/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/in-de32.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-7390193 [2022-04-05 05:48:11,149 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-05 05:48:11,151 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-05 05:48:11,195 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-04-05 05:48:11,217 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-04-05 05:48:11,218 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-04-05 05:48:11,218 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-04-05 05:48:11,219 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-04-05 05:48:11,219 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-04-05 05:48:11,220 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-04-05 05:48:11,221 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-04-05 05:48:11,222 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-04-05 05:48:11,223 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-04-05 05:48:11,226 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-04-05 05:48:11,227 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-04-05 05:48:11,228 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-04-05 05:48:11,228 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-04-05 05:48:11,230 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2022-04-05 05:48:11,236 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-04-05 05:48:11,237 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-04-05 05:48:11,237 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-04-05 05:48:11,238 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/loopacceleration/qvasr/qvasr_64.epf [2022-04-05 05:48:11,264 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-05 05:48:11,265 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-05 05:48:11,266 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-04-05 05:48:11,266 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-04-05 05:48:11,267 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-04-05 05:48:11,267 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-04-05 05:48:11,267 INFO L138 SettingsManager]: * Use SBE=true [2022-04-05 05:48:11,267 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-05 05:48:11,267 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-05 05:48:11,268 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-05 05:48:11,268 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-05 05:48:11,268 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-05 05:48:11,268 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-05 05:48:11,268 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-05 05:48:11,269 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-05 05:48:11,269 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-05 05:48:11,269 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-05 05:48:11,269 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-05 05:48:11,269 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-05 05:48:11,269 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-05 05:48:11,269 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-05 05:48:11,269 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-04-05 05:48:11,270 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-04-05 05:48:11,270 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-04-05 05:48:11,270 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-04-05 05:48:11,270 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-05 05:48:11,270 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-04-05 05:48:11,270 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-04-05 05:48:11,271 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2022-04-05 05:48:11,271 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-05 05:48:11,471 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-05 05:48:11,494 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-05 05:48:11,496 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-05 05:48:11,497 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-05 05:48:11,497 INFO L275 PluginConnector]: CDTParser initialized [2022-04-05 05:48:11,498 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/in-de32.c [2022-04-05 05:48:11,548 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f4b4a3829/7634ca6ad03a45ec8230424850f3ff3b/FLAGe43dc6ecc [2022-04-05 05:48:11,835 INFO L306 CDTParser]: Found 1 translation units. [2022-04-05 05:48:11,836 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de32.c [2022-04-05 05:48:11,842 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f4b4a3829/7634ca6ad03a45ec8230424850f3ff3b/FLAGe43dc6ecc [2022-04-05 05:48:12,285 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f4b4a3829/7634ca6ad03a45ec8230424850f3ff3b [2022-04-05 05:48:12,287 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-05 05:48:12,288 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2022-04-05 05:48:12,291 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-05 05:48:12,291 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-05 05:48:12,295 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-05 05:48:12,296 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.04 05:48:12" (1/1) ... [2022-04-05 05:48:12,297 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3cc47313 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 05:48:12, skipping insertion in model container [2022-04-05 05:48:12,298 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.04 05:48:12" (1/1) ... [2022-04-05 05:48:12,303 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-05 05:48:12,313 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-05 05:48:12,424 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/in-de32.c[368,381] [2022-04-05 05:48:12,446 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-05 05:48:12,451 INFO L203 MainTranslator]: Completed pre-run [2022-04-05 05:48:12,458 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/in-de32.c[368,381] [2022-04-05 05:48:12,460 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-05 05:48:12,469 INFO L208 MainTranslator]: Completed translation [2022-04-05 05:48:12,469 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 05:48:12 WrapperNode [2022-04-05 05:48:12,469 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-05 05:48:12,470 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-05 05:48:12,470 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-05 05:48:12,470 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-05 05:48:12,477 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 05:48:12" (1/1) ... [2022-04-05 05:48:12,477 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 05:48:12" (1/1) ... [2022-04-05 05:48:12,481 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 05:48:12" (1/1) ... [2022-04-05 05:48:12,482 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 05:48:12" (1/1) ... [2022-04-05 05:48:12,487 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 05:48:12" (1/1) ... [2022-04-05 05:48:12,490 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 05:48:12" (1/1) ... [2022-04-05 05:48:12,491 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 05:48:12" (1/1) ... [2022-04-05 05:48:12,492 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-05 05:48:12,492 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-05 05:48:12,492 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-05 05:48:12,492 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-05 05:48:12,495 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 05:48:12" (1/1) ... [2022-04-05 05:48:12,500 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-05 05:48:12,507 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:48:12,517 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) [2022-04-05 05:48:12,523 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 [2022-04-05 05:48:12,542 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-05 05:48:12,542 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-05 05:48:12,542 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-05 05:48:12,542 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-05 05:48:12,542 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-05 05:48:12,542 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-05 05:48:12,542 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-05 05:48:12,542 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-05 05:48:12,542 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-05 05:48:12,542 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-04-05 05:48:12,542 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-05 05:48:12,543 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-05 05:48:12,543 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-05 05:48:12,543 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-05 05:48:12,543 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-05 05:48:12,543 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-05 05:48:12,543 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-05 05:48:12,543 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-05 05:48:12,585 INFO L234 CfgBuilder]: Building ICFG [2022-04-05 05:48:12,586 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-05 05:48:12,658 INFO L275 CfgBuilder]: Performing block encoding [2022-04-05 05:48:12,662 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-05 05:48:12,662 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2022-04-05 05:48:12,663 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.04 05:48:12 BoogieIcfgContainer [2022-04-05 05:48:12,663 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-05 05:48:12,664 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2022-04-05 05:48:12,664 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2022-04-05 05:48:12,664 INFO L275 PluginConnector]: IcfgTransformer initialized [2022-04-05 05:48:12,666 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.04 05:48:12" (1/1) ... [2022-04-05 05:48:12,672 INFO L168 ansformationObserver]: Applying ICFG transformation LOOP_ACCELERATION_QVASR [2022-04-05 05:48:12,692 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 05.04 05:48:12 BasicIcfg [2022-04-05 05:48:12,692 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2022-04-05 05:48:12,694 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-05 05:48:12,694 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-05 05:48:12,697 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-05 05:48:12,698 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 05.04 05:48:12" (1/4) ... [2022-04-05 05:48:12,698 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2dd44fc0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.04 05:48:12, skipping insertion in model container [2022-04-05 05:48:12,698 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 05:48:12" (2/4) ... [2022-04-05 05:48:12,698 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2dd44fc0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.04 05:48:12, skipping insertion in model container [2022-04-05 05:48:12,698 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.04 05:48:12" (3/4) ... [2022-04-05 05:48:12,699 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2dd44fc0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 05.04 05:48:12, skipping insertion in model container [2022-04-05 05:48:12,699 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 05.04 05:48:12" (4/4) ... [2022-04-05 05:48:12,699 INFO L111 eAbstractionObserver]: Analyzing ICFG in-de32.cqvasr [2022-04-05 05:48:12,703 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-04-05 05:48:12,703 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-05 05:48:12,747 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-05 05:48:12,752 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 [2022-04-05 05:48:12,752 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-05 05:48:12,763 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 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) [2022-04-05 05:48:12,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-04-05 05:48:12,767 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:48:12,767 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:48:12,767 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:48:12,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:48:12,771 INFO L85 PathProgramCache]: Analyzing trace with hash -1909530012, now seen corresponding path program 1 times [2022-04-05 05:48:12,777 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:48:12,778 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [225258053] [2022-04-05 05:48:12,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:12,778 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:48:12,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:12,906 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:48:12,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:12,918 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-05 05:48:12,918 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:48:12,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [225258053] [2022-04-05 05:48:12,919 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [225258053] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-05 05:48:12,919 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-05 05:48:12,919 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-05 05:48:12,920 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995507089] [2022-04-05 05:48:12,921 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 05:48:12,924 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-04-05 05:48:12,924 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:48:12,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-04-05 05:48:12,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-05 05:48:12,951 INFO L87 Difference]: Start difference. First operand has 22 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 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) [2022-04-05 05:48:12,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:48:12,995 INFO L93 Difference]: Finished difference Result 37 states and 48 transitions. [2022-04-05 05:48:12,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-04-05 05:48:12,997 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 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 [2022-04-05 05:48:12,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:48:13,008 INFO L225 Difference]: With dead ends: 37 [2022-04-05 05:48:13,008 INFO L226 Difference]: Without dead ends: 15 [2022-04-05 05:48:13,013 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 [2022-04-05 05:48:13,017 INFO L913 BasicCegarLoop]: 23 mSDtfsCounter, 15 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 26 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 [2022-04-05 05:48:13,018 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 26 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-05 05:48:13,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-04-05 05:48:13,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-04-05 05:48:13,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 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) [2022-04-05 05:48:13,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2022-04-05 05:48:13,052 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 14 [2022-04-05 05:48:13,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:48:13,052 INFO L478 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2022-04-05 05:48:13,052 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 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) [2022-04-05 05:48:13,053 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2022-04-05 05:48:13,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-04-05 05:48:13,053 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:48:13,053 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:48:13,053 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-05 05:48:13,054 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:48:13,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:48:13,054 INFO L85 PathProgramCache]: Analyzing trace with hash -137167005, now seen corresponding path program 1 times [2022-04-05 05:48:13,054 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:48:13,054 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1017965142] [2022-04-05 05:48:13,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:13,055 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:48:13,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:13,171 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:48:13,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:13,190 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-05 05:48:13,191 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:48:13,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1017965142] [2022-04-05 05:48:13,191 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1017965142] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-05 05:48:13,191 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-05 05:48:13,192 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-05 05:48:13,192 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2101405914] [2022-04-05 05:48:13,192 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 05:48:13,193 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-05 05:48:13,193 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:48:13,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-05 05:48:13,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-04-05 05:48:13,195 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 4 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) [2022-04-05 05:48:13,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:48:13,280 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2022-04-05 05:48:13,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-04-05 05:48:13,281 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 4 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 [2022-04-05 05:48:13,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:48:13,282 INFO L225 Difference]: With dead ends: 22 [2022-04-05 05:48:13,282 INFO L226 Difference]: Without dead ends: 17 [2022-04-05 05:48:13,285 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2022-04-05 05:48:13,287 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 15 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-05 05:48:13,287 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 31 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-05 05:48:13,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-04-05 05:48:13,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-04-05 05:48:13,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:13,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2022-04-05 05:48:13,300 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 14 [2022-04-05 05:48:13,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:48:13,304 INFO L478 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2022-04-05 05:48:13,304 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 4 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) [2022-04-05 05:48:13,304 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2022-04-05 05:48:13,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-04-05 05:48:13,304 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:48:13,305 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:48:13,305 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-04-05 05:48:13,305 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:48:13,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:48:13,305 INFO L85 PathProgramCache]: Analyzing trace with hash 69510770, now seen corresponding path program 1 times [2022-04-05 05:48:13,305 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:48:13,306 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1310057084] [2022-04-05 05:48:13,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:13,306 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:48:13,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:13,346 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:48:13,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:13,351 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-05 05:48:13,352 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:48:13,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1310057084] [2022-04-05 05:48:13,352 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1310057084] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-05 05:48:13,352 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-05 05:48:13,352 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-04-05 05:48:13,352 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [138527313] [2022-04-05 05:48:13,352 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 05:48:13,353 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-04-05 05:48:13,353 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:48:13,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-04-05 05:48:13,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-04-05 05:48:13,354 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:13,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:48:13,382 INFO L93 Difference]: Finished difference Result 30 states and 37 transitions. [2022-04-05 05:48:13,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-04-05 05:48:13,383 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-04-05 05:48:13,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:48:13,384 INFO L225 Difference]: With dead ends: 30 [2022-04-05 05:48:13,385 INFO L226 Difference]: Without dead ends: 23 [2022-04-05 05:48:13,385 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 [2022-04-05 05:48:13,386 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 18 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-05 05:48:13,386 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 21 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-05 05:48:13,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-04-05 05:48:13,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2022-04-05 05:48:13,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 17 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:13,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2022-04-05 05:48:13,390 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 15 [2022-04-05 05:48:13,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:48:13,391 INFO L478 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2022-04-05 05:48:13,391 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:13,391 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2022-04-05 05:48:13,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-04-05 05:48:13,391 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:48:13,391 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:48:13,392 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-04-05 05:48:13,392 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:48:13,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:48:13,392 INFO L85 PathProgramCache]: Analyzing trace with hash 842497847, now seen corresponding path program 1 times [2022-04-05 05:48:13,392 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:48:13,392 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [587600507] [2022-04-05 05:48:13,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:13,393 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:48:13,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:13,422 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:48:13,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:13,427 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-05 05:48:13,427 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:48:13,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [587600507] [2022-04-05 05:48:13,428 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [587600507] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-05 05:48:13,428 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-05 05:48:13,428 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-05 05:48:13,428 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [871102145] [2022-04-05 05:48:13,428 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 05:48:13,428 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-05 05:48:13,429 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:48:13,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-05 05:48:13,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-05 05:48:13,429 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:13,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:48:13,461 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2022-04-05 05:48:13,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-05 05:48:13,461 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-04-05 05:48:13,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:48:13,461 INFO L225 Difference]: With dead ends: 27 [2022-04-05 05:48:13,462 INFO L226 Difference]: Without dead ends: 18 [2022-04-05 05:48:13,462 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-04-05 05:48:13,463 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 14 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-05 05:48:13,463 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 27 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-05 05:48:13,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-04-05 05:48:13,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-04-05 05:48:13,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:13,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2022-04-05 05:48:13,467 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 15 [2022-04-05 05:48:13,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:48:13,467 INFO L478 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2022-04-05 05:48:13,468 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:13,468 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2022-04-05 05:48:13,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-04-05 05:48:13,468 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:48:13,468 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:48:13,468 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-04-05 05:48:13,468 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:48:13,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:48:13,469 INFO L85 PathProgramCache]: Analyzing trace with hash -1435685474, now seen corresponding path program 1 times [2022-04-05 05:48:13,469 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:48:13,469 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [271522708] [2022-04-05 05:48:13,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:13,469 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:48:13,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:13,526 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:48:13,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:13,530 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-05 05:48:13,530 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:48:13,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [271522708] [2022-04-05 05:48:13,531 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [271522708] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:48:13,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [840562637] [2022-04-05 05:48:13,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:13,531 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:13,531 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:48:13,532 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) [2022-04-05 05:48:13,533 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-04-05 05:48:13,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:13,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 8 conjunts are in the unsatisfiable core [2022-04-05 05:48:13,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:48:13,662 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-05 05:48:13,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:48:13,741 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-05 05:48:13,742 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [840562637] provided 1 perfect and 1 imperfect interpolant sequences [2022-04-05 05:48:13,742 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-04-05 05:48:13,743 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6, 5] total 9 [2022-04-05 05:48:13,743 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256673291] [2022-04-05 05:48:13,743 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 05:48:13,744 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-04-05 05:48:13,744 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:48:13,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-04-05 05:48:13,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2022-04-05 05:48:13,746 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:13,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:48:13,767 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2022-04-05 05:48:13,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-04-05 05:48:13,767 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 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 16 [2022-04-05 05:48:13,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:48:13,768 INFO L225 Difference]: With dead ends: 24 [2022-04-05 05:48:13,768 INFO L226 Difference]: Without dead ends: 17 [2022-04-05 05:48:13,769 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2022-04-05 05:48:13,774 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 1 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-05 05:48:13,774 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 35 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-05 05:48:13,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-04-05 05:48:13,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-04-05 05:48:13,777 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) [2022-04-05 05:48:13,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2022-04-05 05:48:13,777 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 16 [2022-04-05 05:48:13,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:48:13,777 INFO L478 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2022-04-05 05:48:13,777 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:13,777 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2022-04-05 05:48:13,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-04-05 05:48:13,778 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:48:13,778 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:48:13,797 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-04-05 05:48:13,978 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:13,979 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:48:13,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:48:13,979 INFO L85 PathProgramCache]: Analyzing trace with hash -662698397, now seen corresponding path program 1 times [2022-04-05 05:48:13,980 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:48:13,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [955298365] [2022-04-05 05:48:13,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:13,980 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:48:14,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:14,059 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:48:14,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:14,068 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-05 05:48:14,068 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:48:14,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [955298365] [2022-04-05 05:48:14,068 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [955298365] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:48:14,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [198256399] [2022-04-05 05:48:14,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:14,069 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:14,069 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:48:14,070 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) [2022-04-05 05:48:14,071 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-04-05 05:48:14,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:14,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 8 conjunts are in the unsatisfiable core [2022-04-05 05:48:14,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:48:14,168 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-05 05:48:14,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:48:14,218 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-05 05:48:14,218 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [198256399] provided 1 perfect and 1 imperfect interpolant sequences [2022-04-05 05:48:14,218 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-04-05 05:48:14,218 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5, 5] total 9 [2022-04-05 05:48:14,218 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488768205] [2022-04-05 05:48:14,218 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 05:48:14,219 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-04-05 05:48:14,219 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:48:14,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-04-05 05:48:14,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2022-04-05 05:48:14,219 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:14,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:48:14,234 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2022-04-05 05:48:14,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-04-05 05:48:14,234 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 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 16 [2022-04-05 05:48:14,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:48:14,235 INFO L225 Difference]: With dead ends: 23 [2022-04-05 05:48:14,235 INFO L226 Difference]: Without dead ends: 18 [2022-04-05 05:48:14,235 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2022-04-05 05:48:14,240 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 1 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-05 05:48:14,241 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 36 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-05 05:48:14,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-04-05 05:48:14,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-04-05 05:48:14,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:14,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2022-04-05 05:48:14,252 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 16 [2022-04-05 05:48:14,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:48:14,252 INFO L478 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2022-04-05 05:48:14,252 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:14,252 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2022-04-05 05:48:14,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-04-05 05:48:14,252 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:48:14,252 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:48:14,287 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-04-05 05:48:14,453 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-04-05 05:48:14,453 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:48:14,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:48:14,453 INFO L85 PathProgramCache]: Analyzing trace with hash 957906802, now seen corresponding path program 1 times [2022-04-05 05:48:14,454 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:48:14,454 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1595368914] [2022-04-05 05:48:14,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:14,454 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:48:14,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:14,520 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:48:14,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:14,527 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-05 05:48:14,528 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:48:14,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1595368914] [2022-04-05 05:48:14,528 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1595368914] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:48:14,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [342560749] [2022-04-05 05:48:14,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:14,528 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:14,528 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:48:14,529 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) [2022-04-05 05:48:14,530 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-04-05 05:48:14,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:14,556 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 10 conjunts are in the unsatisfiable core [2022-04-05 05:48:14,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:48:14,646 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-05 05:48:14,646 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:48:14,705 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-05 05:48:14,706 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [342560749] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:48:14,706 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:48:14,706 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 9 [2022-04-05 05:48:14,706 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851521245] [2022-04-05 05:48:14,706 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:48:14,706 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-04-05 05:48:14,706 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:48:14,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-04-05 05:48:14,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2022-04-05 05:48:14,710 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:14,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:48:14,786 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2022-04-05 05:48:14,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-04-05 05:48:14,786 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-04-05 05:48:14,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:48:14,787 INFO L225 Difference]: With dead ends: 26 [2022-04-05 05:48:14,787 INFO L226 Difference]: Without dead ends: 21 [2022-04-05 05:48:14,788 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 32 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2022-04-05 05:48:14,789 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 16 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-05 05:48:14,789 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 36 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-05 05:48:14,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-04-05 05:48:14,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2022-04-05 05:48:14,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 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) [2022-04-05 05:48:14,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2022-04-05 05:48:14,798 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 17 [2022-04-05 05:48:14,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:48:14,798 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2022-04-05 05:48:14,799 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:14,799 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2022-04-05 05:48:14,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-04-05 05:48:14,799 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:48:14,799 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:48:14,826 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-04-05 05:48:15,007 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:15,008 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:48:15,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:48:15,008 INFO L85 PathProgramCache]: Analyzing trace with hash -342939581, now seen corresponding path program 2 times [2022-04-05 05:48:15,008 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:48:15,008 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1422538040] [2022-04-05 05:48:15,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:15,008 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:48:15,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:15,088 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:48:15,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:15,092 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-05 05:48:15,092 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:48:15,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1422538040] [2022-04-05 05:48:15,092 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1422538040] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:48:15,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2059957966] [2022-04-05 05:48:15,092 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-05 05:48:15,092 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:15,092 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:48:15,093 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) [2022-04-05 05:48:15,094 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-04-05 05:48:15,122 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-05 05:48:15,122 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 05:48:15,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 12 conjunts are in the unsatisfiable core [2022-04-05 05:48:15,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:48:15,184 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-05 05:48:15,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:48:15,255 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-05 05:48:15,255 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2059957966] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:48:15,255 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:48:15,255 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 6] total 11 [2022-04-05 05:48:15,255 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1211370043] [2022-04-05 05:48:15,256 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:48:15,256 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-04-05 05:48:15,256 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:48:15,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-04-05 05:48:15,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2022-04-05 05:48:15,256 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 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) [2022-04-05 05:48:15,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:48:15,389 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2022-04-05 05:48:15,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-04-05 05:48:15,389 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 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 18 [2022-04-05 05:48:15,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:48:15,389 INFO L225 Difference]: With dead ends: 35 [2022-04-05 05:48:15,390 INFO L226 Difference]: Without dead ends: 20 [2022-04-05 05:48:15,390 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 30 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=102, Invalid=278, Unknown=0, NotChecked=0, Total=380 [2022-04-05 05:48:15,390 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 21 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-05 05:48:15,391 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 34 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-05 05:48:15,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-04-05 05:48:15,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-04-05 05:48:15,393 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) [2022-04-05 05:48:15,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2022-04-05 05:48:15,393 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2022-04-05 05:48:15,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:48:15,394 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2022-04-05 05:48:15,394 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 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) [2022-04-05 05:48:15,394 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2022-04-05 05:48:15,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-04-05 05:48:15,394 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:48:15,394 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:48:15,420 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-04-05 05:48:15,595 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:15,595 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:48:15,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:48:15,595 INFO L85 PathProgramCache]: Analyzing trace with hash 302088562, now seen corresponding path program 3 times [2022-04-05 05:48:15,595 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:48:15,595 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1965761259] [2022-04-05 05:48:15,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:15,596 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:48:15,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:15,647 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:48:15,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:15,651 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-04-05 05:48:15,652 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:48:15,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1965761259] [2022-04-05 05:48:15,652 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1965761259] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:48:15,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [881867729] [2022-04-05 05:48:15,652 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-04-05 05:48:15,652 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:15,652 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:48:15,653 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) [2022-04-05 05:48:15,655 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-04-05 05:48:15,683 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-04-05 05:48:15,684 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 05:48:15,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 14 conjunts are in the unsatisfiable core [2022-04-05 05:48:15,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:48:15,758 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-05 05:48:15,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:48:15,822 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-04-05 05:48:15,822 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [881867729] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:48:15,822 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:48:15,822 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 6] total 13 [2022-04-05 05:48:15,822 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229398952] [2022-04-05 05:48:15,822 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:48:15,823 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-04-05 05:48:15,823 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:48:15,823 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-04-05 05:48:15,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2022-04-05 05:48:15,823 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 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) [2022-04-05 05:48:16,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:48:16,026 INFO L93 Difference]: Finished difference Result 47 states and 58 transitions. [2022-04-05 05:48:16,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-04-05 05:48:16,027 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 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 [2022-04-05 05:48:16,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:48:16,028 INFO L225 Difference]: With dead ends: 47 [2022-04-05 05:48:16,028 INFO L226 Difference]: Without dead ends: 41 [2022-04-05 05:48:16,028 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=154, Invalid=398, Unknown=0, NotChecked=0, Total=552 [2022-04-05 05:48:16,029 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 50 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-05 05:48:16,029 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 34 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-05 05:48:16,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-04-05 05:48:16,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 29. [2022-04-05 05:48:16,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 24 states have internal predecessors, (29), 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) [2022-04-05 05:48:16,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2022-04-05 05:48:16,033 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 19 [2022-04-05 05:48:16,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:48:16,034 INFO L478 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2022-04-05 05:48:16,034 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 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) [2022-04-05 05:48:16,034 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2022-04-05 05:48:16,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-04-05 05:48:16,034 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:48:16,034 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:48:16,053 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-04-05 05:48:16,253 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:16,253 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:48:16,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:48:16,254 INFO L85 PathProgramCache]: Analyzing trace with hash 801531459, now seen corresponding path program 4 times [2022-04-05 05:48:16,254 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:48:16,254 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1957925191] [2022-04-05 05:48:16,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:16,254 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:48:16,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:16,313 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:48:16,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:16,317 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-04-05 05:48:16,317 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:48:16,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1957925191] [2022-04-05 05:48:16,317 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1957925191] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:48:16,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [777349635] [2022-04-05 05:48:16,317 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-05 05:48:16,317 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:16,317 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:48:16,319 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) [2022-04-05 05:48:16,320 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-04-05 05:48:16,347 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-05 05:48:16,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 05:48:16,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 12 conjunts are in the unsatisfiable core [2022-04-05 05:48:16,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:48:16,412 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-04-05 05:48:16,412 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:48:16,465 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-04-05 05:48:16,465 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [777349635] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:48:16,465 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:48:16,465 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 10 [2022-04-05 05:48:16,465 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604954492] [2022-04-05 05:48:16,465 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:48:16,465 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-04-05 05:48:16,466 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:48:16,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-04-05 05:48:16,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2022-04-05 05:48:16,466 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 10 states, 10 states have (on average 1.8) internal successors, (18), 7 states have internal predecessors, (18), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:16,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:48:16,559 INFO L93 Difference]: Finished difference Result 42 states and 48 transitions. [2022-04-05 05:48:16,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-05 05:48:16,559 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 7 states have internal predecessors, (18), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2022-04-05 05:48:16,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:48:16,559 INFO L225 Difference]: With dead ends: 42 [2022-04-05 05:48:16,560 INFO L226 Difference]: Without dead ends: 34 [2022-04-05 05:48:16,560 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 39 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2022-04-05 05:48:16,560 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 16 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-05 05:48:16,560 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 41 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-05 05:48:16,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-04-05 05:48:16,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2022-04-05 05:48:16,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.2222222222222223) internal successors, (33), 27 states have internal predecessors, (33), 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) [2022-04-05 05:48:16,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 37 transitions. [2022-04-05 05:48:16,565 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 37 transitions. Word has length 20 [2022-04-05 05:48:16,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:48:16,565 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 37 transitions. [2022-04-05 05:48:16,566 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 7 states have internal predecessors, (18), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:16,566 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 37 transitions. [2022-04-05 05:48:16,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-04-05 05:48:16,566 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:48:16,566 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:48:16,585 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-04-05 05:48:16,779 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:16,779 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:48:16,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:48:16,780 INFO L85 PathProgramCache]: Analyzing trace with hash -1084369129, now seen corresponding path program 5 times [2022-04-05 05:48:16,780 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:48:16,780 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [451401045] [2022-04-05 05:48:16,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:16,780 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:48:16,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:16,840 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:48:16,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:16,846 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-04-05 05:48:16,846 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:48:16,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [451401045] [2022-04-05 05:48:16,846 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [451401045] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:48:16,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1545444919] [2022-04-05 05:48:16,846 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-04-05 05:48:16,847 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:16,847 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:48:16,847 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) [2022-04-05 05:48:16,848 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-04-05 05:48:16,880 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2022-04-05 05:48:16,880 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 05:48:16,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 18 conjunts are in the unsatisfiable core [2022-04-05 05:48:16,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:48:16,955 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-04-05 05:48:16,956 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:48:17,087 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-04-05 05:48:17,088 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1545444919] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:48:17,088 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:48:17,088 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 18 [2022-04-05 05:48:17,088 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757223219] [2022-04-05 05:48:17,088 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:48:17,088 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-04-05 05:48:17,088 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:48:17,089 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-04-05 05:48:17,089 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2022-04-05 05:48:17,089 INFO L87 Difference]: Start difference. First operand 32 states and 37 transitions. Second operand has 18 states, 18 states have (on average 1.7777777777777777) internal successors, (32), 17 states have internal predecessors, (32), 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) [2022-04-05 05:48:17,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:48:17,367 INFO L93 Difference]: Finished difference Result 66 states and 79 transitions. [2022-04-05 05:48:17,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-04-05 05:48:17,367 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.7777777777777777) internal successors, (32), 17 states have internal predecessors, (32), 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 21 [2022-04-05 05:48:17,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:48:17,368 INFO L225 Difference]: With dead ends: 66 [2022-04-05 05:48:17,368 INFO L226 Difference]: Without dead ends: 53 [2022-04-05 05:48:17,369 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=213, Invalid=843, Unknown=0, NotChecked=0, Total=1056 [2022-04-05 05:48:17,369 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 65 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 145 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 190 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 145 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-05 05:48:17,369 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 52 Invalid, 190 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 145 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-05 05:48:17,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-04-05 05:48:17,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 23. [2022-04-05 05:48:17,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 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) [2022-04-05 05:48:17,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2022-04-05 05:48:17,374 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 21 [2022-04-05 05:48:17,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:48:17,374 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2022-04-05 05:48:17,374 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.7777777777777777) internal successors, (32), 17 states have internal predecessors, (32), 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) [2022-04-05 05:48:17,374 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2022-04-05 05:48:17,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-04-05 05:48:17,374 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:48:17,374 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:48:17,397 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-04-05 05:48:17,585 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:17,586 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:48:17,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:48:17,586 INFO L85 PathProgramCache]: Analyzing trace with hash 465015230, now seen corresponding path program 6 times [2022-04-05 05:48:17,586 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:48:17,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [702226671] [2022-04-05 05:48:17,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:17,587 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:48:17,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:17,653 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:48:17,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:17,656 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-04-05 05:48:17,656 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:48:17,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [702226671] [2022-04-05 05:48:17,656 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [702226671] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:48:17,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1569459357] [2022-04-05 05:48:17,656 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-05 05:48:17,656 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:17,656 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:48:17,657 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) [2022-04-05 05:48:17,658 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-04-05 05:48:17,692 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-04-05 05:48:17,692 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 05:48:17,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 20 conjunts are in the unsatisfiable core [2022-04-05 05:48:17,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:48:17,762 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-04-05 05:48:17,762 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:48:17,865 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-04-05 05:48:17,866 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1569459357] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:48:17,866 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:48:17,866 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 8] total 19 [2022-04-05 05:48:17,866 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321657327] [2022-04-05 05:48:17,866 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:48:17,866 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-04-05 05:48:17,866 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:48:17,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-04-05 05:48:17,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2022-04-05 05:48:17,867 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 18 states have internal predecessors, (31), 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) [2022-04-05 05:48:18,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:48:18,241 INFO L93 Difference]: Finished difference Result 50 states and 60 transitions. [2022-04-05 05:48:18,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-04-05 05:48:18,242 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 18 states have internal predecessors, (31), 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 22 [2022-04-05 05:48:18,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:48:18,242 INFO L225 Difference]: With dead ends: 50 [2022-04-05 05:48:18,242 INFO L226 Difference]: Without dead ends: 38 [2022-04-05 05:48:18,243 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=205, Invalid=1055, Unknown=0, NotChecked=0, Total=1260 [2022-04-05 05:48:18,243 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 24 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 202 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-05 05:48:18,244 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 58 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 202 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-05 05:48:18,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-04-05 05:48:18,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2022-04-05 05:48:18,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.1875) internal successors, (38), 32 states have internal predecessors, (38), 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) [2022-04-05 05:48:18,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 42 transitions. [2022-04-05 05:48:18,252 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 42 transitions. Word has length 22 [2022-04-05 05:48:18,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:48:18,252 INFO L478 AbstractCegarLoop]: Abstraction has 37 states and 42 transitions. [2022-04-05 05:48:18,253 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 18 states have internal predecessors, (31), 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) [2022-04-05 05:48:18,253 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 42 transitions. [2022-04-05 05:48:18,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-04-05 05:48:18,253 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:48:18,253 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:48:18,291 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-04-05 05:48:18,460 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,SelfDestructingSolverStorable11 [2022-04-05 05:48:18,460 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:48:18,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:48:18,460 INFO L85 PathProgramCache]: Analyzing trace with hash 660626, now seen corresponding path program 7 times [2022-04-05 05:48:18,460 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:48:18,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1409419965] [2022-04-05 05:48:18,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:18,460 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:48:18,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:18,549 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:48:18,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:18,557 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-04-05 05:48:18,557 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:48:18,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1409419965] [2022-04-05 05:48:18,557 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1409419965] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:48:18,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [838145948] [2022-04-05 05:48:18,557 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-04-05 05:48:18,557 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:18,557 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:48:18,572 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) [2022-04-05 05:48:18,614 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-04-05 05:48:18,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:18,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 22 conjunts are in the unsatisfiable core [2022-04-05 05:48:18,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:48:18,742 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-04-05 05:48:18,743 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:48:18,802 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-04-05 05:48:18,803 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [838145948] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:48:18,803 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:48:18,803 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 11 [2022-04-05 05:48:18,803 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817183999] [2022-04-05 05:48:18,803 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:48:18,804 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-04-05 05:48:18,804 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:48:18,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-04-05 05:48:18,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2022-04-05 05:48:18,804 INFO L87 Difference]: Start difference. First operand 37 states and 42 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:18,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:48:18,925 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2022-04-05 05:48:18,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-04-05 05:48:18,925 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-04-05 05:48:18,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:48:18,926 INFO L225 Difference]: With dead ends: 51 [2022-04-05 05:48:18,926 INFO L226 Difference]: Without dead ends: 42 [2022-04-05 05:48:18,926 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2022-04-05 05:48:18,926 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 16 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-05 05:48:18,926 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 46 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-05 05:48:18,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-04-05 05:48:18,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 39. [2022-04-05 05:48:18,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.1764705882352942) internal successors, (40), 34 states have internal predecessors, (40), 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) [2022-04-05 05:48:18,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 44 transitions. [2022-04-05 05:48:18,933 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 44 transitions. Word has length 23 [2022-04-05 05:48:18,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:48:18,933 INFO L478 AbstractCegarLoop]: Abstraction has 39 states and 44 transitions. [2022-04-05 05:48:18,933 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:18,933 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 44 transitions. [2022-04-05 05:48:18,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-04-05 05:48:18,934 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:48:18,934 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:48:18,951 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-04-05 05:48:19,147 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-04-05 05:48:19,147 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:48:19,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:48:19,148 INFO L85 PathProgramCache]: Analyzing trace with hash -1529937545, now seen corresponding path program 8 times [2022-04-05 05:48:19,148 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:48:19,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [265297559] [2022-04-05 05:48:19,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:19,148 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:48:19,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:19,247 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:48:19,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:19,250 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-04-05 05:48:19,250 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:48:19,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [265297559] [2022-04-05 05:48:19,250 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [265297559] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:48:19,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [831307346] [2022-04-05 05:48:19,250 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-05 05:48:19,250 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:19,251 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:48:19,251 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) [2022-04-05 05:48:19,252 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-04-05 05:48:19,284 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-05 05:48:19,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 05:48:19,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 26 conjunts are in the unsatisfiable core [2022-04-05 05:48:19,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:48:19,401 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-04-05 05:48:19,401 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:48:19,561 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-04-05 05:48:19,561 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [831307346] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:48:19,562 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:48:19,562 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 10] total 24 [2022-04-05 05:48:19,562 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666497661] [2022-04-05 05:48:19,562 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:48:19,562 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-04-05 05:48:19,562 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:48:19,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-04-05 05:48:19,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=457, Unknown=0, NotChecked=0, Total=552 [2022-04-05 05:48:19,563 INFO L87 Difference]: Start difference. First operand 39 states and 44 transitions. Second operand has 24 states, 24 states have (on average 1.5) internal successors, (36), 23 states have internal predecessors, (36), 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) [2022-04-05 05:48:20,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:48:20,209 INFO L93 Difference]: Finished difference Result 69 states and 83 transitions. [2022-04-05 05:48:20,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-04-05 05:48:20,209 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.5) internal successors, (36), 23 states have internal predecessors, (36), 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 25 [2022-04-05 05:48:20,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:48:20,210 INFO L225 Difference]: With dead ends: 69 [2022-04-05 05:48:20,210 INFO L226 Difference]: Without dead ends: 55 [2022-04-05 05:48:20,211 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 468 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=347, Invalid=2005, Unknown=0, NotChecked=0, Total=2352 [2022-04-05 05:48:20,211 INFO L913 BasicCegarLoop]: 13 mSDtfsCounter, 34 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 341 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 411 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 341 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-05 05:48:20,211 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 70 Invalid, 411 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 341 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-05 05:48:20,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-04-05 05:48:20,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 50. [2022-04-05 05:48:20,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.1777777777777778) internal successors, (53), 45 states have internal predecessors, (53), 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) [2022-04-05 05:48:20,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 57 transitions. [2022-04-05 05:48:20,220 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 57 transitions. Word has length 25 [2022-04-05 05:48:20,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:48:20,220 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 57 transitions. [2022-04-05 05:48:20,220 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.5) internal successors, (36), 23 states have internal predecessors, (36), 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) [2022-04-05 05:48:20,220 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 57 transitions. [2022-04-05 05:48:20,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-04-05 05:48:20,221 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:48:20,221 INFO L499 BasicCegarLoop]: trace histogram [6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:48:20,242 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-04-05 05:48:20,421 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,SelfDestructingSolverStorable13 [2022-04-05 05:48:20,421 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:48:20,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:48:20,422 INFO L85 PathProgramCache]: Analyzing trace with hash -575953218, now seen corresponding path program 9 times [2022-04-05 05:48:20,422 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:48:20,422 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2099482292] [2022-04-05 05:48:20,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:20,422 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:48:20,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:20,503 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:48:20,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:20,506 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-04-05 05:48:20,507 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:48:20,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2099482292] [2022-04-05 05:48:20,507 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2099482292] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:48:20,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [536679955] [2022-04-05 05:48:20,507 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-04-05 05:48:20,507 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:20,507 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:48:20,508 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) [2022-04-05 05:48:20,509 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-04-05 05:48:20,552 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-04-05 05:48:20,552 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 05:48:20,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 24 conjunts are in the unsatisfiable core [2022-04-05 05:48:20,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:48:20,666 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-04-05 05:48:20,666 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:48:20,810 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-04-05 05:48:20,810 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [536679955] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:48:20,810 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:48:20,810 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 23 [2022-04-05 05:48:20,810 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484668949] [2022-04-05 05:48:20,810 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:48:20,811 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-04-05 05:48:20,811 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:48:20,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-04-05 05:48:20,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=407, Unknown=0, NotChecked=0, Total=506 [2022-04-05 05:48:20,811 INFO L87 Difference]: Start difference. First operand 50 states and 57 transitions. Second operand has 23 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 22 states have internal predecessors, (39), 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) [2022-04-05 05:48:21,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:48:21,374 INFO L93 Difference]: Finished difference Result 85 states and 97 transitions. [2022-04-05 05:48:21,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-04-05 05:48:21,374 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 22 states have internal predecessors, (39), 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 26 [2022-04-05 05:48:21,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:48:21,375 INFO L225 Difference]: With dead ends: 85 [2022-04-05 05:48:21,375 INFO L226 Difference]: Without dead ends: 68 [2022-04-05 05:48:21,375 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 413 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=366, Invalid=1614, Unknown=0, NotChecked=0, Total=1980 [2022-04-05 05:48:21,376 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 103 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 195 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-05 05:48:21,376 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [103 Valid, 67 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 195 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-05 05:48:21,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-04-05 05:48:21,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 43. [2022-04-05 05:48:21,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.1578947368421053) internal successors, (44), 38 states have internal predecessors, (44), 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) [2022-04-05 05:48:21,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 48 transitions. [2022-04-05 05:48:21,387 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 48 transitions. Word has length 26 [2022-04-05 05:48:21,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:48:21,387 INFO L478 AbstractCegarLoop]: Abstraction has 43 states and 48 transitions. [2022-04-05 05:48:21,387 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 22 states have internal predecessors, (39), 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) [2022-04-05 05:48:21,387 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 48 transitions. [2022-04-05 05:48:21,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-04-05 05:48:21,387 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:48:21,387 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:48:21,407 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-04-05 05:48:21,603 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,SelfDestructingSolverStorable14 [2022-04-05 05:48:21,603 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:48:21,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:48:21,604 INFO L85 PathProgramCache]: Analyzing trace with hash -1167600349, now seen corresponding path program 10 times [2022-04-05 05:48:21,604 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:48:21,604 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [15537311] [2022-04-05 05:48:21,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:21,604 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:48:21,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:21,706 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:48:21,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:21,710 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-04-05 05:48:21,710 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:48:21,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [15537311] [2022-04-05 05:48:21,710 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [15537311] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:48:21,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [141522089] [2022-04-05 05:48:21,710 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-05 05:48:21,711 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:21,711 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:48:21,723 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) [2022-04-05 05:48:21,723 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-04-05 05:48:21,754 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-05 05:48:21,754 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 05:48:21,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 20 conjunts are in the unsatisfiable core [2022-04-05 05:48:21,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:48:21,821 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-04-05 05:48:21,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:48:21,882 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-04-05 05:48:21,882 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [141522089] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:48:21,882 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:48:21,882 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 12 [2022-04-05 05:48:21,882 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710671649] [2022-04-05 05:48:21,882 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:48:21,882 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-04-05 05:48:21,882 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:48:21,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-04-05 05:48:21,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2022-04-05 05:48:21,883 INFO L87 Difference]: Start difference. First operand 43 states and 48 transitions. Second operand has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:22,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:48:22,014 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2022-04-05 05:48:22,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-04-05 05:48:22,014 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2022-04-05 05:48:22,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:48:22,015 INFO L225 Difference]: With dead ends: 59 [2022-04-05 05:48:22,015 INFO L226 Difference]: Without dead ends: 49 [2022-04-05 05:48:22,015 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 53 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2022-04-05 05:48:22,016 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 15 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-05 05:48:22,016 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 56 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 162 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-05 05:48:22,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-04-05 05:48:22,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 45. [2022-04-05 05:48:22,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.15) internal successors, (46), 40 states have internal predecessors, (46), 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) [2022-04-05 05:48:22,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 50 transitions. [2022-04-05 05:48:22,023 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 50 transitions. Word has length 26 [2022-04-05 05:48:22,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:48:22,023 INFO L478 AbstractCegarLoop]: Abstraction has 45 states and 50 transitions. [2022-04-05 05:48:22,024 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:22,024 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 50 transitions. [2022-04-05 05:48:22,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-04-05 05:48:22,024 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:48:22,024 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:48:22,040 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-04-05 05:48:22,240 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-04-05 05:48:22,240 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:48:22,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:48:22,241 INFO L85 PathProgramCache]: Analyzing trace with hash 627420638, now seen corresponding path program 11 times [2022-04-05 05:48:22,241 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:48:22,241 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [785534249] [2022-04-05 05:48:22,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:22,241 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:48:22,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:22,355 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:48:22,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:22,374 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-04-05 05:48:22,374 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:48:22,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [785534249] [2022-04-05 05:48:22,374 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [785534249] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:48:22,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [367589698] [2022-04-05 05:48:22,374 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-04-05 05:48:22,375 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:22,375 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:48:22,375 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 05:48:22,376 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-04-05 05:48:22,470 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2022-04-05 05:48:22,471 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 05:48:22,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 32 conjunts are in the unsatisfiable core [2022-04-05 05:48:22,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:48:22,608 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-04-05 05:48:22,608 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:48:22,837 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-04-05 05:48:22,837 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [367589698] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:48:22,837 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:48:22,838 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 12] total 29 [2022-04-05 05:48:22,838 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2079175286] [2022-04-05 05:48:22,838 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:48:22,838 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-04-05 05:48:22,838 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:48:22,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-04-05 05:48:22,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=685, Unknown=0, NotChecked=0, Total=812 [2022-04-05 05:48:22,839 INFO L87 Difference]: Start difference. First operand 45 states and 50 transitions. Second operand has 29 states, 29 states have (on average 1.4137931034482758) internal successors, (41), 28 states have internal predecessors, (41), 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) [2022-04-05 05:48:23,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:48:23,880 INFO L93 Difference]: Finished difference Result 80 states and 95 transitions. [2022-04-05 05:48:23,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-04-05 05:48:23,880 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.4137931034482758) internal successors, (41), 28 states have internal predecessors, (41), 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 28 [2022-04-05 05:48:23,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:48:23,881 INFO L225 Difference]: With dead ends: 80 [2022-04-05 05:48:23,881 INFO L226 Difference]: Without dead ends: 64 [2022-04-05 05:48:23,889 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 731 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=473, Invalid=3067, Unknown=0, NotChecked=0, Total=3540 [2022-04-05 05:48:23,889 INFO L913 BasicCegarLoop]: 13 mSDtfsCounter, 39 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 459 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 546 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 459 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-05 05:48:23,890 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 75 Invalid, 546 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 459 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-05 05:48:23,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-04-05 05:48:23,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 58. [2022-04-05 05:48:23,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.150943396226415) internal successors, (61), 53 states have internal predecessors, (61), 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) [2022-04-05 05:48:23,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 65 transitions. [2022-04-05 05:48:23,901 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 65 transitions. Word has length 28 [2022-04-05 05:48:23,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:48:23,901 INFO L478 AbstractCegarLoop]: Abstraction has 58 states and 65 transitions. [2022-04-05 05:48:23,902 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.4137931034482758) internal successors, (41), 28 states have internal predecessors, (41), 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) [2022-04-05 05:48:23,902 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 65 transitions. [2022-04-05 05:48:23,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-04-05 05:48:23,902 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:48:23,902 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:48:23,906 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-04-05 05:48:24,103 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-04-05 05:48:24,103 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:48:24,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:48:24,103 INFO L85 PathProgramCache]: Analyzing trace with hash 1023844786, now seen corresponding path program 12 times [2022-04-05 05:48:24,104 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:48:24,104 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [307079029] [2022-04-05 05:48:24,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:24,104 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:48:24,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:24,214 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:48:24,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:24,217 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-04-05 05:48:24,217 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:48:24,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [307079029] [2022-04-05 05:48:24,217 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [307079029] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:48:24,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1937160081] [2022-04-05 05:48:24,217 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-05 05:48:24,217 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:24,217 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:48:24,218 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 05:48:24,218 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-04-05 05:48:24,251 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-04-05 05:48:24,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 05:48:24,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 24 conjunts are in the unsatisfiable core [2022-04-05 05:48:24,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:48:24,350 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-04-05 05:48:24,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:48:24,436 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-04-05 05:48:24,436 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1937160081] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:48:24,436 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:48:24,436 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 13 [2022-04-05 05:48:24,436 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548092960] [2022-04-05 05:48:24,438 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:48:24,438 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-04-05 05:48:24,438 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:48:24,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-04-05 05:48:24,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2022-04-05 05:48:24,438 INFO L87 Difference]: Start difference. First operand 58 states and 65 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:24,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:48:24,615 INFO L93 Difference]: Finished difference Result 77 states and 86 transitions. [2022-04-05 05:48:24,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-04-05 05:48:24,616 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2022-04-05 05:48:24,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:48:24,616 INFO L225 Difference]: With dead ends: 77 [2022-04-05 05:48:24,616 INFO L226 Difference]: Without dead ends: 66 [2022-04-05 05:48:24,617 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 60 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=62, Invalid=358, Unknown=0, NotChecked=0, Total=420 [2022-04-05 05:48:24,617 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 18 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 191 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 191 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-05 05:48:24,617 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 58 Invalid, 203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 191 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-05 05:48:24,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-04-05 05:48:24,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2022-04-05 05:48:24,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 59 states have (on average 1.152542372881356) internal successors, (68), 59 states have internal predecessors, (68), 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) [2022-04-05 05:48:24,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 72 transitions. [2022-04-05 05:48:24,628 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 72 transitions. Word has length 29 [2022-04-05 05:48:24,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:48:24,628 INFO L478 AbstractCegarLoop]: Abstraction has 64 states and 72 transitions. [2022-04-05 05:48:24,628 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:24,629 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 72 transitions. [2022-04-05 05:48:24,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-04-05 05:48:24,629 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:48:24,629 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:48:24,646 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-04-05 05:48:24,843 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:24,843 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:48:24,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:48:24,844 INFO L85 PathProgramCache]: Analyzing trace with hash 2135825527, now seen corresponding path program 13 times [2022-04-05 05:48:24,844 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:48:24,844 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [238992393] [2022-04-05 05:48:24,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:24,844 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:48:24,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:24,978 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:48:24,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:24,982 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-04-05 05:48:24,983 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:48:24,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [238992393] [2022-04-05 05:48:24,983 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [238992393] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:48:24,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [327281307] [2022-04-05 05:48:24,983 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-04-05 05:48:24,983 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:24,983 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:48:24,984 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 05:48:24,985 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-04-05 05:48:25,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:25,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 34 conjunts are in the unsatisfiable core [2022-04-05 05:48:25,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:48:25,177 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-05 05:48:25,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:48:25,390 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-04-05 05:48:25,391 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [327281307] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:48:25,391 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:48:25,391 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 12] total 31 [2022-04-05 05:48:25,391 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476111919] [2022-04-05 05:48:25,391 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:48:25,391 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-04-05 05:48:25,391 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:48:25,392 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-04-05 05:48:25,392 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=733, Unknown=0, NotChecked=0, Total=930 [2022-04-05 05:48:25,392 INFO L87 Difference]: Start difference. First operand 64 states and 72 transitions. Second operand has 31 states, 31 states have (on average 1.6129032258064515) internal successors, (50), 30 states have internal predecessors, (50), 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) [2022-04-05 05:48:26,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:48:26,569 INFO L93 Difference]: Finished difference Result 163 states and 192 transitions. [2022-04-05 05:48:26,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-04-05 05:48:26,569 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.6129032258064515) internal successors, (50), 30 states have internal predecessors, (50), 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 29 [2022-04-05 05:48:26,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:48:26,570 INFO L225 Difference]: With dead ends: 163 [2022-04-05 05:48:26,570 INFO L226 Difference]: Without dead ends: 136 [2022-04-05 05:48:26,571 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1501 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1121, Invalid=4281, Unknown=0, NotChecked=0, Total=5402 [2022-04-05 05:48:26,572 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 183 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 474 mSolverCounterSat, 201 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 675 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 201 IncrementalHoareTripleChecker+Valid, 474 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-05 05:48:26,572 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [183 Valid, 82 Invalid, 675 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [201 Valid, 474 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-05 05:48:26,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2022-04-05 05:48:26,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 61. [2022-04-05 05:48:26,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.1428571428571428) internal successors, (64), 56 states have internal predecessors, (64), 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) [2022-04-05 05:48:26,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 68 transitions. [2022-04-05 05:48:26,583 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 68 transitions. Word has length 29 [2022-04-05 05:48:26,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:48:26,583 INFO L478 AbstractCegarLoop]: Abstraction has 61 states and 68 transitions. [2022-04-05 05:48:26,583 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.6129032258064515) internal successors, (50), 30 states have internal predecessors, (50), 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) [2022-04-05 05:48:26,583 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 68 transitions. [2022-04-05 05:48:26,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-04-05 05:48:26,584 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:48:26,584 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:48:26,605 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-04-05 05:48:26,799 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:26,799 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:48:26,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:48:26,800 INFO L85 PathProgramCache]: Analyzing trace with hash -1608168445, now seen corresponding path program 14 times [2022-04-05 05:48:26,800 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:48:26,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1925727391] [2022-04-05 05:48:26,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:26,800 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:48:26,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:26,921 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:48:26,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:26,928 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-04-05 05:48:26,928 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:48:26,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1925727391] [2022-04-05 05:48:26,929 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1925727391] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:48:26,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [455301245] [2022-04-05 05:48:26,929 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-05 05:48:26,929 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:26,929 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:48:26,930 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 05:48:26,931 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-04-05 05:48:26,961 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-05 05:48:26,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 05:48:26,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 28 conjunts are in the unsatisfiable core [2022-04-05 05:48:26,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:48:27,057 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-04-05 05:48:27,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:48:27,142 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-04-05 05:48:27,142 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [455301245] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:48:27,142 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:48:27,142 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 14 [2022-04-05 05:48:27,143 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186053901] [2022-04-05 05:48:27,143 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:48:27,143 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-04-05 05:48:27,143 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:48:27,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-04-05 05:48:27,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2022-04-05 05:48:27,143 INFO L87 Difference]: Start difference. First operand 61 states and 68 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 11 states have internal predecessors, (26), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:27,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:48:27,339 INFO L93 Difference]: Finished difference Result 88 states and 98 transitions. [2022-04-05 05:48:27,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-04-05 05:48:27,339 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 11 states have internal predecessors, (26), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2022-04-05 05:48:27,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:48:27,339 INFO L225 Difference]: With dead ends: 88 [2022-04-05 05:48:27,340 INFO L226 Difference]: Without dead ends: 76 [2022-04-05 05:48:27,340 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 67 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=68, Invalid=438, Unknown=0, NotChecked=0, Total=506 [2022-04-05 05:48:27,340 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 19 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 242 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-05 05:48:27,340 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 64 Invalid, 254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-05 05:48:27,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-04-05 05:48:27,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 69. [2022-04-05 05:48:27,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.15625) internal successors, (74), 64 states have internal predecessors, (74), 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) [2022-04-05 05:48:27,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 78 transitions. [2022-04-05 05:48:27,351 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 78 transitions. Word has length 32 [2022-04-05 05:48:27,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:48:27,352 INFO L478 AbstractCegarLoop]: Abstraction has 69 states and 78 transitions. [2022-04-05 05:48:27,352 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 11 states have internal predecessors, (26), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:27,352 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 78 transitions. [2022-04-05 05:48:27,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-04-05 05:48:27,352 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:48:27,352 INFO L499 BasicCegarLoop]: trace histogram [7, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:48:27,368 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-04-05 05:48:27,567 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:27,567 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:48:27,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:48:27,568 INFO L85 PathProgramCache]: Analyzing trace with hash -1631799165, now seen corresponding path program 15 times [2022-04-05 05:48:27,568 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:48:27,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [314917282] [2022-04-05 05:48:27,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:27,568 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:48:27,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:27,720 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:48:27,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:27,723 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 43 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-04-05 05:48:27,723 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:48:27,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [314917282] [2022-04-05 05:48:27,723 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [314917282] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:48:27,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1476427190] [2022-04-05 05:48:27,724 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-04-05 05:48:27,724 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:27,724 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:48:27,724 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 05:48:27,726 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-04-05 05:48:27,775 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-04-05 05:48:27,775 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 05:48:27,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 24 conjunts are in the unsatisfiable core [2022-04-05 05:48:27,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:48:28,031 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-04-05 05:48:28,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:48:28,244 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-04-05 05:48:28,245 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1476427190] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:48:28,245 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:48:28,245 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 14, 14] total 35 [2022-04-05 05:48:28,245 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760891632] [2022-04-05 05:48:28,245 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:48:28,245 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-04-05 05:48:28,245 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:48:28,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-04-05 05:48:28,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1065, Unknown=0, NotChecked=0, Total=1190 [2022-04-05 05:48:28,246 INFO L87 Difference]: Start difference. First operand 69 states and 78 transitions. Second operand has 35 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 34 states have internal predecessors, (47), 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) [2022-04-05 05:48:31,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:48:31,443 INFO L93 Difference]: Finished difference Result 128 states and 155 transitions. [2022-04-05 05:48:31,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-04-05 05:48:31,444 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 34 states have internal predecessors, (47), 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 32 [2022-04-05 05:48:31,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:48:31,444 INFO L225 Difference]: With dead ends: 128 [2022-04-05 05:48:31,444 INFO L226 Difference]: Without dead ends: 85 [2022-04-05 05:48:31,446 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1418 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=733, Invalid=6923, Unknown=0, NotChecked=0, Total=7656 [2022-04-05 05:48:31,447 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 37 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 1130 mSolverCounterSat, 176 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 1306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 176 IncrementalHoareTripleChecker+Valid, 1130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-04-05 05:48:31,447 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 123 Invalid, 1306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [176 Valid, 1130 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-04-05 05:48:31,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-04-05 05:48:31,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 77. [2022-04-05 05:48:31,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.1388888888888888) internal successors, (82), 72 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) [2022-04-05 05:48:31,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 86 transitions. [2022-04-05 05:48:31,465 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 86 transitions. Word has length 32 [2022-04-05 05:48:31,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:48:31,465 INFO L478 AbstractCegarLoop]: Abstraction has 77 states and 86 transitions. [2022-04-05 05:48:31,465 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 34 states have internal predecessors, (47), 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) [2022-04-05 05:48:31,465 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 86 transitions. [2022-04-05 05:48:31,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-04-05 05:48:31,465 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:48:31,466 INFO L499 BasicCegarLoop]: trace histogram [8, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:48:31,483 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-04-05 05:48:31,679 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:31,680 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:48:31,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:48:31,680 INFO L85 PathProgramCache]: Analyzing trace with hash -1125856974, now seen corresponding path program 16 times [2022-04-05 05:48:31,680 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:48:31,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [799580453] [2022-04-05 05:48:31,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:31,681 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:48:31,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:31,877 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:48:31,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:31,880 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-04-05 05:48:31,880 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:48:31,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [799580453] [2022-04-05 05:48:31,880 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [799580453] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:48:31,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1337036742] [2022-04-05 05:48:31,880 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-05 05:48:31,880 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:31,880 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:48:31,881 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 05:48:31,882 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-04-05 05:48:31,916 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-05 05:48:31,916 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 05:48:31,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 42 conjunts are in the unsatisfiable core [2022-04-05 05:48:31,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:48:32,138 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-05 05:48:32,138 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:48:32,435 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-04-05 05:48:32,435 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1337036742] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:48:32,435 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:48:32,435 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17, 14] total 37 [2022-04-05 05:48:32,435 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102394749] [2022-04-05 05:48:32,435 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:48:32,436 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-04-05 05:48:32,436 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:48:32,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-04-05 05:48:32,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=272, Invalid=1060, Unknown=0, NotChecked=0, Total=1332 [2022-04-05 05:48:32,436 INFO L87 Difference]: Start difference. First operand 77 states and 86 transitions. Second operand has 37 states, 37 states have (on average 1.5405405405405406) internal successors, (57), 36 states have internal predecessors, (57), 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) [2022-04-05 05:48:34,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:48:34,445 INFO L93 Difference]: Finished difference Result 200 states and 234 transitions. [2022-04-05 05:48:34,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-04-05 05:48:34,447 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.5405405405405406) internal successors, (57), 36 states have internal predecessors, (57), 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 33 [2022-04-05 05:48:34,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:48:34,448 INFO L225 Difference]: With dead ends: 200 [2022-04-05 05:48:34,448 INFO L226 Difference]: Without dead ends: 187 [2022-04-05 05:48:34,450 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2401 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1751, Invalid=6439, Unknown=0, NotChecked=0, Total=8190 [2022-04-05 05:48:34,450 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 277 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 734 mSolverCounterSat, 318 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 277 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 1052 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 318 IncrementalHoareTripleChecker+Valid, 734 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-04-05 05:48:34,451 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [277 Valid, 98 Invalid, 1052 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [318 Valid, 734 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-04-05 05:48:34,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2022-04-05 05:48:34,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 84. [2022-04-05 05:48:34,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 79 states have (on average 1.139240506329114) internal successors, (90), 79 states have internal predecessors, (90), 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) [2022-04-05 05:48:34,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 94 transitions. [2022-04-05 05:48:34,475 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 94 transitions. Word has length 33 [2022-04-05 05:48:34,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:48:34,475 INFO L478 AbstractCegarLoop]: Abstraction has 84 states and 94 transitions. [2022-04-05 05:48:34,475 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.5405405405405406) internal successors, (57), 36 states have internal predecessors, (57), 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) [2022-04-05 05:48:34,475 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 94 transitions. [2022-04-05 05:48:34,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-04-05 05:48:34,476 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:48:34,476 INFO L499 BasicCegarLoop]: trace histogram [7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:48:34,512 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-04-05 05:48:34,687 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:34,687 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:48:34,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:48:34,687 INFO L85 PathProgramCache]: Analyzing trace with hash -1822415150, now seen corresponding path program 17 times [2022-04-05 05:48:34,687 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:48:34,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [896836989] [2022-04-05 05:48:34,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:34,688 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:48:34,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:34,831 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:48:34,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:34,835 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-04-05 05:48:34,835 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:48:34,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [896836989] [2022-04-05 05:48:34,835 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [896836989] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:48:34,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [785035766] [2022-04-05 05:48:34,835 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-04-05 05:48:34,836 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:34,836 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:48:34,837 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 05:48:34,838 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-04-05 05:48:35,395 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2022-04-05 05:48:35,395 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 05:48:35,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 32 conjunts are in the unsatisfiable core [2022-04-05 05:48:35,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:48:35,499 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-04-05 05:48:35,499 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:48:35,602 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-04-05 05:48:35,602 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [785035766] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:48:35,602 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:48:35,602 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 15 [2022-04-05 05:48:35,603 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155518750] [2022-04-05 05:48:35,603 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:48:35,603 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-04-05 05:48:35,603 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:48:35,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-04-05 05:48:35,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2022-04-05 05:48:35,603 INFO L87 Difference]: Start difference. First operand 84 states and 94 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 12 states have internal predecessors, (28), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:35,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:48:35,856 INFO L93 Difference]: Finished difference Result 122 states and 135 transitions. [2022-04-05 05:48:35,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-04-05 05:48:35,857 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 12 states have internal predecessors, (28), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2022-04-05 05:48:35,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:48:35,857 INFO L225 Difference]: With dead ends: 122 [2022-04-05 05:48:35,857 INFO L226 Difference]: Without dead ends: 109 [2022-04-05 05:48:35,858 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 74 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=74, Invalid=526, Unknown=0, NotChecked=0, Total=600 [2022-04-05 05:48:35,858 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 19 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 318 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 318 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-05 05:48:35,858 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 74 Invalid, 332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 318 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-05 05:48:35,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2022-04-05 05:48:35,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 92. [2022-04-05 05:48:35,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 87 states have (on average 1.1379310344827587) internal successors, (99), 87 states have internal predecessors, (99), 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) [2022-04-05 05:48:35,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 103 transitions. [2022-04-05 05:48:35,875 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 103 transitions. Word has length 35 [2022-04-05 05:48:35,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:48:35,875 INFO L478 AbstractCegarLoop]: Abstraction has 92 states and 103 transitions. [2022-04-05 05:48:35,875 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 12 states have internal predecessors, (28), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:48:35,875 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 103 transitions. [2022-04-05 05:48:35,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-04-05 05:48:35,876 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:48:35,876 INFO L499 BasicCegarLoop]: trace histogram [9, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:48:35,880 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-04-05 05:48:36,076 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:36,076 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:48:36,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:48:36,077 INFO L85 PathProgramCache]: Analyzing trace with hash -807949186, now seen corresponding path program 18 times [2022-04-05 05:48:36,077 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:48:36,077 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1806357004] [2022-04-05 05:48:36,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:36,077 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:48:36,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:36,274 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:48:36,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:36,278 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-04-05 05:48:36,278 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:48:36,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1806357004] [2022-04-05 05:48:36,278 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1806357004] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:48:36,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [264172171] [2022-04-05 05:48:36,278 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-05 05:48:36,278 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:36,278 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:48:36,279 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 05:48:36,280 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-04-05 05:48:36,358 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2022-04-05 05:48:36,358 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 05:48:36,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 48 conjunts are in the unsatisfiable core [2022-04-05 05:48:36,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:48:36,583 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-04-05 05:48:36,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:48:36,971 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-04-05 05:48:36,971 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [264172171] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:48:36,971 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:48:36,971 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 16] total 41 [2022-04-05 05:48:36,971 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260127819] [2022-04-05 05:48:36,971 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:48:36,971 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-04-05 05:48:36,971 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:48:36,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-04-05 05:48:36,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=1427, Unknown=0, NotChecked=0, Total=1640 [2022-04-05 05:48:36,972 INFO L87 Difference]: Start difference. First operand 92 states and 103 transitions. Second operand has 41 states, 41 states have (on average 1.2926829268292683) internal successors, (53), 40 states have internal predecessors, (53), 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) [2022-04-05 05:48:42,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:48:42,286 INFO L93 Difference]: Finished difference Result 160 states and 191 transitions. [2022-04-05 05:48:42,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2022-04-05 05:48:42,286 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.2926829268292683) internal successors, (53), 40 states have internal predecessors, (53), 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 36 [2022-04-05 05:48:42,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:48:42,288 INFO L225 Difference]: With dead ends: 160 [2022-04-05 05:48:42,288 INFO L226 Difference]: Without dead ends: 124 [2022-04-05 05:48:42,290 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2978 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=1227, Invalid=10763, Unknown=0, NotChecked=0, Total=11990 [2022-04-05 05:48:42,291 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 44 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 1427 mSolverCounterSat, 181 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 1608 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 181 IncrementalHoareTripleChecker+Valid, 1427 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-04-05 05:48:42,291 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 130 Invalid, 1608 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [181 Valid, 1427 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-04-05 05:48:42,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-04-05 05:48:42,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 114. [2022-04-05 05:48:42,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 109 states have (on average 1.1376146788990826) internal successors, (124), 109 states have internal predecessors, (124), 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) [2022-04-05 05:48:42,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 128 transitions. [2022-04-05 05:48:42,315 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 128 transitions. Word has length 36 [2022-04-05 05:48:42,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:48:42,315 INFO L478 AbstractCegarLoop]: Abstraction has 114 states and 128 transitions. [2022-04-05 05:48:42,316 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.2926829268292683) internal successors, (53), 40 states have internal predecessors, (53), 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) [2022-04-05 05:48:42,316 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 128 transitions. [2022-04-05 05:48:42,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-04-05 05:48:42,316 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:48:42,316 INFO L499 BasicCegarLoop]: trace histogram [10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:48:42,335 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-04-05 05:48:42,530 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-04-05 05:48:42,531 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:48:42,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:48:42,531 INFO L85 PathProgramCache]: Analyzing trace with hash -625866281, now seen corresponding path program 19 times [2022-04-05 05:48:42,531 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:48:42,531 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1610546190] [2022-04-05 05:48:42,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:48:42,531 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:48:42,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:42,792 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:48:42,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:42,797 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 83 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-04-05 05:48:42,797 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:48:42,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1610546190] [2022-04-05 05:48:42,797 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1610546190] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:48:42,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [794953993] [2022-04-05 05:48:42,797 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-04-05 05:48:42,797 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:48:42,798 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:48:42,798 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 05:48:42,799 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-04-05 05:48:42,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:48:42,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 39 conjunts are in the unsatisfiable core [2022-04-05 05:48:42,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:48:42,935 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 83 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-04-05 05:48:42,935 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:48:43,392 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 83 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-04-05 05:48:43,392 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [794953993] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:48:43,393 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:48:43,393 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 42 [2022-04-05 05:48:43,393 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531408989] [2022-04-05 05:48:43,393 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:48:43,393 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-04-05 05:48:43,393 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:48:43,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-04-05 05:48:43,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=1458, Unknown=0, NotChecked=0, Total=1722 [2022-04-05 05:48:43,394 INFO L87 Difference]: Start difference. First operand 114 states and 128 transitions. Second operand has 42 states, 42 states have (on average 1.2380952380952381) internal successors, (52), 41 states have internal predecessors, (52), 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) [2022-04-05 05:49:18,081 WARN L232 SmtUtils]: Spent 14.47s on a formula simplification that was a NOOP. DAG size: 76 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 05:49:42,752 WARN L232 SmtUtils]: Spent 14.29s on a formula simplification that was a NOOP. DAG size: 73 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 05:50:01,530 WARN L232 SmtUtils]: Spent 12.44s on a formula simplification that was a NOOP. DAG size: 72 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 05:50:05,017 WARN L833 $PredicateComparison]: unable to prove that (and (< 0 (mod (+ 2 c_main_~y~0) 4294967296)) (< 0 (mod (+ 4294967295 c_main_~z~0) 4294967296)) (= |c_#NULL.base| |c_old(#NULL.base)|) (< 0 (mod (+ 4294967294 c_main_~z~0) 4294967296)) (< 0 (mod c_main_~y~0 4294967296)) (< 0 (mod (+ 4294967294 c_main_~y~0) 4294967296)) (< 0 (mod (+ 3 c_main_~y~0) 4294967296)) (< 0 (mod (+ 4294967292 c_main_~z~0) 4294967296)) (< 0 (mod (+ 4294967290 c_main_~y~0) 4294967296)) (< 0 (mod (+ 4294967292 c_main_~y~0) 4294967296)) (< 0 (mod (+ c_main_~y~0 4294967293) 4294967296)) (< 0 (mod (+ c_main_~y~0 1) 4294967296)) (< 0 (mod (+ 4294967291 c_main_~y~0) 4294967296)) (< 0 (mod (+ 4294967295 c_main_~y~0) 4294967296)) (< 0 (mod (+ 4294967289 c_main_~y~0) 4294967296)) (< 0 (mod c_main_~z~0 4294967296)) (< 0 (mod (+ 4294967293 c_main_~z~0) 4294967296)) (= |c_#NULL.offset| |c_old(#NULL.offset)|) (< 0 (mod (+ 4294967291 c_main_~z~0) 4294967296))) is different from false [2022-04-05 05:50:18,457 WARN L232 SmtUtils]: Spent 9.93s on a formula simplification that was a NOOP. DAG size: 69 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 05:50:32,697 WARN L232 SmtUtils]: Spent 9.59s on a formula simplification that was a NOOP. DAG size: 68 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 05:50:43,450 WARN L232 SmtUtils]: Spent 5.35s on a formula simplification that was a NOOP. DAG size: 66 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 05:50:54,251 WARN L232 SmtUtils]: Spent 6.22s on a formula simplification that was a NOOP. DAG size: 65 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 05:51:06,460 WARN L232 SmtUtils]: Spent 6.82s on a formula simplification that was a NOOP. DAG size: 64 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 05:53:09,530 WARN L232 SmtUtils]: Spent 10.22s on a formula simplification that was a NOOP. DAG size: 70 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 05:53:29,297 WARN L232 SmtUtils]: Spent 9.66s on a formula simplification that was a NOOP. DAG size: 71 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 05:53:40,532 WARN L232 SmtUtils]: Spent 7.92s on a formula simplification that was a NOOP. DAG size: 66 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 05:53:56,425 WARN L232 SmtUtils]: Spent 6.07s on a formula simplification that was a NOOP. DAG size: 68 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 05:54:05,226 WARN L232 SmtUtils]: Spent 5.22s on a formula simplification that was a NOOP. DAG size: 67 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 05:55:00,509 WARN L232 SmtUtils]: Spent 5.14s on a formula simplification that was a NOOP. DAG size: 72 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 05:55:43,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:55:43,194 INFO L93 Difference]: Finished difference Result 339 states and 409 transitions. [2022-04-05 05:55:43,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 239 states. [2022-04-05 05:55:43,195 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.2380952380952381) internal successors, (52), 41 states have internal predecessors, (52), 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 37 [2022-04-05 05:55:43,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:55:43,196 INFO L225 Difference]: With dead ends: 339 [2022-04-05 05:55:43,196 INFO L226 Difference]: Without dead ends: 310 [2022-04-05 05:55:43,203 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 276 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 28597 ImplicationChecksByTransitivity, 415.4s TimeCoverageRelationStatistics Valid=11161, Invalid=65291, Unknown=4, NotChecked=550, Total=77006 [2022-04-05 05:55:43,203 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 394 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 1281 mSolverCounterSat, 1166 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 394 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 2448 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1166 IncrementalHoareTripleChecker+Valid, 1281 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2022-04-05 05:55:43,203 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [394 Valid, 119 Invalid, 2448 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1166 Valid, 1281 Invalid, 0 Unknown, 1 Unchecked, 4.7s Time] [2022-04-05 05:55:43,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2022-04-05 05:55:43,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 180. [2022-04-05 05:55:43,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 175 states have (on average 1.177142857142857) internal successors, (206), 175 states have internal predecessors, (206), 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) [2022-04-05 05:55:43,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 210 transitions. [2022-04-05 05:55:43,250 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 210 transitions. Word has length 37 [2022-04-05 05:55:43,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:55:43,251 INFO L478 AbstractCegarLoop]: Abstraction has 180 states and 210 transitions. [2022-04-05 05:55:43,251 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.2380952380952381) internal successors, (52), 41 states have internal predecessors, (52), 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) [2022-04-05 05:55:43,251 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 210 transitions. [2022-04-05 05:55:43,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-04-05 05:55:43,251 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:55:43,251 INFO L499 BasicCegarLoop]: trace histogram [12, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:55:43,267 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-04-05 05:55:43,453 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-04-05 05:55:43,453 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:55:43,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:55:43,454 INFO L85 PathProgramCache]: Analyzing trace with hash -1368491133, now seen corresponding path program 20 times [2022-04-05 05:55:43,454 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:55:43,454 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1887009012] [2022-04-05 05:55:43,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:55:43,454 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:55:43,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:55:43,620 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:55:43,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:55:43,624 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 42 proven. 42 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-04-05 05:55:43,624 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:55:43,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1887009012] [2022-04-05 05:55:43,624 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1887009012] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:55:43,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [461825797] [2022-04-05 05:55:43,624 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-05 05:55:43,624 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:55:43,624 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:55:43,625 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 05:55:43,626 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-04-05 05:55:43,665 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-05 05:55:43,665 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 05:55:43,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 42 conjunts are in the unsatisfiable core [2022-04-05 05:55:43,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:55:43,874 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 42 proven. 42 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-04-05 05:55:43,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:55:44,227 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 42 proven. 42 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-04-05 05:55:44,227 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [461825797] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:55:44,227 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:55:44,227 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 38 [2022-04-05 05:55:44,227 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1280632816] [2022-04-05 05:55:44,227 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:55:44,227 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-04-05 05:55:44,227 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:55:44,228 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-04-05 05:55:44,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=1172, Unknown=0, NotChecked=0, Total=1406 [2022-04-05 05:55:44,228 INFO L87 Difference]: Start difference. First operand 180 states and 210 transitions. Second operand has 38 states, 38 states have (on average 1.4210526315789473) internal successors, (54), 37 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) [2022-04-05 05:55:47,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:55:47,005 INFO L93 Difference]: Finished difference Result 251 states and 283 transitions. [2022-04-05 05:55:47,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-04-05 05:55:47,005 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.4210526315789473) internal successors, (54), 37 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 38 [2022-04-05 05:55:47,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:55:47,006 INFO L225 Difference]: With dead ends: 251 [2022-04-05 05:55:47,006 INFO L226 Difference]: Without dead ends: 225 [2022-04-05 05:55:47,007 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1912 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1228, Invalid=6254, Unknown=0, NotChecked=0, Total=7482 [2022-04-05 05:55:47,007 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 218 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 508 mSolverCounterSat, 214 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 722 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 214 IncrementalHoareTripleChecker+Valid, 508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-04-05 05:55:47,007 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [218 Valid, 108 Invalid, 722 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [214 Valid, 508 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-04-05 05:55:47,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2022-04-05 05:55:47,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 149. [2022-04-05 05:55:47,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 144 states have (on average 1.1875) internal successors, (171), 144 states have internal predecessors, (171), 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) [2022-04-05 05:55:47,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 175 transitions. [2022-04-05 05:55:47,054 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 175 transitions. Word has length 38 [2022-04-05 05:55:47,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:55:47,055 INFO L478 AbstractCegarLoop]: Abstraction has 149 states and 175 transitions. [2022-04-05 05:55:47,055 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.4210526315789473) internal successors, (54), 37 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) [2022-04-05 05:55:47,055 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 175 transitions. [2022-04-05 05:55:47,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-04-05 05:55:47,055 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:55:47,055 INFO L499 BasicCegarLoop]: trace histogram [8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:55:47,071 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-04-05 05:55:47,259 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-04-05 05:55:47,259 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:55:47,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:55:47,260 INFO L85 PathProgramCache]: Analyzing trace with hash 1777126115, now seen corresponding path program 21 times [2022-04-05 05:55:47,260 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:55:47,260 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [474699650] [2022-04-05 05:55:47,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:55:47,260 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:55:47,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:55:47,416 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:55:47,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:55:47,419 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-04-05 05:55:47,419 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:55:47,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [474699650] [2022-04-05 05:55:47,420 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [474699650] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:55:47,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [155385595] [2022-04-05 05:55:47,420 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-04-05 05:55:47,420 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:55:47,420 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:55:47,421 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 05:55:47,421 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-04-05 05:55:47,554 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-04-05 05:55:47,554 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 05:55:47,556 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 52 conjunts are in the unsatisfiable core [2022-04-05 05:55:47,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:55:47,655 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-04-05 05:55:47,655 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:55:47,728 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-04-05 05:55:47,728 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [155385595] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:55:47,728 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:55:47,728 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 16 [2022-04-05 05:55:47,728 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932248221] [2022-04-05 05:55:47,728 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:55:47,728 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-04-05 05:55:47,729 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:55:47,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-04-05 05:55:47,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2022-04-05 05:55:47,729 INFO L87 Difference]: Start difference. First operand 149 states and 175 transitions. Second operand has 16 states, 16 states have (on average 1.875) internal successors, (30), 13 states have internal predecessors, (30), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:55:48,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:55:48,043 INFO L93 Difference]: Finished difference Result 191 states and 220 transitions. [2022-04-05 05:55:48,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-04-05 05:55:48,044 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.875) internal successors, (30), 13 states have internal predecessors, (30), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2022-04-05 05:55:48,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:55:48,044 INFO L225 Difference]: With dead ends: 191 [2022-04-05 05:55:48,044 INFO L226 Difference]: Without dead ends: 177 [2022-04-05 05:55:48,045 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 81 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=80, Invalid=622, Unknown=0, NotChecked=0, Total=702 [2022-04-05 05:55:48,045 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 19 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 370 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 386 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 370 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-05 05:55:48,045 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 79 Invalid, 386 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 370 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-05 05:55:48,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2022-04-05 05:55:48,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 160. [2022-04-05 05:55:48,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 155 states have (on average 1.1870967741935483) internal successors, (184), 155 states have internal predecessors, (184), 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) [2022-04-05 05:55:48,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 188 transitions. [2022-04-05 05:55:48,088 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 188 transitions. Word has length 38 [2022-04-05 05:55:48,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:55:48,088 INFO L478 AbstractCegarLoop]: Abstraction has 160 states and 188 transitions. [2022-04-05 05:55:48,088 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.875) internal successors, (30), 13 states have internal predecessors, (30), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:55:48,088 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 188 transitions. [2022-04-05 05:55:48,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-04-05 05:55:48,089 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:55:48,089 INFO L499 BasicCegarLoop]: trace histogram [11, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:55:48,107 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-04-05 05:55:48,293 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:55:48,294 INFO L403 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:55:48,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:55:48,294 INFO L85 PathProgramCache]: Analyzing trace with hash -800026242, now seen corresponding path program 22 times [2022-04-05 05:55:48,294 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:55:48,294 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1508677997] [2022-04-05 05:55:48,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:55:48,294 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:55:48,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:55:48,555 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:55:48,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:55:48,558 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-04-05 05:55:48,558 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:55:48,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1508677997] [2022-04-05 05:55:48,558 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1508677997] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:55:48,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [411340212] [2022-04-05 05:55:48,558 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-05 05:55:48,558 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:55:48,559 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:55:48,559 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 05:55:48,560 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-04-05 05:55:48,595 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-05 05:55:48,596 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 05:55:48,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 43 conjunts are in the unsatisfiable core [2022-04-05 05:55:48,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:55:48,711 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-04-05 05:55:48,711 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:55:49,230 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-04-05 05:55:49,231 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [411340212] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:55:49,231 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:55:49,231 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 46 [2022-04-05 05:55:49,231 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497929908] [2022-04-05 05:55:49,231 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:55:49,231 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-04-05 05:55:49,231 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:55:49,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-04-05 05:55:49,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=1759, Unknown=0, NotChecked=0, Total=2070 [2022-04-05 05:55:49,232 INFO L87 Difference]: Start difference. First operand 160 states and 188 transitions. Second operand has 46 states, 46 states have (on average 1.2173913043478262) internal successors, (56), 45 states have internal predecessors, (56), 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) [2022-04-05 05:56:48,480 WARN L232 SmtUtils]: Spent 27.08s on a formula simplification that was a NOOP. DAG size: 83 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 05:56:53,665 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-05 05:57:23,672 WARN L232 SmtUtils]: Spent 22.96s on a formula simplification that was a NOOP. DAG size: 80 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 05:58:06,001 WARN L232 SmtUtils]: Spent 27.11s on a formula simplification that was a NOOP. DAG size: 79 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 05:58:33,662 WARN L232 SmtUtils]: Spent 16.54s on a formula simplification that was a NOOP. DAG size: 77 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 05:59:00,884 WARN L232 SmtUtils]: Spent 16.94s on a formula simplification that was a NOOP. DAG size: 76 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 05:59:22,505 WARN L232 SmtUtils]: Spent 14.22s on a formula simplification that was a NOOP. DAG size: 75 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 05:59:52,168 WARN L232 SmtUtils]: Spent 14.68s on a formula simplification that was a NOOP. DAG size: 74 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 06:00:15,886 WARN L232 SmtUtils]: Spent 13.90s on a formula simplification that was a NOOP. DAG size: 73 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 06:00:35,685 WARN L232 SmtUtils]: Spent 12.63s on a formula simplification that was a NOOP. DAG size: 72 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 06:00:55,474 WARN L232 SmtUtils]: Spent 13.76s on a formula simplification that was a NOOP. DAG size: 71 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 06:01:09,856 WARN L232 SmtUtils]: Spent 7.18s on a formula simplification that was a NOOP. DAG size: 71 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 06:01:26,840 WARN L232 SmtUtils]: Spent 10.33s on a formula simplification that was a NOOP. DAG size: 70 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 06:01:43,871 WARN L232 SmtUtils]: Spent 6.83s on a formula simplification that was a NOOP. DAG size: 69 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 06:01:59,818 WARN L232 SmtUtils]: Spent 9.12s on a formula simplification that was a NOOP. DAG size: 68 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 06:02:24,888 WARN L232 SmtUtils]: Spent 7.00s on a formula simplification that was a NOOP. DAG size: 68 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 06:02:33,987 WARN L232 SmtUtils]: Spent 5.74s on a formula simplification that was a NOOP. DAG size: 67 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-05 06:02:44,496 WARN L232 SmtUtils]: Spent 6.03s on a formula simplification that was a NOOP. DAG size: 66 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)