/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/automizer/BvToInt/svcomp-Reach-64bit-Automizer_Bitvector.epf -i ../../../trunk/examples/svcomp/recursive-simple/sum_20x0-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-a10ec3b [2022-01-10 06:39:52,921 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-01-10 06:39:52,923 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-01-10 06:39:52,974 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-01-10 06:39:53,004 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-01-10 06:39:53,004 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-01-10 06:39:53,005 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-01-10 06:39:53,010 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/BvToInt/svcomp-Reach-64bit-Automizer_Bitvector.epf [2022-01-10 06:39:53,025 INFO L113 SettingsManager]: Loading preferences was successful [2022-01-10 06:39:53,025 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-01-10 06:39:53,025 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-01-10 06:39:53,025 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-01-10 06:39:53,026 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-01-10 06:39:53,026 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-01-10 06:39:53,026 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-01-10 06:39:53,026 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-01-10 06:39:53,026 INFO L138 SettingsManager]: * Use SBE=true [2022-01-10 06:39:53,026 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-01-10 06:39:53,026 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-01-10 06:39:53,026 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-01-10 06:39:53,026 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-01-10 06:39:53,027 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-01-10 06:39:53,027 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-01-10 06:39:53,027 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-01-10 06:39:53,027 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2022-01-10 06:39:53,027 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2022-01-10 06:39:53,027 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-01-10 06:39:53,027 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-01-10 06:39:53,027 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-01-10 06:39:53,027 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-01-10 06:39:53,027 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-01-10 06:39:53,027 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-10 06:39:53,028 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-01-10 06:39:53,028 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-01-10 06:39:53,028 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-01-10 06:39:53,028 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2022-01-10 06:39:53,028 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2022-01-10 06:39:53,028 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2022-01-10 06:39:53,028 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-01-10 06:39:53,028 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-01-10 06:39:53,028 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-01-10 06:39:53,028 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-01-10 06:39:53,217 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-01-10 06:39:53,233 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-01-10 06:39:53,237 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-01-10 06:39:53,238 INFO L271 PluginConnector]: Initializing CDTParser... [2022-01-10 06:39:53,238 INFO L275 PluginConnector]: CDTParser initialized [2022-01-10 06:39:53,239 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_20x0-2.c [2022-01-10 06:39:53,283 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1ec337b4c/b0d1282f766845ff8169985edf816bff/FLAGf272615d1 [2022-01-10 06:39:53,609 INFO L306 CDTParser]: Found 1 translation units. [2022-01-10 06:39:53,610 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/sum_20x0-2.c [2022-01-10 06:39:53,614 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1ec337b4c/b0d1282f766845ff8169985edf816bff/FLAGf272615d1 [2022-01-10 06:39:54,055 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1ec337b4c/b0d1282f766845ff8169985edf816bff [2022-01-10 06:39:54,057 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-01-10 06:39:54,058 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2022-01-10 06:39:54,063 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-01-10 06:39:54,063 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-01-10 06:39:54,065 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-01-10 06:39:54,066 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.01 06:39:54" (1/1) ... [2022-01-10 06:39:54,067 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@47663cf3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 06:39:54, skipping insertion in model container [2022-01-10 06:39:54,067 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.01 06:39:54" (1/1) ... [2022-01-10 06:39:54,071 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-01-10 06:39:54,079 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-01-10 06:39:54,176 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/sum_20x0-2.c[481,494] [2022-01-10 06:39:54,177 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-10 06:39:54,184 INFO L203 MainTranslator]: Completed pre-run [2022-01-10 06:39:54,194 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/sum_20x0-2.c[481,494] [2022-01-10 06:39:54,195 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-10 06:39:54,203 INFO L208 MainTranslator]: Completed translation [2022-01-10 06:39:54,203 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 06:39:54 WrapperNode [2022-01-10 06:39:54,203 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-01-10 06:39:54,204 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-01-10 06:39:54,204 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-01-10 06:39:54,204 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-01-10 06:39:54,219 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 06:39:54" (1/1) ... [2022-01-10 06:39:54,224 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 06:39:54" (1/1) ... [2022-01-10 06:39:54,237 INFO L137 Inliner]: procedures = 12, calls = 9, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 19 [2022-01-10 06:39:54,237 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-01-10 06:39:54,238 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-01-10 06:39:54,238 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-01-10 06:39:54,238 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-01-10 06:39:54,243 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 06:39:54" (1/1) ... [2022-01-10 06:39:54,243 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 06:39:54" (1/1) ... [2022-01-10 06:39:54,244 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 06:39:54" (1/1) ... [2022-01-10 06:39:54,244 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 06:39:54" (1/1) ... [2022-01-10 06:39:54,247 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 06:39:54" (1/1) ... [2022-01-10 06:39:54,248 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 06:39:54" (1/1) ... [2022-01-10 06:39:54,248 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 06:39:54" (1/1) ... [2022-01-10 06:39:54,255 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-01-10 06:39:54,256 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-01-10 06:39:54,256 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-01-10 06:39:54,256 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-01-10 06:39:54,258 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 06:39:54" (1/1) ... [2022-01-10 06:39:54,262 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-10 06:39:54,271 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-10 06:39:54,283 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-01-10 06:39:54,311 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-01-10 06:39:54,313 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-01-10 06:39:54,313 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-01-10 06:39:54,313 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-01-10 06:39:54,314 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2022-01-10 06:39:54,314 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2022-01-10 06:39:54,314 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2022-01-10 06:39:54,359 INFO L234 CfgBuilder]: Building ICFG [2022-01-10 06:39:54,361 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-01-10 06:39:54,434 INFO L275 CfgBuilder]: Performing block encoding [2022-01-10 06:39:54,438 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-01-10 06:39:54,438 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2022-01-10 06:39:54,439 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.01 06:39:54 BoogieIcfgContainer [2022-01-10 06:39:54,440 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-01-10 06:39:54,441 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-01-10 06:39:54,441 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-01-10 06:39:54,443 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-01-10 06:39:54,443 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 10.01 06:39:54" (1/3) ... [2022-01-10 06:39:54,444 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6b78bff7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.01 06:39:54, skipping insertion in model container [2022-01-10 06:39:54,444 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 06:39:54" (2/3) ... [2022-01-10 06:39:54,444 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6b78bff7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.01 06:39:54, skipping insertion in model container [2022-01-10 06:39:54,444 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.01 06:39:54" (3/3) ... [2022-01-10 06:39:54,445 INFO L111 eAbstractionObserver]: Analyzing ICFG sum_20x0-2.c [2022-01-10 06:39:54,448 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-01-10 06:39:54,449 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-01-10 06:39:54,498 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-01-10 06:39:54,503 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2022-01-10 06:39:54,503 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-01-10 06:39:54,512 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-10 06:39:54,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-01-10 06:39:54,516 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 06:39:54,516 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 06:39:54,516 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 06:39:54,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 06:39:54,520 INFO L85 PathProgramCache]: Analyzing trace with hash -358017204, now seen corresponding path program 1 times [2022-01-10 06:39:54,527 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 06:39:54,527 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [885820259] [2022-01-10 06:39:54,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-10 06:39:54,528 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 06:39:54,528 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 06:39:54,530 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 06:39:54,566 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2022-01-10 06:39:54,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-10 06:39:54,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2022-01-10 06:39:54,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 06:39:54,690 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-10 06:39:54,690 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-01-10 06:39:54,691 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 06:39:54,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [885820259] [2022-01-10 06:39:54,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [885820259] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-10 06:39:54,691 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-10 06:39:54,692 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-01-10 06:39:54,693 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458773079] [2022-01-10 06:39:54,693 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-10 06:39:54,696 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-01-10 06:39:54,696 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 06:39:54,715 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-01-10 06:39:54,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-01-10 06:39:54,717 INFO L87 Difference]: Start difference. First operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-10 06:39:54,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 06:39:54,782 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2022-01-10 06:39:54,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-01-10 06:39:54,786 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2022-01-10 06:39:54,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 06:39:54,792 INFO L225 Difference]: With dead ends: 25 [2022-01-10 06:39:54,792 INFO L226 Difference]: Without dead ends: 15 [2022-01-10 06:39:54,794 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-01-10 06:39:54,799 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 11 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-10 06:39:54,801 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 30 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-10 06:39:54,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-01-10 06:39:54,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-01-10 06:39:54,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.1) internal successors, (11), 11 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-01-10 06:39:54,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2022-01-10 06:39:54,839 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2022-01-10 06:39:54,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 06:39:54,839 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2022-01-10 06:39:54,839 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-10 06:39:54,840 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2022-01-10 06:39:54,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-01-10 06:39:54,841 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 06:39:54,842 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 06:39:54,850 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Ended with exit code 0 [2022-01-10 06:39:55,047 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 06:39:55,048 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 06:39:55,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 06:39:55,049 INFO L85 PathProgramCache]: Analyzing trace with hash 679465686, now seen corresponding path program 1 times [2022-01-10 06:39:55,049 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 06:39:55,049 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [243073565] [2022-01-10 06:39:55,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-10 06:39:55,049 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 06:39:55,050 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 06:39:55,052 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 06:39:55,053 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2022-01-10 06:39:55,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-10 06:39:55,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 6 conjunts are in the unsatisfiable core [2022-01-10 06:39:55,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 06:39:55,175 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-01-10 06:39:55,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-10 06:39:55,398 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-01-10 06:39:55,399 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 06:39:55,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [243073565] [2022-01-10 06:39:55,399 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [243073565] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-10 06:39:55,399 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-01-10 06:39:55,399 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2022-01-10 06:39:55,399 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564263215] [2022-01-10 06:39:55,399 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-01-10 06:39:55,400 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-01-10 06:39:55,400 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 06:39:55,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-01-10 06:39:55,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2022-01-10 06:39:55,401 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 9 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 9 states have internal predecessors, (16), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 4 states have call successors, (4) [2022-01-10 06:39:55,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 06:39:55,453 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2022-01-10 06:39:55,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-01-10 06:39:55,453 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 9 states have internal predecessors, (16), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 4 states have call successors, (4) Word has length 16 [2022-01-10 06:39:55,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 06:39:55,454 INFO L225 Difference]: With dead ends: 22 [2022-01-10 06:39:55,454 INFO L226 Difference]: Without dead ends: 18 [2022-01-10 06:39:55,455 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2022-01-10 06:39:55,455 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 13 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-10 06:39:55,456 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 32 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-10 06:39:55,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-01-10 06:39:55,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-01-10 06:39:55,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 13 states have internal predecessors, (13), 2 states have call successors, (2), 1 states have call predecessors, (2), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2022-01-10 06:39:55,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2022-01-10 06:39:55,459 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 16 [2022-01-10 06:39:55,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 06:39:55,459 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2022-01-10 06:39:55,460 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 9 states have internal predecessors, (16), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 4 states have call successors, (4) [2022-01-10 06:39:55,460 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2022-01-10 06:39:55,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-01-10 06:39:55,460 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 06:39:55,460 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 06:39:55,468 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Ended with exit code 0 [2022-01-10 06:39:55,666 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 06:39:55,667 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 06:39:55,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 06:39:55,667 INFO L85 PathProgramCache]: Analyzing trace with hash -41010676, now seen corresponding path program 2 times [2022-01-10 06:39:55,668 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 06:39:55,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1031185254] [2022-01-10 06:39:55,668 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-01-10 06:39:55,668 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 06:39:55,668 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 06:39:55,669 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 06:39:55,671 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2022-01-10 06:39:55,695 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-01-10 06:39:55,696 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-10 06:39:55,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 8 conjunts are in the unsatisfiable core [2022-01-10 06:39:55,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 06:39:55,797 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-01-10 06:39:55,797 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-10 06:39:56,142 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-01-10 06:39:56,142 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 06:39:56,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1031185254] [2022-01-10 06:39:56,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1031185254] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-10 06:39:56,142 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-01-10 06:39:56,142 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2022-01-10 06:39:56,142 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239257761] [2022-01-10 06:39:56,143 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-01-10 06:39:56,143 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-01-10 06:39:56,143 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 06:39:56,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-01-10 06:39:56,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-01-10 06:39:56,144 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 11 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 11 states have internal predecessors, (20), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (6), 3 states have call predecessors, (6), 5 states have call successors, (6) [2022-01-10 06:39:56,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 06:39:56,243 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2022-01-10 06:39:56,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-01-10 06:39:56,243 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 11 states have internal predecessors, (20), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (6), 3 states have call predecessors, (6), 5 states have call successors, (6) Word has length 22 [2022-01-10 06:39:56,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 06:39:56,244 INFO L225 Difference]: With dead ends: 25 [2022-01-10 06:39:56,244 INFO L226 Difference]: Without dead ends: 21 [2022-01-10 06:39:56,244 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2022-01-10 06:39:56,245 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 31 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-10 06:39:56,245 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 50 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-10 06:39:56,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-01-10 06:39:56,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-01-10 06:39:56,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 15 states have internal predecessors, (15), 2 states have call successors, (2), 1 states have call predecessors, (2), 4 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2022-01-10 06:39:56,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2022-01-10 06:39:56,248 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 22 [2022-01-10 06:39:56,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 06:39:56,249 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2022-01-10 06:39:56,249 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 11 states have internal predecessors, (20), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (6), 3 states have call predecessors, (6), 5 states have call successors, (6) [2022-01-10 06:39:56,249 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2022-01-10 06:39:56,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-01-10 06:39:56,250 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 06:39:56,250 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 06:39:56,256 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2022-01-10 06:39:56,455 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 06:39:56,456 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 06:39:56,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 06:39:56,457 INFO L85 PathProgramCache]: Analyzing trace with hash 1769866774, now seen corresponding path program 3 times [2022-01-10 06:39:56,457 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 06:39:56,457 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2088775704] [2022-01-10 06:39:56,457 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-01-10 06:39:56,457 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 06:39:56,457 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 06:39:56,458 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 06:39:56,459 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2022-01-10 06:39:56,492 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-01-10 06:39:56,492 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-10 06:39:56,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 11 conjunts are in the unsatisfiable core [2022-01-10 06:39:56,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 06:39:56,677 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-01-10 06:39:56,677 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-10 06:39:57,413 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-01-10 06:39:57,413 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 06:39:57,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2088775704] [2022-01-10 06:39:57,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2088775704] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-10 06:39:57,413 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-01-10 06:39:57,413 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 15 [2022-01-10 06:39:57,413 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675716888] [2022-01-10 06:39:57,414 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-01-10 06:39:57,414 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-01-10 06:39:57,414 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 06:39:57,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-01-10 06:39:57,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2022-01-10 06:39:57,415 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 15 states, 11 states have (on average 2.272727272727273) internal successors, (25), 15 states have internal predecessors, (25), 7 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 4 states have call predecessors, (8), 7 states have call successors, (8) [2022-01-10 06:39:57,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 06:39:57,609 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2022-01-10 06:39:57,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-01-10 06:39:57,609 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 11 states have (on average 2.272727272727273) internal successors, (25), 15 states have internal predecessors, (25), 7 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 4 states have call predecessors, (8), 7 states have call successors, (8) Word has length 28 [2022-01-10 06:39:57,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 06:39:57,610 INFO L225 Difference]: With dead ends: 28 [2022-01-10 06:39:57,610 INFO L226 Difference]: Without dead ends: 24 [2022-01-10 06:39:57,611 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=82, Invalid=260, Unknown=0, NotChecked=0, Total=342 [2022-01-10 06:39:57,611 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 41 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-10 06:39:57,612 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 83 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-10 06:39:57,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-01-10 06:39:57,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-01-10 06:39:57,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.0625) internal successors, (17), 17 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 5 states have return successors, (6), 5 states have call predecessors, (6), 2 states have call successors, (6) [2022-01-10 06:39:57,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2022-01-10 06:39:57,615 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 28 [2022-01-10 06:39:57,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 06:39:57,615 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2022-01-10 06:39:57,615 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 11 states have (on average 2.272727272727273) internal successors, (25), 15 states have internal predecessors, (25), 7 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 4 states have call predecessors, (8), 7 states have call successors, (8) [2022-01-10 06:39:57,616 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2022-01-10 06:39:57,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-01-10 06:39:57,616 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 06:39:57,616 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 06:39:57,624 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Ended with exit code 0 [2022-01-10 06:39:57,822 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 06:39:57,822 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 06:39:57,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 06:39:57,823 INFO L85 PathProgramCache]: Analyzing trace with hash 371264716, now seen corresponding path program 4 times [2022-01-10 06:39:57,823 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 06:39:57,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2136533317] [2022-01-10 06:39:57,823 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-01-10 06:39:57,824 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 06:39:57,824 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 06:39:57,824 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 06:39:57,826 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2022-01-10 06:39:57,854 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-01-10 06:39:57,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-10 06:39:57,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 12 conjunts are in the unsatisfiable core [2022-01-10 06:39:57,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 06:39:57,978 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-01-10 06:39:57,978 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-10 06:39:58,658 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-01-10 06:39:58,659 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 06:39:58,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2136533317] [2022-01-10 06:39:58,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2136533317] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-10 06:39:58,659 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-01-10 06:39:58,659 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2022-01-10 06:39:58,659 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099550131] [2022-01-10 06:39:58,659 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-01-10 06:39:58,660 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-01-10 06:39:58,660 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 06:39:58,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-01-10 06:39:58,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2022-01-10 06:39:58,660 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 15 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 15 states have internal predecessors, (28), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (10), 5 states have call predecessors, (10), 7 states have call successors, (10) [2022-01-10 06:39:58,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 06:39:58,835 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2022-01-10 06:39:58,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-01-10 06:39:58,836 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 15 states have internal predecessors, (28), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (10), 5 states have call predecessors, (10), 7 states have call successors, (10) Word has length 34 [2022-01-10 06:39:58,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 06:39:58,836 INFO L225 Difference]: With dead ends: 31 [2022-01-10 06:39:58,837 INFO L226 Difference]: Without dead ends: 27 [2022-01-10 06:39:58,837 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=83, Invalid=297, Unknown=0, NotChecked=0, Total=380 [2022-01-10 06:39:58,837 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 43 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-10 06:39:58,838 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 100 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-10 06:39:58,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-01-10 06:39:58,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-01-10 06:39:58,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.0555555555555556) internal successors, (19), 19 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 6 states have return successors, (7), 6 states have call predecessors, (7), 2 states have call successors, (7) [2022-01-10 06:39:58,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2022-01-10 06:39:58,841 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 34 [2022-01-10 06:39:58,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 06:39:58,841 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2022-01-10 06:39:58,841 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 15 states have internal predecessors, (28), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (10), 5 states have call predecessors, (10), 7 states have call successors, (10) [2022-01-10 06:39:58,841 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2022-01-10 06:39:58,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-01-10 06:39:58,842 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 06:39:58,842 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 06:39:58,851 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2022-01-10 06:39:59,042 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 06:39:59,043 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 06:39:59,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 06:39:59,043 INFO L85 PathProgramCache]: Analyzing trace with hash -886339242, now seen corresponding path program 5 times [2022-01-10 06:39:59,044 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 06:39:59,044 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [361307453] [2022-01-10 06:39:59,044 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-01-10 06:39:59,044 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 06:39:59,044 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 06:39:59,045 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 06:39:59,045 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2022-01-10 06:39:59,076 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2022-01-10 06:39:59,076 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-10 06:39:59,078 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 15 conjunts are in the unsatisfiable core [2022-01-10 06:39:59,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 06:39:59,351 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 4 proven. 40 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-01-10 06:39:59,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-10 06:40:00,808 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-01-10 06:40:00,808 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 06:40:00,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [361307453] [2022-01-10 06:40:00,809 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [361307453] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-10 06:40:00,809 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-01-10 06:40:00,809 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16] total 19 [2022-01-10 06:40:00,809 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585149929] [2022-01-10 06:40:00,809 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-01-10 06:40:00,810 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-01-10 06:40:00,810 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 06:40:00,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-01-10 06:40:00,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2022-01-10 06:40:00,811 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 19 states, 15 states have (on average 2.2) internal successors, (33), 19 states have internal predecessors, (33), 9 states have call successors, (9), 1 states have call predecessors, (9), 6 states have return successors, (12), 6 states have call predecessors, (12), 9 states have call successors, (12) [2022-01-10 06:40:01,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 06:40:01,141 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2022-01-10 06:40:01,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-01-10 06:40:01,142 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 15 states have (on average 2.2) internal successors, (33), 19 states have internal predecessors, (33), 9 states have call successors, (9), 1 states have call predecessors, (9), 6 states have return successors, (12), 6 states have call predecessors, (12), 9 states have call successors, (12) Word has length 40 [2022-01-10 06:40:01,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 06:40:01,142 INFO L225 Difference]: With dead ends: 34 [2022-01-10 06:40:01,142 INFO L226 Difference]: Without dead ends: 30 [2022-01-10 06:40:01,143 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2022-01-10 06:40:01,143 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 46 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-10 06:40:01,144 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 140 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-10 06:40:01,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-01-10 06:40:01,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-01-10 06:40:01,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 20 states have (on average 1.05) internal successors, (21), 21 states have internal predecessors, (21), 2 states have call successors, (2), 1 states have call predecessors, (2), 7 states have return successors, (8), 7 states have call predecessors, (8), 2 states have call successors, (8) [2022-01-10 06:40:01,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2022-01-10 06:40:01,147 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 40 [2022-01-10 06:40:01,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 06:40:01,147 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2022-01-10 06:40:01,147 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 15 states have (on average 2.2) internal successors, (33), 19 states have internal predecessors, (33), 9 states have call successors, (9), 1 states have call predecessors, (9), 6 states have return successors, (12), 6 states have call predecessors, (12), 9 states have call successors, (12) [2022-01-10 06:40:01,147 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2022-01-10 06:40:01,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-01-10 06:40:01,148 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 06:40:01,148 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 06:40:01,156 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2022-01-10 06:40:01,348 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 06:40:01,349 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 06:40:01,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 06:40:01,349 INFO L85 PathProgramCache]: Analyzing trace with hash -918712436, now seen corresponding path program 6 times [2022-01-10 06:40:01,349 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 06:40:01,350 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2005022425] [2022-01-10 06:40:01,350 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-01-10 06:40:01,350 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 06:40:01,350 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 06:40:01,352 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 06:40:01,352 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2022-01-10 06:40:01,393 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-01-10 06:40:01,393 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-10 06:40:01,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 17 conjunts are in the unsatisfiable core [2022-01-10 06:40:01,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 06:40:01,718 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 5 proven. 57 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2022-01-10 06:40:01,718 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-10 06:40:03,535 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-01-10 06:40:03,535 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 06:40:03,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2005022425] [2022-01-10 06:40:03,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2005022425] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-10 06:40:03,536 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-01-10 06:40:03,536 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 18] total 21 [2022-01-10 06:40:03,536 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429678459] [2022-01-10 06:40:03,536 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-01-10 06:40:03,536 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-01-10 06:40:03,536 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 06:40:03,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-01-10 06:40:03,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=355, Unknown=0, NotChecked=0, Total=420 [2022-01-10 06:40:03,537 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 21 states, 17 states have (on average 2.176470588235294) internal successors, (37), 21 states have internal predecessors, (37), 10 states have call successors, (10), 1 states have call predecessors, (10), 7 states have return successors, (14), 7 states have call predecessors, (14), 10 states have call successors, (14) [2022-01-10 06:40:03,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 06:40:03,947 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2022-01-10 06:40:03,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-01-10 06:40:03,948 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 17 states have (on average 2.176470588235294) internal successors, (37), 21 states have internal predecessors, (37), 10 states have call successors, (10), 1 states have call predecessors, (10), 7 states have return successors, (14), 7 states have call predecessors, (14), 10 states have call successors, (14) Word has length 46 [2022-01-10 06:40:03,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 06:40:03,948 INFO L225 Difference]: With dead ends: 37 [2022-01-10 06:40:03,949 INFO L226 Difference]: Without dead ends: 33 [2022-01-10 06:40:03,949 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=154, Invalid=602, Unknown=0, NotChecked=0, Total=756 [2022-01-10 06:40:03,950 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 25 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-10 06:40:03,950 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 180 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-10 06:40:03,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-01-10 06:40:03,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-01-10 06:40:03,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 22 states have (on average 1.0454545454545454) internal successors, (23), 23 states have internal predecessors, (23), 2 states have call successors, (2), 1 states have call predecessors, (2), 8 states have return successors, (9), 8 states have call predecessors, (9), 2 states have call successors, (9) [2022-01-10 06:40:03,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2022-01-10 06:40:03,953 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 46 [2022-01-10 06:40:03,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 06:40:03,953 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2022-01-10 06:40:03,954 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 17 states have (on average 2.176470588235294) internal successors, (37), 21 states have internal predecessors, (37), 10 states have call successors, (10), 1 states have call predecessors, (10), 7 states have return successors, (14), 7 states have call predecessors, (14), 10 states have call successors, (14) [2022-01-10 06:40:03,954 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2022-01-10 06:40:03,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-01-10 06:40:03,954 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 06:40:03,954 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 06:40:03,969 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2022-01-10 06:40:04,163 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 06:40:04,163 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 06:40:04,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 06:40:04,164 INFO L85 PathProgramCache]: Analyzing trace with hash -626238314, now seen corresponding path program 7 times [2022-01-10 06:40:04,164 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 06:40:04,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2121836988] [2022-01-10 06:40:04,164 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-01-10 06:40:04,164 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 06:40:04,164 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 06:40:04,165 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 06:40:04,166 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2022-01-10 06:40:04,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-10 06:40:04,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 18 conjunts are in the unsatisfiable core [2022-01-10 06:40:04,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 06:40:04,450 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2022-01-10 06:40:04,451 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-10 06:40:06,019 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-01-10 06:40:06,019 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 06:40:06,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2121836988] [2022-01-10 06:40:06,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2121836988] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-10 06:40:06,020 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-01-10 06:40:06,020 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2022-01-10 06:40:06,020 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940987634] [2022-01-10 06:40:06,020 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-01-10 06:40:06,021 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-01-10 06:40:06,021 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 06:40:06,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-01-10 06:40:06,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2022-01-10 06:40:06,021 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand has 21 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 21 states have internal predecessors, (40), 10 states have call successors, (10), 1 states have call predecessors, (10), 8 states have return successors, (16), 8 states have call predecessors, (16), 10 states have call successors, (16) [2022-01-10 06:40:06,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 06:40:06,307 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2022-01-10 06:40:06,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-01-10 06:40:06,308 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 21 states have internal predecessors, (40), 10 states have call successors, (10), 1 states have call predecessors, (10), 8 states have return successors, (16), 8 states have call predecessors, (16), 10 states have call successors, (16) Word has length 52 [2022-01-10 06:40:06,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 06:40:06,308 INFO L225 Difference]: With dead ends: 40 [2022-01-10 06:40:06,308 INFO L226 Difference]: Without dead ends: 36 [2022-01-10 06:40:06,309 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=152, Invalid=660, Unknown=0, NotChecked=0, Total=812 [2022-01-10 06:40:06,309 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 22 mSDsluCounter, 201 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-10 06:40:06,310 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 223 Invalid, 174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-10 06:40:06,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-01-10 06:40:06,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2022-01-10 06:40:06,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 24 states have (on average 1.0416666666666667) internal successors, (25), 25 states have internal predecessors, (25), 2 states have call successors, (2), 1 states have call predecessors, (2), 9 states have return successors, (10), 9 states have call predecessors, (10), 2 states have call successors, (10) [2022-01-10 06:40:06,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2022-01-10 06:40:06,315 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 52 [2022-01-10 06:40:06,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 06:40:06,315 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2022-01-10 06:40:06,315 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 21 states have internal predecessors, (40), 10 states have call successors, (10), 1 states have call predecessors, (10), 8 states have return successors, (16), 8 states have call predecessors, (16), 10 states have call successors, (16) [2022-01-10 06:40:06,315 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2022-01-10 06:40:06,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-01-10 06:40:06,316 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 06:40:06,316 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 06:40:06,325 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (9)] Ended with exit code 0 [2022-01-10 06:40:06,522 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 06:40:06,524 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 06:40:06,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 06:40:06,525 INFO L85 PathProgramCache]: Analyzing trace with hash -960511412, now seen corresponding path program 8 times [2022-01-10 06:40:06,525 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 06:40:06,525 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [319856103] [2022-01-10 06:40:06,525 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-01-10 06:40:06,525 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 06:40:06,525 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 06:40:06,526 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 06:40:06,527 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2022-01-10 06:40:06,588 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-01-10 06:40:06,588 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-10 06:40:06,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 20 conjunts are in the unsatisfiable core [2022-01-10 06:40:06,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 06:40:06,814 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2022-01-10 06:40:06,814 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-10 06:40:08,606 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-01-10 06:40:08,606 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 06:40:08,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [319856103] [2022-01-10 06:40:08,607 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [319856103] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-10 06:40:08,607 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-01-10 06:40:08,607 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2022-01-10 06:40:08,607 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114568359] [2022-01-10 06:40:08,607 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-01-10 06:40:08,609 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-01-10 06:40:08,609 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 06:40:08,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-01-10 06:40:08,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2022-01-10 06:40:08,609 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 23 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 23 states have internal predecessors, (44), 11 states have call successors, (11), 1 states have call predecessors, (11), 9 states have return successors, (18), 9 states have call predecessors, (18), 11 states have call successors, (18) [2022-01-10 06:40:08,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 06:40:08,986 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2022-01-10 06:40:08,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-01-10 06:40:08,987 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 23 states have internal predecessors, (44), 11 states have call successors, (11), 1 states have call predecessors, (11), 9 states have return successors, (18), 9 states have call predecessors, (18), 11 states have call successors, (18) Word has length 58 [2022-01-10 06:40:08,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 06:40:08,988 INFO L225 Difference]: With dead ends: 43 [2022-01-10 06:40:08,988 INFO L226 Difference]: Without dead ends: 39 [2022-01-10 06:40:08,988 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=179, Invalid=813, Unknown=0, NotChecked=0, Total=992 [2022-01-10 06:40:08,989 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 204 mSDsluCounter, 228 mSDsCounter, 0 mSdLazyCounter, 188 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 215 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 278 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 188 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-10 06:40:08,989 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [215 Valid, 252 Invalid, 278 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 188 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-10 06:40:08,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-01-10 06:40:08,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2022-01-10 06:40:08,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 27 states have internal predecessors, (27), 2 states have call successors, (2), 1 states have call predecessors, (2), 10 states have return successors, (11), 10 states have call predecessors, (11), 2 states have call successors, (11) [2022-01-10 06:40:08,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2022-01-10 06:40:08,992 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 58 [2022-01-10 06:40:08,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 06:40:08,993 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2022-01-10 06:40:08,993 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 23 states have internal predecessors, (44), 11 states have call successors, (11), 1 states have call predecessors, (11), 9 states have return successors, (18), 9 states have call predecessors, (18), 11 states have call successors, (18) [2022-01-10 06:40:08,993 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2022-01-10 06:40:08,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-01-10 06:40:08,993 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 06:40:08,994 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 06:40:09,000 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2022-01-10 06:40:09,200 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 06:40:09,200 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 06:40:09,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 06:40:09,201 INFO L85 PathProgramCache]: Analyzing trace with hash -366706730, now seen corresponding path program 9 times [2022-01-10 06:40:09,201 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 06:40:09,201 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1993133107] [2022-01-10 06:40:09,201 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-01-10 06:40:09,201 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 06:40:09,201 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 06:40:09,202 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 06:40:09,208 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2022-01-10 06:40:09,260 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-01-10 06:40:09,260 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-10 06:40:09,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 23 conjunts are in the unsatisfiable core [2022-01-10 06:40:09,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 06:40:09,722 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 8 proven. 126 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2022-01-10 06:40:09,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-10 06:40:13,085 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-01-10 06:40:13,086 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 06:40:13,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1993133107] [2022-01-10 06:40:13,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1993133107] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-10 06:40:13,086 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-01-10 06:40:13,086 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 24] total 27 [2022-01-10 06:40:13,086 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1253164838] [2022-01-10 06:40:13,086 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-01-10 06:40:13,087 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-01-10 06:40:13,087 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 06:40:13,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-01-10 06:40:13,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=616, Unknown=0, NotChecked=0, Total=702 [2022-01-10 06:40:13,087 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 27 states, 23 states have (on average 2.130434782608696) internal successors, (49), 27 states have internal predecessors, (49), 13 states have call successors, (13), 1 states have call predecessors, (13), 10 states have return successors, (20), 10 states have call predecessors, (20), 13 states have call successors, (20) [2022-01-10 06:40:13,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 06:40:13,749 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2022-01-10 06:40:13,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-01-10 06:40:13,749 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 23 states have (on average 2.130434782608696) internal successors, (49), 27 states have internal predecessors, (49), 13 states have call successors, (13), 1 states have call predecessors, (13), 10 states have return successors, (20), 10 states have call predecessors, (20), 13 states have call successors, (20) Word has length 64 [2022-01-10 06:40:13,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 06:40:13,750 INFO L225 Difference]: With dead ends: 46 [2022-01-10 06:40:13,750 INFO L226 Difference]: Without dead ends: 42 [2022-01-10 06:40:13,751 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=244, Invalid=1088, Unknown=0, NotChecked=0, Total=1332 [2022-01-10 06:40:13,751 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 91 mSDsluCounter, 283 mSDsCounter, 0 mSdLazyCounter, 228 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 228 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-10 06:40:13,751 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [103 Valid, 309 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 228 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-10 06:40:13,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-01-10 06:40:13,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2022-01-10 06:40:13,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 28 states have (on average 1.0357142857142858) internal successors, (29), 29 states have internal predecessors, (29), 2 states have call successors, (2), 1 states have call predecessors, (2), 11 states have return successors, (12), 11 states have call predecessors, (12), 2 states have call successors, (12) [2022-01-10 06:40:13,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2022-01-10 06:40:13,755 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 64 [2022-01-10 06:40:13,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 06:40:13,755 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2022-01-10 06:40:13,755 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 23 states have (on average 2.130434782608696) internal successors, (49), 27 states have internal predecessors, (49), 13 states have call successors, (13), 1 states have call predecessors, (13), 10 states have return successors, (20), 10 states have call predecessors, (20), 13 states have call successors, (20) [2022-01-10 06:40:13,755 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2022-01-10 06:40:13,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-01-10 06:40:13,756 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 06:40:13,756 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 06:40:13,764 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2022-01-10 06:40:13,962 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 06:40:13,962 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 06:40:13,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 06:40:13,962 INFO L85 PathProgramCache]: Analyzing trace with hash -1719425780, now seen corresponding path program 10 times [2022-01-10 06:40:13,963 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 06:40:13,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1569531779] [2022-01-10 06:40:13,963 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-01-10 06:40:13,963 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 06:40:13,963 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 06:40:13,964 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 06:40:13,965 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2022-01-10 06:40:14,028 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-01-10 06:40:14,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-10 06:40:14,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 24 conjunts are in the unsatisfiable core [2022-01-10 06:40:14,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 06:40:14,320 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2022-01-10 06:40:14,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-10 06:40:16,834 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 255 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-01-10 06:40:16,835 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 06:40:16,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1569531779] [2022-01-10 06:40:16,835 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1569531779] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-10 06:40:16,835 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-01-10 06:40:16,835 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2022-01-10 06:40:16,835 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136893395] [2022-01-10 06:40:16,835 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-01-10 06:40:16,835 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-01-10 06:40:16,836 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 06:40:16,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-01-10 06:40:16,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2022-01-10 06:40:16,836 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand has 27 states, 25 states have (on average 2.08) internal successors, (52), 27 states have internal predecessors, (52), 13 states have call successors, (13), 1 states have call predecessors, (13), 11 states have return successors, (22), 11 states have call predecessors, (22), 13 states have call successors, (22) [2022-01-10 06:40:17,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 06:40:17,345 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2022-01-10 06:40:17,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-01-10 06:40:17,346 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 25 states have (on average 2.08) internal successors, (52), 27 states have internal predecessors, (52), 13 states have call successors, (13), 1 states have call predecessors, (13), 11 states have return successors, (22), 11 states have call predecessors, (22), 13 states have call successors, (22) Word has length 70 [2022-01-10 06:40:17,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 06:40:17,346 INFO L225 Difference]: With dead ends: 49 [2022-01-10 06:40:17,346 INFO L226 Difference]: Without dead ends: 45 [2022-01-10 06:40:17,347 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=239, Invalid=1167, Unknown=0, NotChecked=0, Total=1406 [2022-01-10 06:40:17,347 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 271 mSDsluCounter, 290 mSDsCounter, 0 mSdLazyCounter, 228 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 284 SdHoareTripleChecker+Valid, 318 SdHoareTripleChecker+Invalid, 349 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 228 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-10 06:40:17,348 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [284 Valid, 318 Invalid, 349 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 228 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-10 06:40:17,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-01-10 06:40:17,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2022-01-10 06:40:17,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 30 states have (on average 1.0333333333333334) internal successors, (31), 31 states have internal predecessors, (31), 2 states have call successors, (2), 1 states have call predecessors, (2), 12 states have return successors, (13), 12 states have call predecessors, (13), 2 states have call successors, (13) [2022-01-10 06:40:17,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2022-01-10 06:40:17,351 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 70 [2022-01-10 06:40:17,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 06:40:17,351 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2022-01-10 06:40:17,351 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 25 states have (on average 2.08) internal successors, (52), 27 states have internal predecessors, (52), 13 states have call successors, (13), 1 states have call predecessors, (13), 11 states have return successors, (22), 11 states have call predecessors, (22), 13 states have call successors, (22) [2022-01-10 06:40:17,351 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2022-01-10 06:40:17,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-01-10 06:40:17,352 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 06:40:17,352 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 06:40:17,361 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2022-01-10 06:40:17,558 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 06:40:17,559 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 06:40:17,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 06:40:17,559 INFO L85 PathProgramCache]: Analyzing trace with hash 1354232598, now seen corresponding path program 11 times [2022-01-10 06:40:17,559 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 06:40:17,559 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1213208137] [2022-01-10 06:40:17,559 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-01-10 06:40:17,560 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 06:40:17,560 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 06:40:17,560 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 06:40:17,561 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2022-01-10 06:40:17,632 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2022-01-10 06:40:17,632 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-10 06:40:17,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 27 conjunts are in the unsatisfiable core [2022-01-10 06:40:17,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 06:40:18,226 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 10 proven. 187 refuted. 0 times theorem prover too weak. 177 trivial. 0 not checked. [2022-01-10 06:40:18,227 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-10 06:40:22,869 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-01-10 06:40:22,869 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 06:40:22,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1213208137] [2022-01-10 06:40:22,869 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1213208137] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-10 06:40:22,870 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-01-10 06:40:22,870 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 28] total 31 [2022-01-10 06:40:22,870 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060028748] [2022-01-10 06:40:22,870 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-01-10 06:40:22,870 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-01-10 06:40:22,870 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 06:40:22,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-01-10 06:40:22,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=830, Unknown=0, NotChecked=0, Total=930 [2022-01-10 06:40:22,871 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand has 31 states, 27 states have (on average 2.111111111111111) internal successors, (57), 31 states have internal predecessors, (57), 15 states have call successors, (15), 1 states have call predecessors, (15), 12 states have return successors, (24), 12 states have call predecessors, (24), 15 states have call successors, (24) [2022-01-10 06:40:23,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 06:40:23,697 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2022-01-10 06:40:23,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-01-10 06:40:23,698 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 27 states have (on average 2.111111111111111) internal successors, (57), 31 states have internal predecessors, (57), 15 states have call successors, (15), 1 states have call predecessors, (15), 12 states have return successors, (24), 12 states have call predecessors, (24), 15 states have call successors, (24) Word has length 76 [2022-01-10 06:40:23,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 06:40:23,699 INFO L225 Difference]: With dead ends: 52 [2022-01-10 06:40:23,699 INFO L226 Difference]: Without dead ends: 48 [2022-01-10 06:40:23,699 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=314, Invalid=1492, Unknown=0, NotChecked=0, Total=1806 [2022-01-10 06:40:23,700 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 38 mSDsluCounter, 357 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 387 SdHoareTripleChecker+Invalid, 280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-10 06:40:23,700 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 387 Invalid, 280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 279 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-10 06:40:23,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-01-10 06:40:23,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2022-01-10 06:40:23,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 32 states have (on average 1.03125) internal successors, (33), 33 states have internal predecessors, (33), 2 states have call successors, (2), 1 states have call predecessors, (2), 13 states have return successors, (14), 13 states have call predecessors, (14), 2 states have call successors, (14) [2022-01-10 06:40:23,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2022-01-10 06:40:23,703 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 76 [2022-01-10 06:40:23,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 06:40:23,704 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2022-01-10 06:40:23,704 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 27 states have (on average 2.111111111111111) internal successors, (57), 31 states have internal predecessors, (57), 15 states have call successors, (15), 1 states have call predecessors, (15), 12 states have return successors, (24), 12 states have call predecessors, (24), 15 states have call successors, (24) [2022-01-10 06:40:23,704 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2022-01-10 06:40:23,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-01-10 06:40:23,704 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 06:40:23,704 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 06:40:23,711 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2022-01-10 06:40:23,907 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 06:40:23,907 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 06:40:23,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 06:40:23,908 INFO L85 PathProgramCache]: Analyzing trace with hash 1734686668, now seen corresponding path program 12 times [2022-01-10 06:40:23,908 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 06:40:23,908 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [278062909] [2022-01-10 06:40:23,908 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-01-10 06:40:23,908 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 06:40:23,908 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 06:40:23,909 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 06:40:23,910 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2022-01-10 06:40:23,993 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2022-01-10 06:40:23,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-10 06:40:23,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 29 conjunts are in the unsatisfiable core [2022-01-10 06:40:23,998 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 06:40:24,667 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 11 proven. 222 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2022-01-10 06:40:24,667 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-10 06:40:29,989 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 366 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-01-10 06:40:29,990 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 06:40:29,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [278062909] [2022-01-10 06:40:29,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [278062909] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-10 06:40:29,990 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-01-10 06:40:29,990 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 30] total 33 [2022-01-10 06:40:29,990 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77188590] [2022-01-10 06:40:29,990 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-01-10 06:40:29,991 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-01-10 06:40:29,991 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 06:40:29,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-01-10 06:40:29,991 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=949, Unknown=0, NotChecked=0, Total=1056 [2022-01-10 06:40:29,991 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand has 33 states, 29 states have (on average 2.103448275862069) internal successors, (61), 33 states have internal predecessors, (61), 16 states have call successors, (16), 1 states have call predecessors, (16), 13 states have return successors, (26), 13 states have call predecessors, (26), 16 states have call successors, (26) [2022-01-10 06:40:30,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 06:40:30,959 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2022-01-10 06:40:30,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-01-10 06:40:30,959 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 29 states have (on average 2.103448275862069) internal successors, (61), 33 states have internal predecessors, (61), 16 states have call successors, (16), 1 states have call predecessors, (16), 13 states have return successors, (26), 13 states have call predecessors, (26), 16 states have call successors, (26) Word has length 82 [2022-01-10 06:40:30,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 06:40:30,960 INFO L225 Difference]: With dead ends: 55 [2022-01-10 06:40:30,960 INFO L226 Difference]: Without dead ends: 51 [2022-01-10 06:40:30,961 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 223 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=352, Invalid=1718, Unknown=0, NotChecked=0, Total=2070 [2022-01-10 06:40:30,961 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 197 mSDsluCounter, 432 mSDsCounter, 0 mSdLazyCounter, 320 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 464 SdHoareTripleChecker+Invalid, 404 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 320 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-10 06:40:30,961 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [212 Valid, 464 Invalid, 404 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 320 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-10 06:40:30,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-01-10 06:40:30,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-01-10 06:40:30,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 34 states have (on average 1.0294117647058822) internal successors, (35), 35 states have internal predecessors, (35), 2 states have call successors, (2), 1 states have call predecessors, (2), 14 states have return successors, (15), 14 states have call predecessors, (15), 2 states have call successors, (15) [2022-01-10 06:40:30,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2022-01-10 06:40:30,965 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 82 [2022-01-10 06:40:30,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 06:40:30,965 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2022-01-10 06:40:30,965 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 29 states have (on average 2.103448275862069) internal successors, (61), 33 states have internal predecessors, (61), 16 states have call successors, (16), 1 states have call predecessors, (16), 13 states have return successors, (26), 13 states have call predecessors, (26), 16 states have call successors, (26) [2022-01-10 06:40:30,965 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2022-01-10 06:40:30,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-01-10 06:40:30,966 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 06:40:30,966 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 06:40:30,975 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2022-01-10 06:40:31,175 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 06:40:31,175 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 06:40:31,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 06:40:31,175 INFO L85 PathProgramCache]: Analyzing trace with hash -1433749930, now seen corresponding path program 13 times [2022-01-10 06:40:31,176 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 06:40:31,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1155621782] [2022-01-10 06:40:31,176 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-01-10 06:40:31,176 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 06:40:31,176 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 06:40:31,177 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 06:40:31,177 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2022-01-10 06:40:31,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-10 06:40:31,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 30 conjunts are in the unsatisfiable core [2022-01-10 06:40:31,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 06:40:31,670 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2022-01-10 06:40:31,670 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-10 06:40:35,468 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-01-10 06:40:35,468 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 06:40:35,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1155621782] [2022-01-10 06:40:35,468 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1155621782] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-10 06:40:35,468 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-01-10 06:40:35,468 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 31] total 33 [2022-01-10 06:40:35,468 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396431314] [2022-01-10 06:40:35,468 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-01-10 06:40:35,469 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-01-10 06:40:35,469 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 06:40:35,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-01-10 06:40:35,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2022-01-10 06:40:35,469 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 33 states, 31 states have (on average 2.064516129032258) internal successors, (64), 33 states have internal predecessors, (64), 16 states have call successors, (16), 1 states have call predecessors, (16), 14 states have return successors, (28), 14 states have call predecessors, (28), 16 states have call successors, (28) [2022-01-10 06:40:36,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 06:40:36,183 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2022-01-10 06:40:36,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-01-10 06:40:36,183 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 31 states have (on average 2.064516129032258) internal successors, (64), 33 states have internal predecessors, (64), 16 states have call successors, (16), 1 states have call predecessors, (16), 14 states have return successors, (28), 14 states have call predecessors, (28), 16 states have call successors, (28) Word has length 88 [2022-01-10 06:40:36,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 06:40:36,184 INFO L225 Difference]: With dead ends: 58 [2022-01-10 06:40:36,184 INFO L226 Difference]: Without dead ends: 54 [2022-01-10 06:40:36,185 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=344, Invalid=1818, Unknown=0, NotChecked=0, Total=2162 [2022-01-10 06:40:36,185 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 367 mSDsluCounter, 469 mSDsCounter, 0 mSdLazyCounter, 347 mSolverCounterSat, 166 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 383 SdHoareTripleChecker+Valid, 503 SdHoareTripleChecker+Invalid, 513 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 166 IncrementalHoareTripleChecker+Valid, 347 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-10 06:40:36,185 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [383 Valid, 503 Invalid, 513 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [166 Valid, 347 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-10 06:40:36,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-01-10 06:40:36,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2022-01-10 06:40:36,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 36 states have (on average 1.0277777777777777) internal successors, (37), 37 states have internal predecessors, (37), 2 states have call successors, (2), 1 states have call predecessors, (2), 15 states have return successors, (16), 15 states have call predecessors, (16), 2 states have call successors, (16) [2022-01-10 06:40:36,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2022-01-10 06:40:36,189 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 88 [2022-01-10 06:40:36,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 06:40:36,189 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2022-01-10 06:40:36,189 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 31 states have (on average 2.064516129032258) internal successors, (64), 33 states have internal predecessors, (64), 16 states have call successors, (16), 1 states have call predecessors, (16), 14 states have return successors, (28), 14 states have call predecessors, (28), 16 states have call successors, (28) [2022-01-10 06:40:36,189 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2022-01-10 06:40:36,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-01-10 06:40:36,190 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 06:40:36,190 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 06:40:36,197 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2022-01-10 06:40:36,394 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 06:40:36,394 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 06:40:36,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 06:40:36,395 INFO L85 PathProgramCache]: Analyzing trace with hash -1321174388, now seen corresponding path program 14 times [2022-01-10 06:40:36,395 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 06:40:36,395 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1064557023] [2022-01-10 06:40:36,395 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-01-10 06:40:36,395 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 06:40:36,396 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 06:40:36,396 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 06:40:36,398 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2022-01-10 06:40:36,487 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-01-10 06:40:36,487 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-10 06:40:36,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 32 conjunts are in the unsatisfiable core [2022-01-10 06:40:36,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 06:40:36,971 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2022-01-10 06:40:36,971 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-10 06:40:41,328 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 497 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-01-10 06:40:41,328 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 06:40:41,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1064557023] [2022-01-10 06:40:41,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1064557023] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-10 06:40:41,328 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-01-10 06:40:41,329 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 33] total 35 [2022-01-10 06:40:41,329 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77349236] [2022-01-10 06:40:41,329 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-01-10 06:40:41,329 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-01-10 06:40:41,329 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 06:40:41,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-01-10 06:40:41,330 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2022-01-10 06:40:41,330 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand has 35 states, 33 states have (on average 2.0606060606060606) internal successors, (68), 35 states have internal predecessors, (68), 17 states have call successors, (17), 1 states have call predecessors, (17), 15 states have return successors, (30), 15 states have call predecessors, (30), 17 states have call successors, (30) [2022-01-10 06:40:42,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 06:40:42,121 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2022-01-10 06:40:42,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-01-10 06:40:42,122 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 33 states have (on average 2.0606060606060606) internal successors, (68), 35 states have internal predecessors, (68), 17 states have call successors, (17), 1 states have call predecessors, (17), 15 states have return successors, (30), 15 states have call predecessors, (30), 17 states have call successors, (30) Word has length 94 [2022-01-10 06:40:42,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 06:40:42,122 INFO L225 Difference]: With dead ends: 61 [2022-01-10 06:40:42,123 INFO L226 Difference]: Without dead ends: 57 [2022-01-10 06:40:42,124 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 225 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=383, Invalid=2067, Unknown=0, NotChecked=0, Total=2450 [2022-01-10 06:40:42,124 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 519 mSDsluCounter, 526 mSDsCounter, 0 mSdLazyCounter, 380 mSolverCounterSat, 241 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 536 SdHoareTripleChecker+Valid, 562 SdHoareTripleChecker+Invalid, 621 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 241 IncrementalHoareTripleChecker+Valid, 380 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-10 06:40:42,125 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [536 Valid, 562 Invalid, 621 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [241 Valid, 380 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-10 06:40:42,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-01-10 06:40:42,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-01-10 06:40:42,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 38 states have (on average 1.0263157894736843) internal successors, (39), 39 states have internal predecessors, (39), 2 states have call successors, (2), 1 states have call predecessors, (2), 16 states have return successors, (17), 16 states have call predecessors, (17), 2 states have call successors, (17) [2022-01-10 06:40:42,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2022-01-10 06:40:42,129 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 94 [2022-01-10 06:40:42,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 06:40:42,129 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2022-01-10 06:40:42,129 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 33 states have (on average 2.0606060606060606) internal successors, (68), 35 states have internal predecessors, (68), 17 states have call successors, (17), 1 states have call predecessors, (17), 15 states have return successors, (30), 15 states have call predecessors, (30), 17 states have call successors, (30) [2022-01-10 06:40:42,130 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2022-01-10 06:40:42,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2022-01-10 06:40:42,130 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 06:40:42,130 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 06:40:42,137 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Ended with exit code 0 [2022-01-10 06:40:42,337 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 06:40:42,337 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 06:40:42,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 06:40:42,337 INFO L85 PathProgramCache]: Analyzing trace with hash 415287702, now seen corresponding path program 15 times [2022-01-10 06:40:42,338 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 06:40:42,338 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1562351834] [2022-01-10 06:40:42,338 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-01-10 06:40:42,338 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 06:40:42,338 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 06:40:42,339 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 06:40:42,341 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2022-01-10 06:40:42,469 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-01-10 06:40:42,469 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-10 06:40:42,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 35 conjunts are in the unsatisfiable core [2022-01-10 06:40:42,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 06:40:43,380 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 14 proven. 345 refuted. 0 times theorem prover too weak. 331 trivial. 0 not checked. [2022-01-10 06:40:43,380 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-10 06:40:51,212 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-01-10 06:40:51,212 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 06:40:51,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1562351834] [2022-01-10 06:40:51,212 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1562351834] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-10 06:40:51,213 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-01-10 06:40:51,213 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 36] total 39 [2022-01-10 06:40:51,213 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111943700] [2022-01-10 06:40:51,213 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-01-10 06:40:51,213 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-01-10 06:40:51,213 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 06:40:51,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-01-10 06:40:51,214 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1354, Unknown=0, NotChecked=0, Total=1482 [2022-01-10 06:40:51,214 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand has 39 states, 35 states have (on average 2.085714285714286) internal successors, (73), 39 states have internal predecessors, (73), 19 states have call successors, (19), 1 states have call predecessors, (19), 16 states have return successors, (32), 16 states have call predecessors, (32), 19 states have call successors, (32) [2022-01-10 06:40:52,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 06:40:52,517 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2022-01-10 06:40:52,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-01-10 06:40:52,518 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 35 states have (on average 2.085714285714286) internal successors, (73), 39 states have internal predecessors, (73), 19 states have call successors, (19), 1 states have call predecessors, (19), 16 states have return successors, (32), 16 states have call predecessors, (32), 19 states have call successors, (32) Word has length 100 [2022-01-10 06:40:52,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 06:40:52,519 INFO L225 Difference]: With dead ends: 64 [2022-01-10 06:40:52,519 INFO L226 Difference]: Without dead ends: 60 [2022-01-10 06:40:52,519 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 322 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=478, Invalid=2492, Unknown=0, NotChecked=0, Total=2970 [2022-01-10 06:40:52,520 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 105 mSDsluCounter, 627 mSDsCounter, 0 mSdLazyCounter, 442 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 665 SdHoareTripleChecker+Invalid, 476 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 442 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-10 06:40:52,520 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [123 Valid, 665 Invalid, 476 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 442 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-10 06:40:52,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-01-10 06:40:52,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2022-01-10 06:40:52,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 40 states have (on average 1.025) internal successors, (41), 41 states have internal predecessors, (41), 2 states have call successors, (2), 1 states have call predecessors, (2), 17 states have return successors, (18), 17 states have call predecessors, (18), 2 states have call successors, (18) [2022-01-10 06:40:52,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2022-01-10 06:40:52,523 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 100 [2022-01-10 06:40:52,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 06:40:52,523 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2022-01-10 06:40:52,523 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 35 states have (on average 2.085714285714286) internal successors, (73), 39 states have internal predecessors, (73), 19 states have call successors, (19), 1 states have call predecessors, (19), 16 states have return successors, (32), 16 states have call predecessors, (32), 19 states have call successors, (32) [2022-01-10 06:40:52,523 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2022-01-10 06:40:52,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2022-01-10 06:40:52,524 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 06:40:52,524 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 06:40:52,536 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2022-01-10 06:40:52,734 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 06:40:52,735 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 06:40:52,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 06:40:52,735 INFO L85 PathProgramCache]: Analyzing trace with hash 317812044, now seen corresponding path program 16 times [2022-01-10 06:40:52,735 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 06:40:52,735 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [546121320] [2022-01-10 06:40:52,735 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-01-10 06:40:52,735 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 06:40:52,736 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 06:40:52,736 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 06:40:52,738 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2022-01-10 06:40:52,842 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-01-10 06:40:52,843 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-10 06:40:52,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 36 conjunts are in the unsatisfiable core [2022-01-10 06:40:52,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 06:40:53,390 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2022-01-10 06:40:53,390 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-10 06:40:58,857 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 648 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2022-01-10 06:40:58,857 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 06:40:58,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [546121320] [2022-01-10 06:40:58,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [546121320] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-10 06:40:58,858 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-01-10 06:40:58,858 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 37] total 39 [2022-01-10 06:40:58,858 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [327274285] [2022-01-10 06:40:58,858 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-01-10 06:40:58,858 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-01-10 06:40:58,858 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 06:40:58,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-01-10 06:40:58,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2022-01-10 06:40:58,859 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand has 39 states, 37 states have (on average 2.054054054054054) internal successors, (76), 39 states have internal predecessors, (76), 19 states have call successors, (19), 1 states have call predecessors, (19), 17 states have return successors, (34), 17 states have call predecessors, (34), 19 states have call successors, (34) [2022-01-10 06:40:59,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 06:40:59,777 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2022-01-10 06:40:59,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-01-10 06:40:59,777 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 37 states have (on average 2.054054054054054) internal successors, (76), 39 states have internal predecessors, (76), 19 states have call successors, (19), 1 states have call predecessors, (19), 17 states have return successors, (34), 17 states have call predecessors, (34), 19 states have call successors, (34) Word has length 106 [2022-01-10 06:40:59,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 06:40:59,778 INFO L225 Difference]: With dead ends: 67 [2022-01-10 06:40:59,778 INFO L226 Difference]: Without dead ends: 63 [2022-01-10 06:40:59,779 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 173 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 289 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=467, Invalid=2613, Unknown=0, NotChecked=0, Total=3080 [2022-01-10 06:40:59,779 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 115 mSDsluCounter, 664 mSDsCounter, 0 mSdLazyCounter, 464 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 704 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 464 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-10 06:40:59,779 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [134 Valid, 704 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 464 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-10 06:40:59,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-01-10 06:40:59,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2022-01-10 06:40:59,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 42 states have (on average 1.0238095238095237) internal successors, (43), 43 states have internal predecessors, (43), 2 states have call successors, (2), 1 states have call predecessors, (2), 18 states have return successors, (19), 18 states have call predecessors, (19), 2 states have call successors, (19) [2022-01-10 06:40:59,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2022-01-10 06:40:59,782 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 106 [2022-01-10 06:40:59,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 06:40:59,783 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2022-01-10 06:40:59,783 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 37 states have (on average 2.054054054054054) internal successors, (76), 39 states have internal predecessors, (76), 19 states have call successors, (19), 1 states have call predecessors, (19), 17 states have return successors, (34), 17 states have call predecessors, (34), 19 states have call successors, (34) [2022-01-10 06:40:59,783 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2022-01-10 06:40:59,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2022-01-10 06:40:59,783 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 06:40:59,783 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 06:40:59,791 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2022-01-10 06:40:59,991 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 06:40:59,991 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 06:40:59,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 06:40:59,992 INFO L85 PathProgramCache]: Analyzing trace with hash -2122437418, now seen corresponding path program 17 times [2022-01-10 06:40:59,992 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 06:40:59,992 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1534559452] [2022-01-10 06:40:59,992 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-01-10 06:40:59,992 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 06:40:59,992 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 06:40:59,993 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 06:40:59,998 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2022-01-10 06:41:00,164 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2022-01-10 06:41:00,165 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-10 06:41:00,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 39 conjunts are in the unsatisfiable core [2022-01-10 06:41:00,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 06:41:01,261 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 16 proven. 442 refuted. 0 times theorem prover too weak. 426 trivial. 0 not checked. [2022-01-10 06:41:01,262 INFO L328 TraceCheckSpWp]: Computing backward predicates...