/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --cacsl2boogietranslator.allow.undefined.functions true --traceabstraction.smt.solver External_ModelsAndUnsatCoreMode --traceabstraction.command.for.external.solver 'mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3' -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-64bit-Automizer_Bitvector.epf -i ../../../trunk/examples/svcomp/hardware-verification-bv/btor2c-lazyMod.vis_QF_BV_vlunc.c -------------------------------------------------------------------------------- This is Ultimate 0.2.5-dev-356b6ba-m [2024-11-01 18:20:00,822 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-01 18:20:00,904 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-64bit-Automizer_Bitvector.epf [2024-11-01 18:20:00,910 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-01 18:20:00,911 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-01 18:20:00,939 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-01 18:20:00,939 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-01 18:20:00,940 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-01 18:20:00,940 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2024-11-01 18:20:00,941 INFO L153 SettingsManager]: * Use memory slicer=true [2024-11-01 18:20:00,941 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-01 18:20:00,942 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-01 18:20:00,942 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-11-01 18:20:00,944 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-11-01 18:20:00,944 INFO L153 SettingsManager]: * Use SBE=true [2024-11-01 18:20:00,944 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-01 18:20:00,945 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-01 18:20:00,945 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-01 18:20:00,945 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-01 18:20:00,946 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-01 18:20:00,946 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-01 18:20:00,949 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2024-11-01 18:20:00,950 INFO L153 SettingsManager]: * Use bitvectors instead of ints=true [2024-11-01 18:20:00,950 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-01 18:20:00,950 INFO L153 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2024-11-01 18:20:00,951 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-01 18:20:00,951 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-01 18:20:00,951 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-01 18:20:00,952 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2024-11-01 18:20:00,952 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-01 18:20:00,954 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-01 18:20:00,955 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-11-01 18:20:00,955 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-01 18:20:00,955 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-01 18:20:00,955 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-01 18:20:00,956 INFO L153 SettingsManager]: * Trace refinement strategy=WOLF [2024-11-01 18:20:00,956 INFO L153 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2024-11-01 18:20:00,956 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-01 18:20:00,956 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2024-11-01 18:20:00,957 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2024-11-01 18:20:00,957 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-01 18:20:00,958 INFO L153 SettingsManager]: * Logic for external solver=AUFBV [2024-11-01 18:20:00,958 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Allow undefined functions -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Command for external solver -> mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2024-11-01 18:20:01,274 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-01 18:20:01,298 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-01 18:20:01,302 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-01 18:20:01,303 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-01 18:20:01,304 INFO L274 PluginConnector]: CDTParser initialized [2024-11-01 18:20:01,305 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/hardware-verification-bv/btor2c-lazyMod.vis_QF_BV_vlunc.c [2024-11-01 18:20:02,749 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-01 18:20:03,013 INFO L384 CDTParser]: Found 1 translation units. [2024-11-01 18:20:03,013 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/hardware-verification-bv/btor2c-lazyMod.vis_QF_BV_vlunc.c [2024-11-01 18:20:03,037 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5b7400955/1ce1a7ebbe3746f1b29034c8cff84c00/FLAG0864401af [2024-11-01 18:20:03,053 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5b7400955/1ce1a7ebbe3746f1b29034c8cff84c00 [2024-11-01 18:20:03,056 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-01 18:20:03,057 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2024-11-01 18:20:03,059 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-01 18:20:03,059 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-01 18:20:03,064 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-01 18:20:03,065 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.11 06:20:03" (1/1) ... [2024-11-01 18:20:03,066 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@537a0b8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.11 06:20:03, skipping insertion in model container [2024-11-01 18:20:03,067 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.11 06:20:03" (1/1) ... [2024-11-01 18:20:03,099 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-01 18:20:03,298 WARN L251 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/hardware-verification-bv/btor2c-lazyMod.vis_QF_BV_vlunc.c[1255,1268] [2024-11-01 18:20:03,406 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-01 18:20:03,424 INFO L200 MainTranslator]: Completed pre-run [2024-11-01 18:20:03,435 WARN L251 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/hardware-verification-bv/btor2c-lazyMod.vis_QF_BV_vlunc.c[1255,1268] [2024-11-01 18:20:03,506 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-01 18:20:03,531 INFO L204 MainTranslator]: Completed translation [2024-11-01 18:20:03,533 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.11 06:20:03 WrapperNode [2024-11-01 18:20:03,534 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-01 18:20:03,535 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-01 18:20:03,535 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-01 18:20:03,535 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-01 18:20:03,542 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.11 06:20:03" (1/1) ... [2024-11-01 18:20:03,557 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.11 06:20:03" (1/1) ... [2024-11-01 18:20:03,611 INFO L138 Inliner]: procedures = 17, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 277 [2024-11-01 18:20:03,611 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-01 18:20:03,612 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-01 18:20:03,612 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-01 18:20:03,612 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-01 18:20:03,632 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.11 06:20:03" (1/1) ... [2024-11-01 18:20:03,632 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.11 06:20:03" (1/1) ... [2024-11-01 18:20:03,639 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.11 06:20:03" (1/1) ... [2024-11-01 18:20:03,666 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]. [2024-11-01 18:20:03,666 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.11 06:20:03" (1/1) ... [2024-11-01 18:20:03,666 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.11 06:20:03" (1/1) ... [2024-11-01 18:20:03,684 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.11 06:20:03" (1/1) ... [2024-11-01 18:20:03,688 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.11 06:20:03" (1/1) ... [2024-11-01 18:20:03,696 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.11 06:20:03" (1/1) ... [2024-11-01 18:20:03,698 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.11 06:20:03" (1/1) ... [2024-11-01 18:20:03,708 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-01 18:20:03,709 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-01 18:20:03,709 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-01 18:20:03,709 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-01 18:20:03,710 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.11 06:20:03" (1/1) ... [2024-11-01 18:20:03,724 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-11-01 18:20:03,740 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-11-01 18:20:03,757 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) [2024-11-01 18:20:03,760 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 [2024-11-01 18:20:03,791 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-01 18:20:03,791 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1#0 [2024-11-01 18:20:03,791 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-01 18:20:03,792 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-01 18:20:03,917 INFO L238 CfgBuilder]: Building ICFG [2024-11-01 18:20:03,919 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-01 18:20:04,309 INFO L? ?]: Removed 56 outVars from TransFormulas that were not future-live. [2024-11-01 18:20:04,309 INFO L287 CfgBuilder]: Performing block encoding [2024-11-01 18:20:04,322 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-01 18:20:04,322 INFO L316 CfgBuilder]: Removed 1 assume(true) statements. [2024-11-01 18:20:04,323 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.11 06:20:04 BoogieIcfgContainer [2024-11-01 18:20:04,323 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-01 18:20:04,327 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-01 18:20:04,327 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-01 18:20:04,331 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-01 18:20:04,331 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.11 06:20:03" (1/3) ... [2024-11-01 18:20:04,332 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74edab7a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.11 06:20:04, skipping insertion in model container [2024-11-01 18:20:04,333 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.11 06:20:03" (2/3) ... [2024-11-01 18:20:04,333 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74edab7a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.11 06:20:04, skipping insertion in model container [2024-11-01 18:20:04,334 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.11 06:20:04" (3/3) ... [2024-11-01 18:20:04,335 INFO L112 eAbstractionObserver]: Analyzing ICFG btor2c-lazyMod.vis_QF_BV_vlunc.c [2024-11-01 18:20:04,352 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-01 18:20:04,353 INFO L154 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-11-01 18:20:04,404 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-01 18:20:04,413 INFO L333 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mAutomataTypeConcurrency=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;@540fd4af, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-01 18:20:04,413 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-11-01 18:20:04,418 INFO L276 IsEmpty]: Start isEmpty. Operand has 10 states, 8 states have (on average 1.375) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-01 18:20:04,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2024-11-01 18:20:04,424 INFO L207 NwaCegarLoop]: Found error trace [2024-11-01 18:20:04,425 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2024-11-01 18:20:04,427 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-01 18:20:04,434 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-01 18:20:04,435 INFO L85 PathProgramCache]: Analyzing trace with hash 28694789, now seen corresponding path program 1 times [2024-11-01 18:20:04,444 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2024-11-01 18:20:04,445 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1247089647] [2024-11-01 18:20:04,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-01 18:20:04,448 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2024-11-01 18:20:04,448 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2024-11-01 18:20:04,452 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2024-11-01 18:20:04,456 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2024-11-01 18:20:04,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-01 18:20:04,624 WARN L253 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 45 conjuncts are in the unsatisfiable core [2024-11-01 18:20:04,640 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-01 18:20:05,289 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-01 18:20:05,289 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-01 18:20:05,466 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-01 18:20:05,467 INFO L136 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2024-11-01 18:20:05,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1247089647] [2024-11-01 18:20:05,468 INFO L158 FreeRefinementEngine]: IpTcStrategyModulePreferences [1247089647] provided 2 perfect and 0 imperfect interpolant sequences [2024-11-01 18:20:05,468 INFO L185 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2024-11-01 18:20:05,468 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2024-11-01 18:20:05,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542812273] [2024-11-01 18:20:05,472 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2024-11-01 18:20:05,475 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2024-11-01 18:20:05,476 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2024-11-01 18:20:05,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2024-11-01 18:20:05,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-11-01 18:20:05,501 INFO L87 Difference]: Start difference. First operand has 10 states, 8 states have (on average 1.375) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-01 18:20:05,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-01 18:20:05,574 INFO L93 Difference]: Finished difference Result 18 states and 23 transitions. [2024-11-01 18:20:05,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-11-01 18:20:05,577 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2024-11-01 18:20:05,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-01 18:20:05,584 INFO L225 Difference]: With dead ends: 18 [2024-11-01 18:20:05,584 INFO L226 Difference]: Without dead ends: 10 [2024-11-01 18:20:05,588 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2024-11-01 18:20:05,593 INFO L432 NwaCegarLoop]: 4 mSDtfsCounter, 4 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-01 18:20:05,594 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 14 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-01 18:20:05,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2024-11-01 18:20:05,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 9. [2024-11-01 18:20:05,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-01 18:20:05,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2024-11-01 18:20:05,624 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 5 [2024-11-01 18:20:05,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-01 18:20:05,624 INFO L471 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2024-11-01 18:20:05,625 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-01 18:20:05,625 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2024-11-01 18:20:05,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2024-11-01 18:20:05,625 INFO L207 NwaCegarLoop]: Found error trace [2024-11-01 18:20:05,625 INFO L215 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2024-11-01 18:20:05,633 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2024-11-01 18:20:05,831 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2024-11-01 18:20:05,832 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-01 18:20:05,832 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-01 18:20:05,833 INFO L85 PathProgramCache]: Analyzing trace with hash 152739811, now seen corresponding path program 1 times [2024-11-01 18:20:05,833 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2024-11-01 18:20:05,833 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1661883624] [2024-11-01 18:20:05,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-01 18:20:05,833 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2024-11-01 18:20:05,834 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2024-11-01 18:20:05,835 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2024-11-01 18:20:05,852 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2024-11-01 18:20:06,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-01 18:20:06,024 INFO L255 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 52 conjuncts are in the unsatisfiable core [2024-11-01 18:20:06,035 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-01 18:20:07,799 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-01 18:20:07,799 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-01 18:20:20,369 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-01 18:20:20,370 INFO L136 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2024-11-01 18:20:20,370 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1661883624] [2024-11-01 18:20:20,370 INFO L158 FreeRefinementEngine]: IpTcStrategyModulePreferences [1661883624] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-01 18:20:20,371 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-01 18:20:20,371 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2024-11-01 18:20:20,371 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514132209] [2024-11-01 18:20:20,372 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-01 18:20:20,373 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2024-11-01 18:20:20,373 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2024-11-01 18:20:20,374 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2024-11-01 18:20:20,374 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=37, Unknown=1, NotChecked=0, Total=56 [2024-11-01 18:20:20,374 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand has 8 states, 8 states have (on average 1.75) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-01 18:20:20,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-01 18:20:20,479 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2024-11-01 18:20:20,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2024-11-01 18:20:20,480 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2024-11-01 18:20:20,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-01 18:20:20,480 INFO L225 Difference]: With dead ends: 15 [2024-11-01 18:20:20,481 INFO L226 Difference]: Without dead ends: 13 [2024-11-01 18:20:20,481 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=33, Invalid=56, Unknown=1, NotChecked=0, Total=90 [2024-11-01 18:20:20,482 INFO L432 NwaCegarLoop]: 4 mSDtfsCounter, 4 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-01 18:20:20,482 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 14 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-01 18:20:20,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2024-11-01 18:20:20,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 12. [2024-11-01 18:20:20,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 11 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-01 18:20:20,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2024-11-01 18:20:20,486 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 8 [2024-11-01 18:20:20,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-01 18:20:20,486 INFO L471 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2024-11-01 18:20:20,486 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-01 18:20:20,486 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2024-11-01 18:20:20,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2024-11-01 18:20:20,487 INFO L207 NwaCegarLoop]: Found error trace [2024-11-01 18:20:20,487 INFO L215 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2024-11-01 18:20:20,491 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2024-11-01 18:20:20,687 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2024-11-01 18:20:20,688 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-01 18:20:20,689 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-01 18:20:20,689 INFO L85 PathProgramCache]: Analyzing trace with hash 1906115653, now seen corresponding path program 2 times [2024-11-01 18:20:20,689 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2024-11-01 18:20:20,689 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1745506061] [2024-11-01 18:20:20,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-01 18:20:20,690 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2024-11-01 18:20:20,690 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2024-11-01 18:20:20,691 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2024-11-01 18:20:20,693 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2024-11-01 18:20:20,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-01 18:20:20,855 INFO L255 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 58 conjuncts are in the unsatisfiable core [2024-11-01 18:20:20,861 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-01 18:20:22,477 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-01 18:20:22,478 INFO L311 TraceCheckSpWp]: Computing backward predicates...