/usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.use.bitabs.translation true -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -i ../../../trunk/examples/svcomp/hardness-nfm22/hardness_loopvsstraightlinecode_100-while_file-22.i -------------------------------------------------------------------------------- This is Ultimate 0.2.4-tmp.fs.bitabs-eval-d9c3e40-m [2023-12-15 20:49:44,661 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-15 20:49:44,708 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2023-12-15 20:49:44,712 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-15 20:49:44,712 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-15 20:49:44,744 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-15 20:49:44,745 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-15 20:49:44,745 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-15 20:49:44,745 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2023-12-15 20:49:44,752 INFO L153 SettingsManager]: * Use memory slicer=true [2023-12-15 20:49:44,752 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-15 20:49:44,752 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-15 20:49:44,753 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-12-15 20:49:44,753 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-12-15 20:49:44,753 INFO L153 SettingsManager]: * Use SBE=true [2023-12-15 20:49:44,753 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-15 20:49:44,753 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-15 20:49:44,754 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-15 20:49:44,754 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-15 20:49:44,754 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-15 20:49:44,754 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-15 20:49:44,755 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-15 20:49:44,755 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-15 20:49:44,755 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-15 20:49:44,755 INFO L153 SettingsManager]: * Allow undefined functions=false [2023-12-15 20:49:44,756 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-15 20:49:44,756 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-15 20:49:44,756 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-15 20:49:44,756 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-15 20:49:44,756 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-12-15 20:49:44,757 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-15 20:49:44,757 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-15 20:49:44,757 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2023-12-15 20:49:44,757 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-15 20:49:44,758 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-15 20:49:44,758 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-15 20:49:44,758 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-12-15 20:49:44,758 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-15 20:49:44,758 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-15 20:49:44,758 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-12-15 20:49:44,758 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-15 20:49:44,758 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-12-15 20:49:44,759 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-15 20:49:44,759 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:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Use bitabs translation -> true [2023-12-15 20:49:44,934 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-15 20:49:44,946 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-15 20:49:44,948 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-15 20:49:44,948 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-15 20:49:44,949 INFO L274 PluginConnector]: CDTParser initialized [2023-12-15 20:49:44,949 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/hardness-nfm22/hardness_loopvsstraightlinecode_100-while_file-22.i [2023-12-15 20:49:45,882 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-15 20:49:46,039 INFO L384 CDTParser]: Found 1 translation units. [2023-12-15 20:49:46,039 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/hardness-nfm22/hardness_loopvsstraightlinecode_100-while_file-22.i [2023-12-15 20:49:46,046 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d92091158/f2e15b2710834ffc92d191ea785c09f0/FLAGd72623112 [2023-12-15 20:49:46,055 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d92091158/f2e15b2710834ffc92d191ea785c09f0 [2023-12-15 20:49:46,056 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-15 20:49:46,057 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-12-15 20:49:46,058 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-15 20:49:46,058 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-15 20:49:46,061 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-15 20:49:46,061 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.12 08:49:46" (1/1) ... [2023-12-15 20:49:46,062 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5482caaa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 08:49:46, skipping insertion in model container [2023-12-15 20:49:46,062 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.12 08:49:46" (1/1) ... [2023-12-15 20:49:46,093 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-15 20:49:46,225 WARN L239 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/hardness-nfm22/hardness_loopvsstraightlinecode_100-while_file-22.i[916,929] [2023-12-15 20:49:46,303 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-15 20:49:46,312 INFO L202 MainTranslator]: Completed pre-run [2023-12-15 20:49:46,319 WARN L239 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/hardness-nfm22/hardness_loopvsstraightlinecode_100-while_file-22.i[916,929] [2023-12-15 20:49:46,345 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-15 20:49:46,358 INFO L206 MainTranslator]: Completed translation [2023-12-15 20:49:46,358 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 08:49:46 WrapperNode [2023-12-15 20:49:46,358 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-15 20:49:46,359 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-15 20:49:46,359 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-15 20:49:46,359 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-15 20:49:46,363 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 08:49:46" (1/1) ... [2023-12-15 20:49:46,372 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 08:49:46" (1/1) ... [2023-12-15 20:49:46,403 INFO L138 Inliner]: procedures = 26, calls = 44, calls flagged for inlining = 8, calls inlined = 8, statements flattened = 257 [2023-12-15 20:49:46,404 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-15 20:49:46,404 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-15 20:49:46,404 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-15 20:49:46,404 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-15 20:49:46,411 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 08:49:46" (1/1) ... [2023-12-15 20:49:46,411 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 08:49:46" (1/1) ... [2023-12-15 20:49:46,415 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 08:49:46" (1/1) ... [2023-12-15 20:49:46,430 INFO L175 MemorySlicer]: Split 2 memory accesses to 1 slices as follows [2]. 100 percent of accesses are in the largest equivalence class. The 2 initializations are split as follows [2]. The 0 writes are split as follows [0]. [2023-12-15 20:49:46,430 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 08:49:46" (1/1) ... [2023-12-15 20:49:46,430 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 08:49:46" (1/1) ... [2023-12-15 20:49:46,451 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 08:49:46" (1/1) ... [2023-12-15 20:49:46,454 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 08:49:46" (1/1) ... [2023-12-15 20:49:46,458 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 08:49:46" (1/1) ... [2023-12-15 20:49:46,459 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 08:49:46" (1/1) ... [2023-12-15 20:49:46,465 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-15 20:49:46,486 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-15 20:49:46,486 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-15 20:49:46,487 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-15 20:49:46,487 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 08:49:46" (1/1) ... [2023-12-15 20:49:46,510 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2023-12-15 20:49:46,537 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-12-15 20:49:46,572 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2023-12-15 20:49:46,609 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-15 20:49:46,609 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-12-15 20:49:46,609 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-12-15 20:49:46,609 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2023-12-15 20:49:46,609 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-15 20:49:46,609 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-15 20:49:46,598 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2023-12-15 20:49:46,685 INFO L241 CfgBuilder]: Building ICFG [2023-12-15 20:49:46,686 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-15 20:49:47,058 INFO L282 CfgBuilder]: Performing block encoding [2023-12-15 20:49:47,098 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-15 20:49:47,098 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-12-15 20:49:47,098 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.12 08:49:47 BoogieIcfgContainer [2023-12-15 20:49:47,098 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-15 20:49:47,100 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-15 20:49:47,100 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-15 20:49:47,102 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-15 20:49:47,102 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.12 08:49:46" (1/3) ... [2023-12-15 20:49:47,103 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c4582a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.12 08:49:47, skipping insertion in model container [2023-12-15 20:49:47,103 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 08:49:46" (2/3) ... [2023-12-15 20:49:47,103 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c4582a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.12 08:49:47, skipping insertion in model container [2023-12-15 20:49:47,103 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.12 08:49:47" (3/3) ... [2023-12-15 20:49:47,105 INFO L112 eAbstractionObserver]: Analyzing ICFG hardness_loopvsstraightlinecode_100-while_file-22.i [2023-12-15 20:49:47,117 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-15 20:49:47,118 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-15 20:49:47,161 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-15 20:49:47,167 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=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@6cabb200, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-15 20:49:47,167 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-15 20:49:47,170 INFO L276 IsEmpty]: Start isEmpty. Operand has 91 states, 57 states have (on average 1.5087719298245614) internal successors, (86), 58 states have internal predecessors, (86), 31 states have call successors, (31), 1 states have call predecessors, (31), 1 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2023-12-15 20:49:47,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2023-12-15 20:49:47,181 INFO L187 NwaCegarLoop]: Found error trace [2023-12-15 20:49:47,181 INFO L195 NwaCegarLoop]: trace histogram [31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-15 20:49:47,182 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-15 20:49:47,186 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-15 20:49:47,186 INFO L85 PathProgramCache]: Analyzing trace with hash 1709648446, now seen corresponding path program 1 times [2023-12-15 20:49:47,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-12-15 20:49:47,192 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1484322074] [2023-12-15 20:49:47,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-15 20:49:47,193 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-15 20:49:47,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-15 20:49:47,387 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-12-15 20:49:47,387 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1484322074] [2023-12-15 20:49:47,387 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-12-15 20:49:47,387 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [831825347] [2023-12-15 20:49:47,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-15 20:49:47,388 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-15 20:49:47,388 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-12-15 20:49:47,390 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-15 20:49:47,437 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-15 20:49:47,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-15 20:49:47,559 INFO L262 TraceCheckSpWp]: Trace formula consists of 497 conjuncts, 1 conjunts are in the unsatisfiable core [2023-12-15 20:49:47,573 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-15 20:49:47,620 INFO L134 CoverageAnalysis]: Checked inductivity of 1860 backedges. 60 proven. 0 refuted. 0 times theorem prover too weak. 1800 trivial. 0 not checked. [2023-12-15 20:49:47,620 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-15 20:49:47,620 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [831825347] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-15 20:49:47,621 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-15 20:49:47,621 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-15 20:49:47,622 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1541780461] [2023-12-15 20:49:47,622 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-15 20:49:47,625 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-12-15 20:49:47,625 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-12-15 20:49:47,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-12-15 20:49:47,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-12-15 20:49:47,643 INFO L87 Difference]: Start difference. First operand has 91 states, 57 states have (on average 1.5087719298245614) internal successors, (86), 58 states have internal predecessors, (86), 31 states have call successors, (31), 1 states have call predecessors, (31), 1 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) Second operand has 2 states, 2 states have (on average 22.5) internal successors, (45), 2 states have internal predecessors, (45), 2 states have call successors, (31), 2 states have call predecessors, (31), 1 states have return successors, (31), 1 states have call predecessors, (31), 2 states have call successors, (31) [2023-12-15 20:49:47,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-15 20:49:47,673 INFO L93 Difference]: Finished difference Result 179 states and 325 transitions. [2023-12-15 20:49:47,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-12-15 20:49:47,675 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 22.5) internal successors, (45), 2 states have internal predecessors, (45), 2 states have call successors, (31), 2 states have call predecessors, (31), 1 states have return successors, (31), 1 states have call predecessors, (31), 2 states have call successors, (31) Word has length 195 [2023-12-15 20:49:47,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-15 20:49:47,681 INFO L225 Difference]: With dead ends: 179 [2023-12-15 20:49:47,682 INFO L226 Difference]: Without dead ends: 89 [2023-12-15 20:49:47,687 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 194 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-12-15 20:49:47,689 INFO L413 NwaCegarLoop]: 140 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-15 20:49:47,690 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 140 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-15 20:49:47,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2023-12-15 20:49:47,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2023-12-15 20:49:47,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 56 states have (on average 1.4464285714285714) internal successors, (81), 56 states have internal predecessors, (81), 31 states have call successors, (31), 1 states have call predecessors, (31), 1 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2023-12-15 20:49:47,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 143 transitions. [2023-12-15 20:49:47,723 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 143 transitions. Word has length 195 [2023-12-15 20:49:47,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-15 20:49:47,723 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 143 transitions. [2023-12-15 20:49:47,723 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 22.5) internal successors, (45), 2 states have internal predecessors, (45), 2 states have call successors, (31), 2 states have call predecessors, (31), 1 states have return successors, (31), 1 states have call predecessors, (31), 2 states have call successors, (31) [2023-12-15 20:49:47,723 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 143 transitions. [2023-12-15 20:49:47,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2023-12-15 20:49:47,725 INFO L187 NwaCegarLoop]: Found error trace [2023-12-15 20:49:47,726 INFO L195 NwaCegarLoop]: trace histogram [31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-15 20:49:47,735 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-12-15 20:49:47,930 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-12-15 20:49:47,931 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-15 20:49:47,931 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-15 20:49:47,931 INFO L85 PathProgramCache]: Analyzing trace with hash -1037133312, now seen corresponding path program 1 times [2023-12-15 20:49:47,932 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-12-15 20:49:47,932 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1819187023] [2023-12-15 20:49:47,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-15 20:49:47,932 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-15 20:49:47,983 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-15 20:49:47,983 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [586333555] [2023-12-15 20:49:47,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-15 20:49:47,983 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-15 20:49:47,983 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-12-15 20:49:47,987 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-15 20:49:48,016 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-15 20:49:48,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-15 20:49:48,100 INFO L262 TraceCheckSpWp]: Trace formula consists of 497 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-15 20:49:48,104 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-15 20:49:48,635 INFO L134 CoverageAnalysis]: Checked inductivity of 1860 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2023-12-15 20:49:48,636 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-15 20:49:48,636 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-12-15 20:49:48,636 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1819187023] [2023-12-15 20:49:48,636 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-15 20:49:48,636 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [586333555] [2023-12-15 20:49:48,636 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [586333555] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-15 20:49:48,636 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-15 20:49:48,637 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-15 20:49:48,637 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794677908] [2023-12-15 20:49:48,637 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-15 20:49:48,639 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-15 20:49:48,640 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-12-15 20:49:48,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-15 20:49:48,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-15 20:49:48,641 INFO L87 Difference]: Start difference. First operand 89 states and 143 transitions. Second operand has 6 states, 6 states have (on average 7.166666666666667) internal successors, (43), 5 states have internal predecessors, (43), 1 states have call successors, (31), 1 states have call predecessors, (31), 1 states have return successors, (31), 1 states have call predecessors, (31), 1 states have call successors, (31) [2023-12-15 20:49:48,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-15 20:49:48,891 INFO L93 Difference]: Finished difference Result 298 states and 480 transitions. [2023-12-15 20:49:48,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-15 20:49:48,892 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 7.166666666666667) internal successors, (43), 5 states have internal predecessors, (43), 1 states have call successors, (31), 1 states have call predecessors, (31), 1 states have return successors, (31), 1 states have call predecessors, (31), 1 states have call successors, (31) Word has length 195 [2023-12-15 20:49:48,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-15 20:49:48,894 INFO L225 Difference]: With dead ends: 298 [2023-12-15 20:49:48,894 INFO L226 Difference]: Without dead ends: 210 [2023-12-15 20:49:48,895 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2023-12-15 20:49:48,896 INFO L413 NwaCegarLoop]: 139 mSDtfsCounter, 239 mSDsluCounter, 463 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 239 SdHoareTripleChecker+Valid, 602 SdHoareTripleChecker+Invalid, 229 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-15 20:49:48,896 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [239 Valid, 602 Invalid, 229 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 164 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-15 20:49:48,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2023-12-15 20:49:48,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 198. [2023-12-15 20:49:48,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 133 states have (on average 1.481203007518797) internal successors, (197), 133 states have internal predecessors, (197), 62 states have call successors, (62), 2 states have call predecessors, (62), 2 states have return successors, (62), 62 states have call predecessors, (62), 62 states have call successors, (62) [2023-12-15 20:49:48,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 321 transitions. [2023-12-15 20:49:48,916 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 321 transitions. Word has length 195 [2023-12-15 20:49:48,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-15 20:49:48,916 INFO L495 AbstractCegarLoop]: Abstraction has 198 states and 321 transitions. [2023-12-15 20:49:48,916 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 7.166666666666667) internal successors, (43), 5 states have internal predecessors, (43), 1 states have call successors, (31), 1 states have call predecessors, (31), 1 states have return successors, (31), 1 states have call predecessors, (31), 1 states have call successors, (31) [2023-12-15 20:49:48,916 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 321 transitions. [2023-12-15 20:49:48,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2023-12-15 20:49:48,918 INFO L187 NwaCegarLoop]: Found error trace [2023-12-15 20:49:48,918 INFO L195 NwaCegarLoop]: trace histogram [31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-15 20:49:48,926 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-12-15 20:49:49,122 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-12-15 20:49:49,123 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-15 20:49:49,123 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-15 20:49:49,123 INFO L85 PathProgramCache]: Analyzing trace with hash -614431486, now seen corresponding path program 1 times [2023-12-15 20:49:49,123 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-12-15 20:49:49,124 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233952011] [2023-12-15 20:49:49,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-15 20:49:49,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-15 20:49:49,165 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-15 20:49:49,165 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [813692083] [2023-12-15 20:49:49,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-15 20:49:49,165 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-15 20:49:49,165 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-12-15 20:49:49,166 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-15 20:49:49,192 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-15 20:49:49,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-15 20:49:49,273 INFO L262 TraceCheckSpWp]: Trace formula consists of 495 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-15 20:49:49,277 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-15 20:49:49,434 INFO L134 CoverageAnalysis]: Checked inductivity of 1860 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2023-12-15 20:49:49,434 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-15 20:49:49,434 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-12-15 20:49:49,434 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233952011] [2023-12-15 20:49:49,434 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-15 20:49:49,434 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [813692083] [2023-12-15 20:49:49,434 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [813692083] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-15 20:49:49,434 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-15 20:49:49,435 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-15 20:49:49,435 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421117182] [2023-12-15 20:49:49,435 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-15 20:49:49,435 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-15 20:49:49,435 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-12-15 20:49:49,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-15 20:49:49,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-15 20:49:49,436 INFO L87 Difference]: Start difference. First operand 198 states and 321 transitions. Second operand has 5 states, 5 states have (on average 8.6) internal successors, (43), 4 states have internal predecessors, (43), 1 states have call successors, (31), 1 states have call predecessors, (31), 1 states have return successors, (31), 1 states have call predecessors, (31), 1 states have call successors, (31) [2023-12-15 20:49:49,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-15 20:49:49,600 INFO L93 Difference]: Finished difference Result 520 states and 842 transitions. [2023-12-15 20:49:49,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-15 20:49:49,601 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.6) internal successors, (43), 4 states have internal predecessors, (43), 1 states have call successors, (31), 1 states have call predecessors, (31), 1 states have return successors, (31), 1 states have call predecessors, (31), 1 states have call successors, (31) Word has length 195 [2023-12-15 20:49:49,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-15 20:49:49,603 INFO L225 Difference]: With dead ends: 520 [2023-12-15 20:49:49,603 INFO L226 Difference]: Without dead ends: 323 [2023-12-15 20:49:49,603 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 191 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2023-12-15 20:49:49,604 INFO L413 NwaCegarLoop]: 129 mSDtfsCounter, 241 mSDsluCounter, 387 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 516 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-15 20:49:49,604 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [241 Valid, 516 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-15 20:49:49,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2023-12-15 20:49:49,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 283. [2023-12-15 20:49:49,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 283 states, 186 states have (on average 1.446236559139785) internal successors, (269), 186 states have internal predecessors, (269), 93 states have call successors, (93), 3 states have call predecessors, (93), 3 states have return successors, (93), 93 states have call predecessors, (93), 93 states have call successors, (93) [2023-12-15 20:49:49,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 455 transitions. [2023-12-15 20:49:49,625 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 455 transitions. Word has length 195 [2023-12-15 20:49:49,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-15 20:49:49,625 INFO L495 AbstractCegarLoop]: Abstraction has 283 states and 455 transitions. [2023-12-15 20:49:49,626 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.6) internal successors, (43), 4 states have internal predecessors, (43), 1 states have call successors, (31), 1 states have call predecessors, (31), 1 states have return successors, (31), 1 states have call predecessors, (31), 1 states have call successors, (31) [2023-12-15 20:49:49,626 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 455 transitions. [2023-12-15 20:49:49,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2023-12-15 20:49:49,627 INFO L187 NwaCegarLoop]: Found error trace [2023-12-15 20:49:49,627 INFO L195 NwaCegarLoop]: trace histogram [31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-15 20:49:49,640 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-12-15 20:49:49,833 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-15 20:49:49,833 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-15 20:49:49,833 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-15 20:49:49,834 INFO L85 PathProgramCache]: Analyzing trace with hash 2062618303, now seen corresponding path program 1 times [2023-12-15 20:49:49,834 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-12-15 20:49:49,834 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1167189094] [2023-12-15 20:49:49,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-15 20:49:49,834 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-15 20:49:49,855 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-15 20:49:49,855 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1565271648] [2023-12-15 20:49:49,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-15 20:49:49,855 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-15 20:49:49,855 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-12-15 20:49:49,857 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-15 20:49:49,860 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-15 20:49:49,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-15 20:49:49,979 INFO L262 TraceCheckSpWp]: Trace formula consists of 494 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-15 20:49:49,982 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-15 20:49:50,346 INFO L134 CoverageAnalysis]: Checked inductivity of 1860 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2023-12-15 20:49:50,346 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-15 20:49:50,346 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-12-15 20:49:50,346 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1167189094] [2023-12-15 20:49:50,346 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-15 20:49:50,346 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1565271648] [2023-12-15 20:49:50,346 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1565271648] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-15 20:49:50,347 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-15 20:49:50,347 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-15 20:49:50,347 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1881981084] [2023-12-15 20:49:50,347 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-15 20:49:50,347 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-15 20:49:50,347 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-12-15 20:49:50,348 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-15 20:49:50,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-15 20:49:50,348 INFO L87 Difference]: Start difference. First operand 283 states and 455 transitions. Second operand has 4 states, 4 states have (on average 11.0) internal successors, (44), 3 states have internal predecessors, (44), 1 states have call successors, (31), 1 states have call predecessors, (31), 1 states have return successors, (31), 1 states have call predecessors, (31), 1 states have call successors, (31) [2023-12-15 20:49:50,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-15 20:49:50,489 INFO L93 Difference]: Finished difference Result 697 states and 1116 transitions. [2023-12-15 20:49:50,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-15 20:49:50,490 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.0) internal successors, (44), 3 states have internal predecessors, (44), 1 states have call successors, (31), 1 states have call predecessors, (31), 1 states have return successors, (31), 1 states have call predecessors, (31), 1 states have call successors, (31) Word has length 196 [2023-12-15 20:49:50,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-15 20:49:50,492 INFO L225 Difference]: With dead ends: 697 [2023-12-15 20:49:50,492 INFO L226 Difference]: Without dead ends: 415 [2023-12-15 20:49:50,493 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 193 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-12-15 20:49:50,493 INFO L413 NwaCegarLoop]: 131 mSDtfsCounter, 108 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 388 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-15 20:49:50,494 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [108 Valid, 388 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-15 20:49:50,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 415 states. [2023-12-15 20:49:50,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 415 to 386. [2023-12-15 20:49:50,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 386 states, 257 states have (on average 1.45136186770428) internal successors, (373), 257 states have internal predecessors, (373), 124 states have call successors, (124), 4 states have call predecessors, (124), 4 states have return successors, (124), 124 states have call predecessors, (124), 124 states have call successors, (124) [2023-12-15 20:49:50,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 386 states to 386 states and 621 transitions. [2023-12-15 20:49:50,522 INFO L78 Accepts]: Start accepts. Automaton has 386 states and 621 transitions. Word has length 196 [2023-12-15 20:49:50,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-15 20:49:50,523 INFO L495 AbstractCegarLoop]: Abstraction has 386 states and 621 transitions. [2023-12-15 20:49:50,523 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.0) internal successors, (44), 3 states have internal predecessors, (44), 1 states have call successors, (31), 1 states have call predecessors, (31), 1 states have return successors, (31), 1 states have call predecessors, (31), 1 states have call successors, (31) [2023-12-15 20:49:50,523 INFO L276 IsEmpty]: Start isEmpty. Operand 386 states and 621 transitions. [2023-12-15 20:49:50,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2023-12-15 20:49:50,525 INFO L187 NwaCegarLoop]: Found error trace [2023-12-15 20:49:50,525 INFO L195 NwaCegarLoop]: trace histogram [31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-15 20:49:50,534 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-12-15 20:49:50,736 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-15 20:49:50,737 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-15 20:49:50,737 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-15 20:49:50,737 INFO L85 PathProgramCache]: Analyzing trace with hash 1219967849, now seen corresponding path program 1 times [2023-12-15 20:49:50,737 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-12-15 20:49:50,738 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1961085313] [2023-12-15 20:49:50,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-15 20:49:50,738 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-15 20:49:50,779 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-15 20:49:50,780 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2137194474] [2023-12-15 20:49:50,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-15 20:49:50,780 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-15 20:49:50,780 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-12-15 20:49:50,781 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-15 20:49:50,808 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-15 20:49:50,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-15 20:49:50,896 INFO L262 TraceCheckSpWp]: Trace formula consists of 506 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-15 20:49:50,900 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-15 20:49:51,249 INFO L134 CoverageAnalysis]: Checked inductivity of 1860 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2023-12-15 20:49:51,249 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-15 20:49:51,249 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-12-15 20:49:51,249 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1961085313] [2023-12-15 20:49:51,249 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-15 20:49:51,250 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2137194474] [2023-12-15 20:49:51,250 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2137194474] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-15 20:49:51,251 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-15 20:49:51,251 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-15 20:49:51,251 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014406829] [2023-12-15 20:49:51,251 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-15 20:49:51,252 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-15 20:49:51,252 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-12-15 20:49:51,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-15 20:49:51,252 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-15 20:49:51,252 INFO L87 Difference]: Start difference. First operand 386 states and 621 transitions. Second operand has 6 states, 6 states have (on average 7.666666666666667) internal successors, (46), 5 states have internal predecessors, (46), 1 states have call successors, (31), 1 states have call predecessors, (31), 1 states have return successors, (31), 1 states have call predecessors, (31), 1 states have call successors, (31) [2023-12-15 20:49:51,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-15 20:49:51,446 INFO L93 Difference]: Finished difference Result 764 states and 1226 transitions. [2023-12-15 20:49:51,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-15 20:49:51,446 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 7.666666666666667) internal successors, (46), 5 states have internal predecessors, (46), 1 states have call successors, (31), 1 states have call predecessors, (31), 1 states have return successors, (31), 1 states have call predecessors, (31), 1 states have call successors, (31) Word has length 198 [2023-12-15 20:49:51,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-15 20:49:51,448 INFO L225 Difference]: With dead ends: 764 [2023-12-15 20:49:51,448 INFO L226 Difference]: Without dead ends: 434 [2023-12-15 20:49:51,449 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 193 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2023-12-15 20:49:51,450 INFO L413 NwaCegarLoop]: 142 mSDtfsCounter, 227 mSDsluCounter, 465 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 607 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-15 20:49:51,451 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [227 Valid, 607 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 164 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-15 20:49:51,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2023-12-15 20:49:51,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 385. [2023-12-15 20:49:51,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 385 states, 256 states have (on average 1.4453125) internal successors, (370), 256 states have internal predecessors, (370), 124 states have call successors, (124), 4 states have call predecessors, (124), 4 states have return successors, (124), 124 states have call predecessors, (124), 124 states have call successors, (124) [2023-12-15 20:49:51,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 385 states to 385 states and 618 transitions. [2023-12-15 20:49:51,500 INFO L78 Accepts]: Start accepts. Automaton has 385 states and 618 transitions. Word has length 198 [2023-12-15 20:49:51,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-15 20:49:51,500 INFO L495 AbstractCegarLoop]: Abstraction has 385 states and 618 transitions. [2023-12-15 20:49:51,500 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 7.666666666666667) internal successors, (46), 5 states have internal predecessors, (46), 1 states have call successors, (31), 1 states have call predecessors, (31), 1 states have return successors, (31), 1 states have call predecessors, (31), 1 states have call successors, (31) [2023-12-15 20:49:51,500 INFO L276 IsEmpty]: Start isEmpty. Operand 385 states and 618 transitions. [2023-12-15 20:49:51,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2023-12-15 20:49:51,502 INFO L187 NwaCegarLoop]: Found error trace [2023-12-15 20:49:51,502 INFO L195 NwaCegarLoop]: trace histogram [31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-15 20:49:51,508 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-12-15 20:49:51,707 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-15 20:49:51,708 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-15 20:49:51,708 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-15 20:49:51,708 INFO L85 PathProgramCache]: Analyzing trace with hash -585470485, now seen corresponding path program 1 times [2023-12-15 20:49:51,708 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-12-15 20:49:51,708 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [270774081] [2023-12-15 20:49:51,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-15 20:49:51,708 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-15 20:49:51,723 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-15 20:49:51,724 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1392503346] [2023-12-15 20:49:51,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-15 20:49:51,724 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-15 20:49:51,724 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-12-15 20:49:51,725 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-15 20:49:51,736 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-15 20:49:51,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-15 20:49:51,832 INFO L262 TraceCheckSpWp]: Trace formula consists of 504 conjuncts, 11 conjunts are in the unsatisfiable core [2023-12-15 20:49:51,835 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-15 20:49:52,180 INFO L134 CoverageAnalysis]: Checked inductivity of 1860 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2023-12-15 20:49:52,180 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-15 20:49:52,180 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-12-15 20:49:52,180 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [270774081] [2023-12-15 20:49:52,181 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-15 20:49:52,181 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1392503346] [2023-12-15 20:49:52,181 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1392503346] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-15 20:49:52,181 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-15 20:49:52,181 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-15 20:49:52,181 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593081373] [2023-12-15 20:49:52,181 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-15 20:49:52,181 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-15 20:49:52,181 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-12-15 20:49:52,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-15 20:49:52,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-15 20:49:52,182 INFO L87 Difference]: Start difference. First operand 385 states and 618 transitions. Second operand has 4 states, 4 states have (on average 11.5) internal successors, (46), 3 states have internal predecessors, (46), 1 states have call successors, (31), 1 states have call predecessors, (31), 1 states have return successors, (31), 1 states have call predecessors, (31), 1 states have call successors, (31) [2023-12-15 20:49:52,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-15 20:49:52,325 INFO L93 Difference]: Finished difference Result 987 states and 1588 transitions. [2023-12-15 20:49:52,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-15 20:49:52,325 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 3 states have internal predecessors, (46), 1 states have call successors, (31), 1 states have call predecessors, (31), 1 states have return successors, (31), 1 states have call predecessors, (31), 1 states have call successors, (31) Word has length 198 [2023-12-15 20:49:52,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-15 20:49:52,328 INFO L225 Difference]: With dead ends: 987 [2023-12-15 20:49:52,328 INFO L226 Difference]: Without dead ends: 688 [2023-12-15 20:49:52,329 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 195 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-12-15 20:49:52,329 INFO L413 NwaCegarLoop]: 132 mSDtfsCounter, 55 mSDsluCounter, 190 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 322 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-15 20:49:52,330 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 322 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-15 20:49:52,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 688 states. [2023-12-15 20:49:52,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 688 to 682. [2023-12-15 20:49:52,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 682 states, 457 states have (on average 1.437636761487965) internal successors, (657), 457 states have internal predecessors, (657), 217 states have call successors, (217), 7 states have call predecessors, (217), 7 states have return successors, (217), 217 states have call predecessors, (217), 217 states have call successors, (217) [2023-12-15 20:49:52,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 682 states to 682 states and 1091 transitions. [2023-12-15 20:49:52,371 INFO L78 Accepts]: Start accepts. Automaton has 682 states and 1091 transitions. Word has length 198 [2023-12-15 20:49:52,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-15 20:49:52,371 INFO L495 AbstractCegarLoop]: Abstraction has 682 states and 1091 transitions. [2023-12-15 20:49:52,371 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 3 states have internal predecessors, (46), 1 states have call successors, (31), 1 states have call predecessors, (31), 1 states have return successors, (31), 1 states have call predecessors, (31), 1 states have call successors, (31) [2023-12-15 20:49:52,372 INFO L276 IsEmpty]: Start isEmpty. Operand 682 states and 1091 transitions. [2023-12-15 20:49:52,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2023-12-15 20:49:52,373 INFO L187 NwaCegarLoop]: Found error trace [2023-12-15 20:49:52,373 INFO L195 NwaCegarLoop]: trace histogram [31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-15 20:49:52,381 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-12-15 20:49:52,578 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-15 20:49:52,579 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-15 20:49:52,579 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-15 20:49:52,579 INFO L85 PathProgramCache]: Analyzing trace with hash -327305047, now seen corresponding path program 1 times [2023-12-15 20:49:52,579 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-12-15 20:49:52,579 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1153918516] [2023-12-15 20:49:52,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-15 20:49:52,580 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-15 20:49:52,594 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-15 20:49:52,594 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2667386] [2023-12-15 20:49:52,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-15 20:49:52,594 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-15 20:49:52,594 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-12-15 20:49:52,595 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-15 20:49:52,600 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-15 20:49:52,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-15 20:49:52,725 INFO L262 TraceCheckSpWp]: Trace formula consists of 504 conjuncts, 32 conjunts are in the unsatisfiable core [2023-12-15 20:49:52,728 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-15 20:49:53,570 INFO L134 CoverageAnalysis]: Checked inductivity of 1860 backedges. 1221 proven. 111 refuted. 0 times theorem prover too weak. 528 trivial. 0 not checked. [2023-12-15 20:49:53,570 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-15 20:49:54,656 INFO L134 CoverageAnalysis]: Checked inductivity of 1860 backedges. 141 proven. 120 refuted. 0 times theorem prover too weak. 1599 trivial. 0 not checked. [2023-12-15 20:49:54,656 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-12-15 20:49:54,656 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1153918516] [2023-12-15 20:49:54,657 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-15 20:49:54,657 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2667386] [2023-12-15 20:49:54,657 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2667386] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-15 20:49:54,657 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-15 20:49:54,657 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 33 [2023-12-15 20:49:54,657 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830848108] [2023-12-15 20:49:54,657 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-15 20:49:54,657 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2023-12-15 20:49:54,657 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-12-15 20:49:54,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2023-12-15 20:49:54,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=758, Unknown=0, NotChecked=0, Total=1056 [2023-12-15 20:49:54,659 INFO L87 Difference]: Start difference. First operand 682 states and 1091 transitions. Second operand has 33 states, 32 states have (on average 3.34375) internal successors, (107), 31 states have internal predecessors, (107), 8 states have call successors, (62), 5 states have call predecessors, (62), 10 states have return successors, (62), 8 states have call predecessors, (62), 8 states have call successors, (62) [2023-12-15 20:49:56,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-15 20:49:56,837 INFO L93 Difference]: Finished difference Result 1911 states and 2952 transitions. [2023-12-15 20:49:56,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2023-12-15 20:49:56,838 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 3.34375) internal successors, (107), 31 states have internal predecessors, (107), 8 states have call successors, (62), 5 states have call predecessors, (62), 10 states have return successors, (62), 8 states have call predecessors, (62), 8 states have call successors, (62) Word has length 198 [2023-12-15 20:49:56,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-15 20:49:56,842 INFO L225 Difference]: With dead ends: 1911 [2023-12-15 20:49:56,842 INFO L226 Difference]: Without dead ends: 1333 [2023-12-15 20:49:56,844 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 365 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 987 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=955, Invalid=2125, Unknown=0, NotChecked=0, Total=3080 [2023-12-15 20:49:56,845 INFO L413 NwaCegarLoop]: 116 mSDtfsCounter, 859 mSDsluCounter, 1349 mSDsCounter, 0 mSdLazyCounter, 1891 mSolverCounterSat, 161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 879 SdHoareTripleChecker+Valid, 1465 SdHoareTripleChecker+Invalid, 2052 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 1891 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2023-12-15 20:49:56,845 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [879 Valid, 1465 Invalid, 2052 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 1891 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2023-12-15 20:49:56,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1333 states. [2023-12-15 20:49:56,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1333 to 993. [2023-12-15 20:49:56,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 993 states, 680 states have (on average 1.3985294117647058) internal successors, (951), 680 states have internal predecessors, (951), 279 states have call successors, (279), 33 states have call predecessors, (279), 33 states have return successors, (279), 279 states have call predecessors, (279), 279 states have call successors, (279) [2023-12-15 20:49:56,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 993 states to 993 states and 1509 transitions. [2023-12-15 20:49:56,910 INFO L78 Accepts]: Start accepts. Automaton has 993 states and 1509 transitions. Word has length 198 [2023-12-15 20:49:56,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-15 20:49:56,911 INFO L495 AbstractCegarLoop]: Abstraction has 993 states and 1509 transitions. [2023-12-15 20:49:56,911 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 3.34375) internal successors, (107), 31 states have internal predecessors, (107), 8 states have call successors, (62), 5 states have call predecessors, (62), 10 states have return successors, (62), 8 states have call predecessors, (62), 8 states have call successors, (62) [2023-12-15 20:49:56,911 INFO L276 IsEmpty]: Start isEmpty. Operand 993 states and 1509 transitions. [2023-12-15 20:49:56,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2023-12-15 20:49:56,913 INFO L187 NwaCegarLoop]: Found error trace [2023-12-15 20:49:56,913 INFO L195 NwaCegarLoop]: trace histogram [31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-15 20:49:56,921 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-12-15 20:49:57,121 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-15 20:49:57,124 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-15 20:49:57,124 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-15 20:49:57,124 INFO L85 PathProgramCache]: Analyzing trace with hash -755644068, now seen corresponding path program 1 times [2023-12-15 20:49:57,125 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-12-15 20:49:57,125 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [50378518] [2023-12-15 20:49:57,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-15 20:49:57,125 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-15 20:49:57,143 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-15 20:49:57,144 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [358973433] [2023-12-15 20:49:57,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-15 20:49:57,144 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-15 20:49:57,144 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-12-15 20:49:57,145 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-15 20:49:57,148 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-15 20:49:57,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-15 20:49:57,229 INFO L262 TraceCheckSpWp]: Trace formula consists of 505 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-15 20:49:57,232 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-15 20:49:57,247 INFO L134 CoverageAnalysis]: Checked inductivity of 1860 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2023-12-15 20:49:57,247 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-15 20:49:57,248 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-12-15 20:49:57,248 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [50378518] [2023-12-15 20:49:57,248 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-15 20:49:57,248 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [358973433] [2023-12-15 20:49:57,248 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [358973433] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-15 20:49:57,248 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-15 20:49:57,248 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-15 20:49:57,248 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1416276369] [2023-12-15 20:49:57,248 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-15 20:49:57,248 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-15 20:49:57,248 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-12-15 20:49:57,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-15 20:49:57,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-15 20:49:57,250 INFO L87 Difference]: Start difference. First operand 993 states and 1509 transitions. Second operand has 4 states, 4 states have (on average 11.75) internal successors, (47), 4 states have internal predecessors, (47), 1 states have call successors, (31), 1 states have call predecessors, (31), 1 states have return successors, (31), 1 states have call predecessors, (31), 1 states have call successors, (31) [2023-12-15 20:49:57,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-15 20:49:57,357 INFO L93 Difference]: Finished difference Result 2216 states and 3397 transitions. [2023-12-15 20:49:57,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-15 20:49:57,358 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 4 states have internal predecessors, (47), 1 states have call successors, (31), 1 states have call predecessors, (31), 1 states have return successors, (31), 1 states have call predecessors, (31), 1 states have call successors, (31) Word has length 199 [2023-12-15 20:49:57,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-15 20:49:57,363 INFO L225 Difference]: With dead ends: 2216 [2023-12-15 20:49:57,363 INFO L226 Difference]: Without dead ends: 1315 [2023-12-15 20:49:57,365 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 196 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-12-15 20:49:57,365 INFO L413 NwaCegarLoop]: 162 mSDtfsCounter, 61 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 407 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-15 20:49:57,365 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 407 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-15 20:49:57,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1315 states. [2023-12-15 20:49:57,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1315 to 1095. [2023-12-15 20:49:57,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1095 states, 782 states have (on average 1.3797953964194374) internal successors, (1079), 782 states have internal predecessors, (1079), 279 states have call successors, (279), 33 states have call predecessors, (279), 33 states have return successors, (279), 279 states have call predecessors, (279), 279 states have call successors, (279) [2023-12-15 20:49:57,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1095 states to 1095 states and 1637 transitions. [2023-12-15 20:49:57,433 INFO L78 Accepts]: Start accepts. Automaton has 1095 states and 1637 transitions. Word has length 199 [2023-12-15 20:49:57,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-15 20:49:57,433 INFO L495 AbstractCegarLoop]: Abstraction has 1095 states and 1637 transitions. [2023-12-15 20:49:57,433 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 4 states have internal predecessors, (47), 1 states have call successors, (31), 1 states have call predecessors, (31), 1 states have return successors, (31), 1 states have call predecessors, (31), 1 states have call successors, (31) [2023-12-15 20:49:57,433 INFO L276 IsEmpty]: Start isEmpty. Operand 1095 states and 1637 transitions. [2023-12-15 20:49:57,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2023-12-15 20:49:57,435 INFO L187 NwaCegarLoop]: Found error trace [2023-12-15 20:49:57,436 INFO L195 NwaCegarLoop]: trace histogram [31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-15 20:49:57,441 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-12-15 20:49:57,640 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-12-15 20:49:57,641 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-15 20:49:57,641 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-15 20:49:57,641 INFO L85 PathProgramCache]: Analyzing trace with hash 1950975326, now seen corresponding path program 1 times [2023-12-15 20:49:57,641 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-12-15 20:49:57,641 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [304552760] [2023-12-15 20:49:57,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-15 20:49:57,642 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-15 20:49:57,659 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-15 20:49:57,659 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1550300788] [2023-12-15 20:49:57,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-15 20:49:57,659 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-15 20:49:57,659 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-12-15 20:49:57,660 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-15 20:49:57,683 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-15 20:49:57,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-15 20:49:57,786 INFO L262 TraceCheckSpWp]: Trace formula consists of 504 conjuncts, 29 conjunts are in the unsatisfiable core [2023-12-15 20:49:57,790 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-15 20:49:59,034 INFO L134 CoverageAnalysis]: Checked inductivity of 1860 backedges. 839 proven. 48 refuted. 0 times theorem prover too weak. 973 trivial. 0 not checked. [2023-12-15 20:49:59,034 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-15 20:49:59,895 INFO L134 CoverageAnalysis]: Checked inductivity of 1860 backedges. 126 proven. 51 refuted. 0 times theorem prover too weak. 1683 trivial. 0 not checked. [2023-12-15 20:49:59,895 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-12-15 20:49:59,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [304552760] [2023-12-15 20:49:59,895 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-15 20:49:59,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1550300788] [2023-12-15 20:49:59,895 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1550300788] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-15 20:49:59,896 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-15 20:49:59,896 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 25 [2023-12-15 20:49:59,896 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475088410] [2023-12-15 20:49:59,896 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-15 20:49:59,896 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-12-15 20:49:59,896 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-12-15 20:49:59,897 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-12-15 20:49:59,897 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=447, Unknown=0, NotChecked=0, Total=600 [2023-12-15 20:49:59,897 INFO L87 Difference]: Start difference. First operand 1095 states and 1637 transitions. Second operand has 25 states, 24 states have (on average 4.125) internal successors, (99), 23 states have internal predecessors, (99), 6 states have call successors, (62), 4 states have call predecessors, (62), 7 states have return successors, (62), 6 states have call predecessors, (62), 6 states have call successors, (62) [2023-12-15 20:50:02,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-15 20:50:02,155 INFO L93 Difference]: Finished difference Result 2452 states and 3706 transitions. [2023-12-15 20:50:02,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2023-12-15 20:50:02,156 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 4.125) internal successors, (99), 23 states have internal predecessors, (99), 6 states have call successors, (62), 4 states have call predecessors, (62), 7 states have return successors, (62), 6 states have call predecessors, (62), 6 states have call successors, (62) Word has length 199 [2023-12-15 20:50:02,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-15 20:50:02,161 INFO L225 Difference]: With dead ends: 2452 [2023-12-15 20:50:02,161 INFO L226 Difference]: Without dead ends: 1505 [2023-12-15 20:50:02,164 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 424 GetRequests, 376 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 681 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=648, Invalid=1802, Unknown=0, NotChecked=0, Total=2450 [2023-12-15 20:50:02,165 INFO L413 NwaCegarLoop]: 239 mSDtfsCounter, 630 mSDsluCounter, 1375 mSDsCounter, 0 mSdLazyCounter, 1718 mSolverCounterSat, 279 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 631 SdHoareTripleChecker+Valid, 1614 SdHoareTripleChecker+Invalid, 1997 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 279 IncrementalHoareTripleChecker+Valid, 1718 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2023-12-15 20:50:02,165 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [631 Valid, 1614 Invalid, 1997 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [279 Valid, 1718 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2023-12-15 20:50:02,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1505 states. [2023-12-15 20:50:02,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1505 to 1093. [2023-12-15 20:50:02,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1093 states, 779 states have (on average 1.3581514762516047) internal successors, (1058), 779 states have internal predecessors, (1058), 279 states have call successors, (279), 34 states have call predecessors, (279), 34 states have return successors, (279), 279 states have call predecessors, (279), 279 states have call successors, (279) [2023-12-15 20:50:02,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1093 states to 1093 states and 1616 transitions. [2023-12-15 20:50:02,282 INFO L78 Accepts]: Start accepts. Automaton has 1093 states and 1616 transitions. Word has length 199 [2023-12-15 20:50:02,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-15 20:50:02,283 INFO L495 AbstractCegarLoop]: Abstraction has 1093 states and 1616 transitions. [2023-12-15 20:50:02,283 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 4.125) internal successors, (99), 23 states have internal predecessors, (99), 6 states have call successors, (62), 4 states have call predecessors, (62), 7 states have return successors, (62), 6 states have call predecessors, (62), 6 states have call successors, (62) [2023-12-15 20:50:02,283 INFO L276 IsEmpty]: Start isEmpty. Operand 1093 states and 1616 transitions. [2023-12-15 20:50:02,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2023-12-15 20:50:02,285 INFO L187 NwaCegarLoop]: Found error trace [2023-12-15 20:50:02,285 INFO L195 NwaCegarLoop]: trace histogram [31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-15 20:50:02,291 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-12-15 20:50:02,491 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-15 20:50:02,491 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-15 20:50:02,492 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-15 20:50:02,492 INFO L85 PathProgramCache]: Analyzing trace with hash 1854270283, now seen corresponding path program 1 times [2023-12-15 20:50:02,492 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-12-15 20:50:02,492 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [712738753] [2023-12-15 20:50:02,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-15 20:50:02,492 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-15 20:50:02,517 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-15 20:50:02,517 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1188236837] [2023-12-15 20:50:02,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-15 20:50:02,518 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-15 20:50:02,518 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-12-15 20:50:02,520 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-15 20:50:02,544 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-15 20:50:02,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-15 20:50:02,881 INFO L262 TraceCheckSpWp]: Trace formula consists of 508 conjuncts, 86 conjunts are in the unsatisfiable core [2023-12-15 20:50:02,885 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-15 20:50:06,886 INFO L134 CoverageAnalysis]: Checked inductivity of 1860 backedges. 1536 proven. 126 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2023-12-15 20:50:06,886 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-15 20:50:26,005 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-12-15 20:50:26,005 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [712738753] [2023-12-15 20:50:26,005 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-15 20:50:26,006 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1188236837] [2023-12-15 20:50:26,006 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1188236837] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-15 20:50:26,006 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-12-15 20:50:26,006 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2023-12-15 20:50:26,006 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887823704] [2023-12-15 20:50:26,006 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-12-15 20:50:26,007 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-12-15 20:50:26,007 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-12-15 20:50:26,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-12-15 20:50:26,008 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=641, Invalid=2899, Unknown=0, NotChecked=0, Total=3540 [2023-12-15 20:50:26,008 INFO L87 Difference]: Start difference. First operand 1093 states and 1616 transitions. Second operand has 49 states, 49 states have (on average 1.9387755102040816) internal successors, (95), 42 states have internal predecessors, (95), 13 states have call successors, (31), 13 states have call predecessors, (31), 17 states have return successors, (31), 14 states have call predecessors, (31), 13 states have call successors, (31) Received shutdown request... [2023-12-15 20:50:54,144 WARN L340 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Timeout while monitored process is still running, waiting 1000 ms for graceful end [2023-12-15 20:50:54,148 WARN L340 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Timeout while monitored process is still running, waiting 1000 ms for graceful end [2023-12-15 20:50:54,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2023-12-15 20:50:54,628 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 173 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3439 ImplicationChecksByTransitivity, 31.1s TimeCoverageRelationStatistics Valid=2539, Invalid=10801, Unknown=0, NotChecked=0, Total=13340 [2023-12-15 20:50:54,628 INFO L413 NwaCegarLoop]: 90 mSDtfsCounter, 673 mSDsluCounter, 900 mSDsCounter, 0 mSdLazyCounter, 1589 mSolverCounterSat, 161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 673 SdHoareTripleChecker+Valid, 990 SdHoareTripleChecker+Invalid, 1750 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 1589 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.9s IncrementalHoareTripleChecker+Time [2023-12-15 20:50:54,628 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [673 Valid, 990 Invalid, 1750 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 1589 Invalid, 0 Unknown, 0 Unchecked, 10.9s Time] [2023-12-15 20:50:54,629 INFO L805 garLoopResultBuilder]: Registering result TIMEOUT for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-12-15 20:50:54,636 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-12-15 20:50:54,835 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-15 20:50:54,836 WARN L619 AbstractCegarLoop]: Verification canceled: while NwaCegarLoop was constructing difference of abstraction (1093states) and FLOYD_HOARE automaton (currently 60 states, 49 states before enhancement),while ReachableStatesComputation was computing reachable states (643 states constructed, input type IntersectNwa). [2023-12-15 20:50:54,839 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-15 20:50:54,841 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2023-12-15 20:50:54,842 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 15.12 08:50:54 BoogieIcfgContainer [2023-12-15 20:50:54,842 INFO L131 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2023-12-15 20:50:54,842 INFO L158 Benchmark]: Toolchain (without parser) took 68785.10ms. Allocated memory was 187.7MB in the beginning and 534.8MB in the end (delta: 347.1MB). Free memory was 144.4MB in the beginning and 492.3MB in the end (delta: -347.9MB). Peak memory consumption was 308.5MB. Max. memory is 8.0GB. [2023-12-15 20:50:54,842 INFO L158 Benchmark]: CDTParser took 0.11ms. Allocated memory is still 187.7MB. Free memory is still 145.6MB. There was no memory consumed. Max. memory is 8.0GB. [2023-12-15 20:50:54,843 INFO L158 Benchmark]: CACSL2BoogieTranslator took 300.29ms. Allocated memory is still 187.7MB. Free memory was 144.2MB in the beginning and 126.3MB in the end (delta: 17.8MB). Peak memory consumption was 17.8MB. Max. memory is 8.0GB. [2023-12-15 20:50:54,843 INFO L158 Benchmark]: Boogie Procedure Inliner took 44.84ms. Allocated memory is still 187.7MB. Free memory was 126.3MB in the beginning and 120.0MB in the end (delta: 6.3MB). Peak memory consumption was 6.3MB. Max. memory is 8.0GB. [2023-12-15 20:50:54,843 INFO L158 Benchmark]: Boogie Preprocessor took 81.72ms. Allocated memory was 187.7MB in the beginning and 256.9MB in the end (delta: 69.2MB). Free memory was 120.0MB in the beginning and 231.2MB in the end (delta: -111.1MB). Peak memory consumption was 15.5MB. Max. memory is 8.0GB. [2023-12-15 20:50:54,843 INFO L158 Benchmark]: RCFGBuilder took 611.96ms. Allocated memory is still 256.9MB. Free memory was 231.2MB in the beginning and 196.0MB in the end (delta: 35.2MB). Peak memory consumption was 35.7MB. Max. memory is 8.0GB. [2023-12-15 20:50:54,843 INFO L158 Benchmark]: TraceAbstraction took 67742.10ms. Allocated memory was 256.9MB in the beginning and 534.8MB in the end (delta: 277.9MB). Free memory was 195.5MB in the beginning and 492.3MB in the end (delta: -296.9MB). Peak memory consumption was 290.8MB. Max. memory is 8.0GB. [2023-12-15 20:50:54,844 INFO L338 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11ms. Allocated memory is still 187.7MB. Free memory is still 145.6MB. There was no memory consumed. Max. memory is 8.0GB. * CACSL2BoogieTranslator took 300.29ms. Allocated memory is still 187.7MB. Free memory was 144.2MB in the beginning and 126.3MB in the end (delta: 17.8MB). Peak memory consumption was 17.8MB. Max. memory is 8.0GB. * Boogie Procedure Inliner took 44.84ms. Allocated memory is still 187.7MB. Free memory was 126.3MB in the beginning and 120.0MB in the end (delta: 6.3MB). Peak memory consumption was 6.3MB. Max. memory is 8.0GB. * Boogie Preprocessor took 81.72ms. Allocated memory was 187.7MB in the beginning and 256.9MB in the end (delta: 69.2MB). Free memory was 120.0MB in the beginning and 231.2MB in the end (delta: -111.1MB). Peak memory consumption was 15.5MB. Max. memory is 8.0GB. * RCFGBuilder took 611.96ms. Allocated memory is still 256.9MB. Free memory was 231.2MB in the beginning and 196.0MB in the end (delta: 35.2MB). Peak memory consumption was 35.7MB. Max. memory is 8.0GB. * TraceAbstraction took 67742.10ms. Allocated memory was 256.9MB in the beginning and 534.8MB in the end (delta: 277.9MB). Free memory was 195.5MB in the beginning and 492.3MB in the end (delta: -296.9MB). Peak memory consumption was 290.8MB. Max. memory is 8.0GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - TimeoutResultAtElement [Line: 19]: Timeout (TraceAbstraction) Unable to prove that a call to reach_error is unreachable (line 19). Cancelled while NwaCegarLoop was constructing difference of abstraction (1093states) and FLOYD_HOARE automaton (currently 60 states, 49 states before enhancement),while ReachableStatesComputation was computing reachable states (643 states constructed, input type IntersectNwa). - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 91 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 67.7s, OverallIterations: 10, TraceHistogramMax: 31, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 34.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 3114 SdHoareTripleChecker+Valid, 14.5s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 3093 mSDsluCounter, 7051 SdHoareTripleChecker+Invalid, 13.8s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 5631 mSDsCounter, 867 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 5775 IncrementalHoareTripleChecker+Invalid, 6642 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 867 mSolverCounterUnsat, 1420 mSDtfsCounter, 5775 mSolverCounterSat, 0.1s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 2513 GetRequests, 2266 SyntacticMatches, 0 SemanticMatches, 247 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5117 ImplicationChecksByTransitivity, 33.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=1095occurred in iteration=8, InterpolantAutomatonStates: 110, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.4s AutomataMinimizationTime, 9 MinimizatonAttempts, 1108 StatesRemovedByMinimization, 8 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 1.0s SatisfiabilityAnalysisTime, 29.1s InterpolantComputationTime, 2167 NumberOfCodeBlocks, 2167 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 2357 ConstructedInterpolants, 12 QuantifiedInterpolants, 21695 SizeOfPredicates, 67 NumberOfNonLiveVariables, 5014 ConjunctsInSsa, 188 ConjunctsInUnsatCore, 12 InterpolantComputations, 7 PerfectInterpolantSequences, 21864/22320 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown