/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/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/loopacceleration/qvasr/qvasr_64.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_3-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-7968f31 [2022-03-17 19:34:13,195 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-17 19:34:13,204 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-17 19:34:13,245 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-03-17 19:34:13,245 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-03-17 19:34:13,246 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-03-17 19:34:13,249 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-03-17 19:34:13,258 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-03-17 19:34:13,260 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-03-17 19:34:13,265 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-03-17 19:34:13,265 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-03-17 19:34:13,266 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-03-17 19:34:13,266 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-03-17 19:34:13,267 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-03-17 19:34:13,267 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-03-17 19:34:13,268 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-03-17 19:34:13,268 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-03-17 19:34:13,269 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-03-17 19:34:13,270 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-03-17 19:34:13,271 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-03-17 19:34:13,271 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-03-17 19:34:13,274 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-03-17 19:34:13,276 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-03-17 19:34:13,278 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-03-17 19:34:13,279 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-03-17 19:34:13,284 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2022-03-17 19:34:13,290 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-17 19:34:13,291 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-17 19:34:13,293 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-17 19:34:13,294 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/loopacceleration/qvasr/qvasr_64.epf [2022-03-17 19:34:13,319 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-17 19:34:13,319 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-17 19:34:13,321 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-03-17 19:34:13,321 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-03-17 19:34:13,322 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-03-17 19:34:13,322 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-03-17 19:34:13,322 INFO L138 SettingsManager]: * Use SBE=true [2022-03-17 19:34:13,322 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-17 19:34:13,322 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-17 19:34:13,323 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-17 19:34:13,323 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-17 19:34:13,323 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-17 19:34:13,323 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-17 19:34:13,323 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-17 19:34:13,323 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-17 19:34:13,323 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-17 19:34:13,323 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-17 19:34:13,323 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-17 19:34:13,324 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-17 19:34:13,324 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-17 19:34:13,324 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-17 19:34:13,324 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-03-17 19:34:13,324 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-03-17 19:34:13,324 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-03-17 19:34:13,324 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-03-17 19:34:13,324 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-17 19:34:13,325 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-03-17 19:34:13,325 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-03-17 19:34:13,325 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2022-03-17 19:34:13,326 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_QVASR 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-17 19:34:13,494 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-17 19:34:13,513 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-17 19:34:13,515 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-17 19:34:13,515 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-17 19:34:13,516 INFO L275 PluginConnector]: CDTParser initialized [2022-03-17 19:34:13,517 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_3-2.i [2022-03-17 19:34:13,562 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8019d271d/e8b5c84a039e49a3a2184c7e913e2db2/FLAG0a86fb644 [2022-03-17 19:34:13,932 INFO L306 CDTParser]: Found 1 translation units. [2022-03-17 19:34:13,933 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_3-2.i [2022-03-17 19:34:13,943 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8019d271d/e8b5c84a039e49a3a2184c7e913e2db2/FLAG0a86fb644 [2022-03-17 19:34:13,952 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8019d271d/e8b5c84a039e49a3a2184c7e913e2db2 [2022-03-17 19:34:13,954 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-17 19:34:13,955 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2022-03-17 19:34:13,955 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-17 19:34:13,956 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-17 19:34:13,969 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-17 19:34:13,969 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.03 07:34:13" (1/1) ... [2022-03-17 19:34:13,970 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@42445ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 07:34:13, skipping insertion in model container [2022-03-17 19:34:13,970 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.03 07:34:13" (1/1) ... [2022-03-17 19:34:13,975 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-17 19:34:13,989 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-17 19:34:14,142 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_3-2.i[809,822] [2022-03-17 19:34:14,155 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-17 19:34:14,161 INFO L203 MainTranslator]: Completed pre-run [2022-03-17 19:34:14,170 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_3-2.i[809,822] [2022-03-17 19:34:14,177 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-17 19:34:14,189 INFO L208 MainTranslator]: Completed translation [2022-03-17 19:34:14,189 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 07:34:14 WrapperNode [2022-03-17 19:34:14,190 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-17 19:34:14,192 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-17 19:34:14,192 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-17 19:34:14,192 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-17 19:34:14,200 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 07:34:14" (1/1) ... [2022-03-17 19:34:14,200 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 07:34:14" (1/1) ... [2022-03-17 19:34:14,205 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 07:34:14" (1/1) ... [2022-03-17 19:34:14,205 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 07:34:14" (1/1) ... [2022-03-17 19:34:14,218 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 07:34:14" (1/1) ... [2022-03-17 19:34:14,221 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 07:34:14" (1/1) ... [2022-03-17 19:34:14,222 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 07:34:14" (1/1) ... [2022-03-17 19:34:14,228 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-17 19:34:14,229 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-17 19:34:14,229 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-17 19:34:14,229 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-17 19:34:14,230 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 07:34:14" (1/1) ... [2022-03-17 19:34:14,235 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-17 19:34:14,244 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 19:34:14,254 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) [2022-03-17 19:34:14,273 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 [2022-03-17 19:34:14,286 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-17 19:34:14,286 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-17 19:34:14,286 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-17 19:34:14,286 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-17 19:34:14,286 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-17 19:34:14,287 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-17 19:34:14,287 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-17 19:34:14,287 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2022-03-17 19:34:14,288 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2022-03-17 19:34:14,288 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-17 19:34:14,288 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-17 19:34:14,288 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-17 19:34:14,288 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-03-17 19:34:14,288 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-17 19:34:14,288 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-03-17 19:34:14,288 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-17 19:34:14,289 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-17 19:34:14,289 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-17 19:34:14,289 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-17 19:34:14,289 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-17 19:34:14,289 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-17 19:34:14,340 INFO L234 CfgBuilder]: Building ICFG [2022-03-17 19:34:14,342 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-17 19:34:14,469 INFO L275 CfgBuilder]: Performing block encoding [2022-03-17 19:34:14,499 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-17 19:34:14,500 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-03-17 19:34:14,501 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.03 07:34:14 BoogieIcfgContainer [2022-03-17 19:34:14,502 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-17 19:34:14,502 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2022-03-17 19:34:14,502 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2022-03-17 19:34:14,520 INFO L275 PluginConnector]: IcfgTransformer initialized [2022-03-17 19:34:14,522 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.03 07:34:14" (1/1) ... [2022-03-17 19:34:14,533 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 17.03 07:34:14 BasicIcfg [2022-03-17 19:34:14,533 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2022-03-17 19:34:14,535 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-17 19:34:14,535 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-17 19:34:14,547 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-17 19:34:14,548 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.03 07:34:13" (1/4) ... [2022-03-17 19:34:14,548 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@225c530b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.03 07:34:14, skipping insertion in model container [2022-03-17 19:34:14,548 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 07:34:14" (2/4) ... [2022-03-17 19:34:14,549 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@225c530b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.03 07:34:14, skipping insertion in model container [2022-03-17 19:34:14,549 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.03 07:34:14" (3/4) ... [2022-03-17 19:34:14,549 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@225c530b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 17.03 07:34:14, skipping insertion in model container [2022-03-17 19:34:14,549 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 17.03 07:34:14" (4/4) ... [2022-03-17 19:34:14,550 INFO L111 eAbstractionObserver]: Analyzing ICFG array_3-2.iqvasr [2022-03-17 19:34:14,553 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-03-17 19:34:14,554 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-17 19:34:14,598 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-17 19:34:14,605 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-17 19:34:14,605 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-17 19:34:14,624 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 17 states have (on average 1.411764705882353) internal successors, (24), 18 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-17 19:34:14,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-03-17 19:34:14,628 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 19:34:14,629 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 19:34:14,629 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 19:34:14,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 19:34:14,634 INFO L85 PathProgramCache]: Analyzing trace with hash -1043605578, now seen corresponding path program 1 times [2022-03-17 19:34:14,642 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 19:34:14,642 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1153948867] [2022-03-17 19:34:14,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 19:34:14,643 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 19:34:14,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:34:14,777 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 19:34:14,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:34:14,812 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 19:34:14,812 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 19:34:14,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1153948867] [2022-03-17 19:34:14,813 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1153948867] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-17 19:34:14,813 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-17 19:34:14,813 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-17 19:34:14,814 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158702213] [2022-03-17 19:34:14,815 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-17 19:34:14,818 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-17 19:34:14,818 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 19:34:14,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-17 19:34:14,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-17 19:34:14,842 INFO L87 Difference]: Start difference. First operand has 25 states, 17 states have (on average 1.411764705882353) internal successors, (24), 18 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:34:14,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 19:34:14,888 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2022-03-17 19:34:14,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-17 19:34:14,890 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2022-03-17 19:34:14,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 19:34:14,894 INFO L225 Difference]: With dead ends: 42 [2022-03-17 19:34:14,894 INFO L226 Difference]: Without dead ends: 18 [2022-03-17 19:34:14,897 INFO L911 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 [2022-03-17 19:34:14,901 INFO L912 BasicCegarLoop]: 26 mSDtfsCounter, 18 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-17 19:34:14,901 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 29 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-17 19:34:14,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-03-17 19:34:14,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-03-17 19:34:14,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:34:14,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2022-03-17 19:34:14,931 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2022-03-17 19:34:14,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 19:34:14,932 INFO L478 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2022-03-17 19:34:14,933 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:34:14,933 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2022-03-17 19:34:14,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-17 19:34:14,933 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 19:34:14,934 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 19:34:14,934 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-17 19:34:14,935 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 19:34:14,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 19:34:14,937 INFO L85 PathProgramCache]: Analyzing trace with hash -637810695, now seen corresponding path program 1 times [2022-03-17 19:34:14,937 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 19:34:14,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [473352559] [2022-03-17 19:34:14,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 19:34:14,938 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 19:34:14,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:34:15,001 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 19:34:15,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:34:15,013 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 19:34:15,014 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 19:34:15,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [473352559] [2022-03-17 19:34:15,014 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [473352559] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-17 19:34:15,015 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-17 19:34:15,015 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-17 19:34:15,015 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762845066] [2022-03-17 19:34:15,015 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-17 19:34:15,016 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-17 19:34:15,016 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 19:34:15,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-17 19:34:15,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-17 19:34:15,018 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:34:15,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 19:34:15,066 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2022-03-17 19:34:15,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-17 19:34:15,066 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-03-17 19:34:15,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 19:34:15,068 INFO L225 Difference]: With dead ends: 35 [2022-03-17 19:34:15,068 INFO L226 Difference]: Without dead ends: 25 [2022-03-17 19:34:15,072 INFO L911 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 [2022-03-17 19:34:15,073 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 26 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-17 19:34:15,073 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 22 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-17 19:34:15,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-03-17 19:34:15,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 19. [2022-03-17 19:34:15,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:34:15,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2022-03-17 19:34:15,090 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 15 [2022-03-17 19:34:15,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 19:34:15,090 INFO L478 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2022-03-17 19:34:15,090 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:34:15,091 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2022-03-17 19:34:15,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-17 19:34:15,091 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 19:34:15,091 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 19:34:15,091 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-17 19:34:15,091 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 19:34:15,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 19:34:15,095 INFO L85 PathProgramCache]: Analyzing trace with hash -693433385, now seen corresponding path program 1 times [2022-03-17 19:34:15,095 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 19:34:15,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1267691059] [2022-03-17 19:34:15,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 19:34:15,095 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 19:34:15,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:34:15,160 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 19:34:15,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:34:15,170 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 19:34:15,170 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 19:34:15,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1267691059] [2022-03-17 19:34:15,170 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1267691059] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-17 19:34:15,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1168329343] [2022-03-17 19:34:15,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 19:34:15,171 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 19:34:15,171 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 19:34:15,174 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) [2022-03-17 19:34:15,175 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-17 19:34:15,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:34:15,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 3 conjunts are in the unsatisfiable core [2022-03-17 19:34:15,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-17 19:34:15,287 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 19:34:15,287 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-17 19:34:15,346 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 19:34:15,346 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1168329343] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-17 19:34:15,347 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-17 19:34:15,347 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 8 [2022-03-17 19:34:15,347 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [692118484] [2022-03-17 19:34:15,347 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-17 19:34:15,347 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-17 19:34:15,347 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 19:34:15,348 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-17 19:34:15,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2022-03-17 19:34:15,348 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:34:15,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 19:34:15,482 INFO L93 Difference]: Finished difference Result 55 states and 69 transitions. [2022-03-17 19:34:15,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-17 19:34:15,483 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-03-17 19:34:15,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 19:34:15,484 INFO L225 Difference]: With dead ends: 55 [2022-03-17 19:34:15,484 INFO L226 Difference]: Without dead ends: 45 [2022-03-17 19:34:15,484 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2022-03-17 19:34:15,485 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 71 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-17 19:34:15,485 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 32 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-17 19:34:15,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-03-17 19:34:15,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 25. [2022-03-17 19:34:15,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:34:15,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2022-03-17 19:34:15,489 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2022-03-17 19:34:15,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 19:34:15,490 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2022-03-17 19:34:15,490 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:34:15,490 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2022-03-17 19:34:15,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-17 19:34:15,490 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 19:34:15,491 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 19:34:15,511 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-03-17 19:34:15,712 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 [2022-03-17 19:34:15,712 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 19:34:15,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 19:34:15,712 INFO L85 PathProgramCache]: Analyzing trace with hash -859874703, now seen corresponding path program 2 times [2022-03-17 19:34:15,713 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 19:34:15,713 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [843410732] [2022-03-17 19:34:15,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 19:34:15,713 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 19:34:15,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:34:15,788 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 19:34:15,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:34:15,799 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-17 19:34:15,799 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 19:34:15,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [843410732] [2022-03-17 19:34:15,799 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [843410732] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-17 19:34:15,799 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-17 19:34:15,800 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-17 19:34:15,800 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529952065] [2022-03-17 19:34:15,800 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-17 19:34:15,800 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-17 19:34:15,800 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 19:34:15,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-17 19:34:15,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-17 19:34:15,801 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:34:15,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 19:34:15,876 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2022-03-17 19:34:15,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-17 19:34:15,877 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-03-17 19:34:15,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 19:34:15,877 INFO L225 Difference]: With dead ends: 34 [2022-03-17 19:34:15,878 INFO L226 Difference]: Without dead ends: 29 [2022-03-17 19:34:15,878 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2022-03-17 19:34:15,879 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 25 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-17 19:34:15,879 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 31 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-17 19:34:15,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-17 19:34:15,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2022-03-17 19:34:15,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.173913043478261) internal successors, (27), 23 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:34:15,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2022-03-17 19:34:15,883 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 23 [2022-03-17 19:34:15,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 19:34:15,884 INFO L478 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2022-03-17 19:34:15,884 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:34:15,884 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2022-03-17 19:34:15,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-17 19:34:15,884 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 19:34:15,884 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 19:34:15,884 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-03-17 19:34:15,885 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 19:34:15,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 19:34:15,885 INFO L85 PathProgramCache]: Analyzing trace with hash 881682956, now seen corresponding path program 1 times [2022-03-17 19:34:15,885 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 19:34:15,885 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1399624348] [2022-03-17 19:34:15,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 19:34:15,885 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 19:34:15,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:34:15,938 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 19:34:15,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:34:15,949 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-17 19:34:15,950 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 19:34:15,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1399624348] [2022-03-17 19:34:15,951 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1399624348] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-17 19:34:15,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [281540870] [2022-03-17 19:34:15,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 19:34:15,951 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 19:34:15,951 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 19:34:15,952 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) [2022-03-17 19:34:15,953 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-17 19:34:16,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:34:16,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-17 19:34:16,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-17 19:34:16,103 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-17 19:34:16,103 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-17 19:34:16,223 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-17 19:34:16,223 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [281540870] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-17 19:34:16,223 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-17 19:34:16,223 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 16 [2022-03-17 19:34:16,223 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [830224091] [2022-03-17 19:34:16,223 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-17 19:34:16,224 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-17 19:34:16,224 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 19:34:16,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-17 19:34:16,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2022-03-17 19:34:16,226 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 16 states, 16 states have (on average 2.875) internal successors, (46), 14 states have internal predecessors, (46), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:34:16,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 19:34:16,528 INFO L93 Difference]: Finished difference Result 101 states and 130 transitions. [2022-03-17 19:34:16,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-17 19:34:16,529 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 14 states have internal predecessors, (46), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2022-03-17 19:34:16,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 19:34:16,529 INFO L225 Difference]: With dead ends: 101 [2022-03-17 19:34:16,529 INFO L226 Difference]: Without dead ends: 82 [2022-03-17 19:34:16,530 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=225, Invalid=531, Unknown=0, NotChecked=0, Total=756 [2022-03-17 19:34:16,530 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 180 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-17 19:34:16,531 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [180 Valid, 41 Invalid, 201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 139 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-17 19:34:16,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-03-17 19:34:16,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 56. [2022-03-17 19:34:16,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.1568627450980393) internal successors, (59), 51 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:34:16,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 63 transitions. [2022-03-17 19:34:16,544 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 63 transitions. Word has length 27 [2022-03-17 19:34:16,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 19:34:16,545 INFO L478 AbstractCegarLoop]: Abstraction has 56 states and 63 transitions. [2022-03-17 19:34:16,545 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 14 states have internal predecessors, (46), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:34:16,545 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 63 transitions. [2022-03-17 19:34:16,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-03-17 19:34:16,546 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 19:34:16,546 INFO L500 BasicCegarLoop]: trace histogram [10, 10, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 19:34:16,565 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-03-17 19:34:16,763 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 19:34:16,763 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 19:34:16,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 19:34:16,764 INFO L85 PathProgramCache]: Analyzing trace with hash 2068232748, now seen corresponding path program 2 times [2022-03-17 19:34:16,764 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 19:34:16,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1839136153] [2022-03-17 19:34:16,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 19:34:16,764 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 19:34:16,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:34:16,901 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 19:34:16,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:34:16,905 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-03-17 19:34:16,905 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 19:34:16,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1839136153] [2022-03-17 19:34:16,906 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1839136153] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-17 19:34:16,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [774968958] [2022-03-17 19:34:16,906 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-17 19:34:16,906 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 19:34:16,906 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 19:34:16,907 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) [2022-03-17 19:34:16,921 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-17 19:34:16,975 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-17 19:34:16,975 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-17 19:34:16,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-17 19:34:16,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-17 19:34:17,064 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-03-17 19:34:17,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-17 19:34:17,300 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-03-17 19:34:17,300 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [774968958] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-17 19:34:17,300 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-17 19:34:17,300 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 26 [2022-03-17 19:34:17,300 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1131783795] [2022-03-17 19:34:17,300 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-17 19:34:17,301 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-17 19:34:17,301 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 19:34:17,302 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-17 19:34:17,303 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2022-03-17 19:34:17,304 INFO L87 Difference]: Start difference. First operand 56 states and 63 transitions. Second operand has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:34:17,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 19:34:17,799 INFO L93 Difference]: Finished difference Result 195 states and 254 transitions. [2022-03-17 19:34:17,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-03-17 19:34:17,800 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2022-03-17 19:34:17,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 19:34:17,803 INFO L225 Difference]: With dead ends: 195 [2022-03-17 19:34:17,803 INFO L226 Difference]: Without dead ends: 166 [2022-03-17 19:34:17,804 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=853, Invalid=1403, Unknown=0, NotChecked=0, Total=2256 [2022-03-17 19:34:17,805 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 422 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 211 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 422 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 344 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 211 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-17 19:34:17,805 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [422 Valid, 42 Invalid, 344 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [133 Valid, 211 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-17 19:34:17,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2022-03-17 19:34:17,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 80. [2022-03-17 19:34:17,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 75 states have (on average 1.1066666666666667) internal successors, (83), 75 states have internal predecessors, (83), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:34:17,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 87 transitions. [2022-03-17 19:34:17,814 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 87 transitions. Word has length 55 [2022-03-17 19:34:17,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 19:34:17,814 INFO L478 AbstractCegarLoop]: Abstraction has 80 states and 87 transitions. [2022-03-17 19:34:17,814 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:34:17,814 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 87 transitions. [2022-03-17 19:34:17,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-03-17 19:34:17,815 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 19:34:17,815 INFO L500 BasicCegarLoop]: trace histogram [22, 22, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 19:34:17,851 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-17 19:34:18,031 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 19:34:18,032 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 19:34:18,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 19:34:18,033 INFO L85 PathProgramCache]: Analyzing trace with hash -838467180, now seen corresponding path program 3 times [2022-03-17 19:34:18,033 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 19:34:18,033 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2069274424] [2022-03-17 19:34:18,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 19:34:18,033 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 19:34:18,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:34:18,373 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 19:34:18,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:34:18,384 INFO L134 CoverageAnalysis]: Checked inductivity of 539 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-03-17 19:34:18,384 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 19:34:18,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2069274424] [2022-03-17 19:34:18,384 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2069274424] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-17 19:34:18,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [36117510] [2022-03-17 19:34:18,384 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-03-17 19:34:18,385 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 19:34:18,385 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 19:34:18,386 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) [2022-03-17 19:34:18,387 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-17 19:34:18,452 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-03-17 19:34:18,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-17 19:34:18,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-17 19:34:18,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-17 19:34:18,573 INFO L134 CoverageAnalysis]: Checked inductivity of 539 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2022-03-17 19:34:18,573 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-17 19:34:18,796 INFO L134 CoverageAnalysis]: Checked inductivity of 539 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2022-03-17 19:34:18,796 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [36117510] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-17 19:34:18,796 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-17 19:34:18,797 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 10, 10] total 35 [2022-03-17 19:34:18,797 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510771978] [2022-03-17 19:34:18,797 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-17 19:34:18,797 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-03-17 19:34:18,797 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 19:34:18,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-03-17 19:34:18,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2022-03-17 19:34:18,798 INFO L87 Difference]: Start difference. First operand 80 states and 87 transitions. Second operand has 35 states, 35 states have (on average 3.2) internal successors, (112), 33 states have internal predecessors, (112), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:34:19,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 19:34:19,558 INFO L93 Difference]: Finished difference Result 247 states and 315 transitions. [2022-03-17 19:34:19,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-03-17 19:34:19,559 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.2) internal successors, (112), 33 states have internal predecessors, (112), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 79 [2022-03-17 19:34:19,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 19:34:19,561 INFO L225 Difference]: With dead ends: 247 [2022-03-17 19:34:19,561 INFO L226 Difference]: Without dead ends: 192 [2022-03-17 19:34:19,565 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 179 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 661 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1441, Invalid=2849, Unknown=0, NotChecked=0, Total=4290 [2022-03-17 19:34:19,566 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 534 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 309 mSolverCounterSat, 198 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 534 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 507 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 198 IncrementalHoareTripleChecker+Valid, 309 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-17 19:34:19,566 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [534 Valid, 61 Invalid, 507 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [198 Valid, 309 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-17 19:34:19,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2022-03-17 19:34:19,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 190. [2022-03-17 19:34:19,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 185 states have (on average 1.172972972972973) internal successors, (217), 185 states have internal predecessors, (217), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:34:19,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 221 transitions. [2022-03-17 19:34:19,588 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 221 transitions. Word has length 79 [2022-03-17 19:34:19,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 19:34:19,588 INFO L478 AbstractCegarLoop]: Abstraction has 190 states and 221 transitions. [2022-03-17 19:34:19,588 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.2) internal successors, (112), 33 states have internal predecessors, (112), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:34:19,588 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 221 transitions. [2022-03-17 19:34:19,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2022-03-17 19:34:19,589 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 19:34:19,590 INFO L500 BasicCegarLoop]: trace histogram [30, 30, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 19:34:19,608 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-17 19:34:19,799 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 19:34:19,800 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 19:34:19,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 19:34:19,800 INFO L85 PathProgramCache]: Analyzing trace with hash -1983528018, now seen corresponding path program 4 times [2022-03-17 19:34:19,800 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 19:34:19,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634357254] [2022-03-17 19:34:19,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 19:34:19,800 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 19:34:19,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:34:20,231 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 19:34:20,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:34:20,237 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2022-03-17 19:34:20,238 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 19:34:20,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1634357254] [2022-03-17 19:34:20,238 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1634357254] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-17 19:34:20,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1298676723] [2022-03-17 19:34:20,238 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-17 19:34:20,238 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 19:34:20,238 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 19:34:20,240 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) [2022-03-17 19:34:20,241 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-17 19:34:20,354 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-17 19:34:20,354 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-17 19:34:20,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 564 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-17 19:34:20,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-17 19:34:20,663 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2022-03-17 19:34:20,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-17 19:34:21,781 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2022-03-17 19:34:21,781 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1298676723] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-17 19:34:21,781 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-17 19:34:21,781 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 64 [2022-03-17 19:34:21,781 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234652869] [2022-03-17 19:34:21,781 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-17 19:34:21,782 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-03-17 19:34:21,782 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 19:34:21,783 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-03-17 19:34:21,784 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1955, Invalid=2077, Unknown=0, NotChecked=0, Total=4032 [2022-03-17 19:34:21,784 INFO L87 Difference]: Start difference. First operand 190 states and 221 transitions. Second operand has 64 states, 64 states have (on average 2.109375) internal successors, (135), 63 states have internal predecessors, (135), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:34:23,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 19:34:23,836 INFO L93 Difference]: Finished difference Result 533 states and 687 transitions. [2022-03-17 19:34:23,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-03-17 19:34:23,841 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.109375) internal successors, (135), 63 states have internal predecessors, (135), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 189 [2022-03-17 19:34:23,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 19:34:23,842 INFO L225 Difference]: With dead ends: 533 [2022-03-17 19:34:23,842 INFO L226 Difference]: Without dead ends: 408 [2022-03-17 19:34:23,847 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 349 SyntacticMatches, 0 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2379 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=5736, Invalid=9516, Unknown=0, NotChecked=0, Total=15252 [2022-03-17 19:34:23,847 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 1173 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 502 mSolverCounterSat, 362 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1173 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 864 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 362 IncrementalHoareTripleChecker+Valid, 502 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-17 19:34:23,847 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1173 Valid, 52 Invalid, 864 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [362 Valid, 502 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-17 19:34:23,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2022-03-17 19:34:23,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 252. [2022-03-17 19:34:23,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 247 states have (on average 1.1295546558704452) internal successors, (279), 247 states have internal predecessors, (279), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:34:23,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 283 transitions. [2022-03-17 19:34:23,869 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 283 transitions. Word has length 189 [2022-03-17 19:34:23,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 19:34:23,869 INFO L478 AbstractCegarLoop]: Abstraction has 252 states and 283 transitions. [2022-03-17 19:34:23,869 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 2.109375) internal successors, (135), 63 states have internal predecessors, (135), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:34:23,869 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 283 transitions. [2022-03-17 19:34:23,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 252 [2022-03-17 19:34:23,871 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 19:34:23,871 INFO L500 BasicCegarLoop]: trace histogram [60, 60, 30, 30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 19:34:23,889 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-17 19:34:24,076 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 19:34:24,076 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 19:34:24,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 19:34:24,077 INFO L85 PathProgramCache]: Analyzing trace with hash -1726150512, now seen corresponding path program 5 times [2022-03-17 19:34:24,077 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 19:34:24,077 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [376248992] [2022-03-17 19:34:24,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 19:34:24,077 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 19:34:24,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:34:25,389 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 19:34:25,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:34:25,402 INFO L134 CoverageAnalysis]: Checked inductivity of 5311 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2022-03-17 19:34:25,402 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 19:34:25,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [376248992] [2022-03-17 19:34:25,402 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [376248992] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-17 19:34:25,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [304565207] [2022-03-17 19:34:25,402 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-03-17 19:34:25,403 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 19:34:25,403 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 19:34:25,404 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) [2022-03-17 19:34:25,423 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-17 19:36:08,524 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 61 check-sat command(s) [2022-03-17 19:36:08,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-17 19:36:08,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 843 conjuncts, 62 conjunts are in the unsatisfiable core [2022-03-17 19:36:08,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-17 19:36:08,995 INFO L134 CoverageAnalysis]: Checked inductivity of 5311 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2022-03-17 19:36:08,995 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-17 19:36:12,340 INFO L134 CoverageAnalysis]: Checked inductivity of 5311 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2022-03-17 19:36:12,340 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [304565207] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-17 19:36:12,340 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-17 19:36:12,340 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 63, 63] total 126 [2022-03-17 19:36:12,340 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240689293] [2022-03-17 19:36:12,341 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-17 19:36:12,341 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 126 states [2022-03-17 19:36:12,341 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 19:36:12,342 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 126 interpolants. [2022-03-17 19:36:12,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7752, Invalid=7998, Unknown=0, NotChecked=0, Total=15750 [2022-03-17 19:36:12,345 INFO L87 Difference]: Start difference. First operand 252 states and 283 transitions. Second operand has 126 states, 126 states have (on average 2.0555555555555554) internal successors, (259), 125 states have internal predecessors, (259), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:36:20,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 19:36:20,498 INFO L93 Difference]: Finished difference Result 967 states and 1276 transitions. [2022-03-17 19:36:20,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 125 states. [2022-03-17 19:36:20,498 INFO L78 Accepts]: Start accepts. Automaton has has 126 states, 126 states have (on average 2.0555555555555554) internal successors, (259), 125 states have internal predecessors, (259), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 251 [2022-03-17 19:36:20,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 19:36:20,501 INFO L225 Difference]: With dead ends: 967 [2022-03-17 19:36:20,501 INFO L226 Difference]: Without dead ends: 842 [2022-03-17 19:36:20,511 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 688 GetRequests, 442 SyntacticMatches, 0 SemanticMatches, 246 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9571 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=23003, Invalid=38253, Unknown=0, NotChecked=0, Total=61256 [2022-03-17 19:36:20,512 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 3045 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 980 mSolverCounterSat, 871 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3045 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 1851 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 871 IncrementalHoareTripleChecker+Valid, 980 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-03-17 19:36:20,512 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [3045 Valid, 42 Invalid, 1851 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [871 Valid, 980 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-03-17 19:36:20,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 842 states. [2022-03-17 19:36:20,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 842 to 376. [2022-03-17 19:36:20,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 376 states, 371 states have (on average 1.0862533692722371) internal successors, (403), 371 states have internal predecessors, (403), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:36:20,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 376 states to 376 states and 407 transitions. [2022-03-17 19:36:20,531 INFO L78 Accepts]: Start accepts. Automaton has 376 states and 407 transitions. Word has length 251 [2022-03-17 19:36:20,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 19:36:20,531 INFO L478 AbstractCegarLoop]: Abstraction has 376 states and 407 transitions. [2022-03-17 19:36:20,532 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 126 states, 126 states have (on average 2.0555555555555554) internal successors, (259), 125 states have internal predecessors, (259), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:36:20,532 INFO L276 IsEmpty]: Start isEmpty. Operand 376 states and 407 transitions. [2022-03-17 19:36:20,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 376 [2022-03-17 19:36:20,535 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 19:36:20,535 INFO L500 BasicCegarLoop]: trace histogram [122, 122, 30, 30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 19:36:20,594 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-17 19:36:20,739 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 19:36:20,739 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 19:36:20,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 19:36:20,740 INFO L85 PathProgramCache]: Analyzing trace with hash -734465068, now seen corresponding path program 6 times [2022-03-17 19:36:20,740 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 19:36:20,740 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [934411766] [2022-03-17 19:36:20,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 19:36:20,740 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 19:36:20,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:36:25,121 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 19:36:25,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:36:25,129 INFO L134 CoverageAnalysis]: Checked inductivity of 16595 backedges. 0 proven. 14884 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2022-03-17 19:36:25,129 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 19:36:25,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [934411766] [2022-03-17 19:36:25,129 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [934411766] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-17 19:36:25,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1026467362] [2022-03-17 19:36:25,130 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-17 19:36:25,130 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 19:36:25,130 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 19:36:25,131 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) [2022-03-17 19:36:25,131 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-17 19:41:50,728 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 59 check-sat command(s) [2022-03-17 19:41:50,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-17 19:41:50,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 825 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-17 19:41:50,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-17 19:41:51,480 INFO L134 CoverageAnalysis]: Checked inductivity of 16595 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 14884 trivial. 0 not checked. [2022-03-17 19:41:51,480 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-17 19:41:54,094 INFO L134 CoverageAnalysis]: Checked inductivity of 16595 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 14884 trivial. 0 not checked. [2022-03-17 19:41:54,095 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1026467362] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-17 19:41:54,095 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-17 19:41:54,095 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [126, 34, 34] total 159 [2022-03-17 19:41:54,095 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240024050] [2022-03-17 19:41:54,095 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-17 19:41:54,096 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 159 states [2022-03-17 19:41:54,096 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 19:41:54,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 159 interpolants. [2022-03-17 19:41:54,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12096, Invalid=13026, Unknown=0, NotChecked=0, Total=25122 [2022-03-17 19:41:54,100 INFO L87 Difference]: Start difference. First operand 376 states and 407 transitions. Second operand has 159 states, 159 states have (on average 3.169811320754717) internal successors, (504), 157 states have internal predecessors, (504), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:42:07,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 19:42:07,871 INFO L93 Difference]: Finished difference Result 1187 states and 1527 transitions. [2022-03-17 19:42:07,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 158 states. [2022-03-17 19:42:07,872 INFO L78 Accepts]: Start accepts. Automaton has has 159 states, 159 states have (on average 3.169811320754717) internal successors, (504), 157 states have internal predecessors, (504), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 375 [2022-03-17 19:42:07,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 19:42:07,876 INFO L225 Difference]: With dead ends: 1187 [2022-03-17 19:42:07,876 INFO L226 Difference]: Without dead ends: 936 [2022-03-17 19:42:07,882 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 1184 GetRequests, 871 SyntacticMatches, 1 SemanticMatches, 312 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13347 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=35975, Invalid=62307, Unknown=0, NotChecked=0, Total=98282 [2022-03-17 19:42:07,882 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 4376 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 1264 mSolverCounterSat, 1791 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4376 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 3055 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1791 IncrementalHoareTripleChecker+Valid, 1264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-03-17 19:42:07,883 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [4376 Valid, 56 Invalid, 3055 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1791 Valid, 1264 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-03-17 19:42:07,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 936 states. [2022-03-17 19:42:08,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 936 to 934. [2022-03-17 19:42:08,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 934 states, 929 states have (on average 1.1679224973089344) internal successors, (1085), 929 states have internal predecessors, (1085), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:42:08,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 934 states to 934 states and 1089 transitions. [2022-03-17 19:42:08,067 INFO L78 Accepts]: Start accepts. Automaton has 934 states and 1089 transitions. Word has length 375 [2022-03-17 19:42:08,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 19:42:08,068 INFO L478 AbstractCegarLoop]: Abstraction has 934 states and 1089 transitions. [2022-03-17 19:42:08,068 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 159 states, 159 states have (on average 3.169811320754717) internal successors, (504), 157 states have internal predecessors, (504), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:42:08,068 INFO L276 IsEmpty]: Start isEmpty. Operand 934 states and 1089 transitions. [2022-03-17 19:42:08,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 934 [2022-03-17 19:42:08,082 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 19:42:08,082 INFO L500 BasicCegarLoop]: trace histogram [154, 154, 153, 153, 153, 153, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 19:42:08,156 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-17 19:42:08,283 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 19:42:08,283 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 19:42:08,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 19:42:08,284 INFO L85 PathProgramCache]: Analyzing trace with hash -1253376950, now seen corresponding path program 7 times [2022-03-17 19:42:08,284 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 19:42:08,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [170996520] [2022-03-17 19:42:08,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 19:42:08,284 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 19:42:08,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:42:15,087 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 19:42:15,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:42:15,104 INFO L134 CoverageAnalysis]: Checked inductivity of 70380 backedges. 0 proven. 23409 refuted. 0 times theorem prover too weak. 46971 trivial. 0 not checked. [2022-03-17 19:42:15,104 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 19:42:15,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [170996520] [2022-03-17 19:42:15,104 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [170996520] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-17 19:42:15,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2028912414] [2022-03-17 19:42:15,105 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-03-17 19:42:15,105 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 19:42:15,105 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 19:42:15,112 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) [2022-03-17 19:42:15,113 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-17 19:42:15,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:42:15,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 2672 conjuncts, 155 conjunts are in the unsatisfiable core [2022-03-17 19:42:15,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-17 19:42:16,563 INFO L134 CoverageAnalysis]: Checked inductivity of 70380 backedges. 0 proven. 23409 refuted. 0 times theorem prover too weak. 46971 trivial. 0 not checked. [2022-03-17 19:42:16,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-17 19:42:36,690 INFO L134 CoverageAnalysis]: Checked inductivity of 70380 backedges. 0 proven. 23409 refuted. 0 times theorem prover too weak. 46971 trivial. 0 not checked. [2022-03-17 19:42:36,691 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2028912414] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-17 19:42:36,691 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-17 19:42:36,691 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [157, 156, 156] total 312 [2022-03-17 19:42:36,691 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588282253] [2022-03-17 19:42:36,691 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-17 19:42:36,693 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 312 states [2022-03-17 19:42:36,693 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 19:42:36,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 312 interpolants. [2022-03-17 19:42:36,701 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48207, Invalid=48825, Unknown=0, NotChecked=0, Total=97032 [2022-03-17 19:42:36,702 INFO L87 Difference]: Start difference. First operand 934 states and 1089 transitions. Second operand has 312 states, 312 states have (on average 2.0224358974358974) internal successors, (631), 311 states have internal predecessors, (631), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:44:19,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 19:44:19,764 INFO L93 Difference]: Finished difference Result 2641 states and 3415 transitions. [2022-03-17 19:44:19,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 311 states. [2022-03-17 19:44:19,765 INFO L78 Accepts]: Start accepts. Automaton has has 312 states, 312 states have (on average 2.0224358974358974) internal successors, (631), 311 states have internal predecessors, (631), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 933 [2022-03-17 19:44:19,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 19:44:19,770 INFO L225 Difference]: With dead ends: 2641 [2022-03-17 19:44:19,770 INFO L226 Difference]: Without dead ends: 2020 [2022-03-17 19:44:19,785 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 2331 GetRequests, 1713 SyntacticMatches, 0 SemanticMatches, 618 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59977 ImplicationChecksByTransitivity, 50.4s TimeCoverageRelationStatistics Valid=143996, Invalid=239784, Unknown=0, NotChecked=0, Total=383780 [2022-03-17 19:44:19,786 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 8378 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 2376 mSolverCounterSat, 2376 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8378 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 4752 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2376 IncrementalHoareTripleChecker+Valid, 2376 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-03-17 19:44:19,786 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [8378 Valid, 62 Invalid, 4752 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2376 Valid, 2376 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2022-03-17 19:44:19,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2020 states. [2022-03-17 19:44:19,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2020 to 1244. [2022-03-17 19:44:19,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1244 states, 1239 states have (on average 1.12590799031477) internal successors, (1395), 1239 states have internal predecessors, (1395), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:44:19,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1244 states to 1244 states and 1399 transitions. [2022-03-17 19:44:19,967 INFO L78 Accepts]: Start accepts. Automaton has 1244 states and 1399 transitions. Word has length 933 [2022-03-17 19:44:19,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 19:44:19,967 INFO L478 AbstractCegarLoop]: Abstraction has 1244 states and 1399 transitions. [2022-03-17 19:44:19,968 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 312 states, 312 states have (on average 2.0224358974358974) internal successors, (631), 311 states have internal predecessors, (631), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 19:44:19,968 INFO L276 IsEmpty]: Start isEmpty. Operand 1244 states and 1399 transitions. [2022-03-17 19:44:19,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1244 [2022-03-17 19:44:19,990 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 19:44:19,991 INFO L500 BasicCegarLoop]: trace histogram [308, 308, 154, 154, 153, 153, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 19:44:20,014 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-17 19:44:20,203 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,SelfDestructingSolverStorable10 [2022-03-17 19:44:20,203 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 19:44:20,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 19:44:20,204 INFO L85 PathProgramCache]: Analyzing trace with hash 6256564, now seen corresponding path program 8 times [2022-03-17 19:44:20,204 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 19:44:20,204 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1769973120] [2022-03-17 19:44:20,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 19:44:20,204 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 19:44:20,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:44:46,365 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 19:44:46,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 19:44:46,379 INFO L134 CoverageAnalysis]: Checked inductivity of 141835 backedges. 0 proven. 94864 refuted. 0 times theorem prover too weak. 46971 trivial. 0 not checked. [2022-03-17 19:44:46,379 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 19:44:46,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1769973120] [2022-03-17 19:44:46,379 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1769973120] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-17 19:44:46,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [506371137] [2022-03-17 19:44:46,379 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-17 19:44:46,379 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 19:44:46,379 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 19:44:46,381 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) [2022-03-17 19:44:46,382 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-17 19:44:47,062 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-17 19:44:47,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-17 19:44:47,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 4067 conjuncts, 310 conjunts are in the unsatisfiable core [2022-03-17 19:44:47,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-17 19:44:48,598 INFO L134 CoverageAnalysis]: Checked inductivity of 141835 backedges. 0 proven. 94864 refuted. 0 times theorem prover too weak. 46971 trivial. 0 not checked. [2022-03-17 19:44:48,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-17 19:46:06,994 INFO L134 CoverageAnalysis]: Checked inductivity of 141835 backedges. 0 proven. 94864 refuted. 0 times theorem prover too weak. 46971 trivial. 0 not checked. [2022-03-17 19:46:06,995 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [506371137] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-17 19:46:06,995 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-17 19:46:06,995 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [312, 311, 311] total 622 [2022-03-17 19:46:06,995 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090450114] [2022-03-17 19:46:06,995 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-17 19:46:06,997 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 622 states [2022-03-17 19:46:06,997 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 19:46:07,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 622 interpolants. [2022-03-17 19:46:07,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192512, Invalid=193750, Unknown=0, NotChecked=0, Total=386262 [2022-03-17 19:46:07,031 INFO L87 Difference]: Start difference. First operand 1244 states and 1399 transitions. Second operand has 622 states, 622 states have (on average 2.0112540192926045) internal successors, (1251), 621 states have internal predecessors, (1251), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)