/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/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/loop-acceleration/diamond_2-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 18:00:54,890 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 18:00:54,891 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 18:00:54,908 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 18:00:54,936 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 18:00:54,936 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 18:00:54,942 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 18:00:54,943 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-20 18:00:54,951 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 18:00:54,952 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 18:00:54,952 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 18:00:54,953 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 18:00:54,953 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 18:00:54,953 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 18:00:54,953 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 18:00:54,953 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 18:00:54,953 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 18:00:54,953 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 18:00:54,953 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 18:00:54,953 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 18:00:54,953 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 18:00:54,954 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 18:00:54,954 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 18:00:54,954 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 18:00:54,954 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 18:00:54,954 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 18:00:54,954 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 18:00:54,954 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 18:00:54,954 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 18:00:54,954 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-20 18:00:54,954 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 18:00:55,130 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 18:00:55,147 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 18:00:55,149 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 18:00:55,150 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 18:00:55,151 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 18:00:55,152 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/diamond_2-2.c [2022-03-20 18:00:55,204 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bdcb11ea9/cdb209a7d096495a99fca4beb02400dc/FLAG6872a6868 [2022-03-20 18:00:55,549 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 18:00:55,549 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/diamond_2-2.c [2022-03-20 18:00:55,553 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bdcb11ea9/cdb209a7d096495a99fca4beb02400dc/FLAG6872a6868 [2022-03-20 18:00:56,005 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bdcb11ea9/cdb209a7d096495a99fca4beb02400dc [2022-03-20 18:00:56,007 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 18:00:56,008 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 18:00:56,023 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 18:00:56,023 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 18:00:56,026 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 18:00:56,026 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 06:00:56" (1/1) ... [2022-03-20 18:00:56,027 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@78a0016f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:00:56, skipping insertion in model container [2022-03-20 18:00:56,027 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 06:00:56" (1/1) ... [2022-03-20 18:00:56,031 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 18:00:56,039 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 18:00:56,158 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/diamond_2-2.c[373,386] [2022-03-20 18:00:56,170 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 18:00:56,175 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 18:00:56,184 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/diamond_2-2.c[373,386] [2022-03-20 18:00:56,203 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 18:00:56,212 INFO L208 MainTranslator]: Completed translation [2022-03-20 18:00:56,213 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:00:56 WrapperNode [2022-03-20 18:00:56,213 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 18:00:56,215 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 18:00:56,215 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 18:00:56,215 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 18:00:56,222 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:00:56" (1/1) ... [2022-03-20 18:00:56,222 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:00:56" (1/1) ... [2022-03-20 18:00:56,234 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:00:56" (1/1) ... [2022-03-20 18:00:56,235 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:00:56" (1/1) ... [2022-03-20 18:00:56,244 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:00:56" (1/1) ... [2022-03-20 18:00:56,247 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:00:56" (1/1) ... [2022-03-20 18:00:56,248 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:00:56" (1/1) ... [2022-03-20 18:00:56,249 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 18:00:56,250 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 18:00:56,250 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 18:00:56,250 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 18:00:56,255 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:00:56" (1/1) ... [2022-03-20 18:00:56,261 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 18:00:56,273 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:00:56,283 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-20 18:00:56,299 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-20 18:00:56,316 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 18:00:56,316 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 18:00:56,316 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 18:00:56,316 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 18:00:56,317 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 18:00:56,317 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 18:00:56,317 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 18:00:56,317 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 18:00:56,317 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 18:00:56,317 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-03-20 18:00:56,317 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 18:00:56,317 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 18:00:56,317 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 18:00:56,317 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 18:00:56,317 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 18:00:56,318 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 18:00:56,318 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 18:00:56,318 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 18:00:56,372 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 18:00:56,373 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 18:00:56,537 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 18:00:56,541 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 18:00:56,541 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-20 18:00:56,542 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 06:00:56 BoogieIcfgContainer [2022-03-20 18:00:56,542 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 18:00:56,543 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 18:00:56,543 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 18:00:56,561 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 18:00:56,561 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 06:00:56" (1/3) ... [2022-03-20 18:00:56,562 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b07b3e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 06:00:56, skipping insertion in model container [2022-03-20 18:00:56,562 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:00:56" (2/3) ... [2022-03-20 18:00:56,562 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b07b3e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 06:00:56, skipping insertion in model container [2022-03-20 18:00:56,562 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 06:00:56" (3/3) ... [2022-03-20 18:00:56,563 INFO L111 eAbstractionObserver]: Analyzing ICFG diamond_2-2.c [2022-03-20 18:00:56,566 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 18:00:56,567 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 18:00:56,636 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 18:00:56,645 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, 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 [2022-03-20 18:00:56,646 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 18:00:56,656 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 20 states have (on average 1.7) internal successors, (34), 21 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-20 18:00:56,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-03-20 18:00:56,661 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:00:56,662 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:00:56,662 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:00:56,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:00:56,666 INFO L85 PathProgramCache]: Analyzing trace with hash -154663714, now seen corresponding path program 1 times [2022-03-20 18:00:56,672 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:00:56,672 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1925681047] [2022-03-20 18:00:56,680 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:00:56,680 INFO L85 PathProgramCache]: Analyzing trace with hash -154663714, now seen corresponding path program 2 times [2022-03-20 18:00:56,682 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:00:56,682 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [258319167] [2022-03-20 18:00:56,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:00:56,683 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:00:56,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:00:56,781 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:00:56,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:00:56,791 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:00:56,792 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:00:56,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [258319167] [2022-03-20 18:00:56,793 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [258319167] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:00:56,793 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:00:56,793 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 18:00:56,795 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:00:56,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1925681047] [2022-03-20 18:00:56,795 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1925681047] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:00:56,796 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:00:56,796 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 18:00:56,796 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585875383] [2022-03-20 18:00:56,796 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:00:56,800 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-20 18:00:56,800 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:00:56,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-20 18:00:56,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 18:00:56,820 INFO L87 Difference]: Start difference. First operand has 28 states, 20 states have (on average 1.7) internal successors, (34), 21 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:00:56,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:00:56,880 INFO L93 Difference]: Finished difference Result 39 states and 52 transitions. [2022-03-20 18:00:56,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-20 18:00:56,887 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-03-20 18:00:56,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:00:56,891 INFO L225 Difference]: With dead ends: 39 [2022-03-20 18:00:56,892 INFO L226 Difference]: Without dead ends: 22 [2022-03-20 18:00:56,894 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 18:00:56,901 INFO L913 BasicCegarLoop]: 37 mSDtfsCounter, 29 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:00:56,903 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 40 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:00:56,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-03-20 18:00:56,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-03-20 18:00:56,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 17 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:00:56,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 32 transitions. [2022-03-20 18:00:56,936 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 32 transitions. Word has length 11 [2022-03-20 18:00:56,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:00:56,936 INFO L478 AbstractCegarLoop]: Abstraction has 22 states and 32 transitions. [2022-03-20 18:00:56,937 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:00:56,937 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 32 transitions. [2022-03-20 18:00:56,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-03-20 18:00:56,938 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:00:56,938 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:00:56,938 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 18:00:56,938 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:00:56,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:00:56,940 INFO L85 PathProgramCache]: Analyzing trace with hash -213769058, now seen corresponding path program 1 times [2022-03-20 18:00:56,940 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:00:56,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [739543030] [2022-03-20 18:00:56,943 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:00:56,943 INFO L85 PathProgramCache]: Analyzing trace with hash -213769058, now seen corresponding path program 2 times [2022-03-20 18:00:56,943 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:00:56,944 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [782618503] [2022-03-20 18:00:56,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:00:56,944 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:00:56,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:00:57,081 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:00:57,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:00:57,088 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:00:57,089 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:00:57,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [782618503] [2022-03-20 18:00:57,089 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [782618503] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:00:57,089 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:00:57,089 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 18:00:57,089 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:00:57,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [739543030] [2022-03-20 18:00:57,090 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [739543030] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:00:57,090 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:00:57,090 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 18:00:57,090 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041344488] [2022-03-20 18:00:57,090 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:00:57,091 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-20 18:00:57,091 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:00:57,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-20 18:00:57,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-20 18:00:57,092 INFO L87 Difference]: Start difference. First operand 22 states and 32 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:00:57,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:00:57,161 INFO L93 Difference]: Finished difference Result 29 states and 40 transitions. [2022-03-20 18:00:57,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-20 18:00:57,163 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-03-20 18:00:57,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:00:57,164 INFO L225 Difference]: With dead ends: 29 [2022-03-20 18:00:57,164 INFO L226 Difference]: Without dead ends: 24 [2022-03-20 18:00:57,165 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-03-20 18:00:57,166 INFO L913 BasicCegarLoop]: 29 mSDtfsCounter, 28 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:00:57,167 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 36 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:00:57,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-03-20 18:00:57,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2022-03-20 18:00:57,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:00:57,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 33 transitions. [2022-03-20 18:00:57,174 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 33 transitions. Word has length 11 [2022-03-20 18:00:57,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:00:57,174 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 33 transitions. [2022-03-20 18:00:57,174 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:00:57,174 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 33 transitions. [2022-03-20 18:00:57,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-20 18:00:57,174 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:00:57,174 INFO L499 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] [2022-03-20 18:00:57,175 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-20 18:00:57,175 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:00:57,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:00:57,175 INFO L85 PathProgramCache]: Analyzing trace with hash 1726513949, now seen corresponding path program 1 times [2022-03-20 18:00:57,175 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:00:57,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [591811594] [2022-03-20 18:00:57,206 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:00:57,206 INFO L85 PathProgramCache]: Analyzing trace with hash 279245208, now seen corresponding path program 1 times [2022-03-20 18:00:57,207 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:00:57,207 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [327146775] [2022-03-20 18:00:57,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:00:57,207 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:00:57,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:00:57,248 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:00:57,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:00:57,253 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:00:57,254 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:00:57,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [327146775] [2022-03-20 18:00:57,254 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [327146775] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:00:57,254 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:00:57,254 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 18:00:57,276 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:00:57,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [591811594] [2022-03-20 18:00:57,277 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [591811594] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:00:57,277 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:00:57,277 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 18:00:57,277 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2134654746] [2022-03-20 18:00:57,277 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:00:57,277 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 18:00:57,277 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:00:57,278 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 18:00:57,278 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-20 18:00:57,278 INFO L87 Difference]: Start difference. First operand 23 states and 33 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:00:57,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:00:57,352 INFO L93 Difference]: Finished difference Result 41 states and 63 transitions. [2022-03-20 18:00:57,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 18:00:57,353 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2022-03-20 18:00:57,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:00:57,353 INFO L225 Difference]: With dead ends: 41 [2022-03-20 18:00:57,353 INFO L226 Difference]: Without dead ends: 25 [2022-03-20 18:00:57,354 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-03-20 18:00:57,355 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 27 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:00:57,355 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 40 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:00:57,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-03-20 18:00:57,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-03-20 18:00:57,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.6) internal successors, (32), 20 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:00:57,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 36 transitions. [2022-03-20 18:00:57,359 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 36 transitions. Word has length 22 [2022-03-20 18:00:57,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:00:57,360 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 36 transitions. [2022-03-20 18:00:57,360 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:00:57,360 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 36 transitions. [2022-03-20 18:00:57,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-20 18:00:57,360 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:00:57,361 INFO L499 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] [2022-03-20 18:00:57,361 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-20 18:00:57,361 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:00:57,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:00:57,361 INFO L85 PathProgramCache]: Analyzing trace with hash 715396699, now seen corresponding path program 1 times [2022-03-20 18:00:57,361 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:00:57,362 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1534252357] [2022-03-20 18:00:57,370 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:00:57,370 INFO L85 PathProgramCache]: Analyzing trace with hash 338350552, now seen corresponding path program 1 times [2022-03-20 18:00:57,370 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:00:57,371 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [119650623] [2022-03-20 18:00:57,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:00:57,371 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:00:57,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:00:57,404 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:00:57,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:00:57,409 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:00:57,410 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:00:57,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [119650623] [2022-03-20 18:00:57,410 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [119650623] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:00:57,410 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:00:57,410 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 18:00:57,436 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:00:57,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1534252357] [2022-03-20 18:00:57,436 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1534252357] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:00:57,436 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:00:57,437 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:00:57,437 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407820896] [2022-03-20 18:00:57,437 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:00:57,437 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 18:00:57,437 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:00:57,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 18:00:57,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-20 18:00:57,438 INFO L87 Difference]: Start difference. First operand 25 states and 36 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:00:57,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:00:57,538 INFO L93 Difference]: Finished difference Result 45 states and 70 transitions. [2022-03-20 18:00:57,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 18:00:57,538 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2022-03-20 18:00:57,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:00:57,540 INFO L225 Difference]: With dead ends: 45 [2022-03-20 18:00:57,540 INFO L226 Difference]: Without dead ends: 29 [2022-03-20 18:00:57,542 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2022-03-20 18:00:57,547 INFO L913 BasicCegarLoop]: 24 mSDtfsCounter, 27 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:00:57,548 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 41 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:00:57,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-20 18:00:57,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-03-20 18:00:57,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.5) internal successors, (36), 24 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:00:57,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 40 transitions. [2022-03-20 18:00:57,554 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 40 transitions. Word has length 22 [2022-03-20 18:00:57,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:00:57,555 INFO L478 AbstractCegarLoop]: Abstraction has 29 states and 40 transitions. [2022-03-20 18:00:57,555 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:00:57,555 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 40 transitions. [2022-03-20 18:00:57,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-20 18:00:57,555 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:00:57,555 INFO L499 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] [2022-03-20 18:00:57,555 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-03-20 18:00:57,556 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:00:57,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:00:57,556 INFO L85 PathProgramCache]: Analyzing trace with hash 694793691, now seen corresponding path program 1 times [2022-03-20 18:00:57,556 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:00:57,556 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1619190564] [2022-03-20 18:00:57,564 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:00:57,565 INFO L85 PathProgramCache]: Analyzing trace with hash 397455896, now seen corresponding path program 1 times [2022-03-20 18:00:57,565 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:00:57,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928829965] [2022-03-20 18:00:57,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:00:57,566 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:00:57,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:00:57,616 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:00:57,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:00:57,628 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:00:57,628 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:00:57,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928829965] [2022-03-20 18:00:57,628 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [928829965] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:00:57,629 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:00:57,629 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 18:00:57,675 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:00:57,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1619190564] [2022-03-20 18:00:57,675 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1619190564] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:00:57,675 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:00:57,675 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:00:57,675 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739437592] [2022-03-20 18:00:57,675 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:00:57,676 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 18:00:57,676 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:00:57,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 18:00:57,676 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-03-20 18:00:57,676 INFO L87 Difference]: Start difference. First operand 29 states and 40 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:00:57,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:00:57,780 INFO L93 Difference]: Finished difference Result 47 states and 70 transitions. [2022-03-20 18:00:57,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 18:00:57,781 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2022-03-20 18:00:57,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:00:57,781 INFO L225 Difference]: With dead ends: 47 [2022-03-20 18:00:57,781 INFO L226 Difference]: Without dead ends: 31 [2022-03-20 18:00:57,782 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2022-03-20 18:00:57,783 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 27 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:00:57,783 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 44 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:00:57,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-03-20 18:00:57,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-03-20 18:00:57,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.4615384615384615) internal successors, (38), 26 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:00:57,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 42 transitions. [2022-03-20 18:00:57,787 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 42 transitions. Word has length 22 [2022-03-20 18:00:57,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:00:57,788 INFO L478 AbstractCegarLoop]: Abstraction has 31 states and 42 transitions. [2022-03-20 18:00:57,788 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:00:57,788 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 42 transitions. [2022-03-20 18:00:57,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-20 18:00:57,789 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:00:57,789 INFO L499 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] [2022-03-20 18:00:57,789 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-03-20 18:00:57,789 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:00:57,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:00:57,789 INFO L85 PathProgramCache]: Analyzing trace with hash 565505435, now seen corresponding path program 1 times [2022-03-20 18:00:57,789 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:00:57,790 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [499695250] [2022-03-20 18:00:57,797 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:00:57,798 INFO L85 PathProgramCache]: Analyzing trace with hash 456561240, now seen corresponding path program 1 times [2022-03-20 18:00:57,798 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:00:57,798 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [78395223] [2022-03-20 18:00:57,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:00:57,798 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:00:57,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:00:57,828 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:00:57,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:00:57,832 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:00:57,832 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:00:57,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [78395223] [2022-03-20 18:00:57,832 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [78395223] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:00:57,833 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:00:57,833 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 18:00:57,894 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:00:57,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [499695250] [2022-03-20 18:00:57,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [499695250] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:00:57,895 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:00:57,895 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:00:57,895 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184101763] [2022-03-20 18:00:57,895 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:00:57,895 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:00:57,895 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:00:57,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:00:57,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-03-20 18:00:57,896 INFO L87 Difference]: Start difference. First operand 31 states and 42 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:00:58,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:00:58,017 INFO L93 Difference]: Finished difference Result 49 states and 72 transitions. [2022-03-20 18:00:58,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 18:00:58,018 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2022-03-20 18:00:58,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:00:58,018 INFO L225 Difference]: With dead ends: 49 [2022-03-20 18:00:58,018 INFO L226 Difference]: Without dead ends: 33 [2022-03-20 18:00:58,018 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 13 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2022-03-20 18:00:58,019 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 27 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:00:58,019 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 47 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:00:58,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-03-20 18:00:58,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-03-20 18:00:58,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:00:58,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 44 transitions. [2022-03-20 18:00:58,023 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 44 transitions. Word has length 22 [2022-03-20 18:00:58,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:00:58,023 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 44 transitions. [2022-03-20 18:00:58,023 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:00:58,023 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 44 transitions. [2022-03-20 18:00:58,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-20 18:00:58,024 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:00:58,024 INFO L499 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] [2022-03-20 18:00:58,024 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-03-20 18:00:58,024 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:00:58,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:00:58,025 INFO L85 PathProgramCache]: Analyzing trace with hash 622763737, now seen corresponding path program 1 times [2022-03-20 18:00:58,025 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:00:58,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [448339673] [2022-03-20 18:00:58,068 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:00:58,068 INFO L85 PathProgramCache]: Analyzing trace with hash 515666584, now seen corresponding path program 1 times [2022-03-20 18:00:58,068 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:00:58,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1160540653] [2022-03-20 18:00:58,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:00:58,069 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:00:58,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:00:58,113 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:00:58,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:00:58,116 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:00:58,117 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:00:58,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1160540653] [2022-03-20 18:00:58,117 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1160540653] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:00:58,117 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:00:58,117 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 18:00:58,225 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:00:58,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [448339673] [2022-03-20 18:00:58,225 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [448339673] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:00:58,225 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:00:58,225 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 18:00:58,225 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589076329] [2022-03-20 18:00:58,226 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:00:58,226 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 18:00:58,226 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:00:58,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 18:00:58,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2022-03-20 18:00:58,226 INFO L87 Difference]: Start difference. First operand 33 states and 44 transitions. Second operand has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 9 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:00:58,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:00:58,380 INFO L93 Difference]: Finished difference Result 53 states and 75 transitions. [2022-03-20 18:00:58,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 18:00:58,381 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 9 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2022-03-20 18:00:58,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:00:58,381 INFO L225 Difference]: With dead ends: 53 [2022-03-20 18:00:58,381 INFO L226 Difference]: Without dead ends: 24 [2022-03-20 18:00:58,382 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 10 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2022-03-20 18:00:58,382 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 26 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 73 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:00:58,382 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 67 Invalid, 252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 163 Invalid, 0 Unknown, 73 Unchecked, 0.1s Time] [2022-03-20 18:00:58,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-03-20 18:00:58,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-03-20 18:00:58,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 19 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:00:58,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 34 transitions. [2022-03-20 18:00:58,385 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 34 transitions. Word has length 22 [2022-03-20 18:00:58,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:00:58,385 INFO L478 AbstractCegarLoop]: Abstraction has 24 states and 34 transitions. [2022-03-20 18:00:58,385 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 9 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:00:58,386 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 34 transitions. [2022-03-20 18:00:58,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-20 18:00:58,386 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:00:58,386 INFO L499 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] [2022-03-20 18:00:58,386 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-03-20 18:00:58,386 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:00:58,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:00:58,387 INFO L85 PathProgramCache]: Analyzing trace with hash -1288589669, now seen corresponding path program 1 times [2022-03-20 18:00:58,387 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:00:58,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [988206426] [2022-03-20 18:00:58,394 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:00:58,394 INFO L85 PathProgramCache]: Analyzing trace with hash 574771928, now seen corresponding path program 1 times [2022-03-20 18:00:58,394 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:00:58,394 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1916284310] [2022-03-20 18:00:58,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:00:58,394 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:00:58,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:00:58,424 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:00:58,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:00:58,428 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:00:58,429 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:00:58,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1916284310] [2022-03-20 18:00:58,429 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1916284310] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:00:58,429 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:00:58,429 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 18:00:58,510 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:00:58,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [988206426] [2022-03-20 18:00:58,511 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [988206426] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:00:58,511 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:00:58,511 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 18:00:58,511 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1649616115] [2022-03-20 18:00:58,511 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:00:58,511 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 18:00:58,511 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:00:58,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 18:00:58,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2022-03-20 18:00:58,512 INFO L87 Difference]: Start difference. First operand 24 states and 34 transitions. Second operand has 12 states, 12 states have (on average 1.5) internal successors, (18), 11 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:00:58,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:00:58,711 INFO L93 Difference]: Finished difference Result 48 states and 76 transitions. [2022-03-20 18:00:58,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 18:00:58,711 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.5) internal successors, (18), 11 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2022-03-20 18:00:58,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:00:58,712 INFO L225 Difference]: With dead ends: 48 [2022-03-20 18:00:58,712 INFO L226 Difference]: Without dead ends: 32 [2022-03-20 18:00:58,712 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2022-03-20 18:00:58,713 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 27 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:00:58,713 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 69 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:00:58,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-03-20 18:00:58,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-03-20 18:00:58,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 27 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:00:58,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2022-03-20 18:00:58,717 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 22 [2022-03-20 18:00:58,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:00:58,717 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2022-03-20 18:00:58,717 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.5) internal successors, (18), 11 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:00:58,717 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2022-03-20 18:00:58,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-20 18:00:58,717 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:00:58,717 INFO L499 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] [2022-03-20 18:00:58,717 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-03-20 18:00:58,718 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:00:58,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:00:58,718 INFO L85 PathProgramCache]: Analyzing trace with hash 1231370265, now seen corresponding path program 1 times [2022-03-20 18:00:58,718 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:00:58,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [595515881] [2022-03-20 18:00:58,750 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:00:58,751 INFO L85 PathProgramCache]: Analyzing trace with hash 633877272, now seen corresponding path program 1 times [2022-03-20 18:00:58,751 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:00:58,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2034615459] [2022-03-20 18:00:58,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:00:58,751 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:00:58,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:00:58,833 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:00:58,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:00:58,836 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:00:58,837 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:00:58,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2034615459] [2022-03-20 18:00:58,837 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2034615459] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:00:58,837 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:00:58,837 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:01:03,705 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:01:03,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [595515881] [2022-03-20 18:01:03,705 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [595515881] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:01:03,705 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:01:03,706 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-20 18:01:03,706 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099808268] [2022-03-20 18:01:03,706 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:01:03,706 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-20 18:01:03,706 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:01:03,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-20 18:01:03,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2022-03-20 18:01:03,707 INFO L87 Difference]: Start difference. First operand 32 states and 42 transitions. Second operand has 18 states, 17 states have (on average 1.0588235294117647) internal successors, (18), 16 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:01:07,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:01:07,678 INFO L93 Difference]: Finished difference Result 66 states and 100 transitions. [2022-03-20 18:01:07,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 18:01:07,679 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.0588235294117647) internal successors, (18), 16 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2022-03-20 18:01:07,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:01:07,679 INFO L225 Difference]: With dead ends: 66 [2022-03-20 18:01:07,679 INFO L226 Difference]: Without dead ends: 46 [2022-03-20 18:01:07,680 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 198 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=164, Invalid=1026, Unknown=0, NotChecked=0, Total=1190 [2022-03-20 18:01:07,680 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 39 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 414 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 483 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:01:07,681 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 71 Invalid, 483 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 414 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-03-20 18:01:07,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-03-20 18:01:07,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2022-03-20 18:01:07,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.5121951219512195) internal successors, (62), 41 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:01:07,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 66 transitions. [2022-03-20 18:01:07,694 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 66 transitions. Word has length 22 [2022-03-20 18:01:07,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:01:07,694 INFO L478 AbstractCegarLoop]: Abstraction has 46 states and 66 transitions. [2022-03-20 18:01:07,694 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 1.0588235294117647) internal successors, (18), 16 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:01:07,694 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 66 transitions. [2022-03-20 18:01:07,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-20 18:01:07,695 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:01:07,695 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:01:07,695 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-03-20 18:01:07,695 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:01:07,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:01:07,695 INFO L85 PathProgramCache]: Analyzing trace with hash 1975598651, now seen corresponding path program 1 times [2022-03-20 18:01:07,696 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:01:07,696 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [931562445] [2022-03-20 18:01:07,830 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:01:07,831 INFO L85 PathProgramCache]: Analyzing trace with hash 692982616, now seen corresponding path program 1 times [2022-03-20 18:01:07,831 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:01:07,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1852616582] [2022-03-20 18:01:07,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:01:07,831 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:01:07,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:01:07,927 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:01:07,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:01:07,933 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:01:07,933 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:01:07,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1852616582] [2022-03-20 18:01:07,934 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1852616582] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:01:07,934 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:01:07,934 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:01:17,967 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:01:17,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [931562445] [2022-03-20 18:01:17,967 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [931562445] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:01:17,967 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:01:17,967 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-03-20 18:01:17,967 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625372200] [2022-03-20 18:01:17,967 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:01:17,968 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-03-20 18:01:17,968 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:01:17,968 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-03-20 18:01:17,968 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=711, Unknown=0, NotChecked=0, Total=812 [2022-03-20 18:01:17,969 INFO L87 Difference]: Start difference. First operand 46 states and 66 transitions. Second operand has 27 states, 26 states have (on average 1.5) internal successors, (39), 25 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:01:35,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:01:35,997 INFO L93 Difference]: Finished difference Result 81 states and 129 transitions. [2022-03-20 18:01:35,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-03-20 18:01:35,998 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 1.5) internal successors, (39), 25 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2022-03-20 18:01:35,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:01:35,998 INFO L225 Difference]: With dead ends: 81 [2022-03-20 18:01:35,998 INFO L226 Difference]: Without dead ends: 54 [2022-03-20 18:01:35,999 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 357 ImplicationChecksByTransitivity, 23.9s TimeCoverageRelationStatistics Valid=247, Invalid=2202, Unknown=1, NotChecked=0, Total=2450 [2022-03-20 18:01:36,000 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 33 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 838 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 909 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 838 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:01:36,000 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 76 Invalid, 909 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 838 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2022-03-20 18:01:36,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-03-20 18:01:36,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2022-03-20 18:01:36,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 49 states have (on average 1.4285714285714286) internal successors, (70), 49 states have internal predecessors, (70), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:01:36,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 74 transitions. [2022-03-20 18:01:36,018 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 74 transitions. Word has length 44 [2022-03-20 18:01:36,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:01:36,019 INFO L478 AbstractCegarLoop]: Abstraction has 54 states and 74 transitions. [2022-03-20 18:01:36,019 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 1.5) internal successors, (39), 25 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:01:36,019 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 74 transitions. [2022-03-20 18:01:36,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-20 18:01:36,021 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:01:36,021 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:01:36,022 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-03-20 18:01:36,022 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:01:36,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:01:36,022 INFO L85 PathProgramCache]: Analyzing trace with hash -325223939, now seen corresponding path program 2 times [2022-03-20 18:01:36,022 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:01:36,022 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1013867265] [2022-03-20 18:01:36,148 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:01:36,149 INFO L85 PathProgramCache]: Analyzing trace with hash 752087960, now seen corresponding path program 1 times [2022-03-20 18:01:36,149 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:01:36,149 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2026497600] [2022-03-20 18:01:36,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:01:36,149 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:01:36,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:01:36,303 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:01:36,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:01:36,307 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:01:36,308 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:01:36,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2026497600] [2022-03-20 18:01:36,308 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2026497600] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:01:36,308 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:01:36,308 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:01:52,505 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:01:52,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1013867265] [2022-03-20 18:01:52,505 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1013867265] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:01:52,505 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:01:52,505 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-03-20 18:01:52,505 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390054834] [2022-03-20 18:01:52,505 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:01:52,506 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-03-20 18:01:52,506 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:01:52,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-03-20 18:01:52,507 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=878, Unknown=0, NotChecked=0, Total=992 [2022-03-20 18:01:52,507 INFO L87 Difference]: Start difference. First operand 54 states and 74 transitions. Second operand has 30 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 28 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:02:08,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:02:08,577 INFO L93 Difference]: Finished difference Result 84 states and 126 transitions. [2022-03-20 18:02:08,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-03-20 18:02:08,577 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 28 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2022-03-20 18:02:08,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:02:08,578 INFO L225 Difference]: With dead ends: 84 [2022-03-20 18:02:08,578 INFO L226 Difference]: Without dead ends: 57 [2022-03-20 18:02:08,579 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 469 ImplicationChecksByTransitivity, 27.0s TimeCoverageRelationStatistics Valid=283, Invalid=2797, Unknown=0, NotChecked=0, Total=3080 [2022-03-20 18:02:08,580 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 35 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 978 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 1063 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 978 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:02:08,580 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 88 Invalid, 1063 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 978 Invalid, 0 Unknown, 0 Unchecked, 5.0s Time] [2022-03-20 18:02:08,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-03-20 18:02:08,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-03-20 18:02:08,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.4038461538461537) internal successors, (73), 52 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:02:08,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 77 transitions. [2022-03-20 18:02:08,596 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 77 transitions. Word has length 44 [2022-03-20 18:02:08,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:02:08,596 INFO L478 AbstractCegarLoop]: Abstraction has 57 states and 77 transitions. [2022-03-20 18:02:08,596 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 28 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:02:08,596 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 77 transitions. [2022-03-20 18:02:08,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-03-20 18:02:08,597 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:02:08,597 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:02:08,615 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-03-20 18:02:08,616 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:02:08,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:02:08,616 INFO L85 PathProgramCache]: Analyzing trace with hash 1775224352, now seen corresponding path program 3 times [2022-03-20 18:02:08,616 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:02:08,616 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [659531900] [2022-03-20 18:02:08,763 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:02:08,763 INFO L85 PathProgramCache]: Analyzing trace with hash 811193304, now seen corresponding path program 1 times [2022-03-20 18:02:08,763 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:02:08,763 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [611637827] [2022-03-20 18:02:08,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:02:08,764 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:02:08,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:02:08,861 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:02:08,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:02:08,865 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:02:08,865 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:02:08,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [611637827] [2022-03-20 18:02:08,866 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [611637827] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:02:08,866 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:02:08,866 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:02:52,459 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:02:52,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [659531900] [2022-03-20 18:02:52,460 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [659531900] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:02:52,460 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:02:52,460 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-03-20 18:02:52,460 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523719630] [2022-03-20 18:02:52,460 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:02:52,460 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-03-20 18:02:52,460 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:02:52,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-03-20 18:02:52,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=1413, Unknown=3, NotChecked=0, Total=1560 [2022-03-20 18:02:52,461 INFO L87 Difference]: Start difference. First operand 57 states and 77 transitions. Second operand has 38 states, 37 states have (on average 1.3513513513513513) internal successors, (50), 36 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:03:38,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:03:38,258 INFO L93 Difference]: Finished difference Result 92 states and 140 transitions. [2022-03-20 18:03:38,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-03-20 18:03:38,259 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 1.3513513513513513) internal successors, (50), 36 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2022-03-20 18:03:38,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:03:38,259 INFO L225 Difference]: With dead ends: 92 [2022-03-20 18:03:38,259 INFO L226 Difference]: Without dead ends: 65 [2022-03-20 18:03:38,260 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 765 ImplicationChecksByTransitivity, 80.9s TimeCoverageRelationStatistics Valid=368, Invalid=4739, Unknown=5, NotChecked=0, Total=5112 [2022-03-20 18:03:38,261 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 36 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 1550 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 1641 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 1550 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:03:38,261 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 86 Invalid, 1641 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 1550 Invalid, 0 Unknown, 0 Unchecked, 8.3s Time] [2022-03-20 18:03:38,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-03-20 18:03:38,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2022-03-20 18:03:38,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 60 states have (on average 1.35) internal successors, (81), 60 states have internal predecessors, (81), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:03:38,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 85 transitions. [2022-03-20 18:03:38,277 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 85 transitions. Word has length 55 [2022-03-20 18:03:38,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:03:38,277 INFO L478 AbstractCegarLoop]: Abstraction has 65 states and 85 transitions. [2022-03-20 18:03:38,277 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 37 states have (on average 1.3513513513513513) internal successors, (50), 36 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:03:38,277 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 85 transitions. [2022-03-20 18:03:38,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-03-20 18:03:38,278 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:03:38,278 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:03:38,278 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-03-20 18:03:38,278 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:03:38,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:03:38,279 INFO L85 PathProgramCache]: Analyzing trace with hash -525598238, now seen corresponding path program 4 times [2022-03-20 18:03:38,279 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:03:38,279 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [55876975] [2022-03-20 18:03:38,429 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:03:38,429 INFO L85 PathProgramCache]: Analyzing trace with hash 870298648, now seen corresponding path program 1 times [2022-03-20 18:03:38,429 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:03:38,429 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [676204789] [2022-03-20 18:03:38,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:03:38,430 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:03:38,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:03:38,535 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:03:38,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:03:38,539 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:03:38,539 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:03:38,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [676204789] [2022-03-20 18:03:38,539 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [676204789] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:03:38,539 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:03:38,539 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:04:22,991 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:04:22,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [55876975] [2022-03-20 18:04:22,992 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [55876975] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:04:22,992 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:04:22,992 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-03-20 18:04:22,992 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52824916] [2022-03-20 18:04:22,992 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:04:22,992 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-03-20 18:04:22,992 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:04:22,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-03-20 18:04:22,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1647, Unknown=1, NotChecked=0, Total=1806 [2022-03-20 18:04:22,993 INFO L87 Difference]: Start difference. First operand 65 states and 85 transitions. Second operand has 41 states, 40 states have (on average 1.275) internal successors, (51), 39 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:04:26,060 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:04:34,596 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:04:53,968 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.09s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:05:12,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:05:12,521 INFO L93 Difference]: Finished difference Result 95 states and 137 transitions. [2022-03-20 18:05:12,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-03-20 18:05:12,522 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 1.275) internal successors, (51), 39 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2022-03-20 18:05:12,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:05:12,523 INFO L225 Difference]: With dead ends: 95 [2022-03-20 18:05:12,523 INFO L226 Difference]: Without dead ends: 68 [2022-03-20 18:05:12,524 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 930 ImplicationChecksByTransitivity, 78.4s TimeCoverageRelationStatistics Valid=406, Invalid=5598, Unknown=2, NotChecked=0, Total=6006 [2022-03-20 18:05:12,525 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 38 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 1545 mSolverCounterSat, 103 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 1650 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 1545 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:05:12,525 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 73 Invalid, 1650 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 1545 Invalid, 2 Unknown, 0 Unchecked, 15.4s Time] [2022-03-20 18:05:12,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-03-20 18:05:12,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2022-03-20 18:05:12,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 63 states have (on average 1.3333333333333333) internal successors, (84), 63 states have internal predecessors, (84), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:05:12,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 88 transitions. [2022-03-20 18:05:12,538 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 88 transitions. Word has length 55 [2022-03-20 18:05:12,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:05:12,538 INFO L478 AbstractCegarLoop]: Abstraction has 68 states and 88 transitions. [2022-03-20 18:05:12,538 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 40 states have (on average 1.275) internal successors, (51), 39 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:05:12,538 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 88 transitions. [2022-03-20 18:05:12,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-03-20 18:05:12,539 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:05:12,539 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:05:12,539 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-03-20 18:05:12,539 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:05:12,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:05:12,540 INFO L85 PathProgramCache]: Analyzing trace with hash -1860186853, now seen corresponding path program 5 times [2022-03-20 18:05:12,540 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:05:12,540 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1209805029] [2022-03-20 18:05:12,660 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:05:12,661 INFO L85 PathProgramCache]: Analyzing trace with hash 929403992, now seen corresponding path program 1 times [2022-03-20 18:05:12,661 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:05:12,661 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [958298222] [2022-03-20 18:05:12,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:05:12,661 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:05:12,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:05:12,801 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:05:12,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:05:12,812 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:05:12,812 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:05:12,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [958298222] [2022-03-20 18:05:12,812 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [958298222] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:05:12,812 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:05:12,812 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:06:11,018 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:06:11,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1209805029] [2022-03-20 18:06:11,018 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1209805029] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:06:11,018 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:06:11,018 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2022-03-20 18:06:11,018 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092043995] [2022-03-20 18:06:11,018 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:06:11,019 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-03-20 18:06:11,019 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:06:11,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-03-20 18:06:11,020 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=2359, Unknown=1, NotChecked=0, Total=2550 [2022-03-20 18:06:11,020 INFO L87 Difference]: Start difference. First operand 68 states and 88 transitions. Second operand has 49 states, 48 states have (on average 1.2708333333333333) internal successors, (61), 47 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:07:14,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:07:14,248 INFO L93 Difference]: Finished difference Result 103 states and 151 transitions. [2022-03-20 18:07:14,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-03-20 18:07:14,248 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 1.2708333333333333) internal successors, (61), 47 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 66 [2022-03-20 18:07:14,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:07:14,249 INFO L225 Difference]: With dead ends: 103 [2022-03-20 18:07:14,249 INFO L226 Difference]: Without dead ends: 76 [2022-03-20 18:07:14,250 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1333 ImplicationChecksByTransitivity, 109.7s TimeCoverageRelationStatistics Valid=494, Invalid=8247, Unknown=1, NotChecked=0, Total=8742 [2022-03-20 18:07:14,251 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 38 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 2502 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 2613 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 2502 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:07:14,251 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 111 Invalid, 2613 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 2502 Invalid, 0 Unknown, 0 Unchecked, 11.5s Time] [2022-03-20 18:07:14,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-03-20 18:07:14,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2022-03-20 18:07:14,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.295774647887324) internal successors, (92), 71 states have internal predecessors, (92), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:07:14,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 96 transitions. [2022-03-20 18:07:14,266 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 96 transitions. Word has length 66 [2022-03-20 18:07:14,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:07:14,267 INFO L478 AbstractCegarLoop]: Abstraction has 76 states and 96 transitions. [2022-03-20 18:07:14,267 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 48 states have (on average 1.2708333333333333) internal successors, (61), 47 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:07:14,271 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 96 transitions. [2022-03-20 18:07:14,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-03-20 18:07:14,274 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:07:14,274 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:07:14,274 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-03-20 18:07:14,275 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:07:14,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:07:14,275 INFO L85 PathProgramCache]: Analyzing trace with hash 133957853, now seen corresponding path program 6 times [2022-03-20 18:07:14,275 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:07:14,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [282631804] [2022-03-20 18:07:14,375 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:07:14,376 INFO L85 PathProgramCache]: Analyzing trace with hash 988509336, now seen corresponding path program 1 times [2022-03-20 18:07:14,376 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:07:14,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1172437123] [2022-03-20 18:07:14,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:07:14,376 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:07:14,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:07:14,473 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:07:14,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:07:14,477 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:07:14,477 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:07:14,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1172437123] [2022-03-20 18:07:14,477 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1172437123] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:07:14,477 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:07:14,477 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:08:32,651 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:08:32,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [282631804] [2022-03-20 18:08:32,651 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [282631804] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:08:32,651 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:08:32,651 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2022-03-20 18:08:32,651 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518631438] [2022-03-20 18:08:32,651 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:08:32,652 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-03-20 18:08:32,652 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:08:32,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-03-20 18:08:32,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=2656, Unknown=2, NotChecked=0, Total=2862 [2022-03-20 18:08:32,653 INFO L87 Difference]: Start difference. First operand 76 states and 96 transitions. Second operand has 52 states, 51 states have (on average 1.2156862745098038) internal successors, (62), 50 states have internal predecessors, (62), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:08:34,782 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:08:52,649 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:09:54,992 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:10:06,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:10:06,716 INFO L93 Difference]: Finished difference Result 117 states and 169 transitions. [2022-03-20 18:10:06,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-03-20 18:10:06,717 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 51 states have (on average 1.2156862745098038) internal successors, (62), 50 states have internal predecessors, (62), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 66 [2022-03-20 18:10:06,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:10:06,718 INFO L225 Difference]: With dead ends: 117 [2022-03-20 18:10:06,718 INFO L226 Difference]: Without dead ends: 90 [2022-03-20 18:10:06,720 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1542 ImplicationChecksByTransitivity, 147.6s TimeCoverageRelationStatistics Valid=531, Invalid=9366, Unknown=3, NotChecked=0, Total=9900 [2022-03-20 18:10:06,720 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 41 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 2663 mSolverCounterSat, 96 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 23.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 2762 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 2663 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 24.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:10:06,720 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 77 Invalid, 2762 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 2663 Invalid, 3 Unknown, 0 Unchecked, 24.4s Time] [2022-03-20 18:10:06,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-03-20 18:10:06,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 79. [2022-03-20 18:10:06,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.2837837837837838) internal successors, (95), 74 states have internal predecessors, (95), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:10:06,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 99 transitions. [2022-03-20 18:10:06,737 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 99 transitions. Word has length 66 [2022-03-20 18:10:06,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:10:06,737 INFO L478 AbstractCegarLoop]: Abstraction has 79 states and 99 transitions. [2022-03-20 18:10:06,737 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 51 states have (on average 1.2156862745098038) internal successors, (62), 50 states have internal predecessors, (62), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:10:06,737 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 99 transitions. [2022-03-20 18:10:06,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-03-20 18:10:06,738 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:10:06,738 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:10:06,738 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-03-20 18:10:06,738 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:10:06,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:10:06,738 INFO L85 PathProgramCache]: Analyzing trace with hash 1826433856, now seen corresponding path program 7 times [2022-03-20 18:10:06,739 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:10:06,739 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [802528082] [2022-03-20 18:10:06,837 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:10:06,837 INFO L85 PathProgramCache]: Analyzing trace with hash 1047614680, now seen corresponding path program 1 times [2022-03-20 18:10:06,838 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:10:06,838 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [168513400] [2022-03-20 18:10:06,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:10:06,838 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:10:06,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:10:06,967 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:10:06,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:10:06,972 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:10:06,972 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:10:06,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [168513400] [2022-03-20 18:10:06,973 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [168513400] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:10:06,973 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:10:06,973 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:11:47,717 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:11:47,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [802528082] [2022-03-20 18:11:47,718 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [802528082] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:11:47,718 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:11:47,718 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [60] imperfect sequences [] total 60 [2022-03-20 18:11:47,718 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336192335] [2022-03-20 18:11:47,718 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:11:47,718 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-03-20 18:11:47,718 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:11:47,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-03-20 18:11:47,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=3544, Unknown=2, NotChecked=0, Total=3782 [2022-03-20 18:11:47,720 INFO L87 Difference]: Start difference. First operand 79 states and 99 transitions. Second operand has 60 states, 59 states have (on average 1.2203389830508475) internal successors, (72), 58 states have internal predecessors, (72), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:12:30,338 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.22s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:12:33,575 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.12s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:13:02,303 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:13:33,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:13:33,010 INFO L93 Difference]: Finished difference Result 114 states and 162 transitions. [2022-03-20 18:13:33,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-03-20 18:13:33,010 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 59 states have (on average 1.2203389830508475) internal successors, (72), 58 states have internal predecessors, (72), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2022-03-20 18:13:33,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:13:33,012 INFO L225 Difference]: With dead ends: 114 [2022-03-20 18:13:33,012 INFO L226 Difference]: Without dead ends: 87 [2022-03-20 18:13:33,014 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2055 ImplicationChecksByTransitivity, 174.9s TimeCoverageRelationStatistics Valid=619, Invalid=12719, Unknown=2, NotChecked=0, Total=13340 [2022-03-20 18:13:33,015 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 42 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 3484 mSolverCounterSat, 130 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 28.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 3615 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 130 IncrementalHoareTripleChecker+Valid, 3484 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 30.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:13:33,015 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 71 Invalid, 3615 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [130 Valid, 3484 Invalid, 1 Unknown, 0 Unchecked, 30.9s Time] [2022-03-20 18:13:33,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-03-20 18:13:33,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2022-03-20 18:13:33,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.2560975609756098) internal successors, (103), 82 states have internal predecessors, (103), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:13:33,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 107 transitions. [2022-03-20 18:13:33,033 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 107 transitions. Word has length 77 [2022-03-20 18:13:33,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:13:33,033 INFO L478 AbstractCegarLoop]: Abstraction has 87 states and 107 transitions. [2022-03-20 18:13:33,034 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 59 states have (on average 1.2203389830508475) internal successors, (72), 58 states have internal predecessors, (72), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:13:33,034 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 107 transitions. [2022-03-20 18:13:33,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-03-20 18:13:33,034 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:13:33,034 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:13:33,034 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-03-20 18:13:33,034 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:13:33,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:13:33,035 INFO L85 PathProgramCache]: Analyzing trace with hash -474388734, now seen corresponding path program 8 times [2022-03-20 18:13:33,035 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:13:33,035 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [756199898] [2022-03-20 18:13:33,150 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:13:33,150 INFO L85 PathProgramCache]: Analyzing trace with hash 1106720024, now seen corresponding path program 1 times [2022-03-20 18:13:33,150 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:13:33,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [237878533] [2022-03-20 18:13:33,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:13:33,151 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:13:33,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:13:33,307 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:13:33,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:13:33,310 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:13:33,310 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:13:33,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [237878533] [2022-03-20 18:13:33,310 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [237878533] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:13:33,310 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:13:33,310 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:15:02,217 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:02,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [756199898] [2022-03-20 18:15:02,218 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [756199898] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:02,218 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:02,218 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [62] imperfect sequences [] total 62 [2022-03-20 18:15:02,218 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965064927] [2022-03-20 18:15:02,218 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:02,218 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2022-03-20 18:15:02,218 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:02,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2022-03-20 18:15:02,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=244, Invalid=3788, Unknown=0, NotChecked=0, Total=4032 [2022-03-20 18:15:02,219 INFO L87 Difference]: Start difference. First operand 87 states and 107 transitions. Second operand has 62 states, 61 states have (on average 1.1967213114754098) internal successors, (73), 60 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)