./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 e7bb482b Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/config/AutomizerReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 5506d4c7458a400c41a33af3f6404f1e04b9f2e97e99f1fb53b74acf6bf59baf --- Real Ultimate output --- This is Ultimate 0.2.3-dev-e7bb482 [2023-11-06 23:11:28,261 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-06 23:11:28,403 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/config/svcomp-Reach-32bit-Automizer_Default.epf [2023-11-06 23:11:28,414 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-06 23:11:28,416 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-06 23:11:28,457 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-06 23:11:28,461 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-06 23:11:28,462 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-06 23:11:28,463 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-06 23:11:28,469 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-06 23:11:28,470 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-06 23:11:28,470 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-06 23:11:28,471 INFO L153 SettingsManager]: * Use SBE=true [2023-11-06 23:11:28,473 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-06 23:11:28,473 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-06 23:11:28,474 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-06 23:11:28,474 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-06 23:11:28,474 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-06 23:11:28,475 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-06 23:11:28,475 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-06 23:11:28,476 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-06 23:11:28,476 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-06 23:11:28,477 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-06 23:11:28,477 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-06 23:11:28,478 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-06 23:11:28,479 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-06 23:11:28,479 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-06 23:11:28,480 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-06 23:11:28,480 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 23:11:28,481 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-06 23:11:28,482 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-06 23:11:28,482 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-11-06 23:11:28,482 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-11-06 23:11:28,483 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-06 23:11:28,483 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-11-06 23:11:28,483 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-06 23:11:28,484 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-11-06 23:11:28,484 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-06 23:11:28,484 INFO L153 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC [2023-11-06 23:11:28,484 INFO L153 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5506d4c7458a400c41a33af3f6404f1e04b9f2e97e99f1fb53b74acf6bf59baf [2023-11-06 23:11:28,807 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-06 23:11:28,830 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-06 23:11:28,833 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-06 23:11:28,834 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-06 23:11:28,835 INFO L274 PluginConnector]: CDTParser initialized [2023-11-06 23:11:28,836 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/../../sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound50.c [2023-11-06 23:11:31,982 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-06 23:11:32,229 INFO L384 CDTParser]: Found 1 translation units. [2023-11-06 23:11:32,229 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound50.c [2023-11-06 23:11:32,240 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/data/03c00d63d/0831db823d49422d89d32ec216f3906c/FLAG63f13f2d4 [2023-11-06 23:11:32,258 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/data/03c00d63d/0831db823d49422d89d32ec216f3906c [2023-11-06 23:11:32,261 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-06 23:11:32,263 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-06 23:11:32,264 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-06 23:11:32,265 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-06 23:11:32,271 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-06 23:11:32,272 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 11:11:32" (1/1) ... [2023-11-06 23:11:32,273 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4b34078d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:11:32, skipping insertion in model container [2023-11-06 23:11:32,273 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 11:11:32" (1/1) ... [2023-11-06 23:11:32,298 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-06 23:11:32,462 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound50.c[526,539] [2023-11-06 23:11:32,482 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 23:11:32,495 INFO L202 MainTranslator]: Completed pre-run [2023-11-06 23:11:32,513 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound50.c[526,539] [2023-11-06 23:11:32,532 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 23:11:32,550 INFO L206 MainTranslator]: Completed translation [2023-11-06 23:11:32,551 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:11:32 WrapperNode [2023-11-06 23:11:32,551 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-06 23:11:32,553 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-06 23:11:32,553 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-06 23:11:32,553 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-06 23:11:32,562 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:11:32" (1/1) ... [2023-11-06 23:11:32,570 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:11:32" (1/1) ... [2023-11-06 23:11:32,592 INFO L138 Inliner]: procedures = 14, calls = 22, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 69 [2023-11-06 23:11:32,593 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-06 23:11:32,594 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-06 23:11:32,594 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-06 23:11:32,594 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-06 23:11:32,605 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:11:32" (1/1) ... [2023-11-06 23:11:32,606 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:11:32" (1/1) ... [2023-11-06 23:11:32,613 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:11:32" (1/1) ... [2023-11-06 23:11:32,613 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:11:32" (1/1) ... [2023-11-06 23:11:32,618 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:11:32" (1/1) ... [2023-11-06 23:11:32,623 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:11:32" (1/1) ... [2023-11-06 23:11:32,631 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:11:32" (1/1) ... [2023-11-06 23:11:32,632 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:11:32" (1/1) ... [2023-11-06 23:11:32,633 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-06 23:11:32,634 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-06 23:11:32,635 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-06 23:11:32,635 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-06 23:11:32,636 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:11:32" (1/1) ... [2023-11-06 23:11:32,644 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 23:11:32,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 [2023-11-06 23:11:32,677 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-06 23:11:32,712 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-06 23:11:32,735 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-06 23:11:32,735 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-06 23:11:32,736 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-06 23:11:32,736 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-06 23:11:32,736 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-06 23:11:32,736 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-06 23:11:32,819 INFO L236 CfgBuilder]: Building ICFG [2023-11-06 23:11:32,822 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-06 23:11:33,052 INFO L277 CfgBuilder]: Performing block encoding [2023-11-06 23:11:33,059 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-06 23:11:33,059 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-06 23:11:33,061 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 11:11:33 BoogieIcfgContainer [2023-11-06 23:11:33,062 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-06 23:11:33,065 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-06 23:11:33,065 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-06 23:11:33,069 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-06 23:11:33,070 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 11:11:32" (1/3) ... [2023-11-06 23:11:33,071 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e5dfc72 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 11:11:33, skipping insertion in model container [2023-11-06 23:11:33,071 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:11:32" (2/3) ... [2023-11-06 23:11:33,071 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e5dfc72 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 11:11:33, skipping insertion in model container [2023-11-06 23:11:33,072 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 11:11:33" (3/3) ... [2023-11-06 23:11:33,073 INFO L112 eAbstractionObserver]: Analyzing ICFG hard2_unwindbound50.c [2023-11-06 23:11:33,096 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-06 23:11:33,096 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-06 23:11:33,153 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-06 23:11:33,167 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@31a53f13, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-11-06 23:11:33,168 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-06 23:11:33,173 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 16 states have (on average 1.5625) internal successors, (25), 17 states have internal predecessors, (25), 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) [2023-11-06 23:11:33,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-06 23:11:33,182 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 23:11:33,182 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 23:11:33,183 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 23:11:33,188 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 23:11:33,188 INFO L85 PathProgramCache]: Analyzing trace with hash 643118537, now seen corresponding path program 1 times [2023-11-06 23:11:33,197 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 23:11:33,198 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1081331480] [2023-11-06 23:11:33,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:11:33,198 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 23:11:33,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 23:11:33,328 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 23:11:33,328 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1081331480] [2023-11-06 23:11:33,329 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-11-06 23:11:33,329 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1154284579] [2023-11-06 23:11:33,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:11:33,330 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:11:33,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 [2023-11-06 23:11:33,332 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 23:11:33,337 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-06 23:11:33,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 23:11:33,408 INFO L262 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 1 conjunts are in the unsatisfiable core [2023-11-06 23:11:33,412 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 23:11:33,436 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 23:11:33,436 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 23:11:33,437 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1154284579] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 23:11:33,437 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 23:11:33,438 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 23:11:33,440 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085277985] [2023-11-06 23:11:33,441 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 23:11:33,446 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-06 23:11:33,446 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 23:11:33,481 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-06 23:11:33,482 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-06 23:11:33,484 INFO L87 Difference]: Start difference. First operand has 26 states, 16 states have (on average 1.5625) internal successors, (25), 17 states have internal predecessors, (25), 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 3.5) internal successors, (7), 2 states have internal predecessors, (7), 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) [2023-11-06 23:11:33,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 23:11:33,511 INFO L93 Difference]: Finished difference Result 50 states and 83 transitions. [2023-11-06 23:11:33,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-06 23:11:33,514 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 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 8 [2023-11-06 23:11:33,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 23:11:33,521 INFO L225 Difference]: With dead ends: 50 [2023-11-06 23:11:33,521 INFO L226 Difference]: Without dead ends: 22 [2023-11-06 23:11:33,524 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-06 23:11:33,528 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 23:11:33,530 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 23:11:33,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-11-06 23:11:33,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-11-06 23:11:33,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 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) [2023-11-06 23:11:33,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 32 transitions. [2023-11-06 23:11:33,578 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 32 transitions. Word has length 8 [2023-11-06 23:11:33,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 23:11:33,579 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 32 transitions. [2023-11-06 23:11:33,579 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 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) [2023-11-06 23:11:33,579 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 32 transitions. [2023-11-06 23:11:33,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-06 23:11:33,580 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 23:11:33,580 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 23:11:33,586 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-06 23:11:33,781 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-11-06 23:11:33,782 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 23:11:33,782 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 23:11:33,782 INFO L85 PathProgramCache]: Analyzing trace with hash 181060127, now seen corresponding path program 1 times [2023-11-06 23:11:33,783 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 23:11:33,783 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [361798322] [2023-11-06 23:11:33,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:11:33,783 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 23:11:33,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 23:11:34,004 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 23:11:34,005 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 23:11:34,005 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [361798322] [2023-11-06 23:11:34,005 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [361798322] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 23:11:34,006 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 23:11:34,006 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-06 23:11:34,006 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422176522] [2023-11-06 23:11:34,006 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 23:11:34,018 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-06 23:11:34,019 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 23:11:34,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-06 23:11:34,020 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-06 23:11:34,021 INFO L87 Difference]: Start difference. First operand 22 states and 32 transitions. Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 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) [2023-11-06 23:11:34,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 23:11:34,116 INFO L93 Difference]: Finished difference Result 36 states and 51 transitions. [2023-11-06 23:11:34,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 23:11:34,117 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 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 8 [2023-11-06 23:11:34,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 23:11:34,118 INFO L225 Difference]: With dead ends: 36 [2023-11-06 23:11:34,119 INFO L226 Difference]: Without dead ends: 34 [2023-11-06 23:11:34,119 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-06 23:11:34,121 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 15 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 23:11:34,122 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 96 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 23:11:34,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-11-06 23:11:34,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 26. [2023-11-06 23:11:34,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 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) [2023-11-06 23:11:34,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 35 transitions. [2023-11-06 23:11:34,136 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 35 transitions. Word has length 8 [2023-11-06 23:11:34,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 23:11:34,136 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 35 transitions. [2023-11-06 23:11:34,137 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 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) [2023-11-06 23:11:34,137 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 35 transitions. [2023-11-06 23:11:34,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-06 23:11:34,138 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 23:11:34,138 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 23:11:34,138 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-06 23:11:34,139 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 23:11:34,139 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 23:11:34,140 INFO L85 PathProgramCache]: Analyzing trace with hash -712280900, now seen corresponding path program 1 times [2023-11-06 23:11:34,140 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 23:11:34,140 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1323394703] [2023-11-06 23:11:34,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:11:34,141 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 23:11:34,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 23:11:34,165 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 23:11:34,166 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1323394703] [2023-11-06 23:11:34,166 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-11-06 23:11:34,166 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1076712219] [2023-11-06 23:11:34,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:11:34,167 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:11:34,167 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 [2023-11-06 23:11:34,168 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 23:11:34,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-06 23:11:34,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 23:11:34,271 INFO L262 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-06 23:11:34,272 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 23:11:34,345 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 23:11:34,346 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 23:11:34,346 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1076712219] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 23:11:34,346 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 23:11:34,346 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-06 23:11:34,347 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418324679] [2023-11-06 23:11:34,347 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 23:11:34,347 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-06 23:11:34,348 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 23:11:34,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-06 23:11:34,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-06 23:11:34,353 INFO L87 Difference]: Start difference. First operand 26 states and 35 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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) [2023-11-06 23:11:34,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 23:11:34,378 INFO L93 Difference]: Finished difference Result 42 states and 57 transitions. [2023-11-06 23:11:34,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-06 23:11:34,379 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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 10 [2023-11-06 23:11:34,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 23:11:34,381 INFO L225 Difference]: With dead ends: 42 [2023-11-06 23:11:34,381 INFO L226 Difference]: Without dead ends: 28 [2023-11-06 23:11:34,382 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-06 23:11:34,384 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 0 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 23:11:34,385 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 85 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 23:11:34,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-11-06 23:11:34,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2023-11-06 23:11:34,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 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) [2023-11-06 23:11:34,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 37 transitions. [2023-11-06 23:11:34,395 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 37 transitions. Word has length 10 [2023-11-06 23:11:34,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 23:11:34,396 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 37 transitions. [2023-11-06 23:11:34,396 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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) [2023-11-06 23:11:34,396 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 37 transitions. [2023-11-06 23:11:34,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-06 23:11:34,397 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 23:11:34,406 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 23:11:34,413 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-06 23:11:34,609 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:11:34,610 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 23:11:34,610 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 23:11:34,610 INFO L85 PathProgramCache]: Analyzing trace with hash 2036073049, now seen corresponding path program 1 times [2023-11-06 23:11:34,611 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 23:11:34,611 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1061858102] [2023-11-06 23:11:34,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:11:34,611 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 23:11:34,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 23:11:34,766 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2023-11-06 23:11:34,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 23:11:34,789 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 23:11:34,789 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 23:11:34,789 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1061858102] [2023-11-06 23:11:34,790 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1061858102] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 23:11:34,790 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 23:11:34,790 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-06 23:11:34,790 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566365011] [2023-11-06 23:11:34,791 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 23:11:34,791 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-06 23:11:34,791 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 23:11:34,792 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-06 23:11:34,793 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-06 23:11:34,793 INFO L87 Difference]: Start difference. First operand 28 states and 37 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, (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) [2023-11-06 23:11:34,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 23:11:34,903 INFO L93 Difference]: Finished difference Result 42 states and 56 transitions. [2023-11-06 23:11:34,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 23:11:34,904 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, (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 13 [2023-11-06 23:11:34,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 23:11:34,905 INFO L225 Difference]: With dead ends: 42 [2023-11-06 23:11:34,905 INFO L226 Difference]: Without dead ends: 40 [2023-11-06 23:11:34,906 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-06 23:11:34,907 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 13 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 23:11:34,908 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 92 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 23:11:34,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2023-11-06 23:11:34,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 32. [2023-11-06 23:11:34,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 22 states have internal predecessors, (27), 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) [2023-11-06 23:11:34,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2023-11-06 23:11:34,925 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 13 [2023-11-06 23:11:34,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 23:11:34,926 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2023-11-06 23:11:34,926 INFO L496 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, (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) [2023-11-06 23:11:34,926 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2023-11-06 23:11:34,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-06 23:11:34,927 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 23:11:34,927 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 23:11:34,927 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-06 23:11:34,928 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 23:11:34,928 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 23:11:34,928 INFO L85 PathProgramCache]: Analyzing trace with hash 380169759, now seen corresponding path program 1 times [2023-11-06 23:11:34,929 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 23:11:34,929 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1115655517] [2023-11-06 23:11:34,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:11:34,933 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 23:11:34,965 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 23:11:34,965 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1068786909] [2023-11-06 23:11:34,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:11:34,966 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:11:34,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 [2023-11-06 23:11:34,982 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 23:11:35,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-06 23:11:35,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 23:11:35,048 INFO L262 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-06 23:11:35,050 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 23:11:35,212 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 23:11:35,212 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 23:11:35,510 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 23:11:35,510 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 23:11:35,510 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1115655517] [2023-11-06 23:11:35,510 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 23:11:35,511 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1068786909] [2023-11-06 23:11:35,511 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1068786909] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 23:11:35,511 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 23:11:35,511 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 12 [2023-11-06 23:11:35,511 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910895377] [2023-11-06 23:11:35,512 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 23:11:35,512 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-06 23:11:35,512 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 23:11:35,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-06 23:11:35,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2023-11-06 23:11:35,514 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 12 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 4 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-06 23:11:36,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 23:11:36,130 INFO L93 Difference]: Finished difference Result 71 states and 96 transitions. [2023-11-06 23:11:36,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-06 23:11:36,131 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 4 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 18 [2023-11-06 23:11:36,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 23:11:36,133 INFO L225 Difference]: With dead ends: 71 [2023-11-06 23:11:36,134 INFO L226 Difference]: Without dead ends: 56 [2023-11-06 23:11:36,135 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2023-11-06 23:11:36,136 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 42 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-06 23:11:36,136 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 97 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-06 23:11:36,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2023-11-06 23:11:36,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 54. [2023-11-06 23:11:36,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 33 states have (on average 1.2727272727272727) internal successors, (42), 36 states have internal predecessors, (42), 15 states have call successors, (15), 5 states have call predecessors, (15), 5 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2023-11-06 23:11:36,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 70 transitions. [2023-11-06 23:11:36,153 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 70 transitions. Word has length 18 [2023-11-06 23:11:36,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 23:11:36,154 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 70 transitions. [2023-11-06 23:11:36,154 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 4 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-06 23:11:36,154 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 70 transitions. [2023-11-06 23:11:36,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-06 23:11:36,155 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 23:11:36,156 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 23:11:36,167 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-06 23:11:36,362 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:11:36,362 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 23:11:36,363 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 23:11:36,363 INFO L85 PathProgramCache]: Analyzing trace with hash -461064832, now seen corresponding path program 1 times [2023-11-06 23:11:36,363 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 23:11:36,363 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2132179991] [2023-11-06 23:11:36,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:11:36,364 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 23:11:36,375 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 23:11:36,376 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2087802305] [2023-11-06 23:11:36,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:11:36,376 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:11:36,376 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 [2023-11-06 23:11:36,378 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 23:11:36,417 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-06 23:11:36,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 23:11:36,453 INFO L262 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-06 23:11:36,459 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 23:11:36,620 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-06 23:11:36,621 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 23:11:36,812 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-06 23:11:36,815 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 23:11:36,818 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2132179991] [2023-11-06 23:11:36,819 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 23:11:36,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2087802305] [2023-11-06 23:11:36,819 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2087802305] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 23:11:36,819 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 23:11:36,820 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2023-11-06 23:11:36,820 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [941788034] [2023-11-06 23:11:36,820 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 23:11:36,821 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-06 23:11:36,821 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 23:11:36,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-06 23:11:36,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2023-11-06 23:11:36,823 INFO L87 Difference]: Start difference. First operand 54 states and 70 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 3 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2023-11-06 23:11:37,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 23:11:37,031 INFO L93 Difference]: Finished difference Result 73 states and 97 transitions. [2023-11-06 23:11:37,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-06 23:11:37,032 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 3 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 26 [2023-11-06 23:11:37,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 23:11:37,033 INFO L225 Difference]: With dead ends: 73 [2023-11-06 23:11:37,033 INFO L226 Difference]: Without dead ends: 65 [2023-11-06 23:11:37,034 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2023-11-06 23:11:37,035 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 29 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 23:11:37,035 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 99 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 23:11:37,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-11-06 23:11:37,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2023-11-06 23:11:37,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 39 states have (on average 1.2820512820512822) internal successors, (50), 43 states have internal predecessors, (50), 16 states have call successors, (16), 6 states have call predecessors, (16), 6 states have return successors, (15), 12 states have call predecessors, (15), 15 states have call successors, (15) [2023-11-06 23:11:37,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 81 transitions. [2023-11-06 23:11:37,051 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 81 transitions. Word has length 26 [2023-11-06 23:11:37,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 23:11:37,052 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 81 transitions. [2023-11-06 23:11:37,052 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 3 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2023-11-06 23:11:37,052 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 81 transitions. [2023-11-06 23:11:37,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-11-06 23:11:37,053 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 23:11:37,054 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 23:11:37,065 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-06 23:11:37,259 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-06 23:11:37,259 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 23:11:37,260 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 23:11:37,260 INFO L85 PathProgramCache]: Analyzing trace with hash 847666457, now seen corresponding path program 1 times [2023-11-06 23:11:37,260 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 23:11:37,260 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1873388710] [2023-11-06 23:11:37,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:11:37,260 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 23:11:37,271 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 23:11:37,272 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [870211018] [2023-11-06 23:11:37,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:11:37,272 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:11:37,272 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 [2023-11-06 23:11:37,274 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 23:11:37,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-06 23:11:37,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 23:11:37,340 INFO L262 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-06 23:11:37,342 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 23:11:37,402 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 18 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-06 23:11:37,402 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 23:11:37,464 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-06 23:11:37,464 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 23:11:37,465 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1873388710] [2023-11-06 23:11:37,465 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 23:11:37,465 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [870211018] [2023-11-06 23:11:37,465 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [870211018] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 23:11:37,465 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 23:11:37,466 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2023-11-06 23:11:37,466 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598377825] [2023-11-06 23:11:37,466 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 23:11:37,467 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-06 23:11:37,467 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 23:11:37,468 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-06 23:11:37,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-11-06 23:11:37,469 INFO L87 Difference]: Start difference. First operand 62 states and 81 transitions. Second operand has 8 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2023-11-06 23:11:37,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 23:11:37,612 INFO L93 Difference]: Finished difference Result 165 states and 205 transitions. [2023-11-06 23:11:37,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-06 23:11:37,613 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 33 [2023-11-06 23:11:37,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 23:11:37,615 INFO L225 Difference]: With dead ends: 165 [2023-11-06 23:11:37,615 INFO L226 Difference]: Without dead ends: 127 [2023-11-06 23:11:37,619 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2023-11-06 23:11:37,621 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 34 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 23:11:37,621 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 107 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 23:11:37,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2023-11-06 23:11:37,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 121. [2023-11-06 23:11:37,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 79 states have (on average 1.1898734177215189) internal successors, (94), 83 states have internal predecessors, (94), 26 states have call successors, (26), 16 states have call predecessors, (26), 15 states have return successors, (24), 21 states have call predecessors, (24), 24 states have call successors, (24) [2023-11-06 23:11:37,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 144 transitions. [2023-11-06 23:11:37,691 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 144 transitions. Word has length 33 [2023-11-06 23:11:37,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 23:11:37,691 INFO L495 AbstractCegarLoop]: Abstraction has 121 states and 144 transitions. [2023-11-06 23:11:37,693 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2023-11-06 23:11:37,694 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 144 transitions. [2023-11-06 23:11:37,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2023-11-06 23:11:37,704 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 23:11:37,704 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 23:11:37,719 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-06 23:11:37,910 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-06 23:11:37,911 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 23:11:37,911 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 23:11:37,912 INFO L85 PathProgramCache]: Analyzing trace with hash 1605675221, now seen corresponding path program 1 times [2023-11-06 23:11:37,912 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 23:11:37,912 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1055535570] [2023-11-06 23:11:37,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:11:37,912 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 23:11:37,927 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 23:11:37,939 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [712279853] [2023-11-06 23:11:37,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:11:37,939 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:11:37,940 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 [2023-11-06 23:11:37,941 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 23:11:37,965 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-06 23:11:38,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 23:11:38,022 INFO L262 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-06 23:11:38,028 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 23:11:38,139 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 36 proven. 42 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-06 23:11:38,139 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 23:11:38,252 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2023-11-06 23:11:38,252 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 23:11:38,252 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1055535570] [2023-11-06 23:11:38,253 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 23:11:38,253 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [712279853] [2023-11-06 23:11:38,253 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [712279853] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 23:11:38,253 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 23:11:38,254 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2023-11-06 23:11:38,254 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663318191] [2023-11-06 23:11:38,255 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 23:11:38,257 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-06 23:11:38,257 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 23:11:38,259 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-06 23:11:38,259 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2023-11-06 23:11:38,259 INFO L87 Difference]: Start difference. First operand 121 states and 144 transitions. Second operand has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 5 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2023-11-06 23:11:38,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 23:11:38,485 INFO L93 Difference]: Finished difference Result 249 states and 307 transitions. [2023-11-06 23:11:38,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-06 23:11:38,486 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 5 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 49 [2023-11-06 23:11:38,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 23:11:38,492 INFO L225 Difference]: With dead ends: 249 [2023-11-06 23:11:38,492 INFO L226 Difference]: Without dead ends: 228 [2023-11-06 23:11:38,493 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=104, Unknown=0, NotChecked=0, Total=156 [2023-11-06 23:11:38,495 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 80 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 23:11:38,495 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 177 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 23:11:38,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2023-11-06 23:11:38,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 221. [2023-11-06 23:11:38,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 221 states, 144 states have (on average 1.1944444444444444) internal successors, (172), 155 states have internal predecessors, (172), 51 states have call successors, (51), 26 states have call predecessors, (51), 25 states have return successors, (47), 39 states have call predecessors, (47), 47 states have call successors, (47) [2023-11-06 23:11:38,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 270 transitions. [2023-11-06 23:11:38,561 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 270 transitions. Word has length 49 [2023-11-06 23:11:38,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 23:11:38,563 INFO L495 AbstractCegarLoop]: Abstraction has 221 states and 270 transitions. [2023-11-06 23:11:38,563 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 5 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2023-11-06 23:11:38,563 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 270 transitions. [2023-11-06 23:11:38,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2023-11-06 23:11:38,565 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 23:11:38,565 INFO L195 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, 1, 1] [2023-11-06 23:11:38,579 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-06 23:11:38,771 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-06 23:11:38,771 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 23:11:38,772 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 23:11:38,772 INFO L85 PathProgramCache]: Analyzing trace with hash -1800695307, now seen corresponding path program 1 times [2023-11-06 23:11:38,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 23:11:38,772 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [914968371] [2023-11-06 23:11:38,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:11:38,772 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 23:11:38,781 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 23:11:38,782 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1003954072] [2023-11-06 23:11:38,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:11:38,782 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:11:38,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 [2023-11-06 23:11:38,783 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 23:11:38,789 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-06 23:11:38,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 23:11:38,860 INFO L262 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 33 conjunts are in the unsatisfiable core [2023-11-06 23:11:38,863 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 23:11:39,274 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 18 proven. 28 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2023-11-06 23:11:39,275 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 23:11:41,279 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 18 proven. 28 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2023-11-06 23:11:41,279 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 23:11:41,280 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [914968371] [2023-11-06 23:11:41,280 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 23:11:41,280 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1003954072] [2023-11-06 23:11:41,280 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1003954072] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 23:11:41,280 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 23:11:41,281 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 15 [2023-11-06 23:11:41,281 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [734928249] [2023-11-06 23:11:41,281 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 23:11:41,282 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-06 23:11:41,282 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 23:11:41,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-06 23:11:41,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2023-11-06 23:11:41,283 INFO L87 Difference]: Start difference. First operand 221 states and 270 transitions. Second operand has 15 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 14 states have internal predecessors, (40), 7 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 5 states have call predecessors, (16), 5 states have call successors, (16) [2023-11-06 23:11:47,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 23:11:47,311 INFO L93 Difference]: Finished difference Result 372 states and 479 transitions. [2023-11-06 23:11:47,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-06 23:11:47,312 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 14 states have internal predecessors, (40), 7 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 5 states have call predecessors, (16), 5 states have call successors, (16) Word has length 58 [2023-11-06 23:11:47,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 23:11:47,315 INFO L225 Difference]: With dead ends: 372 [2023-11-06 23:11:47,315 INFO L226 Difference]: Without dead ends: 299 [2023-11-06 23:11:47,316 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=83, Invalid=297, Unknown=0, NotChecked=0, Total=380 [2023-11-06 23:11:47,317 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 60 mSDsluCounter, 201 mSDsCounter, 0 mSdLazyCounter, 239 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 237 SdHoareTripleChecker+Invalid, 322 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 239 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-06 23:11:47,318 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 237 Invalid, 322 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 239 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-11-06 23:11:47,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2023-11-06 23:11:47,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 272. [2023-11-06 23:11:47,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 272 states, 186 states have (on average 1.2258064516129032) internal successors, (228), 194 states have internal predecessors, (228), 56 states have call successors, (56), 29 states have call predecessors, (56), 29 states have return successors, (54), 48 states have call predecessors, (54), 54 states have call successors, (54) [2023-11-06 23:11:47,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 338 transitions. [2023-11-06 23:11:47,408 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 338 transitions. Word has length 58 [2023-11-06 23:11:47,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 23:11:47,409 INFO L495 AbstractCegarLoop]: Abstraction has 272 states and 338 transitions. [2023-11-06 23:11:47,409 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 14 states have internal predecessors, (40), 7 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 5 states have call predecessors, (16), 5 states have call successors, (16) [2023-11-06 23:11:47,409 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 338 transitions. [2023-11-06 23:11:47,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2023-11-06 23:11:47,411 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 23:11:47,411 INFO L195 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, 1, 1] [2023-11-06 23:11:47,417 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-06 23:11:47,617 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:11:47,617 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 23:11:47,617 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 23:11:47,618 INFO L85 PathProgramCache]: Analyzing trace with hash -1688778742, now seen corresponding path program 1 times [2023-11-06 23:11:47,618 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 23:11:47,618 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [785023981] [2023-11-06 23:11:47,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:11:47,618 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 23:11:47,629 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 23:11:47,634 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1429873988] [2023-11-06 23:11:47,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:11:47,634 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:11:47,635 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 [2023-11-06 23:11:47,636 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 23:11:47,641 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-06 23:11:47,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 23:11:47,712 INFO L262 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 35 conjunts are in the unsatisfiable core [2023-11-06 23:11:47,716 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 23:11:48,098 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 22 proven. 36 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2023-11-06 23:11:48,099 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 23:11:48,992 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 22 proven. 36 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2023-11-06 23:11:48,992 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 23:11:48,993 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [785023981] [2023-11-06 23:11:48,993 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 23:11:48,993 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1429873988] [2023-11-06 23:11:48,993 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1429873988] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 23:11:48,993 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 23:11:48,993 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 16 [2023-11-06 23:11:48,994 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629655152] [2023-11-06 23:11:48,994 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 23:11:48,995 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-06 23:11:48,995 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 23:11:48,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-06 23:11:48,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2023-11-06 23:11:48,996 INFO L87 Difference]: Start difference. First operand 272 states and 338 transitions. Second operand has 16 states, 14 states have (on average 3.0) internal successors, (42), 15 states have internal predecessors, (42), 8 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (20), 6 states have call predecessors, (20), 6 states have call successors, (20) [2023-11-06 23:11:49,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 23:11:49,664 INFO L93 Difference]: Finished difference Result 341 states and 423 transitions. [2023-11-06 23:11:49,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-06 23:11:49,666 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 3.0) internal successors, (42), 15 states have internal predecessors, (42), 8 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (20), 6 states have call predecessors, (20), 6 states have call successors, (20) Word has length 69 [2023-11-06 23:11:49,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 23:11:49,668 INFO L225 Difference]: With dead ends: 341 [2023-11-06 23:11:49,669 INFO L226 Difference]: Without dead ends: 260 [2023-11-06 23:11:49,670 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2023-11-06 23:11:49,670 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 36 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-06 23:11:49,671 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 167 Invalid, 225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 187 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-06 23:11:49,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2023-11-06 23:11:49,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 236. [2023-11-06 23:11:49,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 236 states, 161 states have (on average 1.1801242236024845) internal successors, (190), 165 states have internal predecessors, (190), 46 states have call successors, (46), 29 states have call predecessors, (46), 28 states have return successors, (44), 41 states have call predecessors, (44), 44 states have call successors, (44) [2023-11-06 23:11:49,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 280 transitions. [2023-11-06 23:11:49,774 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 280 transitions. Word has length 69 [2023-11-06 23:11:49,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 23:11:49,776 INFO L495 AbstractCegarLoop]: Abstraction has 236 states and 280 transitions. [2023-11-06 23:11:49,776 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 3.0) internal successors, (42), 15 states have internal predecessors, (42), 8 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (20), 6 states have call predecessors, (20), 6 states have call successors, (20) [2023-11-06 23:11:49,777 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 280 transitions. [2023-11-06 23:11:49,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2023-11-06 23:11:49,779 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 23:11:49,779 INFO L195 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, 1, 1] [2023-11-06 23:11:49,794 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-11-06 23:11:49,985 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:11:49,985 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 23:11:49,985 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 23:11:49,986 INFO L85 PathProgramCache]: Analyzing trace with hash -428937714, now seen corresponding path program 1 times [2023-11-06 23:11:49,986 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 23:11:49,986 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [430570057] [2023-11-06 23:11:49,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:11:49,986 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 23:11:50,005 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 23:11:50,009 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [652857301] [2023-11-06 23:11:50,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:11:50,009 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:11:50,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 [2023-11-06 23:11:50,013 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 23:11:50,026 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-06 23:11:50,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 23:11:50,093 INFO L262 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 29 conjunts are in the unsatisfiable core [2023-11-06 23:11:50,097 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 23:11:50,340 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 24 proven. 39 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2023-11-06 23:11:50,341 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 23:11:51,008 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 24 proven. 39 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2023-11-06 23:11:51,008 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 23:11:51,008 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [430570057] [2023-11-06 23:11:51,008 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 23:11:51,009 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [652857301] [2023-11-06 23:11:51,009 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [652857301] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 23:11:51,009 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 23:11:51,009 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 16 [2023-11-06 23:11:51,010 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [101973782] [2023-11-06 23:11:51,010 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 23:11:51,010 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-06 23:11:51,011 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 23:11:51,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-06 23:11:51,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2023-11-06 23:11:51,012 INFO L87 Difference]: Start difference. First operand 236 states and 280 transitions. Second operand has 16 states, 14 states have (on average 3.0) internal successors, (42), 15 states have internal predecessors, (42), 8 states have call successors, (24), 3 states have call predecessors, (24), 2 states have return successors, (22), 8 states have call predecessors, (22), 8 states have call successors, (22) [2023-11-06 23:11:51,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 23:11:51,551 INFO L93 Difference]: Finished difference Result 260 states and 307 transitions. [2023-11-06 23:11:51,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-06 23:11:51,552 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 3.0) internal successors, (42), 15 states have internal predecessors, (42), 8 states have call successors, (24), 3 states have call predecessors, (24), 2 states have return successors, (22), 8 states have call predecessors, (22), 8 states have call successors, (22) Word has length 74 [2023-11-06 23:11:51,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 23:11:51,554 INFO L225 Difference]: With dead ends: 260 [2023-11-06 23:11:51,554 INFO L226 Difference]: Without dead ends: 215 [2023-11-06 23:11:51,555 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2023-11-06 23:11:51,556 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 25 mSDsluCounter, 191 mSDsCounter, 0 mSdLazyCounter, 226 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-06 23:11:51,556 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 220 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 226 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-06 23:11:51,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2023-11-06 23:11:51,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 210. [2023-11-06 23:11:51,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 143 states have (on average 1.1468531468531469) internal successors, (164), 148 states have internal predecessors, (164), 41 states have call successors, (41), 25 states have call predecessors, (41), 25 states have return successors, (39), 36 states have call predecessors, (39), 39 states have call successors, (39) [2023-11-06 23:11:51,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 244 transitions. [2023-11-06 23:11:51,631 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 244 transitions. Word has length 74 [2023-11-06 23:11:51,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 23:11:51,631 INFO L495 AbstractCegarLoop]: Abstraction has 210 states and 244 transitions. [2023-11-06 23:11:51,631 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 3.0) internal successors, (42), 15 states have internal predecessors, (42), 8 states have call successors, (24), 3 states have call predecessors, (24), 2 states have return successors, (22), 8 states have call predecessors, (22), 8 states have call successors, (22) [2023-11-06 23:11:51,632 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 244 transitions. [2023-11-06 23:11:51,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2023-11-06 23:11:51,633 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 23:11:51,633 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2023-11-06 23:11:51,640 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-06 23:11:51,840 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:11:51,840 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 23:11:51,840 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 23:11:51,840 INFO L85 PathProgramCache]: Analyzing trace with hash 1611798954, now seen corresponding path program 2 times [2023-11-06 23:11:51,840 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 23:11:51,840 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1453625827] [2023-11-06 23:11:51,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:11:51,841 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 23:11:51,862 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 23:11:51,863 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1240097689] [2023-11-06 23:11:51,863 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-06 23:11:51,864 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:11:51,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 [2023-11-06 23:11:51,865 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 23:11:51,874 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-06 23:11:51,952 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-06 23:11:51,952 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 23:11:51,955 INFO L262 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 45 conjunts are in the unsatisfiable core [2023-11-06 23:11:51,959 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 23:11:52,539 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 28 proven. 64 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2023-11-06 23:11:52,539 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 23:12:27,962 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 28 proven. 64 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2023-11-06 23:12:27,962 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 23:12:27,962 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1453625827] [2023-11-06 23:12:27,962 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 23:12:27,963 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1240097689] [2023-11-06 23:12:27,963 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1240097689] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 23:12:27,963 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 23:12:27,963 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 21 [2023-11-06 23:12:27,963 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669418316] [2023-11-06 23:12:27,964 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 23:12:27,964 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-11-06 23:12:27,964 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 23:12:27,965 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-11-06 23:12:27,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2023-11-06 23:12:27,966 INFO L87 Difference]: Start difference. First operand 210 states and 244 transitions. Second operand has 21 states, 21 states have (on average 2.5714285714285716) internal successors, (54), 19 states have internal predecessors, (54), 11 states have call successors, (28), 3 states have call predecessors, (28), 2 states have return successors, (26), 9 states have call predecessors, (26), 9 states have call successors, (26) [2023-11-06 23:12:53,160 WARN L293 SmtUtils]: Spent 24.58s on a formula simplification. DAG size of input: 168 DAG size of output: 83 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-11-06 23:12:55,860 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 [] [2023-11-06 23:12:57,418 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.56s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-06 23:13:03,699 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-06 23:13:06,102 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-06 23:13:08,159 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-06 23:13:09,526 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.32s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-06 23:13:12,135 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-06 23:13:15,678 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-06 23:13:17,680 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-06 23:13:19,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 23:13:19,292 INFO L93 Difference]: Finished difference Result 305 states and 389 transitions. [2023-11-06 23:13:19,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-06 23:13:19,293 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.5714285714285716) internal successors, (54), 19 states have internal predecessors, (54), 11 states have call successors, (28), 3 states have call predecessors, (28), 2 states have return successors, (26), 9 states have call predecessors, (26), 9 states have call successors, (26) Word has length 90 [2023-11-06 23:13:19,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 23:13:19,298 INFO L225 Difference]: With dead ends: 305 [2023-11-06 23:13:19,298 INFO L226 Difference]: Without dead ends: 261 [2023-11-06 23:13:19,299 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 159 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 34.6s TimeCoverageRelationStatistics Valid=151, Invalid=551, Unknown=0, NotChecked=0, Total=702 [2023-11-06 23:13:19,300 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 120 mSDsluCounter, 598 mSDsCounter, 0 mSdLazyCounter, 566 mSolverCounterSat, 115 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 651 SdHoareTripleChecker+Invalid, 688 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 566 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.6s IncrementalHoareTripleChecker+Time [2023-11-06 23:13:19,300 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [128 Valid, 651 Invalid, 688 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 566 Invalid, 7 Unknown, 0 Unchecked, 21.6s Time] [2023-11-06 23:13:19,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2023-11-06 23:13:19,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 247. [2023-11-06 23:13:19,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 247 states, 166 states have (on average 1.1987951807228916) internal successors, (199), 175 states have internal predecessors, (199), 54 states have call successors, (54), 26 states have call predecessors, (54), 26 states have return successors, (52), 45 states have call predecessors, (52), 52 states have call successors, (52) [2023-11-06 23:13:19,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 305 transitions. [2023-11-06 23:13:19,414 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 305 transitions. Word has length 90 [2023-11-06 23:13:19,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 23:13:19,414 INFO L495 AbstractCegarLoop]: Abstraction has 247 states and 305 transitions. [2023-11-06 23:13:19,414 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.5714285714285716) internal successors, (54), 19 states have internal predecessors, (54), 11 states have call successors, (28), 3 states have call predecessors, (28), 2 states have return successors, (26), 9 states have call predecessors, (26), 9 states have call successors, (26) [2023-11-06 23:13:19,415 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 305 transitions. [2023-11-06 23:13:19,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2023-11-06 23:13:19,416 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 23:13:19,416 INFO L195 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, 1, 1] [2023-11-06 23:13:19,426 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-06 23:13:19,621 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:13:19,622 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 23:13:19,622 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 23:13:19,622 INFO L85 PathProgramCache]: Analyzing trace with hash 1991126182, now seen corresponding path program 1 times [2023-11-06 23:13:19,622 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 23:13:19,622 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [732345892] [2023-11-06 23:13:19,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:13:19,622 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 23:13:19,632 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 23:13:19,633 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1010728273] [2023-11-06 23:13:19,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:13:19,633 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:13:19,633 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 [2023-11-06 23:13:19,634 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 23:13:19,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-06 23:13:19,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 23:13:19,712 INFO L262 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-06 23:13:19,715 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 23:13:19,847 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 120 proven. 260 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2023-11-06 23:13:19,848 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 23:13:19,997 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 28 proven. 44 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2023-11-06 23:13:19,998 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 23:13:19,998 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [732345892] [2023-11-06 23:13:19,998 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 23:13:19,998 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1010728273] [2023-11-06 23:13:19,998 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1010728273] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 23:13:19,998 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 23:13:19,998 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2023-11-06 23:13:19,998 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [830777854] [2023-11-06 23:13:19,998 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 23:13:19,999 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-06 23:13:19,999 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 23:13:20,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-06 23:13:20,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2023-11-06 23:13:20,000 INFO L87 Difference]: Start difference. First operand 247 states and 305 transitions. Second operand has 14 states, 14 states have (on average 4.071428571428571) internal successors, (57), 14 states have internal predecessors, (57), 9 states have call successors, (29), 6 states have call predecessors, (29), 6 states have return successors, (28), 9 states have call predecessors, (28), 9 states have call successors, (28) [2023-11-06 23:13:20,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 23:13:20,646 INFO L93 Difference]: Finished difference Result 707 states and 937 transitions. [2023-11-06 23:13:20,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-06 23:13:20,647 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.071428571428571) internal successors, (57), 14 states have internal predecessors, (57), 9 states have call successors, (29), 6 states have call predecessors, (29), 6 states have return successors, (28), 9 states have call predecessors, (28), 9 states have call successors, (28) Word has length 96 [2023-11-06 23:13:20,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 23:13:20,651 INFO L225 Difference]: With dead ends: 707 [2023-11-06 23:13:20,652 INFO L226 Difference]: Without dead ends: 629 [2023-11-06 23:13:20,653 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 178 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2023-11-06 23:13:20,655 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 159 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 188 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 23:13:20,655 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [159 Valid, 188 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 23:13:20,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 629 states. [2023-11-06 23:13:20,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 629 to 549. [2023-11-06 23:13:20,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 549 states, 362 states have (on average 1.270718232044199) internal successors, (460), 391 states have internal predecessors, (460), 134 states have call successors, (134), 53 states have call predecessors, (134), 52 states have return successors, (127), 104 states have call predecessors, (127), 127 states have call successors, (127) [2023-11-06 23:13:20,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 549 states to 549 states and 721 transitions. [2023-11-06 23:13:20,879 INFO L78 Accepts]: Start accepts. Automaton has 549 states and 721 transitions. Word has length 96 [2023-11-06 23:13:20,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 23:13:20,879 INFO L495 AbstractCegarLoop]: Abstraction has 549 states and 721 transitions. [2023-11-06 23:13:20,880 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.071428571428571) internal successors, (57), 14 states have internal predecessors, (57), 9 states have call successors, (29), 6 states have call predecessors, (29), 6 states have return successors, (28), 9 states have call predecessors, (28), 9 states have call successors, (28) [2023-11-06 23:13:20,880 INFO L276 IsEmpty]: Start isEmpty. Operand 549 states and 721 transitions. [2023-11-06 23:13:20,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2023-11-06 23:13:20,881 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 23:13:20,882 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 23:13:20,888 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-06 23:13:21,087 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:13:21,087 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 23:13:21,087 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 23:13:21,088 INFO L85 PathProgramCache]: Analyzing trace with hash -218084043, now seen corresponding path program 2 times [2023-11-06 23:13:21,088 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 23:13:21,088 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1092650225] [2023-11-06 23:13:21,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:13:21,088 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 23:13:21,098 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 23:13:21,098 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [636099810] [2023-11-06 23:13:21,098 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-06 23:13:21,098 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:13:21,098 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 [2023-11-06 23:13:21,105 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 23:13:21,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-11-06 23:13:21,184 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-06 23:13:21,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 23:13:21,187 INFO L262 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 49 conjunts are in the unsatisfiable core [2023-11-06 23:13:21,190 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 23:13:21,712 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 32 proven. 74 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2023-11-06 23:13:21,712 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 23:13:29,583 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 32 proven. 74 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2023-11-06 23:13:29,583 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 23:13:29,584 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1092650225] [2023-11-06 23:13:29,584 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 23:13:29,584 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [636099810] [2023-11-06 23:13:29,584 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [636099810] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 23:13:29,584 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 23:13:29,584 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 27 [2023-11-06 23:13:29,585 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1425523967] [2023-11-06 23:13:29,585 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 23:13:29,585 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-11-06 23:13:29,586 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 23:13:29,587 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-11-06 23:13:29,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=545, Unknown=0, NotChecked=0, Total=702 [2023-11-06 23:13:29,587 INFO L87 Difference]: Start difference. First operand 549 states and 721 transitions. Second operand has 27 states, 25 states have (on average 2.24) internal successors, (56), 25 states have internal predecessors, (56), 15 states have call successors, (32), 3 states have call predecessors, (32), 2 states have return successors, (30), 13 states have call predecessors, (30), 13 states have call successors, (30) [2023-11-06 23:13:32,716 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.13s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-06 23:13:36,736 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.76s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-06 23:13:39,411 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 [] [2023-11-06 23:13:42,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 23:13:42,173 INFO L93 Difference]: Finished difference Result 698 states and 919 transitions. [2023-11-06 23:13:42,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-11-06 23:13:42,174 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 25 states have (on average 2.24) internal successors, (56), 25 states have internal predecessors, (56), 15 states have call successors, (32), 3 states have call predecessors, (32), 2 states have return successors, (30), 13 states have call predecessors, (30), 13 states have call successors, (30) Word has length 101 [2023-11-06 23:13:42,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 23:13:42,178 INFO L225 Difference]: With dead ends: 698 [2023-11-06 23:13:42,178 INFO L226 Difference]: Without dead ends: 537 [2023-11-06 23:13:42,179 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 175 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=360, Invalid=1122, Unknown=0, NotChecked=0, Total=1482 [2023-11-06 23:13:42,180 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 98 mSDsluCounter, 428 mSDsCounter, 0 mSdLazyCounter, 530 mSolverCounterSat, 120 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 468 SdHoareTripleChecker+Invalid, 651 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 530 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.3s IncrementalHoareTripleChecker+Time [2023-11-06 23:13:42,180 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [101 Valid, 468 Invalid, 651 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 530 Invalid, 1 Unknown, 0 Unchecked, 6.3s Time] [2023-11-06 23:13:42,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 537 states. [2023-11-06 23:13:42,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 537 to 497. [2023-11-06 23:13:42,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 497 states, 327 states have (on average 1.2201834862385321) internal successors, (399), 352 states have internal predecessors, (399), 116 states have call successors, (116), 53 states have call predecessors, (116), 53 states have return successors, (110), 91 states have call predecessors, (110), 110 states have call successors, (110) [2023-11-06 23:13:42,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 497 states to 497 states and 625 transitions. [2023-11-06 23:13:42,462 INFO L78 Accepts]: Start accepts. Automaton has 497 states and 625 transitions. Word has length 101 [2023-11-06 23:13:42,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 23:13:42,463 INFO L495 AbstractCegarLoop]: Abstraction has 497 states and 625 transitions. [2023-11-06 23:13:42,463 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 25 states have (on average 2.24) internal successors, (56), 25 states have internal predecessors, (56), 15 states have call successors, (32), 3 states have call predecessors, (32), 2 states have return successors, (30), 13 states have call predecessors, (30), 13 states have call successors, (30) [2023-11-06 23:13:42,463 INFO L276 IsEmpty]: Start isEmpty. Operand 497 states and 625 transitions. [2023-11-06 23:13:42,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2023-11-06 23:13:42,465 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 23:13:42,465 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 23:13:42,471 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-11-06 23:13:42,671 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:13:42,671 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 23:13:42,672 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 23:13:42,672 INFO L85 PathProgramCache]: Analyzing trace with hash -1246855822, now seen corresponding path program 1 times [2023-11-06 23:13:42,672 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 23:13:42,672 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [48501460] [2023-11-06 23:13:42,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:13:42,673 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 23:13:42,686 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 23:13:42,686 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [827743352] [2023-11-06 23:13:42,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:13:42,687 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:13:42,687 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 [2023-11-06 23:13:42,688 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 23:13:42,717 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-11-06 23:13:42,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 23:13:42,773 INFO L262 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-06 23:13:42,775 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 23:13:42,956 INFO L134 CoverageAnalysis]: Checked inductivity of 492 backedges. 30 proven. 414 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-11-06 23:13:42,956 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 23:13:43,140 INFO L134 CoverageAnalysis]: Checked inductivity of 492 backedges. 30 proven. 42 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2023-11-06 23:13:43,140 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 23:13:43,140 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [48501460] [2023-11-06 23:13:43,140 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 23:13:43,140 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [827743352] [2023-11-06 23:13:43,141 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [827743352] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 23:13:43,141 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 23:13:43,141 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 18 [2023-11-06 23:13:43,141 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33990683] [2023-11-06 23:13:43,141 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 23:13:43,142 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-06 23:13:43,142 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 23:13:43,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-06 23:13:43,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=181, Unknown=0, NotChecked=0, Total=306 [2023-11-06 23:13:43,143 INFO L87 Difference]: Start difference. First operand 497 states and 625 transitions. Second operand has 18 states, 18 states have (on average 4.111111111111111) internal successors, (74), 18 states have internal predecessors, (74), 13 states have call successors, (31), 8 states have call predecessors, (31), 7 states have return successors, (30), 12 states have call predecessors, (30), 12 states have call successors, (30) [2023-11-06 23:13:44,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 23:13:44,101 INFO L93 Difference]: Finished difference Result 930 states and 1211 transitions. [2023-11-06 23:13:44,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-11-06 23:13:44,102 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 4.111111111111111) internal successors, (74), 18 states have internal predecessors, (74), 13 states have call successors, (31), 8 states have call predecessors, (31), 7 states have return successors, (30), 12 states have call predecessors, (30), 12 states have call successors, (30) Word has length 104 [2023-11-06 23:13:44,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 23:13:44,106 INFO L225 Difference]: With dead ends: 930 [2023-11-06 23:13:44,107 INFO L226 Difference]: Without dead ends: 893 [2023-11-06 23:13:44,108 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=259, Invalid=497, Unknown=0, NotChecked=0, Total=756 [2023-11-06 23:13:44,108 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 237 mSDsluCounter, 198 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 237 SdHoareTripleChecker+Valid, 227 SdHoareTripleChecker+Invalid, 264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-06 23:13:44,109 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [237 Valid, 227 Invalid, 264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-06 23:13:44,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 893 states. [2023-11-06 23:13:44,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 893 to 878. [2023-11-06 23:13:44,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 878 states, 586 states have (on average 1.1501706484641638) internal successors, (674), 625 states have internal predecessors, (674), 210 states have call successors, (210), 82 states have call predecessors, (210), 81 states have return successors, (201), 170 states have call predecessors, (201), 201 states have call successors, (201) [2023-11-06 23:13:44,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 878 states to 878 states and 1085 transitions. [2023-11-06 23:13:44,630 INFO L78 Accepts]: Start accepts. Automaton has 878 states and 1085 transitions. Word has length 104 [2023-11-06 23:13:44,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 23:13:44,630 INFO L495 AbstractCegarLoop]: Abstraction has 878 states and 1085 transitions. [2023-11-06 23:13:44,631 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 4.111111111111111) internal successors, (74), 18 states have internal predecessors, (74), 13 states have call successors, (31), 8 states have call predecessors, (31), 7 states have return successors, (30), 12 states have call predecessors, (30), 12 states have call successors, (30) [2023-11-06 23:13:44,631 INFO L276 IsEmpty]: Start isEmpty. Operand 878 states and 1085 transitions. [2023-11-06 23:13:44,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2023-11-06 23:13:44,633 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 23:13:44,633 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 17, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 23:13:44,645 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-11-06 23:13:44,838 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-11-06 23:13:44,839 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 23:13:44,839 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 23:13:44,839 INFO L85 PathProgramCache]: Analyzing trace with hash -562359451, now seen corresponding path program 1 times [2023-11-06 23:13:44,839 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 23:13:44,839 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1231804663] [2023-11-06 23:13:44,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:13:44,839 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 23:13:44,850 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 23:13:44,850 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [766988495] [2023-11-06 23:13:44,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:13:44,850 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:13:44,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 [2023-11-06 23:13:44,858 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 23:13:44,859 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-11-06 23:13:44,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 23:13:44,940 INFO L262 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-06 23:13:44,942 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 23:13:45,065 INFO L134 CoverageAnalysis]: Checked inductivity of 629 backedges. 321 proven. 0 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2023-11-06 23:13:45,066 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 23:13:45,066 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 23:13:45,066 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1231804663] [2023-11-06 23:13:45,066 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 23:13:45,066 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [766988495] [2023-11-06 23:13:45,066 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [766988495] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 23:13:45,066 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 23:13:45,066 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-06 23:13:45,067 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956980410] [2023-11-06 23:13:45,067 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 23:13:45,067 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-06 23:13:45,067 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 23:13:45,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-06 23:13:45,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2023-11-06 23:13:45,068 INFO L87 Difference]: Start difference. First operand 878 states and 1085 transitions. Second operand has 6 states, 6 states have (on average 4.833333333333333) internal successors, (29), 6 states have internal predecessors, (29), 4 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) [2023-11-06 23:13:45,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 23:13:45,551 INFO L93 Difference]: Finished difference Result 1135 states and 1376 transitions. [2023-11-06 23:13:45,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 23:13:45,552 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.833333333333333) internal successors, (29), 6 states have internal predecessors, (29), 4 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) Word has length 115 [2023-11-06 23:13:45,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 23:13:45,556 INFO L225 Difference]: With dead ends: 1135 [2023-11-06 23:13:45,556 INFO L226 Difference]: Without dead ends: 691 [2023-11-06 23:13:45,558 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-11-06 23:13:45,559 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 17 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 23:13:45,559 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 124 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 23:13:45,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 691 states. [2023-11-06 23:13:46,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 691 to 672. [2023-11-06 23:13:46,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 672 states, 450 states have (on average 1.1177777777777778) internal successors, (503), 473 states have internal predecessors, (503), 144 states have call successors, (144), 78 states have call predecessors, (144), 77 states have return successors, (135), 120 states have call predecessors, (135), 135 states have call successors, (135) [2023-11-06 23:13:46,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 672 states to 672 states and 782 transitions. [2023-11-06 23:13:46,092 INFO L78 Accepts]: Start accepts. Automaton has 672 states and 782 transitions. Word has length 115 [2023-11-06 23:13:46,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 23:13:46,092 INFO L495 AbstractCegarLoop]: Abstraction has 672 states and 782 transitions. [2023-11-06 23:13:46,093 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.833333333333333) internal successors, (29), 6 states have internal predecessors, (29), 4 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) [2023-11-06 23:13:46,093 INFO L276 IsEmpty]: Start isEmpty. Operand 672 states and 782 transitions. [2023-11-06 23:13:46,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2023-11-06 23:13:46,095 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 23:13:46,095 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 18, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 23:13:46,110 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2023-11-06 23:13:46,301 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:13:46,302 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 23:13:46,302 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 23:13:46,302 INFO L85 PathProgramCache]: Analyzing trace with hash 376342762, now seen corresponding path program 2 times [2023-11-06 23:13:46,302 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 23:13:46,303 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [28042054] [2023-11-06 23:13:46,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:13:46,303 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 23:13:46,314 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 23:13:46,314 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2105466034] [2023-11-06 23:13:46,314 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-06 23:13:46,314 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:13:46,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 [2023-11-06 23:13:46,315 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 23:13:46,341 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-11-06 23:13:46,413 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-06 23:13:46,413 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 23:13:46,415 INFO L262 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-06 23:13:46,418 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 23:13:46,517 INFO L134 CoverageAnalysis]: Checked inductivity of 700 backedges. 72 proven. 16 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2023-11-06 23:13:46,517 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 23:13:46,686 INFO L134 CoverageAnalysis]: Checked inductivity of 700 backedges. 72 proven. 16 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2023-11-06 23:13:46,686 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 23:13:46,686 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [28042054] [2023-11-06 23:13:46,687 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 23:13:46,687 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2105466034] [2023-11-06 23:13:46,687 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2105466034] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 23:13:46,687 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 23:13:46,687 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2023-11-06 23:13:46,688 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782655470] [2023-11-06 23:13:46,688 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 23:13:46,688 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-06 23:13:46,688 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 23:13:46,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-06 23:13:46,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2023-11-06 23:13:46,689 INFO L87 Difference]: Start difference. First operand 672 states and 782 transitions. Second operand has 6 states, 6 states have (on average 5.166666666666667) internal successors, (31), 6 states have internal predecessors, (31), 5 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) [2023-11-06 23:13:47,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 23:13:47,273 INFO L93 Difference]: Finished difference Result 721 states and 839 transitions. [2023-11-06 23:13:47,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 23:13:47,274 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.166666666666667) internal successors, (31), 6 states have internal predecessors, (31), 5 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) Word has length 119 [2023-11-06 23:13:47,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 23:13:47,279 INFO L225 Difference]: With dead ends: 721 [2023-11-06 23:13:47,279 INFO L226 Difference]: Without dead ends: 681 [2023-11-06 23:13:47,280 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 226 SyntacticMatches, 6 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2023-11-06 23:13:47,280 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 12 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 23:13:47,281 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 132 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 23:13:47,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 681 states. [2023-11-06 23:13:47,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 681 to 660. [2023-11-06 23:13:47,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 660 states, 447 states have (on average 1.116331096196868) internal successors, (499), 471 states have internal predecessors, (499), 135 states have call successors, (135), 77 states have call predecessors, (135), 77 states have return successors, (127), 111 states have call predecessors, (127), 127 states have call successors, (127) [2023-11-06 23:13:47,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 660 states to 660 states and 761 transitions. [2023-11-06 23:13:47,693 INFO L78 Accepts]: Start accepts. Automaton has 660 states and 761 transitions. Word has length 119 [2023-11-06 23:13:47,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 23:13:47,694 INFO L495 AbstractCegarLoop]: Abstraction has 660 states and 761 transitions. [2023-11-06 23:13:47,694 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.166666666666667) internal successors, (31), 6 states have internal predecessors, (31), 5 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) [2023-11-06 23:13:47,694 INFO L276 IsEmpty]: Start isEmpty. Operand 660 states and 761 transitions. [2023-11-06 23:13:47,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2023-11-06 23:13:47,696 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 23:13:47,696 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 18, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2023-11-06 23:13:47,710 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2023-11-06 23:13:47,901 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-11-06 23:13:47,902 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 23:13:47,902 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 23:13:47,902 INFO L85 PathProgramCache]: Analyzing trace with hash -405037921, now seen corresponding path program 3 times [2023-11-06 23:13:47,902 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 23:13:47,902 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1432074206] [2023-11-06 23:13:47,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:13:47,903 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 23:13:47,913 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 23:13:47,913 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [235607349] [2023-11-06 23:13:47,913 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 23:13:47,913 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:13:47,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 [2023-11-06 23:13:47,914 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 23:13:47,918 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-11-06 23:13:48,010 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-06 23:13:48,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 23:13:48,012 INFO L262 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 29 conjunts are in the unsatisfiable core [2023-11-06 23:13:48,016 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 23:13:48,204 INFO L134 CoverageAnalysis]: Checked inductivity of 711 backedges. 145 proven. 2 refuted. 0 times theorem prover too weak. 564 trivial. 0 not checked. [2023-11-06 23:13:48,204 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 23:13:54,441 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 23:13:54,442 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1432074206] [2023-11-06 23:13:54,442 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 23:13:54,442 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [235607349] [2023-11-06 23:13:54,442 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [235607349] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 23:13:54,442 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-11-06 23:13:54,442 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2023-11-06 23:13:54,443 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160832655] [2023-11-06 23:13:54,443 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-11-06 23:13:54,443 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-06 23:13:54,443 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 23:13:54,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-06 23:13:54,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=144, Unknown=1, NotChecked=0, Total=182 [2023-11-06 23:13:54,444 INFO L87 Difference]: Start difference. First operand 660 states and 761 transitions. Second operand has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 3 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-06 23:13:55,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 23:13:55,078 INFO L93 Difference]: Finished difference Result 690 states and 790 transitions. [2023-11-06 23:13:55,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-06 23:13:55,079 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 3 states have call predecessors, (7), 2 states have call successors, (7) Word has length 122 [2023-11-06 23:13:55,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 23:13:55,084 INFO L225 Difference]: With dead ends: 690 [2023-11-06 23:13:55,084 INFO L226 Difference]: Without dead ends: 676 [2023-11-06 23:13:55,085 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=50, Invalid=189, Unknown=1, NotChecked=0, Total=240 [2023-11-06 23:13:55,086 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 30 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 23:13:55,086 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 75 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 23:13:55,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 676 states. [2023-11-06 23:13:55,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 676 to 661. [2023-11-06 23:13:55,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 661 states, 452 states have (on average 1.1017699115044248) internal successors, (498), 470 states have internal predecessors, (498), 130 states have call successors, (130), 79 states have call predecessors, (130), 78 states have return successors, (127), 111 states have call predecessors, (127), 127 states have call successors, (127) [2023-11-06 23:13:55,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 661 states to 661 states and 755 transitions. [2023-11-06 23:13:55,551 INFO L78 Accepts]: Start accepts. Automaton has 661 states and 755 transitions. Word has length 122 [2023-11-06 23:13:55,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 23:13:55,552 INFO L495 AbstractCegarLoop]: Abstraction has 661 states and 755 transitions. [2023-11-06 23:13:55,552 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 3 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-06 23:13:55,552 INFO L276 IsEmpty]: Start isEmpty. Operand 661 states and 755 transitions. [2023-11-06 23:13:55,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2023-11-06 23:13:55,554 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 23:13:55,555 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 23:13:55,565 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-11-06 23:13:55,760 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-11-06 23:13:55,761 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 23:13:55,761 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 23:13:55,761 INFO L85 PathProgramCache]: Analyzing trace with hash 1989463840, now seen corresponding path program 3 times [2023-11-06 23:13:55,761 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 23:13:55,761 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [509439041] [2023-11-06 23:13:55,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:13:55,761 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 23:13:55,771 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 23:13:55,771 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [539732456] [2023-11-06 23:13:55,772 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 23:13:55,772 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:13:55,772 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 [2023-11-06 23:13:55,778 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 23:13:55,785 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-11-06 23:13:55,851 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-06 23:13:55,851 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 23:13:55,852 INFO L262 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 27 conjunts are in the unsatisfiable core [2023-11-06 23:13:55,855 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 23:13:56,058 INFO L134 CoverageAnalysis]: Checked inductivity of 869 backedges. 163 proven. 56 refuted. 0 times theorem prover too weak. 650 trivial. 0 not checked. [2023-11-06 23:13:56,058 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 23:13:56,256 INFO L134 CoverageAnalysis]: Checked inductivity of 869 backedges. 152 proven. 2 refuted. 0 times theorem prover too weak. 715 trivial. 0 not checked. [2023-11-06 23:13:56,256 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 23:13:56,257 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [509439041] [2023-11-06 23:13:56,257 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 23:13:56,257 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [539732456] [2023-11-06 23:13:56,257 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [539732456] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 23:13:56,257 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 23:13:56,257 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 16 [2023-11-06 23:13:56,257 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2017115605] [2023-11-06 23:13:56,257 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 23:13:56,258 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-06 23:13:56,258 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 23:13:56,259 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-06 23:13:56,259 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2023-11-06 23:13:56,259 INFO L87 Difference]: Start difference. First operand 661 states and 755 transitions. Second operand has 16 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 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) [2023-11-06 23:13:56,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 23:13:56,994 INFO L93 Difference]: Finished difference Result 668 states and 761 transitions. [2023-11-06 23:13:56,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-06 23:13:56,994 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 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 133 [2023-11-06 23:13:56,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 23:13:56,999 INFO L225 Difference]: With dead ends: 668 [2023-11-06 23:13:56,999 INFO L226 Difference]: Without dead ends: 658 [2023-11-06 23:13:57,000 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 252 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=398, Unknown=0, NotChecked=0, Total=506 [2023-11-06 23:13:57,001 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 92 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 23:13:57,001 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [92 Valid, 113 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 23:13:57,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 658 states. [2023-11-06 23:13:57,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 658 to 487. [2023-11-06 23:13:57,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 487 states, 332 states have (on average 1.0843373493975903) internal successors, (360), 342 states have internal predecessors, (360), 91 states have call successors, (91), 63 states have call predecessors, (91), 63 states have return successors, (90), 81 states have call predecessors, (90), 90 states have call successors, (90) [2023-11-06 23:13:57,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 541 transitions. [2023-11-06 23:13:57,402 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 541 transitions. Word has length 133 [2023-11-06 23:13:57,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 23:13:57,403 INFO L495 AbstractCegarLoop]: Abstraction has 487 states and 541 transitions. [2023-11-06 23:13:57,403 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 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) [2023-11-06 23:13:57,403 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 541 transitions. [2023-11-06 23:13:57,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 221 [2023-11-06 23:13:57,407 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 23:13:57,407 INFO L195 NwaCegarLoop]: trace histogram [33, 32, 32, 11, 10, 10, 10, 10, 10, 10, 10, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 23:13:57,417 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2023-11-06 23:13:57,613 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:13:57,613 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 23:13:57,613 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 23:13:57,614 INFO L85 PathProgramCache]: Analyzing trace with hash 888958317, now seen corresponding path program 1 times [2023-11-06 23:13:57,614 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 23:13:57,614 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [695767863] [2023-11-06 23:13:57,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:13:57,614 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 23:13:57,634 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 23:13:57,634 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [535205490] [2023-11-06 23:13:57,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:13:57,634 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:13:57,635 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 [2023-11-06 23:13:57,636 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 23:13:57,657 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-11-06 23:13:57,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 23:13:57,787 INFO L262 TraceCheckSpWp]: Trace formula consists of 539 conjuncts, 31 conjunts are in the unsatisfiable core [2023-11-06 23:13:57,793 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 23:13:58,244 INFO L134 CoverageAnalysis]: Checked inductivity of 2374 backedges. 64 proven. 2222 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2023-11-06 23:13:58,244 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 23:13:58,793 INFO L134 CoverageAnalysis]: Checked inductivity of 2374 backedges. 64 proven. 326 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2023-11-06 23:13:58,793 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 23:13:58,793 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [695767863] [2023-11-06 23:13:58,793 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 23:13:58,793 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [535205490] [2023-11-06 23:13:58,794 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [535205490] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 23:13:58,794 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 23:13:58,794 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18] total 34 [2023-11-06 23:13:58,794 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549407944] [2023-11-06 23:13:58,794 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 23:13:58,795 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2023-11-06 23:13:58,795 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 23:13:58,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2023-11-06 23:13:58,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=501, Invalid=621, Unknown=0, NotChecked=0, Total=1122 [2023-11-06 23:13:58,797 INFO L87 Difference]: Start difference. First operand 487 states and 541 transitions. Second operand has 34 states, 34 states have (on average 4.705882352941177) internal successors, (160), 34 states have internal predecessors, (160), 29 states have call successors, (65), 16 states have call predecessors, (65), 15 states have return successors, (64), 28 states have call predecessors, (64), 28 states have call successors, (64) [2023-11-06 23:14:01,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 23:14:01,027 INFO L93 Difference]: Finished difference Result 1157 states and 1355 transitions. [2023-11-06 23:14:01,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2023-11-06 23:14:01,028 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 4.705882352941177) internal successors, (160), 34 states have internal predecessors, (160), 29 states have call successors, (65), 16 states have call predecessors, (65), 15 states have return successors, (64), 28 states have call predecessors, (64), 28 states have call successors, (64) Word has length 220 [2023-11-06 23:14:01,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 23:14:01,034 INFO L225 Difference]: With dead ends: 1157 [2023-11-06 23:14:01,034 INFO L226 Difference]: Without dead ends: 1144 [2023-11-06 23:14:01,036 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 463 GetRequests, 406 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 434 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1212, Invalid=2210, Unknown=0, NotChecked=0, Total=3422 [2023-11-06 23:14:01,037 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 611 mSDsluCounter, 372 mSDsCounter, 0 mSdLazyCounter, 383 mSolverCounterSat, 336 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 611 SdHoareTripleChecker+Valid, 400 SdHoareTripleChecker+Invalid, 719 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 336 IncrementalHoareTripleChecker+Valid, 383 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-06 23:14:01,037 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [611 Valid, 400 Invalid, 719 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [336 Valid, 383 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-06 23:14:01,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1144 states. [2023-11-06 23:14:02,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1144 to 1143. [2023-11-06 23:14:02,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1143 states, 780 states have (on average 1.0974358974358975) internal successors, (856), 806 states have internal predecessors, (856), 219 states have call successors, (219), 143 states have call predecessors, (219), 143 states have return successors, (218), 193 states have call predecessors, (218), 218 states have call successors, (218) [2023-11-06 23:14:02,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1143 states to 1143 states and 1293 transitions. [2023-11-06 23:14:02,138 INFO L78 Accepts]: Start accepts. Automaton has 1143 states and 1293 transitions. Word has length 220 [2023-11-06 23:14:02,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 23:14:02,138 INFO L495 AbstractCegarLoop]: Abstraction has 1143 states and 1293 transitions. [2023-11-06 23:14:02,139 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 4.705882352941177) internal successors, (160), 34 states have internal predecessors, (160), 29 states have call successors, (65), 16 states have call predecessors, (65), 15 states have return successors, (64), 28 states have call predecessors, (64), 28 states have call successors, (64) [2023-11-06 23:14:02,139 INFO L276 IsEmpty]: Start isEmpty. Operand 1143 states and 1293 transitions. [2023-11-06 23:14:02,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 445 [2023-11-06 23:14:02,150 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 23:14:02,150 INFO L195 NwaCegarLoop]: trace histogram [65, 64, 64, 27, 26, 26, 26, 26, 26, 26, 26, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 23:14:02,162 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2023-11-06 23:14:02,356 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:14:02,356 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 23:14:02,357 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 23:14:02,357 INFO L85 PathProgramCache]: Analyzing trace with hash 1525085741, now seen corresponding path program 2 times [2023-11-06 23:14:02,357 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 23:14:02,357 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [294025544] [2023-11-06 23:14:02,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:14:02,358 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 23:14:02,403 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 23:14:02,403 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1338899417] [2023-11-06 23:14:02,403 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-06 23:14:02,404 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:14:02,404 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 [2023-11-06 23:14:02,405 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 23:14:02,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-11-06 23:14:02,661 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-06 23:14:02,661 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 23:14:02,666 INFO L262 TraceCheckSpWp]: Trace formula consists of 1067 conjuncts, 63 conjunts are in the unsatisfiable core [2023-11-06 23:14:02,677 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 23:14:03,668 INFO L134 CoverageAnalysis]: Checked inductivity of 10230 backedges. 128 proven. 9950 refuted. 0 times theorem prover too weak. 152 trivial. 0 not checked. [2023-11-06 23:14:03,669 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 23:14:05,077 INFO L134 CoverageAnalysis]: Checked inductivity of 10230 backedges. 128 proven. 2038 refuted. 0 times theorem prover too weak. 8064 trivial. 0 not checked. [2023-11-06 23:14:05,077 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 23:14:05,078 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [294025544] [2023-11-06 23:14:05,078 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 23:14:05,078 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1338899417] [2023-11-06 23:14:05,078 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1338899417] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 23:14:05,078 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 23:14:05,079 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 34] total 54 [2023-11-06 23:14:05,079 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213906248] [2023-11-06 23:14:05,079 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 23:14:05,083 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2023-11-06 23:14:05,083 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 23:14:05,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2023-11-06 23:14:05,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1331, Invalid=1531, Unknown=0, NotChecked=0, Total=2862 [2023-11-06 23:14:05,089 INFO L87 Difference]: Start difference. First operand 1143 states and 1293 transitions. Second operand has 54 states, 54 states have (on average 5.703703703703703) internal successors, (308), 54 states have internal predecessors, (308), 50 states have call successors, (129), 32 states have call predecessors, (129), 31 states have return successors, (128), 49 states have call predecessors, (128), 49 states have call successors, (128) [2023-11-06 23:14:09,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 23:14:09,696 INFO L93 Difference]: Finished difference Result 1977 states and 2307 transitions. [2023-11-06 23:14:09,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2023-11-06 23:14:09,697 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 5.703703703703703) internal successors, (308), 54 states have internal predecessors, (308), 50 states have call successors, (129), 32 states have call predecessors, (129), 31 states have return successors, (128), 49 states have call predecessors, (128), 49 states have call successors, (128) Word has length 444 [2023-11-06 23:14:09,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 23:14:09,709 INFO L225 Difference]: With dead ends: 1977 [2023-11-06 23:14:09,709 INFO L226 Difference]: Without dead ends: 1964 [2023-11-06 23:14:09,714 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 931 GetRequests, 822 SyntacticMatches, 12 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1516 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=3518, Invalid=6184, Unknown=0, NotChecked=0, Total=9702 [2023-11-06 23:14:09,714 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 975 mSDsluCounter, 541 mSDsCounter, 0 mSdLazyCounter, 631 mSolverCounterSat, 593 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 975 SdHoareTripleChecker+Valid, 569 SdHoareTripleChecker+Invalid, 1224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 593 IncrementalHoareTripleChecker+Valid, 631 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2023-11-06 23:14:09,715 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [975 Valid, 569 Invalid, 1224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [593 Valid, 631 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2023-11-06 23:14:09,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1964 states. [2023-11-06 23:14:11,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1964 to 1963. [2023-11-06 23:14:11,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1963 states, 1340 states have (on average 1.1014925373134328) internal successors, (1476), 1386 states have internal predecessors, (1476), 379 states have call successors, (379), 243 states have call predecessors, (379), 243 states have return successors, (378), 333 states have call predecessors, (378), 378 states have call successors, (378) [2023-11-06 23:14:11,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1963 states to 1963 states and 2233 transitions. [2023-11-06 23:14:11,495 INFO L78 Accepts]: Start accepts. Automaton has 1963 states and 2233 transitions. Word has length 444 [2023-11-06 23:14:11,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 23:14:11,496 INFO L495 AbstractCegarLoop]: Abstraction has 1963 states and 2233 transitions. [2023-11-06 23:14:11,496 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 5.703703703703703) internal successors, (308), 54 states have internal predecessors, (308), 50 states have call successors, (129), 32 states have call predecessors, (129), 31 states have return successors, (128), 49 states have call predecessors, (128), 49 states have call successors, (128) [2023-11-06 23:14:11,496 INFO L276 IsEmpty]: Start isEmpty. Operand 1963 states and 2233 transitions. [2023-11-06 23:14:11,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 725 [2023-11-06 23:14:11,525 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 23:14:11,525 INFO L195 NwaCegarLoop]: trace histogram [105, 104, 104, 47, 46, 46, 46, 46, 46, 46, 46, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 23:14:11,534 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2023-11-06 23:14:11,732 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:14:11,733 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 23:14:11,733 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 23:14:11,733 INFO L85 PathProgramCache]: Analyzing trace with hash -554493667, now seen corresponding path program 3 times [2023-11-06 23:14:11,734 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 23:14:11,734 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1112386598] [2023-11-06 23:14:11,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:14:11,734 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 23:14:11,781 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 23:14:11,781 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [263656805] [2023-11-06 23:14:11,781 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 23:14:11,781 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:14:11,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 [2023-11-06 23:14:11,782 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 23:14:11,813 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-11-06 23:14:25,226 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 68 check-sat command(s) [2023-11-06 23:14:25,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 23:14:25,262 INFO L262 TraceCheckSpWp]: Trace formula consists of 1652 conjuncts, 27 conjunts are in the unsatisfiable core [2023-11-06 23:14:25,277 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 23:14:25,494 INFO L134 CoverageAnalysis]: Checked inductivity of 27970 backedges. 7737 proven. 69 refuted. 0 times theorem prover too weak. 20164 trivial. 0 not checked. [2023-11-06 23:14:25,494 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 23:14:26,017 INFO L134 CoverageAnalysis]: Checked inductivity of 27970 backedges. 1185 proven. 69 refuted. 0 times theorem prover too weak. 26716 trivial. 0 not checked. [2023-11-06 23:14:26,017 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 23:14:26,017 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1112386598] [2023-11-06 23:14:26,017 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-06 23:14:26,017 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [263656805] [2023-11-06 23:14:26,018 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [263656805] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 23:14:26,018 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 23:14:26,018 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 12 [2023-11-06 23:14:26,019 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176475008] [2023-11-06 23:14:26,019 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 23:14:26,020 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-06 23:14:26,020 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 23:14:26,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-06 23:14:26,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2023-11-06 23:14:26,021 INFO L87 Difference]: Start difference. First operand 1963 states and 2233 transitions. Second operand has 12 states, 12 states have (on average 5.5) internal successors, (66), 12 states have internal predecessors, (66), 11 states have call successors, (43), 2 states have call predecessors, (43), 2 states have return successors, (42), 11 states have call predecessors, (42), 11 states have call successors, (42) [2023-11-06 23:14:27,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 23:14:27,715 INFO L93 Difference]: Finished difference Result 2704 states and 3067 transitions. [2023-11-06 23:14:27,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 23:14:27,719 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 5.5) internal successors, (66), 12 states have internal predecessors, (66), 11 states have call successors, (43), 2 states have call predecessors, (43), 2 states have return successors, (42), 11 states have call predecessors, (42), 11 states have call successors, (42) Word has length 724 [2023-11-06 23:14:27,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 23:14:27,729 INFO L225 Difference]: With dead ends: 2704 [2023-11-06 23:14:27,730 INFO L226 Difference]: Without dead ends: 1940 [2023-11-06 23:14:27,732 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1446 GetRequests, 1435 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2023-11-06 23:14:27,733 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 11 mSDsluCounter, 391 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 459 SdHoareTripleChecker+Invalid, 256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 23:14:27,734 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 459 Invalid, 256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 23:14:27,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1940 states. [2023-11-06 23:14:29,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1940 to 1940. [2023-11-06 23:14:29,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1940 states, 1324 states have (on average 1.1012084592145015) internal successors, (1458), 1369 states have internal predecessors, (1458), 374 states have call successors, (374), 241 states have call predecessors, (374), 241 states have return successors, (373), 329 states have call predecessors, (373), 373 states have call successors, (373) [2023-11-06 23:14:29,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1940 states to 1940 states and 2205 transitions. [2023-11-06 23:14:29,062 INFO L78 Accepts]: Start accepts. Automaton has 1940 states and 2205 transitions. Word has length 724 [2023-11-06 23:14:29,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 23:14:29,062 INFO L495 AbstractCegarLoop]: Abstraction has 1940 states and 2205 transitions. [2023-11-06 23:14:29,063 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 5.5) internal successors, (66), 12 states have internal predecessors, (66), 11 states have call successors, (43), 2 states have call predecessors, (43), 2 states have return successors, (42), 11 states have call predecessors, (42), 11 states have call successors, (42) [2023-11-06 23:14:29,063 INFO L276 IsEmpty]: Start isEmpty. Operand 1940 states and 2205 transitions. [2023-11-06 23:14:29,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 729 [2023-11-06 23:14:29,075 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 23:14:29,075 INFO L195 NwaCegarLoop]: trace histogram [106, 105, 105, 46, 45, 45, 45, 45, 45, 45, 45, 5, 5, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 23:14:29,097 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-11-06 23:14:29,296 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2023-11-06 23:14:29,296 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 23:14:29,296 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 23:14:29,296 INFO L85 PathProgramCache]: Analyzing trace with hash 1342293370, now seen corresponding path program 4 times [2023-11-06 23:14:29,297 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 23:14:29,297 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476663120] [2023-11-06 23:14:29,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 23:14:29,297 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 23:14:29,332 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-06 23:14:29,333 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2106096072] [2023-11-06 23:14:29,333 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-06 23:14:29,333 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 23:14:29,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 [2023-11-06 23:14:29,334 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 23:14:29,342 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f58d8305-f18b-4d52-949b-02ebd0d97188/bin/uautomizer-verify-WvqO1wxjHP/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process