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:07:21,974 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:07:21,974 INFO L85 PathProgramCache]: Analyzing trace with hash 1108868303, now seen corresponding path program 9 times [2024-11-14 04:07:21,974 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:07:21,974 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [900795029] [2024-11-14 04:07:21,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:07:21,974 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:07:21,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:07:22,437 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:22,437 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:07:22,437 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [900795029] [2024-11-14 04:07:22,437 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [900795029] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:07:22,437 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1452682379] [2024-11-14 04:07:22,437 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 04:07:22,437 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:07:22,437 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:07:22,439 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:07:22,440 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2024-11-14 04:07:22,481 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 04:07:22,481 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:07:22,482 INFO L255 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 17 conjuncts are in the unsatisfiable core [2024-11-14 04:07:22,483 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:07:22,850 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:22,850 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:07:23,173 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:23,173 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1452682379] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:07:23,173 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [917200337] [2024-11-14 04:07:23,175 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:07:23,175 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:07:23,175 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:07:23,175 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:07:23,175 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:07:23,304 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:07:23,952 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2397#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (exists ((|v_ULTIMATE.start_student_version_~is_divisible~1#1_67| Int) (|v_ULTIMATE.start_student_version_~w#1_58| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_41| Int) (|v_ULTIMATE.start_student_version_~i~1#1_152| Int)) (and (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_67| |v_ULTIMATE.start_main_~is_divisible1~0#1_41|)) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_41| 2147483647) (<= 4 |v_ULTIMATE.start_student_version_~w#1_58|) (or (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_67| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_152| |v_ULTIMATE.start_student_version_~w#1_58|)) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_67| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_152| |v_ULTIMATE.start_student_version_~w#1_58|)))) (<= |v_ULTIMATE.start_student_version_~w#1_58| |v_ULTIMATE.start_student_version_~i~1#1_152|) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_41| 2147483648)))) (= ~false~0 0))' at error location [2024-11-14 04:07:23,952 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:07:23,952 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:07:23,952 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 39 [2024-11-14 04:07:23,953 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816409413] [2024-11-14 04:07:23,953 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:07:23,953 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2024-11-14 04:07:23,953 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:07:23,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2024-11-14 04:07:23,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=332, Invalid=1924, Unknown=0, NotChecked=0, Total=2256 [2024-11-14 04:07:23,954 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 39 states, 39 states have (on average 1.205128205128205) internal successors, (47), 39 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) [2024-11-14 04:07:24,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:07:24,125 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2024-11-14 04:07:24,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2024-11-14 04:07:24,125 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.205128205128205) internal successors, (47), 39 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 21 [2024-11-14 04:07:24,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:07:24,126 INFO L225 Difference]: With dead ends: 27 [2024-11-14 04:07:24,126 INFO L226 Difference]: Without dead ends: 23 [2024-11-14 04:07:24,127 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 27 SyntacticMatches, 6 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1347 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=356, Invalid=1996, Unknown=0, NotChecked=0, Total=2352 [2024-11-14 04:07:24,127 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 04:07:24,127 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 34 Invalid, 186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 04:07:24,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2024-11-14 04:07:24,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2024-11-14 04:07:24,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:07:24,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2024-11-14 04:07:24,136 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 21 [2024-11-14 04:07:24,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:07:24,136 INFO L471 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2024-11-14 04:07:24,136 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.205128205128205) internal successors, (47), 39 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) [2024-11-14 04:07:24,136 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2024-11-14 04:07:24,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2024-11-14 04:07:24,137 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:07:24,137 INFO L215 NwaCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:07:24,157 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2024-11-14 04:07:24,337 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2024-11-14 04:07:24,338 INFO L396 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:07:24,338 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:07:24,338 INFO L85 PathProgramCache]: Analyzing trace with hash -26121870, now seen corresponding path program 10 times [2024-11-14 04:07:24,338 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:07:24,338 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1655464745] [2024-11-14 04:07:24,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:07:24,338 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:07:24,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:07:25,255 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:25,255 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:07:25,256 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1655464745] [2024-11-14 04:07:25,256 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1655464745] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:07:25,256 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [401922417] [2024-11-14 04:07:25,256 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 04:07:25,256 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:07:25,256 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:07:25,258 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:07:25,258 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2024-11-14 04:07:25,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:07:25,305 INFO L255 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 44 conjuncts are in the unsatisfiable core [2024-11-14 04:07:25,306 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:07:26,211 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:26,212 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:07:27,239 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:27,239 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [401922417] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:07:27,239 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1503536380] [2024-11-14 04:07:27,240 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:07:27,240 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:07:27,241 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:07:27,241 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:07:27,241 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:07:27,352 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:07:28,318 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2660#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_student_version_~w#1_62| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_73| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_44| Int) (|v_ULTIMATE.start_student_version_~i~1#1_172| Int)) (and (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_44| 2147483648)) (<= |v_ULTIMATE.start_student_version_~w#1_62| |v_ULTIMATE.start_student_version_~i~1#1_172|) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_44| 2147483647) (<= 4 |v_ULTIMATE.start_student_version_~w#1_62|) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_73| |v_ULTIMATE.start_main_~is_divisible1~0#1_44|)) (or (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_172| |v_ULTIMATE.start_student_version_~w#1_62|)) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_73| 0)) (and (= |v_ULTIMATE.start_student_version_~i~1#1_172| |v_ULTIMATE.start_student_version_~w#1_62|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_73| 1))))) (= ~true~0 1) (= ~false~0 0))' at error location [2024-11-14 04:07:28,318 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:07:28,318 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:07:28,318 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 48 [2024-11-14 04:07:28,318 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377885071] [2024-11-14 04:07:28,318 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:07:28,318 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2024-11-14 04:07:28,319 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:07:28,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2024-11-14 04:07:28,320 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=3017, Unknown=0, NotChecked=0, Total=3192 [2024-11-14 04:07:28,320 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 48 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 48 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) [2024-11-14 04:07:29,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:07:29,658 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2024-11-14 04:07:29,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2024-11-14 04:07:29,658 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 48 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) Word has length 22 [2024-11-14 04:07:29,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:07:29,659 INFO L225 Difference]: With dead ends: 39 [2024-11-14 04:07:29,659 INFO L226 Difference]: Without dead ends: 24 [2024-11-14 04:07:29,660 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1182 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=291, Invalid=4401, Unknown=0, NotChecked=0, Total=4692 [2024-11-14 04:07:29,661 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 742 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 772 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 742 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-11-14 04:07:29,661 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 78 Invalid, 772 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 742 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-11-14 04:07:29,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2024-11-14 04:07:29,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2024-11-14 04:07:29,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 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) [2024-11-14 04:07:29,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2024-11-14 04:07:29,671 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 22 [2024-11-14 04:07:29,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:07:29,671 INFO L471 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2024-11-14 04:07:29,672 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 48 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) [2024-11-14 04:07:29,672 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2024-11-14 04:07:29,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2024-11-14 04:07:29,672 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:07:29,672 INFO L215 NwaCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:07:29,693 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2024-11-14 04:07:29,873 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2024-11-14 04:07:29,873 INFO L396 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:07:29,873 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:07:29,873 INFO L85 PathProgramCache]: Analyzing trace with hash 787691174, now seen corresponding path program 11 times [2024-11-14 04:07:29,873 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:07:29,874 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [569301944] [2024-11-14 04:07:29,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:07:29,874 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:07:29,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:07:30,396 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:30,396 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:07:30,396 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [569301944] [2024-11-14 04:07:30,396 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [569301944] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:07:30,396 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1426893518] [2024-11-14 04:07:30,396 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 04:07:30,397 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:07:30,397 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:07:30,399 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:07:30,401 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2024-11-14 04:07:30,459 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2024-11-14 04:07:30,460 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:07:30,461 INFO L255 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 19 conjuncts are in the unsatisfiable core [2024-11-14 04:07:30,464 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:07:30,914 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:30,914 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:07:31,299 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:31,299 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1426893518] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:07:31,299 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [670960761] [2024-11-14 04:07:31,300 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:07:31,300 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:07:31,301 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:07:31,301 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:07:31,301 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:07:31,393 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:07:31,998 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2970#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (exists ((|v_ULTIMATE.start_student_version_~is_divisible~1#1_77| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_46| Int) (|v_ULTIMATE.start_student_version_~w#1_66| Int) (|v_ULTIMATE.start_student_version_~i~1#1_192| Int)) (and (or (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_77| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_192| |v_ULTIMATE.start_student_version_~w#1_66|)) (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_192| |v_ULTIMATE.start_student_version_~w#1_66|)) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_77| 0))) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_46| 2147483648)) (<= 4 |v_ULTIMATE.start_student_version_~w#1_66|) (<= |v_ULTIMATE.start_student_version_~w#1_66| |v_ULTIMATE.start_student_version_~i~1#1_192|) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_46| 2147483647) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_77| |v_ULTIMATE.start_main_~is_divisible1~0#1_46|)))) (= ~false~0 0))' at error location [2024-11-14 04:07:31,998 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:07:31,998 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:07:31,998 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 44 [2024-11-14 04:07:31,998 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370398411] [2024-11-14 04:07:31,998 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:07:31,999 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2024-11-14 04:07:31,999 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:07:31,999 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2024-11-14 04:07:32,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=409, Invalid=2347, Unknown=0, NotChecked=0, Total=2756 [2024-11-14 04:07:32,000 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 44 states, 44 states have (on average 1.1818181818181819) internal successors, (52), 44 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:07:32,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:07:32,156 INFO L93 Difference]: Finished difference Result 29 states and 30 transitions. [2024-11-14 04:07:32,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2024-11-14 04:07:32,157 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.1818181818181819) internal successors, (52), 44 states have internal predecessors, (52), 0 states have call successors, (0), 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 23 [2024-11-14 04:07:32,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:07:32,157 INFO L225 Difference]: With dead ends: 29 [2024-11-14 04:07:32,157 INFO L226 Difference]: Without dead ends: 25 [2024-11-14 04:07:32,158 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 29 SyntacticMatches, 7 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1696 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=436, Invalid=2426, Unknown=0, NotChecked=0, Total=2862 [2024-11-14 04:07:32,158 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 04:07:32,158 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 37 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 216 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 04:07:32,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2024-11-14 04:07:32,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2024-11-14 04:07:32,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 24 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) [2024-11-14 04:07:32,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2024-11-14 04:07:32,166 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 23 [2024-11-14 04:07:32,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:07:32,166 INFO L471 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2024-11-14 04:07:32,166 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.1818181818181819) internal successors, (52), 44 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:07:32,167 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2024-11-14 04:07:32,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2024-11-14 04:07:32,167 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:07:32,167 INFO L215 NwaCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:07:32,183 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2024-11-14 04:07:32,367 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2024-11-14 04:07:32,368 INFO L396 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:07:32,368 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:07:32,368 INFO L85 PathProgramCache]: Analyzing trace with hash -1392678277, now seen corresponding path program 12 times [2024-11-14 04:07:32,368 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:07:32,368 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1621589076] [2024-11-14 04:07:32,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:07:32,368 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:07:32,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:07:33,289 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:33,290 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:07:33,290 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1621589076] [2024-11-14 04:07:33,290 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1621589076] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:07:33,290 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [667074839] [2024-11-14 04:07:33,290 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 04:07:33,290 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:07:33,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:07:33,292 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:07:33,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2024-11-14 04:07:33,340 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 04:07:33,340 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:07:33,341 WARN L253 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 52 conjuncts are in the unsatisfiable core [2024-11-14 04:07:33,343 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:07:34,373 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:34,373 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:07:35,858 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:35,858 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [667074839] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:07:35,858 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1152412718] [2024-11-14 04:07:35,860 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:07:35,860 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:07:35,860 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:07:35,860 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:07:35,860 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:07:35,975 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:07:37,003 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3259#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (exists ((|v_ULTIMATE.start_main_~is_divisible1~0#1_49| Int) (|v_ULTIMATE.start_student_version_~i~1#1_213| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_83| Int) (|v_ULTIMATE.start_student_version_~w#1_70| Int)) (and (or (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_83| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_213| |v_ULTIMATE.start_student_version_~w#1_70|))) (and (= |v_ULTIMATE.start_student_version_~i~1#1_213| |v_ULTIMATE.start_student_version_~w#1_70|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_83| 1))) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_49| 2147483647) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_49| 2147483648)) (<= |v_ULTIMATE.start_student_version_~w#1_70| |v_ULTIMATE.start_student_version_~i~1#1_213|) (<= 4 |v_ULTIMATE.start_student_version_~w#1_70|) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_83| |v_ULTIMATE.start_main_~is_divisible1~0#1_49|)))) (= ~false~0 0))' at error location [2024-11-14 04:07:37,003 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:07:37,003 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:07:37,003 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 54 [2024-11-14 04:07:37,003 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655839060] [2024-11-14 04:07:37,003 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:07:37,004 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2024-11-14 04:07:37,004 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:07:37,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2024-11-14 04:07:37,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=3682, Unknown=0, NotChecked=0, Total=3906 [2024-11-14 04:07:37,005 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand has 54 states, 54 states have (on average 1.0740740740740742) internal successors, (58), 54 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:07:39,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:07:39,988 INFO L93 Difference]: Finished difference Result 62 states and 75 transitions. [2024-11-14 04:07:39,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2024-11-14 04:07:39,988 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.0740740740740742) internal successors, (58), 54 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2024-11-14 04:07:39,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:07:39,990 INFO L225 Difference]: With dead ends: 62 [2024-11-14 04:07:39,990 INFO L226 Difference]: Without dead ends: 45 [2024-11-14 04:07:39,992 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1974 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=439, Invalid=6701, Unknown=0, NotChecked=0, Total=7140 [2024-11-14 04:07:39,993 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 39 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 759 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 777 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 759 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-11-14 04:07:39,993 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 82 Invalid, 777 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 759 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2024-11-14 04:07:39,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2024-11-14 04:07:40,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 37. [2024-11-14 04:07:40,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.2777777777777777) internal successors, (46), 36 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:07:40,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2024-11-14 04:07:40,016 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 24 [2024-11-14 04:07:40,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:07:40,016 INFO L471 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2024-11-14 04:07:40,016 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 1.0740740740740742) internal successors, (58), 54 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:07:40,016 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2024-11-14 04:07:40,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2024-11-14 04:07:40,017 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:07:40,017 INFO L215 NwaCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:07:40,037 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2024-11-14 04:07:40,217 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2024-11-14 04:07:40,217 INFO L396 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:07:40,218 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:07:40,218 INFO L85 PathProgramCache]: Analyzing trace with hash -1050646638, now seen corresponding path program 13 times [2024-11-14 04:07:40,218 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:07:40,218 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2113846196] [2024-11-14 04:07:40,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:07:40,218 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:07:40,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:07:41,343 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:41,343 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:07:41,343 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2113846196] [2024-11-14 04:07:41,343 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2113846196] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:07:41,343 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [707159476] [2024-11-14 04:07:41,343 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 04:07:41,343 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:07:41,344 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:07:41,346 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:07:41,349 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2024-11-14 04:07:41,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:07:41,419 INFO L255 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 52 conjuncts are in the unsatisfiable core [2024-11-14 04:07:41,421 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:07:42,604 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:42,605 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:07:44,056 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:44,056 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [707159476] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:07:44,056 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [858395182] [2024-11-14 04:07:44,057 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:07:44,057 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:07:44,058 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:07:44,058 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:07:44,058 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:07:44,192 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:07:45,199 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3688#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_student_version_~is_divisible~1#1_89| Int) (|v_ULTIMATE.start_student_version_~w#1_74| Int) (|v_ULTIMATE.start_student_version_~i~1#1_236| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_52| Int)) (and (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_89| |v_ULTIMATE.start_main_~is_divisible1~0#1_52|)) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_52| 2147483648)) (<= 4 |v_ULTIMATE.start_student_version_~w#1_74|) (<= |v_ULTIMATE.start_student_version_~w#1_74| |v_ULTIMATE.start_student_version_~i~1#1_236|) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_52| 2147483647) (or (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_89| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_236| |v_ULTIMATE.start_student_version_~w#1_74|))) (and (= |v_ULTIMATE.start_student_version_~i~1#1_236| |v_ULTIMATE.start_student_version_~w#1_74|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_89| 1))))) (= ~true~0 1) (= ~false~0 0))' at error location [2024-11-14 04:07:45,199 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:07:45,199 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:07:45,199 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 58 [2024-11-14 04:07:45,200 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1227366664] [2024-11-14 04:07:45,200 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:07:45,200 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2024-11-14 04:07:45,200 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:07:45,200 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2024-11-14 04:07:45,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=4215, Unknown=0, NotChecked=0, Total=4422 [2024-11-14 04:07:45,202 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand has 58 states, 58 states have (on average 1.0862068965517242) internal successors, (63), 58 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:07:47,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:07:47,165 INFO L93 Difference]: Finished difference Result 54 states and 64 transitions. [2024-11-14 04:07:47,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2024-11-14 04:07:47,166 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.0862068965517242) internal successors, (63), 58 states have internal predecessors, (63), 0 states have call successors, (0), 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 26 [2024-11-14 04:07:47,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:07:47,166 INFO L225 Difference]: With dead ends: 54 [2024-11-14 04:07:47,167 INFO L226 Difference]: Without dead ends: 37 [2024-11-14 04:07:47,167 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1651 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=349, Invalid=6131, Unknown=0, NotChecked=0, Total=6480 [2024-11-14 04:07:47,168 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 18 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 1187 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 1225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 1187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2024-11-14 04:07:47,168 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 105 Invalid, 1225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 1187 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2024-11-14 04:07:47,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2024-11-14 04:07:47,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2024-11-14 04:07:47,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.25) internal successors, (45), 36 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:07:47,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2024-11-14 04:07:47,191 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 26 [2024-11-14 04:07:47,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:07:47,192 INFO L471 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2024-11-14 04:07:47,192 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 1.0862068965517242) internal successors, (63), 58 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:07:47,192 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2024-11-14 04:07:47,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2024-11-14 04:07:47,192 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:07:47,192 INFO L215 NwaCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:07:47,206 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2024-11-14 04:07:47,394 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:07:47,394 INFO L396 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:07:47,394 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:07:47,394 INFO L85 PathProgramCache]: Analyzing trace with hash 353401542, now seen corresponding path program 14 times [2024-11-14 04:07:47,394 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:07:47,394 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1599134218] [2024-11-14 04:07:47,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:07:47,395 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:07:47,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:07:48,103 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:48,103 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:07:48,103 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1599134218] [2024-11-14 04:07:48,103 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1599134218] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:07:48,103 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1029871964] [2024-11-14 04:07:48,104 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 04:07:48,104 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:07:48,104 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:07:48,106 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:07:48,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2024-11-14 04:07:48,163 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2024-11-14 04:07:48,163 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:07:48,164 INFO L255 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 23 conjuncts are in the unsatisfiable core [2024-11-14 04:07:48,166 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:07:48,852 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:48,852 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:07:49,448 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:49,448 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1029871964] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:07:49,448 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1134885898] [2024-11-14 04:07:49,449 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:07:49,449 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:07:49,450 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:07:49,450 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:07:49,450 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:07:49,589 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:07:50,251 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4088#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (exists ((|v_ULTIMATE.start_student_version_~i~1#1_259| Int) (|v_ULTIMATE.start_student_version_~w#1_78| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_54| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_93| Int)) (and (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_54| 2147483648)) (or (and (= |v_ULTIMATE.start_student_version_~i~1#1_259| |v_ULTIMATE.start_student_version_~w#1_78|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_93| 1)) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_93| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_259| |v_ULTIMATE.start_student_version_~w#1_78|)))) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_54| 2147483647) (<= |v_ULTIMATE.start_student_version_~w#1_78| |v_ULTIMATE.start_student_version_~i~1#1_259|) (<= 4 |v_ULTIMATE.start_student_version_~w#1_78|) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_93| |v_ULTIMATE.start_main_~is_divisible1~0#1_54|)))) (= ~false~0 0))' at error location [2024-11-14 04:07:50,252 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:07:50,252 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:07:50,252 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 54 [2024-11-14 04:07:50,252 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188660996] [2024-11-14 04:07:50,252 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:07:50,252 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2024-11-14 04:07:50,252 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:07:50,253 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2024-11-14 04:07:50,253 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=590, Invalid=3316, Unknown=0, NotChecked=0, Total=3906 [2024-11-14 04:07:50,254 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand has 54 states, 54 states have (on average 1.1481481481481481) internal successors, (62), 54 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) [2024-11-14 04:07:50,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:07:50,461 INFO L93 Difference]: Finished difference Result 50 states and 59 transitions. [2024-11-14 04:07:50,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2024-11-14 04:07:50,462 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.1481481481481481) internal successors, (62), 54 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 27 [2024-11-14 04:07:50,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:07:50,462 INFO L225 Difference]: With dead ends: 50 [2024-11-14 04:07:50,463 INFO L226 Difference]: Without dead ends: 46 [2024-11-14 04:07:50,463 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 33 SyntacticMatches, 9 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2511 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=623, Invalid=3409, Unknown=0, NotChecked=0, Total=4032 [2024-11-14 04:07:50,464 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 04:07:50,464 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 41 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 257 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 04:07:50,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2024-11-14 04:07:50,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 29. [2024-11-14 04:07:50,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 28 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:07:50,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2024-11-14 04:07:50,480 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 27 [2024-11-14 04:07:50,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:07:50,480 INFO L471 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2024-11-14 04:07:50,481 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 1.1481481481481481) internal successors, (62), 54 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) [2024-11-14 04:07:50,481 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2024-11-14 04:07:50,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2024-11-14 04:07:50,481 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:07:50,481 INFO L215 NwaCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:07:50,501 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2024-11-14 04:07:50,685 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:07:50,685 INFO L396 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:07:50,685 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:07:50,685 INFO L85 PathProgramCache]: Analyzing trace with hash -1970754981, now seen corresponding path program 15 times [2024-11-14 04:07:50,685 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:07:50,686 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1609028356] [2024-11-14 04:07:50,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:07:50,686 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:07:50,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:07:51,773 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:51,773 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:07:51,773 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1609028356] [2024-11-14 04:07:51,773 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1609028356] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:07:51,773 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [141092909] [2024-11-14 04:07:51,773 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 04:07:51,774 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:07:51,774 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:07:51,775 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:07:51,776 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2024-11-14 04:07:51,825 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 04:07:51,825 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:07:51,827 WARN L253 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 62 conjuncts are in the unsatisfiable core [2024-11-14 04:07:51,829 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:07:54,080 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:54,080 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:07:56,552 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:07:56,553 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [141092909] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:07:56,553 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1146400639] [2024-11-14 04:07:56,554 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:07:56,554 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:07:56,554 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:07:56,554 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:07:56,554 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:07:56,683 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:07:57,991 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4470#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0) (exists ((|v_ULTIMATE.start_student_version_~is_divisible~1#1_99| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_57| Int) (|v_ULTIMATE.start_student_version_~w#1_82| Int) (|v_ULTIMATE.start_student_version_~i~1#1_284| Int)) (and (<= 4 |v_ULTIMATE.start_student_version_~w#1_82|) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_99| |v_ULTIMATE.start_main_~is_divisible1~0#1_57|)) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_57| 2147483647) (or (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_284| |v_ULTIMATE.start_student_version_~w#1_82|)) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_99| 0)) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_99| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_284| |v_ULTIMATE.start_student_version_~w#1_82|))) (<= |v_ULTIMATE.start_student_version_~w#1_82| |v_ULTIMATE.start_student_version_~i~1#1_284|) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_57| 2147483648)))))' at error location [2024-11-14 04:07:57,991 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:07:57,991 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:07:57,991 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 75 [2024-11-14 04:07:57,991 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579297642] [2024-11-14 04:07:57,992 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:07:57,992 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2024-11-14 04:07:57,992 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:07:57,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2024-11-14 04:07:57,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=365, Invalid=6607, Unknown=0, NotChecked=0, Total=6972 [2024-11-14 04:07:57,993 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand has 75 states, 75 states have (on average 1.0533333333333332) internal successors, (79), 75 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) [2024-11-14 04:08:02,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:08:02,329 INFO L93 Difference]: Finished difference Result 73 states and 88 transitions. [2024-11-14 04:08:02,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2024-11-14 04:08:02,329 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 1.0533333333333332) internal successors, (79), 75 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) Word has length 28 [2024-11-14 04:08:02,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:08:02,330 INFO L225 Difference]: With dead ends: 73 [2024-11-14 04:08:02,330 INFO L226 Difference]: Without dead ends: 54 [2024-11-14 04:08:02,331 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3926 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=761, Invalid=12579, Unknown=0, NotChecked=0, Total=13340 [2024-11-14 04:08:02,331 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 108 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 1311 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 1431 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 1311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2024-11-14 04:08:02,332 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [108 Valid, 113 Invalid, 1431 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 1311 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2024-11-14 04:08:02,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2024-11-14 04:08:02,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 43. [2024-11-14 04:08:02,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.2857142857142858) internal successors, (54), 42 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:08:02,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 54 transitions. [2024-11-14 04:08:02,357 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 54 transitions. Word has length 28 [2024-11-14 04:08:02,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:08:02,357 INFO L471 AbstractCegarLoop]: Abstraction has 43 states and 54 transitions. [2024-11-14 04:08:02,357 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 75 states have (on average 1.0533333333333332) internal successors, (79), 75 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) [2024-11-14 04:08:02,358 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 54 transitions. [2024-11-14 04:08:02,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2024-11-14 04:08:02,358 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:08:02,358 INFO L215 NwaCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:08:02,373 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2024-11-14 04:08:02,558 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:08:02,559 INFO L396 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:08:02,559 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:08:02,559 INFO L85 PathProgramCache]: Analyzing trace with hash -1692328526, now seen corresponding path program 16 times [2024-11-14 04:08:02,559 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:08:02,559 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1860401711] [2024-11-14 04:08:02,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:08:02,559 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:08:02,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:08:03,879 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:08:03,879 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:08:03,879 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1860401711] [2024-11-14 04:08:03,880 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1860401711] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:08:03,880 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2042329019] [2024-11-14 04:08:03,880 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 04:08:03,880 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:08:03,880 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:08:03,882 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:08:03,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2024-11-14 04:08:03,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:08:03,934 WARN L253 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 60 conjuncts are in the unsatisfiable core [2024-11-14 04:08:03,935 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:08:05,382 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:08:05,382 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:08:07,197 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:08:07,197 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2042329019] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:08:07,197 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [276446665] [2024-11-14 04:08:07,198 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:08:07,198 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:08:07,198 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:08:07,198 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:08:07,198 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:08:07,279 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:08:08,404 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4986#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_student_version_~w#1_86| Int) (|v_ULTIMATE.start_student_version_~i~1#1_311| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_105| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_60| Int)) (and (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_105| |v_ULTIMATE.start_main_~is_divisible1~0#1_60|)) (<= |v_ULTIMATE.start_student_version_~w#1_86| |v_ULTIMATE.start_student_version_~i~1#1_311|) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_60| 2147483648)) (or (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_311| |v_ULTIMATE.start_student_version_~w#1_86|)) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_105| 0)) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_105| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_311| |v_ULTIMATE.start_student_version_~w#1_86|))) (<= 4 |v_ULTIMATE.start_student_version_~w#1_86|) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_60| 2147483647))) (= ~true~0 1) (= ~false~0 0))' at error location [2024-11-14 04:08:08,404 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:08:08,404 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:08:08,405 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 68 [2024-11-14 04:08:08,405 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958990305] [2024-11-14 04:08:08,405 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:08:08,405 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2024-11-14 04:08:08,405 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:08:08,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2024-11-14 04:08:08,406 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=5613, Unknown=0, NotChecked=0, Total=5852 [2024-11-14 04:08:08,406 INFO L87 Difference]: Start difference. First operand 43 states and 54 transitions. Second operand has 68 states, 68 states have (on average 1.0735294117647058) internal successors, (73), 68 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) [2024-11-14 04:08:10,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:08:10,923 INFO L93 Difference]: Finished difference Result 62 states and 74 transitions. [2024-11-14 04:08:10,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2024-11-14 04:08:10,925 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 1.0735294117647058) internal successors, (73), 68 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) Word has length 30 [2024-11-14 04:08:10,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:08:10,926 INFO L225 Difference]: With dead ends: 62 [2024-11-14 04:08:10,926 INFO L226 Difference]: Without dead ends: 43 [2024-11-14 04:08:10,927 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2196 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=407, Invalid=8149, Unknown=0, NotChecked=0, Total=8556 [2024-11-14 04:08:10,928 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 1668 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 1714 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 1668 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2024-11-14 04:08:10,929 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 128 Invalid, 1714 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 1668 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2024-11-14 04:08:10,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2024-11-14 04:08:10,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2024-11-14 04:08:10,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.2619047619047619) internal successors, (53), 42 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) [2024-11-14 04:08:10,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 53 transitions. [2024-11-14 04:08:10,971 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 53 transitions. Word has length 30 [2024-11-14 04:08:10,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:08:10,971 INFO L471 AbstractCegarLoop]: Abstraction has 43 states and 53 transitions. [2024-11-14 04:08:10,971 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 1.0735294117647058) internal successors, (73), 68 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) [2024-11-14 04:08:10,971 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 53 transitions. [2024-11-14 04:08:10,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2024-11-14 04:08:10,972 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:08:10,972 INFO L215 NwaCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:08:10,991 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2024-11-14 04:08:11,172 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2024-11-14 04:08:11,172 INFO L396 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:08:11,173 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:08:11,173 INFO L85 PathProgramCache]: Analyzing trace with hash -1519618330, now seen corresponding path program 17 times [2024-11-14 04:08:11,173 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:08:11,173 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1637799391] [2024-11-14 04:08:11,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:08:11,173 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:08:11,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:08:11,971 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:08:11,971 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:08:11,971 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1637799391] [2024-11-14 04:08:11,971 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1637799391] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:08:11,971 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1066257772] [2024-11-14 04:08:11,971 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 04:08:11,971 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:08:11,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:08:11,974 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:08:11,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2024-11-14 04:08:12,031 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2024-11-14 04:08:12,031 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:08:12,032 INFO L255 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 27 conjuncts are in the unsatisfiable core [2024-11-14 04:08:12,033 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:08:12,786 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:08:12,786 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:08:13,477 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:08:13,477 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1066257772] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:08:13,477 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1602757402] [2024-11-14 04:08:13,479 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:08:13,480 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:08:13,480 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:08:13,480 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:08:13,480 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:08:13,624 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:08:14,445 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5452#(and (exists ((|v_ULTIMATE.start_student_version_~is_divisible~1#1_109| Int) (|v_ULTIMATE.start_student_version_~w#1_90| Int) (|v_ULTIMATE.start_student_version_~i~1#1_339| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_62| Int)) (and (<= |v_ULTIMATE.start_student_version_~w#1_90| |v_ULTIMATE.start_student_version_~i~1#1_339|) (<= 4 |v_ULTIMATE.start_student_version_~w#1_90|) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_62| 2147483648)) (or (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_339| |v_ULTIMATE.start_student_version_~w#1_90|)) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_109| 0)) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_109| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_339| |v_ULTIMATE.start_student_version_~w#1_90|))) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_109| |v_ULTIMATE.start_main_~is_divisible1~0#1_62|)) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_62| 2147483647))) (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0))' at error location [2024-11-14 04:08:14,445 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:08:14,445 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:08:14,445 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 27] total 64 [2024-11-14 04:08:14,445 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302981125] [2024-11-14 04:08:14,445 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:08:14,445 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2024-11-14 04:08:14,445 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:08:14,446 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2024-11-14 04:08:14,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=807, Invalid=4449, Unknown=0, NotChecked=0, Total=5256 [2024-11-14 04:08:14,447 INFO L87 Difference]: Start difference. First operand 43 states and 53 transitions. Second operand has 64 states, 64 states have (on average 1.125) internal successors, (72), 64 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:08:14,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:08:14,634 INFO L93 Difference]: Finished difference Result 58 states and 69 transitions. [2024-11-14 04:08:14,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2024-11-14 04:08:14,635 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 1.125) internal successors, (72), 64 states have internal predecessors, (72), 0 states have call successors, (0), 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 [2024-11-14 04:08:14,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:08:14,635 INFO L225 Difference]: With dead ends: 58 [2024-11-14 04:08:14,635 INFO L226 Difference]: Without dead ends: 54 [2024-11-14 04:08:14,636 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 37 SyntacticMatches, 11 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3482 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=846, Invalid=4556, Unknown=0, NotChecked=0, Total=5402 [2024-11-14 04:08:14,636 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 04:08:14,636 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 16 Invalid, 199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 199 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 04:08:14,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2024-11-14 04:08:14,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 33. [2024-11-14 04:08:14,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.0625) internal successors, (34), 32 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:08:14,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2024-11-14 04:08:14,662 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 31 [2024-11-14 04:08:14,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:08:14,662 INFO L471 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2024-11-14 04:08:14,662 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 1.125) internal successors, (72), 64 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:08:14,662 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2024-11-14 04:08:14,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2024-11-14 04:08:14,663 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:08:14,663 INFO L215 NwaCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:08:14,678 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2024-11-14 04:08:14,863 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2024-11-14 04:08:14,863 INFO L396 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:08:14,864 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:08:14,864 INFO L85 PathProgramCache]: Analyzing trace with hash 95171131, now seen corresponding path program 18 times [2024-11-14 04:08:14,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:08:14,864 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [507406596] [2024-11-14 04:08:14,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:08:14,864 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:08:14,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:08:16,136 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:08:16,136 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:08:16,136 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [507406596] [2024-11-14 04:08:16,137 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [507406596] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:08:16,137 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [304508818] [2024-11-14 04:08:16,137 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 04:08:16,137 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:08:16,137 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:08:16,139 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:08:16,140 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2024-11-14 04:08:16,187 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 04:08:16,187 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:08:16,188 WARN L253 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 66 conjuncts are in the unsatisfiable core [2024-11-14 04:08:16,190 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:08:17,799 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:08:17,799 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:08:19,924 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:08:19,925 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [304508818] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:08:19,925 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2101883596] [2024-11-14 04:08:19,926 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:08:19,926 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:08:19,926 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:08:19,926 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:08:19,926 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:08:20,014 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:08:21,221 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5880#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0) (exists ((|v_ULTIMATE.start_student_version_~is_divisible~1#1_115| Int) (|v_ULTIMATE.start_student_version_~i~1#1_368| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_65| Int) (|v_ULTIMATE.start_student_version_~w#1_94| Int)) (and (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_115| |v_ULTIMATE.start_main_~is_divisible1~0#1_65|)) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_65| 2147483647) (<= 4 |v_ULTIMATE.start_student_version_~w#1_94|) (or (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_115| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_368| |v_ULTIMATE.start_student_version_~w#1_94|)) (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_368| |v_ULTIMATE.start_student_version_~w#1_94|)) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_115| 0))) (<= |v_ULTIMATE.start_student_version_~w#1_94| |v_ULTIMATE.start_student_version_~i~1#1_368|) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_65| 2147483648)))))' at error location [2024-11-14 04:08:21,221 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:08:21,221 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:08:21,221 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 73 [2024-11-14 04:08:21,222 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146949753] [2024-11-14 04:08:21,222 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:08:21,222 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2024-11-14 04:08:21,222 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:08:21,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2024-11-14 04:08:21,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=6387, Unknown=0, NotChecked=0, Total=6642 [2024-11-14 04:08:21,223 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand has 73 states, 73 states have (on average 1.0684931506849316) internal successors, (78), 73 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:08:24,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:08:24,036 INFO L93 Difference]: Finished difference Result 54 states and 57 transitions. [2024-11-14 04:08:24,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2024-11-14 04:08:24,037 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 1.0684931506849316) internal successors, (78), 73 states have internal predecessors, (78), 0 states have call successors, (0), 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 32 [2024-11-14 04:08:24,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:08:24,037 INFO L225 Difference]: With dead ends: 54 [2024-11-14 04:08:24,037 INFO L226 Difference]: Without dead ends: 34 [2024-11-14 04:08:24,038 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2471 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=436, Invalid=9266, Unknown=0, NotChecked=0, Total=9702 [2024-11-14 04:08:24,038 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 21 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 1859 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 1909 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 1859 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2024-11-14 04:08:24,038 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 141 Invalid, 1909 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 1859 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2024-11-14 04:08:24,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2024-11-14 04:08:24,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2024-11-14 04:08:24,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 33 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) [2024-11-14 04:08:24,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2024-11-14 04:08:24,058 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 32 [2024-11-14 04:08:24,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:08:24,058 INFO L471 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2024-11-14 04:08:24,058 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 1.0684931506849316) internal successors, (78), 73 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:08:24,058 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2024-11-14 04:08:24,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2024-11-14 04:08:24,058 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:08:24,059 INFO L215 NwaCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:08:24,073 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2024-11-14 04:08:24,259 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2024-11-14 04:08:24,259 INFO L396 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:08:24,259 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:08:24,259 INFO L85 PathProgramCache]: Analyzing trace with hash -1434055057, now seen corresponding path program 19 times [2024-11-14 04:08:24,259 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:08:24,259 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1750704762] [2024-11-14 04:08:24,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:08:24,260 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:08:24,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:08:25,112 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 55 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:08:25,112 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:08:25,112 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1750704762] [2024-11-14 04:08:25,113 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1750704762] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:08:25,113 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [618842734] [2024-11-14 04:08:25,113 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 04:08:25,113 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:08:25,113 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:08:25,114 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:08:25,115 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2024-11-14 04:08:25,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:08:25,162 INFO L255 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 29 conjuncts are in the unsatisfiable core [2024-11-14 04:08:25,163 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:08:25,999 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:08:25,999 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:08:26,776 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:08:26,776 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [618842734] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:08:26,776 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1862654197] [2024-11-14 04:08:26,777 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:08:26,777 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:08:26,777 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:08:26,777 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:08:26,777 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:08:26,877 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:08:27,634 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6335#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0) (exists ((|v_ULTIMATE.start_student_version_~i~1#1_398| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_119| Int) (|v_ULTIMATE.start_student_version_~w#1_98| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_67| Int)) (and (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_67| 2147483647) (<= |v_ULTIMATE.start_student_version_~w#1_98| |v_ULTIMATE.start_student_version_~i~1#1_398|) (or (and (= |v_ULTIMATE.start_student_version_~i~1#1_398| |v_ULTIMATE.start_student_version_~w#1_98|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_119| 1)) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_119| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_398| |v_ULTIMATE.start_student_version_~w#1_98|)))) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_119| |v_ULTIMATE.start_main_~is_divisible1~0#1_67|)) (<= 4 |v_ULTIMATE.start_student_version_~w#1_98|) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_67| 2147483648)))))' at error location [2024-11-14 04:08:27,634 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:08:27,634 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:08:27,634 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 69 [2024-11-14 04:08:27,635 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579141684] [2024-11-14 04:08:27,635 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:08:27,635 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2024-11-14 04:08:27,635 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:08:27,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2024-11-14 04:08:27,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=929, Invalid=5077, Unknown=0, NotChecked=0, Total=6006 [2024-11-14 04:08:27,636 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand has 69 states, 69 states have (on average 1.1159420289855073) internal successors, (77), 69 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) [2024-11-14 04:08:27,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:08:27,858 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2024-11-14 04:08:27,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2024-11-14 04:08:27,859 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 1.1159420289855073) internal successors, (77), 69 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 33 [2024-11-14 04:08:27,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:08:27,859 INFO L225 Difference]: With dead ends: 39 [2024-11-14 04:08:27,859 INFO L226 Difference]: Without dead ends: 35 [2024-11-14 04:08:27,860 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 39 SyntacticMatches, 12 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4026 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=971, Invalid=5191, Unknown=0, NotChecked=0, Total=6162 [2024-11-14 04:08:27,860 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 276 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 276 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 04:08:27,860 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 35 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 276 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 04:08:27,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2024-11-14 04:08:27,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2024-11-14 04:08:27,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:08:27,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2024-11-14 04:08:27,878 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 33 [2024-11-14 04:08:27,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:08:27,878 INFO L471 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2024-11-14 04:08:27,878 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 1.1159420289855073) internal successors, (77), 69 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) [2024-11-14 04:08:27,878 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2024-11-14 04:08:27,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2024-11-14 04:08:27,879 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:08:27,879 INFO L215 NwaCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:08:27,899 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2024-11-14 04:08:28,079 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2024-11-14 04:08:28,079 INFO L396 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:08:28,079 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:08:28,080 INFO L85 PathProgramCache]: Analyzing trace with hash -1547334702, now seen corresponding path program 20 times [2024-11-14 04:08:28,080 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:08:28,080 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1912853917] [2024-11-14 04:08:28,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:08:28,080 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:08:28,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:08:29,625 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:08:29,625 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:08:29,625 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1912853917] [2024-11-14 04:08:29,625 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1912853917] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:08:29,625 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2101471896] [2024-11-14 04:08:29,625 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 04:08:29,625 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:08:29,625 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:08:29,629 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:08:29,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2024-11-14 04:08:29,704 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2024-11-14 04:08:29,704 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:08:29,707 WARN L253 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 75 conjuncts are in the unsatisfiable core [2024-11-14 04:08:29,709 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:08:33,371 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:08:33,372 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:08:36,998 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:08:36,998 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2101471896] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:08:36,998 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1511344013] [2024-11-14 04:08:36,999 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:08:36,999 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:08:37,000 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:08:37,000 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:08:37,000 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:08:37,142 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:08:39,027 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6764#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (exists ((|v_ULTIMATE.start_student_version_~is_divisible~1#1_125| Int) (|v_ULTIMATE.start_student_version_~w#1_102| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_70| Int) (|v_ULTIMATE.start_student_version_~i~1#1_429| Int)) (and (<= 4 |v_ULTIMATE.start_student_version_~w#1_102|) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_125| |v_ULTIMATE.start_main_~is_divisible1~0#1_70|)) (<= |v_ULTIMATE.start_student_version_~w#1_102| |v_ULTIMATE.start_student_version_~i~1#1_429|) (or (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_429| |v_ULTIMATE.start_student_version_~w#1_102|)) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_125| 0)) (and (= |v_ULTIMATE.start_student_version_~i~1#1_429| |v_ULTIMATE.start_student_version_~w#1_102|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_125| 1))) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_70| 2147483647) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_70| 2147483648)))) (= ~false~0 0))' at error location [2024-11-14 04:08:39,028 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:08:39,028 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:08:39,028 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 94 [2024-11-14 04:08:39,028 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403622609] [2024-11-14 04:08:39,028 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:08:39,029 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2024-11-14 04:08:39,029 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:08:39,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2024-11-14 04:08:39,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=410, Invalid=10096, Unknown=0, NotChecked=0, Total=10506 [2024-11-14 04:08:39,030 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand has 94 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) [2024-11-14 04:08:44,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:08:44,246 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2024-11-14 04:08:44,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2024-11-14 04:08:44,247 INFO L78 Accepts]: Start accepts. Automaton has has 94 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) Word has length 34 [2024-11-14 04:08:44,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:08:44,247 INFO L225 Difference]: With dead ends: 60 [2024-11-14 04:08:44,247 INFO L226 Difference]: Without dead ends: 37 [2024-11-14 04:08:44,248 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5284 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=728, Invalid=17904, Unknown=0, NotChecked=0, Total=18632 [2024-11-14 04:08:44,249 INFO L432 NwaCegarLoop]: 2 mSDtfsCounter, 76 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 2051 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 2085 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 2051 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2024-11-14 04:08:44,249 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 114 Invalid, 2085 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 2051 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2024-11-14 04:08:44,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2024-11-14 04:08:44,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2024-11-14 04:08:44,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 36 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) [2024-11-14 04:08:44,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2024-11-14 04:08:44,281 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2024-11-14 04:08:44,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:08:44,281 INFO L471 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2024-11-14 04:08:44,281 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 94 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) [2024-11-14 04:08:44,281 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2024-11-14 04:08:44,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2024-11-14 04:08:44,282 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:08:44,282 INFO L215 NwaCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:08:44,302 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2024-11-14 04:08:44,482 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2024-11-14 04:08:44,482 INFO L396 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:08:44,483 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:08:44,483 INFO L85 PathProgramCache]: Analyzing trace with hash -1223294437, now seen corresponding path program 21 times [2024-11-14 04:08:44,483 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:08:44,483 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1334128224] [2024-11-14 04:08:44,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:08:44,483 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:08:44,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:08:46,036 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:08:46,036 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:08:46,037 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1334128224] [2024-11-14 04:08:46,037 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1334128224] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:08:46,037 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1794587520] [2024-11-14 04:08:46,037 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 04:08:46,037 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:08:46,037 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:08:46,039 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:08:46,040 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2024-11-14 04:08:46,090 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 04:08:46,090 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:08:46,092 WARN L253 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 78 conjuncts are in the unsatisfiable core [2024-11-14 04:08:46,093 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:08:50,205 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:08:50,205 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:08:53,804 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:08:53,804 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1794587520] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:08:53,805 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [566213367] [2024-11-14 04:08:53,805 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:08:53,806 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:08:53,806 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:08:53,806 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:08:53,806 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:08:53,891 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:08:55,508 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7318#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (exists ((|v_ULTIMATE.start_student_version_~i~1#1_462| Int) (|v_ULTIMATE.start_student_version_~w#1_106| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_131| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_73| Int)) (and (<= 4 |v_ULTIMATE.start_student_version_~w#1_106|) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_73| 2147483647) (or (and (= |v_ULTIMATE.start_student_version_~i~1#1_462| |v_ULTIMATE.start_student_version_~w#1_106|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_131| 1)) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_131| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_462| |v_ULTIMATE.start_student_version_~w#1_106|)))) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_73| 2147483648)) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_131| |v_ULTIMATE.start_main_~is_divisible1~0#1_73|)) (<= |v_ULTIMATE.start_student_version_~w#1_106| |v_ULTIMATE.start_student_version_~i~1#1_462|))) (= ~false~0 0))' at error location [2024-11-14 04:08:55,508 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:08:55,508 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:08:55,508 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 100 [2024-11-14 04:08:55,509 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278285567] [2024-11-14 04:08:55,509 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:08:55,509 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2024-11-14 04:08:55,509 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:08:55,509 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2024-11-14 04:08:55,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=417, Invalid=11355, Unknown=0, NotChecked=0, Total=11772 [2024-11-14 04:08:55,510 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand has 100 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) [2024-11-14 04:08:59,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:08:59,337 INFO L93 Difference]: Finished difference Result 61 states and 64 transitions. [2024-11-14 04:08:59,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2024-11-14 04:08:59,338 INFO L78 Accepts]: Start accepts. Automaton has has 100 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) Word has length 36 [2024-11-14 04:08:59,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:08:59,338 INFO L225 Difference]: With dead ends: 61 [2024-11-14 04:08:59,339 INFO L226 Difference]: Without dead ends: 38 [2024-11-14 04:08:59,339 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4555 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=586, Invalid=15670, Unknown=0, NotChecked=0, Total=16256 [2024-11-14 04:08:59,340 INFO L432 NwaCegarLoop]: 2 mSDtfsCounter, 31 mSDsluCounter, 145 mSDsCounter, 0 mSdLazyCounter, 2648 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 2650 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 2648 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2024-11-14 04:08:59,340 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 147 Invalid, 2650 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 2648 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2024-11-14 04:08:59,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2024-11-14 04:08:59,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2024-11-14 04:08:59,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.054054054054054) internal successors, (39), 37 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:08:59,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2024-11-14 04:08:59,361 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 36 [2024-11-14 04:08:59,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:08:59,361 INFO L471 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2024-11-14 04:08:59,361 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 100 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) [2024-11-14 04:08:59,361 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2024-11-14 04:08:59,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2024-11-14 04:08:59,362 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:08:59,362 INFO L215 NwaCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:08:59,378 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2024-11-14 04:08:59,564 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2024-11-14 04:08:59,564 INFO L396 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:08:59,564 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:08:59,564 INFO L85 PathProgramCache]: Analyzing trace with hash 1719575631, now seen corresponding path program 22 times [2024-11-14 04:08:59,564 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:08:59,564 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1131857934] [2024-11-14 04:08:59,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:08:59,565 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:08:59,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:09:00,707 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 78 proven. 118 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:09:00,707 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:09:00,707 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1131857934] [2024-11-14 04:09:00,708 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1131857934] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:09:00,708 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1556057987] [2024-11-14 04:09:00,708 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 04:09:00,708 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:09:00,708 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:09:00,709 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:09:00,710 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2024-11-14 04:09:00,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:09:00,764 INFO L255 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 33 conjuncts are in the unsatisfiable core [2024-11-14 04:09:00,765 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:09:01,847 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:09:01,847 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:09:02,866 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:09:02,867 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1556057987] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:09:02,867 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1080929931] [2024-11-14 04:09:02,868 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:09:02,868 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:09:02,868 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:09:02,868 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:09:02,868 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:09:02,967 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:09:03,788 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7832#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_student_version_~i~1#1_496| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_75| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_135| Int) (|v_ULTIMATE.start_student_version_~w#1_110| Int)) (and (<= 4 |v_ULTIMATE.start_student_version_~w#1_110|) (or (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_135| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_496| |v_ULTIMATE.start_student_version_~w#1_110|)) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_135| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_496| |v_ULTIMATE.start_student_version_~w#1_110|)))) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_75| 2147483648)) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_135| |v_ULTIMATE.start_main_~is_divisible1~0#1_75|)) (<= |v_ULTIMATE.start_student_version_~w#1_110| |v_ULTIMATE.start_student_version_~i~1#1_496|) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_75| 2147483647))) (= ~true~0 1) (= ~false~0 0))' at error location [2024-11-14 04:09:03,788 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:09:03,788 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:09:03,789 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33, 33] total 79 [2024-11-14 04:09:03,789 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [138634554] [2024-11-14 04:09:03,789 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:09:03,789 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2024-11-14 04:09:03,789 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:09:03,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2024-11-14 04:09:03,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1200, Invalid=6456, Unknown=0, NotChecked=0, Total=7656 [2024-11-14 04:09:03,791 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand has 79 states, 79 states have (on average 1.1012658227848102) internal successors, (87), 79 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) [2024-11-14 04:09:04,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:09:04,030 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2024-11-14 04:09:04,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2024-11-14 04:09:04,031 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 1.1012658227848102) internal successors, (87), 79 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 37 [2024-11-14 04:09:04,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:09:04,031 INFO L225 Difference]: With dead ends: 43 [2024-11-14 04:09:04,031 INFO L226 Difference]: Without dead ends: 39 [2024-11-14 04:09:04,032 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 43 SyntacticMatches, 14 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5231 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=1248, Invalid=6584, Unknown=0, NotChecked=0, Total=7832 [2024-11-14 04:09:04,032 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 296 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 04:09:04,032 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 35 Invalid, 296 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 296 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 04:09:04,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2024-11-14 04:09:04,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2024-11-14 04:09:04,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:09:04,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2024-11-14 04:09:04,054 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 37 [2024-11-14 04:09:04,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:09:04,054 INFO L471 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2024-11-14 04:09:04,054 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 1.1012658227848102) internal successors, (87), 79 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) [2024-11-14 04:09:04,054 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2024-11-14 04:09:04,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2024-11-14 04:09:04,054 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:09:04,054 INFO L215 NwaCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:09:04,076 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2024-11-14 04:09:04,255 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2024-11-14 04:09:04,255 INFO L396 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:09:04,255 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:09:04,255 INFO L85 PathProgramCache]: Analyzing trace with hash 1725936114, now seen corresponding path program 23 times [2024-11-14 04:09:04,255 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:09:04,255 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [435263110] [2024-11-14 04:09:04,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:09:04,256 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:09:04,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:09:06,002 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:09:06,002 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:09:06,002 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [435263110] [2024-11-14 04:09:06,002 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [435263110] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:09:06,002 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1417573384] [2024-11-14 04:09:06,002 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 04:09:06,002 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:09:06,003 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:09:06,004 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:09:06,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2024-11-14 04:09:06,061 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2024-11-14 04:09:06,061 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:09:06,062 WARN L253 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 80 conjuncts are in the unsatisfiable core [2024-11-14 04:09:06,064 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:09:10,007 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:09:10,007 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:09:14,287 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:09:14,287 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1417573384] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:09:14,287 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2122426991] [2024-11-14 04:09:14,288 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:09:14,288 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:09:14,288 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:09:14,288 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:09:14,288 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:09:14,380 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:09:16,010 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8312#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_main_~is_divisible1~0#1_78| Int) (|v_ULTIMATE.start_student_version_~i~1#1_532| Int) (|v_ULTIMATE.start_student_version_~w#1_114| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_141| Int)) (and (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_78| 2147483647) (<= 4 |v_ULTIMATE.start_student_version_~w#1_114|) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_78| 2147483648)) (or (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_532| |v_ULTIMATE.start_student_version_~w#1_114|)) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_141| 0)) (and (= |v_ULTIMATE.start_student_version_~i~1#1_532| |v_ULTIMATE.start_student_version_~w#1_114|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_141| 1))) (<= |v_ULTIMATE.start_student_version_~w#1_114| |v_ULTIMATE.start_student_version_~i~1#1_532|) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_141| |v_ULTIMATE.start_main_~is_divisible1~0#1_78|)))) (= ~true~0 1) (= ~false~0 0))' at error location [2024-11-14 04:09:16,011 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:09:16,011 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:09:16,011 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 105 [2024-11-14 04:09:16,011 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103019741] [2024-11-14 04:09:16,011 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:09:16,011 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 105 states [2024-11-14 04:09:16,011 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:09:16,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2024-11-14 04:09:16,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=489, Invalid=12393, Unknown=0, NotChecked=0, Total=12882 [2024-11-14 04:09:16,013 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 105 states, 105 states have (on average 1.0380952380952382) internal successors, (109), 105 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) [2024-11-14 04:09:25,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:09:25,862 INFO L93 Difference]: Finished difference Result 97 states and 117 transitions. [2024-11-14 04:09:25,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2024-11-14 04:09:25,863 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 105 states have (on average 1.0380952380952382) internal successors, (109), 105 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) Word has length 38 [2024-11-14 04:09:25,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:09:25,863 INFO L225 Difference]: With dead ends: 97 [2024-11-14 04:09:25,863 INFO L226 Difference]: Without dead ends: 73 [2024-11-14 04:09:25,864 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8446 ImplicationChecksByTransitivity, 17.5s TimeCoverageRelationStatistics Valid=1219, Invalid=27173, Unknown=0, NotChecked=0, Total=28392 [2024-11-14 04:09:25,865 INFO L432 NwaCegarLoop]: 2 mSDtfsCounter, 164 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 2230 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 164 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 2255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 2230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2024-11-14 04:09:25,865 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [164 Valid, 109 Invalid, 2255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 2230 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2024-11-14 04:09:25,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2024-11-14 04:09:25,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 58. [2024-11-14 04:09:25,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.2982456140350878) internal successors, (74), 57 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) [2024-11-14 04:09:25,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 74 transitions. [2024-11-14 04:09:25,922 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 74 transitions. Word has length 38 [2024-11-14 04:09:25,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:09:25,922 INFO L471 AbstractCegarLoop]: Abstraction has 58 states and 74 transitions. [2024-11-14 04:09:25,923 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 105 states, 105 states have (on average 1.0380952380952382) internal successors, (109), 105 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) [2024-11-14 04:09:25,923 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 74 transitions. [2024-11-14 04:09:25,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2024-11-14 04:09:25,923 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:09:25,923 INFO L215 NwaCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:09:25,937 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2024-11-14 04:09:26,123 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2024-11-14 04:09:26,124 INFO L396 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:09:26,124 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:09:26,124 INFO L85 PathProgramCache]: Analyzing trace with hash -202106373, now seen corresponding path program 24 times [2024-11-14 04:09:26,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:09:26,124 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1599044317] [2024-11-14 04:09:26,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:09:26,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:09:26,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:09:27,862 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:09:27,862 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:09:27,862 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1599044317] [2024-11-14 04:09:27,862 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1599044317] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:09:27,862 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [543649766] [2024-11-14 04:09:27,862 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 04:09:27,863 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:09:27,863 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:09:27,864 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:09:27,865 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2024-11-14 04:09:27,918 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 04:09:27,918 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:09:27,920 WARN L253 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 84 conjuncts are in the unsatisfiable core [2024-11-14 04:09:27,921 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:09:30,251 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:09:30,251 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:09:34,254 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:09:34,254 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [543649766] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:09:34,255 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1538869596] [2024-11-14 04:09:34,256 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:09:34,256 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:09:34,256 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:09:34,256 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:09:34,256 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:09:34,370 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:09:35,855 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9039#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0) (exists ((|v_ULTIMATE.start_student_version_~w#1_118| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_147| Int) (|v_ULTIMATE.start_student_version_~i~1#1_569| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_81| Int)) (and (or (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_147| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_569| |v_ULTIMATE.start_student_version_~w#1_118|))) (and (= |v_ULTIMATE.start_student_version_~i~1#1_569| |v_ULTIMATE.start_student_version_~w#1_118|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_147| 1))) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_147| |v_ULTIMATE.start_main_~is_divisible1~0#1_81|)) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_81| 2147483648)) (<= |v_ULTIMATE.start_student_version_~w#1_118| |v_ULTIMATE.start_student_version_~i~1#1_569|) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_81| 2147483647) (<= 4 |v_ULTIMATE.start_student_version_~w#1_118|))))' at error location [2024-11-14 04:09:35,855 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:09:35,856 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:09:35,856 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 94 [2024-11-14 04:09:35,856 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264632969] [2024-11-14 04:09:35,856 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:09:35,856 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2024-11-14 04:09:35,856 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:09:35,857 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2024-11-14 04:09:35,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=376, Invalid=10130, Unknown=0, NotChecked=0, Total=10506 [2024-11-14 04:09:35,857 INFO L87 Difference]: Start difference. First operand 58 states and 74 transitions. Second operand has 94 states, 94 states have (on average 1.0425531914893618) internal successors, (98), 94 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) [2024-11-14 04:09:45,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:09:45,102 INFO L93 Difference]: Finished difference Result 118 states and 140 transitions. [2024-11-14 04:09:45,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2024-11-14 04:09:45,103 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 1.0425531914893618) internal successors, (98), 94 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 40 [2024-11-14 04:09:45,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:09:45,104 INFO L225 Difference]: With dead ends: 118 [2024-11-14 04:09:45,104 INFO L226 Difference]: Without dead ends: 93 [2024-11-14 04:09:45,104 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5474 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=879, Invalid=18861, Unknown=0, NotChecked=0, Total=19740 [2024-11-14 04:09:45,105 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 71 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 2242 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 2268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 2242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2024-11-14 04:09:45,105 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [71 Valid, 128 Invalid, 2268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 2242 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2024-11-14 04:09:45,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2024-11-14 04:09:45,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 78. [2024-11-14 04:09:45,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 77 states have (on average 1.2467532467532467) internal successors, (96), 77 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:09:45,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 96 transitions. [2024-11-14 04:09:45,195 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 96 transitions. Word has length 40 [2024-11-14 04:09:45,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:09:45,195 INFO L471 AbstractCegarLoop]: Abstraction has 78 states and 96 transitions. [2024-11-14 04:09:45,195 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 1.0425531914893618) internal successors, (98), 94 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) [2024-11-14 04:09:45,195 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 96 transitions. [2024-11-14 04:09:45,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2024-11-14 04:09:45,195 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:09:45,195 INFO L215 NwaCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:09:45,213 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2024-11-14 04:09:45,396 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:09:45,396 INFO L396 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:09:45,396 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:09:45,396 INFO L85 PathProgramCache]: Analyzing trace with hash 58822674, now seen corresponding path program 25 times [2024-11-14 04:09:45,396 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:09:45,396 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1996978498] [2024-11-14 04:09:45,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:09:45,397 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:09:45,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:09:47,224 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:09:47,224 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:09:47,224 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1996978498] [2024-11-14 04:09:47,224 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1996978498] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:09:47,225 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1017746635] [2024-11-14 04:09:47,225 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 04:09:47,225 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:09:47,225 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:09:47,227 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:09:47,229 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2024-11-14 04:09:47,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:09:47,283 WARN L253 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 84 conjuncts are in the unsatisfiable core [2024-11-14 04:09:47,285 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:09:49,882 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:09:49,882 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:09:53,725 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:09:53,725 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1017746635] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:09:53,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [465494448] [2024-11-14 04:09:53,726 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:09:53,726 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:09:53,726 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:09:53,726 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:09:53,726 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:09:53,838 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:09:55,363 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9826#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_student_version_~i~1#1_609| Int) (|v_ULTIMATE.start_student_version_~w#1_122| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_153| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_84| Int)) (and (or (and (= |v_ULTIMATE.start_student_version_~i~1#1_609| |v_ULTIMATE.start_student_version_~w#1_122|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_153| 1)) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_153| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_609| |v_ULTIMATE.start_student_version_~w#1_122|)))) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_84| 2147483648)) (<= 4 |v_ULTIMATE.start_student_version_~w#1_122|) (<= |v_ULTIMATE.start_student_version_~w#1_122| |v_ULTIMATE.start_student_version_~i~1#1_609|) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_84| 2147483647) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_153| |v_ULTIMATE.start_main_~is_divisible1~0#1_84|)))) (= ~true~0 1) (= ~false~0 0))' at error location [2024-11-14 04:09:55,363 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:09:55,363 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:09:55,363 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 98 [2024-11-14 04:09:55,364 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136691195] [2024-11-14 04:09:55,364 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:09:55,364 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2024-11-14 04:09:55,364 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:09:55,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2024-11-14 04:09:55,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=335, Invalid=11007, Unknown=0, NotChecked=0, Total=11342 [2024-11-14 04:09:55,365 INFO L87 Difference]: Start difference. First operand 78 states and 96 transitions. Second operand has 98 states, 98 states have (on average 1.0510204081632653) internal successors, (103), 98 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) [2024-11-14 04:10:00,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:10:00,177 INFO L93 Difference]: Finished difference Result 103 states and 122 transitions. [2024-11-14 04:10:00,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2024-11-14 04:10:00,178 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 1.0510204081632653) internal successors, (103), 98 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) Word has length 42 [2024-11-14 04:10:00,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:10:00,178 INFO L225 Difference]: With dead ends: 103 [2024-11-14 04:10:00,178 INFO L226 Difference]: Without dead ends: 78 [2024-11-14 04:10:00,179 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 58 SyntacticMatches, 2 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4287 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=581, Invalid=15931, Unknown=0, NotChecked=0, Total=16512 [2024-11-14 04:10:00,179 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 30 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 3067 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 3137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 3067 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2024-11-14 04:10:00,180 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 171 Invalid, 3137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 3067 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2024-11-14 04:10:00,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2024-11-14 04:10:00,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2024-11-14 04:10:00,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 77 states have (on average 1.2337662337662338) internal successors, (95), 77 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) [2024-11-14 04:10:00,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 95 transitions. [2024-11-14 04:10:00,245 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 95 transitions. Word has length 42 [2024-11-14 04:10:00,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:10:00,245 INFO L471 AbstractCegarLoop]: Abstraction has 78 states and 95 transitions. [2024-11-14 04:10:00,245 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 98 states have (on average 1.0510204081632653) internal successors, (103), 98 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) [2024-11-14 04:10:00,245 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 95 transitions. [2024-11-14 04:10:00,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2024-11-14 04:10:00,246 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:10:00,246 INFO L215 NwaCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:10:00,259 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2024-11-14 04:10:00,446 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:10:00,446 INFO L396 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:10:00,446 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:10:00,446 INFO L85 PathProgramCache]: Analyzing trace with hash -181617850, now seen corresponding path program 26 times [2024-11-14 04:10:00,447 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:10:00,447 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [800620741] [2024-11-14 04:10:00,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:10:00,447 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:10:00,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:10:01,717 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 120 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:10:01,717 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:10:01,717 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [800620741] [2024-11-14 04:10:01,717 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [800620741] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:10:01,717 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1218096633] [2024-11-14 04:10:01,717 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 04:10:01,717 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:10:01,717 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:10:01,719 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:10:01,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2024-11-14 04:10:01,788 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2024-11-14 04:10:01,788 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:10:01,791 INFO L255 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 39 conjuncts are in the unsatisfiable core [2024-11-14 04:10:01,793 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:10:03,336 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 136 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:10:03,336 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:10:04,663 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 153 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:10:04,663 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1218096633] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:10:04,663 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2133280772] [2024-11-14 04:10:04,664 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:10:04,664 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:10:04,664 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:10:04,664 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:10:04,664 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:10:04,763 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:10:05,664 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10554#(and (exists ((|v_ULTIMATE.start_student_version_~w#1_126| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_86| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_157| Int) (|v_ULTIMATE.start_student_version_~i~1#1_649| Int)) (and (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_86| 2147483647) (or (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_157| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_649| |v_ULTIMATE.start_student_version_~w#1_126|))) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_157| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_649| |v_ULTIMATE.start_student_version_~w#1_126|))) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_86| 2147483648)) (<= 4 |v_ULTIMATE.start_student_version_~w#1_126|) (<= |v_ULTIMATE.start_student_version_~w#1_126| |v_ULTIMATE.start_student_version_~i~1#1_649|) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_157| |v_ULTIMATE.start_main_~is_divisible1~0#1_86|)))) (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0))' at error location [2024-11-14 04:10:05,665 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:10:05,665 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:10:05,665 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39, 39] total 94 [2024-11-14 04:10:05,665 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725190878] [2024-11-14 04:10:05,665 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:10:05,665 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2024-11-14 04:10:05,665 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:10:05,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2024-11-14 04:10:05,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1674, Invalid=8832, Unknown=0, NotChecked=0, Total=10506 [2024-11-14 04:10:05,667 INFO L87 Difference]: Start difference. First operand 78 states and 95 transitions. Second operand has 94 states, 94 states have (on average 1.0851063829787233) internal successors, (102), 94 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:10:06,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:10:06,051 INFO L93 Difference]: Finished difference Result 99 states and 118 transitions. [2024-11-14 04:10:06,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2024-11-14 04:10:06,052 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 1.0851063829787233) internal successors, (102), 94 states have internal predecessors, (102), 0 states have call successors, (0), 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 [2024-11-14 04:10:06,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:10:06,052 INFO L225 Difference]: With dead ends: 99 [2024-11-14 04:10:06,052 INFO L226 Difference]: Without dead ends: 95 [2024-11-14 04:10:06,053 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 49 SyntacticMatches, 17 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7331 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=1731, Invalid=8981, Unknown=0, NotChecked=0, Total=10712 [2024-11-14 04:10:06,053 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 355 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 355 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 355 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 04:10:06,054 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 36 Invalid, 355 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 355 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 04:10:06,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2024-11-14 04:10:06,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 45. [2024-11-14 04:10:06,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.0454545454545454) internal successors, (46), 44 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:10:06,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2024-11-14 04:10:06,109 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 43 [2024-11-14 04:10:06,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:10:06,109 INFO L471 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2024-11-14 04:10:06,110 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 1.0851063829787233) internal successors, (102), 94 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:10:06,110 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2024-11-14 04:10:06,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2024-11-14 04:10:06,110 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:10:06,110 INFO L215 NwaCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:10:06,124 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2024-11-14 04:10:06,312 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2024-11-14 04:10:06,312 INFO L396 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:10:06,312 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:10:06,312 INFO L85 PathProgramCache]: Analyzing trace with hash -1376486949, now seen corresponding path program 27 times [2024-11-14 04:10:06,312 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:10:06,312 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1906037786] [2024-11-14 04:10:06,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:10:06,312 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:10:06,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:10:08,481 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:10:08,481 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:10:08,482 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1906037786] [2024-11-14 04:10:08,482 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1906037786] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:10:08,482 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [581003986] [2024-11-14 04:10:08,482 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 04:10:08,482 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:10:08,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:10:08,483 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:10:08,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2024-11-14 04:10:08,539 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 04:10:08,539 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:10:08,541 WARN L253 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 90 conjuncts are in the unsatisfiable core [2024-11-14 04:10:08,542 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:10:11,257 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:10:11,257 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:10:15,249 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:10:15,249 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [581003986] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:10:15,249 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2002085256] [2024-11-14 04:10:15,250 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:10:15,250 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:10:15,250 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:10:15,250 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:10:15,251 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:10:15,353 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:10:16,940 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11188#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0) (exists ((|v_ULTIMATE.start_main_~is_divisible1~0#1_89| Int) (|v_ULTIMATE.start_student_version_~i~1#1_690| Int) (|v_ULTIMATE.start_student_version_~w#1_130| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_163| Int)) (and (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_89| 2147483648)) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_89| 2147483647) (or (and (= |v_ULTIMATE.start_student_version_~i~1#1_690| |v_ULTIMATE.start_student_version_~w#1_130|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_163| 1)) (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_690| |v_ULTIMATE.start_student_version_~w#1_130|)) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_163| 0))) (<= 4 |v_ULTIMATE.start_student_version_~w#1_130|) (<= |v_ULTIMATE.start_student_version_~w#1_130| |v_ULTIMATE.start_student_version_~i~1#1_690|) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_163| |v_ULTIMATE.start_main_~is_divisible1~0#1_89|)))))' at error location [2024-11-14 04:10:16,940 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:10:16,940 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:10:16,940 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 103 [2024-11-14 04:10:16,940 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956056575] [2024-11-14 04:10:16,940 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:10:16,941 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2024-11-14 04:10:16,941 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:10:16,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2024-11-14 04:10:16,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=12081, Unknown=0, NotChecked=0, Total=12432 [2024-11-14 04:10:16,942 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand has 103 states, 103 states have (on average 1.0485436893203883) internal successors, (108), 103 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:10:22,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:10:22,222 INFO L93 Difference]: Finished difference Result 72 states and 75 transitions. [2024-11-14 04:10:22,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2024-11-14 04:10:22,222 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 1.0485436893203883) internal successors, (108), 103 states have internal predecessors, (108), 0 states have call successors, (0), 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 44 [2024-11-14 04:10:22,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:10:22,223 INFO L225 Difference]: With dead ends: 72 [2024-11-14 04:10:22,223 INFO L226 Difference]: Without dead ends: 46 [2024-11-14 04:10:22,224 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4664 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=610, Invalid=17480, Unknown=0, NotChecked=0, Total=18090 [2024-11-14 04:10:22,224 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 27 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 3555 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 188 SdHoareTripleChecker+Invalid, 3629 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 3555 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2024-11-14 04:10:22,224 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 188 Invalid, 3629 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 3555 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2024-11-14 04:10:22,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2024-11-14 04:10:22,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2024-11-14 04:10:22,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.0444444444444445) internal successors, (47), 45 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) [2024-11-14 04:10:22,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2024-11-14 04:10:22,269 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 44 [2024-11-14 04:10:22,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:10:22,269 INFO L471 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2024-11-14 04:10:22,270 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 1.0485436893203883) internal successors, (108), 103 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:10:22,270 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2024-11-14 04:10:22,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2024-11-14 04:10:22,270 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:10:22,270 INFO L215 NwaCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:10:22,283 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2024-11-14 04:10:22,470 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2024-11-14 04:10:22,471 INFO L396 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:10:22,471 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:10:22,471 INFO L85 PathProgramCache]: Analyzing trace with hash -511596529, now seen corresponding path program 28 times [2024-11-14 04:10:22,471 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:10:22,471 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [319786007] [2024-11-14 04:10:22,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:10:22,471 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:10:22,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:10:23,903 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 136 proven. 188 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:10:23,903 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:10:23,904 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [319786007] [2024-11-14 04:10:23,904 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [319786007] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:10:23,904 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1616456852] [2024-11-14 04:10:23,904 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 04:10:23,904 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:10:23,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:10:23,906 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:10:23,908 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2024-11-14 04:10:23,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:10:23,962 INFO L255 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 41 conjuncts are in the unsatisfiable core [2024-11-14 04:10:23,963 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:10:25,497 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 153 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:10:25,497 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:10:26,953 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 171 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:10:26,953 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1616456852] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:10:26,953 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1764396974] [2024-11-14 04:10:26,954 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:10:26,954 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:10:26,954 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:10:26,954 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:10:26,954 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:10:27,057 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:10:27,990 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11817#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (exists ((|v_ULTIMATE.start_main_~is_divisible1~0#1_91| Int) (|v_ULTIMATE.start_student_version_~i~1#1_731| Int) (|v_ULTIMATE.start_student_version_~w#1_134| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_167| Int)) (and (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_167| |v_ULTIMATE.start_main_~is_divisible1~0#1_91|)) (or (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_731| |v_ULTIMATE.start_student_version_~w#1_134|)) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_167| 0)) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_167| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_731| |v_ULTIMATE.start_student_version_~w#1_134|))) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_91| 2147483647) (<= |v_ULTIMATE.start_student_version_~w#1_134| |v_ULTIMATE.start_student_version_~i~1#1_731|) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_91| 2147483648)) (<= 4 |v_ULTIMATE.start_student_version_~w#1_134|))) (= ~false~0 0))' at error location [2024-11-14 04:10:27,990 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:10:27,990 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:10:27,990 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 99 [2024-11-14 04:10:27,990 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161754717] [2024-11-14 04:10:27,990 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:10:27,991 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 99 states [2024-11-14 04:10:27,991 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:10:27,992 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2024-11-14 04:10:27,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1850, Invalid=9706, Unknown=0, NotChecked=0, Total=11556 [2024-11-14 04:10:27,992 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand has 99 states, 99 states have (on average 1.0808080808080809) internal successors, (107), 99 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) [2024-11-14 04:10:28,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:10:28,303 INFO L93 Difference]: Finished difference Result 51 states and 52 transitions. [2024-11-14 04:10:28,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2024-11-14 04:10:28,303 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 99 states have (on average 1.0808080808080809) internal successors, (107), 99 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 45 [2024-11-14 04:10:28,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:10:28,304 INFO L225 Difference]: With dead ends: 51 [2024-11-14 04:10:28,304 INFO L226 Difference]: Without dead ends: 47 [2024-11-14 04:10:28,305 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 51 SyntacticMatches, 18 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8109 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=1910, Invalid=9862, Unknown=0, NotChecked=0, Total=11772 [2024-11-14 04:10:28,305 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 329 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 329 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 329 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 04:10:28,305 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 27 Invalid, 329 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 329 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 04:10:28,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2024-11-14 04:10:28,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2024-11-14 04:10:28,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:10:28,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2024-11-14 04:10:28,353 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 45 [2024-11-14 04:10:28,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:10:28,353 INFO L471 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2024-11-14 04:10:28,353 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 99 states, 99 states have (on average 1.0808080808080809) internal successors, (107), 99 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) [2024-11-14 04:10:28,353 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2024-11-14 04:10:28,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2024-11-14 04:10:28,354 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:10:28,354 INFO L215 NwaCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:10:28,367 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2024-11-14 04:10:28,554 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2024-11-14 04:10:28,554 INFO L396 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:10:28,555 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:10:28,555 INFO L85 PathProgramCache]: Analyzing trace with hash 1279075890, now seen corresponding path program 29 times [2024-11-14 04:10:28,555 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:10:28,555 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [600568503] [2024-11-14 04:10:28,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:10:28,555 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:10:28,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:10:30,948 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:10:30,949 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:10:30,949 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [600568503] [2024-11-14 04:10:30,949 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [600568503] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:10:30,949 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [742131492] [2024-11-14 04:10:30,949 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 04:10:30,949 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:10:30,949 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:10:30,951 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:10:30,952 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2024-11-14 04:10:31,013 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2024-11-14 04:10:31,013 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:10:31,015 WARN L253 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 96 conjuncts are in the unsatisfiable core [2024-11-14 04:10:31,016 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:10:36,470 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:10:36,470 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:10:42,725 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:10:42,725 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [742131492] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:10:42,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [477850433] [2024-11-14 04:10:42,726 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:10:42,726 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:10:42,727 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:10:42,727 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:10:42,727 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:10:42,835 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:10:44,739 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12401#(and (exists ((|v_ULTIMATE.start_student_version_~i~1#1_775| Int) (|v_ULTIMATE.start_student_version_~w#1_138| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_173| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_94| Int)) (and (or (and (= |v_ULTIMATE.start_student_version_~i~1#1_775| |v_ULTIMATE.start_student_version_~w#1_138|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_173| 1)) (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_775| |v_ULTIMATE.start_student_version_~w#1_138|)) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_173| 0))) (<= |v_ULTIMATE.start_student_version_~w#1_138| |v_ULTIMATE.start_student_version_~i~1#1_775|) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_94| 2147483648)) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_94| 2147483647) (<= 4 |v_ULTIMATE.start_student_version_~w#1_138|) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_173| |v_ULTIMATE.start_main_~is_divisible1~0#1_94|)))) (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0))' at error location [2024-11-14 04:10:44,739 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:10:44,739 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:10:44,739 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 129 [2024-11-14 04:10:44,739 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089811829] [2024-11-14 04:10:44,739 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:10:44,740 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 129 states [2024-11-14 04:10:44,740 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:10:44,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 129 interpolants. [2024-11-14 04:10:44,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=18309, Unknown=0, NotChecked=0, Total=18906 [2024-11-14 04:10:44,741 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand has 129 states, 129 states have (on average 1.0310077519379846) internal successors, (133), 129 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) [2024-11-14 04:11:00,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:11:00,976 INFO L93 Difference]: Finished difference Result 117 states and 141 transitions. [2024-11-14 04:11:00,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2024-11-14 04:11:00,977 INFO L78 Accepts]: Start accepts. Automaton has has 129 states, 129 states have (on average 1.0310077519379846) internal successors, (133), 129 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) Word has length 46 [2024-11-14 04:11:00,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:11:00,977 INFO L225 Difference]: With dead ends: 117 [2024-11-14 04:11:00,977 INFO L226 Difference]: Without dead ends: 89 [2024-11-14 04:11:00,979 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 203 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12545 ImplicationChecksByTransitivity, 26.6s TimeCoverageRelationStatistics Valid=1575, Invalid=40245, Unknown=0, NotChecked=0, Total=41820 [2024-11-14 04:11:00,979 INFO L432 NwaCegarLoop]: 2 mSDtfsCounter, 158 mSDsluCounter, 143 mSDsCounter, 0 mSdLazyCounter, 3511 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 3540 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 3511 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2024-11-14 04:11:00,979 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [158 Valid, 145 Invalid, 3540 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 3511 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2024-11-14 04:11:00,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2024-11-14 04:11:01,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 70. [2024-11-14 04:11:01,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.3043478260869565) internal successors, (90), 69 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:11:01,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 90 transitions. [2024-11-14 04:11:01,115 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 90 transitions. Word has length 46 [2024-11-14 04:11:01,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:11:01,115 INFO L471 AbstractCegarLoop]: Abstraction has 70 states and 90 transitions. [2024-11-14 04:11:01,115 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 129 states, 129 states have (on average 1.0310077519379846) internal successors, (133), 129 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) [2024-11-14 04:11:01,115 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 90 transitions. [2024-11-14 04:11:01,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2024-11-14 04:11:01,116 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:11:01,116 INFO L215 NwaCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:11:01,136 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2024-11-14 04:11:01,316 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2024-11-14 04:11:01,317 INFO L396 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:11:01,317 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:11:01,317 INFO L85 PathProgramCache]: Analyzing trace with hash 1397039547, now seen corresponding path program 30 times [2024-11-14 04:11:01,317 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:11:01,317 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629829368] [2024-11-14 04:11:01,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:11:01,317 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:11:01,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:11:03,840 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:11:03,840 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:11:03,840 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1629829368] [2024-11-14 04:11:03,841 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1629829368] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:11:03,841 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1192910871] [2024-11-14 04:11:03,841 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 04:11:03,841 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:11:03,841 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:11:03,842 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:11:03,843 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2024-11-14 04:11:03,903 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 04:11:03,903 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:11:03,905 WARN L253 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 100 conjuncts are in the unsatisfiable core [2024-11-14 04:11:03,906 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:11:10,827 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:11:10,828 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:11:17,209 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:11:17,209 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1192910871] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:11:17,209 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [330658328] [2024-11-14 04:11:17,210 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:11:17,210 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:11:17,210 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:11:17,210 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:11:17,210 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:11:17,330 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:11:19,474 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13305#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_main_~is_divisible1~0#1_97| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_179| Int) (|v_ULTIMATE.start_student_version_~i~1#1_821| Int) (|v_ULTIMATE.start_student_version_~w#1_142| Int)) (and (<= 4 |v_ULTIMATE.start_student_version_~w#1_142|) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_97| 2147483647) (or (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_821| |v_ULTIMATE.start_student_version_~w#1_142|)) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_179| 0)) (and (= |v_ULTIMATE.start_student_version_~i~1#1_821| |v_ULTIMATE.start_student_version_~w#1_142|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_179| 1))) (<= |v_ULTIMATE.start_student_version_~w#1_142| |v_ULTIMATE.start_student_version_~i~1#1_821|) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_97| 2147483648)) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_179| |v_ULTIMATE.start_main_~is_divisible1~0#1_97|)))) (= ~true~0 1) (= ~false~0 0))' at error location [2024-11-14 04:11:19,475 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:11:19,475 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:11:19,475 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 135 [2024-11-14 04:11:19,475 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1858725736] [2024-11-14 04:11:19,475 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:11:19,475 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 135 states [2024-11-14 04:11:19,475 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:11:19,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 135 interpolants. [2024-11-14 04:11:19,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=579, Invalid=20013, Unknown=0, NotChecked=0, Total=20592 [2024-11-14 04:11:19,477 INFO L87 Difference]: Start difference. First operand 70 states and 90 transitions. Second operand has 135 states, 135 states have (on average 1.0296296296296297) internal successors, (139), 135 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) [2024-11-14 04:11:26,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:11:26,972 INFO L93 Difference]: Finished difference Result 98 states and 119 transitions. [2024-11-14 04:11:26,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2024-11-14 04:11:26,973 INFO L78 Accepts]: Start accepts. Automaton has has 135 states, 135 states have (on average 1.0296296296296297) internal successors, (139), 135 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) Word has length 48 [2024-11-14 04:11:26,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:11:26,973 INFO L225 Difference]: With dead ends: 98 [2024-11-14 04:11:26,973 INFO L226 Difference]: Without dead ends: 70 [2024-11-14 04:11:26,974 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8206 ImplicationChecksByTransitivity, 19.1s TimeCoverageRelationStatistics Valid=902, Invalid=28168, Unknown=0, NotChecked=0, Total=29070 [2024-11-14 04:11:26,974 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 41 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 4543 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 4625 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 4543 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2024-11-14 04:11:26,974 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 225 Invalid, 4625 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 4543 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2024-11-14 04:11:26,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2024-11-14 04:11:27,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2024-11-14 04:11:27,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.289855072463768) internal successors, (89), 69 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) [2024-11-14 04:11:27,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 89 transitions. [2024-11-14 04:11:27,081 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 89 transitions. Word has length 48 [2024-11-14 04:11:27,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:11:27,081 INFO L471 AbstractCegarLoop]: Abstraction has 70 states and 89 transitions. [2024-11-14 04:11:27,082 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 135 states, 135 states have (on average 1.0296296296296297) internal successors, (139), 135 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) [2024-11-14 04:11:27,082 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 89 transitions. [2024-11-14 04:11:27,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2024-11-14 04:11:27,082 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:11:27,082 INFO L215 NwaCegarLoop]: trace histogram [20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:11:27,097 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2024-11-14 04:11:27,282 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:11:27,282 INFO L396 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:11:27,283 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:11:27,283 INFO L85 PathProgramCache]: Analyzing trace with hash -2090330641, now seen corresponding path program 31 times [2024-11-14 04:11:27,283 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:11:27,283 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1570408182] [2024-11-14 04:11:27,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:11:27,283 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:11:27,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:11:29,221 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 171 proven. 229 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:11:29,221 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:11:29,222 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1570408182] [2024-11-14 04:11:29,222 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1570408182] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:11:29,222 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [382222053] [2024-11-14 04:11:29,222 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 04:11:29,222 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:11:29,222 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:11:29,224 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:11:29,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2024-11-14 04:11:29,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:11:29,294 INFO L255 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 45 conjuncts are in the unsatisfiable core [2024-11-14 04:11:29,296 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:11:31,564 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 190 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:11:31,564 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:11:33,521 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 210 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:11:33,521 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [382222053] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:11:33,521 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1132622320] [2024-11-14 04:11:33,522 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:11:33,522 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:11:33,522 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:11:33,523 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:11:33,523 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:11:33,628 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:11:34,619 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14072#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (exists ((|v_ULTIMATE.start_student_version_~w#1_146| Int) (|v_ULTIMATE.start_student_version_~i~1#1_866| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_99| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_183| Int)) (and (<= 4 |v_ULTIMATE.start_student_version_~w#1_146|) (<= |v_ULTIMATE.start_student_version_~w#1_146| |v_ULTIMATE.start_student_version_~i~1#1_866|) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_99| 2147483647) (or (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_183| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_866| |v_ULTIMATE.start_student_version_~w#1_146|)) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_183| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_866| |v_ULTIMATE.start_student_version_~w#1_146|)))) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_99| 2147483648)) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_183| |v_ULTIMATE.start_main_~is_divisible1~0#1_99|)))) (= ~false~0 0))' at error location [2024-11-14 04:11:34,619 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:11:34,619 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:11:34,620 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45, 45] total 109 [2024-11-14 04:11:34,620 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47511950] [2024-11-14 04:11:34,620 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:11:34,620 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2024-11-14 04:11:34,620 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:11:34,621 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2024-11-14 04:11:34,622 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2229, Invalid=11577, Unknown=0, NotChecked=0, Total=13806 [2024-11-14 04:11:34,622 INFO L87 Difference]: Start difference. First operand 70 states and 89 transitions. Second operand has 109 states, 109 states have (on average 1.073394495412844) internal successors, (117), 109 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) [2024-11-14 04:11:35,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:11:35,161 INFO L93 Difference]: Finished difference Result 94 states and 114 transitions. [2024-11-14 04:11:35,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2024-11-14 04:11:35,162 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 109 states have (on average 1.073394495412844) internal successors, (117), 109 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 49 [2024-11-14 04:11:35,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:11:35,162 INFO L225 Difference]: With dead ends: 94 [2024-11-14 04:11:35,163 INFO L226 Difference]: Without dead ends: 90 [2024-11-14 04:11:35,163 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 55 SyntacticMatches, 20 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9782 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=2295, Invalid=11747, Unknown=0, NotChecked=0, Total=14042 [2024-11-14 04:11:35,164 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 409 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 409 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 409 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-14 04:11:35,164 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 38 Invalid, 409 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 409 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-14 04:11:35,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2024-11-14 04:11:35,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 51. [2024-11-14 04:11:35,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.04) internal successors, (52), 50 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:11:35,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2024-11-14 04:11:35,222 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 49 [2024-11-14 04:11:35,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:11:35,222 INFO L471 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2024-11-14 04:11:35,222 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 109 states have (on average 1.073394495412844) internal successors, (117), 109 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) [2024-11-14 04:11:35,222 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2024-11-14 04:11:35,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2024-11-14 04:11:35,223 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:11:35,223 INFO L215 NwaCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:11:35,245 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2024-11-14 04:11:35,423 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2024-11-14 04:11:35,423 INFO L396 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:11:35,423 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:11:35,423 INFO L85 PathProgramCache]: Analyzing trace with hash -417041326, now seen corresponding path program 32 times [2024-11-14 04:11:35,424 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:11:35,424 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [10342479] [2024-11-14 04:11:35,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:11:35,424 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:11:35,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:11:38,330 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:11:38,330 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:11:38,330 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [10342479] [2024-11-14 04:11:38,330 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [10342479] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:11:38,330 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [891202778] [2024-11-14 04:11:38,330 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 04:11:38,330 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:11:38,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:11:38,332 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:11:38,333 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2024-11-14 04:11:38,402 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2024-11-14 04:11:38,403 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:11:38,405 WARN L253 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 106 conjuncts are in the unsatisfiable core [2024-11-14 04:11:38,406 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:11:45,668 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:11:45,668 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:11:52,576 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:11:52,577 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [891202778] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:11:52,577 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [329575587] [2024-11-14 04:11:52,578 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:11:52,578 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:11:52,578 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:11:52,578 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:11:52,578 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:11:52,693 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:11:54,754 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14785#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_main_~is_divisible1~0#1_102| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_189| Int) (|v_ULTIMATE.start_student_version_~i~1#1_914| Int) (|v_ULTIMATE.start_student_version_~w#1_150| Int)) (and (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_102| 2147483648)) (<= |v_ULTIMATE.start_student_version_~w#1_150| |v_ULTIMATE.start_student_version_~i~1#1_914|) (<= 4 |v_ULTIMATE.start_student_version_~w#1_150|) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_102| 2147483647) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_189| |v_ULTIMATE.start_main_~is_divisible1~0#1_102|)) (or (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_189| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_914| |v_ULTIMATE.start_student_version_~w#1_150|))) (and (= |v_ULTIMATE.start_student_version_~i~1#1_914| |v_ULTIMATE.start_student_version_~w#1_150|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_189| 1))))) (= ~true~0 1) (= ~false~0 0))' at error location [2024-11-14 04:11:54,754 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:11:54,754 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:11:54,754 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 142 [2024-11-14 04:11:54,754 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759673923] [2024-11-14 04:11:54,754 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:11:54,755 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 142 states [2024-11-14 04:11:54,755 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:11:54,756 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 142 interpolants. [2024-11-14 04:11:54,756 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=585, Invalid=22065, Unknown=0, NotChecked=0, Total=22650 [2024-11-14 04:11:54,756 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 142 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) [2024-11-14 04:12:01,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:12:01,233 INFO L93 Difference]: Finished difference Result 82 states and 85 transitions. [2024-11-14 04:12:01,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2024-11-14 04:12:01,233 INFO L78 Accepts]: Start accepts. Automaton has has 142 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) Word has length 50 [2024-11-14 04:12:01,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:12:01,234 INFO L225 Difference]: With dead ends: 82 [2024-11-14 04:12:01,234 INFO L226 Difference]: Without dead ends: 52 [2024-11-14 04:12:01,234 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8804 ImplicationChecksByTransitivity, 19.5s TimeCoverageRelationStatistics Valid=824, Invalid=30328, Unknown=0, NotChecked=0, Total=31152 [2024-11-14 04:12:01,235 INFO L432 NwaCegarLoop]: 2 mSDtfsCounter, 36 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 4574 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 4576 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 4574 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2024-11-14 04:12:01,235 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 168 Invalid, 4576 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 4574 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2024-11-14 04:12:01,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2024-11-14 04:12:01,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2024-11-14 04:12:01,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 51 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) [2024-11-14 04:12:01,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2024-11-14 04:12:01,300 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 50 [2024-11-14 04:12:01,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:12:01,300 INFO L471 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2024-11-14 04:12:01,300 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 142 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) [2024-11-14 04:12:01,300 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2024-11-14 04:12:01,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2024-11-14 04:12:01,300 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:12:01,300 INFO L215 NwaCegarLoop]: trace histogram [21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:12:01,320 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2024-11-14 04:12:01,501 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:12:01,501 INFO L396 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:12:01,501 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:12:01,501 INFO L85 PathProgramCache]: Analyzing trace with hash -1705301114, now seen corresponding path program 33 times [2024-11-14 04:12:01,501 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:12:01,501 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [82640281] [2024-11-14 04:12:01,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:12:01,501 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:12:01,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:12:03,260 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 190 proven. 251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:12:03,260 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:12:03,260 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [82640281] [2024-11-14 04:12:03,261 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [82640281] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:12:03,261 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1005358859] [2024-11-14 04:12:03,261 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 04:12:03,261 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:12:03,261 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:12:03,262 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:12:03,263 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2024-11-14 04:12:03,321 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 04:12:03,321 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:12:03,322 INFO L255 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 47 conjuncts are in the unsatisfiable core [2024-11-14 04:12:03,323 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:12:05,256 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 210 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:12:05,256 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:12:07,112 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 231 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:12:07,113 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1005358859] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:12:07,113 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1469401023] [2024-11-14 04:12:07,114 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:12:07,114 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:12:07,114 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:12:07,114 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:12:07,114 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:12:07,202 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:12:08,211 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15502#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_student_version_~is_divisible~1#1_193| Int) (|v_ULTIMATE.start_student_version_~i~1#1_961| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_104| Int) (|v_ULTIMATE.start_student_version_~w#1_154| Int)) (and (<= |v_ULTIMATE.start_student_version_~w#1_154| |v_ULTIMATE.start_student_version_~i~1#1_961|) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_193| |v_ULTIMATE.start_main_~is_divisible1~0#1_104|)) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_104| 2147483648)) (or (and (= |v_ULTIMATE.start_student_version_~i~1#1_961| |v_ULTIMATE.start_student_version_~w#1_154|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_193| 1)) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_193| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_961| |v_ULTIMATE.start_student_version_~w#1_154|)))) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_104| 2147483647) (<= 4 |v_ULTIMATE.start_student_version_~w#1_154|))) (= ~true~0 1) (= ~false~0 0))' at error location [2024-11-14 04:12:08,211 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:12:08,211 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:12:08,211 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47, 47] total 114 [2024-11-14 04:12:08,211 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621241983] [2024-11-14 04:12:08,211 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:12:08,211 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 114 states [2024-11-14 04:12:08,211 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:12:08,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2024-11-14 04:12:08,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2432, Invalid=12574, Unknown=0, NotChecked=0, Total=15006 [2024-11-14 04:12:08,213 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand has 114 states, 114 states have (on average 1.0701754385964912) internal successors, (122), 114 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) [2024-11-14 04:12:08,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:12:08,528 INFO L93 Difference]: Finished difference Result 57 states and 58 transitions. [2024-11-14 04:12:08,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2024-11-14 04:12:08,528 INFO L78 Accepts]: Start accepts. Automaton has has 114 states, 114 states have (on average 1.0701754385964912) internal successors, (122), 114 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 51 [2024-11-14 04:12:08,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:12:08,529 INFO L225 Difference]: With dead ends: 57 [2024-11-14 04:12:08,529 INFO L226 Difference]: Without dead ends: 53 [2024-11-14 04:12:08,530 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 57 SyntacticMatches, 21 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10677 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=2501, Invalid=12751, Unknown=0, NotChecked=0, Total=15252 [2024-11-14 04:12:08,530 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 04:12:08,530 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 22 Invalid, 316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 04:12:08,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2024-11-14 04:12:08,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2024-11-14 04:12:08,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.0384615384615385) internal successors, (54), 52 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:12:08,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2024-11-14 04:12:08,590 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 51 [2024-11-14 04:12:08,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:12:08,590 INFO L471 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2024-11-14 04:12:08,590 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 114 states, 114 states have (on average 1.0701754385964912) internal successors, (122), 114 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) [2024-11-14 04:12:08,590 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2024-11-14 04:12:08,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2024-11-14 04:12:08,590 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:12:08,590 INFO L215 NwaCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:12:08,611 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2024-11-14 04:12:08,791 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2024-11-14 04:12:08,791 INFO L396 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:12:08,791 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:12:08,791 INFO L85 PathProgramCache]: Analyzing trace with hash -1366027877, now seen corresponding path program 34 times [2024-11-14 04:12:08,791 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:12:08,791 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [394246604] [2024-11-14 04:12:08,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:12:08,791 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:12:08,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:12:11,432 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:12:11,432 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:12:11,432 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [394246604] [2024-11-14 04:12:11,432 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [394246604] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:12:11,432 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [51628886] [2024-11-14 04:12:11,432 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 04:12:11,432 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:12:11,432 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:12:11,434 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:12:11,435 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2024-11-14 04:12:11,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:12:11,494 WARN L253 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 104 conjuncts are in the unsatisfiable core [2024-11-14 04:12:11,495 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:12:15,051 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:12:15,051 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:12:20,578 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:12:20,578 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [51628886] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:12:20,578 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2072096132] [2024-11-14 04:12:20,579 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:12:20,579 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:12:20,579 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:12:20,579 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:12:20,579 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:12:20,666 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:12:22,485 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16140#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0) (exists ((|v_ULTIMATE.start_student_version_~i~1#1_1010| Int) (|v_ULTIMATE.start_student_version_~w#1_158| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_199| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_107| Int)) (and (<= |v_ULTIMATE.start_student_version_~w#1_158| |v_ULTIMATE.start_student_version_~i~1#1_1010|) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_199| |v_ULTIMATE.start_main_~is_divisible1~0#1_107|)) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_107| 2147483648)) (or (and (= |v_ULTIMATE.start_student_version_~i~1#1_1010| |v_ULTIMATE.start_student_version_~w#1_158|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_199| 1)) (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_1010| |v_ULTIMATE.start_student_version_~w#1_158|)) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_199| 0))) (<= 4 |v_ULTIMATE.start_student_version_~w#1_158|) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_107| 2147483647))))' at error location [2024-11-14 04:12:22,485 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:12:22,485 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:12:22,485 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 123 [2024-11-14 04:12:22,485 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [39299562] [2024-11-14 04:12:22,485 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:12:22,486 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2024-11-14 04:12:22,486 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:12:22,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2024-11-14 04:12:22,487 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=415, Invalid=16877, Unknown=0, NotChecked=0, Total=17292 [2024-11-14 04:12:22,487 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand has 123 states, 123 states have (on average 1.0406504065040652) internal successors, (128), 123 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) [2024-11-14 04:12:29,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:12:29,902 INFO L93 Difference]: Finished difference Result 84 states and 87 transitions. [2024-11-14 04:12:29,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2024-11-14 04:12:29,902 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 1.0406504065040652) internal successors, (128), 123 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 52 [2024-11-14 04:12:29,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:12:29,903 INFO L225 Difference]: With dead ends: 84 [2024-11-14 04:12:29,903 INFO L226 Difference]: Without dead ends: 54 [2024-11-14 04:12:29,904 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 73 SyntacticMatches, 2 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6552 ImplicationChecksByTransitivity, 15.5s TimeCoverageRelationStatistics Valid=726, Invalid=24396, Unknown=0, NotChecked=0, Total=25122 [2024-11-14 04:12:29,905 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 33 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 4756 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 4846 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 4756 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2024-11-14 04:12:29,905 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 222 Invalid, 4846 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 4756 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2024-11-14 04:12:29,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2024-11-14 04:12:29,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2024-11-14 04:12:29,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.0377358490566038) internal successors, (55), 53 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) [2024-11-14 04:12:29,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2024-11-14 04:12:29,973 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 52 [2024-11-14 04:12:29,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:12:29,973 INFO L471 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2024-11-14 04:12:29,973 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 1.0406504065040652) internal successors, (128), 123 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) [2024-11-14 04:12:29,973 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2024-11-14 04:12:29,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2024-11-14 04:12:29,974 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:12:29,974 INFO L215 NwaCegarLoop]: trace histogram [22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:12:29,988 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2024-11-14 04:12:30,174 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2024-11-14 04:12:30,174 INFO L396 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:12:30,175 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:12:30,175 INFO L85 PathProgramCache]: Analyzing trace with hash 1861864399, now seen corresponding path program 35 times [2024-11-14 04:12:30,175 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:12:30,175 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1452266079] [2024-11-14 04:12:30,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:12:30,175 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:12:30,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:12:32,133 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 210 proven. 274 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:12:32,133 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:12:32,133 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1452266079] [2024-11-14 04:12:32,133 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1452266079] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:12:32,133 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962155045] [2024-11-14 04:12:32,133 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 04:12:32,133 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:12:32,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:12:32,135 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:12:32,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2024-11-14 04:12:32,208 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2024-11-14 04:12:32,209 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:12:32,210 INFO L255 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 49 conjuncts are in the unsatisfiable core [2024-11-14 04:12:32,212 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:12:34,314 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 231 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:12:34,314 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:12:36,315 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 253 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:12:36,315 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1962155045] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:12:36,315 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1474634171] [2024-11-14 04:12:36,316 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:12:36,316 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:12:36,317 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:12:36,317 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:12:36,317 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:12:36,411 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:12:37,432 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16885#(and (exists ((|v_ULTIMATE.start_student_version_~is_divisible~1#1_203| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_109| Int) (|v_ULTIMATE.start_student_version_~i~1#1_1059| Int) (|v_ULTIMATE.start_student_version_~w#1_162| Int)) (and (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_203| |v_ULTIMATE.start_main_~is_divisible1~0#1_109|)) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_109| 2147483648)) (<= |v_ULTIMATE.start_student_version_~w#1_162| |v_ULTIMATE.start_student_version_~i~1#1_1059|) (or (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_1059| |v_ULTIMATE.start_student_version_~w#1_162|)) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_203| 0)) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_203| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_1059| |v_ULTIMATE.start_student_version_~w#1_162|))) (<= 4 |v_ULTIMATE.start_student_version_~w#1_162|) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_109| 2147483647))) (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0))' at error location [2024-11-14 04:12:37,432 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:12:37,432 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:12:37,432 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 49, 49] total 119 [2024-11-14 04:12:37,432 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872340839] [2024-11-14 04:12:37,432 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:12:37,433 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 119 states [2024-11-14 04:12:37,433 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:12:37,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2024-11-14 04:12:37,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2644, Invalid=13612, Unknown=0, NotChecked=0, Total=16256 [2024-11-14 04:12:37,435 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand has 119 states, 119 states have (on average 1.0672268907563025) internal successors, (127), 119 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) [2024-11-14 04:12:37,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:12:37,898 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2024-11-14 04:12:37,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2024-11-14 04:12:37,898 INFO L78 Accepts]: Start accepts. Automaton has has 119 states, 119 states have (on average 1.0672268907563025) internal successors, (127), 119 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 53 [2024-11-14 04:12:37,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:12:37,899 INFO L225 Difference]: With dead ends: 59 [2024-11-14 04:12:37,899 INFO L226 Difference]: Without dead ends: 55 [2024-11-14 04:12:37,899 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 59 SyntacticMatches, 22 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11611 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=2716, Invalid=13796, Unknown=0, NotChecked=0, Total=16512 [2024-11-14 04:12:37,900 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 482 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 482 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 482 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-14 04:12:37,900 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 43 Invalid, 482 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 482 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-14 04:12:37,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2024-11-14 04:12:37,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2024-11-14 04:12:37,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.037037037037037) internal successors, (56), 54 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) [2024-11-14 04:12:37,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2024-11-14 04:12:37,960 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 53 [2024-11-14 04:12:37,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:12:37,960 INFO L471 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2024-11-14 04:12:37,960 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 119 states, 119 states have (on average 1.0672268907563025) internal successors, (127), 119 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) [2024-11-14 04:12:37,960 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2024-11-14 04:12:37,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2024-11-14 04:12:37,961 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:12:37,961 INFO L215 NwaCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:12:37,973 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2024-11-14 04:12:38,161 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:12:38,161 INFO L396 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:12:38,162 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:12:38,162 INFO L85 PathProgramCache]: Analyzing trace with hash 1841920626, now seen corresponding path program 36 times [2024-11-14 04:12:38,162 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:12:38,162 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2000260986] [2024-11-14 04:12:38,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:12:38,162 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:12:38,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:12:41,035 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:12:41,035 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:12:41,036 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2000260986] [2024-11-14 04:12:41,036 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2000260986] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:12:41,036 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1017555932] [2024-11-14 04:12:41,036 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 04:12:41,036 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:12:41,036 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:12:41,037 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:12:41,038 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2024-11-14 04:12:41,099 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 04:12:41,099 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:12:41,101 WARN L253 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 112 conjuncts are in the unsatisfiable core [2024-11-14 04:12:41,102 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:12:48,498 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:12:48,499 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:12:56,229 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:12:56,229 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1017555932] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:12:56,229 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [570757916] [2024-11-14 04:12:56,229 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:12:56,229 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:12:56,230 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:12:56,230 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:12:56,230 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:12:56,323 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:12:58,511 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17573#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_student_version_~i~1#1_1110| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_112| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_209| Int) (|v_ULTIMATE.start_student_version_~w#1_166| Int)) (and (<= 4 |v_ULTIMATE.start_student_version_~w#1_166|) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_112| 2147483648)) (<= |v_ULTIMATE.start_student_version_~w#1_166| |v_ULTIMATE.start_student_version_~i~1#1_1110|) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_112| 2147483647) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_209| |v_ULTIMATE.start_main_~is_divisible1~0#1_112|)) (or (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_209| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_1110| |v_ULTIMATE.start_student_version_~w#1_166|))) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_209| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_1110| |v_ULTIMATE.start_student_version_~w#1_166|))))) (= ~true~0 1) (= ~false~0 0))' at error location [2024-11-14 04:12:58,511 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:12:58,511 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:12:58,512 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 153 [2024-11-14 04:12:58,512 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [232971702] [2024-11-14 04:12:58,512 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:12:58,512 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 153 states [2024-11-14 04:12:58,512 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:12:58,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 153 interpolants. [2024-11-14 04:12:58,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=654, Invalid=25428, Unknown=0, NotChecked=0, Total=26082 [2024-11-14 04:12:58,514 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand has 153 states, 153 states have (on average 1.026143790849673) internal successors, (157), 153 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) [2024-11-14 04:13:07,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:13:07,246 INFO L93 Difference]: Finished difference Result 87 states and 90 transitions. [2024-11-14 04:13:07,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2024-11-14 04:13:07,246 INFO L78 Accepts]: Start accepts. Automaton has has 153 states, 153 states have (on average 1.026143790849673) internal successors, (157), 153 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 54 [2024-11-14 04:13:07,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:13:07,247 INFO L225 Difference]: With dead ends: 87 [2024-11-14 04:13:07,247 INFO L226 Difference]: Without dead ends: 56 [2024-11-14 04:13:07,248 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10375 ImplicationChecksByTransitivity, 22.0s TimeCoverageRelationStatistics Valid=1019, Invalid=35653, Unknown=0, NotChecked=0, Total=36672 [2024-11-14 04:13:07,249 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 42 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 5666 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 5760 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 5666 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2024-11-14 04:13:07,249 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 251 Invalid, 5760 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 5666 Invalid, 0 Unknown, 0 Unchecked, 3.8s Time] [2024-11-14 04:13:07,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2024-11-14 04:13:07,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2024-11-14 04:13:07,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 55 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) [2024-11-14 04:13:07,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2024-11-14 04:13:07,321 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 54 [2024-11-14 04:13:07,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:13:07,322 INFO L471 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2024-11-14 04:13:07,322 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 153 states, 153 states have (on average 1.026143790849673) internal successors, (157), 153 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) [2024-11-14 04:13:07,322 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2024-11-14 04:13:07,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2024-11-14 04:13:07,322 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:13:07,322 INFO L215 NwaCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:13:07,337 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2024-11-14 04:13:07,522 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:13:07,523 INFO L396 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:13:07,523 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:13:07,523 INFO L85 PathProgramCache]: Analyzing trace with hash -1414957146, now seen corresponding path program 37 times [2024-11-14 04:13:07,523 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:13:07,523 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1283177670] [2024-11-14 04:13:07,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:13:07,523 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:13:07,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:13:09,729 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 231 proven. 298 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:13:09,729 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:13:09,729 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1283177670] [2024-11-14 04:13:09,729 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1283177670] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:13:09,729 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1159453589] [2024-11-14 04:13:09,729 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 04:13:09,730 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:13:09,730 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:13:09,731 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:13:09,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2024-11-14 04:13:09,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:13:09,797 INFO L255 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 51 conjuncts are in the unsatisfiable core [2024-11-14 04:13:09,800 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:13:12,059 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 253 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:13:12,060 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:13:14,229 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 276 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:13:14,229 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1159453589] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:13:14,229 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [108569858] [2024-11-14 04:13:14,230 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:13:14,230 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:13:14,230 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:13:14,230 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:13:14,231 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:13:14,321 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:13:15,386 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18351#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0) (exists ((|v_ULTIMATE.start_student_version_~w#1_170| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_114| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_213| Int) (|v_ULTIMATE.start_student_version_~i~1#1_1161| Int)) (and (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_213| |v_ULTIMATE.start_main_~is_divisible1~0#1_114|)) (or (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_1161| |v_ULTIMATE.start_student_version_~w#1_170|)) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_213| 0)) (and (= |v_ULTIMATE.start_student_version_~i~1#1_1161| |v_ULTIMATE.start_student_version_~w#1_170|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_213| 1))) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_114| 2147483647) (<= |v_ULTIMATE.start_student_version_~w#1_170| |v_ULTIMATE.start_student_version_~i~1#1_1161|) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_114| 2147483648)) (<= 4 |v_ULTIMATE.start_student_version_~w#1_170|))))' at error location [2024-11-14 04:13:15,386 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:13:15,387 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:13:15,387 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51, 51] total 124 [2024-11-14 04:13:15,387 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1532790813] [2024-11-14 04:13:15,387 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:13:15,387 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 124 states [2024-11-14 04:13:15,387 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:13:15,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2024-11-14 04:13:15,389 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2865, Invalid=14691, Unknown=0, NotChecked=0, Total=17556 [2024-11-14 04:13:15,389 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand has 124 states, 124 states have (on average 1.064516129032258) internal successors, (132), 124 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:13:15,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:13:15,750 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2024-11-14 04:13:15,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2024-11-14 04:13:15,751 INFO L78 Accepts]: Start accepts. Automaton has has 124 states, 124 states have (on average 1.064516129032258) internal successors, (132), 124 states have internal predecessors, (132), 0 states have call successors, (0), 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 [2024-11-14 04:13:15,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:13:15,752 INFO L225 Difference]: With dead ends: 61 [2024-11-14 04:13:15,752 INFO L226 Difference]: Without dead ends: 57 [2024-11-14 04:13:15,752 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 61 SyntacticMatches, 23 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12584 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=2940, Invalid=14882, Unknown=0, NotChecked=0, Total=17822 [2024-11-14 04:13:15,753 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 360 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 360 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 04:13:15,753 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 24 Invalid, 360 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 360 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 04:13:15,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2024-11-14 04:13:15,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2024-11-14 04:13:15,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.0357142857142858) internal successors, (58), 56 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:13:15,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2024-11-14 04:13:15,837 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 55 [2024-11-14 04:13:15,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:13:15,837 INFO L471 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2024-11-14 04:13:15,837 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 124 states, 124 states have (on average 1.064516129032258) internal successors, (132), 124 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:13:15,837 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2024-11-14 04:13:15,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2024-11-14 04:13:15,838 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:13:15,838 INFO L215 NwaCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:13:15,851 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2024-11-14 04:13:16,038 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:13:16,038 INFO L396 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:13:16,038 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:13:16,038 INFO L85 PathProgramCache]: Analyzing trace with hash -955299461, now seen corresponding path program 38 times [2024-11-14 04:13:16,039 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:13:16,039 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496681311] [2024-11-14 04:13:16,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:13:16,039 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:13:16,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:13:19,007 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:13:19,007 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:13:19,007 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496681311] [2024-11-14 04:13:19,007 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [496681311] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:13:19,007 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [988381433] [2024-11-14 04:13:19,007 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 04:13:19,007 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:13:19,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:13:19,009 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:13:19,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2024-11-14 04:13:19,081 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2024-11-14 04:13:19,081 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:13:19,083 WARN L253 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 114 conjuncts are in the unsatisfiable core [2024-11-14 04:13:19,085 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:13:27,124 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:13:27,124 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:13:34,745 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:13:34,745 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [988381433] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:13:34,746 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1355103046] [2024-11-14 04:13:34,746 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:13:34,747 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:13:34,747 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:13:34,747 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:13:34,747 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:13:34,864 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:13:37,136 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19065#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0) (exists ((|v_ULTIMATE.start_student_version_~is_divisible~1#1_219| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_117| Int) (|v_ULTIMATE.start_student_version_~i~1#1_1215| Int) (|v_ULTIMATE.start_student_version_~w#1_174| Int)) (and (<= 4 |v_ULTIMATE.start_student_version_~w#1_174|) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_117| 2147483648)) (or (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_219| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_1215| |v_ULTIMATE.start_student_version_~w#1_174|)) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_219| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_1215| |v_ULTIMATE.start_student_version_~w#1_174|)))) (<= |v_ULTIMATE.start_student_version_~w#1_174| |v_ULTIMATE.start_student_version_~i~1#1_1215|) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_219| |v_ULTIMATE.start_main_~is_divisible1~0#1_117|)) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_117| 2147483647))))' at error location [2024-11-14 04:13:37,136 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:13:37,136 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:13:37,137 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 159 [2024-11-14 04:13:37,137 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166439229] [2024-11-14 04:13:37,137 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:13:37,138 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 159 states [2024-11-14 04:13:37,138 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:13:37,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 159 interpolants. [2024-11-14 04:13:37,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=654, Invalid=27402, Unknown=0, NotChecked=0, Total=28056 [2024-11-14 04:13:37,140 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand has 159 states, 159 states have (on average 1.0251572327044025) internal successors, (163), 159 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) [2024-11-14 04:13:47,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:13:47,705 INFO L93 Difference]: Finished difference Result 90 states and 93 transitions. [2024-11-14 04:13:47,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2024-11-14 04:13:47,706 INFO L78 Accepts]: Start accepts. Automaton has has 159 states, 159 states have (on average 1.0251572327044025) internal successors, (163), 159 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) Word has length 56 [2024-11-14 04:13:47,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:13:47,707 INFO L225 Difference]: With dead ends: 90 [2024-11-14 04:13:47,707 INFO L226 Difference]: Without dead ends: 58 [2024-11-14 04:13:47,709 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 197 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11152 ImplicationChecksByTransitivity, 24.3s TimeCoverageRelationStatistics Valid=1033, Invalid=38369, Unknown=0, NotChecked=0, Total=39402 [2024-11-14 04:13:47,709 INFO L432 NwaCegarLoop]: 2 mSDtfsCounter, 48 mSDsluCounter, 179 mSDsCounter, 0 mSdLazyCounter, 5821 mSolverCounterSat, 98 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 181 SdHoareTripleChecker+Invalid, 5919 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 5821 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2024-11-14 04:13:47,710 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 181 Invalid, 5919 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [98 Valid, 5821 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2024-11-14 04:13:47,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2024-11-14 04:13:47,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2024-11-14 04:13:47,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 57 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) [2024-11-14 04:13:47,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2024-11-14 04:13:47,829 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 56 [2024-11-14 04:13:47,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:13:47,829 INFO L471 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2024-11-14 04:13:47,829 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 159 states, 159 states have (on average 1.0251572327044025) internal successors, (163), 159 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) [2024-11-14 04:13:47,829 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2024-11-14 04:13:47,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2024-11-14 04:13:47,829 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:13:47,829 INFO L215 NwaCegarLoop]: trace histogram [24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:13:47,848 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2024-11-14 04:13:48,030 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2024-11-14 04:13:48,030 INFO L396 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:13:48,030 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:13:48,030 INFO L85 PathProgramCache]: Analyzing trace with hash 216320431, now seen corresponding path program 39 times [2024-11-14 04:13:48,030 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:13:48,031 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [721638375] [2024-11-14 04:13:48,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:13:48,031 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:13:48,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:13:50,616 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 253 proven. 323 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:13:50,617 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:13:50,617 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [721638375] [2024-11-14 04:13:50,617 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [721638375] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:13:50,617 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2106241822] [2024-11-14 04:13:50,617 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 04:13:50,617 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:13:50,617 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:13:50,619 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:13:50,620 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2024-11-14 04:13:50,697 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 04:13:50,697 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:13:50,699 INFO L255 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 53 conjuncts are in the unsatisfiable core [2024-11-14 04:13:50,701 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:13:53,653 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 276 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:13:53,654 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:13:56,883 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 300 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:13:56,883 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2106241822] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:13:56,883 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [317750228] [2024-11-14 04:13:56,884 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:13:56,884 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:13:56,885 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:13:56,885 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:13:56,885 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:13:57,003 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:13:58,414 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19872#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_student_version_~w#1_178| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_223| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_119| Int) (|v_ULTIMATE.start_student_version_~i~1#1_1269| Int)) (and (<= 4 |v_ULTIMATE.start_student_version_~w#1_178|) (<= |v_ULTIMATE.start_student_version_~w#1_178| |v_ULTIMATE.start_student_version_~i~1#1_1269|) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_119| 2147483647) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_119| 2147483648)) (or (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_223| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_1269| |v_ULTIMATE.start_student_version_~w#1_178|))) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_223| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_1269| |v_ULTIMATE.start_student_version_~w#1_178|))) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_223| |v_ULTIMATE.start_main_~is_divisible1~0#1_119|)))) (= ~true~0 1) (= ~false~0 0))' at error location [2024-11-14 04:13:58,414 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:13:58,414 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:13:58,414 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 53, 53] total 129 [2024-11-14 04:13:58,414 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [242171837] [2024-11-14 04:13:58,414 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:13:58,415 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 129 states [2024-11-14 04:13:58,415 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:13:58,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 129 interpolants. [2024-11-14 04:13:58,416 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3095, Invalid=15811, Unknown=0, NotChecked=0, Total=18906 [2024-11-14 04:13:58,416 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand has 129 states, 129 states have (on average 1.062015503875969) internal successors, (137), 129 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) [2024-11-14 04:13:59,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:13:59,017 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2024-11-14 04:13:59,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2024-11-14 04:13:59,018 INFO L78 Accepts]: Start accepts. Automaton has has 129 states, 129 states have (on average 1.062015503875969) internal successors, (137), 129 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 57 [2024-11-14 04:13:59,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:13:59,019 INFO L225 Difference]: With dead ends: 63 [2024-11-14 04:13:59,019 INFO L226 Difference]: Without dead ends: 59 [2024-11-14 04:13:59,020 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 63 SyntacticMatches, 24 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13596 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=3173, Invalid=16009, Unknown=0, NotChecked=0, Total=19182 [2024-11-14 04:13:59,020 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 482 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 482 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 482 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 04:13:59,020 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 40 Invalid, 482 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 482 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 04:13:59,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2024-11-14 04:13:59,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2024-11-14 04:13:59,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 58 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:13:59,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2024-11-14 04:13:59,133 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 57 [2024-11-14 04:13:59,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:13:59,133 INFO L471 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2024-11-14 04:13:59,133 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 129 states, 129 states have (on average 1.062015503875969) internal successors, (137), 129 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) [2024-11-14 04:13:59,133 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2024-11-14 04:13:59,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2024-11-14 04:13:59,134 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:13:59,134 INFO L215 NwaCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:13:59,156 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2024-11-14 04:13:59,334 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2024-11-14 04:13:59,334 INFO L396 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:13:59,335 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:13:59,335 INFO L85 PathProgramCache]: Analyzing trace with hash -1925302126, now seen corresponding path program 40 times [2024-11-14 04:13:59,335 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:13:59,335 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2019131862] [2024-11-14 04:13:59,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:13:59,335 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:13:59,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:14:02,986 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:14:02,986 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:14:02,986 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2019131862] [2024-11-14 04:14:02,987 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2019131862] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:14:02,987 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1644112964] [2024-11-14 04:14:02,987 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 04:14:02,987 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:14:02,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:14:02,988 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:14:02,990 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2024-11-14 04:14:03,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:14:03,063 WARN L253 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 116 conjuncts are in the unsatisfiable core [2024-11-14 04:14:03,065 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:14:08,237 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:14:08,238 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:14:16,104 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:14:16,104 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1644112964] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:14:16,104 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1569605463] [2024-11-14 04:14:16,105 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:14:16,105 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:14:16,105 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:14:16,105 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:14:16,105 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:14:16,205 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:14:18,526 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20585#(and (exists ((|v_ULTIMATE.start_student_version_~w#1_182| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_229| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_122| Int) (|v_ULTIMATE.start_student_version_~i~1#1_1325| Int)) (and (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_122| 2147483647) (<= 4 |v_ULTIMATE.start_student_version_~w#1_182|) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_229| |v_ULTIMATE.start_main_~is_divisible1~0#1_122|)) (<= |v_ULTIMATE.start_student_version_~w#1_182| |v_ULTIMATE.start_student_version_~i~1#1_1325|) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_122| 2147483648)) (or (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_1325| |v_ULTIMATE.start_student_version_~w#1_182|)) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_229| 0)) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_229| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_1325| |v_ULTIMATE.start_student_version_~w#1_182|))))) (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0))' at error location [2024-11-14 04:14:18,526 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:14:18,526 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:14:18,526 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 138 [2024-11-14 04:14:18,526 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354066040] [2024-11-14 04:14:18,526 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:14:18,526 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 138 states [2024-11-14 04:14:18,526 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:14:18,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 138 interpolants. [2024-11-14 04:14:18,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=20999, Unknown=0, NotChecked=0, Total=21462 [2024-11-14 04:14:18,528 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand has 138 states, 138 states have (on average 1.036231884057971) internal successors, (143), 138 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) [2024-11-14 04:14:29,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:14:29,045 INFO L93 Difference]: Finished difference Result 93 states and 96 transitions. [2024-11-14 04:14:29,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2024-11-14 04:14:29,045 INFO L78 Accepts]: Start accepts. Automaton has has 138 states, 138 states have (on average 1.036231884057971) internal successors, (143), 138 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) Word has length 58 [2024-11-14 04:14:29,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:14:29,046 INFO L225 Difference]: With dead ends: 93 [2024-11-14 04:14:29,047 INFO L226 Difference]: Without dead ends: 60 [2024-11-14 04:14:29,047 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 82 SyntacticMatches, 2 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8139 ImplicationChecksByTransitivity, 21.7s TimeCoverageRelationStatistics Valid=813, Invalid=30339, Unknown=0, NotChecked=0, Total=31152 [2024-11-14 04:14:29,048 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 36 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 6307 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 6409 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 6307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2024-11-14 04:14:29,048 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 262 Invalid, 6409 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 6307 Invalid, 0 Unknown, 0 Unchecked, 4.4s Time] [2024-11-14 04:14:29,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2024-11-14 04:14:29,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2024-11-14 04:14:29,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0338983050847457) internal successors, (61), 59 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) [2024-11-14 04:14:29,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2024-11-14 04:14:29,151 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 58 [2024-11-14 04:14:29,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:14:29,151 INFO L471 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2024-11-14 04:14:29,151 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 138 states, 138 states have (on average 1.036231884057971) internal successors, (143), 138 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) [2024-11-14 04:14:29,151 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2024-11-14 04:14:29,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2024-11-14 04:14:29,151 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:14:29,152 INFO L215 NwaCegarLoop]: trace histogram [25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:14:29,169 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2024-11-14 04:14:29,352 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:14:29,352 INFO L396 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:14:29,352 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:14:29,352 INFO L85 PathProgramCache]: Analyzing trace with hash -1280017466, now seen corresponding path program 41 times [2024-11-14 04:14:29,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:14:29,353 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370496009] [2024-11-14 04:14:29,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:14:29,353 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:14:29,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:14:32,357 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 276 proven. 349 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:14:32,357 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:14:32,357 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [370496009] [2024-11-14 04:14:32,357 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [370496009] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:14:32,357 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1031389089] [2024-11-14 04:14:32,357 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 04:14:32,357 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:14:32,357 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:14:32,359 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:14:32,360 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2024-11-14 04:14:32,440 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2024-11-14 04:14:32,440 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:14:32,443 INFO L255 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 55 conjuncts are in the unsatisfiable core [2024-11-14 04:14:32,444 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:14:35,640 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 300 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:14:35,641 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:14:38,614 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 325 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:14:38,614 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1031389089] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:14:38,614 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [343860036] [2024-11-14 04:14:38,615 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:14:38,615 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:14:38,616 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:14:38,616 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:14:38,616 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:14:38,721 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:14:40,107 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21417#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0) (exists ((|v_ULTIMATE.start_main_~is_divisible1~0#1_124| Int) (|v_ULTIMATE.start_student_version_~i~1#1_1380| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_233| Int) (|v_ULTIMATE.start_student_version_~w#1_186| Int)) (and (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_124| 2147483648)) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_233| |v_ULTIMATE.start_main_~is_divisible1~0#1_124|)) (<= 4 |v_ULTIMATE.start_student_version_~w#1_186|) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_124| 2147483647) (or (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_233| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_1380| |v_ULTIMATE.start_student_version_~w#1_186|))) (and (= |v_ULTIMATE.start_student_version_~i~1#1_1380| |v_ULTIMATE.start_student_version_~w#1_186|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_233| 1))) (<= |v_ULTIMATE.start_student_version_~w#1_186| |v_ULTIMATE.start_student_version_~i~1#1_1380|))))' at error location [2024-11-14 04:14:40,107 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:14:40,107 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:14:40,107 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 55, 55] total 134 [2024-11-14 04:14:40,107 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582257194] [2024-11-14 04:14:40,107 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:14:40,108 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 134 states [2024-11-14 04:14:40,108 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:14:40,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2024-11-14 04:14:40,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3334, Invalid=16972, Unknown=0, NotChecked=0, Total=20306 [2024-11-14 04:14:40,109 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand has 134 states, 134 states have (on average 1.0597014925373134) internal successors, (142), 134 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:14:40,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:14:40,628 INFO L93 Difference]: Finished difference Result 65 states and 66 transitions. [2024-11-14 04:14:40,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2024-11-14 04:14:40,629 INFO L78 Accepts]: Start accepts. Automaton has has 134 states, 134 states have (on average 1.0597014925373134) internal successors, (142), 134 states have internal predecessors, (142), 0 states have call successors, (0), 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 59 [2024-11-14 04:14:40,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:14:40,630 INFO L225 Difference]: With dead ends: 65 [2024-11-14 04:14:40,630 INFO L226 Difference]: Without dead ends: 61 [2024-11-14 04:14:40,630 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 65 SyntacticMatches, 25 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14647 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=3415, Invalid=17177, Unknown=0, NotChecked=0, Total=20592 [2024-11-14 04:14:40,631 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 470 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 470 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 470 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-14 04:14:40,631 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 33 Invalid, 470 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 470 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-14 04:14:40,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2024-11-14 04:14:40,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2024-11-14 04:14:40,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.0333333333333334) internal successors, (62), 60 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) [2024-11-14 04:14:40,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2024-11-14 04:14:40,718 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 59 [2024-11-14 04:14:40,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:14:40,718 INFO L471 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2024-11-14 04:14:40,718 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 134 states, 134 states have (on average 1.0597014925373134) internal successors, (142), 134 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:14:40,719 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2024-11-14 04:14:40,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2024-11-14 04:14:40,719 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:14:40,719 INFO L215 NwaCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:14:40,737 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2024-11-14 04:14:40,919 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:14:40,920 INFO L396 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:14:40,920 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:14:40,920 INFO L85 PathProgramCache]: Analyzing trace with hash -1067136677, now seen corresponding path program 42 times [2024-11-14 04:14:40,920 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:14:40,920 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1765730862] [2024-11-14 04:14:40,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:14:40,920 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:14:40,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:14:44,712 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:14:44,712 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:14:44,712 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1765730862] [2024-11-14 04:14:44,712 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1765730862] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:14:44,712 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [231640904] [2024-11-14 04:14:44,712 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 04:14:44,712 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:14:44,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:14:44,714 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:14:44,717 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2024-11-14 04:14:44,781 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 04:14:44,781 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:14:44,784 WARN L253 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 124 conjuncts are in the unsatisfiable core [2024-11-14 04:14:44,785 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:14:55,134 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:14:55,135 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:15:05,063 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:15:05,063 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [231640904] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:15:05,063 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [489840218] [2024-11-14 04:15:05,064 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:15:05,064 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:15:05,064 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:15:05,064 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:15:05,064 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:15:05,156 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:15:07,944 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22183#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_student_version_~is_divisible~1#1_239| Int) (|v_ULTIMATE.start_student_version_~w#1_190| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_127| Int) (|v_ULTIMATE.start_student_version_~i~1#1_1437| Int)) (and (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_239| |v_ULTIMATE.start_main_~is_divisible1~0#1_127|)) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_127| 2147483648)) (or (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_239| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_1437| |v_ULTIMATE.start_student_version_~w#1_190|))) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_239| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_1437| |v_ULTIMATE.start_student_version_~w#1_190|))) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_127| 2147483647) (<= 4 |v_ULTIMATE.start_student_version_~w#1_190|) (<= |v_ULTIMATE.start_student_version_~w#1_190| |v_ULTIMATE.start_student_version_~i~1#1_1437|))) (= ~true~0 1) (= ~false~0 0))' at error location [2024-11-14 04:15:07,944 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:15:07,944 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:15:07,944 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 171 [2024-11-14 04:15:07,944 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1821703873] [2024-11-14 04:15:07,945 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:15:07,945 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 171 states [2024-11-14 04:15:07,945 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:15:07,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 171 interpolants. [2024-11-14 04:15:07,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=729, Invalid=31491, Unknown=0, NotChecked=0, Total=32220 [2024-11-14 04:15:07,947 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand has 171 states, 171 states have (on average 1.023391812865497) internal successors, (175), 171 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) [2024-11-14 04:15:19,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:15:19,805 INFO L93 Difference]: Finished difference Result 96 states and 99 transitions. [2024-11-14 04:15:19,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2024-11-14 04:15:19,806 INFO L78 Accepts]: Start accepts. Automaton has has 171 states, 171 states have (on average 1.023391812865497) internal successors, (175), 171 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) Word has length 60 [2024-11-14 04:15:19,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:15:19,807 INFO L225 Difference]: With dead ends: 96 [2024-11-14 04:15:19,807 INFO L226 Difference]: Without dead ends: 62 [2024-11-14 04:15:19,809 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 211 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12796 ImplicationChecksByTransitivity, 29.8s TimeCoverageRelationStatistics Valid=1136, Invalid=44020, Unknown=0, NotChecked=0, Total=45156 [2024-11-14 04:15:19,809 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 51 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 6752 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 6858 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 6752 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2024-11-14 04:15:19,809 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 265 Invalid, 6858 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 6752 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2024-11-14 04:15:19,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2024-11-14 04:15:19,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2024-11-14 04:15:19,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 61 states have (on average 1.0327868852459017) internal successors, (63), 61 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:15:19,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2024-11-14 04:15:19,914 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 60 [2024-11-14 04:15:19,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:15:19,914 INFO L471 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2024-11-14 04:15:19,914 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 171 states, 171 states have (on average 1.023391812865497) internal successors, (175), 171 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) [2024-11-14 04:15:19,915 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2024-11-14 04:15:19,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2024-11-14 04:15:19,915 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:15:19,915 INFO L215 NwaCegarLoop]: trace histogram [26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:15:19,931 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2024-11-14 04:15:20,115 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2024-11-14 04:15:20,116 INFO L396 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:15:20,116 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:15:20,116 INFO L85 PathProgramCache]: Analyzing trace with hash 576130959, now seen corresponding path program 43 times [2024-11-14 04:15:20,116 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:15:20,116 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2035340108] [2024-11-14 04:15:20,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:15:20,116 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:15:20,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:15:22,894 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 300 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:15:22,894 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:15:22,894 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2035340108] [2024-11-14 04:15:22,894 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2035340108] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:15:22,894 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1260265132] [2024-11-14 04:15:22,894 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 04:15:22,894 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:15:22,894 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:15:22,896 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:15:22,897 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2024-11-14 04:15:22,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:15:22,964 INFO L255 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 57 conjuncts are in the unsatisfiable core [2024-11-14 04:15:22,967 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:15:26,067 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 325 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:15:26,067 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:15:29,130 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 351 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:15:29,130 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1260265132] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:15:29,130 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [751408292] [2024-11-14 04:15:29,131 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:15:29,131 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:15:29,131 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:15:29,131 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:15:29,132 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:15:29,238 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:15:30,555 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23048#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0) (exists ((|v_ULTIMATE.start_student_version_~i~1#1_1495| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_129| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_243| Int) (|v_ULTIMATE.start_student_version_~w#1_194| Int)) (and (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_243| |v_ULTIMATE.start_main_~is_divisible1~0#1_129|)) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_129| 2147483647) (<= 4 |v_ULTIMATE.start_student_version_~w#1_194|) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_129| 2147483648)) (or (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_243| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_1495| |v_ULTIMATE.start_student_version_~w#1_194|))) (and (= |v_ULTIMATE.start_student_version_~i~1#1_1495| |v_ULTIMATE.start_student_version_~w#1_194|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_243| 1))) (<= |v_ULTIMATE.start_student_version_~w#1_194| |v_ULTIMATE.start_student_version_~i~1#1_1495|))))' at error location [2024-11-14 04:15:30,555 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:15:30,555 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:15:30,555 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 57, 57] total 139 [2024-11-14 04:15:30,555 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1060207540] [2024-11-14 04:15:30,555 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:15:30,555 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 139 states [2024-11-14 04:15:30,556 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:15:30,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2024-11-14 04:15:30,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3582, Invalid=18174, Unknown=0, NotChecked=0, Total=21756 [2024-11-14 04:15:30,558 INFO L87 Difference]: Start difference. First operand 62 states and 63 transitions. Second operand has 139 states, 139 states have (on average 1.0575539568345325) internal successors, (147), 139 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) [2024-11-14 04:15:31,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:15:31,136 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2024-11-14 04:15:31,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2024-11-14 04:15:31,136 INFO L78 Accepts]: Start accepts. Automaton has has 139 states, 139 states have (on average 1.0575539568345325) internal successors, (147), 139 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 61 [2024-11-14 04:15:31,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:15:31,137 INFO L225 Difference]: With dead ends: 67 [2024-11-14 04:15:31,137 INFO L226 Difference]: Without dead ends: 63 [2024-11-14 04:15:31,138 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 67 SyntacticMatches, 26 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15737 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=3666, Invalid=18386, Unknown=0, NotChecked=0, Total=22052 [2024-11-14 04:15:31,139 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 545 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 545 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 545 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 04:15:31,139 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 39 Invalid, 545 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 545 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 04:15:31,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2024-11-14 04:15:31,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2024-11-14 04:15:31,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.032258064516129) internal successors, (64), 62 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:15:31,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2024-11-14 04:15:31,254 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 61 [2024-11-14 04:15:31,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:15:31,255 INFO L471 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2024-11-14 04:15:31,255 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 139 states, 139 states have (on average 1.0575539568345325) internal successors, (147), 139 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) [2024-11-14 04:15:31,255 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2024-11-14 04:15:31,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2024-11-14 04:15:31,255 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:15:31,255 INFO L215 NwaCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:15:31,271 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Ended with exit code 0 [2024-11-14 04:15:31,455 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2024-11-14 04:15:31,456 INFO L396 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:15:31,456 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:15:31,456 INFO L85 PathProgramCache]: Analyzing trace with hash 638889650, now seen corresponding path program 44 times [2024-11-14 04:15:31,456 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:15:31,456 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1508067380] [2024-11-14 04:15:31,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:15:31,456 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:15:31,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:15:35,578 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:15:35,578 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:15:35,578 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1508067380] [2024-11-14 04:15:35,578 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1508067380] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:15:35,578 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [655078734] [2024-11-14 04:15:35,578 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 04:15:35,579 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:15:35,579 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:15:35,580 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:15:35,581 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2024-11-14 04:15:35,658 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2024-11-14 04:15:35,659 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:15:35,661 WARN L253 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 126 conjuncts are in the unsatisfiable core [2024-11-14 04:15:35,662 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:15:46,425 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:15:46,425 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:15:56,803 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:15:56,803 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [655078734] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:15:56,803 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [78105968] [2024-11-14 04:15:56,804 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:15:56,804 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:15:56,805 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:15:56,805 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:15:56,805 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:15:56,950 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:15:59,939 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23840#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0) (exists ((|v_ULTIMATE.start_main_~is_divisible1~0#1_132| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_249| Int) (|v_ULTIMATE.start_student_version_~w#1_198| Int) (|v_ULTIMATE.start_student_version_~i~1#1_1554| Int)) (and (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_132| 2147483647) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_249| |v_ULTIMATE.start_main_~is_divisible1~0#1_132|)) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_132| 2147483648)) (<= |v_ULTIMATE.start_student_version_~w#1_198| |v_ULTIMATE.start_student_version_~i~1#1_1554|) (or (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_249| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_1554| |v_ULTIMATE.start_student_version_~w#1_198|))) (and (= |v_ULTIMATE.start_student_version_~i~1#1_1554| |v_ULTIMATE.start_student_version_~w#1_198|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_249| 1))) (<= 4 |v_ULTIMATE.start_student_version_~w#1_198|))))' at error location [2024-11-14 04:15:59,939 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:15:59,939 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:15:59,939 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 177 [2024-11-14 04:15:59,940 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835130528] [2024-11-14 04:15:59,940 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:15:59,940 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 177 states [2024-11-14 04:15:59,940 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:15:59,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 177 interpolants. [2024-11-14 04:15:59,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=726, Invalid=33684, Unknown=0, NotChecked=0, Total=34410 [2024-11-14 04:15:59,942 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand has 177 states, 177 states have (on average 1.0225988700564972) internal successors, (181), 177 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) [2024-11-14 04:16:13,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:16:13,559 INFO L93 Difference]: Finished difference Result 99 states and 102 transitions. [2024-11-14 04:16:13,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2024-11-14 04:16:13,560 INFO L78 Accepts]: Start accepts. Automaton has has 177 states, 177 states have (on average 1.0225988700564972) internal successors, (181), 177 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) Word has length 62 [2024-11-14 04:16:13,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:16:13,560 INFO L225 Difference]: With dead ends: 99 [2024-11-14 04:16:13,560 INFO L226 Difference]: Without dead ends: 64 [2024-11-14 04:16:13,562 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 218 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13657 ImplicationChecksByTransitivity, 32.2s TimeCoverageRelationStatistics Valid=1147, Invalid=47033, Unknown=0, NotChecked=0, Total=48180 [2024-11-14 04:16:13,562 INFO L432 NwaCegarLoop]: 2 mSDtfsCounter, 53 mSDsluCounter, 216 mSDsCounter, 0 mSdLazyCounter, 7581 mSolverCounterSat, 110 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 218 SdHoareTripleChecker+Invalid, 7691 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 110 IncrementalHoareTripleChecker+Valid, 7581 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.9s IncrementalHoareTripleChecker+Time [2024-11-14 04:16:13,562 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 218 Invalid, 7691 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [110 Valid, 7581 Invalid, 0 Unknown, 0 Unchecked, 5.9s Time] [2024-11-14 04:16:13,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2024-11-14 04:16:13,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2024-11-14 04:16:13,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 63 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) [2024-11-14 04:16:13,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2024-11-14 04:16:13,660 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 62 [2024-11-14 04:16:13,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:16:13,660 INFO L471 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2024-11-14 04:16:13,660 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 177 states, 177 states have (on average 1.0225988700564972) internal successors, (181), 177 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) [2024-11-14 04:16:13,661 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2024-11-14 04:16:13,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2024-11-14 04:16:13,661 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:16:13,661 INFO L215 NwaCegarLoop]: trace histogram [27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:16:13,677 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2024-11-14 04:16:13,861 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2024-11-14 04:16:13,862 INFO L396 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:16:13,862 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:16:13,862 INFO L85 PathProgramCache]: Analyzing trace with hash -728877082, now seen corresponding path program 45 times [2024-11-14 04:16:13,862 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:16:13,862 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [306567354] [2024-11-14 04:16:13,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:16:13,863 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:16:13,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:16:16,937 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 325 proven. 404 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:16:16,937 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:16:16,937 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [306567354] [2024-11-14 04:16:16,937 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [306567354] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:16:16,937 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1429039818] [2024-11-14 04:16:16,937 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 04:16:16,937 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:16:16,937 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:16:16,939 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:16:16,940 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2024-11-14 04:16:17,028 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 04:16:17,028 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:16:17,031 INFO L255 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 59 conjuncts are in the unsatisfiable core [2024-11-14 04:16:17,034 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:16:20,723 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 351 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:16:20,724 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:16:24,143 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 378 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:16:24,143 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1429039818] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:16:24,143 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [179732685] [2024-11-14 04:16:24,144 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:16:24,144 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:16:24,144 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:16:24,144 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:16:24,144 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:16:24,258 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:16:25,687 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24734#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0) (exists ((|v_ULTIMATE.start_main_~is_divisible1~0#1_134| Int) (|v_ULTIMATE.start_student_version_~w#1_202| Int) (|v_ULTIMATE.start_student_version_~i~1#1_1613| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_253| Int)) (and (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_134| 2147483648)) (or (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_1613| |v_ULTIMATE.start_student_version_~w#1_202|)) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_253| 0)) (and (= |v_ULTIMATE.start_student_version_~i~1#1_1613| |v_ULTIMATE.start_student_version_~w#1_202|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_253| 1))) (<= 4 |v_ULTIMATE.start_student_version_~w#1_202|) (<= |v_ULTIMATE.start_student_version_~w#1_202| |v_ULTIMATE.start_student_version_~i~1#1_1613|) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_134| 2147483647) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_253| |v_ULTIMATE.start_main_~is_divisible1~0#1_134|)))))' at error location [2024-11-14 04:16:25,687 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:16:25,687 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:16:25,687 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 59, 59] total 144 [2024-11-14 04:16:25,687 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1938654142] [2024-11-14 04:16:25,687 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:16:25,688 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 144 states [2024-11-14 04:16:25,688 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:16:25,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 144 interpolants. [2024-11-14 04:16:25,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3839, Invalid=19417, Unknown=0, NotChecked=0, Total=23256 [2024-11-14 04:16:25,690 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand has 144 states, 144 states have (on average 1.0555555555555556) internal successors, (152), 144 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) [2024-11-14 04:16:26,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:16:26,355 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2024-11-14 04:16:26,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2024-11-14 04:16:26,356 INFO L78 Accepts]: Start accepts. Automaton has has 144 states, 144 states have (on average 1.0555555555555556) internal successors, (152), 144 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 63 [2024-11-14 04:16:26,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:16:26,357 INFO L225 Difference]: With dead ends: 69 [2024-11-14 04:16:26,357 INFO L226 Difference]: Without dead ends: 65 [2024-11-14 04:16:26,358 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 69 SyntacticMatches, 27 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16866 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=3926, Invalid=19636, Unknown=0, NotChecked=0, Total=23562 [2024-11-14 04:16:26,358 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 578 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 578 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 578 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 04:16:26,359 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 36 Invalid, 578 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 578 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 04:16:26,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2024-11-14 04:16:26,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2024-11-14 04:16:26,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.03125) internal successors, (66), 64 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:16:26,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 66 transitions. [2024-11-14 04:16:26,461 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 66 transitions. Word has length 63 [2024-11-14 04:16:26,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:16:26,461 INFO L471 AbstractCegarLoop]: Abstraction has 65 states and 66 transitions. [2024-11-14 04:16:26,461 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 144 states, 144 states have (on average 1.0555555555555556) internal successors, (152), 144 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) [2024-11-14 04:16:26,461 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 66 transitions. [2024-11-14 04:16:26,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2024-11-14 04:16:26,462 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:16:26,462 INFO L215 NwaCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:16:26,483 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2024-11-14 04:16:26,662 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable50 [2024-11-14 04:16:26,662 INFO L396 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:16:26,663 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:16:26,663 INFO L85 PathProgramCache]: Analyzing trace with hash -1161653957, now seen corresponding path program 46 times [2024-11-14 04:16:26,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:16:26,663 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1163725547] [2024-11-14 04:16:26,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:16:26,663 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:16:26,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:16:31,267 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:16:31,267 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:16:31,267 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1163725547] [2024-11-14 04:16:31,267 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1163725547] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:16:31,267 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [125523849] [2024-11-14 04:16:31,267 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 04:16:31,267 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:16:31,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:16:31,269 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:16:31,271 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2024-11-14 04:16:31,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:16:31,350 WARN L253 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 128 conjuncts are in the unsatisfiable core [2024-11-14 04:16:31,352 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:16:37,583 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:16:37,584 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:16:47,571 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:16:47,571 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [125523849] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:16:47,572 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [818448498] [2024-11-14 04:16:47,573 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:16:47,573 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:16:47,573 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:16:47,573 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:16:47,573 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:16:47,686 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:16:50,358 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25522#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0) (exists ((|v_ULTIMATE.start_student_version_~w#1_206| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_137| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_259| Int) (|v_ULTIMATE.start_student_version_~i~1#1_1675| Int)) (and (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_137| 2147483648)) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_259| |v_ULTIMATE.start_main_~is_divisible1~0#1_137|)) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_137| 2147483647) (or (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_1675| |v_ULTIMATE.start_student_version_~w#1_206|)) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_259| 0)) (and (= |v_ULTIMATE.start_student_version_~i~1#1_1675| |v_ULTIMATE.start_student_version_~w#1_206|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_259| 1))) (<= 4 |v_ULTIMATE.start_student_version_~w#1_206|) (<= |v_ULTIMATE.start_student_version_~w#1_206| |v_ULTIMATE.start_student_version_~i~1#1_1675|))))' at error location [2024-11-14 04:16:50,358 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:16:50,358 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:16:50,358 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 153 [2024-11-14 04:16:50,358 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1408798580] [2024-11-14 04:16:50,358 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:16:50,359 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 153 states [2024-11-14 04:16:50,359 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:16:50,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 153 interpolants. [2024-11-14 04:16:50,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=511, Invalid=25571, Unknown=0, NotChecked=0, Total=26082 [2024-11-14 04:16:50,361 INFO L87 Difference]: Start difference. First operand 65 states and 66 transitions. Second operand has 153 states, 153 states have (on average 1.0326797385620916) internal successors, (158), 153 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) [2024-11-14 04:17:03,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:17:03,319 INFO L93 Difference]: Finished difference Result 102 states and 105 transitions. [2024-11-14 04:17:03,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2024-11-14 04:17:03,319 INFO L78 Accepts]: Start accepts. Automaton has has 153 states, 153 states have (on average 1.0326797385620916) internal successors, (158), 153 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 64 [2024-11-14 04:17:03,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:17:03,320 INFO L225 Difference]: With dead ends: 102 [2024-11-14 04:17:03,320 INFO L226 Difference]: Without dead ends: 66 [2024-11-14 04:17:03,321 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9897 ImplicationChecksByTransitivity, 27.1s TimeCoverageRelationStatistics Valid=900, Invalid=36930, Unknown=0, NotChecked=0, Total=37830 [2024-11-14 04:17:03,322 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 41 mSDsluCounter, 265 mSDsCounter, 0 mSdLazyCounter, 7247 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 7361 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 7247 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.4s IncrementalHoareTripleChecker+Time [2024-11-14 04:17:03,322 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 268 Invalid, 7361 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 7247 Invalid, 0 Unknown, 0 Unchecked, 5.4s Time] [2024-11-14 04:17:03,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2024-11-14 04:17:03,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2024-11-14 04:17:03,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 65 states have (on average 1.0307692307692307) internal successors, (67), 65 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) [2024-11-14 04:17:03,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2024-11-14 04:17:03,428 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 64 [2024-11-14 04:17:03,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:17:03,428 INFO L471 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2024-11-14 04:17:03,428 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 153 states, 153 states have (on average 1.0326797385620916) internal successors, (158), 153 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) [2024-11-14 04:17:03,428 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2024-11-14 04:17:03,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2024-11-14 04:17:03,428 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:17:03,428 INFO L215 NwaCegarLoop]: trace histogram [28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:17:03,449 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Ended with exit code 0 [2024-11-14 04:17:03,629 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51 [2024-11-14 04:17:03,629 INFO L396 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:17:03,629 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:17:03,629 INFO L85 PathProgramCache]: Analyzing trace with hash -1325490833, now seen corresponding path program 47 times [2024-11-14 04:17:03,629 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:17:03,629 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1703413949] [2024-11-14 04:17:03,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:17:03,630 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:17:03,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:17:06,881 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 351 proven. 433 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:17:06,882 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:17:06,882 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1703413949] [2024-11-14 04:17:06,882 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1703413949] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:17:06,882 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [752819237] [2024-11-14 04:17:06,882 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 04:17:06,882 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:17:06,882 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:17:06,884 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:17:06,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2024-11-14 04:17:06,979 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2024-11-14 04:17:06,979 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:17:06,982 INFO L255 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 61 conjuncts are in the unsatisfiable core [2024-11-14 04:17:06,983 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:17:10,768 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 378 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:17:10,768 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:17:14,390 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 406 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:17:14,391 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [752819237] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:17:14,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [836779098] [2024-11-14 04:17:14,392 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:17:14,392 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:17:14,392 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:17:14,392 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:17:14,392 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:17:14,535 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:17:16,003 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26441#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0) (exists ((|v_ULTIMATE.start_student_version_~i~1#1_1737| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_139| Int) (|v_ULTIMATE.start_student_version_~w#1_210| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_263| Int)) (and (<= 4 |v_ULTIMATE.start_student_version_~w#1_210|) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_139| 2147483648)) (or (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_263| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_1737| |v_ULTIMATE.start_student_version_~w#1_210|)) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_263| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_1737| |v_ULTIMATE.start_student_version_~w#1_210|)))) (<= |v_ULTIMATE.start_student_version_~w#1_210| |v_ULTIMATE.start_student_version_~i~1#1_1737|) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_263| |v_ULTIMATE.start_main_~is_divisible1~0#1_139|)) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_139| 2147483647))))' at error location [2024-11-14 04:17:16,003 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:17:16,003 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:17:16,003 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 61, 61] total 149 [2024-11-14 04:17:16,003 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099061038] [2024-11-14 04:17:16,003 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:17:16,004 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 149 states [2024-11-14 04:17:16,004 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:17:16,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 149 interpolants. [2024-11-14 04:17:16,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4105, Invalid=20701, Unknown=0, NotChecked=0, Total=24806 [2024-11-14 04:17:16,007 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand has 149 states, 149 states have (on average 1.0536912751677852) internal successors, (157), 149 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) [2024-11-14 04:17:16,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:17:16,631 INFO L93 Difference]: Finished difference Result 71 states and 72 transitions. [2024-11-14 04:17:16,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2024-11-14 04:17:16,631 INFO L78 Accepts]: Start accepts. Automaton has has 149 states, 149 states have (on average 1.0536912751677852) internal successors, (157), 149 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 65 [2024-11-14 04:17:16,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:17:16,632 INFO L225 Difference]: With dead ends: 71 [2024-11-14 04:17:16,632 INFO L226 Difference]: Without dead ends: 67 [2024-11-14 04:17:16,633 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 71 SyntacticMatches, 28 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18034 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=4195, Invalid=20927, Unknown=0, NotChecked=0, Total=25122 [2024-11-14 04:17:16,634 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 515 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 515 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 515 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 04:17:16,634 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 33 Invalid, 515 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 515 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 04:17:16,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2024-11-14 04:17:16,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2024-11-14 04:17:16,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 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) [2024-11-14 04:17:16,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2024-11-14 04:17:16,744 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 65 [2024-11-14 04:17:16,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:17:16,744 INFO L471 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2024-11-14 04:17:16,744 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 149 states, 149 states have (on average 1.0536912751677852) internal successors, (157), 149 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) [2024-11-14 04:17:16,744 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2024-11-14 04:17:16,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2024-11-14 04:17:16,745 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:17:16,745 INFO L215 NwaCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:17:16,761 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Ended with exit code 0 [2024-11-14 04:17:16,945 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2024-11-14 04:17:16,946 INFO L396 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:17:16,946 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:17:16,946 INFO L85 PathProgramCache]: Analyzing trace with hash 1818156242, now seen corresponding path program 48 times [2024-11-14 04:17:16,946 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:17:16,946 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1668258499] [2024-11-14 04:17:16,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:17:16,946 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:17:16,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:17:21,665 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:17:21,665 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:17:21,665 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1668258499] [2024-11-14 04:17:21,665 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1668258499] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:17:21,666 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [508254097] [2024-11-14 04:17:21,666 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 04:17:21,666 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:17:21,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:17:21,668 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:17:21,670 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2024-11-14 04:17:21,754 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 04:17:21,754 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:17:21,756 WARN L253 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 138 conjuncts are in the unsatisfiable core [2024-11-14 04:17:21,758 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:17:34,787 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:17:34,787 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:17:50,830 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:17:50,830 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [508254097] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:17:50,830 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1755772813] [2024-11-14 04:17:50,832 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:17:50,832 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:17:50,832 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:17:50,832 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:17:50,832 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:17:50,945 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:17:54,281 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27285#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0) (exists ((|v_ULTIMATE.start_main_~is_divisible1~0#1_142| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_269| Int) (|v_ULTIMATE.start_student_version_~w#1_214| Int) (|v_ULTIMATE.start_student_version_~i~1#1_1801| Int)) (and (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_142| 2147483648)) (<= 4 |v_ULTIMATE.start_student_version_~w#1_214|) (<= |v_ULTIMATE.start_student_version_~w#1_214| |v_ULTIMATE.start_student_version_~i~1#1_1801|) (or (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_269| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_1801| |v_ULTIMATE.start_student_version_~w#1_214|)) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_269| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_1801| |v_ULTIMATE.start_student_version_~w#1_214|)))) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_142| 2147483647) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_269| |v_ULTIMATE.start_main_~is_divisible1~0#1_142|)))))' at error location [2024-11-14 04:17:54,281 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:17:54,281 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:17:54,282 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 189 [2024-11-14 04:17:54,282 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2062337849] [2024-11-14 04:17:54,282 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:17:54,282 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 189 states [2024-11-14 04:17:54,282 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:17:54,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 189 interpolants. [2024-11-14 04:17:54,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=897, Invalid=38109, Unknown=0, NotChecked=0, Total=39006 [2024-11-14 04:17:54,284 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand has 189 states, 189 states have (on average 1.0211640211640212) internal successors, (193), 189 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) [2024-11-14 04:18:27,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:18:27,359 INFO L93 Difference]: Finished difference Result 168 states and 202 transitions. [2024-11-14 04:18:27,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2024-11-14 04:18:27,359 INFO L78 Accepts]: Start accepts. Automaton has has 189 states, 189 states have (on average 1.0211640211640212) internal successors, (193), 189 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) Word has length 66 [2024-11-14 04:18:27,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:18:27,361 INFO L225 Difference]: With dead ends: 168 [2024-11-14 04:18:27,361 INFO L226 Difference]: Without dead ends: 130 [2024-11-14 04:18:27,362 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 266 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21144 ImplicationChecksByTransitivity, 57.9s TimeCoverageRelationStatistics Valid=2395, Invalid=69161, Unknown=0, NotChecked=0, Total=71556 [2024-11-14 04:18:27,363 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 229 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 6497 mSolverCounterSat, 880 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 229 SdHoareTripleChecker+Valid, 226 SdHoareTripleChecker+Invalid, 7377 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 880 IncrementalHoareTripleChecker+Valid, 6497 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.5s IncrementalHoareTripleChecker+Time [2024-11-14 04:18:27,363 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [229 Valid, 226 Invalid, 7377 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [880 Valid, 6497 Invalid, 0 Unknown, 0 Unchecked, 6.5s Time] [2024-11-14 04:18:27,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2024-11-14 04:18:27,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 100. [2024-11-14 04:18:27,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 99 states have (on average 1.3131313131313131) internal successors, (130), 99 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:18:27,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 130 transitions. [2024-11-14 04:18:27,619 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 130 transitions. Word has length 66 [2024-11-14 04:18:27,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:18:27,619 INFO L471 AbstractCegarLoop]: Abstraction has 100 states and 130 transitions. [2024-11-14 04:18:27,619 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 189 states, 189 states have (on average 1.0211640211640212) internal successors, (193), 189 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) [2024-11-14 04:18:27,619 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 130 transitions. [2024-11-14 04:18:27,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2024-11-14 04:18:27,620 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:18:27,620 INFO L215 NwaCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:18:27,640 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Ended with exit code 0 [2024-11-14 04:18:27,820 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:18:27,820 INFO L396 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:18:27,820 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:18:27,820 INFO L85 PathProgramCache]: Analyzing trace with hash -1294556901, now seen corresponding path program 49 times [2024-11-14 04:18:27,820 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:18:27,821 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2075961968] [2024-11-14 04:18:27,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:18:27,821 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:18:27,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:18:32,779 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:18:32,779 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:18:32,779 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2075961968] [2024-11-14 04:18:32,779 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2075961968] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:18:32,779 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1282865327] [2024-11-14 04:18:32,779 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 04:18:32,779 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:18:32,779 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:18:32,781 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:18:32,782 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2024-11-14 04:18:32,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:18:32,868 WARN L253 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 136 conjuncts are in the unsatisfiable core [2024-11-14 04:18:32,870 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:18:39,650 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:18:39,650 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:18:50,996 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:18:50,996 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1282865327] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:18:50,996 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [20383104] [2024-11-14 04:18:50,997 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:18:50,997 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:18:50,997 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:18:50,997 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:18:50,997 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:18:51,103 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:18:53,858 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28504#(and (<= 1 |#StackHeapBarrier|) (= ~true~0 1) (= ~false~0 0) (exists ((|v_ULTIMATE.start_main_~is_divisible1~0#1_145| Int) (|v_ULTIMATE.start_student_version_~w#1_218| Int) (|v_ULTIMATE.start_student_version_~i~1#1_1866| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_275| Int)) (and (<= 4 |v_ULTIMATE.start_student_version_~w#1_218|) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_145| 2147483647) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_275| |v_ULTIMATE.start_main_~is_divisible1~0#1_145|)) (<= |v_ULTIMATE.start_student_version_~w#1_218| |v_ULTIMATE.start_student_version_~i~1#1_1866|) (or (and (= |v_ULTIMATE.start_student_version_~i~1#1_1866| |v_ULTIMATE.start_student_version_~w#1_218|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_275| 1)) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_275| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_1866| |v_ULTIMATE.start_student_version_~w#1_218|)))) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_145| 2147483648)))))' at error location [2024-11-14 04:18:53,858 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:18:53,858 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:18:53,858 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 163 [2024-11-14 04:18:53,858 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546042535] [2024-11-14 04:18:53,858 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:18:53,859 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 163 states [2024-11-14 04:18:53,859 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:18:53,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 163 interpolants. [2024-11-14 04:18:53,860 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=543, Invalid=28869, Unknown=0, NotChecked=0, Total=29412 [2024-11-14 04:18:53,861 INFO L87 Difference]: Start difference. First operand 100 states and 130 transitions. Second operand has 163 states, 163 states have (on average 1.030674846625767) internal successors, (168), 163 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:19:08,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:19:08,425 INFO L93 Difference]: Finished difference Result 138 states and 169 transitions. [2024-11-14 04:19:08,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2024-11-14 04:19:08,426 INFO L78 Accepts]: Start accepts. Automaton has has 163 states, 163 states have (on average 1.030674846625767) internal successors, (168), 163 states have internal predecessors, (168), 0 states have call successors, (0), 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 68 [2024-11-14 04:19:08,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:19:08,427 INFO L225 Difference]: With dead ends: 138 [2024-11-14 04:19:08,427 INFO L226 Difference]: Without dead ends: 100 [2024-11-14 04:19:08,429 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 97 SyntacticMatches, 2 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11164 ImplicationChecksByTransitivity, 30.2s TimeCoverageRelationStatistics Valid=958, Invalid=41684, Unknown=0, NotChecked=0, Total=42642 [2024-11-14 04:19:08,429 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 41 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 8027 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 288 SdHoareTripleChecker+Invalid, 8149 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 8027 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.9s IncrementalHoareTripleChecker+Time [2024-11-14 04:19:08,429 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 288 Invalid, 8149 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 8027 Invalid, 0 Unknown, 0 Unchecked, 5.9s Time] [2024-11-14 04:19:08,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2024-11-14 04:19:08,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2024-11-14 04:19:08,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 99 states have (on average 1.303030303030303) internal successors, (129), 99 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:19:08,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 129 transitions. [2024-11-14 04:19:08,721 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 129 transitions. Word has length 68 [2024-11-14 04:19:08,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:19:08,721 INFO L471 AbstractCegarLoop]: Abstraction has 100 states and 129 transitions. [2024-11-14 04:19:08,721 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 163 states, 163 states have (on average 1.030674846625767) internal successors, (168), 163 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:19:08,721 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 129 transitions. [2024-11-14 04:19:08,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2024-11-14 04:19:08,722 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:19:08,722 INFO L215 NwaCegarLoop]: trace histogram [30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:19:08,739 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Ended with exit code 0 [2024-11-14 04:19:08,922 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:19:08,922 INFO L396 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:19:08,923 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:19:08,923 INFO L85 PathProgramCache]: Analyzing trace with hash -687246513, now seen corresponding path program 50 times [2024-11-14 04:19:08,923 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:19:08,923 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [604748875] [2024-11-14 04:19:08,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:19:08,923 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:19:08,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:19:12,696 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 406 proven. 494 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:19:12,697 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:19:12,697 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [604748875] [2024-11-14 04:19:12,697 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [604748875] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:19:12,697 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1276803021] [2024-11-14 04:19:12,697 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 04:19:12,697 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:19:12,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:19:12,699 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:19:12,700 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2024-11-14 04:19:12,805 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2024-11-14 04:19:12,806 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:19:12,808 INFO L255 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 65 conjuncts are in the unsatisfiable core [2024-11-14 04:19:12,810 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:19:17,003 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 435 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:19:17,004 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:19:21,156 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 465 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:19:21,156 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1276803021] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:19:21,156 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1165324593] [2024-11-14 04:19:21,157 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:19:21,158 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:19:21,158 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:19:21,158 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:19:21,158 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:19:21,310 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:19:22,861 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29597#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_main_~is_divisible1~0#1_147| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_279| Int) (|v_ULTIMATE.start_student_version_~w#1_222| Int) (|v_ULTIMATE.start_student_version_~i~1#1_1931| Int)) (and (or (and (= |v_ULTIMATE.start_student_version_~i~1#1_1931| |v_ULTIMATE.start_student_version_~w#1_222|) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_279| 1)) (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_1931| |v_ULTIMATE.start_student_version_~w#1_222|)) (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_279| 0))) (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_147| 2147483647) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_147| 2147483648)) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_279| |v_ULTIMATE.start_main_~is_divisible1~0#1_147|)) (<= |v_ULTIMATE.start_student_version_~w#1_222| |v_ULTIMATE.start_student_version_~i~1#1_1931|) (<= 4 |v_ULTIMATE.start_student_version_~w#1_222|))) (= ~true~0 1) (= ~false~0 0))' at error location [2024-11-14 04:19:22,861 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:19:22,861 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:19:22,861 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 65, 65] total 159 [2024-11-14 04:19:22,861 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222164183] [2024-11-14 04:19:22,861 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:19:22,862 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 159 states [2024-11-14 04:19:22,862 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:19:22,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 159 interpolants. [2024-11-14 04:19:22,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4664, Invalid=23392, Unknown=0, NotChecked=0, Total=28056 [2024-11-14 04:19:22,865 INFO L87 Difference]: Start difference. First operand 100 states and 129 transitions. Second operand has 159 states, 159 states have (on average 1.050314465408805) internal successors, (167), 159 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) [2024-11-14 04:19:23,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:19:23,794 INFO L93 Difference]: Finished difference Result 134 states and 164 transitions. [2024-11-14 04:19:23,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2024-11-14 04:19:23,795 INFO L78 Accepts]: Start accepts. Automaton has has 159 states, 159 states have (on average 1.050314465408805) internal successors, (167), 159 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 69 [2024-11-14 04:19:23,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:19:23,795 INFO L225 Difference]: With dead ends: 134 [2024-11-14 04:19:23,795 INFO L226 Difference]: Without dead ends: 130 [2024-11-14 04:19:23,796 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 75 SyntacticMatches, 30 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20487 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=4760, Invalid=23632, Unknown=0, NotChecked=0, Total=28392 [2024-11-14 04:19:23,797 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 656 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 656 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 656 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-11-14 04:19:23,797 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 38 Invalid, 656 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 656 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-11-14 04:19:23,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2024-11-14 04:19:23,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 71. [2024-11-14 04:19:23,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 70 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:19:23,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2024-11-14 04:19:23,957 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 69 [2024-11-14 04:19:23,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:19:23,957 INFO L471 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2024-11-14 04:19:23,957 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 159 states, 159 states have (on average 1.050314465408805) internal successors, (167), 159 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) [2024-11-14 04:19:23,957 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2024-11-14 04:19:23,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2024-11-14 04:19:23,958 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:19:23,958 INFO L215 NwaCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:19:23,975 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2024-11-14 04:19:24,158 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:19:24,158 INFO L396 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:19:24,159 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:19:24,159 INFO L85 PathProgramCache]: Analyzing trace with hash 128893682, now seen corresponding path program 51 times [2024-11-14 04:19:24,159 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:19:24,159 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1115830605] [2024-11-14 04:19:24,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:19:24,159 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:19:24,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:19:29,505 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:19:29,505 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:19:29,505 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1115830605] [2024-11-14 04:19:29,505 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1115830605] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:19:29,505 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2026482280] [2024-11-14 04:19:29,505 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 04:19:29,505 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:19:29,505 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:19:29,511 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:19:29,514 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2024-11-14 04:19:29,620 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 04:19:29,620 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 04:19:29,627 WARN L253 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 146 conjuncts are in the unsatisfiable core [2024-11-14 04:19:29,631 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 04:19:44,217 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:19:44,217 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 04:20:02,322 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:20:02,322 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2026482280] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 04:20:02,322 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [96707613] [2024-11-14 04:20:02,323 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-14 04:20:02,323 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 04:20:02,323 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 04:20:02,323 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 04:20:02,323 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 04:20:02,479 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 04:20:05,874 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30609#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_student_version_~w#1_226| Int) (|v_ULTIMATE.start_student_version_~i~1#1_1998| Int) (|v_ULTIMATE.start_main_~is_divisible1~0#1_150| Int) (|v_ULTIMATE.start_student_version_~is_divisible~1#1_285| Int)) (and (<= |v_ULTIMATE.start_main_~is_divisible1~0#1_150| 2147483647) (<= |v_ULTIMATE.start_student_version_~w#1_226| |v_ULTIMATE.start_student_version_~i~1#1_1998|) (<= 4 |v_ULTIMATE.start_student_version_~w#1_226|) (or (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_285| 0) (not (= |v_ULTIMATE.start_student_version_~i~1#1_1998| |v_ULTIMATE.start_student_version_~w#1_226|))) (and (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_285| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_1998| |v_ULTIMATE.start_student_version_~w#1_226|))) (<= 0 (+ |v_ULTIMATE.start_main_~is_divisible1~0#1_150| 2147483648)) (not (= |v_ULTIMATE.start_student_version_~is_divisible~1#1_285| |v_ULTIMATE.start_main_~is_divisible1~0#1_150|)))) (= ~true~0 1) (= ~false~0 0))' at error location [2024-11-14 04:20:05,874 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 04:20:05,874 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 04:20:05,874 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 201 [2024-11-14 04:20:05,874 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150798046] [2024-11-14 04:20:05,875 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 04:20:05,875 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 201 states [2024-11-14 04:20:05,875 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 04:20:05,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 201 interpolants. [2024-11-14 04:20:05,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=953, Invalid=42937, Unknown=0, NotChecked=0, Total=43890 [2024-11-14 04:20:05,878 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand has 201 states, 201 states have (on average 1.0199004975124377) internal successors, (205), 201 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) [2024-11-14 04:20:43,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 04:20:43,613 INFO L93 Difference]: Finished difference Result 178 states and 214 transitions. [2024-11-14 04:20:43,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 138 states. [2024-11-14 04:20:43,614 INFO L78 Accepts]: Start accepts. Automaton has has 201 states, 201 states have (on average 1.0199004975124377) internal successors, (205), 201 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) Word has length 70 [2024-11-14 04:20:43,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 04:20:43,615 INFO L225 Difference]: With dead ends: 178 [2024-11-14 04:20:43,615 INFO L226 Difference]: Without dead ends: 138 [2024-11-14 04:20:43,617 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 351 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 282 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23855 ImplicationChecksByTransitivity, 65.6s TimeCoverageRelationStatistics Valid=2609, Invalid=77763, Unknown=0, NotChecked=0, Total=80372 [2024-11-14 04:20:43,618 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 178 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 7263 mSolverCounterSat, 1001 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 228 SdHoareTripleChecker+Invalid, 8264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1001 IncrementalHoareTripleChecker+Valid, 7263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.4s IncrementalHoareTripleChecker+Time [2024-11-14 04:20:43,618 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [178 Valid, 228 Invalid, 8264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1001 Valid, 7263 Invalid, 0 Unknown, 0 Unchecked, 7.4s Time] [2024-11-14 04:20:43,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2024-11-14 04:20:43,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 106. [2024-11-14 04:20:43,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 105 states have (on average 1.3142857142857143) internal successors, (138), 105 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 04:20:43,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 138 transitions. [2024-11-14 04:20:43,995 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 138 transitions. Word has length 70 [2024-11-14 04:20:43,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 04:20:43,995 INFO L471 AbstractCegarLoop]: Abstraction has 106 states and 138 transitions. [2024-11-14 04:20:43,995 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 201 states, 201 states have (on average 1.0199004975124377) internal successors, (205), 201 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) [2024-11-14 04:20:43,995 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 138 transitions. [2024-11-14 04:20:43,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2024-11-14 04:20:43,996 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 04:20:43,996 INFO L215 NwaCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 04:20:44,011 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Ended with exit code 0 [2024-11-14 04:20:44,196 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2024-11-14 04:20:44,196 INFO L396 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 04:20:44,197 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 04:20:44,197 INFO L85 PathProgramCache]: Analyzing trace with hash 1640954107, now seen corresponding path program 52 times [2024-11-14 04:20:44,197 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 04:20:44,197 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [838146163] [2024-11-14 04:20:44,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 04:20:44,197 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 04:20:44,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:20:49,726 INFO L134 CoverageAnalysis]: Checked inductivity of 992 backedges. 0 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 04:20:49,726 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 04:20:49,726 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [838146163] [2024-11-14 04:20:49,727 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [838146163] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 04:20:49,727 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1321598261] [2024-11-14 04:20:49,727 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 04:20:49,727 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 04:20:49,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 04:20:49,729 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 04:20:49,730 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32b41d31-0823-4905-baa8-60a873104183/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2024-11-14 04:20:49,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 04:20:49,812 WARN L253 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 144 conjuncts are in the unsatisfiable core [2024-11-14 04:20:49,814 INFO L278 TraceCheckSpWp]: Computing forward predicates...