/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/watermelon.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-05ce600 [2022-02-24 01:43:28,079 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-02-24 01:43:28,105 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-02-24 01:43:28,146 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-02-24 01:43:28,146 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-02-24 01:43:28,149 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-02-24 01:43:28,151 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-02-24 01:43:28,152 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-02-24 01:43:28,153 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-02-24 01:43:28,153 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-02-24 01:43:28,154 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-02-24 01:43:28,154 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-02-24 01:43:28,154 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-02-24 01:43:28,155 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-02-24 01:43:28,156 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-02-24 01:43:28,156 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-02-24 01:43:28,157 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-02-24 01:43:28,157 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-02-24 01:43:28,158 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-02-24 01:43:28,162 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-02-24 01:43:28,167 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-02-24 01:43:28,171 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-02-24 01:43:28,174 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-02-24 01:43:28,175 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-02-24 01:43:28,177 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-02-24 01:43:28,178 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-02-24 01:43:28,178 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-02-24 01:43:28,178 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-02-24 01:43:28,178 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-02-24 01:43:28,179 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-02-24 01:43:28,179 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-02-24 01:43:28,180 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-02-24 01:43:28,180 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-02-24 01:43:28,180 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-02-24 01:43:28,181 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-02-24 01:43:28,181 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-02-24 01:43:28,181 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-02-24 01:43:28,182 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-02-24 01:43:28,182 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-02-24 01:43:28,182 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-02-24 01:43:28,183 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-02-24 01:43:28,186 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2022-02-24 01:43:28,194 INFO L113 SettingsManager]: Loading preferences was successful [2022-02-24 01:43:28,195 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-02-24 01:43:28,196 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-02-24 01:43:28,196 INFO L138 SettingsManager]: * sizeof long=4 [2022-02-24 01:43:28,196 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-02-24 01:43:28,196 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-02-24 01:43:28,196 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-02-24 01:43:28,196 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-02-24 01:43:28,196 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-02-24 01:43:28,196 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-02-24 01:43:28,197 INFO L138 SettingsManager]: * sizeof long double=12 [2022-02-24 01:43:28,197 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-02-24 01:43:28,197 INFO L138 SettingsManager]: * Use constant arrays=true [2022-02-24 01:43:28,197 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-02-24 01:43:28,197 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-02-24 01:43:28,197 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-02-24 01:43:28,198 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-02-24 01:43:28,198 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-02-24 01:43:28,198 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-02-24 01:43:28,198 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-02-24 01:43:28,198 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2022-02-24 01:43:28,198 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-02-24 01:43:28,198 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-02-24 01:43:28,198 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-02-24 01:43:28,389 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-02-24 01:43:28,409 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-02-24 01:43:28,411 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-02-24 01:43:28,412 INFO L271 PluginConnector]: Initializing CDTParser... [2022-02-24 01:43:28,414 INFO L275 PluginConnector]: CDTParser initialized [2022-02-24 01:43:28,414 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/watermelon.c [2022-02-24 01:43:28,477 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b875ee36a/17332470c69a4f1c8bd67f3ed49ddb77/FLAG60bd19ab5 [2022-02-24 01:43:28,923 INFO L306 CDTParser]: Found 1 translation units. [2022-02-24 01:43:28,923 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/watermelon.c [2022-02-24 01:43:28,937 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b875ee36a/17332470c69a4f1c8bd67f3ed49ddb77/FLAG60bd19ab5 [2022-02-24 01:43:28,949 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b875ee36a/17332470c69a4f1c8bd67f3ed49ddb77 [2022-02-24 01:43:28,951 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-02-24 01:43:28,952 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-02-24 01:43:28,955 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-02-24 01:43:28,955 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-02-24 01:43:28,957 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-02-24 01:43:28,958 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.02 01:43:28" (1/1) ... [2022-02-24 01:43:28,959 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@21ae747f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 01:43:28, skipping insertion in model container [2022-02-24 01:43:28,959 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.02 01:43:28" (1/1) ... [2022-02-24 01:43:28,964 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-02-24 01:43:28,976 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-02-24 01:43:29,091 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/watermelon.c[373,386] [2022-02-24 01:43:29,113 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-02-24 01:43:29,120 INFO L203 MainTranslator]: Completed pre-run [2022-02-24 01:43:29,130 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/watermelon.c[373,386] [2022-02-24 01:43:29,144 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-02-24 01:43:29,156 INFO L208 MainTranslator]: Completed translation [2022-02-24 01:43:29,157 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 01:43:29 WrapperNode [2022-02-24 01:43:29,157 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-02-24 01:43:29,157 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-02-24 01:43:29,158 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-02-24 01:43:29,158 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-02-24 01:43:29,168 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 01:43:29" (1/1) ... [2022-02-24 01:43:29,169 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 01:43:29" (1/1) ... [2022-02-24 01:43:29,175 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 01:43:29" (1/1) ... [2022-02-24 01:43:29,175 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 01:43:29" (1/1) ... [2022-02-24 01:43:29,179 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 01:43:29" (1/1) ... [2022-02-24 01:43:29,183 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 01:43:29" (1/1) ... [2022-02-24 01:43:29,184 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 01:43:29" (1/1) ... [2022-02-24 01:43:29,185 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-02-24 01:43:29,186 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-02-24 01:43:29,186 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-02-24 01:43:29,186 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-02-24 01:43:29,187 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 01:43:29" (1/1) ... [2022-02-24 01:43:29,192 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-02-24 01:43:29,200 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-24 01:43:29,232 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) [2022-02-24 01:43:29,240 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 [2022-02-24 01:43:29,260 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-02-24 01:43:29,260 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-02-24 01:43:29,260 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-02-24 01:43:29,260 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-02-24 01:43:29,260 INFO L138 BoogieDeclarations]: Found implementation of procedure correct_version [2022-02-24 01:43:29,260 INFO L138 BoogieDeclarations]: Found implementation of procedure student_version [2022-02-24 01:43:29,261 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-02-24 01:43:29,261 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-02-24 01:43:29,261 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-02-24 01:43:29,261 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-02-24 01:43:29,261 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-02-24 01:43:29,261 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-02-24 01:43:29,261 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-02-24 01:43:29,261 INFO L130 BoogieDeclarations]: Found specification of procedure correct_version [2022-02-24 01:43:29,261 INFO L130 BoogieDeclarations]: Found specification of procedure student_version [2022-02-24 01:43:29,261 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-02-24 01:43:29,262 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-02-24 01:43:29,262 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-02-24 01:43:29,262 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-02-24 01:43:29,262 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-02-24 01:43:29,262 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-02-24 01:43:29,262 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-02-24 01:43:29,311 INFO L234 CfgBuilder]: Building ICFG [2022-02-24 01:43:29,313 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-02-24 01:43:29,428 INFO L275 CfgBuilder]: Performing block encoding [2022-02-24 01:43:29,433 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-02-24 01:43:29,433 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-02-24 01:43:29,434 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.02 01:43:29 BoogieIcfgContainer [2022-02-24 01:43:29,434 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-02-24 01:43:29,436 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-02-24 01:43:29,436 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-02-24 01:43:29,439 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-02-24 01:43:29,439 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.02 01:43:28" (1/3) ... [2022-02-24 01:43:29,440 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5fbda083 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.02 01:43:29, skipping insertion in model container [2022-02-24 01:43:29,440 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 01:43:29" (2/3) ... [2022-02-24 01:43:29,440 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5fbda083 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.02 01:43:29, skipping insertion in model container [2022-02-24 01:43:29,440 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.02 01:43:29" (3/3) ... [2022-02-24 01:43:29,441 INFO L111 eAbstractionObserver]: Analyzing ICFG watermelon.c [2022-02-24 01:43:29,445 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-02-24 01:43:29,445 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-02-24 01:43:29,476 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-02-24 01:43:29,481 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=AcceleratedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=JORDAN [2022-02-24 01:43:29,481 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-02-24 01:43:29,492 INFO L276 IsEmpty]: Start isEmpty. Operand has 39 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 29 states have internal predecessors, (38), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 01:43:29,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-02-24 01:43:29,497 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:43:29,497 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:43:29,498 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:43:29,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:43:29,501 INFO L85 PathProgramCache]: Analyzing trace with hash 345664661, now seen corresponding path program 1 times [2022-02-24 01:43:29,520 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:43:29,520 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [675781325] [2022-02-24 01:43:29,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:43:29,530 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:43:29,601 INFO L213 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-02-24 01:43:29,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:29,855 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:43:29,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:29,875 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:43:29,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:29,915 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2022-02-24 01:43:29,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:29,966 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:43:29,968 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:43:29,969 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [675781325] [2022-02-24 01:43:29,971 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [675781325] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:43:29,971 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:43:29,971 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-02-24 01:43:29,972 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800641465] [2022-02-24 01:43:29,973 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:43:29,978 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-02-24 01:43:29,978 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:43:30,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-02-24 01:43:30,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2022-02-24 01:43:30,011 INFO L87 Difference]: Start difference. First operand has 39 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 29 states have internal predecessors, (38), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 13 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 9 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:43:30,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:43:30,552 INFO L93 Difference]: Finished difference Result 91 states and 114 transitions. [2022-02-24 01:43:30,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-02-24 01:43:30,554 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 9 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 25 [2022-02-24 01:43:30,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:43:30,560 INFO L225 Difference]: With dead ends: 91 [2022-02-24 01:43:30,560 INFO L226 Difference]: Without dead ends: 42 [2022-02-24 01:43:30,563 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=85, Invalid=515, Unknown=0, NotChecked=0, Total=600 [2022-02-24 01:43:30,565 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 63 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 460 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 487 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 460 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-24 01:43:30,566 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 89 Invalid, 487 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 460 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-24 01:43:30,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-02-24 01:43:30,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2022-02-24 01:43:30,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 28 states have (on average 1.2142857142857142) internal successors, (34), 30 states have internal predecessors, (34), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-02-24 01:43:30,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2022-02-24 01:43:30,595 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 25 [2022-02-24 01:43:30,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:43:30,600 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2022-02-24 01:43:30,601 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 9 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:43:30,601 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2022-02-24 01:43:30,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-02-24 01:43:30,602 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:43:30,602 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:43:30,602 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-02-24 01:43:30,603 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:43:30,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:43:30,603 INFO L85 PathProgramCache]: Analyzing trace with hash -1324779677, now seen corresponding path program 1 times [2022-02-24 01:43:30,603 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:43:30,603 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [296525519] [2022-02-24 01:43:30,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:43:30,604 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:43:30,605 INFO L213 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-02-24 01:43:30,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:30,630 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:43:30,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:30,636 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:43:30,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:30,641 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2022-02-24 01:43:30,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:30,655 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:43:30,655 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:43:30,656 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [296525519] [2022-02-24 01:43:30,656 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [296525519] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:43:30,656 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:43:30,656 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-02-24 01:43:30,656 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671312705] [2022-02-24 01:43:30,656 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:43:30,657 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-02-24 01:43:30,657 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:43:30,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-02-24 01:43:30,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-02-24 01:43:30,658 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-02-24 01:43:30,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:43:30,708 INFO L93 Difference]: Finished difference Result 55 states and 63 transitions. [2022-02-24 01:43:30,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-02-24 01:43:30,709 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 27 [2022-02-24 01:43:30,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:43:30,710 INFO L225 Difference]: With dead ends: 55 [2022-02-24 01:43:30,710 INFO L226 Difference]: Without dead ends: 42 [2022-02-24 01:43:30,710 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-02-24 01:43:30,711 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 29 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-24 01:43:30,712 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 33 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-02-24 01:43:30,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-02-24 01:43:30,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2022-02-24 01:43:30,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 29 states have (on average 1.206896551724138) internal successors, (35), 31 states have internal predecessors, (35), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-02-24 01:43:30,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 47 transitions. [2022-02-24 01:43:30,720 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 47 transitions. Word has length 27 [2022-02-24 01:43:30,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:43:30,721 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 47 transitions. [2022-02-24 01:43:30,721 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-02-24 01:43:30,721 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 47 transitions. [2022-02-24 01:43:30,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-02-24 01:43:30,722 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:43:30,722 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:43:30,722 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-02-24 01:43:30,722 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:43:30,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:43:30,723 INFO L85 PathProgramCache]: Analyzing trace with hash -855151641, now seen corresponding path program 1 times [2022-02-24 01:43:30,723 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:43:30,723 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1284863350] [2022-02-24 01:43:30,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:43:30,724 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:43:30,725 INFO L213 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-02-24 01:43:30,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:30,748 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:43:30,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:30,753 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:43:30,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:30,765 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-02-24 01:43:30,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:30,770 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:43:30,770 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:43:30,770 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1284863350] [2022-02-24 01:43:30,770 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1284863350] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:43:30,770 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:43:30,770 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-02-24 01:43:30,771 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476949010] [2022-02-24 01:43:30,771 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:43:30,771 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-02-24 01:43:30,771 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:43:30,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-02-24 01:43:30,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-02-24 01:43:30,772 INFO L87 Difference]: Start difference. First operand 41 states and 47 transitions. Second operand has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:43:30,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:43:30,828 INFO L93 Difference]: Finished difference Result 72 states and 83 transitions. [2022-02-24 01:43:30,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-02-24 01:43:30,829 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2022-02-24 01:43:30,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:43:30,830 INFO L225 Difference]: With dead ends: 72 [2022-02-24 01:43:30,830 INFO L226 Difference]: Without dead ends: 43 [2022-02-24 01:43:30,831 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-02-24 01:43:30,832 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 29 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-24 01:43:30,832 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 33 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-02-24 01:43:30,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-02-24 01:43:30,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2022-02-24 01:43:30,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.2) internal successors, (36), 32 states have internal predecessors, (36), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-02-24 01:43:30,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 48 transitions. [2022-02-24 01:43:30,841 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 48 transitions. Word has length 27 [2022-02-24 01:43:30,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:43:30,841 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 48 transitions. [2022-02-24 01:43:30,842 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:43:30,842 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 48 transitions. [2022-02-24 01:43:30,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-02-24 01:43:30,843 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:43:30,843 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:43:30,843 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-02-24 01:43:30,843 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:43:30,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:43:30,844 INFO L85 PathProgramCache]: Analyzing trace with hash 743790053, now seen corresponding path program 1 times [2022-02-24 01:43:30,844 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:43:30,844 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [785467505] [2022-02-24 01:43:30,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:43:30,845 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:43:30,952 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:43:30,953 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:43:30,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:31,007 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:43:31,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:31,016 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:43:31,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:31,043 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2022-02-24 01:43:31,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:31,099 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:43:31,297 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:43:31,297 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [785467505] [2022-02-24 01:43:31,297 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [785467505] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:43:31,297 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:43:31,298 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-02-24 01:43:31,298 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262501594] [2022-02-24 01:43:31,298 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:43:31,298 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-02-24 01:43:31,298 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:43:31,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-02-24 01:43:31,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2022-02-24 01:43:31,300 INFO L87 Difference]: Start difference. First operand 42 states and 48 transitions. Second operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:43:31,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:43:31,548 INFO L93 Difference]: Finished difference Result 56 states and 62 transitions. [2022-02-24 01:43:31,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-02-24 01:43:31,549 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2022-02-24 01:43:31,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:43:31,550 INFO L225 Difference]: With dead ends: 56 [2022-02-24 01:43:31,551 INFO L226 Difference]: Without dead ends: 45 [2022-02-24 01:43:31,551 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2022-02-24 01:43:31,559 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 51 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 18 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 01:43:31,560 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 58 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 240 Invalid, 0 Unknown, 18 Unchecked, 0.2s Time] [2022-02-24 01:43:31,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-02-24 01:43:31,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2022-02-24 01:43:31,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 32 states have internal predecessors, (35), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-02-24 01:43:31,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2022-02-24 01:43:31,573 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 29 [2022-02-24 01:43:31,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:43:31,573 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2022-02-24 01:43:31,573 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:43:31,573 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2022-02-24 01:43:31,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-02-24 01:43:31,574 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:43:31,574 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:43:31,574 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-02-24 01:43:31,574 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:43:31,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:43:31,575 INFO L85 PathProgramCache]: Analyzing trace with hash 198429957, now seen corresponding path program 1 times [2022-02-24 01:43:31,575 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:43:31,575 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1612058790] [2022-02-24 01:43:31,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:43:31,576 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:43:31,636 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:43:31,637 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:43:31,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:31,712 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:43:31,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:31,720 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:43:31,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:31,805 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:43:31,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:31,836 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:43:32,052 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:43:32,053 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1612058790] [2022-02-24 01:43:32,059 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1612058790] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:43:32,059 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:43:32,059 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-02-24 01:43:32,059 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [121657517] [2022-02-24 01:43:32,059 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:43:32,060 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-02-24 01:43:32,060 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:43:32,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-02-24 01:43:32,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2022-02-24 01:43:32,061 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:43:32,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:43:32,364 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2022-02-24 01:43:32,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-02-24 01:43:32,365 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2022-02-24 01:43:32,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:43:32,365 INFO L225 Difference]: With dead ends: 51 [2022-02-24 01:43:32,365 INFO L226 Difference]: Without dead ends: 42 [2022-02-24 01:43:32,366 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2022-02-24 01:43:32,367 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 65 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 178 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 198 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 178 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 6 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 01:43:32,367 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 51 Invalid, 198 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 178 Invalid, 0 Unknown, 6 Unchecked, 0.2s Time] [2022-02-24 01:43:32,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-02-24 01:43:32,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2022-02-24 01:43:32,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 32 states have internal predecessors, (34), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-02-24 01:43:32,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2022-02-24 01:43:32,375 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 29 [2022-02-24 01:43:32,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:43:32,376 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2022-02-24 01:43:32,376 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:43:32,376 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2022-02-24 01:43:32,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-02-24 01:43:32,377 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:43:32,377 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:43:32,377 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-02-24 01:43:32,377 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:43:32,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:43:32,378 INFO L85 PathProgramCache]: Analyzing trace with hash 1589989783, now seen corresponding path program 1 times [2022-02-24 01:43:32,378 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:43:32,378 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [100765050] [2022-02-24 01:43:32,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:43:32,378 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:43:32,414 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:43:32,415 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:43:32,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:32,433 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:43:32,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:32,436 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:43:32,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:32,440 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:43:32,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:32,453 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:43:32,467 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:43:32,467 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [100765050] [2022-02-24 01:43:32,467 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [100765050] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:43:32,467 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:43:32,467 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-02-24 01:43:32,467 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229226777] [2022-02-24 01:43:32,467 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:43:32,468 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-02-24 01:43:32,468 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:43:32,468 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-02-24 01:43:32,468 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-02-24 01:43:32,468 INFO L87 Difference]: Start difference. First operand 42 states and 46 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-02-24 01:43:32,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:43:32,565 INFO L93 Difference]: Finished difference Result 58 states and 64 transitions. [2022-02-24 01:43:32,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-02-24 01:43:32,566 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 33 [2022-02-24 01:43:32,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:43:32,567 INFO L225 Difference]: With dead ends: 58 [2022-02-24 01:43:32,567 INFO L226 Difference]: Without dead ends: 45 [2022-02-24 01:43:32,567 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2022-02-24 01:43:32,568 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 36 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-24 01:43:32,568 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 44 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-24 01:43:32,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-02-24 01:43:32,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2022-02-24 01:43:32,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 32 states have (on average 1.125) internal successors, (36), 34 states have internal predecessors, (36), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-02-24 01:43:32,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2022-02-24 01:43:32,574 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 33 [2022-02-24 01:43:32,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:43:32,574 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2022-02-24 01:43:32,575 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-02-24 01:43:32,575 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2022-02-24 01:43:32,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-02-24 01:43:32,575 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:43:32,576 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:43:32,576 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-02-24 01:43:32,576 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:43:32,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:43:32,576 INFO L85 PathProgramCache]: Analyzing trace with hash 1518564121, now seen corresponding path program 2 times [2022-02-24 01:43:32,576 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:43:32,576 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1901448501] [2022-02-24 01:43:32,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:43:32,577 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:43:32,614 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:43:32,615 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:43:32,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:32,650 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:43:32,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:32,654 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:43:32,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:32,719 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:43:32,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:32,780 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:43:35,076 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:43:35,076 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1901448501] [2022-02-24 01:43:35,076 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1901448501] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:43:35,076 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:43:35,076 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-02-24 01:43:35,077 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1925582754] [2022-02-24 01:43:35,077 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:43:35,077 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-02-24 01:43:35,077 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:43:35,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-02-24 01:43:35,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=391, Unknown=0, NotChecked=0, Total=462 [2022-02-24 01:43:35,078 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand has 20 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:43:35,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:43:35,346 INFO L93 Difference]: Finished difference Result 62 states and 68 transitions. [2022-02-24 01:43:35,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-02-24 01:43:35,347 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 35 [2022-02-24 01:43:35,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:43:35,348 INFO L225 Difference]: With dead ends: 62 [2022-02-24 01:43:35,348 INFO L226 Difference]: Without dead ends: 56 [2022-02-24 01:43:35,348 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 264 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=139, Invalid=853, Unknown=0, NotChecked=0, Total=992 [2022-02-24 01:43:35,349 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 59 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 272 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 364 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 73 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-24 01:43:35,349 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 77 Invalid, 364 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 272 Invalid, 0 Unknown, 73 Unchecked, 0.1s Time] [2022-02-24 01:43:35,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-02-24 01:43:35,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 47. [2022-02-24 01:43:35,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 37 states have internal predecessors, (41), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-02-24 01:43:35,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 53 transitions. [2022-02-24 01:43:35,370 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 53 transitions. Word has length 35 [2022-02-24 01:43:35,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:43:35,371 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 53 transitions. [2022-02-24 01:43:35,371 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:43:35,371 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 53 transitions. [2022-02-24 01:43:35,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-02-24 01:43:35,373 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:43:35,373 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:43:35,373 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-02-24 01:43:35,374 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:43:35,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:43:35,374 INFO L85 PathProgramCache]: Analyzing trace with hash 1057360469, now seen corresponding path program 1 times [2022-02-24 01:43:35,374 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:43:35,374 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1351972673] [2022-02-24 01:43:35,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:43:35,375 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:43:35,448 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:43:35,448 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:43:35,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:35,470 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:43:35,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:35,472 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:43:35,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:35,475 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:43:35,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:35,505 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:43:35,526 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:43:35,527 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1351972673] [2022-02-24 01:43:35,527 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1351972673] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:43:35,527 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:43:35,527 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-02-24 01:43:35,527 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1968124439] [2022-02-24 01:43:35,527 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:43:35,527 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-02-24 01:43:35,527 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:43:35,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-02-24 01:43:35,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2022-02-24 01:43:35,528 INFO L87 Difference]: Start difference. First operand 47 states and 53 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-02-24 01:43:35,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:43:35,690 INFO L93 Difference]: Finished difference Result 59 states and 64 transitions. [2022-02-24 01:43:35,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-02-24 01:43:35,691 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 35 [2022-02-24 01:43:35,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:43:35,692 INFO L225 Difference]: With dead ends: 59 [2022-02-24 01:43:35,692 INFO L226 Difference]: Without dead ends: 50 [2022-02-24 01:43:35,692 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2022-02-24 01:43:35,693 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 45 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-24 01:43:35,693 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 37 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-24 01:43:35,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-02-24 01:43:35,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2022-02-24 01:43:35,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 35 states have (on average 1.1428571428571428) internal successors, (40), 37 states have internal predecessors, (40), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-02-24 01:43:35,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 52 transitions. [2022-02-24 01:43:35,702 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 52 transitions. Word has length 35 [2022-02-24 01:43:35,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:43:35,703 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 52 transitions. [2022-02-24 01:43:35,703 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-02-24 01:43:35,703 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 52 transitions. [2022-02-24 01:43:35,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-02-24 01:43:35,704 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:43:35,704 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:43:35,704 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-02-24 01:43:35,704 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:43:35,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:43:35,704 INFO L85 PathProgramCache]: Analyzing trace with hash 1737418839, now seen corresponding path program 1 times [2022-02-24 01:43:35,704 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:43:35,704 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1166748847] [2022-02-24 01:43:35,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:43:35,705 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:43:35,755 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:43:35,755 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:43:35,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:35,813 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:43:35,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:35,819 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:43:35,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:35,841 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:43:35,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:35,868 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:43:35,905 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:43:35,905 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1166748847] [2022-02-24 01:43:35,905 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1166748847] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:43:35,906 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:43:35,906 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-02-24 01:43:35,906 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2051424491] [2022-02-24 01:43:35,906 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:43:35,906 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-02-24 01:43:35,906 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:43:35,907 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-02-24 01:43:35,907 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2022-02-24 01:43:35,907 INFO L87 Difference]: Start difference. First operand 47 states and 52 transitions. Second operand has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:43:36,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:43:36,254 INFO L93 Difference]: Finished difference Result 58 states and 62 transitions. [2022-02-24 01:43:36,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-02-24 01:43:36,254 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 35 [2022-02-24 01:43:36,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:43:36,255 INFO L225 Difference]: With dead ends: 58 [2022-02-24 01:43:36,255 INFO L226 Difference]: Without dead ends: 48 [2022-02-24 01:43:36,256 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=102, Invalid=600, Unknown=0, NotChecked=0, Total=702 [2022-02-24 01:43:36,256 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 39 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 391 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 417 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 391 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 01:43:36,257 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 73 Invalid, 417 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 391 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 01:43:36,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-02-24 01:43:36,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2022-02-24 01:43:36,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 36 states have internal predecessors, (38), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2022-02-24 01:43:36,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2022-02-24 01:43:36,266 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 35 [2022-02-24 01:43:36,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:43:36,266 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2022-02-24 01:43:36,267 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:43:36,267 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2022-02-24 01:43:36,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-02-24 01:43:36,267 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:43:36,267 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:43:36,267 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-02-24 01:43:36,268 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:43:36,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:43:36,268 INFO L85 PathProgramCache]: Analyzing trace with hash 1597979675, now seen corresponding path program 3 times [2022-02-24 01:43:36,268 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:43:36,268 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1810970805] [2022-02-24 01:43:36,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:43:36,269 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:43:36,316 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:43:36,317 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:43:36,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:36,366 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:43:36,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:36,371 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:43:36,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:36,476 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:43:36,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:36,574 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:43:53,606 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:43:53,607 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1810970805] [2022-02-24 01:43:53,607 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1810970805] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:43:53,607 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:43:53,607 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-02-24 01:43:53,607 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876048005] [2022-02-24 01:43:53,607 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:43:53,607 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-02-24 01:43:53,607 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:43:53,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-02-24 01:43:53,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=433, Unknown=5, NotChecked=0, Total=506 [2022-02-24 01:43:53,608 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand has 21 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 19 states have internal predecessors, (29), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:43:59,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:43:59,251 INFO L93 Difference]: Finished difference Result 75 states and 83 transitions. [2022-02-24 01:43:59,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-02-24 01:43:59,252 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 19 states have internal predecessors, (29), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 37 [2022-02-24 01:43:59,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:43:59,252 INFO L225 Difference]: With dead ends: 75 [2022-02-24 01:43:59,252 INFO L226 Difference]: Without dead ends: 69 [2022-02-24 01:43:59,253 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 291 ImplicationChecksByTransitivity, 19.9s TimeCoverageRelationStatistics Valid=143, Invalid=1041, Unknown=6, NotChecked=0, Total=1190 [2022-02-24 01:43:59,253 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 69 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 385 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 473 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 385 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 68 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-02-24 01:43:59,253 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 89 Invalid, 473 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 385 Invalid, 0 Unknown, 68 Unchecked, 0.8s Time] [2022-02-24 01:43:59,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-02-24 01:43:59,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 60. [2022-02-24 01:43:59,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 45 states have (on average 1.1777777777777778) internal successors, (53), 49 states have internal predecessors, (53), 7 states have call successors, (7), 5 states have call predecessors, (7), 7 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-02-24 01:43:59,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 68 transitions. [2022-02-24 01:43:59,264 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 68 transitions. Word has length 37 [2022-02-24 01:43:59,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:43:59,264 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 68 transitions. [2022-02-24 01:43:59,264 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 19 states have internal predecessors, (29), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:43:59,264 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 68 transitions. [2022-02-24 01:43:59,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-02-24 01:43:59,264 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:43:59,264 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:43:59,265 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-02-24 01:43:59,265 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:43:59,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:43:59,265 INFO L85 PathProgramCache]: Analyzing trace with hash 783907799, now seen corresponding path program 2 times [2022-02-24 01:43:59,265 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:43:59,265 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1204259948] [2022-02-24 01:43:59,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:43:59,265 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:43:59,347 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:43:59,348 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:43:59,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:59,446 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:43:59,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:59,450 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:43:59,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:43:59,650 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:43:59,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:44:00,137 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:44:09,050 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:44:09,050 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1204259948] [2022-02-24 01:44:09,050 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1204259948] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:44:09,050 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:44:09,050 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-02-24 01:44:09,050 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781873930] [2022-02-24 01:44:09,050 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:44:09,051 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-02-24 01:44:09,051 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:44:09,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-02-24 01:44:09,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=473, Unknown=4, NotChecked=0, Total=552 [2022-02-24 01:44:09,051 INFO L87 Difference]: Start difference. First operand 60 states and 68 transitions. Second operand has 22 states, 20 states have (on average 1.45) internal successors, (29), 20 states have internal predecessors, (29), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:44:12,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:44:12,884 INFO L93 Difference]: Finished difference Result 71 states and 79 transitions. [2022-02-24 01:44:12,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-02-24 01:44:12,886 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 20 states have (on average 1.45) internal successors, (29), 20 states have internal predecessors, (29), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 37 [2022-02-24 01:44:12,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:44:12,887 INFO L225 Difference]: With dead ends: 71 [2022-02-24 01:44:12,887 INFO L226 Difference]: Without dead ends: 60 [2022-02-24 01:44:12,888 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 334 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=178, Invalid=1149, Unknown=5, NotChecked=0, Total=1332 [2022-02-24 01:44:12,888 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 57 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 330 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 445 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 330 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 101 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-02-24 01:44:12,888 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 80 Invalid, 445 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 330 Invalid, 0 Unknown, 101 Unchecked, 0.7s Time] [2022-02-24 01:44:12,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-02-24 01:44:12,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2022-02-24 01:44:12,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 49 states have internal predecessors, (52), 7 states have call successors, (7), 5 states have call predecessors, (7), 7 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-02-24 01:44:12,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 67 transitions. [2022-02-24 01:44:12,902 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 67 transitions. Word has length 37 [2022-02-24 01:44:12,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:44:12,902 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 67 transitions. [2022-02-24 01:44:12,902 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 20 states have (on average 1.45) internal successors, (29), 20 states have internal predecessors, (29), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:44:12,903 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 67 transitions. [2022-02-24 01:44:12,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-02-24 01:44:12,903 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:44:12,904 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:44:12,904 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-02-24 01:44:12,904 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:44:12,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:44:12,904 INFO L85 PathProgramCache]: Analyzing trace with hash 606915741, now seen corresponding path program 4 times [2022-02-24 01:44:12,904 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:44:12,904 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1439154102] [2022-02-24 01:44:12,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:44:12,905 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:44:13,053 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:44:13,053 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:44:13,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:44:13,181 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:44:13,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:44:13,187 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:44:13,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:44:13,494 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:44:13,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:44:14,043 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:44:20,995 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:44:20,995 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1439154102] [2022-02-24 01:44:20,995 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1439154102] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:44:20,995 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:44:20,995 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-02-24 01:44:20,995 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [624964644] [2022-02-24 01:44:20,995 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:44:20,995 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-02-24 01:44:20,996 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:44:20,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-02-24 01:44:20,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=477, Unknown=3, NotChecked=0, Total=552 [2022-02-24 01:44:20,996 INFO L87 Difference]: Start difference. First operand 60 states and 67 transitions. Second operand has 22 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:44:24,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:44:24,565 INFO L93 Difference]: Finished difference Result 81 states and 90 transitions. [2022-02-24 01:44:24,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-02-24 01:44:24,566 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 39 [2022-02-24 01:44:24,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:44:24,567 INFO L225 Difference]: With dead ends: 81 [2022-02-24 01:44:24,567 INFO L226 Difference]: Without dead ends: 72 [2022-02-24 01:44:24,567 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 288 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=143, Invalid=1113, Unknown=4, NotChecked=0, Total=1260 [2022-02-24 01:44:24,568 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 68 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 341 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 417 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 341 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 55 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-02-24 01:44:24,568 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 64 Invalid, 417 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 341 Invalid, 0 Unknown, 55 Unchecked, 0.8s Time] [2022-02-24 01:44:24,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-02-24 01:44:24,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 63. [2022-02-24 01:44:24,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 48 states have (on average 1.1666666666666667) internal successors, (56), 52 states have internal predecessors, (56), 7 states have call successors, (7), 5 states have call predecessors, (7), 7 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-02-24 01:44:24,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 71 transitions. [2022-02-24 01:44:24,585 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 71 transitions. Word has length 39 [2022-02-24 01:44:24,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:44:24,585 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 71 transitions. [2022-02-24 01:44:24,585 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:44:24,586 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 71 transitions. [2022-02-24 01:44:24,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-02-24 01:44:24,586 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:44:24,586 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:44:24,586 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-02-24 01:44:24,586 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:44:24,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:44:24,587 INFO L85 PathProgramCache]: Analyzing trace with hash -1449963591, now seen corresponding path program 5 times [2022-02-24 01:44:24,587 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:44:24,587 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2143944291] [2022-02-24 01:44:24,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:44:24,588 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:44:24,688 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:44:24,689 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:44:24,786 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:44:24,787 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:44:24,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:44:24,889 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:44:24,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:44:24,893 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:44:24,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:44:25,173 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:44:25,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:44:25,587 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:44:36,802 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:44:36,802 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2143944291] [2022-02-24 01:44:36,802 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [2143944291] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:44:36,803 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:44:36,803 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-02-24 01:44:36,803 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319686627] [2022-02-24 01:44:36,803 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:44:36,803 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-02-24 01:44:36,803 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:44:36,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-02-24 01:44:36,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=513, Unknown=5, NotChecked=0, Total=600 [2022-02-24 01:44:36,804 INFO L87 Difference]: Start difference. First operand 63 states and 71 transitions. Second operand has 23 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 21 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:44:42,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:44:42,487 INFO L93 Difference]: Finished difference Result 74 states and 81 transitions. [2022-02-24 01:44:42,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-02-24 01:44:42,487 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 21 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 39 [2022-02-24 01:44:42,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:44:42,488 INFO L225 Difference]: With dead ends: 74 [2022-02-24 01:44:42,488 INFO L226 Difference]: Without dead ends: 65 [2022-02-24 01:44:42,489 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 16.4s TimeCoverageRelationStatistics Valid=157, Invalid=1168, Unknown=7, NotChecked=0, Total=1332 [2022-02-24 01:44:42,489 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 64 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 374 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 624 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 374 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 233 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-02-24 01:44:42,490 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 96 Invalid, 624 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 374 Invalid, 0 Unknown, 233 Unchecked, 0.9s Time] [2022-02-24 01:44:42,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-02-24 01:44:42,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 54. [2022-02-24 01:44:42,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 42 states have (on average 1.1666666666666667) internal successors, (49), 44 states have internal predecessors, (49), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2022-02-24 01:44:42,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 60 transitions. [2022-02-24 01:44:42,506 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 60 transitions. Word has length 39 [2022-02-24 01:44:42,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:44:42,506 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 60 transitions. [2022-02-24 01:44:42,506 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 21 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:44:42,507 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 60 transitions. [2022-02-24 01:44:42,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-02-24 01:44:42,507 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:44:42,507 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:44:42,507 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-02-24 01:44:42,507 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:44:42,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:44:42,508 INFO L85 PathProgramCache]: Analyzing trace with hash 2030931829, now seen corresponding path program 3 times [2022-02-24 01:44:42,508 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:44:42,508 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1368037338] [2022-02-24 01:44:42,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:44:42,508 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:44:42,652 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:44:42,653 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:44:42,781 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:44:42,782 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:44:42,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:44:42,905 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:44:42,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:44:42,911 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:44:42,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:44:43,271 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:44:43,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:44:43,867 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:45:05,807 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:45:05,807 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1368037338] [2022-02-24 01:45:05,807 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1368037338] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:45:05,807 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:45:05,807 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-02-24 01:45:05,808 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795492277] [2022-02-24 01:45:05,808 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:45:05,809 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-02-24 01:45:05,809 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:45:05,810 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-02-24 01:45:05,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=552, Unknown=10, NotChecked=0, Total=650 [2022-02-24 01:45:05,810 INFO L87 Difference]: Start difference. First operand 54 states and 60 transitions. Second operand has 24 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:45:11,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:45:11,457 INFO L93 Difference]: Finished difference Result 60 states and 65 transitions. [2022-02-24 01:45:11,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-02-24 01:45:11,458 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 39 [2022-02-24 01:45:11,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:45:11,458 INFO L225 Difference]: With dead ends: 60 [2022-02-24 01:45:11,458 INFO L226 Difference]: Without dead ends: 45 [2022-02-24 01:45:11,458 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 364 ImplicationChecksByTransitivity, 27.6s TimeCoverageRelationStatistics Valid=179, Invalid=1215, Unknown=12, NotChecked=0, Total=1406 [2022-02-24 01:45:11,459 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 47 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 40 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-02-24 01:45:11,459 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 83 Invalid, 341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 289 Invalid, 0 Unknown, 40 Unchecked, 0.7s Time] [2022-02-24 01:45:11,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-02-24 01:45:11,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2022-02-24 01:45:11,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 33 states have internal predecessors, (35), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-02-24 01:45:11,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2022-02-24 01:45:11,468 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 39 [2022-02-24 01:45:11,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:45:11,468 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2022-02-24 01:45:11,468 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:45:11,468 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2022-02-24 01:45:11,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-02-24 01:45:11,469 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:45:11,469 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:45:11,469 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-02-24 01:45:11,469 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:45:11,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:45:11,469 INFO L85 PathProgramCache]: Analyzing trace with hash 1677214879, now seen corresponding path program 6 times [2022-02-24 01:45:11,469 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:45:11,469 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1180370608] [2022-02-24 01:45:11,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:45:11,469 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:45:11,558 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:45:11,559 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:45:11,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:45:11,639 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:45:11,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:45:11,643 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:45:11,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:45:11,959 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:45:11,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:45:12,570 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:45:32,876 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:45:32,876 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1180370608] [2022-02-24 01:45:32,876 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1180370608] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:45:32,876 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:45:32,876 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-02-24 01:45:32,876 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599091175] [2022-02-24 01:45:32,876 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:45:32,876 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-02-24 01:45:32,877 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:45:32,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-02-24 01:45:32,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=521, Unknown=5, NotChecked=0, Total=600 [2022-02-24 01:45:32,877 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand has 23 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:45:41,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:45:41,708 INFO L93 Difference]: Finished difference Result 65 states and 69 transitions. [2022-02-24 01:45:41,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-02-24 01:45:41,708 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 41 [2022-02-24 01:45:41,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:45:41,709 INFO L225 Difference]: With dead ends: 65 [2022-02-24 01:45:41,709 INFO L226 Difference]: Without dead ends: 59 [2022-02-24 01:45:41,709 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 343 ImplicationChecksByTransitivity, 25.2s TimeCoverageRelationStatistics Valid=154, Invalid=1246, Unknown=6, NotChecked=0, Total=1406 [2022-02-24 01:45:41,710 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 63 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 442 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 516 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 442 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 51 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-02-24 01:45:41,710 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 81 Invalid, 516 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 442 Invalid, 0 Unknown, 51 Unchecked, 2.6s Time] [2022-02-24 01:45:41,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-02-24 01:45:41,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2022-02-24 01:45:41,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 44 states have (on average 1.0909090909090908) internal successors, (48), 46 states have internal predecessors, (48), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-02-24 01:45:41,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2022-02-24 01:45:41,727 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 41 [2022-02-24 01:45:41,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:45:41,728 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2022-02-24 01:45:41,728 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:45:41,728 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2022-02-24 01:45:41,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-02-24 01:45:41,729 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:45:41,729 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:45:41,729 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-02-24 01:45:41,729 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:45:41,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:45:41,729 INFO L85 PathProgramCache]: Analyzing trace with hash -557464543, now seen corresponding path program 7 times [2022-02-24 01:45:41,729 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:45:41,729 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1726757778] [2022-02-24 01:45:41,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:45:41,730 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:45:41,963 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:45:41,964 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:45:41,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:45:42,218 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:45:42,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:45:42,223 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:45:42,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:45:42,978 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:45:42,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:45:44,822 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:46:02,719 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:46:02,719 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1726757778] [2022-02-24 01:46:02,719 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1726757778] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:46:02,719 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:46:02,719 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-02-24 01:46:02,719 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178795578] [2022-02-24 01:46:02,719 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:46:02,720 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-02-24 01:46:02,720 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:46:02,720 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-02-24 01:46:02,720 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=568, Unknown=5, NotChecked=0, Total=650 [2022-02-24 01:46:02,720 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand has 24 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 22 states have internal predecessors, (35), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:46:12,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:46:12,355 INFO L93 Difference]: Finished difference Result 71 states and 76 transitions. [2022-02-24 01:46:12,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-02-24 01:46:12,356 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 22 states have internal predecessors, (35), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 43 [2022-02-24 01:46:12,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:46:12,356 INFO L225 Difference]: With dead ends: 71 [2022-02-24 01:46:12,356 INFO L226 Difference]: Without dead ends: 65 [2022-02-24 01:46:12,357 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 24.4s TimeCoverageRelationStatistics Valid=163, Invalid=1391, Unknown=6, NotChecked=0, Total=1560 [2022-02-24 01:46:12,357 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 71 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 557 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 682 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 557 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 100 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2022-02-24 01:46:12,357 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 98 Invalid, 682 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 557 Invalid, 0 Unknown, 100 Unchecked, 3.2s Time] [2022-02-24 01:46:12,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-02-24 01:46:12,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 58. [2022-02-24 01:46:12,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 46 states have (on average 1.108695652173913) internal successors, (51), 48 states have internal predecessors, (51), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-02-24 01:46:12,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 63 transitions. [2022-02-24 01:46:12,383 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 63 transitions. Word has length 43 [2022-02-24 01:46:12,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:46:12,383 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 63 transitions. [2022-02-24 01:46:12,383 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 22 states have internal predecessors, (35), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:46:12,384 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 63 transitions. [2022-02-24 01:46:12,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-02-24 01:46:12,384 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:46:12,384 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:46:12,384 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-02-24 01:46:12,384 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:46:12,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:46:12,384 INFO L85 PathProgramCache]: Analyzing trace with hash 2025675069, now seen corresponding path program 8 times [2022-02-24 01:46:12,384 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:46:12,384 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1722739135] [2022-02-24 01:46:12,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:46:12,385 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:46:12,753 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:46:12,753 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:46:12,981 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:46:12,981 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:46:12,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:46:13,184 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:46:13,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:46:13,187 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:46:13,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:46:14,001 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:46:14,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:46:15,632 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:46:57,831 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:46:57,831 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1722739135] [2022-02-24 01:46:57,831 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1722739135] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:46:57,831 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:46:57,831 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-02-24 01:46:57,831 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81948178] [2022-02-24 01:46:57,831 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:46:57,832 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-02-24 01:46:57,832 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:46:57,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-02-24 01:46:57,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=603, Unknown=15, NotChecked=0, Total=702 [2022-02-24 01:46:57,832 INFO L87 Difference]: Start difference. First operand 58 states and 63 transitions. Second operand has 25 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 23 states have internal predecessors, (35), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:47:08,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:47:08,922 INFO L93 Difference]: Finished difference Result 70 states and 74 transitions. [2022-02-24 01:47:08,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-02-24 01:47:08,922 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 23 states have internal predecessors, (35), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 43 [2022-02-24 01:47:08,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:47:08,923 INFO L225 Difference]: With dead ends: 70 [2022-02-24 01:47:08,923 INFO L226 Difference]: Without dead ends: 60 [2022-02-24 01:47:08,923 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 389 ImplicationChecksByTransitivity, 50.4s TimeCoverageRelationStatistics Valid=164, Invalid=1379, Unknown=17, NotChecked=0, Total=1560 [2022-02-24 01:47:08,924 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 55 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 452 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 675 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 452 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 203 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-02-24 01:47:08,924 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 129 Invalid, 675 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 452 Invalid, 0 Unknown, 203 Unchecked, 2.7s Time] [2022-02-24 01:47:08,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-02-24 01:47:08,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2022-02-24 01:47:08,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 46 states have (on average 1.0869565217391304) internal successors, (50), 48 states have internal predecessors, (50), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-02-24 01:47:08,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 62 transitions. [2022-02-24 01:47:08,940 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 62 transitions. Word has length 43 [2022-02-24 01:47:08,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:47:08,940 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 62 transitions. [2022-02-24 01:47:08,940 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 23 states have internal predecessors, (35), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:47:08,940 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 62 transitions. [2022-02-24 01:47:08,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-02-24 01:47:08,941 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:47:08,941 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:47:08,941 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-02-24 01:47:08,941 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:47:08,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:47:08,941 INFO L85 PathProgramCache]: Analyzing trace with hash -600741085, now seen corresponding path program 9 times [2022-02-24 01:47:08,941 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:47:08,941 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [997440261] [2022-02-24 01:47:08,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:47:08,941 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:47:09,273 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:47:09,273 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:47:09,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:47:09,529 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:47:09,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:47:09,534 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:47:09,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:47:10,351 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:47:10,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:47:12,542 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:47:34,783 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:47:34,784 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [997440261] [2022-02-24 01:47:34,784 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [997440261] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:47:34,784 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:47:34,784 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-02-24 01:47:34,784 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923905152] [2022-02-24 01:47:34,784 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:47:34,784 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-02-24 01:47:34,784 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:47:34,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-02-24 01:47:34,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=615, Unknown=7, NotChecked=0, Total=702 [2022-02-24 01:47:34,785 INFO L87 Difference]: Start difference. First operand 58 states and 62 transitions. Second operand has 25 states, 23 states have (on average 1.608695652173913) internal successors, (37), 23 states have internal predecessors, (37), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:47:44,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:47:44,827 INFO L93 Difference]: Finished difference Result 73 states and 78 transitions. [2022-02-24 01:47:44,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-02-24 01:47:44,827 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 1.608695652173913) internal successors, (37), 23 states have internal predecessors, (37), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 45 [2022-02-24 01:47:44,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:47:44,828 INFO L225 Difference]: With dead ends: 73 [2022-02-24 01:47:44,828 INFO L226 Difference]: Without dead ends: 67 [2022-02-24 01:47:44,828 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 419 ImplicationChecksByTransitivity, 29.5s TimeCoverageRelationStatistics Valid=172, Invalid=1542, Unknown=8, NotChecked=0, Total=1722 [2022-02-24 01:47:44,829 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 71 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 536 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 621 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 536 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 58 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2022-02-24 01:47:44,829 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 83 Invalid, 621 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 536 Invalid, 0 Unknown, 58 Unchecked, 3.2s Time] [2022-02-24 01:47:44,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-02-24 01:47:44,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 60. [2022-02-24 01:47:44,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 50 states have internal predecessors, (53), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-02-24 01:47:44,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 65 transitions. [2022-02-24 01:47:44,857 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 65 transitions. Word has length 45 [2022-02-24 01:47:44,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:47:44,857 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 65 transitions. [2022-02-24 01:47:44,857 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 23 states have (on average 1.608695652173913) internal successors, (37), 23 states have internal predecessors, (37), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:47:44,858 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 65 transitions. [2022-02-24 01:47:44,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-02-24 01:47:44,858 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:47:44,858 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:47:44,858 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2022-02-24 01:47:44,858 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:47:44,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:47:44,859 INFO L85 PathProgramCache]: Analyzing trace with hash -694671041, now seen corresponding path program 10 times [2022-02-24 01:47:44,859 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:47:44,859 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [32797793] [2022-02-24 01:47:44,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:47:44,859 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:47:45,095 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:47:45,096 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:47:45,504 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:47:45,505 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:47:45,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:47:45,715 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:47:45,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:47:45,718 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:47:45,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:47:46,593 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:47:46,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:47:48,583 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:48:31,429 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:48:31,430 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [32797793] [2022-02-24 01:48:31,430 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [32797793] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:48:31,430 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:48:31,430 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-02-24 01:48:31,430 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918164483] [2022-02-24 01:48:31,430 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:48:31,430 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-02-24 01:48:31,430 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:48:31,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-02-24 01:48:31,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=654, Unknown=15, NotChecked=0, Total=756 [2022-02-24 01:48:31,431 INFO L87 Difference]: Start difference. First operand 60 states and 65 transitions. Second operand has 26 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 24 states have internal predecessors, (37), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:48:43,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:48:43,614 INFO L93 Difference]: Finished difference Result 72 states and 76 transitions. [2022-02-24 01:48:43,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-02-24 01:48:43,615 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 24 states have internal predecessors, (37), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 45 [2022-02-24 01:48:43,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:48:43,615 INFO L225 Difference]: With dead ends: 72 [2022-02-24 01:48:43,615 INFO L226 Difference]: Without dead ends: 62 [2022-02-24 01:48:43,616 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 431 ImplicationChecksByTransitivity, 51.7s TimeCoverageRelationStatistics Valid=173, Invalid=1532, Unknown=17, NotChecked=0, Total=1722 [2022-02-24 01:48:43,616 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 56 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 587 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 761 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 587 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 152 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2022-02-24 01:48:43,616 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 126 Invalid, 761 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 587 Invalid, 0 Unknown, 152 Unchecked, 3.6s Time] [2022-02-24 01:48:43,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-02-24 01:48:43,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 60. [2022-02-24 01:48:43,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 48 states have (on average 1.0833333333333333) internal successors, (52), 50 states have internal predecessors, (52), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-02-24 01:48:43,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2022-02-24 01:48:43,634 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 45 [2022-02-24 01:48:43,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:48:43,634 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2022-02-24 01:48:43,635 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 24 states have internal predecessors, (37), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:48:43,635 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2022-02-24 01:48:43,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-02-24 01:48:43,635 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:48:43,635 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:48:43,635 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2022-02-24 01:48:43,635 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:48:43,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:48:43,636 INFO L85 PathProgramCache]: Analyzing trace with hash 760175013, now seen corresponding path program 11 times [2022-02-24 01:48:43,636 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:48:43,636 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1045142507] [2022-02-24 01:48:43,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:48:43,636 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:48:43,973 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:48:43,973 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:48:43,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:48:44,210 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:48:44,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:48:44,214 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:48:44,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:48:45,029 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:48:45,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:48:47,656 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:49:05,817 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:49:05,818 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1045142507] [2022-02-24 01:49:05,818 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1045142507] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:49:05,818 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:49:05,818 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-02-24 01:49:05,818 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1116075656] [2022-02-24 01:49:05,818 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:49:05,818 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-02-24 01:49:05,818 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:49:05,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-02-24 01:49:05,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=668, Unknown=5, NotChecked=0, Total=756 [2022-02-24 01:49:05,819 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand has 26 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:49:16,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:49:16,140 INFO L93 Difference]: Finished difference Result 75 states and 80 transitions. [2022-02-24 01:49:16,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-02-24 01:49:16,140 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 47 [2022-02-24 01:49:16,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:49:16,141 INFO L225 Difference]: With dead ends: 75 [2022-02-24 01:49:16,141 INFO L226 Difference]: Without dead ends: 69 [2022-02-24 01:49:16,142 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 459 ImplicationChecksByTransitivity, 25.9s TimeCoverageRelationStatistics Valid=181, Invalid=1705, Unknown=6, NotChecked=0, Total=1892 [2022-02-24 01:49:16,142 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 75 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 545 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 635 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 545 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 61 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2022-02-24 01:49:16,142 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 68 Invalid, 635 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 545 Invalid, 0 Unknown, 61 Unchecked, 3.2s Time] [2022-02-24 01:49:16,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-02-24 01:49:16,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 62. [2022-02-24 01:49:16,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 50 states have (on average 1.1) internal successors, (55), 52 states have internal predecessors, (55), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-02-24 01:49:16,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2022-02-24 01:49:16,167 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 47 [2022-02-24 01:49:16,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:49:16,168 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2022-02-24 01:49:16,168 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:49:16,168 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2022-02-24 01:49:16,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-02-24 01:49:16,168 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:49:16,168 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:49:16,168 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2022-02-24 01:49:16,169 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:49:16,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:49:16,169 INFO L85 PathProgramCache]: Analyzing trace with hash 687800513, now seen corresponding path program 12 times [2022-02-24 01:49:16,169 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:49:16,169 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2015746345] [2022-02-24 01:49:16,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:49:16,170 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:49:16,511 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:49:16,511 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:49:16,838 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:49:16,838 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:49:16,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:49:17,060 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:49:17,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:49:17,064 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:49:17,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:49:17,934 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:49:17,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:49:20,182 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:50:05,141 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:50:05,142 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2015746345] [2022-02-24 01:50:05,142 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [2015746345] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:50:05,142 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:50:05,142 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-02-24 01:50:05,142 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536007456] [2022-02-24 01:50:05,142 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:50:05,142 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-02-24 01:50:05,142 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:50:05,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-02-24 01:50:05,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=705, Unknown=17, NotChecked=0, Total=812 [2022-02-24 01:50:05,143 INFO L87 Difference]: Start difference. First operand 62 states and 67 transitions. Second operand has 27 states, 25 states have (on average 1.56) internal successors, (39), 25 states have internal predecessors, (39), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:50:17,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:50:17,355 INFO L93 Difference]: Finished difference Result 74 states and 78 transitions. [2022-02-24 01:50:17,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-02-24 01:50:17,355 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 25 states have (on average 1.56) internal successors, (39), 25 states have internal predecessors, (39), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 47 [2022-02-24 01:50:17,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:50:17,356 INFO L225 Difference]: With dead ends: 74 [2022-02-24 01:50:17,356 INFO L226 Difference]: Without dead ends: 64 [2022-02-24 01:50:17,357 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 473 ImplicationChecksByTransitivity, 54.4s TimeCoverageRelationStatistics Valid=182, Invalid=1691, Unknown=19, NotChecked=0, Total=1892 [2022-02-24 01:50:17,357 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 63 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 518 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 607 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 518 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 65 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2022-02-24 01:50:17,358 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 86 Invalid, 607 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 518 Invalid, 0 Unknown, 65 Unchecked, 3.2s Time] [2022-02-24 01:50:17,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-02-24 01:50:17,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 62. [2022-02-24 01:50:17,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 50 states have (on average 1.08) internal successors, (54), 52 states have internal predecessors, (54), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-02-24 01:50:17,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 66 transitions. [2022-02-24 01:50:17,391 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 66 transitions. Word has length 47 [2022-02-24 01:50:17,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:50:17,392 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 66 transitions. [2022-02-24 01:50:17,392 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 25 states have (on average 1.56) internal successors, (39), 25 states have internal predecessors, (39), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:50:17,392 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 66 transitions. [2022-02-24 01:50:17,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-02-24 01:50:17,392 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:50:17,392 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:50:17,392 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2022-02-24 01:50:17,393 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:50:17,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:50:17,393 INFO L85 PathProgramCache]: Analyzing trace with hash -1364480089, now seen corresponding path program 13 times [2022-02-24 01:50:17,393 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:50:17,393 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [740283695] [2022-02-24 01:50:17,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:50:17,394 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:50:17,685 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:50:17,686 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:50:17,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:50:17,983 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:50:17,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:50:17,987 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:50:17,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:50:18,785 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:50:18,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:50:21,646 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:50:29,570 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:50:29,570 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [740283695] [2022-02-24 01:50:29,570 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [740283695] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:50:29,570 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:50:29,570 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-02-24 01:50:29,570 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463702766] [2022-02-24 01:50:29,570 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:50:29,570 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-02-24 01:50:29,571 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:50:29,571 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-02-24 01:50:29,571 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=722, Unknown=3, NotChecked=0, Total=812 [2022-02-24 01:50:29,571 INFO L87 Difference]: Start difference. First operand 62 states and 66 transitions. Second operand has 27 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:50:38,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:50:38,885 INFO L93 Difference]: Finished difference Result 75 states and 80 transitions. [2022-02-24 01:50:38,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-02-24 01:50:38,886 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 49 [2022-02-24 01:50:38,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:50:38,886 INFO L225 Difference]: With dead ends: 75 [2022-02-24 01:50:38,886 INFO L226 Difference]: Without dead ends: 65 [2022-02-24 01:50:38,887 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 504 ImplicationChecksByTransitivity, 16.4s TimeCoverageRelationStatistics Valid=188, Invalid=1878, Unknown=4, NotChecked=0, Total=2070 [2022-02-24 01:50:38,888 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 66 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 613 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 699 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 613 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 58 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2022-02-24 01:50:38,888 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 87 Invalid, 699 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 613 Invalid, 0 Unknown, 58 Unchecked, 3.8s Time] [2022-02-24 01:50:38,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-02-24 01:50:38,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2022-02-24 01:50:38,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 52 states have (on average 1.0769230769230769) internal successors, (56), 54 states have internal predecessors, (56), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-02-24 01:50:38,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 68 transitions. [2022-02-24 01:50:38,920 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 68 transitions. Word has length 49 [2022-02-24 01:50:38,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:50:38,921 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 68 transitions. [2022-02-24 01:50:38,921 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:50:38,921 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 68 transitions. [2022-02-24 01:50:38,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-02-24 01:50:38,921 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:50:38,921 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:50:38,921 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2022-02-24 01:50:38,922 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:50:38,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:50:38,922 INFO L85 PathProgramCache]: Analyzing trace with hash 2098069443, now seen corresponding path program 14 times [2022-02-24 01:50:38,922 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:50:38,922 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [216607145] [2022-02-24 01:50:38,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:50:38,923 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:50:39,327 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:50:39,327 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:50:39,557 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:50:39,557 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:50:39,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:50:39,795 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:50:39,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:50:39,805 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:50:39,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:50:40,566 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:50:40,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:50:43,270 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:50:49,954 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:50:49,955 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [216607145] [2022-02-24 01:50:49,955 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [216607145] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:50:49,955 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:50:49,955 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-02-24 01:50:49,955 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146810014] [2022-02-24 01:50:49,955 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:50:49,955 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-02-24 01:50:49,955 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:50:49,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-02-24 01:50:49,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=771, Unknown=2, NotChecked=0, Total=870 [2022-02-24 01:50:49,956 INFO L87 Difference]: Start difference. First operand 64 states and 68 transitions. Second operand has 28 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:51:01,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:51:01,296 INFO L93 Difference]: Finished difference Result 72 states and 75 transitions. [2022-02-24 01:51:01,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-02-24 01:51:01,297 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 49 [2022-02-24 01:51:01,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:51:01,297 INFO L225 Difference]: With dead ends: 72 [2022-02-24 01:51:01,297 INFO L226 Difference]: Without dead ends: 62 [2022-02-24 01:51:01,298 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 16.7s TimeCoverageRelationStatistics Valid=195, Invalid=1871, Unknown=4, NotChecked=0, Total=2070 [2022-02-24 01:51:01,298 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 68 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 640 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 831 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 640 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 165 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2022-02-24 01:51:01,298 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 108 Invalid, 831 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 640 Invalid, 0 Unknown, 165 Unchecked, 4.0s Time] [2022-02-24 01:51:01,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-02-24 01:51:01,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 52. [2022-02-24 01:51:01,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 43 states have internal predecessors, (45), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-02-24 01:51:01,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2022-02-24 01:51:01,317 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 49 [2022-02-24 01:51:01,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:51:01,317 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2022-02-24 01:51:01,317 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:51:01,317 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2022-02-24 01:51:01,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-02-24 01:51:01,318 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:51:01,318 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:51:01,318 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2022-02-24 01:51:01,318 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:51:01,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:51:01,318 INFO L85 PathProgramCache]: Analyzing trace with hash 1246399785, now seen corresponding path program 15 times [2022-02-24 01:51:01,318 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:51:01,319 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1490131723] [2022-02-24 01:51:01,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:51:01,319 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:51:01,583 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:51:01,583 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:51:01,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:51:01,795 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:51:01,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:51:01,797 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:51:01,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:51:02,587 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:51:02,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:51:05,825 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:51:26,004 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:51:26,004 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1490131723] [2022-02-24 01:51:26,004 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1490131723] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:51:26,004 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:51:26,004 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-02-24 01:51:26,004 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604440556] [2022-02-24 01:51:26,005 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:51:26,005 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-02-24 01:51:26,005 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:51:26,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-02-24 01:51:26,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=776, Unknown=5, NotChecked=0, Total=870 [2022-02-24 01:51:26,005 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand has 28 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 26 states have internal predecessors, (43), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:51:38,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:51:38,210 INFO L93 Difference]: Finished difference Result 75 states and 79 transitions. [2022-02-24 01:51:38,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-02-24 01:51:38,211 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 26 states have internal predecessors, (43), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 51 [2022-02-24 01:51:38,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:51:38,211 INFO L225 Difference]: With dead ends: 75 [2022-02-24 01:51:38,211 INFO L226 Difference]: Without dead ends: 69 [2022-02-24 01:51:38,212 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 543 ImplicationChecksByTransitivity, 29.3s TimeCoverageRelationStatistics Valid=199, Invalid=2051, Unknown=6, NotChecked=0, Total=2256 [2022-02-24 01:51:38,212 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 73 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 677 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 820 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 677 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 110 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2022-02-24 01:51:38,212 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 91 Invalid, 820 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 677 Invalid, 0 Unknown, 110 Unchecked, 4.3s Time] [2022-02-24 01:51:38,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-02-24 01:51:38,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2022-02-24 01:51:38,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 54 states have (on average 1.0740740740740742) internal successors, (58), 56 states have internal predecessors, (58), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-02-24 01:51:38,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 70 transitions. [2022-02-24 01:51:38,250 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 70 transitions. Word has length 51 [2022-02-24 01:51:38,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:51:38,251 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 70 transitions. [2022-02-24 01:51:38,251 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 26 states have internal predecessors, (43), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:51:38,251 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 70 transitions. [2022-02-24 01:51:38,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-02-24 01:51:38,257 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:51:38,257 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:51:38,257 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2022-02-24 01:51:38,257 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:51:38,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:51:38,258 INFO L85 PathProgramCache]: Analyzing trace with hash 2041057835, now seen corresponding path program 16 times [2022-02-24 01:51:38,258 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:51:38,258 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1255308697] [2022-02-24 01:51:38,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:51:38,258 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:51:38,616 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:51:38,617 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:51:38,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:51:38,835 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:51:38,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:51:38,838 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:51:38,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:51:39,724 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:51:39,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:51:43,345 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:52:05,418 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:52:05,418 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1255308697] [2022-02-24 01:52:05,418 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1255308697] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:52:05,418 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:52:05,418 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-02-24 01:52:05,418 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750649785] [2022-02-24 01:52:05,419 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:52:05,419 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-02-24 01:52:05,419 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:52:05,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-02-24 01:52:05,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=831, Unknown=7, NotChecked=0, Total=930 [2022-02-24 01:52:05,420 INFO L87 Difference]: Start difference. First operand 66 states and 70 transitions. Second operand has 29 states, 27 states have (on average 1.6666666666666667) internal successors, (45), 27 states have internal predecessors, (45), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:52:18,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:52:18,974 INFO L93 Difference]: Finished difference Result 81 states and 86 transitions. [2022-02-24 01:52:18,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-02-24 01:52:18,975 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 27 states have (on average 1.6666666666666667) internal successors, (45), 27 states have internal predecessors, (45), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 53 [2022-02-24 01:52:18,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:52:18,976 INFO L225 Difference]: With dead ends: 81 [2022-02-24 01:52:18,976 INFO L226 Difference]: Without dead ends: 75 [2022-02-24 01:52:18,976 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 585 ImplicationChecksByTransitivity, 31.8s TimeCoverageRelationStatistics Valid=208, Invalid=2234, Unknown=8, NotChecked=0, Total=2450 [2022-02-24 01:52:18,977 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 78 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 915 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 1121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 915 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 171 IncrementalHoareTripleChecker+Unchecked, 5.5s IncrementalHoareTripleChecker+Time [2022-02-24 01:52:18,977 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 118 Invalid, 1121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 915 Invalid, 0 Unknown, 171 Unchecked, 5.5s Time] [2022-02-24 01:52:18,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-02-24 01:52:19,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 68. [2022-02-24 01:52:19,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 56 states have (on average 1.0892857142857142) internal successors, (61), 58 states have internal predecessors, (61), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-02-24 01:52:19,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 73 transitions. [2022-02-24 01:52:19,006 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 73 transitions. Word has length 53 [2022-02-24 01:52:19,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:52:19,006 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 73 transitions. [2022-02-24 01:52:19,006 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 27 states have (on average 1.6666666666666667) internal successors, (45), 27 states have internal predecessors, (45), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:52:19,006 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 73 transitions. [2022-02-24 01:52:19,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-02-24 01:52:19,007 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:52:19,007 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:52:19,007 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2022-02-24 01:52:19,007 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:52:19,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:52:19,007 INFO L85 PathProgramCache]: Analyzing trace with hash -1343425465, now seen corresponding path program 17 times [2022-02-24 01:52:19,007 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:52:19,007 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1242628501] [2022-02-24 01:52:19,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:52:19,008 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:52:19,365 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:52:19,365 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:52:19,592 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:52:19,592 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:52:19,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:52:19,809 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:52:19,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:52:19,813 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:52:19,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:52:20,706 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:52:20,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:52:23,718 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:53:04,727 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:53:04,727 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1242628501] [2022-02-24 01:53:04,727 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1242628501] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:53:04,727 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:53:04,727 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-02-24 01:53:04,727 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149999394] [2022-02-24 01:53:04,727 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:53:04,727 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-02-24 01:53:04,727 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:53:04,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-02-24 01:53:04,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=877, Unknown=16, NotChecked=0, Total=992 [2022-02-24 01:53:04,728 INFO L87 Difference]: Start difference. First operand 68 states and 73 transitions. Second operand has 30 states, 28 states have (on average 1.6071428571428572) internal successors, (45), 28 states have internal predecessors, (45), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:53:18,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:53:18,710 INFO L93 Difference]: Finished difference Result 80 states and 84 transitions. [2022-02-24 01:53:18,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-02-24 01:53:18,710 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 28 states have (on average 1.6071428571428572) internal successors, (45), 28 states have internal predecessors, (45), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 53 [2022-02-24 01:53:18,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:53:18,711 INFO L225 Difference]: With dead ends: 80 [2022-02-24 01:53:18,711 INFO L226 Difference]: Without dead ends: 70 [2022-02-24 01:53:18,712 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 608 ImplicationChecksByTransitivity, 51.8s TimeCoverageRelationStatistics Valid=209, Invalid=2223, Unknown=18, NotChecked=0, Total=2450 [2022-02-24 01:53:18,712 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 67 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 703 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 859 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 703 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 126 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2022-02-24 01:53:18,712 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 103 Invalid, 859 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 703 Invalid, 0 Unknown, 126 Unchecked, 4.3s Time] [2022-02-24 01:53:18,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-02-24 01:53:18,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 68. [2022-02-24 01:53:18,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 56 states have (on average 1.0714285714285714) internal successors, (60), 58 states have internal predecessors, (60), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-02-24 01:53:18,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 72 transitions. [2022-02-24 01:53:18,755 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 72 transitions. Word has length 53 [2022-02-24 01:53:18,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:53:18,755 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 72 transitions. [2022-02-24 01:53:18,755 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 28 states have (on average 1.6071428571428572) internal successors, (45), 28 states have internal predecessors, (45), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:53:18,755 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 72 transitions. [2022-02-24 01:53:18,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-02-24 01:53:18,756 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:53:18,756 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:53:18,756 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2022-02-24 01:53:18,756 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:53:18,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:53:18,756 INFO L85 PathProgramCache]: Analyzing trace with hash 1203265197, now seen corresponding path program 18 times [2022-02-24 01:53:18,756 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:53:18,756 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2110013578] [2022-02-24 01:53:18,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:53:18,756 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:53:18,996 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:53:18,996 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:53:19,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:53:19,220 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:53:19,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:53:19,223 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:53:19,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:53:20,055 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:53:20,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:53:23,776 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:53:46,118 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:53:46,118 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2110013578] [2022-02-24 01:53:46,118 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [2110013578] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:53:46,118 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:53:46,118 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-02-24 01:53:46,118 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483793535] [2022-02-24 01:53:46,118 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:53:46,119 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-02-24 01:53:46,119 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:53:46,119 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-02-24 01:53:46,119 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=890, Unknown=7, NotChecked=0, Total=992 [2022-02-24 01:53:46,119 INFO L87 Difference]: Start difference. First operand 68 states and 72 transitions. Second operand has 30 states, 28 states have (on average 1.6785714285714286) internal successors, (47), 28 states have internal predecessors, (47), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:53:58,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:53:58,925 INFO L93 Difference]: Finished difference Result 83 states and 88 transitions. [2022-02-24 01:53:58,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-02-24 01:53:58,926 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 28 states have (on average 1.6785714285714286) internal successors, (47), 28 states have internal predecessors, (47), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 55 [2022-02-24 01:53:58,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:53:58,927 INFO L225 Difference]: With dead ends: 83 [2022-02-24 01:53:58,927 INFO L226 Difference]: Without dead ends: 77 [2022-02-24 01:53:58,927 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 629 ImplicationChecksByTransitivity, 32.3s TimeCoverageRelationStatistics Valid=217, Invalid=2427, Unknown=8, NotChecked=0, Total=2652 [2022-02-24 01:53:58,928 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 92 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 744 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 910 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 744 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 129 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2022-02-24 01:53:58,928 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 58 Invalid, 910 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 744 Invalid, 0 Unknown, 129 Unchecked, 4.5s Time] [2022-02-24 01:53:58,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-02-24 01:53:58,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 70. [2022-02-24 01:53:58,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 58 states have (on average 1.0862068965517242) internal successors, (63), 60 states have internal predecessors, (63), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-02-24 01:53:58,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 75 transitions. [2022-02-24 01:53:58,960 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 75 transitions. Word has length 55 [2022-02-24 01:53:58,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:53:58,960 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 75 transitions. [2022-02-24 01:53:58,960 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 28 states have (on average 1.6785714285714286) internal successors, (47), 28 states have internal predecessors, (47), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:53:58,960 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 75 transitions. [2022-02-24 01:53:58,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-02-24 01:53:58,965 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:53:58,965 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:53:58,966 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2022-02-24 01:53:58,966 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:53:58,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:53:58,966 INFO L85 PathProgramCache]: Analyzing trace with hash 5056969, now seen corresponding path program 19 times [2022-02-24 01:53:58,967 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:53:58,967 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1092868081] [2022-02-24 01:53:58,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:53:58,967 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:53:59,377 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:53:59,378 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:53:59,647 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:53:59,648 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:53:59,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:53:59,879 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:53:59,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:53:59,883 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:53:59,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:54:00,768 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:54:00,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:54:04,410 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:54:47,493 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:54:47,494 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1092868081] [2022-02-24 01:54:47,494 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1092868081] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:54:47,494 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:54:47,494 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-02-24 01:54:47,494 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462210119] [2022-02-24 01:54:47,494 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:54:47,494 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-02-24 01:54:47,494 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:54:47,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-02-24 01:54:47,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=937, Unknown=17, NotChecked=0, Total=1056 [2022-02-24 01:54:47,495 INFO L87 Difference]: Start difference. First operand 70 states and 75 transitions. Second operand has 31 states, 29 states have (on average 1.6206896551724137) internal successors, (47), 29 states have internal predecessors, (47), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:55:03,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:55:03,619 INFO L93 Difference]: Finished difference Result 82 states and 86 transitions. [2022-02-24 01:55:03,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-02-24 01:55:03,620 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 29 states have (on average 1.6206896551724137) internal successors, (47), 29 states have internal predecessors, (47), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 55 [2022-02-24 01:55:03,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:55:03,620 INFO L225 Difference]: With dead ends: 82 [2022-02-24 01:55:03,620 INFO L226 Difference]: Without dead ends: 72 [2022-02-24 01:55:03,621 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 655 ImplicationChecksByTransitivity, 55.0s TimeCoverageRelationStatistics Valid=218, Invalid=2415, Unknown=19, NotChecked=0, Total=2652 [2022-02-24 01:55:03,621 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 66 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 848 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 1063 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 848 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 183 IncrementalHoareTripleChecker+Unchecked, 5.8s IncrementalHoareTripleChecker+Time [2022-02-24 01:55:03,622 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 106 Invalid, 1063 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 848 Invalid, 0 Unknown, 183 Unchecked, 5.8s Time] [2022-02-24 01:55:03,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-02-24 01:55:03,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 70. [2022-02-24 01:55:03,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 58 states have (on average 1.0689655172413792) internal successors, (62), 60 states have internal predecessors, (62), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-02-24 01:55:03,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 74 transitions. [2022-02-24 01:55:03,695 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 74 transitions. Word has length 55 [2022-02-24 01:55:03,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:55:03,695 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 74 transitions. [2022-02-24 01:55:03,695 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 29 states have (on average 1.6206896551724137) internal successors, (47), 29 states have internal predecessors, (47), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:55:03,695 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 74 transitions. [2022-02-24 01:55:03,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-02-24 01:55:03,696 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:55:03,696 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:55:03,696 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2022-02-24 01:55:03,696 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:55:03,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:55:03,697 INFO L85 PathProgramCache]: Analyzing trace with hash -756575569, now seen corresponding path program 20 times [2022-02-24 01:55:03,697 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:55:03,697 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1609591776] [2022-02-24 01:55:03,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:55:03,697 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:55:03,978 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:55:03,978 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:55:03,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:55:04,243 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:55:04,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:55:04,247 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:55:04,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:55:05,108 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:55:05,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:55:09,448 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:55:31,846 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:55:31,846 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1609591776] [2022-02-24 01:55:31,846 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1609591776] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:55:31,846 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:55:31,846 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-02-24 01:55:31,846 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643564897] [2022-02-24 01:55:31,846 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:55:31,847 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-02-24 01:55:31,847 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:55:31,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-02-24 01:55:31,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=951, Unknown=7, NotChecked=0, Total=1056 [2022-02-24 01:55:31,848 INFO L87 Difference]: Start difference. First operand 70 states and 74 transitions. Second operand has 31 states, 29 states have (on average 1.6896551724137931) internal successors, (49), 29 states have internal predecessors, (49), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:55:46,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:55:46,570 INFO L93 Difference]: Finished difference Result 85 states and 90 transitions. [2022-02-24 01:55:46,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-02-24 01:55:46,570 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 29 states have (on average 1.6896551724137931) internal successors, (49), 29 states have internal predecessors, (49), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 57 [2022-02-24 01:55:46,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:55:46,571 INFO L225 Difference]: With dead ends: 85 [2022-02-24 01:55:46,571 INFO L226 Difference]: Without dead ends: 79 [2022-02-24 01:55:46,572 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 678 ImplicationChecksByTransitivity, 33.6s TimeCoverageRelationStatistics Valid=223, Invalid=2631, Unknown=8, NotChecked=0, Total=2862 [2022-02-24 01:55:46,573 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 80 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 896 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 1004 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 896 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 69 IncrementalHoareTripleChecker+Unchecked, 5.8s IncrementalHoareTripleChecker+Time [2022-02-24 01:55:46,573 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 78 Invalid, 1004 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 896 Invalid, 0 Unknown, 69 Unchecked, 5.8s Time] [2022-02-24 01:55:46,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-02-24 01:55:46,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 72. [2022-02-24 01:55:46,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 60 states have (on average 1.0833333333333333) internal successors, (65), 62 states have internal predecessors, (65), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-02-24 01:55:46,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 77 transitions. [2022-02-24 01:55:46,624 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 77 transitions. Word has length 57 [2022-02-24 01:55:46,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:55:46,628 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 77 transitions. [2022-02-24 01:55:46,628 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 29 states have (on average 1.6896551724137931) internal successors, (49), 29 states have internal predecessors, (49), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:55:46,643 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 77 transitions. [2022-02-24 01:55:46,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-02-24 01:55:46,644 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:55:46,644 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:55:46,644 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2022-02-24 01:55:46,644 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:55:46,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:55:46,644 INFO L85 PathProgramCache]: Analyzing trace with hash -1183447349, now seen corresponding path program 21 times [2022-02-24 01:55:46,644 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:55:46,644 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [251780525] [2022-02-24 01:55:46,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:55:46,645 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:55:46,927 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:55:46,927 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:55:47,310 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:55:47,310 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:55:47,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:55:47,593 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:55:47,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:55:47,595 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:55:47,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:55:48,468 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:55:48,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:55:52,441 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:56:35,913 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:56:35,913 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [251780525] [2022-02-24 01:56:35,913 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [251780525] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:56:35,913 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:56:35,913 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-02-24 01:56:35,913 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161876694] [2022-02-24 01:56:35,913 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:56:35,913 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-02-24 01:56:35,914 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:56:35,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-02-24 01:56:35,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1000, Unknown=16, NotChecked=0, Total=1122 [2022-02-24 01:56:35,914 INFO L87 Difference]: Start difference. First operand 72 states and 77 transitions. Second operand has 32 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 30 states have internal predecessors, (49), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:56:58,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:56:58,505 INFO L93 Difference]: Finished difference Result 84 states and 88 transitions. [2022-02-24 01:56:58,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-02-24 01:56:58,506 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 30 states have internal predecessors, (49), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 57 [2022-02-24 01:56:58,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:56:58,507 INFO L225 Difference]: With dead ends: 84 [2022-02-24 01:56:58,507 INFO L226 Difference]: Without dead ends: 74 [2022-02-24 01:56:58,508 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 730 ImplicationChecksByTransitivity, 62.1s TimeCoverageRelationStatistics Valid=225, Invalid=2619, Unknown=18, NotChecked=0, Total=2862 [2022-02-24 01:56:58,508 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 66 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 908 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 1070 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 908 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 128 IncrementalHoareTripleChecker+Unchecked, 5.9s IncrementalHoareTripleChecker+Time [2022-02-24 01:56:58,509 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 126 Invalid, 1070 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 908 Invalid, 0 Unknown, 128 Unchecked, 5.9s Time] [2022-02-24 01:56:58,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-02-24 01:56:58,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 72. [2022-02-24 01:56:58,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 60 states have (on average 1.0666666666666667) internal successors, (64), 62 states have internal predecessors, (64), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-02-24 01:56:58,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 76 transitions. [2022-02-24 01:56:58,546 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 76 transitions. Word has length 57 [2022-02-24 01:56:58,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:56:58,546 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 76 transitions. [2022-02-24 01:56:58,546 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 30 states have internal predecessors, (49), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:56:58,546 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 76 transitions. [2022-02-24 01:56:58,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-02-24 01:56:58,546 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:56:58,547 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:56:58,547 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2022-02-24 01:56:58,547 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:56:58,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:56:58,547 INFO L85 PathProgramCache]: Analyzing trace with hash 1327091249, now seen corresponding path program 22 times [2022-02-24 01:56:58,547 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:56:58,547 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [479509633] [2022-02-24 01:56:58,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:56:58,548 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:56:58,947 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:56:58,948 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:56:58,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:56:59,176 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:56:59,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:56:59,179 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:56:59,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:57:00,084 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:57:00,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:57:04,691 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 01:57:27,097 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 01:57:27,098 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [479509633] [2022-02-24 01:57:27,098 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [479509633] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 01:57:27,098 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 01:57:27,098 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-02-24 01:57:27,098 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694857139] [2022-02-24 01:57:27,098 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 01:57:27,099 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-02-24 01:57:27,099 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 01:57:27,099 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-02-24 01:57:27,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1014, Unknown=7, NotChecked=0, Total=1122 [2022-02-24 01:57:27,099 INFO L87 Difference]: Start difference. First operand 72 states and 76 transitions. Second operand has 32 states, 30 states have (on average 1.7) internal successors, (51), 30 states have internal predecessors, (51), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:57:43,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 01:57:43,457 INFO L93 Difference]: Finished difference Result 87 states and 92 transitions. [2022-02-24 01:57:43,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-02-24 01:57:43,458 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 30 states have (on average 1.7) internal successors, (51), 30 states have internal predecessors, (51), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 59 [2022-02-24 01:57:43,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 01:57:43,458 INFO L225 Difference]: With dead ends: 87 [2022-02-24 01:57:43,459 INFO L226 Difference]: Without dead ends: 81 [2022-02-24 01:57:43,459 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 720 ImplicationChecksByTransitivity, 34.3s TimeCoverageRelationStatistics Valid=235, Invalid=2837, Unknown=8, NotChecked=0, Total=3080 [2022-02-24 01:57:43,459 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 92 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 1088 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 1264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 1088 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 135 IncrementalHoareTripleChecker+Unchecked, 7.0s IncrementalHoareTripleChecker+Time [2022-02-24 01:57:43,460 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 98 Invalid, 1264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 1088 Invalid, 0 Unknown, 135 Unchecked, 7.0s Time] [2022-02-24 01:57:43,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-02-24 01:57:43,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 74. [2022-02-24 01:57:43,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 62 states have (on average 1.0806451612903225) internal successors, (67), 64 states have internal predecessors, (67), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-02-24 01:57:43,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 79 transitions. [2022-02-24 01:57:43,497 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 79 transitions. Word has length 59 [2022-02-24 01:57:43,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 01:57:43,498 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 79 transitions. [2022-02-24 01:57:43,498 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 30 states have (on average 1.7) internal successors, (51), 30 states have internal predecessors, (51), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-02-24 01:57:43,498 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 79 transitions. [2022-02-24 01:57:43,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-02-24 01:57:43,499 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 01:57:43,499 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 01:57:43,500 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2022-02-24 01:57:43,500 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 01:57:43,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 01:57:43,500 INFO L85 PathProgramCache]: Analyzing trace with hash -874796211, now seen corresponding path program 23 times [2022-02-24 01:57:43,500 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 01:57:43,500 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [195242817] [2022-02-24 01:57:43,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 01:57:43,501 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 01:57:43,866 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:57:43,866 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:57:44,251 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-24 01:57:44,251 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 01:57:44,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:57:44,472 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 01:57:44,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:57:44,474 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-02-24 01:57:44,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:57:45,329 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-24 01:57:45,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 01:57:49,647 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.