./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound50.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_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/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_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/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_420990a8-bbaa-4181-b6e0-1dd1ca628112/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 5506d4c7458a400c41a33af3f6404f1e04b9f2e97e99f1fb53b74acf6bf59baf --- Real Ultimate output --- This is Ultimate 0.3.0-dev-826ab2b [2024-11-14 05:05:20,068 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-14 05:05:20,155 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/config/svcomp-Reach-32bit-Taipan_Default.epf [2024-11-14 05:05:20,160 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-14 05:05:20,161 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-14 05:05:20,210 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-14 05:05:20,211 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-14 05:05:20,211 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-14 05:05:20,211 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-14 05:05:20,212 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-14 05:05:20,212 INFO L153 SettingsManager]: * User list type=DISABLED [2024-11-14 05:05:20,212 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2024-11-14 05:05:20,212 INFO L153 SettingsManager]: * Explicit value domain=true [2024-11-14 05:05:20,212 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2024-11-14 05:05:20,212 INFO L153 SettingsManager]: * Octagon Domain=false [2024-11-14 05:05:20,212 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2024-11-14 05:05:20,212 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2024-11-14 05:05:20,212 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2024-11-14 05:05:20,213 INFO L153 SettingsManager]: * Interval Domain=false [2024-11-14 05:05:20,213 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2024-11-14 05:05:20,213 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2024-11-14 05:05:20,213 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2024-11-14 05:05:20,217 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-14 05:05:20,217 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-14 05:05:20,217 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-14 05:05:20,217 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-14 05:05:20,217 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-14 05:05:20,218 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-14 05:05:20,218 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-14 05:05:20,218 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-14 05:05:20,218 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-14 05:05:20,218 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-14 05:05:20,218 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-14 05:05:20,218 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-14 05:05:20,219 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-14 05:05:20,219 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-14 05:05:20,219 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-14 05:05:20,219 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-14 05:05:20,219 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-14 05:05:20,220 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-14 05:05:20,221 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-14 05:05:20,221 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-14 05:05:20,221 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2024-11-14 05:05:20,221 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-14 05:05:20,221 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-14 05:05:20,221 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2024-11-14 05:05:20,222 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-14 05:05:20,222 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_420990a8-bbaa-4181-b6e0-1dd1ca628112/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 -> 5506d4c7458a400c41a33af3f6404f1e04b9f2e97e99f1fb53b74acf6bf59baf [2024-11-14 05:05:20,609 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-14 05:05:20,619 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-14 05:05:20,622 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-14 05:05:20,624 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-14 05:05:20,624 INFO L274 PluginConnector]: CDTParser initialized [2024-11-14 05:05:20,626 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/../../sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound50.c Unable to find full path for "g++" [2024-11-14 05:05:22,630 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-14 05:05:22,870 INFO L384 CDTParser]: Found 1 translation units. [2024-11-14 05:05:22,871 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound50.c [2024-11-14 05:05:22,879 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/data/8759f9f11/0c4a7fe5d24e4ddf8cf0e0baab198297/FLAGc31a330d0 [2024-11-14 05:05:22,899 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/data/8759f9f11/0c4a7fe5d24e4ddf8cf0e0baab198297 [2024-11-14 05:05:22,901 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-14 05:05:22,902 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-14 05:05:22,903 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-14 05:05:22,904 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-14 05:05:22,907 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-14 05:05:22,908 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.11 05:05:22" (1/1) ... [2024-11-14 05:05:22,909 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7e18c013 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:05:22, skipping insertion in model container [2024-11-14 05:05:22,909 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.11 05:05:22" (1/1) ... [2024-11-14 05:05:22,925 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-14 05:05:23,086 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_420990a8-bbaa-4181-b6e0-1dd1ca628112/sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound50.c[526,539] [2024-11-14 05:05:23,116 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-14 05:05:23,132 INFO L200 MainTranslator]: Completed pre-run [2024-11-14 05:05:23,149 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_420990a8-bbaa-4181-b6e0-1dd1ca628112/sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound50.c[526,539] [2024-11-14 05:05:23,161 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-14 05:05:23,180 INFO L204 MainTranslator]: Completed translation [2024-11-14 05:05:23,181 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:05:23 WrapperNode [2024-11-14 05:05:23,181 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-14 05:05:23,182 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-14 05:05:23,183 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-14 05:05:23,183 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-14 05:05:23,188 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:05:23" (1/1) ... [2024-11-14 05:05:23,193 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:05:23" (1/1) ... [2024-11-14 05:05:23,208 INFO L138 Inliner]: procedures = 14, calls = 22, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 67 [2024-11-14 05:05:23,209 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-14 05:05:23,209 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-14 05:05:23,209 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-14 05:05:23,210 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-14 05:05:23,218 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:05:23" (1/1) ... [2024-11-14 05:05:23,218 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:05:23" (1/1) ... [2024-11-14 05:05:23,219 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:05:23" (1/1) ... [2024-11-14 05:05:23,220 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:05:23" (1/1) ... [2024-11-14 05:05:23,223 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:05:23" (1/1) ... [2024-11-14 05:05:23,227 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:05:23" (1/1) ... [2024-11-14 05:05:23,228 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:05:23" (1/1) ... [2024-11-14 05:05:23,229 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:05:23" (1/1) ... [2024-11-14 05:05:23,230 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-14 05:05:23,231 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-14 05:05:23,231 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-14 05:05:23,232 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-14 05:05:23,233 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:05:23" (1/1) ... [2024-11-14 05:05:23,239 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-14 05:05:23,252 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:05:23,265 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2024-11-14 05:05:23,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2024-11-14 05:05:23,290 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-14 05:05:23,290 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-11-14 05:05:23,290 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-14 05:05:23,290 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-14 05:05:23,290 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2024-11-14 05:05:23,290 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2024-11-14 05:05:23,350 INFO L238 CfgBuilder]: Building ICFG [2024-11-14 05:05:23,352 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-14 05:05:23,534 INFO L? ?]: Removed 5 outVars from TransFormulas that were not future-live. [2024-11-14 05:05:23,534 INFO L287 CfgBuilder]: Performing block encoding [2024-11-14 05:05:23,579 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-14 05:05:23,579 INFO L316 CfgBuilder]: Removed 2 assume(true) statements. [2024-11-14 05:05:23,580 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.11 05:05:23 BoogieIcfgContainer [2024-11-14 05:05:23,580 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-14 05:05:23,584 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-14 05:05:23,584 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-14 05:05:23,589 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-14 05:05:23,590 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.11 05:05:22" (1/3) ... [2024-11-14 05:05:23,591 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54a6af55 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.11 05:05:23, skipping insertion in model container [2024-11-14 05:05:23,591 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:05:23" (2/3) ... [2024-11-14 05:05:23,591 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54a6af55 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.11 05:05:23, skipping insertion in model container [2024-11-14 05:05:23,591 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.11 05:05:23" (3/3) ... [2024-11-14 05:05:23,593 INFO L112 eAbstractionObserver]: Analyzing ICFG hard2_unwindbound50.c [2024-11-14 05:05:23,612 INFO L217 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-14 05:05:23,613 INFO L154 ceAbstractionStarter]: Applying trace abstraction to ICFG hard2_unwindbound50.c that has 2 procedures, 22 locations, 1 initial locations, 2 loop locations, and 1 error locations. [2024-11-14 05:05:23,685 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-14 05:05:23,706 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;@63dc0a9d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-14 05:05:23,707 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-11-14 05:05:23,711 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2024-11-14 05:05:23,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2024-11-14 05:05:23,720 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:05:23,720 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2024-11-14 05:05:23,721 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:05:23,726 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:05:23,726 INFO L85 PathProgramCache]: Analyzing trace with hash -513815021, now seen corresponding path program 1 times [2024-11-14 05:05:23,735 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:05:23,735 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [944596435] [2024-11-14 05:05:23,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:23,736 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:05:23,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:05:23,883 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 05:05:23,886 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:05:23,886 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [944596435] [2024-11-14 05:05:23,887 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [944596435] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 05:05:23,887 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 05:05:23,887 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-11-14 05:05:23,889 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245427718] [2024-11-14 05:05:23,892 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 05:05:23,897 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2024-11-14 05:05:23,898 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:05:23,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2024-11-14 05:05:23,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2024-11-14 05:05:23,922 INFO L87 Difference]: Start difference. First operand has 22 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 05:05:23,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:05:23,953 INFO L93 Difference]: Finished difference Result 43 states and 74 transitions. [2024-11-14 05:05:23,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2024-11-14 05:05:23,956 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2024-11-14 05:05:23,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:05:23,966 INFO L225 Difference]: With dead ends: 43 [2024-11-14 05:05:23,967 INFO L226 Difference]: Without dead ends: 20 [2024-11-14 05:05:23,970 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2024-11-14 05:05:23,973 INFO L432 NwaCegarLoop]: 28 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-14 05:05:23,974 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-14 05:05:23,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2024-11-14 05:05:24,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2024-11-14 05:05:24,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2024-11-14 05:05:24,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 29 transitions. [2024-11-14 05:05:24,008 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 29 transitions. Word has length 7 [2024-11-14 05:05:24,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:05:24,008 INFO L471 AbstractCegarLoop]: Abstraction has 20 states and 29 transitions. [2024-11-14 05:05:24,009 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 05:05:24,009 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 29 transitions. [2024-11-14 05:05:24,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2024-11-14 05:05:24,009 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:05:24,009 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2024-11-14 05:05:24,010 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-14 05:05:24,010 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:05:24,011 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:05:24,011 INFO L85 PathProgramCache]: Analyzing trace with hash -974949910, now seen corresponding path program 1 times [2024-11-14 05:05:24,011 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:05:24,011 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [412893848] [2024-11-14 05:05:24,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:24,011 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:05:24,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:05:24,178 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 05:05:24,178 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:05:24,179 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [412893848] [2024-11-14 05:05:24,179 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [412893848] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 05:05:24,179 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 05:05:24,179 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2024-11-14 05:05:24,179 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759025170] [2024-11-14 05:05:24,179 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 05:05:24,181 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-14 05:05:24,182 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:05:24,183 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-14 05:05:24,184 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-14 05:05:24,184 INFO L87 Difference]: Start difference. First operand 20 states and 29 transitions. Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 05:05:24,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:05:24,257 INFO L93 Difference]: Finished difference Result 33 states and 46 transitions. [2024-11-14 05:05:24,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-14 05:05:24,258 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2024-11-14 05:05:24,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:05:24,259 INFO L225 Difference]: With dead ends: 33 [2024-11-14 05:05:24,259 INFO L226 Difference]: Without dead ends: 31 [2024-11-14 05:05:24,260 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-11-14 05:05:24,260 INFO L432 NwaCegarLoop]: 24 mSDtfsCounter, 10 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-14 05:05:24,261 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 82 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-14 05:05:24,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2024-11-14 05:05:24,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 24. [2024-11-14 05:05:24,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 15 states have internal predecessors, (19), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2024-11-14 05:05:24,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2024-11-14 05:05:24,270 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 7 [2024-11-14 05:05:24,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:05:24,270 INFO L471 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2024-11-14 05:05:24,271 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 05:05:24,271 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2024-11-14 05:05:24,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2024-11-14 05:05:24,272 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:05:24,272 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 05:05:24,272 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2024-11-14 05:05:24,272 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:05:24,273 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:05:24,273 INFO L85 PathProgramCache]: Analyzing trace with hash 756875265, now seen corresponding path program 1 times [2024-11-14 05:05:24,273 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:05:24,273 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1674171201] [2024-11-14 05:05:24,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:24,273 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:05:24,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:05:24,411 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 05:05:24,411 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:05:24,412 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1674171201] [2024-11-14 05:05:24,412 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1674171201] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 05:05:24,412 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 05:05:24,412 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2024-11-14 05:05:24,412 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630464009] [2024-11-14 05:05:24,412 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 05:05:24,412 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2024-11-14 05:05:24,412 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:05:24,413 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2024-11-14 05:05:24,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2024-11-14 05:05:24,413 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 05:05:24,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:05:24,455 INFO L93 Difference]: Finished difference Result 39 states and 52 transitions. [2024-11-14 05:05:24,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-11-14 05:05:24,455 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2024-11-14 05:05:24,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:05:24,456 INFO L225 Difference]: With dead ends: 39 [2024-11-14 05:05:24,456 INFO L226 Difference]: Without dead ends: 26 [2024-11-14 05:05:24,457 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2024-11-14 05:05:24,457 INFO L432 NwaCegarLoop]: 25 mSDtfsCounter, 0 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 73 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 05:05:24,458 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 73 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-14 05:05:24,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2024-11-14 05:05:24,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2024-11-14 05:05:24,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.3125) internal successors, (21), 17 states have internal predecessors, (21), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2024-11-14 05:05:24,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2024-11-14 05:05:24,470 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 9 [2024-11-14 05:05:24,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:05:24,473 INFO L471 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2024-11-14 05:05:24,474 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 05:05:24,474 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2024-11-14 05:05:24,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2024-11-14 05:05:24,474 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:05:24,475 INFO L215 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 05:05:24,475 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2024-11-14 05:05:24,475 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:05:24,476 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:05:24,479 INFO L85 PathProgramCache]: Analyzing trace with hash -408725012, now seen corresponding path program 1 times [2024-11-14 05:05:24,480 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:05:24,480 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [467960558] [2024-11-14 05:05:24,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:24,480 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:05:24,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:05:24,634 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 05:05:24,634 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:05:24,634 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [467960558] [2024-11-14 05:05:24,635 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [467960558] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 05:05:24,635 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 05:05:24,635 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-11-14 05:05:24,635 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [449654915] [2024-11-14 05:05:24,635 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 05:05:24,635 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-14 05:05:24,636 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:05:24,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-14 05:05:24,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-14 05:05:24,637 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2024-11-14 05:05:24,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:05:24,728 INFO L93 Difference]: Finished difference Result 39 states and 51 transitions. [2024-11-14 05:05:24,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-14 05:05:24,729 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2024-11-14 05:05:24,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:05:24,730 INFO L225 Difference]: With dead ends: 39 [2024-11-14 05:05:24,730 INFO L226 Difference]: Without dead ends: 37 [2024-11-14 05:05:24,731 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-11-14 05:05:24,731 INFO L432 NwaCegarLoop]: 25 mSDtfsCounter, 10 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 05:05:24,732 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 83 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 05:05:24,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2024-11-14 05:05:24,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2024-11-14 05:05:24,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 19 states have (on average 1.263157894736842) internal successors, (24), 20 states have internal predecessors, (24), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2024-11-14 05:05:24,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2024-11-14 05:05:24,739 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 12 [2024-11-14 05:05:24,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:05:24,740 INFO L471 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2024-11-14 05:05:24,740 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2024-11-14 05:05:24,740 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2024-11-14 05:05:24,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2024-11-14 05:05:24,740 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:05:24,740 INFO L215 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 05:05:24,741 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2024-11-14 05:05:24,741 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:05:24,741 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:05:24,741 INFO L85 PathProgramCache]: Analyzing trace with hash -316982550, now seen corresponding path program 1 times [2024-11-14 05:05:24,741 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:05:24,741 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1586369036] [2024-11-14 05:05:24,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:24,742 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:05:24,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 05:05:24,765 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1784061343] [2024-11-14 05:05:24,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:24,765 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:05:24,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:05:24,771 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:05:24,773 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-11-14 05:05:24,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:05:24,836 INFO L255 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 9 conjuncts are in the unsatisfiable core [2024-11-14 05:05:24,841 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:05:24,963 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-11-14 05:05:24,964 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-14 05:05:24,964 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:05:24,964 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1586369036] [2024-11-14 05:05:24,965 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 05:05:24,965 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1784061343] [2024-11-14 05:05:24,965 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1784061343] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 05:05:24,965 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 05:05:24,965 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-11-14 05:05:24,965 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [105286680] [2024-11-14 05:05:24,965 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 05:05:24,966 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-14 05:05:24,966 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:05:24,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-14 05:05:24,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-14 05:05:24,967 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2024-11-14 05:05:25,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:05:25,063 INFO L93 Difference]: Finished difference Result 58 states and 78 transitions. [2024-11-14 05:05:25,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-14 05:05:25,063 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2024-11-14 05:05:25,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:05:25,066 INFO L225 Difference]: With dead ends: 58 [2024-11-14 05:05:25,066 INFO L226 Difference]: Without dead ends: 44 [2024-11-14 05:05:25,067 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-11-14 05:05:25,068 INFO L432 NwaCegarLoop]: 23 mSDtfsCounter, 7 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 05:05:25,068 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 82 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 05:05:25,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2024-11-14 05:05:25,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2024-11-14 05:05:25,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 28 states have internal predecessors, (33), 13 states have call successors, (13), 4 states have call predecessors, (13), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2024-11-14 05:05:25,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 57 transitions. [2024-11-14 05:05:25,092 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 57 transitions. Word has length 17 [2024-11-14 05:05:25,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:05:25,092 INFO L471 AbstractCegarLoop]: Abstraction has 44 states and 57 transitions. [2024-11-14 05:05:25,092 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2024-11-14 05:05:25,092 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 57 transitions. [2024-11-14 05:05:25,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2024-11-14 05:05:25,093 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:05:25,093 INFO L215 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 05:05:25,116 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2024-11-14 05:05:25,293 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:05:25,294 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:05:25,295 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:05:25,295 INFO L85 PathProgramCache]: Analyzing trace with hash 65356806, now seen corresponding path program 1 times [2024-11-14 05:05:25,295 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:05:25,295 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165637013] [2024-11-14 05:05:25,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:25,295 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:05:25,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:05:25,488 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-11-14 05:05:25,489 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:05:25,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165637013] [2024-11-14 05:05:25,489 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1165637013] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 05:05:25,489 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 05:05:25,489 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2024-11-14 05:05:25,489 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2119951188] [2024-11-14 05:05:25,489 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 05:05:25,489 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2024-11-14 05:05:25,490 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:05:25,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2024-11-14 05:05:25,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-11-14 05:05:25,490 INFO L87 Difference]: Start difference. First operand 44 states and 57 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2024-11-14 05:05:25,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:05:25,577 INFO L93 Difference]: Finished difference Result 63 states and 72 transitions. [2024-11-14 05:05:25,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2024-11-14 05:05:25,578 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 25 [2024-11-14 05:05:25,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:05:25,579 INFO L225 Difference]: With dead ends: 63 [2024-11-14 05:05:25,579 INFO L226 Difference]: Without dead ends: 56 [2024-11-14 05:05:25,579 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-11-14 05:05:25,580 INFO L432 NwaCegarLoop]: 23 mSDtfsCounter, 7 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 05:05:25,580 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 102 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 05:05:25,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2024-11-14 05:05:25,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2024-11-14 05:05:25,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 36 states have internal predecessors, (41), 12 states have call successors, (12), 7 states have call predecessors, (12), 7 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2024-11-14 05:05:25,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2024-11-14 05:05:25,603 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 25 [2024-11-14 05:05:25,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:05:25,603 INFO L471 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2024-11-14 05:05:25,603 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2024-11-14 05:05:25,603 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2024-11-14 05:05:25,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2024-11-14 05:05:25,604 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:05:25,604 INFO L215 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 05:05:25,604 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2024-11-14 05:05:25,604 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:05:25,604 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:05:25,605 INFO L85 PathProgramCache]: Analyzing trace with hash 67084684, now seen corresponding path program 1 times [2024-11-14 05:05:25,605 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:05:25,605 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [107698226] [2024-11-14 05:05:25,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:25,605 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:05:25,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 05:05:25,625 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1051106565] [2024-11-14 05:05:25,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:25,625 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:05:25,625 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:05:25,631 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:05:25,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-11-14 05:05:25,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:05:25,703 INFO L255 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 15 conjuncts are in the unsatisfiable core [2024-11-14 05:05:25,704 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:05:25,876 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-14 05:05:25,877 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:05:26,148 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-14 05:05:26,149 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:05:26,149 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [107698226] [2024-11-14 05:05:26,149 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 05:05:26,149 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1051106565] [2024-11-14 05:05:26,149 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1051106565] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:05:26,149 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1704506941] [2024-11-14 05:05:26,172 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2024-11-14 05:05:26,172 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:05:26,177 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 05:05:26,183 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 05:05:26,183 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 05:05:27,256 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 10 for LOIs [2024-11-14 05:05:27,264 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 05:05:28,594 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1704506941] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 05:05:28,594 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2024-11-14 05:05:28,595 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [7, 7] total 18 [2024-11-14 05:05:28,595 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1356089203] [2024-11-14 05:05:28,595 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 05:05:28,596 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2024-11-14 05:05:28,596 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:05:28,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2024-11-14 05:05:28,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2024-11-14 05:05:28,597 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2024-11-14 05:05:28,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:05:28,878 INFO L93 Difference]: Finished difference Result 61 states and 69 transitions. [2024-11-14 05:05:28,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2024-11-14 05:05:28,878 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 25 [2024-11-14 05:05:28,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:05:28,879 INFO L225 Difference]: With dead ends: 61 [2024-11-14 05:05:28,879 INFO L226 Difference]: Without dead ends: 59 [2024-11-14 05:05:28,880 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 53 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2024-11-14 05:05:28,881 INFO L432 NwaCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 145 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 145 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-14 05:05:28,881 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 67 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 145 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-14 05:05:28,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2024-11-14 05:05:28,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2024-11-14 05:05:28,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 38 states have (on average 1.1578947368421053) internal successors, (44), 39 states have internal predecessors, (44), 12 states have call successors, (12), 8 states have call predecessors, (12), 8 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2024-11-14 05:05:28,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 67 transitions. [2024-11-14 05:05:28,896 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 67 transitions. Word has length 25 [2024-11-14 05:05:28,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:05:28,896 INFO L471 AbstractCegarLoop]: Abstraction has 59 states and 67 transitions. [2024-11-14 05:05:28,896 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2024-11-14 05:05:28,896 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 67 transitions. [2024-11-14 05:05:28,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2024-11-14 05:05:28,897 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:05:28,897 INFO L215 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 05:05:28,919 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2024-11-14 05:05:29,102 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2024-11-14 05:05:29,102 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:05:29,102 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:05:29,102 INFO L85 PathProgramCache]: Analyzing trace with hash -798302453, now seen corresponding path program 1 times [2024-11-14 05:05:29,102 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:05:29,103 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1271581325] [2024-11-14 05:05:29,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:29,103 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:05:29,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:05:29,209 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-11-14 05:05:29,209 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:05:29,209 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1271581325] [2024-11-14 05:05:29,210 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1271581325] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:05:29,210 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087887062] [2024-11-14 05:05:29,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:29,210 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:05:29,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:05:29,213 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:05:29,216 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-11-14 05:05:29,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:05:29,280 INFO L255 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 5 conjuncts are in the unsatisfiable core [2024-11-14 05:05:29,282 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:05:29,346 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-11-14 05:05:29,346 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:05:29,417 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-11-14 05:05:29,417 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1087887062] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:05:29,417 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [244902182] [2024-11-14 05:05:29,419 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2024-11-14 05:05:29,419 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:05:29,420 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 05:05:29,420 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 05:05:29,420 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 05:05:31,216 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 10 for LOIs [2024-11-14 05:05:31,228 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 05:05:32,701 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1352#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-14 05:05:32,701 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 05:05:32,701 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:05:32,702 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4, 5] total 10 [2024-11-14 05:05:32,702 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1799248790] [2024-11-14 05:05:32,702 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:05:32,702 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2024-11-14 05:05:32,703 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:05:32,703 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2024-11-14 05:05:32,703 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=374, Unknown=0, NotChecked=0, Total=462 [2024-11-14 05:05:32,704 INFO L87 Difference]: Start difference. First operand 59 states and 67 transitions. Second operand has 10 states, 10 states have (on average 2.6) internal successors, (26), 10 states have internal predecessors, (26), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2024-11-14 05:05:32,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:05:32,907 INFO L93 Difference]: Finished difference Result 124 states and 147 transitions. [2024-11-14 05:05:32,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2024-11-14 05:05:32,908 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.6) internal successors, (26), 10 states have internal predecessors, (26), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) Word has length 27 [2024-11-14 05:05:32,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:05:32,909 INFO L225 Difference]: With dead ends: 124 [2024-11-14 05:05:32,910 INFO L226 Difference]: Without dead ends: 111 [2024-11-14 05:05:32,910 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=101, Invalid=451, Unknown=0, NotChecked=0, Total=552 [2024-11-14 05:05:32,911 INFO L432 NwaCegarLoop]: 24 mSDtfsCounter, 52 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 05:05:32,912 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 112 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 05:05:32,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2024-11-14 05:05:32,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 106. [2024-11-14 05:05:32,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 67 states have (on average 1.1791044776119404) internal successors, (79), 70 states have internal predecessors, (79), 24 states have call successors, (24), 14 states have call predecessors, (24), 14 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2024-11-14 05:05:32,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 124 transitions. [2024-11-14 05:05:32,932 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 124 transitions. Word has length 27 [2024-11-14 05:05:32,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:05:32,932 INFO L471 AbstractCegarLoop]: Abstraction has 106 states and 124 transitions. [2024-11-14 05:05:32,933 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.6) internal successors, (26), 10 states have internal predecessors, (26), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2024-11-14 05:05:32,933 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 124 transitions. [2024-11-14 05:05:32,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2024-11-14 05:05:32,934 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:05:32,934 INFO L215 NwaCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2024-11-14 05:05:32,955 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2024-11-14 05:05:33,138 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2024-11-14 05:05:33,138 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:05:33,139 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:05:33,139 INFO L85 PathProgramCache]: Analyzing trace with hash 1522954228, now seen corresponding path program 1 times [2024-11-14 05:05:33,139 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:05:33,139 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [33678748] [2024-11-14 05:05:33,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:33,139 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:05:33,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 05:05:33,170 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1043133569] [2024-11-14 05:05:33,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:33,171 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:05:33,171 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:05:33,173 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:05:33,176 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-11-14 05:05:33,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:05:33,237 INFO L255 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 13 conjuncts are in the unsatisfiable core [2024-11-14 05:05:33,239 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:05:33,340 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2024-11-14 05:05:33,340 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:05:33,427 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2024-11-14 05:05:33,428 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:05:33,428 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [33678748] [2024-11-14 05:05:33,428 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 05:05:33,428 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1043133569] [2024-11-14 05:05:33,428 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1043133569] provided 1 perfect and 1 imperfect interpolant sequences [2024-11-14 05:05:33,428 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2024-11-14 05:05:33,428 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2024-11-14 05:05:33,428 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726642905] [2024-11-14 05:05:33,428 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 05:05:33,429 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-14 05:05:33,429 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:05:33,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-14 05:05:33,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2024-11-14 05:05:33,430 INFO L87 Difference]: Start difference. First operand 106 states and 124 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2024-11-14 05:05:34,829 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.33s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2024-11-14 05:05:34,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:05:34,841 INFO L93 Difference]: Finished difference Result 129 states and 152 transitions. [2024-11-14 05:05:34,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-14 05:05:34,842 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 35 [2024-11-14 05:05:34,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:05:34,843 INFO L225 Difference]: With dead ends: 129 [2024-11-14 05:05:34,843 INFO L226 Difference]: Without dead ends: 127 [2024-11-14 05:05:34,844 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2024-11-14 05:05:34,844 INFO L432 NwaCegarLoop]: 26 mSDtfsCounter, 8 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2024-11-14 05:05:34,845 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 85 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2024-11-14 05:05:34,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2024-11-14 05:05:34,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 122. [2024-11-14 05:05:34,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 78 states have (on average 1.1666666666666667) internal successors, (91), 82 states have internal predecessors, (91), 26 states have call successors, (26), 17 states have call predecessors, (26), 17 states have return successors, (23), 22 states have call predecessors, (23), 23 states have call successors, (23) [2024-11-14 05:05:34,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 140 transitions. [2024-11-14 05:05:34,867 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 140 transitions. Word has length 35 [2024-11-14 05:05:34,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:05:34,867 INFO L471 AbstractCegarLoop]: Abstraction has 122 states and 140 transitions. [2024-11-14 05:05:34,867 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2024-11-14 05:05:34,867 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 140 transitions. [2024-11-14 05:05:34,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2024-11-14 05:05:34,868 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:05:34,868 INFO L215 NwaCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 05:05:34,888 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2024-11-14 05:05:35,069 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:05:35,069 INFO L396 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:05:35,069 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:05:35,070 INFO L85 PathProgramCache]: Analyzing trace with hash -1979605679, now seen corresponding path program 1 times [2024-11-14 05:05:35,070 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:05:35,070 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1664300695] [2024-11-14 05:05:35,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:35,070 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:05:35,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 05:05:35,082 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1595712736] [2024-11-14 05:05:35,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:35,083 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:05:35,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:05:35,085 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:05:35,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-11-14 05:05:35,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:05:35,142 INFO L255 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 15 conjuncts are in the unsatisfiable core [2024-11-14 05:05:35,143 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:05:35,237 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 9 proven. 13 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2024-11-14 05:05:35,237 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:05:35,370 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 9 proven. 13 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2024-11-14 05:05:35,370 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:05:35,370 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1664300695] [2024-11-14 05:05:35,370 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 05:05:35,371 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1595712736] [2024-11-14 05:05:35,371 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1595712736] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:05:35,371 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [28873428] [2024-11-14 05:05:35,373 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2024-11-14 05:05:35,373 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:05:35,373 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 05:05:35,374 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 05:05:35,374 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 05:05:35,961 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 10 for LOIs [2024-11-14 05:05:35,966 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 05:05:37,099 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [28873428] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 05:05:37,100 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2024-11-14 05:05:37,100 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [7, 7] total 19 [2024-11-14 05:05:37,100 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232671028] [2024-11-14 05:05:37,100 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 05:05:37,101 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2024-11-14 05:05:37,101 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:05:37,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2024-11-14 05:05:37,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2024-11-14 05:05:37,102 INFO L87 Difference]: Start difference. First operand 122 states and 140 transitions. Second operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2024-11-14 05:05:37,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:05:37,364 INFO L93 Difference]: Finished difference Result 124 states and 141 transitions. [2024-11-14 05:05:37,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2024-11-14 05:05:37,365 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 36 [2024-11-14 05:05:37,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:05:37,368 INFO L225 Difference]: With dead ends: 124 [2024-11-14 05:05:37,368 INFO L226 Difference]: Without dead ends: 103 [2024-11-14 05:05:37,368 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 83 SyntacticMatches, 6 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2024-11-14 05:05:37,369 INFO L432 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 166 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 05:05:37,369 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 52 Invalid, 167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 166 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 05:05:37,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2024-11-14 05:05:37,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2024-11-14 05:05:37,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 66 states have (on average 1.1666666666666667) internal successors, (77), 69 states have internal predecessors, (77), 22 states have call successors, (22), 14 states have call predecessors, (22), 14 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2024-11-14 05:05:37,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 119 transitions. [2024-11-14 05:05:37,386 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 119 transitions. Word has length 36 [2024-11-14 05:05:37,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:05:37,387 INFO L471 AbstractCegarLoop]: Abstraction has 103 states and 119 transitions. [2024-11-14 05:05:37,387 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2024-11-14 05:05:37,387 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 119 transitions. [2024-11-14 05:05:37,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2024-11-14 05:05:37,388 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:05:37,388 INFO L215 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 05:05:37,409 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2024-11-14 05:05:37,588 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:05:37,589 INFO L396 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:05:37,589 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:05:37,589 INFO L85 PathProgramCache]: Analyzing trace with hash -1942499568, now seen corresponding path program 1 times [2024-11-14 05:05:37,589 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:05:37,589 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1639011005] [2024-11-14 05:05:37,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:37,590 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:05:37,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:05:37,715 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2024-11-14 05:05:37,715 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:05:37,715 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1639011005] [2024-11-14 05:05:37,715 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1639011005] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:05:37,716 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [890174498] [2024-11-14 05:05:37,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:37,716 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:05:37,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:05:37,718 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:05:37,721 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2024-11-14 05:05:37,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:05:37,778 INFO L255 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 7 conjuncts are in the unsatisfiable core [2024-11-14 05:05:37,779 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:05:37,852 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 42 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2024-11-14 05:05:37,853 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:05:37,941 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2024-11-14 05:05:37,941 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [890174498] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:05:37,941 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1900547213] [2024-11-14 05:05:37,943 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2024-11-14 05:05:37,943 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:05:37,943 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 05:05:37,943 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 05:05:37,944 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 05:05:39,319 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 10 for LOIs [2024-11-14 05:05:39,335 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 05:05:40,464 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3179#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-14 05:05:40,465 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 05:05:40,465 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:05:40,465 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 6] total 12 [2024-11-14 05:05:40,465 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576698595] [2024-11-14 05:05:40,465 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:05:40,466 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2024-11-14 05:05:40,466 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:05:40,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2024-11-14 05:05:40,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=453, Unknown=0, NotChecked=0, Total=552 [2024-11-14 05:05:40,467 INFO L87 Difference]: Start difference. First operand 103 states and 119 transitions. Second operand has 12 states, 12 states have (on average 2.75) internal successors, (33), 12 states have internal predecessors, (33), 5 states have call successors, (19), 4 states have call predecessors, (19), 3 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) [2024-11-14 05:05:40,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:05:40,711 INFO L93 Difference]: Finished difference Result 192 states and 227 transitions. [2024-11-14 05:05:40,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2024-11-14 05:05:40,712 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.75) internal successors, (33), 12 states have internal predecessors, (33), 5 states have call successors, (19), 4 states have call predecessors, (19), 3 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) Word has length 43 [2024-11-14 05:05:40,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:05:40,713 INFO L225 Difference]: With dead ends: 192 [2024-11-14 05:05:40,713 INFO L226 Difference]: Without dead ends: 178 [2024-11-14 05:05:40,714 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=118, Invalid=584, Unknown=0, NotChecked=0, Total=702 [2024-11-14 05:05:40,715 INFO L432 NwaCegarLoop]: 23 mSDtfsCounter, 74 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 05:05:40,715 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 141 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 05:05:40,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2024-11-14 05:05:40,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 171. [2024-11-14 05:05:40,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 108 states have (on average 1.1574074074074074) internal successors, (125), 115 states have internal predecessors, (125), 40 states have call successors, (40), 22 states have call predecessors, (40), 22 states have return successors, (36), 33 states have call predecessors, (36), 36 states have call successors, (36) [2024-11-14 05:05:40,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 201 transitions. [2024-11-14 05:05:40,741 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 201 transitions. Word has length 43 [2024-11-14 05:05:40,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:05:40,742 INFO L471 AbstractCegarLoop]: Abstraction has 171 states and 201 transitions. [2024-11-14 05:05:40,742 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.75) internal successors, (33), 12 states have internal predecessors, (33), 5 states have call successors, (19), 4 states have call predecessors, (19), 3 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) [2024-11-14 05:05:40,742 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 201 transitions. [2024-11-14 05:05:40,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2024-11-14 05:05:40,743 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:05:40,743 INFO L215 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 05:05:40,765 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2024-11-14 05:05:40,948 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2024-11-14 05:05:40,948 INFO L396 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:05:40,948 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:05:40,948 INFO L85 PathProgramCache]: Analyzing trace with hash -1940771690, now seen corresponding path program 1 times [2024-11-14 05:05:40,948 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:05:40,948 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008337998] [2024-11-14 05:05:40,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:40,949 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:05:40,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 05:05:40,964 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [58201935] [2024-11-14 05:05:40,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:40,964 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:05:40,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:05:40,966 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:05:40,969 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2024-11-14 05:05:41,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:05:41,034 INFO L255 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 7 conjuncts are in the unsatisfiable core [2024-11-14 05:05:41,036 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:05:41,130 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2024-11-14 05:05:41,130 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-14 05:05:41,131 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:05:41,131 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1008337998] [2024-11-14 05:05:41,131 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 05:05:41,131 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [58201935] [2024-11-14 05:05:41,131 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [58201935] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 05:05:41,131 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 05:05:41,131 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-11-14 05:05:41,132 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698974609] [2024-11-14 05:05:41,132 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 05:05:41,133 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-14 05:05:41,133 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:05:41,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-14 05:05:41,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-14 05:05:41,134 INFO L87 Difference]: Start difference. First operand 171 states and 201 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2024-11-14 05:05:41,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:05:41,210 INFO L93 Difference]: Finished difference Result 198 states and 233 transitions. [2024-11-14 05:05:41,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-14 05:05:41,211 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 43 [2024-11-14 05:05:41,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:05:41,214 INFO L225 Difference]: With dead ends: 198 [2024-11-14 05:05:41,214 INFO L226 Difference]: Without dead ends: 194 [2024-11-14 05:05:41,214 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-11-14 05:05:41,215 INFO L432 NwaCegarLoop]: 20 mSDtfsCounter, 6 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 05:05:41,215 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 70 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 05:05:41,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2024-11-14 05:05:41,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 191. [2024-11-14 05:05:41,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 122 states have (on average 1.1557377049180328) internal successors, (141), 128 states have internal predecessors, (141), 43 states have call successors, (43), 26 states have call predecessors, (43), 25 states have return successors, (39), 36 states have call predecessors, (39), 39 states have call successors, (39) [2024-11-14 05:05:41,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 223 transitions. [2024-11-14 05:05:41,242 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 223 transitions. Word has length 43 [2024-11-14 05:05:41,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:05:41,242 INFO L471 AbstractCegarLoop]: Abstraction has 191 states and 223 transitions. [2024-11-14 05:05:41,243 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2024-11-14 05:05:41,243 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 223 transitions. [2024-11-14 05:05:41,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2024-11-14 05:05:41,246 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:05:41,246 INFO L215 NwaCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 05:05:41,263 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2024-11-14 05:05:41,446 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2024-11-14 05:05:41,447 INFO L396 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:05:41,447 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:05:41,447 INFO L85 PathProgramCache]: Analyzing trace with hash -1115004513, now seen corresponding path program 1 times [2024-11-14 05:05:41,447 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:05:41,447 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1253810321] [2024-11-14 05:05:41,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:41,447 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:05:41,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 05:05:41,475 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [585490952] [2024-11-14 05:05:41,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:41,475 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:05:41,475 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:05:41,478 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:05:41,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2024-11-14 05:05:41,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:05:41,545 INFO L255 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 23 conjuncts are in the unsatisfiable core [2024-11-14 05:05:41,552 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:05:41,900 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2024-11-14 05:05:41,900 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:05:45,330 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2024-11-14 05:05:45,330 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:05:45,330 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1253810321] [2024-11-14 05:05:45,330 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 05:05:45,330 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [585490952] [2024-11-14 05:05:45,330 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [585490952] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:05:45,330 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1941109392] [2024-11-14 05:05:45,344 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2024-11-14 05:05:45,344 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:05:45,344 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 05:05:45,344 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 05:05:45,344 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 05:05:47,006 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2024-11-14 05:05:47,013 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 05:05:48,289 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4851#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-14 05:05:48,290 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 05:05:48,290 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-14 05:05:48,290 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2024-11-14 05:05:48,290 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466009548] [2024-11-14 05:05:48,290 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-14 05:05:48,291 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2024-11-14 05:05:48,291 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:05:48,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2024-11-14 05:05:48,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=389, Unknown=0, NotChecked=0, Total=462 [2024-11-14 05:05:48,292 INFO L87 Difference]: Start difference. First operand 191 states and 223 transitions. Second operand has 10 states, 10 states have (on average 3.0) internal successors, (30), 9 states have internal predecessors, (30), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2024-11-14 05:05:49,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:05:49,134 INFO L93 Difference]: Finished difference Result 239 states and 272 transitions. [2024-11-14 05:05:49,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2024-11-14 05:05:49,135 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 9 states have internal predecessors, (30), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 56 [2024-11-14 05:05:49,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:05:49,137 INFO L225 Difference]: With dead ends: 239 [2024-11-14 05:05:49,138 INFO L226 Difference]: Without dead ends: 229 [2024-11-14 05:05:49,138 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 143 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=106, Invalid=544, Unknown=0, NotChecked=0, Total=650 [2024-11-14 05:05:49,139 INFO L432 NwaCegarLoop]: 36 mSDtfsCounter, 24 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 05:05:49,139 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 209 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 05:05:49,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2024-11-14 05:05:49,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 220. [2024-11-14 05:05:49,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 145 states have (on average 1.1310344827586207) internal successors, (164), 152 states have internal predecessors, (164), 42 states have call successors, (42), 32 states have call predecessors, (42), 32 states have return successors, (39), 35 states have call predecessors, (39), 39 states have call successors, (39) [2024-11-14 05:05:49,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 245 transitions. [2024-11-14 05:05:49,207 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 245 transitions. Word has length 56 [2024-11-14 05:05:49,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:05:49,208 INFO L471 AbstractCegarLoop]: Abstraction has 220 states and 245 transitions. [2024-11-14 05:05:49,208 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 9 states have internal predecessors, (30), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2024-11-14 05:05:49,208 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 245 transitions. [2024-11-14 05:05:49,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2024-11-14 05:05:49,210 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:05:49,210 INFO L215 NwaCegarLoop]: trace histogram [10, 9, 9, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 05:05:49,231 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2024-11-14 05:05:49,414 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2024-11-14 05:05:49,414 INFO L396 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:05:49,414 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:05:49,414 INFO L85 PathProgramCache]: Analyzing trace with hash -751945065, now seen corresponding path program 2 times [2024-11-14 05:05:49,414 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:05:49,414 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1826547989] [2024-11-14 05:05:49,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:49,415 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:05:49,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 05:05:49,447 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1987295250] [2024-11-14 05:05:49,447 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 05:05:49,447 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:05:49,447 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:05:49,449 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:05:49,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2024-11-14 05:05:49,516 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2024-11-14 05:05:49,516 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 05:05:49,518 INFO L255 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 31 conjuncts are in the unsatisfiable core [2024-11-14 05:05:49,520 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:05:49,767 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 26 proven. 26 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2024-11-14 05:05:49,767 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:05:50,948 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 26 proven. 26 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2024-11-14 05:05:50,948 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:05:50,948 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1826547989] [2024-11-14 05:05:50,948 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 05:05:50,948 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1987295250] [2024-11-14 05:05:50,949 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1987295250] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:05:50,949 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [649723629] [2024-11-14 05:05:50,950 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2024-11-14 05:05:50,950 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:05:50,951 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 05:05:50,951 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 05:05:50,951 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 05:05:52,344 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2024-11-14 05:05:52,347 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 05:05:53,424 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5965#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-14 05:05:53,424 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 05:05:53,424 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-14 05:05:53,424 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 16 [2024-11-14 05:05:53,424 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693186574] [2024-11-14 05:05:53,424 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-14 05:05:53,425 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2024-11-14 05:05:53,425 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:05:53,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2024-11-14 05:05:53,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=546, Unknown=0, NotChecked=0, Total=650 [2024-11-14 05:05:53,426 INFO L87 Difference]: Start difference. First operand 220 states and 245 transitions. Second operand has 16 states, 16 states have (on average 2.3125) internal successors, (37), 15 states have internal predecessors, (37), 8 states have call successors, (20), 3 states have call predecessors, (20), 2 states have return successors, (18), 6 states have call predecessors, (18), 8 states have call successors, (18) [2024-11-14 05:05:54,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:05:54,075 INFO L93 Difference]: Finished difference Result 267 states and 302 transitions. [2024-11-14 05:05:54,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2024-11-14 05:05:54,076 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.3125) internal successors, (37), 15 states have internal predecessors, (37), 8 states have call successors, (20), 3 states have call predecessors, (20), 2 states have return successors, (18), 6 states have call predecessors, (18), 8 states have call successors, (18) Word has length 61 [2024-11-14 05:05:54,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:05:54,078 INFO L225 Difference]: With dead ends: 267 [2024-11-14 05:05:54,078 INFO L226 Difference]: Without dead ends: 237 [2024-11-14 05:05:54,079 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 155 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 207 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=126, Invalid=630, Unknown=0, NotChecked=0, Total=756 [2024-11-14 05:05:54,079 INFO L432 NwaCegarLoop]: 29 mSDtfsCounter, 18 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 190 SdHoareTripleChecker+Invalid, 210 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-14 05:05:54,080 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 190 Invalid, 210 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 184 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-14 05:05:54,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2024-11-14 05:05:54,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 222. [2024-11-14 05:05:54,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 148 states have (on average 1.114864864864865) internal successors, (165), 153 states have internal predecessors, (165), 40 states have call successors, (40), 33 states have call predecessors, (40), 33 states have return successors, (38), 35 states have call predecessors, (38), 38 states have call successors, (38) [2024-11-14 05:05:54,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 243 transitions. [2024-11-14 05:05:54,134 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 243 transitions. Word has length 61 [2024-11-14 05:05:54,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:05:54,134 INFO L471 AbstractCegarLoop]: Abstraction has 222 states and 243 transitions. [2024-11-14 05:05:54,135 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.3125) internal successors, (37), 15 states have internal predecessors, (37), 8 states have call successors, (20), 3 states have call predecessors, (20), 2 states have return successors, (18), 6 states have call predecessors, (18), 8 states have call successors, (18) [2024-11-14 05:05:54,135 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 243 transitions. [2024-11-14 05:05:54,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2024-11-14 05:05:54,136 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:05:54,136 INFO L215 NwaCegarLoop]: trace histogram [11, 10, 10, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 05:05:54,150 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2024-11-14 05:05:54,337 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2024-11-14 05:05:54,338 INFO L396 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:05:54,338 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:05:54,338 INFO L85 PathProgramCache]: Analyzing trace with hash 611197790, now seen corresponding path program 1 times [2024-11-14 05:05:54,338 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:05:54,338 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1177272779] [2024-11-14 05:05:54,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:54,338 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:05:54,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 05:05:54,375 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1819935458] [2024-11-14 05:05:54,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:54,376 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:05:54,376 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:05:54,378 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:05:54,380 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2024-11-14 05:05:54,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:05:54,450 INFO L255 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 34 conjuncts are in the unsatisfiable core [2024-11-14 05:05:54,453 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:05:54,780 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 19 proven. 39 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2024-11-14 05:05:54,781 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:05:55,535 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 19 proven. 39 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2024-11-14 05:05:55,535 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:05:55,536 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1177272779] [2024-11-14 05:05:55,536 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 05:05:55,536 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1819935458] [2024-11-14 05:05:55,536 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1819935458] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:05:55,536 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1665491778] [2024-11-14 05:05:55,540 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2024-11-14 05:05:55,540 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:05:55,541 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 05:05:55,541 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 05:05:55,541 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 05:05:56,926 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2024-11-14 05:05:56,930 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 05:05:58,074 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7157#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-14 05:05:58,074 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 05:05:58,075 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-14 05:05:58,075 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2024-11-14 05:05:58,075 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084371736] [2024-11-14 05:05:58,075 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-14 05:05:58,075 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2024-11-14 05:05:58,075 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:05:58,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2024-11-14 05:05:58,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=731, Unknown=0, NotChecked=0, Total=870 [2024-11-14 05:05:58,076 INFO L87 Difference]: Start difference. First operand 222 states and 243 transitions. Second operand has 19 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 11 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 9 states have call successors, (20) [2024-11-14 05:05:58,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:05:58,748 INFO L93 Difference]: Finished difference Result 244 states and 269 transitions. [2024-11-14 05:05:58,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2024-11-14 05:05:58,749 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 11 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 9 states have call successors, (20) Word has length 67 [2024-11-14 05:05:58,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:05:58,750 INFO L225 Difference]: With dead ends: 244 [2024-11-14 05:05:58,751 INFO L226 Difference]: Without dead ends: 240 [2024-11-14 05:05:58,751 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 169 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 301 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=179, Invalid=877, Unknown=0, NotChecked=0, Total=1056 [2024-11-14 05:05:58,752 INFO L432 NwaCegarLoop]: 27 mSDtfsCounter, 22 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 190 SdHoareTripleChecker+Invalid, 243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 05:05:58,752 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 190 Invalid, 243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 05:05:58,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2024-11-14 05:05:58,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 220. [2024-11-14 05:05:58,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 148 states have (on average 1.114864864864865) internal successors, (165), 150 states have internal predecessors, (165), 39 states have call successors, (39), 33 states have call predecessors, (39), 32 states have return successors, (37), 36 states have call predecessors, (37), 37 states have call successors, (37) [2024-11-14 05:05:58,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 241 transitions. [2024-11-14 05:05:58,805 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 241 transitions. Word has length 67 [2024-11-14 05:05:58,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:05:58,806 INFO L471 AbstractCegarLoop]: Abstraction has 220 states and 241 transitions. [2024-11-14 05:05:58,806 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 11 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 9 states have call successors, (20) [2024-11-14 05:05:58,806 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 241 transitions. [2024-11-14 05:05:58,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2024-11-14 05:05:58,807 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:05:58,807 INFO L215 NwaCegarLoop]: trace histogram [12, 11, 11, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 05:05:58,822 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2024-11-14 05:05:59,012 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2024-11-14 05:05:59,012 INFO L396 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:05:59,012 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:05:59,012 INFO L85 PathProgramCache]: Analyzing trace with hash -542971976, now seen corresponding path program 1 times [2024-11-14 05:05:59,012 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:05:59,012 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1695975286] [2024-11-14 05:05:59,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:59,013 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:05:59,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:05:59,509 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 22 proven. 11 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2024-11-14 05:05:59,510 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:05:59,510 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1695975286] [2024-11-14 05:05:59,510 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1695975286] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:05:59,510 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1991295853] [2024-11-14 05:05:59,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:05:59,510 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:05:59,510 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:05:59,514 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:05:59,516 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2024-11-14 05:05:59,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:05:59,586 INFO L255 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 19 conjuncts are in the unsatisfiable core [2024-11-14 05:05:59,591 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:05:59,759 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 22 proven. 11 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2024-11-14 05:05:59,759 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:06:00,178 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 22 proven. 11 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2024-11-14 05:06:00,178 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1991295853] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:06:00,178 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2132675904] [2024-11-14 05:06:00,180 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2024-11-14 05:06:00,180 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:06:00,181 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 05:06:00,181 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 05:06:00,181 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 05:06:01,698 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2024-11-14 05:06:01,702 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 05:06:02,944 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8335#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-14 05:06:02,945 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 05:06:02,945 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:06:02,945 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2024-11-14 05:06:02,945 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [388426547] [2024-11-14 05:06:02,945 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:06:02,945 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2024-11-14 05:06:02,946 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:06:02,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2024-11-14 05:06:02,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=605, Unknown=0, NotChecked=0, Total=702 [2024-11-14 05:06:02,947 INFO L87 Difference]: Start difference. First operand 220 states and 241 transitions. Second operand has 14 states, 13 states have (on average 3.6153846153846154) internal successors, (47), 12 states have internal predecessors, (47), 8 states have call successors, (35), 3 states have call predecessors, (35), 1 states have return successors, (32), 8 states have call predecessors, (32), 8 states have call successors, (32) [2024-11-14 05:06:03,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:06:03,266 INFO L93 Difference]: Finished difference Result 233 states and 256 transitions. [2024-11-14 05:06:03,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2024-11-14 05:06:03,267 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 3.6153846153846154) internal successors, (47), 12 states have internal predecessors, (47), 8 states have call successors, (35), 3 states have call predecessors, (35), 1 states have return successors, (32), 8 states have call predecessors, (32), 8 states have call successors, (32) Word has length 72 [2024-11-14 05:06:03,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:06:03,269 INFO L225 Difference]: With dead ends: 233 [2024-11-14 05:06:03,269 INFO L226 Difference]: Without dead ends: 189 [2024-11-14 05:06:03,269 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 193 SyntacticMatches, 4 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=121, Invalid=749, Unknown=0, NotChecked=0, Total=870 [2024-11-14 05:06:03,270 INFO L432 NwaCegarLoop]: 39 mSDtfsCounter, 14 mSDsluCounter, 250 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 289 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 05:06:03,270 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 289 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 139 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 05:06:03,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2024-11-14 05:06:03,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 186. [2024-11-14 05:06:03,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 125 states have (on average 1.088) internal successors, (136), 127 states have internal predecessors, (136), 33 states have call successors, (33), 27 states have call predecessors, (33), 27 states have return successors, (32), 31 states have call predecessors, (32), 32 states have call successors, (32) [2024-11-14 05:06:03,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 201 transitions. [2024-11-14 05:06:03,324 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 201 transitions. Word has length 72 [2024-11-14 05:06:03,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:06:03,324 INFO L471 AbstractCegarLoop]: Abstraction has 186 states and 201 transitions. [2024-11-14 05:06:03,324 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 3.6153846153846154) internal successors, (47), 12 states have internal predecessors, (47), 8 states have call successors, (35), 3 states have call predecessors, (35), 1 states have return successors, (32), 8 states have call predecessors, (32), 8 states have call successors, (32) [2024-11-14 05:06:03,324 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 201 transitions. [2024-11-14 05:06:03,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2024-11-14 05:06:03,325 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:06:03,325 INFO L215 NwaCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2024-11-14 05:06:03,343 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2024-11-14 05:06:03,530 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2024-11-14 05:06:03,530 INFO L396 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:06:03,530 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:06:03,530 INFO L85 PathProgramCache]: Analyzing trace with hash 1276249920, now seen corresponding path program 3 times [2024-11-14 05:06:03,530 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:06:03,530 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1438367112] [2024-11-14 05:06:03,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:06:03,530 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:06:03,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 05:06:03,568 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [769879032] [2024-11-14 05:06:03,568 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 05:06:03,568 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:06:03,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:06:03,571 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:06:03,573 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2024-11-14 05:06:03,721 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 05:06:03,721 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 05:06:03,724 INFO L255 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 68 conjuncts are in the unsatisfiable core [2024-11-14 05:06:03,728 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:06:13,787 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 124 proven. 57 refuted. 0 times theorem prover too weak. 186 trivial. 0 not checked. [2024-11-14 05:06:13,788 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:07:02,029 WARN L286 SmtUtils]: Spent 13.59s on a formula simplification. DAG size of input: 124 DAG size of output: 122 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-11-14 05:07:23,679 WARN L286 SmtUtils]: Spent 8.35s on a formula simplification that was a NOOP. DAG size: 67 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-11-14 05:08:46,565 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 133 proven. 30 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2024-11-14 05:08:46,566 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:08:46,566 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1438367112] [2024-11-14 05:08:46,566 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 05:08:46,566 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [769879032] [2024-11-14 05:08:46,566 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [769879032] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:08:46,566 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1609118542] [2024-11-14 05:08:46,568 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2024-11-14 05:08:46,568 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:08:46,568 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 05:08:46,568 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 05:08:46,568 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 05:08:47,737 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2024-11-14 05:08:47,741 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 05:08:49,321 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9547#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-14 05:08:49,321 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 05:08:49,321 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-14 05:08:49,321 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15] total 26 [2024-11-14 05:08:49,322 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41435557] [2024-11-14 05:08:49,322 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-14 05:08:49,322 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2024-11-14 05:08:49,322 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:08:49,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2024-11-14 05:08:49,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=1016, Unknown=3, NotChecked=0, Total=1260 [2024-11-14 05:08:49,324 INFO L87 Difference]: Start difference. First operand 186 states and 201 transitions. Second operand has 26 states, 25 states have (on average 1.84) internal successors, (46), 17 states have internal predecessors, (46), 16 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 14 states have call predecessors, (24), 14 states have call successors, (24) [2024-11-14 05:08:58,110 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.27s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2024-11-14 05:09:04,782 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.23s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2024-11-14 05:09:17,234 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2024-11-14 05:09:22,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:09:22,128 INFO L93 Difference]: Finished difference Result 235 states and 272 transitions. [2024-11-14 05:09:22,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2024-11-14 05:09:22,129 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.84) internal successors, (46), 17 states have internal predecessors, (46), 16 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 14 states have call predecessors, (24), 14 states have call successors, (24) Word has length 87 [2024-11-14 05:09:22,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:09:22,131 INFO L225 Difference]: With dead ends: 235 [2024-11-14 05:09:22,131 INFO L226 Difference]: Without dead ends: 228 [2024-11-14 05:09:22,132 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 224 SyntacticMatches, 7 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 806 ImplicationChecksByTransitivity, 67.5s TimeCoverageRelationStatistics Valid=439, Invalid=1814, Unknown=3, NotChecked=0, Total=2256 [2024-11-14 05:09:22,133 INFO L432 NwaCegarLoop]: 48 mSDtfsCounter, 81 mSDsluCounter, 310 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 123 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 358 SdHoareTripleChecker+Invalid, 375 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.9s IncrementalHoareTripleChecker+Time [2024-11-14 05:09:22,133 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 358 Invalid, 375 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 251 Invalid, 1 Unknown, 0 Unchecked, 9.9s Time] [2024-11-14 05:09:22,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2024-11-14 05:09:22,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 216. [2024-11-14 05:09:22,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 144 states have (on average 1.125) internal successors, (162), 148 states have internal predecessors, (162), 43 states have call successors, (43), 28 states have call predecessors, (43), 28 states have return successors, (41), 39 states have call predecessors, (41), 41 states have call successors, (41) [2024-11-14 05:09:22,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 246 transitions. [2024-11-14 05:09:22,213 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 246 transitions. Word has length 87 [2024-11-14 05:09:22,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:09:22,214 INFO L471 AbstractCegarLoop]: Abstraction has 216 states and 246 transitions. [2024-11-14 05:09:22,214 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 1.84) internal successors, (46), 17 states have internal predecessors, (46), 16 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 14 states have call predecessors, (24), 14 states have call successors, (24) [2024-11-14 05:09:22,214 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 246 transitions. [2024-11-14 05:09:22,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2024-11-14 05:09:22,215 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:09:22,215 INFO L215 NwaCegarLoop]: trace histogram [15, 14, 14, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 05:09:22,231 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2024-11-14 05:09:22,416 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2024-11-14 05:09:22,416 INFO L396 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:09:22,416 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:09:22,416 INFO L85 PathProgramCache]: Analyzing trace with hash 1633214112, now seen corresponding path program 1 times [2024-11-14 05:09:22,416 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:09:22,417 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [945639961] [2024-11-14 05:09:22,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:09:22,417 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:09:22,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:09:22,644 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 28 proven. 44 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2024-11-14 05:09:22,644 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:09:22,644 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [945639961] [2024-11-14 05:09:22,644 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [945639961] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:09:22,644 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [205977762] [2024-11-14 05:09:22,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:09:22,645 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:09:22,645 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:09:22,647 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:09:22,652 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2024-11-14 05:09:22,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:09:22,733 INFO L255 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 11 conjuncts are in the unsatisfiable core [2024-11-14 05:09:22,735 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:09:22,866 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 120 proven. 260 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2024-11-14 05:09:22,866 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:09:23,073 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 28 proven. 44 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2024-11-14 05:09:23,074 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [205977762] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:09:23,074 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [691160343] [2024-11-14 05:09:23,076 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2024-11-14 05:09:23,077 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:09:23,077 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 05:09:23,078 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 05:09:23,079 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 05:09:24,011 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 10 for LOIs [2024-11-14 05:09:24,019 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 05:09:25,204 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10867#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-14 05:09:25,204 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 05:09:25,204 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:09:25,204 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 8] total 16 [2024-11-14 05:09:25,204 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1664843020] [2024-11-14 05:09:25,204 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:09:25,205 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2024-11-14 05:09:25,205 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:09:25,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2024-11-14 05:09:25,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=605, Unknown=0, NotChecked=0, Total=756 [2024-11-14 05:09:25,206 INFO L87 Difference]: Start difference. First operand 216 states and 246 transitions. Second operand has 16 states, 16 states have (on average 3.5625) internal successors, (57), 16 states have internal predecessors, (57), 9 states have call successors, (41), 6 states have call predecessors, (41), 6 states have return successors, (40), 9 states have call predecessors, (40), 9 states have call successors, (40) [2024-11-14 05:09:25,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:09:25,762 INFO L93 Difference]: Finished difference Result 548 states and 641 transitions. [2024-11-14 05:09:25,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2024-11-14 05:09:25,763 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.5625) internal successors, (57), 16 states have internal predecessors, (57), 9 states have call successors, (41), 6 states have call predecessors, (41), 6 states have return successors, (40), 9 states have call predecessors, (40), 9 states have call successors, (40) Word has length 94 [2024-11-14 05:09:25,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:09:25,766 INFO L225 Difference]: With dead ends: 548 [2024-11-14 05:09:25,766 INFO L226 Difference]: Without dead ends: 490 [2024-11-14 05:09:25,767 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 263 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 358 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=251, Invalid=1009, Unknown=0, NotChecked=0, Total=1260 [2024-11-14 05:09:25,767 INFO L432 NwaCegarLoop]: 29 mSDtfsCounter, 136 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 05:09:25,768 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [136 Valid, 186 Invalid, 203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 161 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 05:09:25,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2024-11-14 05:09:25,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 429. [2024-11-14 05:09:25,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 429 states, 279 states have (on average 1.146953405017921) internal successors, (320), 292 states have internal predecessors, (320), 91 states have call successors, (91), 58 states have call predecessors, (91), 58 states have return successors, (84), 78 states have call predecessors, (84), 84 states have call successors, (84) [2024-11-14 05:09:25,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 429 states to 429 states and 495 transitions. [2024-11-14 05:09:25,904 INFO L78 Accepts]: Start accepts. Automaton has 429 states and 495 transitions. Word has length 94 [2024-11-14 05:09:25,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:09:25,904 INFO L471 AbstractCegarLoop]: Abstraction has 429 states and 495 transitions. [2024-11-14 05:09:25,904 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.5625) internal successors, (57), 16 states have internal predecessors, (57), 9 states have call successors, (41), 6 states have call predecessors, (41), 6 states have return successors, (40), 9 states have call predecessors, (40), 9 states have call successors, (40) [2024-11-14 05:09:25,905 INFO L276 IsEmpty]: Start isEmpty. Operand 429 states and 495 transitions. [2024-11-14 05:09:25,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2024-11-14 05:09:25,906 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:09:25,906 INFO L215 NwaCegarLoop]: trace histogram [16, 15, 15, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2024-11-14 05:09:25,921 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2024-11-14 05:09:26,110 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2024-11-14 05:09:26,110 INFO L396 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:09:26,110 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:09:26,110 INFO L85 PathProgramCache]: Analyzing trace with hash 1641439005, now seen corresponding path program 2 times [2024-11-14 05:09:26,110 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:09:26,110 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1717862011] [2024-11-14 05:09:26,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:09:26,110 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:09:26,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 05:09:26,144 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1206014396] [2024-11-14 05:09:26,144 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 05:09:26,144 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:09:26,144 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:09:26,147 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:09:26,149 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2024-11-14 05:09:26,220 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-11-14 05:09:26,220 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 05:09:26,221 INFO L255 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 29 conjuncts are in the unsatisfiable core [2024-11-14 05:09:26,224 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:09:26,386 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 113 proven. 41 refuted. 0 times theorem prover too weak. 329 trivial. 0 not checked. [2024-11-14 05:09:26,386 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:09:26,598 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 110 proven. 2 refuted. 0 times theorem prover too weak. 371 trivial. 0 not checked. [2024-11-14 05:09:26,598 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:09:26,598 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1717862011] [2024-11-14 05:09:26,598 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 05:09:26,598 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1206014396] [2024-11-14 05:09:26,598 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1206014396] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:09:26,598 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1225898264] [2024-11-14 05:09:26,600 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2024-11-14 05:09:26,600 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:09:26,600 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 05:09:26,601 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 05:09:26,601 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 05:09:27,685 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2024-11-14 05:09:27,688 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 05:09:28,807 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13021#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-14 05:09:28,807 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 05:09:28,807 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-14 05:09:28,807 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 16 [2024-11-14 05:09:28,807 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2697772] [2024-11-14 05:09:28,807 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-14 05:09:28,808 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2024-11-14 05:09:28,808 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:09:28,808 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2024-11-14 05:09:28,809 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=590, Unknown=0, NotChecked=0, Total=702 [2024-11-14 05:09:28,809 INFO L87 Difference]: Start difference. First operand 429 states and 495 transitions. Second operand has 16 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 11 states have internal predecessors, (34), 7 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (18), 7 states have call predecessors, (18), 5 states have call successors, (18) [2024-11-14 05:09:29,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:09:29,337 INFO L93 Difference]: Finished difference Result 452 states and 520 transitions. [2024-11-14 05:09:29,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2024-11-14 05:09:29,337 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 11 states have internal predecessors, (34), 7 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (18), 7 states have call predecessors, (18), 5 states have call successors, (18) Word has length 98 [2024-11-14 05:09:29,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:09:29,340 INFO L225 Difference]: With dead ends: 452 [2024-11-14 05:09:29,340 INFO L226 Difference]: Without dead ends: 438 [2024-11-14 05:09:29,341 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 266 SyntacticMatches, 3 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=178, Invalid=878, Unknown=0, NotChecked=0, Total=1056 [2024-11-14 05:09:29,342 INFO L432 NwaCegarLoop]: 20 mSDtfsCounter, 52 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 05:09:29,342 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 141 Invalid, 186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 05:09:29,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 438 states. [2024-11-14 05:09:29,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 438 to 361. [2024-11-14 05:09:29,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 361 states, 239 states have (on average 1.096234309623431) internal successors, (262), 249 states have internal predecessors, (262), 69 states have call successors, (69), 52 states have call predecessors, (69), 52 states have return successors, (67), 59 states have call predecessors, (67), 67 states have call successors, (67) [2024-11-14 05:09:29,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 361 states to 361 states and 398 transitions. [2024-11-14 05:09:29,492 INFO L78 Accepts]: Start accepts. Automaton has 361 states and 398 transitions. Word has length 98 [2024-11-14 05:09:29,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:09:29,492 INFO L471 AbstractCegarLoop]: Abstraction has 361 states and 398 transitions. [2024-11-14 05:09:29,493 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 11 states have internal predecessors, (34), 7 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (18), 7 states have call predecessors, (18), 5 states have call successors, (18) [2024-11-14 05:09:29,493 INFO L276 IsEmpty]: Start isEmpty. Operand 361 states and 398 transitions. [2024-11-14 05:09:29,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2024-11-14 05:09:29,494 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:09:29,494 INFO L215 NwaCegarLoop]: trace histogram [16, 15, 15, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2024-11-14 05:09:29,515 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2024-11-14 05:09:29,694 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:09:29,695 INFO L396 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:09:29,695 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:09:29,695 INFO L85 PathProgramCache]: Analyzing trace with hash -1492496977, now seen corresponding path program 1 times [2024-11-14 05:09:29,696 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:09:29,696 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1173062887] [2024-11-14 05:09:29,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:09:29,696 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:09:29,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:09:30,107 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 30 proven. 39 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2024-11-14 05:09:30,108 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:09:30,108 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1173062887] [2024-11-14 05:09:30,108 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1173062887] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:09:30,108 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [755648593] [2024-11-14 05:09:30,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:09:30,108 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:09:30,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:09:30,110 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:09:30,112 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2024-11-14 05:09:30,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:09:30,193 INFO L255 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 15 conjuncts are in the unsatisfiable core [2024-11-14 05:09:30,195 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:09:30,351 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 30 proven. 411 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2024-11-14 05:09:30,351 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:09:30,618 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 30 proven. 39 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2024-11-14 05:09:30,618 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [755648593] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:09:30,618 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1888364376] [2024-11-14 05:09:30,620 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2024-11-14 05:09:30,620 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:09:30,620 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 05:09:30,621 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 05:09:30,621 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 05:09:31,883 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2024-11-14 05:09:31,887 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 05:09:33,021 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14934#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-14 05:09:33,021 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 05:09:33,021 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:09:33,021 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 10] total 20 [2024-11-14 05:09:33,022 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3634485] [2024-11-14 05:09:33,022 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:09:33,022 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-14 05:09:33,022 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:09:33,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-14 05:09:33,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=856, Unknown=0, NotChecked=0, Total=1056 [2024-11-14 05:09:33,023 INFO L87 Difference]: Start difference. First operand 361 states and 398 transitions. Second operand has 20 states, 20 states have (on average 3.45) internal successors, (69), 20 states have internal predecessors, (69), 13 states have call successors, (46), 8 states have call predecessors, (46), 7 states have return successors, (45), 12 states have call predecessors, (45), 12 states have call successors, (45) [2024-11-14 05:09:34,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:09:34,015 INFO L93 Difference]: Finished difference Result 625 states and 705 transitions. [2024-11-14 05:09:34,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2024-11-14 05:09:34,015 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.45) internal successors, (69), 20 states have internal predecessors, (69), 13 states have call successors, (46), 8 states have call predecessors, (46), 7 states have return successors, (45), 12 states have call predecessors, (45), 12 states have call successors, (45) Word has length 100 [2024-11-14 05:09:34,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:09:34,019 INFO L225 Difference]: With dead ends: 625 [2024-11-14 05:09:34,019 INFO L226 Difference]: Without dead ends: 611 [2024-11-14 05:09:34,020 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 275 SyntacticMatches, 3 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 580 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=334, Invalid=1472, Unknown=0, NotChecked=0, Total=1806 [2024-11-14 05:09:34,021 INFO L432 NwaCegarLoop]: 22 mSDtfsCounter, 158 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 266 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 05:09:34,021 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [158 Valid, 173 Invalid, 266 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 209 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 05:09:34,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 611 states. [2024-11-14 05:09:34,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 611 to 596. [2024-11-14 05:09:34,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 596 states, 399 states have (on average 1.055137844611529) internal successors, (421), 411 states have internal predecessors, (421), 111 states have call successors, (111), 85 states have call predecessors, (111), 85 states have return successors, (109), 99 states have call predecessors, (109), 109 states have call successors, (109) [2024-11-14 05:09:34,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 596 states to 596 states and 641 transitions. [2024-11-14 05:09:34,291 INFO L78 Accepts]: Start accepts. Automaton has 596 states and 641 transitions. Word has length 100 [2024-11-14 05:09:34,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:09:34,291 INFO L471 AbstractCegarLoop]: Abstraction has 596 states and 641 transitions. [2024-11-14 05:09:34,292 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.45) internal successors, (69), 20 states have internal predecessors, (69), 13 states have call successors, (46), 8 states have call predecessors, (46), 7 states have return successors, (45), 12 states have call predecessors, (45), 12 states have call successors, (45) [2024-11-14 05:09:34,292 INFO L276 IsEmpty]: Start isEmpty. Operand 596 states and 641 transitions. [2024-11-14 05:09:34,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2024-11-14 05:09:34,295 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:09:34,295 INFO L215 NwaCegarLoop]: trace histogram [32, 31, 31, 12, 11, 11, 11, 11, 11, 11, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2024-11-14 05:09:34,314 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2024-11-14 05:09:34,495 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:09:34,496 INFO L396 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:09:34,496 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:09:34,496 INFO L85 PathProgramCache]: Analyzing trace with hash 54867247, now seen corresponding path program 2 times [2024-11-14 05:09:34,496 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:09:34,496 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [263475190] [2024-11-14 05:09:34,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:09:34,496 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:09:34,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:09:35,588 INFO L134 CoverageAnalysis]: Checked inductivity of 2237 backedges. 62 proven. 315 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2024-11-14 05:09:35,588 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:09:35,588 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [263475190] [2024-11-14 05:09:35,589 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [263475190] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:09:35,589 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [99223597] [2024-11-14 05:09:35,589 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 05:09:35,589 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:09:35,589 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:09:35,591 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:09:35,595 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2024-11-14 05:09:35,884 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2024-11-14 05:09:35,884 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 05:09:35,889 INFO L255 TraceCheckSpWp]: Trace formula consists of 491 conjuncts, 31 conjuncts are in the unsatisfiable core [2024-11-14 05:09:35,894 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:09:36,156 INFO L134 CoverageAnalysis]: Checked inductivity of 2237 backedges. 62 proven. 2095 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2024-11-14 05:09:36,156 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:09:36,727 INFO L134 CoverageAnalysis]: Checked inductivity of 2237 backedges. 62 proven. 315 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2024-11-14 05:09:36,728 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [99223597] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:09:36,728 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [10941142] [2024-11-14 05:09:36,729 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2024-11-14 05:09:36,730 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:09:36,731 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 05:09:36,731 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 05:09:36,731 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 05:09:37,816 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2024-11-14 05:09:37,820 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 05:09:39,539 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18125#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-14 05:09:39,539 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 05:09:39,539 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:09:39,539 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17, 18] total 36 [2024-11-14 05:09:39,540 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629006647] [2024-11-14 05:09:39,540 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:09:39,541 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2024-11-14 05:09:39,541 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:09:39,543 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2024-11-14 05:09:39,544 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=608, Invalid=1744, Unknown=0, NotChecked=0, Total=2352 [2024-11-14 05:09:39,544 INFO L87 Difference]: Start difference. First operand 596 states and 641 transitions. Second operand has 36 states, 36 states have (on average 3.9166666666666665) internal successors, (141), 36 states have internal predecessors, (141), 29 states have call successors, (94), 16 states have call predecessors, (94), 15 states have return successors, (93), 28 states have call predecessors, (93), 28 states have call successors, (93) [2024-11-14 05:09:42,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:09:42,069 INFO L93 Difference]: Finished difference Result 1491 states and 1712 transitions. [2024-11-14 05:09:42,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2024-11-14 05:09:42,070 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.9166666666666665) internal successors, (141), 36 states have internal predecessors, (141), 29 states have call successors, (94), 16 states have call predecessors, (94), 15 states have return successors, (93), 28 states have call predecessors, (93), 28 states have call successors, (93) Word has length 204 [2024-11-14 05:09:42,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:09:42,077 INFO L225 Difference]: With dead ends: 1491 [2024-11-14 05:09:42,077 INFO L226 Difference]: Without dead ends: 1477 [2024-11-14 05:09:42,080 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 655 GetRequests, 571 SyntacticMatches, 11 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1912 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1374, Invalid=4176, Unknown=0, NotChecked=0, Total=5550 [2024-11-14 05:09:42,080 INFO L432 NwaCegarLoop]: 22 mSDtfsCounter, 456 mSDsluCounter, 271 mSDsCounter, 0 mSdLazyCounter, 428 mSolverCounterSat, 228 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 456 SdHoareTripleChecker+Valid, 293 SdHoareTripleChecker+Invalid, 656 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 228 IncrementalHoareTripleChecker+Valid, 428 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2024-11-14 05:09:42,080 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [456 Valid, 293 Invalid, 656 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [228 Valid, 428 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2024-11-14 05:09:42,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1477 states. [2024-11-14 05:09:42,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1477 to 1364. [2024-11-14 05:09:42,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1364 states, 911 states have (on average 1.0592755214050493) internal successors, (965), 939 states have internal predecessors, (965), 255 states have call successors, (255), 197 states have call predecessors, (255), 197 states have return successors, (253), 227 states have call predecessors, (253), 253 states have call successors, (253) [2024-11-14 05:09:42,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1364 states to 1364 states and 1473 transitions. [2024-11-14 05:09:42,714 INFO L78 Accepts]: Start accepts. Automaton has 1364 states and 1473 transitions. Word has length 204 [2024-11-14 05:09:42,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:09:42,715 INFO L471 AbstractCegarLoop]: Abstraction has 1364 states and 1473 transitions. [2024-11-14 05:09:42,716 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 3.9166666666666665) internal successors, (141), 36 states have internal predecessors, (141), 29 states have call successors, (94), 16 states have call predecessors, (94), 15 states have return successors, (93), 28 states have call predecessors, (93), 28 states have call successors, (93) [2024-11-14 05:09:42,716 INFO L276 IsEmpty]: Start isEmpty. Operand 1364 states and 1473 transitions. [2024-11-14 05:09:42,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 413 [2024-11-14 05:09:42,724 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:09:42,724 INFO L215 NwaCegarLoop]: trace histogram [64, 63, 63, 28, 27, 27, 27, 27, 27, 27, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2024-11-14 05:09:42,749 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2024-11-14 05:09:42,929 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2024-11-14 05:09:42,929 INFO L396 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:09:42,929 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:09:42,929 INFO L85 PathProgramCache]: Analyzing trace with hash 1089373231, now seen corresponding path program 3 times [2024-11-14 05:09:42,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:09:42,930 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1747014135] [2024-11-14 05:09:42,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:09:42,930 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:09:43,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:09:46,940 INFO L134 CoverageAnalysis]: Checked inductivity of 9765 backedges. 126 proven. 1827 refuted. 0 times theorem prover too weak. 7812 trivial. 0 not checked. [2024-11-14 05:09:46,940 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:09:46,940 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1747014135] [2024-11-14 05:09:46,940 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1747014135] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:09:46,941 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [735472168] [2024-11-14 05:09:46,941 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 05:09:46,941 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:09:46,941 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:09:46,943 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:09:46,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_420990a8-bbaa-4181-b6e0-1dd1ca628112/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process