/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/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loops/compact.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 12:45:53,172 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 12:45:53,174 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 12:45:53,218 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-03-20 12:45:53,219 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-03-20 12:45:53,221 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-03-20 12:45:53,224 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-03-20 12:45:53,226 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-03-20 12:45:53,228 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-03-20 12:45:53,232 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-03-20 12:45:53,233 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-03-20 12:45:53,234 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-03-20 12:45:53,235 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-03-20 12:45:53,237 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-03-20 12:45:53,238 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-03-20 12:45:53,240 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-03-20 12:45:53,241 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-03-20 12:45:53,243 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-03-20 12:45:53,245 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-03-20 12:45:53,251 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-03-20 12:45:53,253 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-03-20 12:45:53,254 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-03-20 12:45:53,255 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-03-20 12:45:53,256 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-03-20 12:45:53,257 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-03-20 12:45:53,263 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-03-20 12:45:53,263 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-03-20 12:45:53,264 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-03-20 12:45:53,264 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-03-20 12:45:53,265 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-03-20 12:45:53,266 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-03-20 12:45:53,266 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-03-20 12:45:53,268 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-03-20 12:45:53,268 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-03-20 12:45:53,269 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-03-20 12:45:53,270 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-03-20 12:45:53,270 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-03-20 12:45:53,271 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-03-20 12:45:53,271 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-03-20 12:45:53,271 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 12:45:53,272 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 12:45:53,273 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 12:45:53,274 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2022-03-20 12:45:53,285 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 12:45:53,285 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 12:45:53,288 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 12:45:53,288 INFO L138 SettingsManager]: * sizeof long=4 [2022-03-20 12:45:53,288 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 12:45:53,288 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-03-20 12:45:53,288 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 12:45:53,288 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 12:45:53,289 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 12:45:53,289 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 12:45:53,289 INFO L138 SettingsManager]: * sizeof long double=12 [2022-03-20 12:45:53,290 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 12:45:53,290 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 12:45:53,290 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 12:45:53,290 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 12:45:53,290 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 12:45:53,290 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 12:45:53,291 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 12:45:53,291 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 12:45:53,291 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 12:45:53,291 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 12:45:53,291 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 12:45:53,291 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 12:45:53,292 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 12:45:53,292 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-03-20 12:45:53,292 INFO L138 SettingsManager]: * Use separate solver for trace checks=false 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 12:45:53,522 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 12:45:53,545 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 12:45:53,547 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 12:45:53,548 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 12:45:53,548 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 12:45:53,549 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/compact.c [2022-03-20 12:45:53,613 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/57c769d55/07c33174b6a14719b2d12a16b7e7bf86/FLAGb77188a9e [2022-03-20 12:45:54,012 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 12:45:54,013 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/compact.c [2022-03-20 12:45:54,018 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/57c769d55/07c33174b6a14719b2d12a16b7e7bf86/FLAGb77188a9e [2022-03-20 12:45:54,028 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/57c769d55/07c33174b6a14719b2d12a16b7e7bf86 [2022-03-20 12:45:54,031 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 12:45:54,032 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 12:45:54,033 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 12:45:54,033 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 12:45:54,036 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 12:45:54,037 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 12:45:54" (1/1) ... [2022-03-20 12:45:54,038 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@74b0ba0d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 12:45:54, skipping insertion in model container [2022-03-20 12:45:54,038 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 12:45:54" (1/1) ... [2022-03-20 12:45:54,044 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 12:45:54,054 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 12:45:54,242 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/compact.c[609,622] [2022-03-20 12:45:54,245 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 12:45:54,253 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 12:45:54,269 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/compact.c[609,622] [2022-03-20 12:45:54,274 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 12:45:54,289 INFO L208 MainTranslator]: Completed translation [2022-03-20 12:45:54,289 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 12:45:54 WrapperNode [2022-03-20 12:45:54,290 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 12:45:54,291 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 12:45:54,291 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 12:45:54,291 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 12:45:54,301 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 12:45:54" (1/1) ... [2022-03-20 12:45:54,301 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 12:45:54" (1/1) ... [2022-03-20 12:45:54,308 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 12:45:54" (1/1) ... [2022-03-20 12:45:54,309 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 12:45:54" (1/1) ... [2022-03-20 12:45:54,318 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 12:45:54" (1/1) ... [2022-03-20 12:45:54,323 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 12:45:54" (1/1) ... [2022-03-20 12:45:54,328 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 12:45:54" (1/1) ... [2022-03-20 12:45:54,332 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 12:45:54,333 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 12:45:54,334 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 12:45:54,334 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 12:45:54,334 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 12:45:54" (1/1) ... [2022-03-20 12:45:54,341 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 12:45:54,351 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:45:54,364 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) [2022-03-20 12:45:54,378 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 [2022-03-20 12:45:54,409 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 12:45:54,409 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 12:45:54,410 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 12:45:54,410 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 12:45:54,410 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 12:45:54,410 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 12:45:54,410 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 12:45:54,410 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 12:45:54,411 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2022-03-20 12:45:54,411 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 12:45:54,411 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 12:45:54,412 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 12:45:54,412 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 12:45:54,412 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 12:45:54,413 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 12:45:54,413 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 12:45:54,494 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 12:45:54,496 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 12:45:54,633 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 12:45:54,646 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 12:45:54,646 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-03-20 12:45:54,647 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 12:45:54 BoogieIcfgContainer [2022-03-20 12:45:54,648 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 12:45:54,649 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 12:45:54,649 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 12:45:54,656 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 12:45:54,656 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 12:45:54" (1/3) ... [2022-03-20 12:45:54,657 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5fbe8f7c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 12:45:54, skipping insertion in model container [2022-03-20 12:45:54,657 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 12:45:54" (2/3) ... [2022-03-20 12:45:54,658 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5fbe8f7c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 12:45:54, skipping insertion in model container [2022-03-20 12:45:54,658 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 12:45:54" (3/3) ... [2022-03-20 12:45:54,659 INFO L111 eAbstractionObserver]: Analyzing ICFG compact.c [2022-03-20 12:45:54,663 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 12:45:54,663 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 12:45:54,709 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 12:45:54,715 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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 [2022-03-20 12:45:54,716 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 12:45:54,727 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 12 states have (on average 1.5) internal successors, (18), 13 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 12:45:54,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-03-20 12:45:54,736 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:45:54,737 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:45:54,738 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:45:54,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:45:54,743 INFO L85 PathProgramCache]: Analyzing trace with hash 927625408, now seen corresponding path program 1 times [2022-03-20 12:45:54,749 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:45:54,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1595909206] [2022-03-20 12:45:54,757 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 12:45:54,758 INFO L85 PathProgramCache]: Analyzing trace with hash 927625408, now seen corresponding path program 2 times [2022-03-20 12:45:54,759 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:45:54,760 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823518937] [2022-03-20 12:45:54,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:45:54,761 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:45:54,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:45:54,964 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:45:54,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:45:54,982 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:45:54,983 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:45:54,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823518937] [2022-03-20 12:45:54,984 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1823518937] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:45:54,985 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:45:54,985 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 12:45:54,987 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:45:54,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1595909206] [2022-03-20 12:45:54,988 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1595909206] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:45:54,988 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:45:54,988 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 12:45:54,988 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2040608629] [2022-03-20 12:45:54,989 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:45:54,992 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-20 12:45:54,993 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:45:55,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-20 12:45:55,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 12:45:55,023 INFO L87 Difference]: Start difference. First operand has 18 states, 12 states have (on average 1.5) internal successors, (18), 13 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:45:55,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:45:55,096 INFO L93 Difference]: Finished difference Result 37 states and 48 transitions. [2022-03-20 12:45:55,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-20 12:45:55,098 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2022-03-20 12:45:55,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:45:55,107 INFO L225 Difference]: With dead ends: 37 [2022-03-20 12:45:55,108 INFO L226 Difference]: Without dead ends: 21 [2022-03-20 12:45:55,110 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 12:45:55,114 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 10 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 12:45:55,115 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 19 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 12:45:55,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-03-20 12:45:55,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 14. [2022-03-20 12:45:55,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:45:55,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2022-03-20 12:45:55,152 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2022-03-20 12:45:55,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:45:55,152 INFO L478 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2022-03-20 12:45:55,153 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:45:55,153 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2022-03-20 12:45:55,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-03-20 12:45:55,153 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:45:55,154 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:45:55,154 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 12:45:55,154 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:45:55,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:45:55,157 INFO L85 PathProgramCache]: Analyzing trace with hash 927446352, now seen corresponding path program 1 times [2022-03-20 12:45:55,157 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:45:55,158 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [708837164] [2022-03-20 12:45:55,160 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 12:45:55,160 INFO L85 PathProgramCache]: Analyzing trace with hash 927446352, now seen corresponding path program 2 times [2022-03-20 12:45:55,161 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:45:55,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [245672689] [2022-03-20 12:45:55,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:45:55,165 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:45:55,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:45:55,255 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:45:55,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:45:55,284 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:45:55,284 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:45:55,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [245672689] [2022-03-20 12:45:55,285 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [245672689] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:45:55,285 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:45:55,285 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 12:45:55,285 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:45:55,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [708837164] [2022-03-20 12:45:55,286 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [708837164] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:45:55,286 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:45:55,286 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 12:45:55,286 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971736333] [2022-03-20 12:45:55,286 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:45:55,287 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-20 12:45:55,287 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:45:55,287 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-20 12:45:55,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-20 12:45:55,287 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:45:55,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:45:55,343 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2022-03-20 12:45:55,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 12:45:55,344 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2022-03-20 12:45:55,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:45:55,345 INFO L225 Difference]: With dead ends: 25 [2022-03-20 12:45:55,346 INFO L226 Difference]: Without dead ends: 19 [2022-03-20 12:45:55,346 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-03-20 12:45:55,349 INFO L913 BasicCegarLoop]: 10 mSDtfsCounter, 3 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 12:45:55,352 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 18 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 12:45:55,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-03-20 12:45:55,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 16. [2022-03-20 12:45:55,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:45:55,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2022-03-20 12:45:55,368 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 10 [2022-03-20 12:45:55,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:45:55,368 INFO L478 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2022-03-20 12:45:55,369 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:45:55,369 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2022-03-20 12:45:55,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-20 12:45:55,370 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:45:55,370 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:45:55,370 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-20 12:45:55,372 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:45:55,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:45:55,374 INFO L85 PathProgramCache]: Analyzing trace with hash 706936613, now seen corresponding path program 1 times [2022-03-20 12:45:55,374 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:45:55,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1488652674] [2022-03-20 12:45:55,392 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:45:55,392 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:45:55,392 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:45:55,393 INFO L85 PathProgramCache]: Analyzing trace with hash 706936613, now seen corresponding path program 2 times [2022-03-20 12:45:55,393 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:45:55,393 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [874164675] [2022-03-20 12:45:55,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:45:55,393 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:45:55,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:45:55,518 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:45:55,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:45:55,530 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 12:45:55,531 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:45:55,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [874164675] [2022-03-20 12:45:55,531 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [874164675] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:45:55,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [591269067] [2022-03-20 12:45:55,531 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:45:55,531 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:45:55,532 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:45:55,533 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:45:55,534 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-20 12:45:55,611 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:45:55,612 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:45:55,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 5 conjunts are in the unsatisfiable core [2022-03-20 12:45:55,616 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:45:55,668 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 12:45:55,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:45:55,718 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 12:45:55,719 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [591269067] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:45:55,719 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:45:55,719 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 8 [2022-03-20 12:45:55,720 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:45:55,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1488652674] [2022-03-20 12:45:55,720 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1488652674] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:45:55,720 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:45:55,720 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 12:45:55,720 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91909057] [2022-03-20 12:45:55,720 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:45:55,720 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 12:45:55,721 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:45:55,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 12:45:55,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2022-03-20 12:45:55,721 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:45:55,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:45:55,766 INFO L93 Difference]: Finished difference Result 31 states and 34 transitions. [2022-03-20 12:45:55,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 12:45:55,767 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-03-20 12:45:55,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:45:55,767 INFO L225 Difference]: With dead ends: 31 [2022-03-20 12:45:55,767 INFO L226 Difference]: Without dead ends: 24 [2022-03-20 12:45:55,768 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-03-20 12:45:55,768 INFO L913 BasicCegarLoop]: 10 mSDtfsCounter, 6 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 12:45:55,769 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 24 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 12:45:55,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-03-20 12:45:55,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2022-03-20 12:45:55,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:45:55,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2022-03-20 12:45:55,774 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 15 [2022-03-20 12:45:55,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:45:55,774 INFO L478 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2022-03-20 12:45:55,774 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:45:55,774 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2022-03-20 12:45:55,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-20 12:45:55,775 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:45:55,775 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:45:55,818 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-20 12:45:55,991 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:45:55,992 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:45:55,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:45:55,992 INFO L85 PathProgramCache]: Analyzing trace with hash -1962996172, now seen corresponding path program 3 times [2022-03-20 12:45:55,992 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:45:55,992 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [278711644] [2022-03-20 12:45:55,995 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:45:55,995 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:45:55,995 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:45:55,995 INFO L85 PathProgramCache]: Analyzing trace with hash -1962996172, now seen corresponding path program 4 times [2022-03-20 12:45:55,995 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:45:55,995 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [11157227] [2022-03-20 12:45:55,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:45:55,996 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:45:56,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:45:56,103 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:45:56,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:45:56,120 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-03-20 12:45:56,120 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:45:56,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [11157227] [2022-03-20 12:45:56,121 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [11157227] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:45:56,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [950385783] [2022-03-20 12:45:56,121 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:45:56,121 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:45:56,122 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:45:56,124 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:45:56,143 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-20 12:45:56,191 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:45:56,191 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:45:56,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 12:45:56,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:45:56,334 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-03-20 12:45:56,334 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:45:56,436 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-03-20 12:45:56,437 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [950385783] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:45:56,437 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:45:56,437 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 10 [2022-03-20 12:45:56,437 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:45:56,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [278711644] [2022-03-20 12:45:56,437 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [278711644] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:45:56,437 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:45:56,438 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 12:45:56,438 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620729319] [2022-03-20 12:45:56,442 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:45:56,443 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 12:45:56,444 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:45:56,446 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 12:45:56,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2022-03-20 12:45:56,447 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:45:56,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:45:56,525 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2022-03-20 12:45:56,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 12:45:56,525 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2022-03-20 12:45:56,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:45:56,526 INFO L225 Difference]: With dead ends: 39 [2022-03-20 12:45:56,526 INFO L226 Difference]: Without dead ends: 29 [2022-03-20 12:45:56,527 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2022-03-20 12:45:56,527 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 13 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 12:45:56,528 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 21 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 12:45:56,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-20 12:45:56,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2022-03-20 12:45:56,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:45:56,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2022-03-20 12:45:56,536 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 20 [2022-03-20 12:45:56,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:45:56,536 INFO L478 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2022-03-20 12:45:56,536 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:45:56,536 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2022-03-20 12:45:56,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-20 12:45:56,537 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:45:56,538 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:45:56,566 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-20 12:45:56,763 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2022-03-20 12:45:56,763 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:45:56,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:45:56,764 INFO L85 PathProgramCache]: Analyzing trace with hash -436810175, now seen corresponding path program 5 times [2022-03-20 12:45:56,764 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:45:56,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [815470443] [2022-03-20 12:45:56,766 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:45:56,766 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:45:56,766 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:45:56,766 INFO L85 PathProgramCache]: Analyzing trace with hash -436810175, now seen corresponding path program 6 times [2022-03-20 12:45:56,766 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:45:56,766 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2078615105] [2022-03-20 12:45:56,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:45:56,767 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:45:56,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:45:56,895 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:45:56,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:45:56,901 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 12:45:56,901 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:45:56,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2078615105] [2022-03-20 12:45:56,901 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2078615105] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:45:56,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1227662693] [2022-03-20 12:45:56,902 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:45:56,902 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:45:56,902 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:45:56,903 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:45:56,904 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-20 12:45:56,973 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-20 12:45:56,973 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:45:56,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 17 conjunts are in the unsatisfiable core [2022-03-20 12:45:56,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:45:57,066 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 12:45:57,067 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:45:57,196 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 12:45:57,196 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1227662693] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:45:57,197 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:45:57,197 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 12 [2022-03-20 12:45:57,197 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:45:57,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [815470443] [2022-03-20 12:45:57,197 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [815470443] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:45:57,197 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:45:57,197 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 12:45:57,197 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151030100] [2022-03-20 12:45:57,198 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:45:57,198 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 12:45:57,198 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:45:57,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 12:45:57,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2022-03-20 12:45:57,199 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:45:57,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:45:57,285 INFO L93 Difference]: Finished difference Result 47 states and 50 transitions. [2022-03-20 12:45:57,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 12:45:57,285 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2022-03-20 12:45:57,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:45:57,286 INFO L225 Difference]: With dead ends: 47 [2022-03-20 12:45:57,286 INFO L226 Difference]: Without dead ends: 34 [2022-03-20 12:45:57,287 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2022-03-20 12:45:57,288 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 16 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:45:57,289 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 31 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:45:57,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-03-20 12:45:57,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 31. [2022-03-20 12:45:57,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 27 states have internal predecessors, (29), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:45:57,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2022-03-20 12:45:57,302 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 25 [2022-03-20 12:45:57,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:45:57,302 INFO L478 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2022-03-20 12:45:57,302 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:45:57,302 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2022-03-20 12:45:57,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-03-20 12:45:57,303 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:45:57,303 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:45:57,329 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-20 12:45:57,518 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:45:57,519 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:45:57,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:45:57,520 INFO L85 PathProgramCache]: Analyzing trace with hash 329033496, now seen corresponding path program 7 times [2022-03-20 12:45:57,520 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:45:57,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1186965801] [2022-03-20 12:45:57,521 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:45:57,522 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:45:57,522 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:45:57,522 INFO L85 PathProgramCache]: Analyzing trace with hash 329033496, now seen corresponding path program 8 times [2022-03-20 12:45:57,522 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:45:57,522 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1568571918] [2022-03-20 12:45:57,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:45:57,522 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:45:57,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:45:57,673 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:45:57,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:45:57,682 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-03-20 12:45:57,682 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:45:57,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1568571918] [2022-03-20 12:45:57,683 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1568571918] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:45:57,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [300327785] [2022-03-20 12:45:57,683 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:45:57,683 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:45:57,683 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:45:57,685 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:45:57,687 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-20 12:45:57,765 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:45:57,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:45:57,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 12:45:57,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:45:57,900 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 12:45:57,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:45:58,038 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 12:45:58,038 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [300327785] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:45:58,038 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:45:58,038 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 14 [2022-03-20 12:45:58,039 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:45:58,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1186965801] [2022-03-20 12:45:58,039 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1186965801] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:45:58,039 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:45:58,039 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 12:45:58,039 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [409120529] [2022-03-20 12:45:58,039 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:45:58,040 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 12:45:58,040 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:45:58,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 12:45:58,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=122, Unknown=0, NotChecked=0, Total=182 [2022-03-20 12:45:58,041 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:45:58,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:45:58,147 INFO L93 Difference]: Finished difference Result 55 states and 58 transitions. [2022-03-20 12:45:58,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 12:45:58,148 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2022-03-20 12:45:58,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:45:58,149 INFO L225 Difference]: With dead ends: 55 [2022-03-20 12:45:58,149 INFO L226 Difference]: Without dead ends: 39 [2022-03-20 12:45:58,150 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2022-03-20 12:45:58,152 INFO L913 BasicCegarLoop]: 13 mSDtfsCounter, 23 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:45:58,152 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 33 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:45:58,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-03-20 12:45:58,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2022-03-20 12:45:58,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 32 states have (on average 1.0625) internal successors, (34), 32 states have internal predecessors, (34), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:45:58,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2022-03-20 12:45:58,162 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 30 [2022-03-20 12:45:58,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:45:58,162 INFO L478 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2022-03-20 12:45:58,162 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:45:58,162 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2022-03-20 12:45:58,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-20 12:45:58,163 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:45:58,163 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:45:58,191 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-20 12:45:58,389 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:45:58,389 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:45:58,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:45:58,390 INFO L85 PathProgramCache]: Analyzing trace with hash 1926970717, now seen corresponding path program 9 times [2022-03-20 12:45:58,390 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:45:58,390 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [197409038] [2022-03-20 12:45:58,392 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:45:58,393 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:45:58,393 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:45:58,393 INFO L85 PathProgramCache]: Analyzing trace with hash 1926970717, now seen corresponding path program 10 times [2022-03-20 12:45:58,393 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:45:58,393 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [757609967] [2022-03-20 12:45:58,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:45:58,394 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:45:58,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:45:58,538 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:45:58,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:45:58,547 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-03-20 12:45:58,548 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:45:58,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [757609967] [2022-03-20 12:45:58,548 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [757609967] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:45:58,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1794796700] [2022-03-20 12:45:58,548 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:45:58,548 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:45:58,549 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:45:58,550 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:45:58,551 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-20 12:45:58,610 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:45:58,610 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:45:58,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 13 conjunts are in the unsatisfiable core [2022-03-20 12:45:58,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:45:58,707 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-03-20 12:45:58,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:45:58,849 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-03-20 12:45:58,850 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1794796700] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:45:58,850 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:45:58,850 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 16 [2022-03-20 12:45:58,850 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:45:58,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [197409038] [2022-03-20 12:45:58,851 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [197409038] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:45:58,851 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:45:58,851 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 12:45:58,851 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133797930] [2022-03-20 12:45:58,851 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:45:58,851 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 12:45:58,851 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:45:58,852 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 12:45:58,852 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=163, Unknown=0, NotChecked=0, Total=240 [2022-03-20 12:45:58,852 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:45:58,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:45:58,969 INFO L93 Difference]: Finished difference Result 63 states and 66 transitions. [2022-03-20 12:45:58,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 12:45:58,969 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2022-03-20 12:45:58,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:45:58,970 INFO L225 Difference]: With dead ends: 63 [2022-03-20 12:45:58,970 INFO L226 Difference]: Without dead ends: 44 [2022-03-20 12:45:58,970 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2022-03-20 12:45:58,971 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 26 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:45:58,971 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 47 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:45:58,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-03-20 12:45:58,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 41. [2022-03-20 12:45:58,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 37 states have (on average 1.054054054054054) internal successors, (39), 37 states have internal predecessors, (39), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:45:58,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2022-03-20 12:45:58,978 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 35 [2022-03-20 12:45:58,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:45:58,978 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2022-03-20 12:45:58,978 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:45:58,978 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2022-03-20 12:45:58,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-03-20 12:45:58,979 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:45:58,979 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:45:59,004 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-20 12:45:59,179 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:45:59,180 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:45:59,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:45:59,180 INFO L85 PathProgramCache]: Analyzing trace with hash 261275644, now seen corresponding path program 11 times [2022-03-20 12:45:59,180 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:45:59,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1551597894] [2022-03-20 12:45:59,182 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:45:59,182 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:45:59,182 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:45:59,183 INFO L85 PathProgramCache]: Analyzing trace with hash 261275644, now seen corresponding path program 12 times [2022-03-20 12:45:59,183 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:45:59,183 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1065178578] [2022-03-20 12:45:59,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:45:59,183 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:45:59,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:45:59,321 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:45:59,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:45:59,331 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-03-20 12:45:59,332 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:45:59,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1065178578] [2022-03-20 12:45:59,332 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1065178578] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:45:59,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [200969273] [2022-03-20 12:45:59,332 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:45:59,332 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:45:59,333 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:45:59,334 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:45:59,335 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-20 12:45:59,671 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 12:45:59,672 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:45:59,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 36 conjunts are in the unsatisfiable core [2022-03-20 12:45:59,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:45:59,881 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 2 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:45:59,881 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:46:00,406 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 12:46:00,407 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [200969273] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:46:00,407 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:46:00,407 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 10] total 20 [2022-03-20 12:46:00,407 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:46:00,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1551597894] [2022-03-20 12:46:00,407 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1551597894] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:46:00,408 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:46:00,408 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 12:46:00,408 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1973750207] [2022-03-20 12:46:00,408 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:46:00,408 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 12:46:00,408 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:46:00,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 12:46:00,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=265, Unknown=0, NotChecked=0, Total=380 [2022-03-20 12:46:00,409 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:00,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:46:00,550 INFO L93 Difference]: Finished difference Result 71 states and 74 transitions. [2022-03-20 12:46:00,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 12:46:00,551 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2022-03-20 12:46:00,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:46:00,551 INFO L225 Difference]: With dead ends: 71 [2022-03-20 12:46:00,551 INFO L226 Difference]: Without dead ends: 49 [2022-03-20 12:46:00,552 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 67 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=128, Invalid=292, Unknown=0, NotChecked=0, Total=420 [2022-03-20 12:46:00,552 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 21 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 233 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:46:00,553 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 83 Invalid, 233 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 217 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:46:00,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-03-20 12:46:00,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2022-03-20 12:46:00,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 states have internal predecessors, (44), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:00,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2022-03-20 12:46:00,559 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 40 [2022-03-20 12:46:00,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:46:00,559 INFO L478 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2022-03-20 12:46:00,560 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:00,560 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2022-03-20 12:46:00,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-03-20 12:46:00,560 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:46:00,560 INFO L499 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:46:00,569 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-20 12:46:00,761 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:46:00,761 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:46:00,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:46:00,762 INFO L85 PathProgramCache]: Analyzing trace with hash -1323430791, now seen corresponding path program 13 times [2022-03-20 12:46:00,762 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:46:00,762 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2089565996] [2022-03-20 12:46:00,763 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:46:00,764 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:46:00,764 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:46:00,764 INFO L85 PathProgramCache]: Analyzing trace with hash -1323430791, now seen corresponding path program 14 times [2022-03-20 12:46:00,764 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:46:00,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1788206141] [2022-03-20 12:46:00,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:46:00,764 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:46:00,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:46:00,891 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:46:00,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:46:00,896 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-03-20 12:46:00,897 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:46:00,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1788206141] [2022-03-20 12:46:00,897 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1788206141] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:46:00,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [232901897] [2022-03-20 12:46:00,897 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:46:00,897 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:46:00,898 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:46:00,899 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:46:00,923 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-20 12:46:01,010 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:46:01,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:46:01,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 17 conjunts are in the unsatisfiable core [2022-03-20 12:46:01,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:46:01,138 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-03-20 12:46:01,138 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:46:01,344 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-03-20 12:46:01,345 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [232901897] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:46:01,345 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:46:01,345 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 20 [2022-03-20 12:46:01,345 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:46:01,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2089565996] [2022-03-20 12:46:01,345 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2089565996] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:46:01,345 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:46:01,346 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 12:46:01,346 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338272158] [2022-03-20 12:46:01,346 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:46:01,346 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 12:46:01,346 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:46:01,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 12:46:01,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=263, Unknown=0, NotChecked=0, Total=380 [2022-03-20 12:46:01,347 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 10 states have internal predecessors, (24), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:01,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:46:01,530 INFO L93 Difference]: Finished difference Result 79 states and 82 transitions. [2022-03-20 12:46:01,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 12:46:01,530 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 10 states have internal predecessors, (24), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2022-03-20 12:46:01,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:46:01,531 INFO L225 Difference]: With dead ends: 79 [2022-03-20 12:46:01,531 INFO L226 Difference]: Without dead ends: 54 [2022-03-20 12:46:01,532 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=130, Invalid=290, Unknown=0, NotChecked=0, Total=420 [2022-03-20 12:46:01,532 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 32 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 267 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 267 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 12:46:01,532 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 81 Invalid, 289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 267 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 12:46:01,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-03-20 12:46:01,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 51. [2022-03-20 12:46:01,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 47 states have internal predecessors, (49), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:01,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2022-03-20 12:46:01,539 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 45 [2022-03-20 12:46:01,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:46:01,539 INFO L478 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2022-03-20 12:46:01,539 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 10 states have internal predecessors, (24), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:01,540 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2022-03-20 12:46:01,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-03-20 12:46:01,540 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:46:01,540 INFO L499 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:46:01,568 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-20 12:46:01,763 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:46:01,764 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:46:01,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:46:01,764 INFO L85 PathProgramCache]: Analyzing trace with hash 416520416, now seen corresponding path program 15 times [2022-03-20 12:46:01,764 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:46:01,765 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1627489187] [2022-03-20 12:46:01,766 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:46:01,766 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:46:01,766 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:46:01,767 INFO L85 PathProgramCache]: Analyzing trace with hash 416520416, now seen corresponding path program 16 times [2022-03-20 12:46:01,767 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:46:01,767 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1154211189] [2022-03-20 12:46:01,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:46:01,767 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:46:01,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:46:01,916 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:46:01,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:46:01,921 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-03-20 12:46:01,921 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:46:01,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1154211189] [2022-03-20 12:46:01,921 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1154211189] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:46:01,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [524401695] [2022-03-20 12:46:01,921 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:46:01,922 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:46:01,922 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:46:01,923 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:46:01,924 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-20 12:46:02,034 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:46:02,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:46:02,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 19 conjunts are in the unsatisfiable core [2022-03-20 12:46:02,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:46:02,175 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2022-03-20 12:46:02,176 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:46:02,431 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2022-03-20 12:46:02,432 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [524401695] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:46:02,432 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:46:02,432 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 22 [2022-03-20 12:46:02,432 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:46:02,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1627489187] [2022-03-20 12:46:02,433 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1627489187] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:46:02,433 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:46:02,433 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 12:46:02,433 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928921067] [2022-03-20 12:46:02,433 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:46:02,434 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 12:46:02,434 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:46:02,435 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 12:46:02,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=322, Unknown=0, NotChecked=0, Total=462 [2022-03-20 12:46:02,435 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 11 states have internal predecessors, (26), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:02,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:46:02,636 INFO L93 Difference]: Finished difference Result 87 states and 90 transitions. [2022-03-20 12:46:02,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 12:46:02,636 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 11 states have internal predecessors, (26), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2022-03-20 12:46:02,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:46:02,637 INFO L225 Difference]: With dead ends: 87 [2022-03-20 12:46:02,637 INFO L226 Difference]: Without dead ends: 59 [2022-03-20 12:46:02,637 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 91 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2022-03-20 12:46:02,638 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 31 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 343 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 365 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 343 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 12:46:02,638 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 111 Invalid, 365 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 343 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 12:46:02,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-03-20 12:46:02,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2022-03-20 12:46:02,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 52 states have (on average 1.0384615384615385) internal successors, (54), 52 states have internal predecessors, (54), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:02,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2022-03-20 12:46:02,644 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 50 [2022-03-20 12:46:02,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:46:02,644 INFO L478 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2022-03-20 12:46:02,644 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 11 states have internal predecessors, (26), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:02,644 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2022-03-20 12:46:02,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-03-20 12:46:02,645 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:46:02,645 INFO L499 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:46:02,674 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-20 12:46:02,871 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-03-20 12:46:02,872 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:46:02,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:46:02,872 INFO L85 PathProgramCache]: Analyzing trace with hash -208864363, now seen corresponding path program 17 times [2022-03-20 12:46:02,872 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:46:02,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [389222909] [2022-03-20 12:46:02,874 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:46:02,874 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:46:02,874 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:46:02,874 INFO L85 PathProgramCache]: Analyzing trace with hash -208864363, now seen corresponding path program 18 times [2022-03-20 12:46:02,874 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:46:02,874 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [513549468] [2022-03-20 12:46:02,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:46:02,874 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:46:02,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:46:03,032 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:46:03,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:46:03,036 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2022-03-20 12:46:03,036 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:46:03,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [513549468] [2022-03-20 12:46:03,036 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [513549468] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:46:03,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1990351283] [2022-03-20 12:46:03,037 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:46:03,037 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:46:03,037 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:46:03,038 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:46:03,039 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-20 12:46:03,927 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2022-03-20 12:46:03,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:46:03,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 21 conjunts are in the unsatisfiable core [2022-03-20 12:46:03,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:46:04,070 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2022-03-20 12:46:04,070 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:46:04,342 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2022-03-20 12:46:04,342 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1990351283] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:46:04,342 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:46:04,342 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 24 [2022-03-20 12:46:04,343 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:46:04,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [389222909] [2022-03-20 12:46:04,343 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [389222909] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:46:04,343 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:46:04,343 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 12:46:04,343 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203502886] [2022-03-20 12:46:04,343 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:46:04,343 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 12:46:04,343 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:46:04,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 12:46:04,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=387, Unknown=0, NotChecked=0, Total=552 [2022-03-20 12:46:04,344 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 12 states have internal predecessors, (28), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:04,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:46:04,564 INFO L93 Difference]: Finished difference Result 95 states and 98 transitions. [2022-03-20 12:46:04,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 12:46:04,564 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 12 states have internal predecessors, (28), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2022-03-20 12:46:04,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:46:04,565 INFO L225 Difference]: With dead ends: 95 [2022-03-20 12:46:04,565 INFO L226 Difference]: Without dead ends: 64 [2022-03-20 12:46:04,566 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 100 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=180, Invalid=420, Unknown=0, NotChecked=0, Total=600 [2022-03-20 12:46:04,566 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 42 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 409 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 437 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 409 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 12:46:04,566 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 113 Invalid, 437 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 409 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 12:46:04,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-03-20 12:46:04,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2022-03-20 12:46:04,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 57 states have internal predecessors, (59), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:04,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2022-03-20 12:46:04,573 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 55 [2022-03-20 12:46:04,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:46:04,573 INFO L478 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2022-03-20 12:46:04,573 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 12 states have internal predecessors, (28), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:04,573 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2022-03-20 12:46:04,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-03-20 12:46:04,574 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:46:04,574 INFO L499 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:46:04,583 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-20 12:46:04,775 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:46:04,775 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:46:04,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:46:04,775 INFO L85 PathProgramCache]: Analyzing trace with hash -1999539772, now seen corresponding path program 19 times [2022-03-20 12:46:04,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:46:04,775 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1045107633] [2022-03-20 12:46:04,777 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:46:04,777 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:46:04,777 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:46:04,777 INFO L85 PathProgramCache]: Analyzing trace with hash -1999539772, now seen corresponding path program 20 times [2022-03-20 12:46:04,777 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:46:04,777 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [934069253] [2022-03-20 12:46:04,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:46:04,777 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:46:04,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:46:04,983 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:46:04,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:46:04,989 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2022-03-20 12:46:04,989 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:46:04,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [934069253] [2022-03-20 12:46:04,989 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [934069253] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:46:04,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [434613603] [2022-03-20 12:46:04,990 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:46:04,990 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:46:04,990 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:46:04,991 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:46:05,000 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-20 12:46:05,099 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:46:05,100 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:46:05,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 23 conjunts are in the unsatisfiable core [2022-03-20 12:46:05,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:46:05,259 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2022-03-20 12:46:05,259 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:46:05,581 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2022-03-20 12:46:05,582 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [434613603] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:46:05,582 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:46:05,582 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 26 [2022-03-20 12:46:05,582 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:46:05,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1045107633] [2022-03-20 12:46:05,582 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1045107633] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:46:05,583 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:46:05,583 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 12:46:05,583 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262801056] [2022-03-20 12:46:05,583 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:46:05,583 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 12:46:05,583 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:46:05,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 12:46:05,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=458, Unknown=0, NotChecked=0, Total=650 [2022-03-20 12:46:05,584 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:05,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:46:05,839 INFO L93 Difference]: Finished difference Result 103 states and 106 transitions. [2022-03-20 12:46:05,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 12:46:05,839 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 60 [2022-03-20 12:46:05,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:46:05,840 INFO L225 Difference]: With dead ends: 103 [2022-03-20 12:46:05,840 INFO L226 Difference]: Without dead ends: 69 [2022-03-20 12:46:05,841 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 109 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=208, Invalid=494, Unknown=0, NotChecked=0, Total=702 [2022-03-20 12:46:05,841 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 53 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 483 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 517 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 483 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 12:46:05,841 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 117 Invalid, 517 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 483 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 12:46:05,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-03-20 12:46:05,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2022-03-20 12:46:05,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 62 states have (on average 1.032258064516129) internal successors, (64), 62 states have internal predecessors, (64), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:05,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2022-03-20 12:46:05,847 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 60 [2022-03-20 12:46:05,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:46:05,848 INFO L478 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2022-03-20 12:46:05,848 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:05,848 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2022-03-20 12:46:05,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-03-20 12:46:05,849 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:46:05,849 INFO L499 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:46:05,870 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-20 12:46:06,055 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-03-20 12:46:06,055 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:46:06,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:46:06,056 INFO L85 PathProgramCache]: Analyzing trace with hash -1686779215, now seen corresponding path program 21 times [2022-03-20 12:46:06,056 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:46:06,056 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [482259206] [2022-03-20 12:46:06,057 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:46:06,057 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:46:06,057 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:46:06,057 INFO L85 PathProgramCache]: Analyzing trace with hash -1686779215, now seen corresponding path program 22 times [2022-03-20 12:46:06,058 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:46:06,058 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [716743278] [2022-03-20 12:46:06,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:46:06,058 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:46:06,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:46:06,276 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:46:06,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:46:06,283 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2022-03-20 12:46:06,283 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:46:06,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [716743278] [2022-03-20 12:46:06,284 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [716743278] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:46:06,284 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [174643674] [2022-03-20 12:46:06,284 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:46:06,284 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:46:06,284 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:46:06,285 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:46:06,313 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-20 12:46:06,503 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:46:06,503 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:46:06,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 25 conjunts are in the unsatisfiable core [2022-03-20 12:46:06,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:46:06,712 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 0 proven. 176 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2022-03-20 12:46:06,712 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:46:07,077 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 0 proven. 176 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2022-03-20 12:46:07,078 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [174643674] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:46:07,078 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:46:07,078 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 28 [2022-03-20 12:46:07,078 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:46:07,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [482259206] [2022-03-20 12:46:07,079 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [482259206] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:46:07,079 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:46:07,079 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 12:46:07,079 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328149159] [2022-03-20 12:46:07,079 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:46:07,079 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 12:46:07,079 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:46:07,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 12:46:07,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=535, Unknown=0, NotChecked=0, Total=756 [2022-03-20 12:46:07,080 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 14 states have internal predecessors, (32), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:07,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:46:07,368 INFO L93 Difference]: Finished difference Result 111 states and 114 transitions. [2022-03-20 12:46:07,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 12:46:07,368 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 14 states have internal predecessors, (32), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2022-03-20 12:46:07,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:46:07,369 INFO L225 Difference]: With dead ends: 111 [2022-03-20 12:46:07,369 INFO L226 Difference]: Without dead ends: 74 [2022-03-20 12:46:07,370 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 118 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=238, Invalid=574, Unknown=0, NotChecked=0, Total=812 [2022-03-20 12:46:07,370 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 52 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 583 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 617 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 583 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 12:46:07,371 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 153 Invalid, 617 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 583 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 12:46:07,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-03-20 12:46:07,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 71. [2022-03-20 12:46:07,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 67 states have internal predecessors, (69), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:07,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2022-03-20 12:46:07,377 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 65 [2022-03-20 12:46:07,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:46:07,377 INFO L478 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2022-03-20 12:46:07,377 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 14 states have internal predecessors, (32), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:07,377 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2022-03-20 12:46:07,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-03-20 12:46:07,378 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:46:07,378 INFO L499 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:46:07,405 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-03-20 12:46:07,599 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-03-20 12:46:07,599 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:46:07,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:46:07,600 INFO L85 PathProgramCache]: Analyzing trace with hash -595686744, now seen corresponding path program 23 times [2022-03-20 12:46:07,600 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:46:07,600 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2073707051] [2022-03-20 12:46:07,601 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:46:07,601 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:46:07,602 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:46:07,602 INFO L85 PathProgramCache]: Analyzing trace with hash -595686744, now seen corresponding path program 24 times [2022-03-20 12:46:07,602 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:46:07,602 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1906279431] [2022-03-20 12:46:07,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:46:07,602 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:46:07,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:46:07,856 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:46:07,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:46:07,860 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-03-20 12:46:07,861 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:46:07,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1906279431] [2022-03-20 12:46:07,861 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1906279431] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:46:07,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [309017156] [2022-03-20 12:46:07,861 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:46:07,861 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:46:07,862 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:46:07,863 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:46:07,892 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-20 12:46:15,868 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2022-03-20 12:46:15,869 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:46:15,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-20 12:46:15,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:46:16,097 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2022-03-20 12:46:16,097 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:46:17,086 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2022-03-20 12:46:17,086 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [309017156] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:46:17,086 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:46:17,086 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 16] total 31 [2022-03-20 12:46:17,087 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:46:17,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2073707051] [2022-03-20 12:46:17,087 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2073707051] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:46:17,087 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:46:17,087 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 12:46:17,087 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409700579] [2022-03-20 12:46:17,087 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:46:17,088 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 12:46:17,088 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:46:17,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 12:46:17,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=661, Unknown=0, NotChecked=0, Total=930 [2022-03-20 12:46:17,089 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:17,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:46:17,422 INFO L93 Difference]: Finished difference Result 119 states and 122 transitions. [2022-03-20 12:46:17,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-20 12:46:17,423 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 70 [2022-03-20 12:46:17,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:46:17,424 INFO L225 Difference]: With dead ends: 119 [2022-03-20 12:46:17,424 INFO L226 Difference]: Without dead ends: 79 [2022-03-20 12:46:17,424 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 126 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=288, Invalid=704, Unknown=0, NotChecked=0, Total=992 [2022-03-20 12:46:17,425 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 47 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 697 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 729 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 697 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 12:46:17,425 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 201 Invalid, 729 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 697 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 12:46:17,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-03-20 12:46:17,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2022-03-20 12:46:17,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 72 states have (on average 1.0277777777777777) internal successors, (74), 72 states have internal predecessors, (74), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:17,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 77 transitions. [2022-03-20 12:46:17,430 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 77 transitions. Word has length 70 [2022-03-20 12:46:17,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:46:17,430 INFO L478 AbstractCegarLoop]: Abstraction has 76 states and 77 transitions. [2022-03-20 12:46:17,430 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:17,430 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 77 transitions. [2022-03-20 12:46:17,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-03-20 12:46:17,431 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:46:17,431 INFO L499 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:46:17,443 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-03-20 12:46:17,639 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-03-20 12:46:17,640 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:46:17,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:46:17,640 INFO L85 PathProgramCache]: Analyzing trace with hash -1264174643, now seen corresponding path program 25 times [2022-03-20 12:46:17,640 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:46:17,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [429009247] [2022-03-20 12:46:17,641 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:46:17,641 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:46:17,641 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:46:17,642 INFO L85 PathProgramCache]: Analyzing trace with hash -1264174643, now seen corresponding path program 26 times [2022-03-20 12:46:17,642 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:46:17,642 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1046912387] [2022-03-20 12:46:17,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:46:17,642 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:46:17,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:46:17,876 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:46:17,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:46:17,880 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2022-03-20 12:46:17,880 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:46:17,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1046912387] [2022-03-20 12:46:17,880 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1046912387] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:46:17,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [995975307] [2022-03-20 12:46:17,881 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:46:17,881 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:46:17,881 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:46:17,884 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:46:17,908 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-20 12:46:18,169 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:46:18,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:46:18,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-20 12:46:18,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:46:18,358 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 0 proven. 247 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2022-03-20 12:46:18,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:46:18,774 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 0 proven. 247 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2022-03-20 12:46:18,774 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [995975307] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:46:18,774 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:46:18,774 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 32 [2022-03-20 12:46:18,776 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:46:18,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [429009247] [2022-03-20 12:46:18,776 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [429009247] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:46:18,776 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:46:18,776 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-20 12:46:18,776 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115863338] [2022-03-20 12:46:18,776 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:46:18,777 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-20 12:46:18,777 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:46:18,777 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-20 12:46:18,777 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=285, Invalid=707, Unknown=0, NotChecked=0, Total=992 [2022-03-20 12:46:18,778 INFO L87 Difference]: Start difference. First operand 76 states and 77 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 16 states have internal predecessors, (36), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:19,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:46:19,125 INFO L93 Difference]: Finished difference Result 127 states and 130 transitions. [2022-03-20 12:46:19,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 12:46:19,125 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 16 states have internal predecessors, (36), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 75 [2022-03-20 12:46:19,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:46:19,126 INFO L225 Difference]: With dead ends: 127 [2022-03-20 12:46:19,126 INFO L226 Difference]: Without dead ends: 84 [2022-03-20 12:46:19,126 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 136 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=304, Invalid=752, Unknown=0, NotChecked=0, Total=1056 [2022-03-20 12:46:19,127 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 56 mSDsluCounter, 194 mSDsCounter, 0 mSdLazyCounter, 798 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 216 SdHoareTripleChecker+Invalid, 835 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 798 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 12:46:19,127 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 216 Invalid, 835 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 798 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 12:46:19,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-03-20 12:46:19,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 81. [2022-03-20 12:46:19,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 77 states have (on average 1.025974025974026) internal successors, (79), 77 states have internal predecessors, (79), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:19,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 82 transitions. [2022-03-20 12:46:19,133 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 82 transitions. Word has length 75 [2022-03-20 12:46:19,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:46:19,133 INFO L478 AbstractCegarLoop]: Abstraction has 81 states and 82 transitions. [2022-03-20 12:46:19,133 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 16 states have internal predecessors, (36), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:19,133 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 82 transitions. [2022-03-20 12:46:19,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-03-20 12:46:19,134 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:46:19,134 INFO L499 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:46:19,153 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-20 12:46:19,339 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-03-20 12:46:19,339 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:46:19,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:46:19,340 INFO L85 PathProgramCache]: Analyzing trace with hash 407708556, now seen corresponding path program 27 times [2022-03-20 12:46:19,340 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:46:19,340 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [902710027] [2022-03-20 12:46:19,342 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:46:19,342 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:46:19,342 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:46:19,342 INFO L85 PathProgramCache]: Analyzing trace with hash 407708556, now seen corresponding path program 28 times [2022-03-20 12:46:19,342 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:46:19,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1889549719] [2022-03-20 12:46:19,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:46:19,342 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:46:19,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:46:19,583 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:46:19,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:46:19,588 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2022-03-20 12:46:19,588 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:46:19,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1889549719] [2022-03-20 12:46:19,589 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1889549719] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:46:19,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1395308926] [2022-03-20 12:46:19,589 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:46:19,589 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:46:19,589 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:46:19,592 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:46:19,597 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-20 12:46:19,817 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:46:19,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:46:19,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-20 12:46:19,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:46:19,993 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2022-03-20 12:46:19,994 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:46:20,475 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2022-03-20 12:46:20,475 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1395308926] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:46:20,475 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:46:20,475 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 34 [2022-03-20 12:46:20,475 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:46:20,475 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [902710027] [2022-03-20 12:46:20,475 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [902710027] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:46:20,475 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:46:20,476 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-20 12:46:20,476 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [530380347] [2022-03-20 12:46:20,476 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:46:20,476 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-20 12:46:20,476 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:46:20,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-20 12:46:20,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=320, Invalid=802, Unknown=0, NotChecked=0, Total=1122 [2022-03-20 12:46:20,477 INFO L87 Difference]: Start difference. First operand 81 states and 82 transitions. Second operand has 18 states, 18 states have (on average 2.111111111111111) internal successors, (38), 17 states have internal predecessors, (38), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:20,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:46:20,812 INFO L93 Difference]: Finished difference Result 135 states and 138 transitions. [2022-03-20 12:46:20,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-20 12:46:20,812 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.111111111111111) internal successors, (38), 17 states have internal predecessors, (38), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 80 [2022-03-20 12:46:20,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:46:20,813 INFO L225 Difference]: With dead ends: 135 [2022-03-20 12:46:20,813 INFO L226 Difference]: Without dead ends: 89 [2022-03-20 12:46:20,814 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 145 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=340, Invalid=850, Unknown=0, NotChecked=0, Total=1190 [2022-03-20 12:46:20,819 INFO L913 BasicCegarLoop]: 23 mSDtfsCounter, 57 mSDsluCounter, 230 mSDsCounter, 0 mSdLazyCounter, 919 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 253 SdHoareTripleChecker+Invalid, 957 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 919 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 12:46:20,820 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 253 Invalid, 957 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 919 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 12:46:20,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-03-20 12:46:20,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2022-03-20 12:46:20,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 82 states have (on average 1.024390243902439) internal successors, (84), 82 states have internal predecessors, (84), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:20,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 87 transitions. [2022-03-20 12:46:20,832 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 87 transitions. Word has length 80 [2022-03-20 12:46:20,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:46:20,832 INFO L478 AbstractCegarLoop]: Abstraction has 86 states and 87 transitions. [2022-03-20 12:46:20,832 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.111111111111111) internal successors, (38), 17 states have internal predecessors, (38), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:20,832 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 87 transitions. [2022-03-20 12:46:20,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-03-20 12:46:20,833 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:46:20,833 INFO L499 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:46:20,851 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-03-20 12:46:21,035 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:46:21,035 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:46:21,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:46:21,036 INFO L85 PathProgramCache]: Analyzing trace with hash -1855190807, now seen corresponding path program 29 times [2022-03-20 12:46:21,036 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:46:21,036 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [13718266] [2022-03-20 12:46:21,037 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:46:21,037 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:46:21,037 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:46:21,037 INFO L85 PathProgramCache]: Analyzing trace with hash -1855190807, now seen corresponding path program 30 times [2022-03-20 12:46:21,037 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:46:21,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2091514801] [2022-03-20 12:46:21,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:46:21,038 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:46:21,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:46:21,324 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:46:21,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:46:21,328 INFO L134 CoverageAnalysis]: Checked inductivity of 555 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2022-03-20 12:46:21,328 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:46:21,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2091514801] [2022-03-20 12:46:21,328 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2091514801] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:46:21,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [228297052] [2022-03-20 12:46:21,329 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:46:21,329 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:46:21,329 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:46:21,332 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:46:21,333 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-20 12:46:48,343 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 16 check-sat command(s) [2022-03-20 12:46:48,343 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:46:48,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 306 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-20 12:46:48,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:46:48,572 INFO L134 CoverageAnalysis]: Checked inductivity of 555 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2022-03-20 12:46:48,572 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:46:49,094 INFO L134 CoverageAnalysis]: Checked inductivity of 555 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2022-03-20 12:46:49,094 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [228297052] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:46:49,094 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:46:49,094 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 36 [2022-03-20 12:46:49,095 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:46:49,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [13718266] [2022-03-20 12:46:49,095 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [13718266] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:46:49,095 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:46:49,095 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-20 12:46:49,095 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511150154] [2022-03-20 12:46:49,095 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:46:49,095 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-20 12:46:49,095 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:46:49,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-20 12:46:49,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=903, Unknown=0, NotChecked=0, Total=1260 [2022-03-20 12:46:49,096 INFO L87 Difference]: Start difference. First operand 86 states and 87 transitions. Second operand has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:49,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:46:49,522 INFO L93 Difference]: Finished difference Result 143 states and 146 transitions. [2022-03-20 12:46:49,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-20 12:46:49,522 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 85 [2022-03-20 12:46:49,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:46:49,523 INFO L225 Difference]: With dead ends: 143 [2022-03-20 12:46:49,523 INFO L226 Difference]: Without dead ends: 94 [2022-03-20 12:46:49,524 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 154 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=378, Invalid=954, Unknown=0, NotChecked=0, Total=1332 [2022-03-20 12:46:49,524 INFO L913 BasicCegarLoop]: 24 mSDtfsCounter, 58 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 1048 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 292 SdHoareTripleChecker+Invalid, 1087 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 1048 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-20 12:46:49,524 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 292 Invalid, 1087 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 1048 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-20 12:46:49,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-03-20 12:46:49,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 91. [2022-03-20 12:46:49,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 87 states have (on average 1.0229885057471264) internal successors, (89), 87 states have internal predecessors, (89), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:49,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2022-03-20 12:46:49,530 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 85 [2022-03-20 12:46:49,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:46:49,530 INFO L478 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2022-03-20 12:46:49,530 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:49,530 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2022-03-20 12:46:49,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2022-03-20 12:46:49,531 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:46:49,531 INFO L499 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:46:49,549 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-20 12:46:49,743 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-03-20 12:46:49,744 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:46:49,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:46:49,744 INFO L85 PathProgramCache]: Analyzing trace with hash 741309552, now seen corresponding path program 31 times [2022-03-20 12:46:49,744 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:46:49,744 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [658550200] [2022-03-20 12:46:49,745 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:46:49,745 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:46:49,745 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:46:49,746 INFO L85 PathProgramCache]: Analyzing trace with hash 741309552, now seen corresponding path program 32 times [2022-03-20 12:46:49,746 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:46:49,746 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [388541427] [2022-03-20 12:46:49,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:46:49,746 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:46:49,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:46:50,066 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:46:50,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:46:50,071 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2022-03-20 12:46:50,071 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:46:50,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [388541427] [2022-03-20 12:46:50,072 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [388541427] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:46:50,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1426458403] [2022-03-20 12:46:50,072 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:46:50,072 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:46:50,072 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:46:50,074 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:46:50,075 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-20 12:46:50,958 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:46:50,959 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:46:50,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-20 12:46:50,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:46:51,191 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 0 proven. 376 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2022-03-20 12:46:51,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:46:51,723 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 0 proven. 376 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2022-03-20 12:46:51,724 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1426458403] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:46:51,724 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:46:51,724 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 38 [2022-03-20 12:46:51,724 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:46:51,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [658550200] [2022-03-20 12:46:51,724 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [658550200] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:46:51,724 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:46:51,724 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-20 12:46:51,724 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1968047050] [2022-03-20 12:46:51,724 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:46:51,725 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-20 12:46:51,725 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:46:51,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-20 12:46:51,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=396, Invalid=1010, Unknown=0, NotChecked=0, Total=1406 [2022-03-20 12:46:51,726 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand has 20 states, 20 states have (on average 2.1) internal successors, (42), 19 states have internal predecessors, (42), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:52,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:46:52,221 INFO L93 Difference]: Finished difference Result 151 states and 154 transitions. [2022-03-20 12:46:52,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-03-20 12:46:52,221 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.1) internal successors, (42), 19 states have internal predecessors, (42), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 90 [2022-03-20 12:46:52,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:46:52,222 INFO L225 Difference]: With dead ends: 151 [2022-03-20 12:46:52,223 INFO L226 Difference]: Without dead ends: 99 [2022-03-20 12:46:52,223 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 163 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=418, Invalid=1064, Unknown=0, NotChecked=0, Total=1482 [2022-03-20 12:46:52,224 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 65 mSDsluCounter, 293 mSDsCounter, 0 mSdLazyCounter, 1176 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 318 SdHoareTripleChecker+Invalid, 1219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 1176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 12:46:52,224 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 318 Invalid, 1219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 1176 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 12:46:52,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-03-20 12:46:52,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 96. [2022-03-20 12:46:52,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 92 states have (on average 1.0217391304347827) internal successors, (94), 92 states have internal predecessors, (94), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:52,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 97 transitions. [2022-03-20 12:46:52,229 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 97 transitions. Word has length 90 [2022-03-20 12:46:52,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:46:52,230 INFO L478 AbstractCegarLoop]: Abstraction has 96 states and 97 transitions. [2022-03-20 12:46:52,230 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.1) internal successors, (42), 19 states have internal predecessors, (42), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:52,230 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 97 transitions. [2022-03-20 12:46:52,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-03-20 12:46:52,230 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:46:52,230 INFO L499 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:46:52,259 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-20 12:46:52,448 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-20 12:46:52,449 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:46:52,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:46:52,449 INFO L85 PathProgramCache]: Analyzing trace with hash 1721038853, now seen corresponding path program 33 times [2022-03-20 12:46:52,449 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:46:52,449 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2130959247] [2022-03-20 12:46:52,451 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:46:52,451 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:46:52,451 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:46:52,451 INFO L85 PathProgramCache]: Analyzing trace with hash 1721038853, now seen corresponding path program 34 times [2022-03-20 12:46:52,451 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:46:52,451 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [769242070] [2022-03-20 12:46:52,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:46:52,451 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:46:52,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:46:52,747 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:46:52,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:46:52,755 INFO L134 CoverageAnalysis]: Checked inductivity of 714 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2022-03-20 12:46:52,755 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:46:52,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [769242070] [2022-03-20 12:46:52,755 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [769242070] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:46:52,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [873721076] [2022-03-20 12:46:52,755 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:46:52,756 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:46:52,756 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:46:52,758 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:46:52,759 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-20 12:46:53,372 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:46:53,373 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:46:53,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 336 conjuncts, 37 conjunts are in the unsatisfiable core [2022-03-20 12:46:53,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:46:53,582 INFO L134 CoverageAnalysis]: Checked inductivity of 714 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2022-03-20 12:46:53,582 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:46:54,200 INFO L134 CoverageAnalysis]: Checked inductivity of 714 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2022-03-20 12:46:54,201 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [873721076] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:46:54,201 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:46:54,201 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 40 [2022-03-20 12:46:54,201 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:46:54,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2130959247] [2022-03-20 12:46:54,201 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2130959247] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:46:54,202 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:46:54,202 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-20 12:46:54,202 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160254713] [2022-03-20 12:46:54,202 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:46:54,202 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-20 12:46:54,202 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:46:54,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-20 12:46:54,203 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=1123, Unknown=0, NotChecked=0, Total=1560 [2022-03-20 12:46:54,203 INFO L87 Difference]: Start difference. First operand 96 states and 97 transitions. Second operand has 21 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 20 states have internal predecessors, (44), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:54,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:46:54,725 INFO L93 Difference]: Finished difference Result 159 states and 162 transitions. [2022-03-20 12:46:54,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-20 12:46:54,725 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 20 states have internal predecessors, (44), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 95 [2022-03-20 12:46:54,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:46:54,726 INFO L225 Difference]: With dead ends: 159 [2022-03-20 12:46:54,726 INFO L226 Difference]: Without dead ends: 104 [2022-03-20 12:46:54,726 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 172 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2022-03-20 12:46:54,727 INFO L913 BasicCegarLoop]: 26 mSDtfsCounter, 72 mSDsluCounter, 320 mSDsCounter, 0 mSdLazyCounter, 1312 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 346 SdHoareTripleChecker+Invalid, 1359 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 1312 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 12:46:54,727 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 346 Invalid, 1359 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 1312 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 12:46:54,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2022-03-20 12:46:54,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 101. [2022-03-20 12:46:54,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 97 states have (on average 1.0206185567010309) internal successors, (99), 97 states have internal predecessors, (99), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:54,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 102 transitions. [2022-03-20 12:46:54,733 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 102 transitions. Word has length 95 [2022-03-20 12:46:54,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:46:54,733 INFO L478 AbstractCegarLoop]: Abstraction has 101 states and 102 transitions. [2022-03-20 12:46:54,733 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 20 states have internal predecessors, (44), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:46:54,733 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 102 transitions. [2022-03-20 12:46:54,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2022-03-20 12:46:54,734 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:46:54,734 INFO L499 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:46:54,755 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-03-20 12:46:54,943 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:46:54,944 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:46:54,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:46:54,944 INFO L85 PathProgramCache]: Analyzing trace with hash 1469568340, now seen corresponding path program 35 times [2022-03-20 12:46:54,944 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:46:54,944 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1878024366] [2022-03-20 12:46:54,945 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:46:54,945 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:46:54,945 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:46:54,945 INFO L85 PathProgramCache]: Analyzing trace with hash 1469568340, now seen corresponding path program 36 times [2022-03-20 12:46:54,945 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:46:54,946 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1883164477] [2022-03-20 12:46:54,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:46:54,946 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:46:54,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:46:55,264 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:46:55,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:46:55,270 INFO L134 CoverageAnalysis]: Checked inductivity of 801 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 477 trivial. 0 not checked. [2022-03-20 12:46:55,270 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:46:55,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1883164477] [2022-03-20 12:46:55,271 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1883164477] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:46:55,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2109472768] [2022-03-20 12:46:55,271 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:46:55,271 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:46:55,271 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:46:55,276 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:46:55,284 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process