/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/loops-crafted-1/mono-crafted_13.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-34549b5 [2022-04-06 10:15:28,164 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-06 10:15:28,165 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-06 10:15:28,195 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-04-06 10:15:28,201 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-04-06 10:15:28,201 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-04-06 10:15:28,202 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-04-06 10:15:28,203 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-04-06 10:15:28,206 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-04-06 10:15:28,209 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-04-06 10:15:28,211 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-04-06 10:15:28,212 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-04-06 10:15:28,213 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-04-06 10:15:28,216 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-04-06 10:15:28,216 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-04-06 10:15:28,217 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-04-06 10:15:28,218 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-04-06 10:15:28,219 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2022-04-06 10:15:28,224 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-04-06 10:15:28,225 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-04-06 10:15:28,231 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-04-06 10:15:28,231 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/loopacceleration/qvasr/qvasr_64.epf [2022-04-06 10:15:28,252 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-06 10:15:28,252 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-06 10:15:28,252 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-04-06 10:15:28,252 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-04-06 10:15:28,253 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-04-06 10:15:28,253 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-04-06 10:15:28,253 INFO L138 SettingsManager]: * Use SBE=true [2022-04-06 10:15:28,253 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-06 10:15:28,253 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-06 10:15:28,253 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-06 10:15:28,254 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-06 10:15:28,254 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-06 10:15:28,254 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-06 10:15:28,254 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-06 10:15:28,254 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-06 10:15:28,254 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-06 10:15:28,254 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-06 10:15:28,254 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-06 10:15:28,255 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-06 10:15:28,255 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 10:15:28,255 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-06 10:15:28,255 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-04-06 10:15:28,255 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-04-06 10:15:28,255 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-04-06 10:15:28,255 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-04-06 10:15:28,255 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-06 10:15:28,256 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-04-06 10:15:28,256 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-04-06 10:15:28,256 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2022-04-06 10:15:28,256 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-06 10:15:28,422 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-06 10:15:28,440 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-06 10:15:28,441 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-06 10:15:28,442 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-06 10:15:28,443 INFO L275 PluginConnector]: CDTParser initialized [2022-04-06 10:15:28,444 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_13.c [2022-04-06 10:15:28,495 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7b88f2a75/dbfb19beec65453ea97263b6ef1f2a02/FLAG022f4b93d [2022-04-06 10:15:28,846 INFO L306 CDTParser]: Found 1 translation units. [2022-04-06 10:15:28,852 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_13.c [2022-04-06 10:15:28,858 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7b88f2a75/dbfb19beec65453ea97263b6ef1f2a02/FLAG022f4b93d [2022-04-06 10:15:28,872 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7b88f2a75/dbfb19beec65453ea97263b6ef1f2a02 [2022-04-06 10:15:28,875 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-06 10:15:28,875 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2022-04-06 10:15:28,876 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-06 10:15:28,876 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-06 10:15:28,882 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-06 10:15:28,883 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 10:15:28" (1/1) ... [2022-04-06 10:15:28,883 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6c1d6689 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 10:15:28, skipping insertion in model container [2022-04-06 10:15:28,883 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 10:15:28" (1/1) ... [2022-04-06 10:15:28,887 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-06 10:15:28,894 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-06 10:15:28,993 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_13.c[319,332] [2022-04-06 10:15:29,007 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 10:15:29,011 INFO L203 MainTranslator]: Completed pre-run [2022-04-06 10:15:29,018 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_13.c[319,332] [2022-04-06 10:15:29,020 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 10:15:29,028 INFO L208 MainTranslator]: Completed translation [2022-04-06 10:15:29,029 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 10:15:29 WrapperNode [2022-04-06 10:15:29,029 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-06 10:15:29,029 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-06 10:15:29,030 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-06 10:15:29,030 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-06 10:15:29,036 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 10:15:29" (1/1) ... [2022-04-06 10:15:29,036 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 10:15:29" (1/1) ... [2022-04-06 10:15:29,040 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 10:15:29" (1/1) ... [2022-04-06 10:15:29,040 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 10:15:29" (1/1) ... [2022-04-06 10:15:29,046 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 10:15:29" (1/1) ... [2022-04-06 10:15:29,048 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 10:15:29" (1/1) ... [2022-04-06 10:15:29,049 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 10:15:29" (1/1) ... [2022-04-06 10:15:29,050 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-06 10:15:29,050 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-06 10:15:29,050 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-06 10:15:29,051 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-06 10:15:29,055 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 10:15:29" (1/1) ... [2022-04-06 10:15:29,063 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 10:15:29,076 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:15:29,085 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) [2022-04-06 10:15:29,086 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 [2022-04-06 10:15:29,108 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-06 10:15:29,108 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-06 10:15:29,108 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-06 10:15:29,109 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-06 10:15:29,109 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-06 10:15:29,109 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-06 10:15:29,109 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-06 10:15:29,109 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-06 10:15:29,109 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-06 10:15:29,109 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-06 10:15:29,109 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-06 10:15:29,109 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-06 10:15:29,109 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-06 10:15:29,109 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-06 10:15:29,109 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-06 10:15:29,110 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-06 10:15:29,110 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-06 10:15:29,148 INFO L234 CfgBuilder]: Building ICFG [2022-04-06 10:15:29,149 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-06 10:15:29,224 INFO L275 CfgBuilder]: Performing block encoding [2022-04-06 10:15:29,227 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-06 10:15:29,228 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-04-06 10:15:29,229 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 10:15:29 BoogieIcfgContainer [2022-04-06 10:15:29,229 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-06 10:15:29,229 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2022-04-06 10:15:29,229 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2022-04-06 10:15:29,239 INFO L275 PluginConnector]: IcfgTransformer initialized [2022-04-06 10:15:29,241 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 10:15:29" (1/1) ... [2022-04-06 10:15:29,243 INFO L168 ansformationObserver]: Applying ICFG transformation LOOP_ACCELERATION_QVASR [2022-04-06 10:15:29,251 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.04 10:15:29 BasicIcfg [2022-04-06 10:15:29,252 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2022-04-06 10:15:29,253 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-06 10:15:29,253 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-06 10:15:29,255 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-06 10:15:29,255 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.04 10:15:28" (1/4) ... [2022-04-06 10:15:29,256 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28de3cc2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 10:15:29, skipping insertion in model container [2022-04-06 10:15:29,256 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 10:15:29" (2/4) ... [2022-04-06 10:15:29,256 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28de3cc2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 10:15:29, skipping insertion in model container [2022-04-06 10:15:29,256 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 10:15:29" (3/4) ... [2022-04-06 10:15:29,256 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28de3cc2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.04 10:15:29, skipping insertion in model container [2022-04-06 10:15:29,256 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.04 10:15:29" (4/4) ... [2022-04-06 10:15:29,257 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_13.cqvasr [2022-04-06 10:15:29,260 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-04-06 10:15:29,260 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-06 10:15:29,288 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-06 10:15:29,292 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 [2022-04-06 10:15:29,292 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-06 10:15:29,306 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 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) [2022-04-06 10:15:29,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-04-06 10:15:29,309 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:15:29,310 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:15:29,310 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:15:29,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:15:29,313 INFO L85 PathProgramCache]: Analyzing trace with hash 164364990, now seen corresponding path program 1 times [2022-04-06 10:15:29,319 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:15:29,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [628695096] [2022-04-06 10:15:29,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:15:29,320 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:15:29,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:29,425 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:15:29,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:29,436 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 10:15:29,437 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:15:29,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [628695096] [2022-04-06 10:15:29,438 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [628695096] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 10:15:29,438 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 10:15:29,438 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 10:15:29,439 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638976120] [2022-04-06 10:15:29,440 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 10:15:29,442 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-04-06 10:15:29,443 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:15:29,459 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-04-06 10:15:29,459 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 10:15:29,461 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 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 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 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) [2022-04-06 10:15:29,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:15:29,483 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2022-04-06 10:15:29,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-04-06 10:15:29,485 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 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 12 [2022-04-06 10:15:29,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:15:29,489 INFO L225 Difference]: With dead ends: 34 [2022-04-06 10:15:29,489 INFO L226 Difference]: Without dead ends: 14 [2022-04-06 10:15:29,490 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 10:15:29,493 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 14 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 25 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 [2022-04-06 10:15:29,493 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 25 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 10:15:29,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-04-06 10:15:29,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-04-06 10:15:29,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 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) [2022-04-06 10:15:29,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2022-04-06 10:15:29,514 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 12 [2022-04-06 10:15:29,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:15:29,514 INFO L478 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2022-04-06 10:15:29,515 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 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) [2022-04-06 10:15:29,515 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2022-04-06 10:15:29,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-04-06 10:15:29,515 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:15:29,515 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:15:29,515 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-06 10:15:29,516 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:15:29,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:15:29,516 INFO L85 PathProgramCache]: Analyzing trace with hash 165288511, now seen corresponding path program 1 times [2022-04-06 10:15:29,516 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:15:29,516 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1602649777] [2022-04-06 10:15:29,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:15:29,517 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:15:29,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:29,569 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:15:29,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:29,594 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 10:15:29,594 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:15:29,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1602649777] [2022-04-06 10:15:29,595 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1602649777] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 10:15:29,595 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 10:15:29,595 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-04-06 10:15:29,595 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221229290] [2022-04-06 10:15:29,595 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 10:15:29,596 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-04-06 10:15:29,596 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:15:29,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-04-06 10:15:29,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-04-06 10:15:29,597 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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) [2022-04-06 10:15:29,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:15:29,628 INFO L93 Difference]: Finished difference Result 24 states and 30 transitions. [2022-04-06 10:15:29,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-04-06 10:15:29,630 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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 12 [2022-04-06 10:15:29,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:15:29,630 INFO L225 Difference]: With dead ends: 24 [2022-04-06 10:15:29,631 INFO L226 Difference]: Without dead ends: 16 [2022-04-06 10:15:29,633 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-04-06 10:15:29,633 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 12 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 10:15:29,634 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 21 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 10:15:29,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-04-06 10:15:29,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-04-06 10:15:29,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 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) [2022-04-06 10:15:29,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2022-04-06 10:15:29,638 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 12 [2022-04-06 10:15:29,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:15:29,639 INFO L478 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2022-04-06 10:15:29,639 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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) [2022-04-06 10:15:29,639 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2022-04-06 10:15:29,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-04-06 10:15:29,639 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:15:29,639 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:15:29,640 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-04-06 10:15:29,640 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:15:29,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:15:29,640 INFO L85 PathProgramCache]: Analyzing trace with hash -1054746269, now seen corresponding path program 1 times [2022-04-06 10:15:29,640 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:15:29,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [367587023] [2022-04-06 10:15:29,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:15:29,641 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:15:29,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:29,704 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:15:29,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:29,710 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 10:15:29,710 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:15:29,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [367587023] [2022-04-06 10:15:29,710 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [367587023] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 10:15:29,710 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 10:15:29,711 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-04-06 10:15:29,711 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843486542] [2022-04-06 10:15:29,711 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 10:15:29,711 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-04-06 10:15:29,711 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:15:29,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-04-06 10:15:29,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-04-06 10:15:29,712 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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) [2022-04-06 10:15:29,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:15:29,738 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2022-04-06 10:15:29,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-04-06 10:15:29,738 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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 14 [2022-04-06 10:15:29,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:15:29,739 INFO L225 Difference]: With dead ends: 22 [2022-04-06 10:15:29,739 INFO L226 Difference]: Without dead ends: 17 [2022-04-06 10:15:29,739 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-04-06 10:15:29,740 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 9 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 10:15:29,740 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 21 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 10:15:29,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-04-06 10:15:29,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-04-06 10:15:29,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 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) [2022-04-06 10:15:29,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2022-04-06 10:15:29,746 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 14 [2022-04-06 10:15:29,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:15:29,746 INFO L478 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2022-04-06 10:15:29,746 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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) [2022-04-06 10:15:29,746 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2022-04-06 10:15:29,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-04-06 10:15:29,747 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:15:29,748 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:15:29,748 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-04-06 10:15:29,748 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:15:29,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:15:29,749 INFO L85 PathProgramCache]: Analyzing trace with hash 1687477607, now seen corresponding path program 1 times [2022-04-06 10:15:29,749 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:15:29,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1513461957] [2022-04-06 10:15:29,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:15:29,751 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:15:29,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:29,800 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:15:29,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:29,806 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 10:15:29,807 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:15:29,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1513461957] [2022-04-06 10:15:29,808 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1513461957] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 10:15:29,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1693519878] [2022-04-06 10:15:29,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:15:29,808 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:15:29,809 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:15:29,810 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) [2022-04-06 10:15:29,811 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-04-06 10:15:29,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:29,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2022-04-06 10:15:29,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 10:15:29,907 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 10:15:29,907 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 10:15:29,956 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 10:15:29,956 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1693519878] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 10:15:29,956 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 10:15:29,956 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 8 [2022-04-06 10:15:29,957 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194857803] [2022-04-06 10:15:29,957 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 10:15:29,958 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-04-06 10:15:29,958 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:15:29,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-04-06 10:15:29,960 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2022-04-06 10:15:29,960 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 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) [2022-04-06 10:15:30,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:15:30,034 INFO L93 Difference]: Finished difference Result 30 states and 38 transitions. [2022-04-06 10:15:30,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-04-06 10:15:30,034 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 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 15 [2022-04-06 10:15:30,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:15:30,036 INFO L225 Difference]: With dead ends: 30 [2022-04-06 10:15:30,037 INFO L226 Difference]: Without dead ends: 21 [2022-04-06 10:15:30,039 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2022-04-06 10:15:30,043 INFO L913 BasicCegarLoop]: 13 mSDtfsCounter, 16 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 10:15:30,044 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 30 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 10:15:30,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-04-06 10:15:30,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2022-04-06 10:15:30,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 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) [2022-04-06 10:15:30,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2022-04-06 10:15:30,047 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 15 [2022-04-06 10:15:30,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:15:30,047 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2022-04-06 10:15:30,047 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 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) [2022-04-06 10:15:30,047 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2022-04-06 10:15:30,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-04-06 10:15:30,048 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:15:30,048 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:15:30,067 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-04-06 10:15:30,266 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:15:30,267 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:15:30,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:15:30,267 INFO L85 PathProgramCache]: Analyzing trace with hash 987258878, now seen corresponding path program 1 times [2022-04-06 10:15:30,267 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:15:30,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1593008716] [2022-04-06 10:15:30,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:15:30,267 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:15:30,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:30,311 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:15:30,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:30,318 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 10:15:30,318 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:15:30,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1593008716] [2022-04-06 10:15:30,318 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1593008716] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 10:15:30,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [571964854] [2022-04-06 10:15:30,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:15:30,318 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:15:30,319 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:15:30,319 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) [2022-04-06 10:15:30,330 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-04-06 10:15:30,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:30,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 4 conjunts are in the unsatisfiable core [2022-04-06 10:15:30,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 10:15:30,406 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 10:15:30,406 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 10:15:30,450 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 10:15:30,450 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [571964854] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 10:15:30,450 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 10:15:30,451 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 10 [2022-04-06 10:15:30,451 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706141099] [2022-04-06 10:15:30,451 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 10:15:30,451 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-04-06 10:15:30,451 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:15:30,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-04-06 10:15:30,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2022-04-06 10:15:30,452 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 10 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 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) [2022-04-06 10:15:30,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:15:30,524 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2022-04-06 10:15:30,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-04-06 10:15:30,525 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 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 19 [2022-04-06 10:15:30,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:15:30,525 INFO L225 Difference]: With dead ends: 38 [2022-04-06 10:15:30,526 INFO L226 Difference]: Without dead ends: 28 [2022-04-06 10:15:30,526 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2022-04-06 10:15:30,527 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 16 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 10:15:30,527 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 26 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 10:15:30,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-04-06 10:15:30,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-04-06 10:15:30,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 states have internal predecessors, (26), 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) [2022-04-06 10:15:30,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2022-04-06 10:15:30,536 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 19 [2022-04-06 10:15:30,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:15:30,536 INFO L478 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2022-04-06 10:15:30,536 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 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) [2022-04-06 10:15:30,536 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2022-04-06 10:15:30,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-04-06 10:15:30,538 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:15:30,539 INFO L499 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:15:30,554 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-04-06 10:15:30,743 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 [2022-04-06 10:15:30,743 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:15:30,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:15:30,744 INFO L85 PathProgramCache]: Analyzing trace with hash -1768540306, now seen corresponding path program 2 times [2022-04-06 10:15:30,744 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:15:30,744 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [897017464] [2022-04-06 10:15:30,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:15:30,744 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:15:30,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:30,815 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:15:30,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:30,827 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 10:15:30,827 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:15:30,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [897017464] [2022-04-06 10:15:30,827 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [897017464] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 10:15:30,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1853369742] [2022-04-06 10:15:30,827 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 10:15:30,827 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:15:30,827 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:15:30,831 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) [2022-04-06 10:15:30,832 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-04-06 10:15:30,860 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 10:15:30,860 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 10:15:30,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 8 conjunts are in the unsatisfiable core [2022-04-06 10:15:30,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 10:15:30,909 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 10:15:30,909 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 10:15:31,027 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 10:15:31,027 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1853369742] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 10:15:31,027 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 10:15:31,027 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 18 [2022-04-06 10:15:31,027 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1018073890] [2022-04-06 10:15:31,027 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 10:15:31,028 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-04-06 10:15:31,028 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:15:31,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-04-06 10:15:31,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2022-04-06 10:15:31,028 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 18 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 17 states have internal predecessors, (42), 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) [2022-04-06 10:15:31,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:15:31,172 INFO L93 Difference]: Finished difference Result 54 states and 66 transitions. [2022-04-06 10:15:31,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-04-06 10:15:31,173 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 17 states have internal predecessors, (42), 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 27 [2022-04-06 10:15:31,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:15:31,173 INFO L225 Difference]: With dead ends: 54 [2022-04-06 10:15:31,173 INFO L226 Difference]: Without dead ends: 44 [2022-04-06 10:15:31,174 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=377, Invalid=615, Unknown=0, NotChecked=0, Total=992 [2022-04-06 10:15:31,174 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 24 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 10:15:31,175 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 31 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 10:15:31,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-04-06 10:15:31,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2022-04-06 10:15:31,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 39 states have internal predecessors, (42), 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) [2022-04-06 10:15:31,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2022-04-06 10:15:31,181 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 27 [2022-04-06 10:15:31,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:15:31,182 INFO L478 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2022-04-06 10:15:31,182 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 17 states have internal predecessors, (42), 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) [2022-04-06 10:15:31,182 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2022-04-06 10:15:31,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-04-06 10:15:31,183 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:15:31,183 INFO L499 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:15:31,199 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-04-06 10:15:31,399 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 [2022-04-06 10:15:31,399 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:15:31,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:15:31,400 INFO L85 PathProgramCache]: Analyzing trace with hash 1912510030, now seen corresponding path program 3 times [2022-04-06 10:15:31,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:15:31,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1512673698] [2022-04-06 10:15:31,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:15:31,400 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:15:31,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:31,537 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:15:31,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:31,546 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 15 proven. 210 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 10:15:31,547 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:15:31,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1512673698] [2022-04-06 10:15:31,547 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1512673698] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 10:15:31,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1483494836] [2022-04-06 10:15:31,547 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-04-06 10:15:31,547 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:15:31,547 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:15:31,548 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) [2022-04-06 10:15:31,550 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-04-06 10:15:31,579 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-04-06 10:15:31,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 10:15:31,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 5 conjunts are in the unsatisfiable core [2022-04-06 10:15:31,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 10:15:31,738 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-04-06 10:15:31,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 10:15:31,837 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-04-06 10:15:31,837 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1483494836] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 10:15:31,837 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 10:15:31,838 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 5, 5] total 24 [2022-04-06 10:15:31,838 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720961728] [2022-04-06 10:15:31,838 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 10:15:31,838 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-04-06 10:15:31,838 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:15:31,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-04-06 10:15:31,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=387, Unknown=0, NotChecked=0, Total=552 [2022-04-06 10:15:31,839 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand has 24 states, 24 states have (on average 2.25) internal successors, (54), 23 states have internal predecessors, (54), 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) [2022-04-06 10:15:32,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:15:32,187 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2022-04-06 10:15:32,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-04-06 10:15:32,187 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.25) internal successors, (54), 23 states have internal predecessors, (54), 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 43 [2022-04-06 10:15:32,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:15:32,188 INFO L225 Difference]: With dead ends: 62 [2022-04-06 10:15:32,188 INFO L226 Difference]: Without dead ends: 52 [2022-04-06 10:15:32,188 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 333 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=609, Invalid=1371, Unknown=0, NotChecked=0, Total=1980 [2022-04-06 10:15:32,189 INFO L913 BasicCegarLoop]: 13 mSDtfsCounter, 62 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 10:15:32,189 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 35 Invalid, 151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 10:15:32,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-04-06 10:15:32,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 50. [2022-04-06 10:15:32,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.0666666666666667) internal successors, (48), 45 states have internal predecessors, (48), 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) [2022-04-06 10:15:32,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2022-04-06 10:15:32,193 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 43 [2022-04-06 10:15:32,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:15:32,193 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2022-04-06 10:15:32,193 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.25) internal successors, (54), 23 states have internal predecessors, (54), 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) [2022-04-06 10:15:32,194 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2022-04-06 10:15:32,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-04-06 10:15:32,194 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:15:32,194 INFO L499 BasicCegarLoop]: trace histogram [16, 15, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:15:32,212 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-04-06 10:15:32,410 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 [2022-04-06 10:15:32,410 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:15:32,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:15:32,411 INFO L85 PathProgramCache]: Analyzing trace with hash -534849494, now seen corresponding path program 4 times [2022-04-06 10:15:32,411 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:15:32,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1360983309] [2022-04-06 10:15:32,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:15:32,411 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:15:32,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:32,567 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:15:32,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:32,579 INFO L134 CoverageAnalysis]: Checked inductivity of 271 backedges. 16 proven. 240 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-04-06 10:15:32,579 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:15:32,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1360983309] [2022-04-06 10:15:32,579 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1360983309] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 10:15:32,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1503162894] [2022-04-06 10:15:32,579 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 10:15:32,579 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:15:32,579 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:15:32,580 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) [2022-04-06 10:15:32,581 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-04-06 10:15:32,615 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 10:15:32,615 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 10:15:32,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 17 conjunts are in the unsatisfiable core [2022-04-06 10:15:32,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 10:15:32,685 INFO L134 CoverageAnalysis]: Checked inductivity of 271 backedges. 16 proven. 240 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-04-06 10:15:32,685 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 10:15:33,034 INFO L134 CoverageAnalysis]: Checked inductivity of 271 backedges. 16 proven. 240 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-04-06 10:15:33,034 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1503162894] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 10:15:33,034 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 10:15:33,034 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 36 [2022-04-06 10:15:33,035 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [4695223] [2022-04-06 10:15:33,035 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 10:15:33,035 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-04-06 10:15:33,035 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:15:33,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-04-06 10:15:33,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2022-04-06 10:15:33,036 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand has 36 states, 36 states have (on average 2.1666666666666665) internal successors, (78), 35 states have internal predecessors, (78), 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) [2022-04-06 10:15:33,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:15:33,525 INFO L93 Difference]: Finished difference Result 98 states and 119 transitions. [2022-04-06 10:15:33,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-04-06 10:15:33,525 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.1666666666666665) internal successors, (78), 35 states have internal predecessors, (78), 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 49 [2022-04-06 10:15:33,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:15:33,526 INFO L225 Difference]: With dead ends: 98 [2022-04-06 10:15:33,526 INFO L226 Difference]: Without dead ends: 84 [2022-04-06 10:15:33,528 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 706 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1718, Invalid=2838, Unknown=0, NotChecked=0, Total=4556 [2022-04-06 10:15:33,529 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 42 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 117 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 10:15:33,529 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 46 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 117 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 10:15:33,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-04-06 10:15:33,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2022-04-06 10:15:33,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 79 states have (on average 1.0379746835443038) internal successors, (82), 79 states have internal predecessors, (82), 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) [2022-04-06 10:15:33,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2022-04-06 10:15:33,535 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 49 [2022-04-06 10:15:33,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:15:33,536 INFO L478 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2022-04-06 10:15:33,536 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.1666666666666665) internal successors, (78), 35 states have internal predecessors, (78), 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) [2022-04-06 10:15:33,536 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2022-04-06 10:15:33,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-04-06 10:15:33,537 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:15:33,537 INFO L499 BasicCegarLoop]: trace histogram [33, 32, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:15:33,557 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-04-06 10:15:33,754 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 [2022-04-06 10:15:33,755 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:15:33,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:15:33,755 INFO L85 PathProgramCache]: Analyzing trace with hash 83508550, now seen corresponding path program 5 times [2022-04-06 10:15:33,755 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:15:33,755 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1061409789] [2022-04-06 10:15:33,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:15:33,756 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:15:33,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:34,179 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:15:34,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:34,185 INFO L134 CoverageAnalysis]: Checked inductivity of 1104 backedges. 33 proven. 1056 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-04-06 10:15:34,185 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:15:34,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1061409789] [2022-04-06 10:15:34,185 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1061409789] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 10:15:34,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [822843050] [2022-04-06 10:15:34,186 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-04-06 10:15:34,186 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:15:34,186 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:15:34,186 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) [2022-04-06 10:15:34,187 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-04-06 10:15:34,238 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 34 check-sat command(s) [2022-04-06 10:15:34,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 10:15:34,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 34 conjunts are in the unsatisfiable core [2022-04-06 10:15:34,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 10:15:34,375 INFO L134 CoverageAnalysis]: Checked inductivity of 1104 backedges. 33 proven. 1056 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-04-06 10:15:34,376 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 10:15:35,449 INFO L134 CoverageAnalysis]: Checked inductivity of 1104 backedges. 33 proven. 1056 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-04-06 10:15:35,449 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [822843050] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 10:15:35,449 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 10:15:35,449 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 70 [2022-04-06 10:15:35,450 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584689929] [2022-04-06 10:15:35,450 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 10:15:35,453 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-04-06 10:15:35,453 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:15:35,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-04-06 10:15:35,455 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2348, Invalid=2482, Unknown=0, NotChecked=0, Total=4830 [2022-04-06 10:15:35,455 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand has 70 states, 70 states have (on average 2.085714285714286) internal successors, (146), 69 states have internal predecessors, (146), 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) [2022-04-06 10:15:37,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:15:37,080 INFO L93 Difference]: Finished difference Result 166 states and 204 transitions. [2022-04-06 10:15:37,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-04-06 10:15:37,080 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 2.085714285714286) internal successors, (146), 69 states have internal predecessors, (146), 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 83 [2022-04-06 10:15:37,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:15:37,081 INFO L225 Difference]: With dead ends: 166 [2022-04-06 10:15:37,081 INFO L226 Difference]: Without dead ends: 152 [2022-04-06 10:15:37,085 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2865 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=6903, Invalid=11457, Unknown=0, NotChecked=0, Total=18360 [2022-04-06 10:15:37,085 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 76 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-06 10:15:37,085 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 36 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 169 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-06 10:15:37,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2022-04-06 10:15:37,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 152. [2022-04-06 10:15:37,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 147 states have (on average 1.0204081632653061) internal successors, (150), 147 states have internal predecessors, (150), 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) [2022-04-06 10:15:37,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 154 transitions. [2022-04-06 10:15:37,095 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 154 transitions. Word has length 83 [2022-04-06 10:15:37,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:15:37,096 INFO L478 AbstractCegarLoop]: Abstraction has 152 states and 154 transitions. [2022-04-06 10:15:37,096 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 2.085714285714286) internal successors, (146), 69 states have internal predecessors, (146), 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) [2022-04-06 10:15:37,096 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 154 transitions. [2022-04-06 10:15:37,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2022-04-06 10:15:37,097 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:15:37,097 INFO L499 BasicCegarLoop]: trace histogram [67, 66, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:15:37,119 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-04-06 10:15:37,319 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 [2022-04-06 10:15:37,319 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:15:37,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:15:37,320 INFO L85 PathProgramCache]: Analyzing trace with hash 1884680830, now seen corresponding path program 6 times [2022-04-06 10:15:37,320 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:15:37,320 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1819072153] [2022-04-06 10:15:37,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:15:37,320 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:15:37,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:38,720 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:15:38,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:38,726 INFO L134 CoverageAnalysis]: Checked inductivity of 4504 backedges. 67 proven. 4422 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-04-06 10:15:38,726 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:15:38,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1819072153] [2022-04-06 10:15:38,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1819072153] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 10:15:38,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1596559103] [2022-04-06 10:15:38,727 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 10:15:38,727 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:15:38,727 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:15:38,728 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) [2022-04-06 10:15:38,728 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-04-06 10:15:38,771 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-04-06 10:15:38,772 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 10:15:38,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 4 conjunts are in the unsatisfiable core [2022-04-06 10:15:38,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 10:15:38,995 INFO L134 CoverageAnalysis]: Checked inductivity of 4504 backedges. 198 proven. 1 refuted. 0 times theorem prover too weak. 4305 trivial. 0 not checked. [2022-04-06 10:15:38,995 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 10:15:39,242 INFO L134 CoverageAnalysis]: Checked inductivity of 4504 backedges. 198 proven. 1 refuted. 0 times theorem prover too weak. 4305 trivial. 0 not checked. [2022-04-06 10:15:39,243 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1596559103] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 10:15:39,243 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 10:15:39,243 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 4, 4] total 74 [2022-04-06 10:15:39,245 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964458682] [2022-04-06 10:15:39,245 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 10:15:39,246 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2022-04-06 10:15:39,246 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:15:39,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2022-04-06 10:15:39,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2630, Invalid=2772, Unknown=0, NotChecked=0, Total=5402 [2022-04-06 10:15:39,248 INFO L87 Difference]: Start difference. First operand 152 states and 154 transitions. Second operand has 74 states, 74 states have (on average 2.0945945945945947) internal successors, (155), 73 states have internal predecessors, (155), 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) [2022-04-06 10:15:41,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:15:41,212 INFO L93 Difference]: Finished difference Result 174 states and 185 transitions. [2022-04-06 10:15:41,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-04-06 10:15:41,212 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 2.0945945945945947) internal successors, (155), 73 states have internal predecessors, (155), 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 151 [2022-04-06 10:15:41,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:15:41,214 INFO L225 Difference]: With dead ends: 174 [2022-04-06 10:15:41,214 INFO L226 Difference]: Without dead ends: 160 [2022-04-06 10:15:41,218 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 446 GetRequests, 303 SyntacticMatches, 0 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2551 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=7884, Invalid=12996, Unknown=0, NotChecked=0, Total=20880 [2022-04-06 10:15:41,219 INFO L913 BasicCegarLoop]: 13 mSDtfsCounter, 219 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 190 mSolverCounterSat, 226 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 219 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 416 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 226 IncrementalHoareTripleChecker+Valid, 190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-06 10:15:41,219 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [219 Valid, 45 Invalid, 416 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [226 Valid, 190 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-06 10:15:41,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2022-04-06 10:15:41,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2022-04-06 10:15:41,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 155 states have (on average 1.038709677419355) internal successors, (161), 155 states have internal predecessors, (161), 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) [2022-04-06 10:15:41,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 165 transitions. [2022-04-06 10:15:41,230 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 165 transitions. Word has length 151 [2022-04-06 10:15:41,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:15:41,230 INFO L478 AbstractCegarLoop]: Abstraction has 160 states and 165 transitions. [2022-04-06 10:15:41,230 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 2.0945945945945947) internal successors, (155), 73 states have internal predecessors, (155), 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) [2022-04-06 10:15:41,230 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 165 transitions. [2022-04-06 10:15:41,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2022-04-06 10:15:41,231 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:15:41,231 INFO L499 BasicCegarLoop]: trace histogram [71, 67, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:15:41,249 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-04-06 10:15:41,442 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 [2022-04-06 10:15:41,442 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:15:41,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:15:41,443 INFO L85 PathProgramCache]: Analyzing trace with hash 68492171, now seen corresponding path program 7 times [2022-04-06 10:15:41,443 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:15:41,443 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [106528768] [2022-04-06 10:15:41,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:15:41,443 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:15:41,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:42,871 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:15:42,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:42,882 INFO L134 CoverageAnalysis]: Checked inductivity of 5056 backedges. 476 proven. 4556 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-04-06 10:15:42,882 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:15:42,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [106528768] [2022-04-06 10:15:42,883 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [106528768] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 10:15:42,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [514022841] [2022-04-06 10:15:42,883 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-04-06 10:15:42,883 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:15:42,883 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:15:42,884 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) [2022-04-06 10:15:42,884 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-04-06 10:15:42,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:42,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 69 conjunts are in the unsatisfiable core [2022-04-06 10:15:42,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 10:15:43,246 INFO L134 CoverageAnalysis]: Checked inductivity of 5056 backedges. 476 proven. 4556 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-04-06 10:15:43,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 10:15:47,205 INFO L134 CoverageAnalysis]: Checked inductivity of 5056 backedges. 476 proven. 4556 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-04-06 10:15:47,205 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [514022841] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 10:15:47,205 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 10:15:47,206 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 70, 70] total 140 [2022-04-06 10:15:47,206 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238483924] [2022-04-06 10:15:47,206 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 10:15:47,207 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 140 states [2022-04-06 10:15:47,208 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:15:47,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2022-04-06 10:15:47,211 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9593, Invalid=9867, Unknown=0, NotChecked=0, Total=19460 [2022-04-06 10:15:47,211 INFO L87 Difference]: Start difference. First operand 160 states and 165 transitions. Second operand has 140 states, 140 states have (on average 2.057142857142857) internal successors, (288), 139 states have internal predecessors, (288), 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) [2022-04-06 10:15:52,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:15:52,807 INFO L93 Difference]: Finished difference Result 318 states and 397 transitions. [2022-04-06 10:15:52,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2022-04-06 10:15:52,808 INFO L78 Accepts]: Start accepts. Automaton has has 140 states, 140 states have (on average 2.057142857142857) internal successors, (288), 139 states have internal predecessors, (288), 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 159 [2022-04-06 10:15:52,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:15:52,809 INFO L225 Difference]: With dead ends: 318 [2022-04-06 10:15:52,809 INFO L226 Difference]: Without dead ends: 298 [2022-04-06 10:15:52,813 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 525 GetRequests, 251 SyntacticMatches, 0 SemanticMatches, 274 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11860 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=28498, Invalid=47402, Unknown=0, NotChecked=0, Total=75900 [2022-04-06 10:15:52,813 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 146 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 213 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 520 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 213 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 10:15:52,813 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [146 Valid, 36 Invalid, 520 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [213 Valid, 307 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 10:15:52,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2022-04-06 10:15:52,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 298. [2022-04-06 10:15:52,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 298 states, 293 states have (on average 1.0204778156996588) internal successors, (299), 293 states have internal predecessors, (299), 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) [2022-04-06 10:15:52,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 303 transitions. [2022-04-06 10:15:52,829 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 303 transitions. Word has length 159 [2022-04-06 10:15:52,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:15:52,830 INFO L478 AbstractCegarLoop]: Abstraction has 298 states and 303 transitions. [2022-04-06 10:15:52,830 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 140 states, 140 states have (on average 2.057142857142857) internal successors, (288), 139 states have internal predecessors, (288), 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) [2022-04-06 10:15:52,830 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 303 transitions. [2022-04-06 10:15:52,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2022-04-06 10:15:52,836 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:15:52,836 INFO L499 BasicCegarLoop]: trace histogram [140, 136, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:15:52,852 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-04-06 10:15:53,036 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 [2022-04-06 10:15:53,037 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:15:53,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:15:53,037 INFO L85 PathProgramCache]: Analyzing trace with hash -1833554857, now seen corresponding path program 8 times [2022-04-06 10:15:53,038 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:15:53,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [663168023] [2022-04-06 10:15:53,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:15:53,038 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:15:53,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:58,326 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:15:58,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:15:58,342 INFO L134 CoverageAnalysis]: Checked inductivity of 19615 backedges. 959 proven. 18632 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-04-06 10:15:58,342 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:15:58,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [663168023] [2022-04-06 10:15:58,342 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [663168023] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 10:15:58,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [885026180] [2022-04-06 10:15:58,343 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 10:15:58,343 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:15:58,343 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:15:58,343 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) [2022-04-06 10:15:58,344 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-04-06 10:15:58,440 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 10:15:58,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 10:15:58,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 649 conjuncts, 138 conjunts are in the unsatisfiable core [2022-04-06 10:15:58,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 10:15:58,928 INFO L134 CoverageAnalysis]: Checked inductivity of 19615 backedges. 959 proven. 18632 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-04-06 10:15:58,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 10:16:14,395 INFO L134 CoverageAnalysis]: Checked inductivity of 19615 backedges. 959 proven. 18632 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-04-06 10:16:14,395 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [885026180] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 10:16:14,395 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 10:16:14,395 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [140, 139, 139] total 278 [2022-04-06 10:16:14,396 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877522525] [2022-04-06 10:16:14,396 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 10:16:14,397 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 278 states [2022-04-06 10:16:14,397 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:16:14,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 278 interpolants. [2022-04-06 10:16:14,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38228, Invalid=38778, Unknown=0, NotChecked=0, Total=77006 [2022-04-06 10:16:14,406 INFO L87 Difference]: Start difference. First operand 298 states and 303 transitions. Second operand has 278 states, 278 states have (on average 2.028776978417266) internal successors, (564), 277 states have internal predecessors, (564), 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) [2022-04-06 10:16:36,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:16:36,617 INFO L93 Difference]: Finished difference Result 594 states and 742 transitions. [2022-04-06 10:16:36,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 277 states. [2022-04-06 10:16:36,617 INFO L78 Accepts]: Start accepts. Automaton has has 278 states, 278 states have (on average 2.028776978417266) internal successors, (564), 277 states have internal predecessors, (564), 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 297 [2022-04-06 10:16:36,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:16:36,619 INFO L225 Difference]: With dead ends: 594 [2022-04-06 10:16:36,619 INFO L226 Difference]: Without dead ends: 574 [2022-04-06 10:16:36,631 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 1008 GetRequests, 458 SyntacticMatches, 0 SemanticMatches, 550 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47533 ImplicationChecksByTransitivity, 40.6s TimeCoverageRelationStatistics Valid=114127, Invalid=190025, Unknown=0, NotChecked=0, Total=304152 [2022-04-06 10:16:36,631 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 284 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 615 mSolverCounterSat, 421 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 284 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 1036 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 421 IncrementalHoareTripleChecker+Valid, 615 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-04-06 10:16:36,632 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [284 Valid, 56 Invalid, 1036 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [421 Valid, 615 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-04-06 10:16:36,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 574 states. [2022-04-06 10:16:36,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 574 to 574. [2022-04-06 10:16:36,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 574 states, 569 states have (on average 1.0105448154657293) internal successors, (575), 569 states have internal predecessors, (575), 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) [2022-04-06 10:16:36,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 574 states to 574 states and 579 transitions. [2022-04-06 10:16:36,657 INFO L78 Accepts]: Start accepts. Automaton has 574 states and 579 transitions. Word has length 297 [2022-04-06 10:16:36,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:16:36,657 INFO L478 AbstractCegarLoop]: Abstraction has 574 states and 579 transitions. [2022-04-06 10:16:36,657 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 278 states, 278 states have (on average 2.028776978417266) internal successors, (564), 277 states have internal predecessors, (564), 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) [2022-04-06 10:16:36,657 INFO L276 IsEmpty]: Start isEmpty. Operand 574 states and 579 transitions. [2022-04-06 10:16:36,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 574 [2022-04-06 10:16:36,663 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:16:36,664 INFO L499 BasicCegarLoop]: trace histogram [278, 274, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:16:36,685 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-04-06 10:16:36,879 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:16:36,879 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:16:36,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:16:36,880 INFO L85 PathProgramCache]: Analyzing trace with hash -670818065, now seen corresponding path program 9 times [2022-04-06 10:16:36,880 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:16:36,880 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1242895446] [2022-04-06 10:16:36,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:16:36,880 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:16:37,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:57,426 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:16:57,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:57,441 INFO L134 CoverageAnalysis]: Checked inductivity of 77299 backedges. 1925 proven. 75350 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-04-06 10:16:57,442 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:16:57,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1242895446] [2022-04-06 10:16:57,442 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1242895446] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 10:16:57,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [360775825] [2022-04-06 10:16:57,442 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-04-06 10:16:57,442 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:16:57,442 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:16:57,443 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 10:16:57,445 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-04-06 10:16:57,510 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-04-06 10:16:57,510 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 10:16:57,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 12 conjunts are in the unsatisfiable core [2022-04-06 10:16:57,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 10:16:59,954 INFO L134 CoverageAnalysis]: Checked inductivity of 77299 backedges. 1934 proven. 15 refuted. 0 times theorem prover too weak. 75350 trivial. 0 not checked. [2022-04-06 10:16:59,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 10:17:01,532 INFO L134 CoverageAnalysis]: Checked inductivity of 77299 backedges. 1934 proven. 15 refuted. 0 times theorem prover too weak. 75350 trivial. 0 not checked. [2022-04-06 10:17:01,533 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [360775825] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 10:17:01,533 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 10:17:01,533 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [278, 10, 10] total 294 [2022-04-06 10:17:01,533 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440827530] [2022-04-06 10:17:01,533 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 10:17:01,534 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 294 states [2022-04-06 10:17:01,534 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:17:01,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 294 interpolants. [2022-04-06 10:17:01,541 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38380, Invalid=47762, Unknown=0, NotChecked=0, Total=86142 [2022-04-06 10:17:01,541 INFO L87 Difference]: Start difference. First operand 574 states and 579 transitions. Second operand has 294 states, 294 states have (on average 2.0272108843537415) internal successors, (596), 293 states have internal predecessors, (596), 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) [2022-04-06 10:17:31,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:17:31,790 INFO L93 Difference]: Finished difference Result 625 states and 655 transitions. [2022-04-06 10:17:31,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 293 states. [2022-04-06 10:17:31,791 INFO L78 Accepts]: Start accepts. Automaton has has 294 states, 294 states have (on average 2.0272108843537415) internal successors, (596), 293 states have internal predecessors, (596), 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 573 [2022-04-06 10:17:31,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:17:31,793 INFO L225 Difference]: With dead ends: 625 [2022-04-06 10:17:31,793 INFO L226 Difference]: Without dead ends: 605 [2022-04-06 10:17:31,807 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 1714 GetRequests, 1132 SyntacticMatches, 0 SemanticMatches, 582 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48475 ImplicationChecksByTransitivity, 49.6s TimeCoverageRelationStatistics Valid=119790, Invalid=220682, Unknown=0, NotChecked=0, Total=340472 [2022-04-06 10:17:31,807 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 851 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 790 mSolverCounterSat, 1421 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 851 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 2211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1421 IncrementalHoareTripleChecker+Valid, 790 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-04-06 10:17:31,808 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [851 Valid, 81 Invalid, 2211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1421 Valid, 790 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-04-06 10:17:31,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 605 states. [2022-04-06 10:17:31,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 605 to 585. [2022-04-06 10:17:31,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 585 states, 580 states have (on average 1.0103448275862068) internal successors, (586), 580 states have internal predecessors, (586), 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) [2022-04-06 10:17:31,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 585 states to 585 states and 590 transitions. [2022-04-06 10:17:31,829 INFO L78 Accepts]: Start accepts. Automaton has 585 states and 590 transitions. Word has length 573 [2022-04-06 10:17:31,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:17:31,830 INFO L478 AbstractCegarLoop]: Abstraction has 585 states and 590 transitions. [2022-04-06 10:17:31,830 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 294 states, 294 states have (on average 2.0272108843537415) internal successors, (596), 293 states have internal predecessors, (596), 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) [2022-04-06 10:17:31,830 INFO L276 IsEmpty]: Start isEmpty. Operand 585 states and 590 transitions. [2022-04-06 10:17:31,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 585 [2022-04-06 10:17:31,835 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:17:31,836 INFO L499 BasicCegarLoop]: trace histogram [279, 275, 14, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:17:31,852 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-04-06 10:17:32,047 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-04-06 10:17:32,048 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:17:32,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:17:32,048 INFO L85 PathProgramCache]: Analyzing trace with hash -2013652097, now seen corresponding path program 10 times [2022-04-06 10:17:32,048 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:17:32,048 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [107261218] [2022-04-06 10:17:32,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:17:32,048 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:17:32,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:17:52,818 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:17:52,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:17:52,840 INFO L134 CoverageAnalysis]: Checked inductivity of 77946 backedges. 1932 proven. 75900 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2022-04-06 10:17:52,840 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:17:52,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [107261218] [2022-04-06 10:17:52,841 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [107261218] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 10:17:52,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658867536] [2022-04-06 10:17:52,841 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 10:17:52,841 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:17:52,841 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:17:52,842 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 10:17:52,843 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-04-06 10:17:52,996 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 10:17:52,996 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 10:17:53,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 1250 conjuncts, 277 conjunts are in the unsatisfiable core [2022-04-06 10:17:53,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 10:17:53,900 INFO L134 CoverageAnalysis]: Checked inductivity of 77946 backedges. 1932 proven. 75900 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2022-04-06 10:17:53,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 10:18:56,419 INFO L134 CoverageAnalysis]: Checked inductivity of 77946 backedges. 1932 proven. 75900 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2022-04-06 10:18:56,419 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1658867536] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 10:18:56,419 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 10:18:56,419 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [279, 278, 278] total 556 [2022-04-06 10:18:56,420 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217270276] [2022-04-06 10:18:56,420 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 10:18:56,423 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 556 states [2022-04-06 10:18:56,423 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:18:56,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 556 interpolants. [2022-04-06 10:18:56,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153737, Invalid=154843, Unknown=0, NotChecked=0, Total=308580 [2022-04-06 10:18:56,451 INFO L87 Difference]: Start difference. First operand 585 states and 590 transitions. Second operand has 556 states, 556 states have (on average 2.014388489208633) internal successors, (1120), 555 states have internal predecessors, (1120), 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) [2022-04-06 10:20:28,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:20:28,621 INFO L93 Difference]: Finished difference Result 1168 states and 1455 transitions. [2022-04-06 10:20:28,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 555 states. [2022-04-06 10:20:28,622 INFO L78 Accepts]: Start accepts. Automaton has has 556 states, 556 states have (on average 2.014388489208633) internal successors, (1120), 555 states have internal predecessors, (1120), 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 584 [2022-04-06 10:20:28,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:20:28,625 INFO L225 Difference]: With dead ends: 1168 [2022-04-06 10:20:28,625 INFO L226 Difference]: Without dead ends: 1139 [2022-04-06 10:20:28,688 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 1999 GetRequests, 893 SyntacticMatches, 0 SemanticMatches, 1106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191676 ImplicationChecksByTransitivity, 165.5s TimeCoverageRelationStatistics Valid=460098, Invalid=766458, Unknown=0, NotChecked=0, Total=1226556 [2022-04-06 10:20:28,689 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 562 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 1149 mSolverCounterSat, 833 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 562 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 1982 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 833 IncrementalHoareTripleChecker+Valid, 1149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-04-06 10:20:28,689 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [562 Valid, 41 Invalid, 1982 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [833 Valid, 1149 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-04-06 10:20:28,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1139 states. [2022-04-06 10:20:28,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1139 to 1139. [2022-04-06 10:20:28,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1139 states, 1134 states have (on average 1.0052910052910053) internal successors, (1140), 1134 states have internal predecessors, (1140), 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) [2022-04-06 10:20:28,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1139 states to 1139 states and 1144 transitions. [2022-04-06 10:20:28,736 INFO L78 Accepts]: Start accepts. Automaton has 1139 states and 1144 transitions. Word has length 584 [2022-04-06 10:20:28,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:20:28,736 INFO L478 AbstractCegarLoop]: Abstraction has 1139 states and 1144 transitions. [2022-04-06 10:20:28,737 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 556 states, 556 states have (on average 2.014388489208633) internal successors, (1120), 555 states have internal predecessors, (1120), 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) [2022-04-06 10:20:28,737 INFO L276 IsEmpty]: Start isEmpty. Operand 1139 states and 1144 transitions. [2022-04-06 10:20:28,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1139 [2022-04-06 10:20:28,747 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:20:28,747 INFO L499 BasicCegarLoop]: trace histogram [556, 552, 14, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:20:28,766 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-04-06 10:20:28,963 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-04-06 10:20:28,963 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:20:28,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:20:28,964 INFO L85 PathProgramCache]: Analyzing trace with hash 273589619, now seen corresponding path program 11 times [2022-04-06 10:20:28,964 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:20:28,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [933786339] [2022-04-06 10:20:28,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:20:28,964 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:20:29,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:21:53,217 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:21:53,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:21:53,237 INFO L134 CoverageAnalysis]: Checked inductivity of 309241 backedges. 3871 proven. 305256 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2022-04-06 10:21:53,237 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:21:53,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [933786339] [2022-04-06 10:21:53,237 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [933786339] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 10:21:53,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [327702498] [2022-04-06 10:21:53,238 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-04-06 10:21:53,238 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:21:53,238 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:21:53,239 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 10:21:53,239 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-04-06 10:21:54,975 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 557 check-sat command(s) [2022-04-06 10:21:54,975 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 10:21:54,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 2358 conjuncts, 554 conjunts are in the unsatisfiable core [2022-04-06 10:21:55,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 10:21:56,738 INFO L134 CoverageAnalysis]: Checked inductivity of 309241 backedges. 3871 proven. 305256 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2022-04-06 10:21:56,739 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 10:26:18,722 INFO L134 CoverageAnalysis]: Checked inductivity of 309241 backedges. 3871 proven. 305256 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2022-04-06 10:26:18,723 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [327702498] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 10:26:18,723 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 10:26:18,724 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [556, 555, 555] total 1110 [2022-04-06 10:26:18,724 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2086378455] [2022-04-06 10:26:18,724 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 10:26:18,727 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 1110 states [2022-04-06 10:26:18,727 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:26:18,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 1110 interpolants. [2022-04-06 10:26:18,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=614388, Invalid=616602, Unknown=0, NotChecked=0, Total=1230990 [2022-04-06 10:26:18,947 INFO L87 Difference]: Start difference. First operand 1139 states and 1144 transitions. Second operand has 1110 states, 1110 states have (on average 2.007207207207207) internal successors, (2228), 1109 states have internal predecessors, (2228), 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)