/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/loopacceleration/qvasr/qvasr_64.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_14.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-34549b5 [2022-04-06 10:16:21,126 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-06 10:16:21,137 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-06 10:16:21,182 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-04-06 10:16:21,196 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-04-06 10:16:21,198 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-04-06 10:16:21,199 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-04-06 10:16:21,201 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-04-06 10:16:21,201 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-04-06 10:16:21,201 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-04-06 10:16:21,203 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-04-06 10:16:21,207 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-04-06 10:16:21,208 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-04-06 10:16:21,209 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-04-06 10:16:21,209 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-04-06 10:16:21,210 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-04-06 10:16:21,211 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-04-06 10:16:21,215 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2022-04-06 10:16:21,220 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-04-06 10:16:21,221 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-04-06 10:16:21,224 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-04-06 10:16:21,224 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/loopacceleration/qvasr/qvasr_64.epf [2022-04-06 10:16:21,244 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-06 10:16:21,244 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-06 10:16:21,244 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-04-06 10:16:21,245 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-04-06 10:16:21,245 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-04-06 10:16:21,245 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-04-06 10:16:21,245 INFO L138 SettingsManager]: * Use SBE=true [2022-04-06 10:16:21,246 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-06 10:16:21,246 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-06 10:16:21,246 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-06 10:16:21,246 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-06 10:16:21,247 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-06 10:16:21,247 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-06 10:16:21,247 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-06 10:16:21,247 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-06 10:16:21,247 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-06 10:16:21,247 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-06 10:16:21,247 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-06 10:16:21,247 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-06 10:16:21,247 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 10:16:21,247 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-06 10:16:21,247 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-04-06 10:16:21,248 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-04-06 10:16:21,248 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-04-06 10:16:21,248 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-04-06 10:16:21,248 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-06 10:16:21,248 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-04-06 10:16:21,248 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-04-06 10:16:21,249 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2022-04-06 10:16:21,249 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_QVASR WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-06 10:16:21,428 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-06 10:16:21,446 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-06 10:16:21,447 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-06 10:16:21,448 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-06 10:16:21,451 INFO L275 PluginConnector]: CDTParser initialized [2022-04-06 10:16:21,451 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_14.c [2022-04-06 10:16:21,496 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/29f616363/bd23a21d572e43f5a2fdea4e575de9ca/FLAG22061f4b0 [2022-04-06 10:16:21,844 INFO L306 CDTParser]: Found 1 translation units. [2022-04-06 10:16:21,845 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_14.c [2022-04-06 10:16:21,848 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/29f616363/bd23a21d572e43f5a2fdea4e575de9ca/FLAG22061f4b0 [2022-04-06 10:16:21,856 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/29f616363/bd23a21d572e43f5a2fdea4e575de9ca [2022-04-06 10:16:21,858 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-06 10:16:21,859 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2022-04-06 10:16:21,860 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-06 10:16:21,860 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-06 10:16:21,862 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-06 10:16:21,862 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 10:16:21" (1/1) ... [2022-04-06 10:16:21,863 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@270624d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 10:16:21, skipping insertion in model container [2022-04-06 10:16:21,863 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 10:16:21" (1/1) ... [2022-04-06 10:16:21,867 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-06 10:16:21,877 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-06 10:16:21,981 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_14.c[319,332] [2022-04-06 10:16:22,003 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 10:16:22,012 INFO L203 MainTranslator]: Completed pre-run [2022-04-06 10:16:22,020 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_14.c[319,332] [2022-04-06 10:16:22,022 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 10:16:22,030 INFO L208 MainTranslator]: Completed translation [2022-04-06 10:16:22,030 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 10:16:22 WrapperNode [2022-04-06 10:16:22,030 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-06 10:16:22,031 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-06 10:16:22,031 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-06 10:16:22,031 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-06 10:16:22,038 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 10:16:22" (1/1) ... [2022-04-06 10:16:22,038 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 10:16:22" (1/1) ... [2022-04-06 10:16:22,042 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 10:16:22" (1/1) ... [2022-04-06 10:16:22,042 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 10:16:22" (1/1) ... [2022-04-06 10:16:22,045 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 10:16:22" (1/1) ... [2022-04-06 10:16:22,048 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 10:16:22" (1/1) ... [2022-04-06 10:16:22,052 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 10:16:22" (1/1) ... [2022-04-06 10:16:22,056 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-06 10:16:22,056 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-06 10:16:22,056 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-06 10:16:22,056 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-06 10:16:22,061 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 10:16:22" (1/1) ... [2022-04-06 10:16:22,073 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 10:16:22,084 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:16:22,093 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-04-06 10:16:22,098 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-04-06 10:16:22,115 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-06 10:16:22,116 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-06 10:16:22,116 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-06 10:16:22,116 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-06 10:16:22,116 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-06 10:16:22,116 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-06 10:16:22,116 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-06 10:16:22,116 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-06 10:16:22,116 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-06 10:16:22,116 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-06 10:16:22,116 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-06 10:16:22,117 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-06 10:16:22,117 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-06 10:16:22,117 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-06 10:16:22,117 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-06 10:16:22,117 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-06 10:16:22,117 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-06 10:16:22,159 INFO L234 CfgBuilder]: Building ICFG [2022-04-06 10:16:22,160 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-06 10:16:22,264 INFO L275 CfgBuilder]: Performing block encoding [2022-04-06 10:16:22,268 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-06 10:16:22,268 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-04-06 10:16:22,269 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 10:16:22 BoogieIcfgContainer [2022-04-06 10:16:22,269 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-06 10:16:22,270 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2022-04-06 10:16:22,270 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2022-04-06 10:16:22,270 INFO L275 PluginConnector]: IcfgTransformer initialized [2022-04-06 10:16:22,272 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 10:16:22" (1/1) ... [2022-04-06 10:16:22,274 INFO L168 ansformationObserver]: Applying ICFG transformation LOOP_ACCELERATION_QVASR [2022-04-06 10:16:22,282 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.04 10:16:22 BasicIcfg [2022-04-06 10:16:22,282 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2022-04-06 10:16:22,284 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-06 10:16:22,284 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-06 10:16:22,285 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-06 10:16:22,286 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.04 10:16:21" (1/4) ... [2022-04-06 10:16:22,286 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@177a005a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 10:16:22, skipping insertion in model container [2022-04-06 10:16:22,286 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 10:16:22" (2/4) ... [2022-04-06 10:16:22,286 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@177a005a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 10:16:22, skipping insertion in model container [2022-04-06 10:16:22,286 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 10:16:22" (3/4) ... [2022-04-06 10:16:22,287 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@177a005a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.04 10:16:22, skipping insertion in model container [2022-04-06 10:16:22,287 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.04 10:16:22" (4/4) ... [2022-04-06 10:16:22,287 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_14.cqvasr [2022-04-06 10:16:22,290 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-04-06 10:16:22,290 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-06 10:16:22,318 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-06 10:16:22,322 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-04-06 10:16:22,323 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-06 10:16:22,332 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-04-06 10:16:22,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-04-06 10:16:22,335 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:16:22,335 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:16:22,336 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:16:22,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:16:22,339 INFO L85 PathProgramCache]: Analyzing trace with hash -412568735, now seen corresponding path program 1 times [2022-04-06 10:16:22,344 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:16:22,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2021477294] [2022-04-06 10:16:22,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:16:22,345 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:16:22,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:22,474 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:16:22,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:22,481 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 10:16:22,481 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:16:22,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2021477294] [2022-04-06 10:16:22,482 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2021477294] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 10:16:22,482 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 10:16:22,482 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 10:16:22,486 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233004588] [2022-04-06 10:16:22,487 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 10:16:22,489 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-04-06 10:16:22,489 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:16:22,541 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-04-06 10:16:22,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 10:16:22,543 INFO L87 Difference]: Start difference. First operand has 22 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:16:22,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:16:22,578 INFO L93 Difference]: Finished difference Result 36 states and 47 transitions. [2022-04-06 10:16:22,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-04-06 10:16:22,580 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2022-04-06 10:16:22,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:16:22,584 INFO L225 Difference]: With dead ends: 36 [2022-04-06 10:16:22,584 INFO L226 Difference]: Without dead ends: 17 [2022-04-06 10:16:22,586 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 10:16:22,588 INFO L913 BasicCegarLoop]: 23 mSDtfsCounter, 14 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 10:16:22,589 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 26 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 10:16:22,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-04-06 10:16:22,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-04-06 10:16:22,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 10:16:22,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2022-04-06 10:16:22,620 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 12 [2022-04-06 10:16:22,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:16:22,621 INFO L478 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2022-04-06 10:16:22,621 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:16:22,621 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2022-04-06 10:16:22,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-04-06 10:16:22,622 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:16:22,622 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:16:22,623 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-06 10:16:22,623 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:16:22,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:16:22,625 INFO L85 PathProgramCache]: Analyzing trace with hash -383016063, now seen corresponding path program 1 times [2022-04-06 10:16:22,625 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:16:22,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [719017220] [2022-04-06 10:16:22,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:16:22,626 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:16:22,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:22,706 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:16:22,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:22,715 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 10:16:22,715 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:16:22,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [719017220] [2022-04-06 10:16:22,716 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [719017220] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 10:16:22,716 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 10:16:22,716 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-04-06 10:16:22,716 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971703405] [2022-04-06 10:16:22,716 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 10:16:22,717 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-04-06 10:16:22,717 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:16:22,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-04-06 10:16:22,718 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-04-06 10:16:22,718 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:16:22,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:16:22,757 INFO L93 Difference]: Finished difference Result 30 states and 38 transitions. [2022-04-06 10:16:22,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-04-06 10:16:22,758 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2022-04-06 10:16:22,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:16:22,758 INFO L225 Difference]: With dead ends: 30 [2022-04-06 10:16:22,758 INFO L226 Difference]: Without dead ends: 19 [2022-04-06 10:16:22,759 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-04-06 10:16:22,760 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 14 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 10:16:22,761 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 24 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 10:16:22,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-04-06 10:16:22,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-04-06 10:16:22,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 10:16:22,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2022-04-06 10:16:22,764 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 12 [2022-04-06 10:16:22,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:16:22,765 INFO L478 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2022-04-06 10:16:22,765 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:16:22,765 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2022-04-06 10:16:22,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-04-06 10:16:22,765 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:16:22,765 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:16:22,765 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-04-06 10:16:22,766 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:16:22,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:16:22,766 INFO L85 PathProgramCache]: Analyzing trace with hash 305534661, now seen corresponding path program 1 times [2022-04-06 10:16:22,766 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:16:22,766 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [43563672] [2022-04-06 10:16:22,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:16:22,767 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:16:22,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:22,797 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:16:22,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:22,813 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 10:16:22,813 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:16:22,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [43563672] [2022-04-06 10:16:22,814 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [43563672] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 10:16:22,814 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 10:16:22,814 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-04-06 10:16:22,814 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149040150] [2022-04-06 10:16:22,814 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 10:16:22,815 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-04-06 10:16:22,815 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:16:22,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-04-06 10:16:22,815 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-04-06 10:16:22,815 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:16:22,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:16:22,840 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2022-04-06 10:16:22,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-04-06 10:16:22,840 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2022-04-06 10:16:22,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:16:22,841 INFO L225 Difference]: With dead ends: 28 [2022-04-06 10:16:22,841 INFO L226 Difference]: Without dead ends: 20 [2022-04-06 10:16:22,842 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-04-06 10:16:22,846 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 11 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 10:16:22,847 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 24 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 10:16:22,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-04-06 10:16:22,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-04-06 10:16:22,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 14 states have internal predecessors, (17), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 10:16:22,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2022-04-06 10:16:22,850 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 14 [2022-04-06 10:16:22,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:16:22,850 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2022-04-06 10:16:22,850 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:16:22,850 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2022-04-06 10:16:22,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-04-06 10:16:22,851 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:16:22,851 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:16:22,851 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-04-06 10:16:22,851 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:16:22,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:16:22,852 INFO L85 PathProgramCache]: Analyzing trace with hash 906513450, now seen corresponding path program 1 times [2022-04-06 10:16:22,852 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:16:22,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1122597970] [2022-04-06 10:16:22,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:16:22,852 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:16:22,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:22,878 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:16:22,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:22,882 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 10:16:22,883 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:16:22,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1122597970] [2022-04-06 10:16:22,883 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1122597970] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 10:16:22,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [218389599] [2022-04-06 10:16:22,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:16:22,883 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:16:22,883 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:16:22,884 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 10:16:22,885 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-04-06 10:16:22,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:22,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 3 conjunts are in the unsatisfiable core [2022-04-06 10:16:22,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 10:16:22,989 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 10:16:22,989 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 10:16:23,045 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 10:16:23,045 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [218389599] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 10:16:23,046 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 10:16:23,046 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 8 [2022-04-06 10:16:23,046 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728438377] [2022-04-06 10:16:23,047 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 10:16:23,047 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-04-06 10:16:23,047 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:16:23,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-04-06 10:16:23,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2022-04-06 10:16:23,048 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:16:23,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:16:23,133 INFO L93 Difference]: Finished difference Result 37 states and 48 transitions. [2022-04-06 10:16:23,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-04-06 10:16:23,134 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-04-06 10:16:23,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:16:23,135 INFO L225 Difference]: With dead ends: 37 [2022-04-06 10:16:23,135 INFO L226 Difference]: Without dead ends: 25 [2022-04-06 10:16:23,137 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2022-04-06 10:16:23,143 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 18 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 10:16:23,143 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 28 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 10:16:23,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-04-06 10:16:23,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-04-06 10:16:23,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 19 states have internal predecessors, (23), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 10:16:23,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2022-04-06 10:16:23,147 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 15 [2022-04-06 10:16:23,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:16:23,147 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2022-04-06 10:16:23,147 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:16:23,147 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2022-04-06 10:16:23,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-04-06 10:16:23,147 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:16:23,148 INFO L499 BasicCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:16:23,178 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-04-06 10:16:23,348 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:16:23,349 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:16:23,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:16:23,349 INFO L85 PathProgramCache]: Analyzing trace with hash 1586204636, now seen corresponding path program 1 times [2022-04-06 10:16:23,349 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:16:23,349 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1588833587] [2022-04-06 10:16:23,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:16:23,350 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:16:23,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:23,408 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:16:23,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:23,423 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-04-06 10:16:23,423 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:16:23,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1588833587] [2022-04-06 10:16:23,424 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1588833587] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 10:16:23,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1242979753] [2022-04-06 10:16:23,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:16:23,424 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:16:23,424 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:16:23,426 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 10:16:23,427 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-04-06 10:16:23,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:23,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 4 conjunts are in the unsatisfiable core [2022-04-06 10:16:23,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 10:16:23,495 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-04-06 10:16:23,495 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 10:16:23,557 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-04-06 10:16:23,558 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1242979753] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 10:16:23,558 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 10:16:23,558 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 10 [2022-04-06 10:16:23,558 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1746886968] [2022-04-06 10:16:23,558 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 10:16:23,558 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-04-06 10:16:23,559 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:16:23,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-04-06 10:16:23,559 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2022-04-06 10:16:23,559 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:16:23,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:16:23,673 INFO L93 Difference]: Finished difference Result 48 states and 60 transitions. [2022-04-06 10:16:23,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-04-06 10:16:23,673 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 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 [2022-04-06 10:16:23,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:16:23,674 INFO L225 Difference]: With dead ends: 48 [2022-04-06 10:16:23,674 INFO L226 Difference]: Without dead ends: 33 [2022-04-06 10:16:23,676 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2022-04-06 10:16:23,676 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 18 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 10:16:23,676 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 39 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 10:16:23,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-04-06 10:16:23,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-04-06 10:16:23,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 27 states have internal predecessors, (31), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 10:16:23,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2022-04-06 10:16:23,681 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 21 [2022-04-06 10:16:23,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:16:23,681 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2022-04-06 10:16:23,682 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:16:23,682 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2022-04-06 10:16:23,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-04-06 10:16:23,683 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:16:23,683 INFO L499 BasicCegarLoop]: trace histogram [8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:16:23,701 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-04-06 10:16:23,899 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:16:23,899 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:16:23,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:16:23,900 INFO L85 PathProgramCache]: Analyzing trace with hash -233424180, now seen corresponding path program 2 times [2022-04-06 10:16:23,900 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:16:23,900 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [413769178] [2022-04-06 10:16:23,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:16:23,900 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:16:23,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:23,958 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:16:23,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:23,964 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-04-06 10:16:23,964 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:16:23,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [413769178] [2022-04-06 10:16:23,964 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [413769178] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 10:16:23,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [686994767] [2022-04-06 10:16:23,964 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 10:16:23,965 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:16:23,965 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:16:23,978 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 10:16:23,979 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-04-06 10:16:24,006 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 10:16:24,006 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 10:16:24,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 8 conjunts are in the unsatisfiable core [2022-04-06 10:16:24,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 10:16:24,057 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-04-06 10:16:24,058 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 10:16:24,159 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-04-06 10:16:24,159 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [686994767] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 10:16:24,159 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 10:16:24,159 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 18 [2022-04-06 10:16:24,159 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283383360] [2022-04-06 10:16:24,159 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 10:16:24,160 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-04-06 10:16:24,160 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:16:24,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-04-06 10:16:24,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2022-04-06 10:16:24,161 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand has 18 states, 18 states have (on average 2.4444444444444446) internal successors, (44), 17 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:16:24,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:16:24,340 INFO L93 Difference]: Finished difference Result 64 states and 80 transitions. [2022-04-06 10:16:24,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-04-06 10:16:24,340 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.4444444444444446) internal successors, (44), 17 states have internal predecessors, (44), 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 [2022-04-06 10:16:24,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:16:24,341 INFO L225 Difference]: With dead ends: 64 [2022-04-06 10:16:24,341 INFO L226 Difference]: Without dead ends: 49 [2022-04-06 10:16:24,342 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=377, Invalid=615, Unknown=0, NotChecked=0, Total=992 [2022-04-06 10:16:24,342 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 26 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 10:16:24,342 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 39 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 10:16:24,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-04-06 10:16:24,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2022-04-06 10:16:24,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 42 states have (on average 1.119047619047619) internal successors, (47), 43 states have internal predecessors, (47), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 10:16:24,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2022-04-06 10:16:24,347 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 29 [2022-04-06 10:16:24,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:16:24,347 INFO L478 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2022-04-06 10:16:24,347 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.4444444444444446) internal successors, (44), 17 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:16:24,347 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2022-04-06 10:16:24,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-04-06 10:16:24,348 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:16:24,348 INFO L499 BasicCegarLoop]: trace histogram [16, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:16:24,364 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-04-06 10:16:24,557 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:16:24,557 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:16:24,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:16:24,558 INFO L85 PathProgramCache]: Analyzing trace with hash 2041954476, now seen corresponding path program 3 times [2022-04-06 10:16:24,558 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:16:24,558 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1160737973] [2022-04-06 10:16:24,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:16:24,558 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:16:24,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:24,716 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:16:24,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:24,721 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 45 proven. 210 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-04-06 10:16:24,721 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:16:24,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1160737973] [2022-04-06 10:16:24,721 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1160737973] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 10:16:24,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1956168676] [2022-04-06 10:16:24,721 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-04-06 10:16:24,721 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:16:24,721 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:16:24,728 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 10:16:24,729 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-04-06 10:16:24,755 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-04-06 10:16:24,755 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 10:16:24,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 5 conjunts are in the unsatisfiable core [2022-04-06 10:16:24,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 10:16:24,854 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 46 proven. 1 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-04-06 10:16:24,854 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 10:16:24,959 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 46 proven. 1 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-04-06 10:16:24,959 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1956168676] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 10:16:24,959 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 10:16:24,959 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 5, 5] total 24 [2022-04-06 10:16:24,960 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [787261700] [2022-04-06 10:16:24,960 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 10:16:24,960 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-04-06 10:16:24,960 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:16:24,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-04-06 10:16:24,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=387, Unknown=0, NotChecked=0, Total=552 [2022-04-06 10:16:24,961 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand has 24 states, 24 states have (on average 2.5) internal successors, (60), 23 states have internal predecessors, (60), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:16:25,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:16:25,253 INFO L93 Difference]: Finished difference Result 75 states and 90 transitions. [2022-04-06 10:16:25,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-04-06 10:16:25,254 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.5) internal successors, (60), 23 states have internal predecessors, (60), 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 45 [2022-04-06 10:16:25,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:16:25,255 INFO L225 Difference]: With dead ends: 75 [2022-04-06 10:16:25,255 INFO L226 Difference]: Without dead ends: 60 [2022-04-06 10:16:25,255 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 321 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=584, Invalid=1308, Unknown=0, NotChecked=0, Total=1892 [2022-04-06 10:16:25,256 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 48 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 10:16:25,256 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 36 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 10:16:25,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-04-06 10:16:25,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2022-04-06 10:16:25,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 47 states have (on average 1.1063829787234043) internal successors, (52), 48 states have internal predecessors, (52), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 10:16:25,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2022-04-06 10:16:25,261 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 45 [2022-04-06 10:16:25,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:16:25,261 INFO L478 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2022-04-06 10:16:25,261 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.5) internal successors, (60), 23 states have internal predecessors, (60), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:16:25,261 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2022-04-06 10:16:25,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-04-06 10:16:25,262 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:16:25,262 INFO L499 BasicCegarLoop]: trace histogram [17, 15, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:16:25,278 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-04-06 10:16:25,471 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:16:25,471 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:16:25,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:16:25,472 INFO L85 PathProgramCache]: Analyzing trace with hash -829092473, now seen corresponding path program 4 times [2022-04-06 10:16:25,472 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:16:25,472 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [430316238] [2022-04-06 10:16:25,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:16:25,472 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:16:25,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:25,616 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:16:25,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:25,629 INFO L134 CoverageAnalysis]: Checked inductivity of 299 backedges. 48 proven. 240 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-04-06 10:16:25,629 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:16:25,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [430316238] [2022-04-06 10:16:25,629 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [430316238] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 10:16:25,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1630214704] [2022-04-06 10:16:25,629 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 10:16:25,629 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:16:25,629 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:16:25,639 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 10:16:25,640 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-04-06 10:16:25,675 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 10:16:25,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 10:16:25,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 17 conjunts are in the unsatisfiable core [2022-04-06 10:16:25,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 10:16:25,786 INFO L134 CoverageAnalysis]: Checked inductivity of 299 backedges. 48 proven. 240 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-04-06 10:16:25,786 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 10:16:26,121 INFO L134 CoverageAnalysis]: Checked inductivity of 299 backedges. 48 proven. 240 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-04-06 10:16:26,122 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1630214704] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 10:16:26,122 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 10:16:26,122 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 36 [2022-04-06 10:16:26,122 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [318234209] [2022-04-06 10:16:26,122 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 10:16:26,123 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-04-06 10:16:26,123 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:16:26,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-04-06 10:16:26,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2022-04-06 10:16:26,124 INFO L87 Difference]: Start difference. First operand 54 states and 58 transitions. Second operand has 36 states, 36 states have (on average 2.2222222222222223) internal successors, (80), 35 states have internal predecessors, (80), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:16:26,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:16:26,539 INFO L93 Difference]: Finished difference Result 106 states and 131 transitions. [2022-04-06 10:16:26,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-04-06 10:16:26,540 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.2222222222222223) internal successors, (80), 35 states have internal predecessors, (80), 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 50 [2022-04-06 10:16:26,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:16:26,540 INFO L225 Difference]: With dead ends: 106 [2022-04-06 10:16:26,540 INFO L226 Difference]: Without dead ends: 88 [2022-04-06 10:16:26,542 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 706 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1718, Invalid=2838, Unknown=0, NotChecked=0, Total=4556 [2022-04-06 10:16:26,542 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 44 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 10:16:26,542 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 34 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 10:16:26,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-04-06 10:16:26,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2022-04-06 10:16:26,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 81 states have (on average 1.0617283950617284) internal successors, (86), 82 states have internal predecessors, (86), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 10:16:26,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 92 transitions. [2022-04-06 10:16:26,553 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 92 transitions. Word has length 50 [2022-04-06 10:16:26,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:16:26,554 INFO L478 AbstractCegarLoop]: Abstraction has 88 states and 92 transitions. [2022-04-06 10:16:26,554 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.2222222222222223) internal successors, (80), 35 states have internal predecessors, (80), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:16:26,554 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 92 transitions. [2022-04-06 10:16:26,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-04-06 10:16:26,557 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:16:26,557 INFO L499 BasicCegarLoop]: trace histogram [34, 32, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:16:26,573 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-04-06 10:16:26,757 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:16:26,757 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:16:26,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:16:26,758 INFO L85 PathProgramCache]: Analyzing trace with hash 1432513035, now seen corresponding path program 5 times [2022-04-06 10:16:26,758 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:16:26,758 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1651790083] [2022-04-06 10:16:26,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:16:26,758 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:16:26,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:27,190 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:16:27,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:27,194 INFO L134 CoverageAnalysis]: Checked inductivity of 1166 backedges. 99 proven. 1056 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-04-06 10:16:27,194 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:16:27,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1651790083] [2022-04-06 10:16:27,194 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1651790083] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 10:16:27,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [986361057] [2022-04-06 10:16:27,194 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-04-06 10:16:27,194 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:16:27,194 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:16:27,195 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 10:16:27,210 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-04-06 10:16:27,245 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 35 check-sat command(s) [2022-04-06 10:16:27,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 10:16:27,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 34 conjunts are in the unsatisfiable core [2022-04-06 10:16:27,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 10:16:27,364 INFO L134 CoverageAnalysis]: Checked inductivity of 1166 backedges. 99 proven. 1056 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-04-06 10:16:27,364 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 10:16:28,485 INFO L134 CoverageAnalysis]: Checked inductivity of 1166 backedges. 99 proven. 1056 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-04-06 10:16:28,486 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [986361057] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 10:16:28,486 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 10:16:28,486 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 70 [2022-04-06 10:16:28,486 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [587380273] [2022-04-06 10:16:28,486 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 10:16:28,486 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-04-06 10:16:28,486 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:16:28,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-04-06 10:16:28,489 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2348, Invalid=2482, Unknown=0, NotChecked=0, Total=4830 [2022-04-06 10:16:28,489 INFO L87 Difference]: Start difference. First operand 88 states and 92 transitions. Second operand has 70 states, 70 states have (on average 2.1142857142857143) internal successors, (148), 69 states have internal predecessors, (148), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:16:30,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:16:30,121 INFO L93 Difference]: Finished difference Result 174 states and 216 transitions. [2022-04-06 10:16:30,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-04-06 10:16:30,121 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 2.1142857142857143) internal successors, (148), 69 states have internal predecessors, (148), 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 84 [2022-04-06 10:16:30,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:16:30,122 INFO L225 Difference]: With dead ends: 174 [2022-04-06 10:16:30,122 INFO L226 Difference]: Without dead ends: 156 [2022-04-06 10:16:30,126 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2865 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=6903, Invalid=11457, Unknown=0, NotChecked=0, Total=18360 [2022-04-06 10:16:30,126 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 78 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 234 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 234 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-06 10:16:30,126 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 59 Invalid, 340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 234 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-06 10:16:30,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2022-04-06 10:16:30,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 156. [2022-04-06 10:16:30,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 149 states have (on average 1.0335570469798658) internal successors, (154), 150 states have internal predecessors, (154), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 10:16:30,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 160 transitions. [2022-04-06 10:16:30,158 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 160 transitions. Word has length 84 [2022-04-06 10:16:30,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:16:30,158 INFO L478 AbstractCegarLoop]: Abstraction has 156 states and 160 transitions. [2022-04-06 10:16:30,159 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 2.1142857142857143) internal successors, (148), 69 states have internal predecessors, (148), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:16:30,159 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 160 transitions. [2022-04-06 10:16:30,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2022-04-06 10:16:30,160 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:16:30,160 INFO L499 BasicCegarLoop]: trace histogram [68, 66, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:16:30,178 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-04-06 10:16:30,360 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:16:30,361 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:16:30,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:16:30,361 INFO L85 PathProgramCache]: Analyzing trace with hash 59310099, now seen corresponding path program 6 times [2022-04-06 10:16:30,361 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:16:30,361 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1663094365] [2022-04-06 10:16:30,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:16:30,361 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:16:30,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:31,864 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:16:31,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:31,870 INFO L134 CoverageAnalysis]: Checked inductivity of 4634 backedges. 201 proven. 4422 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-04-06 10:16:31,870 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:16:31,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1663094365] [2022-04-06 10:16:31,871 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1663094365] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 10:16:31,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [329808947] [2022-04-06 10:16:31,871 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 10:16:31,871 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:16:31,871 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:16:31,872 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 10:16:31,873 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-04-06 10:16:31,919 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-04-06 10:16:31,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 10:16:31,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 13 conjunts are in the unsatisfiable core [2022-04-06 10:16:31,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 10:16:32,341 INFO L134 CoverageAnalysis]: Checked inductivity of 4634 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 4624 trivial. 0 not checked. [2022-04-06 10:16:32,341 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 10:16:32,712 INFO L134 CoverageAnalysis]: Checked inductivity of 4634 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 4628 trivial. 0 not checked. [2022-04-06 10:16:32,712 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [329808947] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 10:16:32,713 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 10:16:32,713 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 9, 6] total 79 [2022-04-06 10:16:32,713 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1448582305] [2022-04-06 10:16:32,713 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 10:16:32,713 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-04-06 10:16:32,713 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:16:32,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-04-06 10:16:32,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2371, Invalid=3791, Unknown=0, NotChecked=0, Total=6162 [2022-04-06 10:16:32,715 INFO L87 Difference]: Start difference. First operand 156 states and 160 transitions. Second operand has 79 states, 79 states have (on average 2.1012658227848102) internal successors, (166), 77 states have internal predecessors, (166), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:16:34,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:16:34,828 INFO L93 Difference]: Finished difference Result 186 states and 199 transitions. [2022-04-06 10:16:34,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2022-04-06 10:16:34,828 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 2.1012658227848102) internal successors, (166), 77 states have internal predecessors, (166), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 152 [2022-04-06 10:16:34,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:16:34,831 INFO L225 Difference]: With dead ends: 186 [2022-04-06 10:16:34,831 INFO L226 Difference]: Without dead ends: 168 [2022-04-06 10:16:34,836 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 450 GetRequests, 296 SyntacticMatches, 1 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3576 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=7377, Invalid=16493, Unknown=0, NotChecked=0, Total=23870 [2022-04-06 10:16:34,837 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 89 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 467 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 560 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 467 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-06 10:16:34,837 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 89 Invalid, 560 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 467 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-06 10:16:34,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-04-06 10:16:34,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 164. [2022-04-06 10:16:34,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 155 states have (on average 1.038709677419355) internal successors, (161), 157 states have internal predecessors, (161), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-06 10:16:34,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 169 transitions. [2022-04-06 10:16:34,850 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 169 transitions. Word has length 152 [2022-04-06 10:16:34,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:16:34,850 INFO L478 AbstractCegarLoop]: Abstraction has 164 states and 169 transitions. [2022-04-06 10:16:34,850 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 2.1012658227848102) internal successors, (166), 77 states have internal predecessors, (166), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:16:34,850 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 169 transitions. [2022-04-06 10:16:34,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2022-04-06 10:16:34,851 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:16:34,851 INFO L499 BasicCegarLoop]: trace histogram [69, 67, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:16:34,869 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-04-06 10:16:35,067 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:16:35,067 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:16:35,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:16:35,068 INFO L85 PathProgramCache]: Analyzing trace with hash -321599528, now seen corresponding path program 7 times [2022-04-06 10:16:35,068 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:16:35,068 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942356549] [2022-04-06 10:16:35,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:16:35,068 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:16:35,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:36,355 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:16:36,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:36,364 INFO L134 CoverageAnalysis]: Checked inductivity of 4776 backedges. 204 proven. 4556 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-06 10:16:36,365 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:16:36,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1942356549] [2022-04-06 10:16:36,365 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1942356549] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 10:16:36,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2023795080] [2022-04-06 10:16:36,365 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-04-06 10:16:36,370 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:16:36,371 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:16:36,371 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 10:16:36,373 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-04-06 10:16:36,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:36,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 371 conjuncts, 69 conjunts are in the unsatisfiable core [2022-04-06 10:16:36,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 10:16:36,770 INFO L134 CoverageAnalysis]: Checked inductivity of 4776 backedges. 204 proven. 4556 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-06 10:16:36,770 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 10:16:39,801 INFO L134 CoverageAnalysis]: Checked inductivity of 4776 backedges. 204 proven. 4556 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-06 10:16:39,801 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2023795080] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 10:16:39,801 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 10:16:39,802 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 70, 70] total 140 [2022-04-06 10:16:39,802 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016580650] [2022-04-06 10:16:39,802 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 10:16:39,802 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 140 states [2022-04-06 10:16:39,802 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:16:39,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2022-04-06 10:16:39,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9593, Invalid=9867, Unknown=0, NotChecked=0, Total=19460 [2022-04-06 10:16:39,805 INFO L87 Difference]: Start difference. First operand 164 states and 169 transitions. Second operand has 140 states, 140 states have (on average 2.057142857142857) internal successors, (288), 139 states have internal predecessors, (288), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:16:45,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:16:45,337 INFO L93 Difference]: Finished difference Result 326 states and 405 transitions. [2022-04-06 10:16:45,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2022-04-06 10:16:45,338 INFO L78 Accepts]: Start accepts. Automaton has has 140 states, 140 states have (on average 2.057142857142857) internal successors, (288), 139 states have internal predecessors, (288), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 155 [2022-04-06 10:16:45,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:16:45,340 INFO L225 Difference]: With dead ends: 326 [2022-04-06 10:16:45,340 INFO L226 Difference]: Without dead ends: 302 [2022-04-06 10:16:45,345 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 243 SyntacticMatches, 0 SemanticMatches, 274 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11860 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=28498, Invalid=47402, Unknown=0, NotChecked=0, Total=75900 [2022-04-06 10:16:45,345 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 148 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 372 mSolverCounterSat, 215 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 587 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 215 IncrementalHoareTripleChecker+Valid, 372 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 10:16:45,345 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [149 Valid, 59 Invalid, 587 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [215 Valid, 372 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 10:16:45,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2022-04-06 10:16:45,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 302. [2022-04-06 10:16:45,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 302 states, 293 states have (on average 1.0204778156996588) internal successors, (299), 295 states have internal predecessors, (299), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-06 10:16:45,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 307 transitions. [2022-04-06 10:16:45,358 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 307 transitions. Word has length 155 [2022-04-06 10:16:45,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:16:45,358 INFO L478 AbstractCegarLoop]: Abstraction has 302 states and 307 transitions. [2022-04-06 10:16:45,358 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 140 states, 140 states have (on average 2.057142857142857) internal successors, (288), 139 states have internal predecessors, (288), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:16:45,358 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 307 transitions. [2022-04-06 10:16:45,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 294 [2022-04-06 10:16:45,360 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:16:45,360 INFO L499 BasicCegarLoop]: trace histogram [138, 136, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:16:45,378 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-04-06 10:16:45,575 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-04-06 10:16:45,576 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:16:45,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:16:45,576 INFO L85 PathProgramCache]: Analyzing trace with hash 189992452, now seen corresponding path program 8 times [2022-04-06 10:16:45,576 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:16:45,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1650291737] [2022-04-06 10:16:45,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:16:45,576 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:16:45,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:49,746 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:16:49,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:16:49,760 INFO L134 CoverageAnalysis]: Checked inductivity of 19059 backedges. 411 proven. 18632 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-06 10:16:49,760 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:16:49,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1650291737] [2022-04-06 10:16:49,761 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1650291737] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 10:16:49,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087174208] [2022-04-06 10:16:49,761 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 10:16:49,761 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:16:49,761 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:16:49,775 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 10:16:49,784 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-04-06 10:16:49,888 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 10:16:49,888 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 10:16:49,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 647 conjuncts, 138 conjunts are in the unsatisfiable core [2022-04-06 10:16:49,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 10:16:50,336 INFO L134 CoverageAnalysis]: Checked inductivity of 19059 backedges. 411 proven. 18632 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-06 10:16:50,336 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 10:17:02,059 INFO L134 CoverageAnalysis]: Checked inductivity of 19059 backedges. 411 proven. 18632 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-06 10:17:02,059 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1087174208] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 10:17:02,059 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 10:17:02,059 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [140, 139, 139] total 278 [2022-04-06 10:17:02,059 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [61703970] [2022-04-06 10:17:02,059 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 10:17:02,060 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 278 states [2022-04-06 10:17:02,060 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:17:02,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 278 interpolants. [2022-04-06 10:17:02,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38228, Invalid=38778, Unknown=0, NotChecked=0, Total=77006 [2022-04-06 10:17:02,068 INFO L87 Difference]: Start difference. First operand 302 states and 307 transitions. Second operand has 278 states, 278 states have (on average 2.028776978417266) internal successors, (564), 277 states have internal predecessors, (564), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:17:20,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:17:20,377 INFO L93 Difference]: Finished difference Result 602 states and 750 transitions. [2022-04-06 10:17:20,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 277 states. [2022-04-06 10:17:20,385 INFO L78 Accepts]: Start accepts. Automaton has has 278 states, 278 states have (on average 2.028776978417266) internal successors, (564), 277 states have internal predecessors, (564), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 293 [2022-04-06 10:17:20,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:17:20,388 INFO L225 Difference]: With dead ends: 602 [2022-04-06 10:17:20,388 INFO L226 Difference]: Without dead ends: 578 [2022-04-06 10:17:20,400 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 1000 GetRequests, 450 SyntacticMatches, 0 SemanticMatches, 550 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47533 ImplicationChecksByTransitivity, 31.9s TimeCoverageRelationStatistics Valid=114127, Invalid=190025, Unknown=0, NotChecked=0, Total=304152 [2022-04-06 10:17:20,401 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 286 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 662 mSolverCounterSat, 421 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 287 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 1083 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 421 IncrementalHoareTripleChecker+Valid, 662 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-04-06 10:17:20,401 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [287 Valid, 64 Invalid, 1083 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [421 Valid, 662 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-04-06 10:17:20,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 578 states. [2022-04-06 10:17:20,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 578 to 578. [2022-04-06 10:17:20,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 578 states, 569 states have (on average 1.0105448154657293) internal successors, (575), 571 states have internal predecessors, (575), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-06 10:17:20,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 578 states to 578 states and 583 transitions. [2022-04-06 10:17:20,422 INFO L78 Accepts]: Start accepts. Automaton has 578 states and 583 transitions. Word has length 293 [2022-04-06 10:17:20,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:17:20,422 INFO L478 AbstractCegarLoop]: Abstraction has 578 states and 583 transitions. [2022-04-06 10:17:20,423 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 278 states, 278 states have (on average 2.028776978417266) internal successors, (564), 277 states have internal predecessors, (564), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:17:20,423 INFO L276 IsEmpty]: Start isEmpty. Operand 578 states and 583 transitions. [2022-04-06 10:17:20,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 570 [2022-04-06 10:17:20,428 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:17:20,428 INFO L499 BasicCegarLoop]: trace histogram [276, 274, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:17:20,447 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-04-06 10:17:20,651 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:17:20,652 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:17:20,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:17:20,652 INFO L85 PathProgramCache]: Analyzing trace with hash -1712470692, now seen corresponding path program 9 times [2022-04-06 10:17:20,652 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:17:20,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [903746331] [2022-04-06 10:17:20,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:17:20,652 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:17:20,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:17:37,469 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:17:37,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:17:37,481 INFO L134 CoverageAnalysis]: Checked inductivity of 76191 backedges. 825 proven. 75350 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-06 10:17:37,481 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:17:37,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [903746331] [2022-04-06 10:17:37,481 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [903746331] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 10:17:37,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [747020092] [2022-04-06 10:17:37,481 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-04-06 10:17:37,481 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:17:37,482 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:17:37,483 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 10:17:37,532 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-04-06 10:17:37,592 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-04-06 10:17:37,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 10:17:37,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 9 conjunts are in the unsatisfiable core [2022-04-06 10:17:37,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 10:17:38,748 INFO L134 CoverageAnalysis]: Checked inductivity of 76191 backedges. 826 proven. 15 refuted. 0 times theorem prover too weak. 75350 trivial. 0 not checked. [2022-04-06 10:17:38,748 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 10:17:40,135 INFO L134 CoverageAnalysis]: Checked inductivity of 76191 backedges. 826 proven. 15 refuted. 0 times theorem prover too weak. 75350 trivial. 0 not checked. [2022-04-06 10:17:40,135 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [747020092] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 10:17:40,135 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 10:17:40,135 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [278, 9, 9] total 292 [2022-04-06 10:17:40,135 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298221202] [2022-04-06 10:17:40,136 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 10:17:40,136 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 292 states [2022-04-06 10:17:40,136 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:17:40,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 292 interpolants. [2022-04-06 10:17:40,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38347, Invalid=46625, Unknown=0, NotChecked=0, Total=84972 [2022-04-06 10:17:40,145 INFO L87 Difference]: Start difference. First operand 578 states and 583 transitions. Second operand has 292 states, 292 states have (on average 2.0136986301369864) internal successors, (588), 291 states have internal predecessors, (588), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:18:02,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:18:02,420 INFO L93 Difference]: Finished difference Result 618 states and 640 transitions. [2022-04-06 10:18:02,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 291 states. [2022-04-06 10:18:02,420 INFO L78 Accepts]: Start accepts. Automaton has has 292 states, 292 states have (on average 2.0136986301369864) internal successors, (588), 291 states have internal predecessors, (588), 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 569 [2022-04-06 10:18:02,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:18:02,437 INFO L225 Difference]: With dead ends: 618 [2022-04-06 10:18:02,437 INFO L226 Difference]: Without dead ends: 594 [2022-04-06 10:18:02,450 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 1704 GetRequests, 1126 SyntacticMatches, 0 SemanticMatches, 578 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45809 ImplicationChecksByTransitivity, 37.7s TimeCoverageRelationStatistics Valid=121338, Invalid=214482, Unknown=0, NotChecked=0, Total=335820 [2022-04-06 10:18:02,450 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 1676 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 792 mSolverCounterSat, 1419 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1677 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 2211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1419 IncrementalHoareTripleChecker+Valid, 792 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-04-06 10:18:02,451 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [1677 Valid, 86 Invalid, 2211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1419 Valid, 792 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-04-06 10:18:02,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 594 states. [2022-04-06 10:18:02,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 594 to 588. [2022-04-06 10:18:02,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 588 states, 579 states have (on average 1.0103626943005182) internal successors, (585), 581 states have internal predecessors, (585), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-06 10:18:02,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 588 states to 588 states and 593 transitions. [2022-04-06 10:18:02,478 INFO L78 Accepts]: Start accepts. Automaton has 588 states and 593 transitions. Word has length 569 [2022-04-06 10:18:02,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:18:02,479 INFO L478 AbstractCegarLoop]: Abstraction has 588 states and 593 transitions. [2022-04-06 10:18:02,479 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 292 states, 292 states have (on average 2.0136986301369864) internal successors, (588), 291 states have internal predecessors, (588), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:18:02,479 INFO L276 IsEmpty]: Start isEmpty. Operand 588 states and 593 transitions. [2022-04-06 10:18:02,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 580 [2022-04-06 10:18:02,485 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:18:02,485 INFO L499 BasicCegarLoop]: trace histogram [277, 275, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:18:02,517 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-04-06 10:18:02,686 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-04-06 10:18:02,686 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:18:02,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:18:02,686 INFO L85 PathProgramCache]: Analyzing trace with hash -615378920, now seen corresponding path program 10 times [2022-04-06 10:18:02,686 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:18:02,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [647252719] [2022-04-06 10:18:02,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:18:02,687 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:18:02,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:18:18,094 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:18:18,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:18:18,102 INFO L134 CoverageAnalysis]: Checked inductivity of 76820 backedges. 828 proven. 75900 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-04-06 10:18:18,102 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:18:18,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [647252719] [2022-04-06 10:18:18,102 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [647252719] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 10:18:18,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [315247361] [2022-04-06 10:18:18,102 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 10:18:18,102 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:18:18,102 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:18:18,103 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 10:18:18,104 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-04-06 10:18:18,257 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 10:18:18,257 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 10:18:18,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 1259 conjuncts, 277 conjunts are in the unsatisfiable core [2022-04-06 10:18:18,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 10:18:18,984 INFO L134 CoverageAnalysis]: Checked inductivity of 76820 backedges. 828 proven. 75900 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-04-06 10:18:18,984 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 10:19:04,826 INFO L134 CoverageAnalysis]: Checked inductivity of 76820 backedges. 828 proven. 75900 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-04-06 10:19:04,826 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [315247361] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 10:19:04,827 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 10:19:04,827 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [279, 278, 278] total 556 [2022-04-06 10:19:04,827 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1303600843] [2022-04-06 10:19:04,827 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 10:19:04,828 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 556 states [2022-04-06 10:19:04,828 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:19:04,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 556 interpolants. [2022-04-06 10:19:04,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153737, Invalid=154843, Unknown=0, NotChecked=0, Total=308580 [2022-04-06 10:19:04,857 INFO L87 Difference]: Start difference. First operand 588 states and 593 transitions. Second operand has 556 states, 556 states have (on average 2.014388489208633) internal successors, (1120), 555 states have internal predecessors, (1120), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:20:16,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:20:16,221 INFO L93 Difference]: Finished difference Result 1174 states and 1461 transitions. [2022-04-06 10:20:16,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 555 states. [2022-04-06 10:20:16,223 INFO L78 Accepts]: Start accepts. Automaton has has 556 states, 556 states have (on average 2.014388489208633) internal successors, (1120), 555 states have internal predecessors, (1120), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 579 [2022-04-06 10:20:16,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:20:16,226 INFO L225 Difference]: With dead ends: 1174 [2022-04-06 10:20:16,226 INFO L226 Difference]: Without dead ends: 1142 [2022-04-06 10:20:16,285 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 1989 GetRequests, 883 SyntacticMatches, 0 SemanticMatches, 1106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191676 ImplicationChecksByTransitivity, 123.5s TimeCoverageRelationStatistics Valid=460098, Invalid=766458, Unknown=0, NotChecked=0, Total=1226556 [2022-04-06 10:20:16,286 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 564 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 1170 mSolverCounterSat, 839 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 565 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 2009 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 839 IncrementalHoareTripleChecker+Valid, 1170 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-04-06 10:20:16,286 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [565 Valid, 44 Invalid, 2009 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [839 Valid, 1170 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-04-06 10:20:16,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1142 states. [2022-04-06 10:20:16,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1142 to 1142. [2022-04-06 10:20:16,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1142 states, 1133 states have (on average 1.0052956751985878) internal successors, (1139), 1135 states have internal predecessors, (1139), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-06 10:20:16,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1142 states to 1142 states and 1147 transitions. [2022-04-06 10:20:16,325 INFO L78 Accepts]: Start accepts. Automaton has 1142 states and 1147 transitions. Word has length 579 [2022-04-06 10:20:16,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:20:16,326 INFO L478 AbstractCegarLoop]: Abstraction has 1142 states and 1147 transitions. [2022-04-06 10:20:16,327 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 556 states, 556 states have (on average 2.014388489208633) internal successors, (1120), 555 states have internal predecessors, (1120), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:20:16,327 INFO L276 IsEmpty]: Start isEmpty. Operand 1142 states and 1147 transitions. [2022-04-06 10:20:16,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1134 [2022-04-06 10:20:16,334 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:20:16,335 INFO L499 BasicCegarLoop]: trace histogram [554, 552, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:20:16,353 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-04-06 10:20:16,553 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-04-06 10:20:16,553 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:20:16,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:20:16,554 INFO L85 PathProgramCache]: Analyzing trace with hash -1397632252, now seen corresponding path program 11 times [2022-04-06 10:20:16,554 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:20:16,556 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1787155530] [2022-04-06 10:20:16,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:20:16,557 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:20:17,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:21:18,446 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 10:21:18,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 10:21:18,467 INFO L134 CoverageAnalysis]: Checked inductivity of 307007 backedges. 1659 proven. 305256 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-04-06 10:21:18,467 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 10:21:18,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1787155530] [2022-04-06 10:21:18,467 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1787155530] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 10:21:18,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1979666713] [2022-04-06 10:21:18,467 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-04-06 10:21:18,467 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 10:21:18,467 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 10:21:18,468 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 10:21:18,469 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-04-06 10:21:20,295 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 555 check-sat command(s) [2022-04-06 10:21:20,295 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 10:21:20,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 2367 conjuncts, 554 conjunts are in the unsatisfiable core [2022-04-06 10:21:20,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 10:21:22,297 INFO L134 CoverageAnalysis]: Checked inductivity of 307007 backedges. 1659 proven. 305256 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-04-06 10:21:22,297 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 10:24:27,289 INFO L134 CoverageAnalysis]: Checked inductivity of 307007 backedges. 1659 proven. 305256 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-04-06 10:24:27,289 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1979666713] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 10:24:27,289 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 10:24:27,290 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [556, 555, 555] total 1110 [2022-04-06 10:24:27,290 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586122380] [2022-04-06 10:24:27,290 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 10:24:27,292 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 1110 states [2022-04-06 10:24:27,292 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 10:24:27,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 1110 interpolants. [2022-04-06 10:24:27,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=614388, Invalid=616602, Unknown=0, NotChecked=0, Total=1230990 [2022-04-06 10:24:27,430 INFO L87 Difference]: Start difference. First operand 1142 states and 1147 transitions. Second operand has 1110 states, 1110 states have (on average 2.007207207207207) internal successors, (2228), 1109 states have internal predecessors, (2228), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:30:28,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 10:30:28,280 INFO L93 Difference]: Finished difference Result 2282 states and 2846 transitions. [2022-04-06 10:30:28,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 1109 states. [2022-04-06 10:30:28,282 INFO L78 Accepts]: Start accepts. Automaton has has 1110 states, 1110 states have (on average 2.007207207207207) internal successors, (2228), 1109 states have internal predecessors, (2228), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 1133 [2022-04-06 10:30:28,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 10:30:28,288 INFO L225 Difference]: With dead ends: 2282 [2022-04-06 10:30:28,288 INFO L226 Difference]: Without dead ends: 2250 [2022-04-06 10:30:28,808 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 3928 GetRequests, 1714 SyntacticMatches, 0 SemanticMatches, 2214 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 767005 ImplicationChecksByTransitivity, 538.2s TimeCoverageRelationStatistics Valid=1840943, Invalid=3067497, Unknown=0, NotChecked=0, Total=4908440 [2022-04-06 10:30:28,810 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 1118 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 2266 mSolverCounterSat, 1669 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1119 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 3935 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1669 IncrementalHoareTripleChecker+Valid, 2266 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-04-06 10:30:28,812 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [1119 Valid, 39 Invalid, 3935 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1669 Valid, 2266 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-04-06 10:30:28,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2250 states. [2022-04-06 10:30:28,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2250 to 2250. [2022-04-06 10:30:28,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2250 states, 2241 states have (on average 1.002677376171352) internal successors, (2247), 2243 states have internal predecessors, (2247), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-06 10:30:28,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2250 states to 2250 states and 2255 transitions. [2022-04-06 10:30:28,894 INFO L78 Accepts]: Start accepts. Automaton has 2250 states and 2255 transitions. Word has length 1133 [2022-04-06 10:30:28,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 10:30:28,895 INFO L478 AbstractCegarLoop]: Abstraction has 2250 states and 2255 transitions. [2022-04-06 10:30:28,896 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 1110 states, 1110 states have (on average 2.007207207207207) internal successors, (2228), 1109 states have internal predecessors, (2228), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 10:30:28,896 INFO L276 IsEmpty]: Start isEmpty. Operand 2250 states and 2255 transitions. [2022-04-06 10:30:28,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2242 [2022-04-06 10:30:28,922 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 10:30:28,922 INFO L499 BasicCegarLoop]: trace histogram [1108, 1106, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 10:30:28,944 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-04-06 10:30:29,139 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,SelfDestructingSolverStorable14 [2022-04-06 10:30:29,139 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 10:30:29,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 10:30:29,140 INFO L85 PathProgramCache]: Analyzing trace with hash -35658788, now seen corresponding path program 12 times [2022-04-06 10:30:29,140 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 10:30:29,140 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [675467513] [2022-04-06 10:30:29,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 10:30:29,140 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 10:30:33,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat