/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/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/sumt9.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-6c470ae [2022-02-14 16:35:31,010 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-02-14 16:35:31,012 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-02-14 16:35:31,081 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-02-14 16:35:31,127 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2022-02-14 16:35:31,156 INFO L113 SettingsManager]: Loading preferences was successful [2022-02-14 16:35:31,156 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-02-14 16:35:31,157 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-02-14 16:35:31,157 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-02-14 16:35:31,157 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-02-14 16:35:31,157 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-02-14 16:35:31,158 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-02-14 16:35:31,158 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-02-14 16:35:31,158 INFO L138 SettingsManager]: * Use SBE=true [2022-02-14 16:35:31,158 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-02-14 16:35:31,158 INFO L138 SettingsManager]: * sizeof long=4 [2022-02-14 16:35:31,159 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-02-14 16:35:31,159 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-02-14 16:35:31,165 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-02-14 16:35:31,165 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-02-14 16:35:31,165 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-02-14 16:35:31,165 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-02-14 16:35:31,165 INFO L138 SettingsManager]: * sizeof long double=12 [2022-02-14 16:35:31,165 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-02-14 16:35:31,165 INFO L138 SettingsManager]: * Use constant arrays=true [2022-02-14 16:35:31,166 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-02-14 16:35:31,166 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-02-14 16:35:31,166 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-02-14 16:35:31,166 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-02-14 16:35:31,167 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-02-14 16:35:31,168 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-02-14 16:35:31,168 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-02-14 16:35:31,168 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-02-14 16:35:31,168 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-02-14 16:35:31,169 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-02-14 16:35:31,169 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2022-02-14 16:35:31,169 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-02-14 16:35:31,169 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-02-14 16:35:31,169 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-02-14 16:35:31,384 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-02-14 16:35:31,404 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-02-14 16:35:31,406 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-02-14 16:35:31,407 INFO L271 PluginConnector]: Initializing CDTParser... [2022-02-14 16:35:31,409 INFO L275 PluginConnector]: CDTParser initialized [2022-02-14 16:35:31,410 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/sumt9.c [2022-02-14 16:35:31,463 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/449cd3445/0c01983c502a458f96084ca9cca92514/FLAG21ccf96f6 [2022-02-14 16:35:31,840 INFO L306 CDTParser]: Found 1 translation units. [2022-02-14 16:35:31,841 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/sumt9.c [2022-02-14 16:35:31,846 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/449cd3445/0c01983c502a458f96084ca9cca92514/FLAG21ccf96f6 [2022-02-14 16:35:31,858 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/449cd3445/0c01983c502a458f96084ca9cca92514 [2022-02-14 16:35:31,860 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-02-14 16:35:31,861 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-02-14 16:35:31,864 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-02-14 16:35:31,865 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-02-14 16:35:31,868 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-02-14 16:35:31,868 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.02 04:35:31" (1/1) ... [2022-02-14 16:35:31,869 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2220a9b7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.02 04:35:31, skipping insertion in model container [2022-02-14 16:35:31,869 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.02 04:35:31" (1/1) ... [2022-02-14 16:35:31,875 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-02-14 16:35:31,888 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-02-14 16:35:32,009 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/sumt9.c[403,416] [2022-02-14 16:35:32,041 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-02-14 16:35:32,063 INFO L203 MainTranslator]: Completed pre-run [2022-02-14 16:35:32,072 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/sumt9.c[403,416] [2022-02-14 16:35:32,082 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-02-14 16:35:32,090 INFO L208 MainTranslator]: Completed translation [2022-02-14 16:35:32,090 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.02 04:35:32 WrapperNode [2022-02-14 16:35:32,091 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-02-14 16:35:32,091 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-02-14 16:35:32,091 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-02-14 16:35:32,092 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-02-14 16:35:32,098 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.02 04:35:32" (1/1) ... [2022-02-14 16:35:32,098 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.02 04:35:32" (1/1) ... [2022-02-14 16:35:32,103 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.02 04:35:32" (1/1) ... [2022-02-14 16:35:32,103 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.02 04:35:32" (1/1) ... [2022-02-14 16:35:32,107 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.02 04:35:32" (1/1) ... [2022-02-14 16:35:32,110 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.02 04:35:32" (1/1) ... [2022-02-14 16:35:32,112 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.02 04:35:32" (1/1) ... [2022-02-14 16:35:32,114 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-02-14 16:35:32,119 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-02-14 16:35:32,119 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-02-14 16:35:32,120 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-02-14 16:35:32,121 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.02 04:35:32" (1/1) ... [2022-02-14 16:35:32,132 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-02-14 16:35:32,140 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-14 16:35:32,152 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-02-14 16:35:32,174 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-02-14 16:35:32,193 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-02-14 16:35:32,194 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-02-14 16:35:32,194 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-02-14 16:35:32,194 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-02-14 16:35:32,195 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-02-14 16:35:32,196 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-02-14 16:35:32,197 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-02-14 16:35:32,197 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-02-14 16:35:32,197 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-02-14 16:35:32,197 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-02-14 16:35:32,197 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-02-14 16:35:32,197 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-02-14 16:35:32,197 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-02-14 16:35:32,197 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-02-14 16:35:32,197 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-02-14 16:35:32,198 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-02-14 16:35:32,198 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-02-14 16:35:32,198 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-02-14 16:35:32,198 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-02-14 16:35:32,198 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-02-14 16:35:32,259 INFO L234 CfgBuilder]: Building ICFG [2022-02-14 16:35:32,261 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-02-14 16:35:43,235 INFO L275 CfgBuilder]: Performing block encoding [2022-02-14 16:35:43,242 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-02-14 16:35:43,242 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-02-14 16:35:43,243 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.02 04:35:43 BoogieIcfgContainer [2022-02-14 16:35:43,244 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-02-14 16:35:43,245 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-02-14 16:35:43,245 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-02-14 16:35:43,248 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-02-14 16:35:43,248 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.02 04:35:31" (1/3) ... [2022-02-14 16:35:43,248 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6831c20e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.02 04:35:43, skipping insertion in model container [2022-02-14 16:35:43,249 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.02 04:35:32" (2/3) ... [2022-02-14 16:35:43,249 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6831c20e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.02 04:35:43, skipping insertion in model container [2022-02-14 16:35:43,249 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.02 04:35:43" (3/3) ... [2022-02-14 16:35:43,250 INFO L111 eAbstractionObserver]: Analyzing ICFG sumt9.c [2022-02-14 16:35:43,253 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-02-14 16:35:43,253 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-02-14 16:35:43,286 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-02-14 16:35:43,292 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2022-02-14 16:35:43,292 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-02-14 16:35:43,306 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 21 states have (on average 1.619047619047619) internal successors, (34), 23 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) [2022-02-14 16:35:43,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-02-14 16:35:43,309 INFO L506 BasicCegarLoop]: Found error trace [2022-02-14 16:35:43,310 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-14 16:35:43,310 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-14 16:35:43,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-14 16:35:43,315 INFO L85 PathProgramCache]: Analyzing trace with hash 701348598, now seen corresponding path program 1 times [2022-02-14 16:35:43,322 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-14 16:35:43,322 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1699501530] [2022-02-14 16:35:43,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:35:43,323 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-14 16:35:43,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:35:44,050 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-14 16:35:44,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:35:44,061 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-14 16:35:44,061 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-14 16:35:44,061 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1699501530] [2022-02-14 16:35:44,062 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1699501530] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-14 16:35:44,062 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-14 16:35:44,062 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-02-14 16:35:44,064 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1513816657] [2022-02-14 16:35:44,064 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-14 16:35:44,067 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-02-14 16:35:44,068 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-14 16:35:44,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-02-14 16:35:44,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-02-14 16:35:44,098 INFO L87 Difference]: Start difference. First operand has 29 states, 21 states have (on average 1.619047619047619) internal successors, (34), 23 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 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-14 16:35:46,257 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 [] [2022-02-14 16:35:48,530 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:35:50,683 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:35:52,854 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:35:55,016 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:35:57,168 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:35:59,331 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:36:01,550 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:36:03,716 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.17s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:36:05,943 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:36:08,164 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:36:08,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-14 16:36:08,290 INFO L93 Difference]: Finished difference Result 67 states and 97 transitions. [2022-02-14 16:36:08,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-02-14 16:36:08,292 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2022-02-14 16:36:08,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-14 16:36:08,298 INFO L225 Difference]: With dead ends: 67 [2022-02-14 16:36:08,298 INFO L226 Difference]: Without dead ends: 34 [2022-02-14 16:36:08,300 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2022-02-14 16:36:08,302 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 53 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 12 mSolverCounterUnsat, 11 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 22.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 11 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 24.0s IncrementalHoareTripleChecker+Time [2022-02-14 16:36:08,303 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 65 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 149 Invalid, 11 Unknown, 0 Unchecked, 24.0s Time] [2022-02-14 16:36:08,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-02-14 16:36:08,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2022-02-14 16:36:08,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 25 states have internal predecessors, (34), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-02-14 16:36:08,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 41 transitions. [2022-02-14 16:36:08,334 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 41 transitions. Word has length 14 [2022-02-14 16:36:08,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-14 16:36:08,334 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 41 transitions. [2022-02-14 16:36:08,334 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-14 16:36:08,334 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 41 transitions. [2022-02-14 16:36:08,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-02-14 16:36:08,335 INFO L506 BasicCegarLoop]: Found error trace [2022-02-14 16:36:08,335 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-14 16:36:08,336 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-02-14 16:36:08,336 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-14 16:36:08,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-14 16:36:08,337 INFO L85 PathProgramCache]: Analyzing trace with hash 1047670141, now seen corresponding path program 1 times [2022-02-14 16:36:08,337 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-14 16:36:08,337 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1415934078] [2022-02-14 16:36:08,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:36:08,337 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-14 16:36:08,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:36:08,545 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-14 16:36:08,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:36:08,569 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-14 16:36:08,570 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-14 16:36:08,570 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1415934078] [2022-02-14 16:36:08,570 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1415934078] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-14 16:36:08,570 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-14 16:36:08,570 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-02-14 16:36:08,570 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [676122074] [2022-02-14 16:36:08,571 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-14 16:36:08,572 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-02-14 16:36:08,572 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-14 16:36:08,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-02-14 16:36:08,572 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-02-14 16:36:08,573 INFO L87 Difference]: Start difference. First operand 32 states and 41 transitions. Second operand has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 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) [2022-02-14 16:36:10,663 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:36:12,768 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:36:14,945 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:36:17,126 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:36:19,308 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:36:21,482 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:36:21,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-14 16:36:21,595 INFO L93 Difference]: Finished difference Result 49 states and 66 transitions. [2022-02-14 16:36:21,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-14 16:36:21,596 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 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) Word has length 15 [2022-02-14 16:36:21,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-14 16:36:21,598 INFO L225 Difference]: With dead ends: 49 [2022-02-14 16:36:21,598 INFO L226 Difference]: Without dead ends: 32 [2022-02-14 16:36:21,599 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2022-02-14 16:36:21,600 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 88 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 12 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.0s IncrementalHoareTripleChecker+Time [2022-02-14 16:36:21,600 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 34 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 26 Invalid, 6 Unknown, 0 Unchecked, 13.0s Time] [2022-02-14 16:36:21,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-02-14 16:36:21,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-02-14 16:36:21,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 24 states have (on average 1.375) internal successors, (33), 25 states have internal predecessors, (33), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-02-14 16:36:21,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2022-02-14 16:36:21,608 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 15 [2022-02-14 16:36:21,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-14 16:36:21,609 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2022-02-14 16:36:21,609 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 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) [2022-02-14 16:36:21,609 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2022-02-14 16:36:21,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-02-14 16:36:21,610 INFO L506 BasicCegarLoop]: Found error trace [2022-02-14 16:36:21,610 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-14 16:36:21,610 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-02-14 16:36:21,610 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-14 16:36:21,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-14 16:36:21,611 INFO L85 PathProgramCache]: Analyzing trace with hash -133245550, now seen corresponding path program 1 times [2022-02-14 16:36:21,611 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-14 16:36:21,611 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1282436743] [2022-02-14 16:36:21,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:36:21,612 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-14 16:36:21,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:36:21,731 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-14 16:36:21,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:36:21,737 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-02-14 16:36:21,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:36:21,745 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-14 16:36:21,745 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-14 16:36:21,745 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1282436743] [2022-02-14 16:36:21,745 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1282436743] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-14 16:36:21,745 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1481396292] [2022-02-14 16:36:21,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:36:21,746 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:36:21,746 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-14 16:36:21,751 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-14 16:36:21,780 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-02-14 16:36:21,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:36:21,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 31 conjunts are in the unsatisfiable core [2022-02-14 16:36:21,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-14 16:36:22,458 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-14 16:36:22,458 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-14 16:36:22,684 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-02-14 16:36:22,684 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1481396292] provided 1 perfect and 1 imperfect interpolant sequences [2022-02-14 16:36:22,685 INFO L191 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-02-14 16:36:22,685 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 9] total 14 [2022-02-14 16:36:22,685 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718170410] [2022-02-14 16:36:22,685 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-14 16:36:22,685 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-14 16:36:22,685 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-14 16:36:22,686 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-14 16:36:22,686 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-02-14 16:36:22,686 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:36:24,736 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:36:26,914 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:36:29,075 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:36:31,236 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:36:33,409 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.17s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:36:35,536 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:36:37,699 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:36:39,882 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:36:42,046 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:36:42,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-14 16:36:42,231 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2022-02-14 16:36:42,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-14 16:36:42,232 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 22 [2022-02-14 16:36:42,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-14 16:36:42,233 INFO L225 Difference]: With dead ends: 42 [2022-02-14 16:36:42,233 INFO L226 Difference]: Without dead ends: 40 [2022-02-14 16:36:42,233 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 37 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2022-02-14 16:36:42,234 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 5 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 0 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.5s IncrementalHoareTripleChecker+Time [2022-02-14 16:36:42,239 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 98 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 51 Invalid, 9 Unknown, 0 Unchecked, 19.5s Time] [2022-02-14 16:36:42,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-02-14 16:36:42,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 34. [2022-02-14 16:36:42,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 26 states have (on average 1.3846153846153846) internal successors, (36), 26 states have internal predecessors, (36), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-02-14 16:36:42,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 43 transitions. [2022-02-14 16:36:42,247 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 43 transitions. Word has length 22 [2022-02-14 16:36:42,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-14 16:36:42,248 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 43 transitions. [2022-02-14 16:36:42,248 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:36:42,248 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 43 transitions. [2022-02-14 16:36:42,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-02-14 16:36:42,249 INFO L506 BasicCegarLoop]: Found error trace [2022-02-14 16:36:42,249 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-14 16:36:42,274 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-02-14 16:36:42,449 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:36:42,450 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-14 16:36:42,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-14 16:36:42,450 INFO L85 PathProgramCache]: Analyzing trace with hash 945055329, now seen corresponding path program 1 times [2022-02-14 16:36:42,450 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-14 16:36:42,450 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1399181429] [2022-02-14 16:36:42,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:36:42,451 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-14 16:36:42,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:36:42,532 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-14 16:36:42,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:36:42,538 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-02-14 16:36:42,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:36:42,549 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-14 16:36:42,549 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-14 16:36:42,549 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1399181429] [2022-02-14 16:36:42,549 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1399181429] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-14 16:36:42,549 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [92535994] [2022-02-14 16:36:42,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:36:42,550 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:36:42,550 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-14 16:36:42,551 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-14 16:36:42,552 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-02-14 16:36:42,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:36:42,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 31 conjunts are in the unsatisfiable core [2022-02-14 16:36:42,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-14 16:36:43,127 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-14 16:36:43,127 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-14 16:36:43,320 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-02-14 16:36:43,321 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [92535994] provided 1 perfect and 1 imperfect interpolant sequences [2022-02-14 16:36:43,321 INFO L191 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-02-14 16:36:43,321 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 9] total 14 [2022-02-14 16:36:43,321 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555170373] [2022-02-14 16:36:43,321 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-14 16:36:43,322 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-14 16:36:43,322 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-14 16:36:43,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-14 16:36:43,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-02-14 16:36:43,323 INFO L87 Difference]: Start difference. First operand 34 states and 43 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:36:45,364 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 [] [2022-02-14 16:36:47,532 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:36:49,656 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:36:51,837 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:36:53,948 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:36:56,107 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:36:58,279 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:37:00,462 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:37:02,624 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:37:04,808 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 [] [2022-02-14 16:37:04,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-14 16:37:04,928 INFO L93 Difference]: Finished difference Result 46 states and 58 transitions. [2022-02-14 16:37:04,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-14 16:37:04,929 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 23 [2022-02-14 16:37:04,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-14 16:37:04,930 INFO L225 Difference]: With dead ends: 46 [2022-02-14 16:37:04,930 INFO L226 Difference]: Without dead ends: 44 [2022-02-14 16:37:04,930 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 39 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2022-02-14 16:37:04,931 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 6 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 0 mSolverCounterUnsat, 10 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 10 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.6s IncrementalHoareTripleChecker+Time [2022-02-14 16:37:04,932 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 86 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 59 Invalid, 10 Unknown, 0 Unchecked, 21.6s Time] [2022-02-14 16:37:04,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-02-14 16:37:04,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 35. [2022-02-14 16:37:04,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 27 states have internal predecessors, (38), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-02-14 16:37:04,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2022-02-14 16:37:04,939 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 23 [2022-02-14 16:37:04,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-14 16:37:04,940 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2022-02-14 16:37:04,940 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:37:04,940 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2022-02-14 16:37:04,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-02-14 16:37:04,940 INFO L506 BasicCegarLoop]: Found error trace [2022-02-14 16:37:04,941 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-14 16:37:04,967 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-02-14 16:37:05,155 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2022-02-14 16:37:05,156 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-14 16:37:05,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-14 16:37:05,156 INFO L85 PathProgramCache]: Analyzing trace with hash 155789965, now seen corresponding path program 1 times [2022-02-14 16:37:05,156 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-14 16:37:05,156 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [224076572] [2022-02-14 16:37:05,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:37:05,157 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-14 16:37:05,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:37:05,309 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-14 16:37:05,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:37:05,313 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-02-14 16:37:05,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:37:05,319 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-14 16:37:05,319 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-14 16:37:05,319 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [224076572] [2022-02-14 16:37:05,319 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [224076572] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-14 16:37:05,319 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1113633771] [2022-02-14 16:37:05,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:37:05,319 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:37:05,320 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-14 16:37:05,321 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-14 16:37:05,322 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-02-14 16:37:05,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:37:05,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 31 conjunts are in the unsatisfiable core [2022-02-14 16:37:05,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-14 16:37:05,915 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-14 16:37:05,916 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-14 16:37:06,120 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-02-14 16:37:06,120 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1113633771] provided 1 perfect and 1 imperfect interpolant sequences [2022-02-14 16:37:06,121 INFO L191 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-02-14 16:37:06,121 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 9] total 14 [2022-02-14 16:37:06,121 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805372249] [2022-02-14 16:37:06,121 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-14 16:37:06,121 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-14 16:37:06,121 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-14 16:37:06,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-14 16:37:06,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-02-14 16:37:06,122 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:37:08,165 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 [] [2022-02-14 16:37:10,352 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:37:12,511 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:37:14,625 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:37:16,781 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:37:18,954 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:37:21,116 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:37:23,295 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:37:25,454 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:37:25,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-14 16:37:25,642 INFO L93 Difference]: Finished difference Result 47 states and 60 transitions. [2022-02-14 16:37:25,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-14 16:37:25,645 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 24 [2022-02-14 16:37:25,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-14 16:37:25,645 INFO L225 Difference]: With dead ends: 47 [2022-02-14 16:37:25,645 INFO L226 Difference]: Without dead ends: 45 [2022-02-14 16:37:25,646 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2022-02-14 16:37:25,646 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 5 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 1 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.5s IncrementalHoareTripleChecker+Time [2022-02-14 16:37:25,647 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 86 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 59 Invalid, 9 Unknown, 0 Unchecked, 19.5s Time] [2022-02-14 16:37:25,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-02-14 16:37:25,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 36. [2022-02-14 16:37:25,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-02-14 16:37:25,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 47 transitions. [2022-02-14 16:37:25,656 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 47 transitions. Word has length 24 [2022-02-14 16:37:25,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-14 16:37:25,657 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 47 transitions. [2022-02-14 16:37:25,657 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:37:25,657 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 47 transitions. [2022-02-14 16:37:25,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-02-14 16:37:25,657 INFO L506 BasicCegarLoop]: Found error trace [2022-02-14 16:37:25,658 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-14 16:37:25,687 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-02-14 16:37:25,875 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:37:25,875 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-14 16:37:25,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-14 16:37:25,876 INFO L85 PathProgramCache]: Analyzing trace with hash 1601513212, now seen corresponding path program 1 times [2022-02-14 16:37:25,876 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-14 16:37:25,876 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1521178156] [2022-02-14 16:37:25,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:37:25,876 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-14 16:37:25,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:37:26,123 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-14 16:37:26,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:37:26,148 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-02-14 16:37:26,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:37:26,154 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-14 16:37:26,154 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-14 16:37:26,154 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1521178156] [2022-02-14 16:37:26,154 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1521178156] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-14 16:37:26,154 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [765544417] [2022-02-14 16:37:26,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:37:26,155 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:37:26,155 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-14 16:37:26,156 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-14 16:37:26,161 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-02-14 16:37:26,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:37:26,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 31 conjunts are in the unsatisfiable core [2022-02-14 16:37:26,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-14 16:37:26,839 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-14 16:37:26,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-14 16:37:27,101 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-02-14 16:37:27,102 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [765544417] provided 1 perfect and 1 imperfect interpolant sequences [2022-02-14 16:37:27,102 INFO L191 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-02-14 16:37:27,102 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 9] total 18 [2022-02-14 16:37:27,102 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359677557] [2022-02-14 16:37:27,102 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-14 16:37:27,103 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-14 16:37:27,103 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-14 16:37:27,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-14 16:37:27,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2022-02-14 16:37:27,103 INFO L87 Difference]: Start difference. First operand 36 states and 47 transitions. Second operand has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:37:29,149 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:37:31,336 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:37:33,448 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:37:35,614 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:37:37,777 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:37:39,938 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:37:42,121 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:37:44,280 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:37:46,471 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:37:48,585 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:37:48,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-14 16:37:48,586 INFO L93 Difference]: Finished difference Result 59 states and 77 transitions. [2022-02-14 16:37:48,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-14 16:37:48,690 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2022-02-14 16:37:48,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-14 16:37:48,691 INFO L225 Difference]: With dead ends: 59 [2022-02-14 16:37:48,691 INFO L226 Difference]: Without dead ends: 57 [2022-02-14 16:37:48,691 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 42 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2022-02-14 16:37:48,692 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 5 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 1 mSolverCounterUnsat, 10 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 10 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.5s IncrementalHoareTripleChecker+Time [2022-02-14 16:37:48,692 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 80 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 61 Invalid, 10 Unknown, 0 Unchecked, 21.5s Time] [2022-02-14 16:37:48,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-02-14 16:37:48,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-02-14 16:37:48,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 45 states have (on average 1.4222222222222223) internal successors, (64), 45 states have internal predecessors, (64), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-14 16:37:48,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 75 transitions. [2022-02-14 16:37:48,703 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 75 transitions. Word has length 25 [2022-02-14 16:37:48,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-14 16:37:48,703 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 75 transitions. [2022-02-14 16:37:48,704 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:37:48,704 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 75 transitions. [2022-02-14 16:37:48,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-02-14 16:37:48,704 INFO L506 BasicCegarLoop]: Found error trace [2022-02-14 16:37:48,704 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-14 16:37:48,722 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-02-14 16:37:48,911 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:37:48,911 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-14 16:37:48,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-14 16:37:48,912 INFO L85 PathProgramCache]: Analyzing trace with hash -682560632, now seen corresponding path program 1 times [2022-02-14 16:37:48,912 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-14 16:37:48,912 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [614754346] [2022-02-14 16:37:48,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:37:48,912 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-14 16:37:48,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:37:49,145 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-14 16:37:49,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:37:49,178 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-02-14 16:37:49,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:37:49,184 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-14 16:37:49,185 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-14 16:37:49,185 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [614754346] [2022-02-14 16:37:49,185 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [614754346] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-14 16:37:49,185 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1529091076] [2022-02-14 16:37:49,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:37:49,185 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:37:49,185 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-14 16:37:49,188 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-14 16:37:49,216 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-02-14 16:37:49,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:37:49,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 31 conjunts are in the unsatisfiable core [2022-02-14 16:37:49,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-14 16:37:49,815 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-14 16:37:49,815 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-14 16:37:50,098 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-02-14 16:37:50,098 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1529091076] provided 1 perfect and 1 imperfect interpolant sequences [2022-02-14 16:37:50,098 INFO L191 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-02-14 16:37:50,098 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 9] total 18 [2022-02-14 16:37:50,098 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1832244897] [2022-02-14 16:37:50,098 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-14 16:37:50,098 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-14 16:37:50,099 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-14 16:37:50,099 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-14 16:37:50,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2022-02-14 16:37:50,099 INFO L87 Difference]: Start difference. First operand 57 states and 75 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:37:52,134 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:37:54,322 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:37:56,425 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:37:58,540 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:38:00,703 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:38:02,820 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:38:04,985 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:38:07,169 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:38:09,331 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:38:09,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-14 16:38:09,525 INFO L93 Difference]: Finished difference Result 72 states and 96 transitions. [2022-02-14 16:38:09,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-14 16:38:09,526 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 26 [2022-02-14 16:38:09,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-14 16:38:09,527 INFO L225 Difference]: With dead ends: 72 [2022-02-14 16:38:09,527 INFO L226 Difference]: Without dead ends: 70 [2022-02-14 16:38:09,527 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 44 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2022-02-14 16:38:09,528 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 5 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 1 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.4s IncrementalHoareTripleChecker+Time [2022-02-14 16:38:09,528 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 75 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 65 Invalid, 9 Unknown, 0 Unchecked, 19.4s Time] [2022-02-14 16:38:09,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-02-14 16:38:09,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2022-02-14 16:38:09,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 56 states have (on average 1.4464285714285714) internal successors, (81), 56 states have internal predecessors, (81), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-02-14 16:38:09,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 94 transitions. [2022-02-14 16:38:09,538 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 94 transitions. Word has length 26 [2022-02-14 16:38:09,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-14 16:38:09,539 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 94 transitions. [2022-02-14 16:38:09,539 INFO L471 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:38:09,539 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 94 transitions. [2022-02-14 16:38:09,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-02-14 16:38:09,540 INFO L506 BasicCegarLoop]: Found error trace [2022-02-14 16:38:09,540 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-14 16:38:09,564 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-02-14 16:38:09,762 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:38:09,762 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-14 16:38:09,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-14 16:38:09,763 INFO L85 PathProgramCache]: Analyzing trace with hash 1668739991, now seen corresponding path program 1 times [2022-02-14 16:38:09,763 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-14 16:38:09,763 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1943857303] [2022-02-14 16:38:09,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:38:09,764 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-14 16:38:09,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:38:09,817 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-14 16:38:09,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:38:09,821 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-02-14 16:38:09,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:38:09,825 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-14 16:38:09,825 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-14 16:38:09,825 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1943857303] [2022-02-14 16:38:09,825 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1943857303] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-14 16:38:09,825 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [398347788] [2022-02-14 16:38:09,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:38:09,826 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:38:09,826 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-14 16:38:09,827 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-14 16:38:09,828 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-02-14 16:38:09,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:38:09,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 31 conjunts are in the unsatisfiable core [2022-02-14 16:38:09,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-14 16:38:10,409 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-14 16:38:10,409 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-14 16:38:10,557 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-02-14 16:38:10,557 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [398347788] provided 1 perfect and 1 imperfect interpolant sequences [2022-02-14 16:38:10,557 INFO L191 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-02-14 16:38:10,557 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 9] total 14 [2022-02-14 16:38:10,557 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [429329003] [2022-02-14 16:38:10,557 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-14 16:38:10,558 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-14 16:38:10,558 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-14 16:38:10,558 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-14 16:38:10,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-02-14 16:38:10,558 INFO L87 Difference]: Start difference. First operand 70 states and 94 transitions. Second operand has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:38:12,599 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 [] [2022-02-14 16:38:14,775 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:38:16,879 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:38:18,997 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:38:21,160 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:38:23,272 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:38:25,383 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:38:27,546 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:38:29,709 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:38:31,844 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:38:33,955 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:38:36,138 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 [] [2022-02-14 16:38:36,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-14 16:38:36,253 INFO L93 Difference]: Finished difference Result 87 states and 119 transitions. [2022-02-14 16:38:36,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-14 16:38:36,253 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 27 [2022-02-14 16:38:36,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-14 16:38:36,254 INFO L225 Difference]: With dead ends: 87 [2022-02-14 16:38:36,254 INFO L226 Difference]: Without dead ends: 85 [2022-02-14 16:38:36,254 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 47 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2022-02-14 16:38:36,255 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 6 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 1 mSolverCounterUnsat, 12 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 24.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 12 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 25.7s IncrementalHoareTripleChecker+Time [2022-02-14 16:38:36,255 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 62 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 68 Invalid, 12 Unknown, 0 Unchecked, 25.7s Time] [2022-02-14 16:38:36,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-02-14 16:38:36,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 84. [2022-02-14 16:38:36,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 68 states have (on average 1.4705882352941178) internal successors, (100), 68 states have internal predecessors, (100), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-02-14 16:38:36,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 115 transitions. [2022-02-14 16:38:36,266 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 115 transitions. Word has length 27 [2022-02-14 16:38:36,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-14 16:38:36,266 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 115 transitions. [2022-02-14 16:38:36,267 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:38:36,267 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 115 transitions. [2022-02-14 16:38:36,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-02-14 16:38:36,268 INFO L506 BasicCegarLoop]: Found error trace [2022-02-14 16:38:36,268 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-14 16:38:36,284 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-02-14 16:38:36,471 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:38:36,471 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-14 16:38:36,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-14 16:38:36,472 INFO L85 PathProgramCache]: Analyzing trace with hash 1687761027, now seen corresponding path program 1 times [2022-02-14 16:38:36,472 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-14 16:38:36,472 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1176167460] [2022-02-14 16:38:36,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:38:36,472 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-14 16:38:36,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:38:36,646 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-14 16:38:36,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:38:36,672 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-02-14 16:38:36,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:38:36,677 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-14 16:38:36,678 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-14 16:38:36,678 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1176167460] [2022-02-14 16:38:36,678 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1176167460] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-14 16:38:36,678 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2073432142] [2022-02-14 16:38:36,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:38:36,678 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:38:36,678 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-14 16:38:36,679 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-14 16:38:36,681 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-02-14 16:38:36,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:38:36,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 31 conjunts are in the unsatisfiable core [2022-02-14 16:38:36,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-14 16:38:37,277 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-14 16:38:37,277 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-14 16:38:37,475 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-02-14 16:38:37,476 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2073432142] provided 1 perfect and 1 imperfect interpolant sequences [2022-02-14 16:38:37,476 INFO L191 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-02-14 16:38:37,476 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 9] total 18 [2022-02-14 16:38:37,476 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1380509490] [2022-02-14 16:38:37,476 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-14 16:38:37,476 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-14 16:38:37,476 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-14 16:38:37,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-14 16:38:37,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2022-02-14 16:38:37,477 INFO L87 Difference]: Start difference. First operand 84 states and 115 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:38:39,507 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 [] [2022-02-14 16:38:41,733 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:38:43,846 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:38:46,010 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:38:48,117 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:38:50,287 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:38:52,458 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:38:54,596 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 [] [2022-02-14 16:38:54,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-14 16:38:54,792 INFO L93 Difference]: Finished difference Result 100 states and 138 transitions. [2022-02-14 16:38:54,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-14 16:38:54,792 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2022-02-14 16:38:54,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-14 16:38:54,793 INFO L225 Difference]: With dead ends: 100 [2022-02-14 16:38:54,794 INFO L226 Difference]: Without dead ends: 98 [2022-02-14 16:38:54,794 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 48 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2022-02-14 16:38:54,795 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 5 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 2 mSolverCounterUnsat, 8 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 8 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.3s IncrementalHoareTripleChecker+Time [2022-02-14 16:38:54,795 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 62 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 72 Invalid, 8 Unknown, 0 Unchecked, 17.3s Time] [2022-02-14 16:38:54,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-02-14 16:38:54,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 85. [2022-02-14 16:38:54,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 69 states have (on average 1.4782608695652173) internal successors, (102), 69 states have internal predecessors, (102), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-02-14 16:38:54,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 117 transitions. [2022-02-14 16:38:54,805 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 117 transitions. Word has length 28 [2022-02-14 16:38:54,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-14 16:38:54,805 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 117 transitions. [2022-02-14 16:38:54,805 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:38:54,806 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 117 transitions. [2022-02-14 16:38:54,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-02-14 16:38:54,806 INFO L506 BasicCegarLoop]: Found error trace [2022-02-14 16:38:54,806 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-14 16:38:54,831 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-02-14 16:38:55,029 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:38:55,029 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-14 16:38:55,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-14 16:38:55,030 INFO L85 PathProgramCache]: Analyzing trace with hash -1874408398, now seen corresponding path program 1 times [2022-02-14 16:38:55,030 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-14 16:38:55,030 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657526812] [2022-02-14 16:38:55,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:38:55,030 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-14 16:38:55,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:38:55,095 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-14 16:38:55,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:38:55,099 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-02-14 16:38:55,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:38:55,103 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-14 16:38:55,104 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-14 16:38:55,104 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657526812] [2022-02-14 16:38:55,104 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [657526812] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-14 16:38:55,104 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [129483107] [2022-02-14 16:38:55,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:38:55,104 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:38:55,104 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-14 16:38:55,105 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-14 16:38:55,110 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-02-14 16:38:55,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:38:55,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 31 conjunts are in the unsatisfiable core [2022-02-14 16:38:55,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-14 16:38:55,657 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-14 16:38:55,657 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-14 16:38:55,872 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-02-14 16:38:55,872 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [129483107] provided 1 perfect and 1 imperfect interpolant sequences [2022-02-14 16:38:55,872 INFO L191 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-02-14 16:38:55,873 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 9] total 14 [2022-02-14 16:38:55,873 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [457249797] [2022-02-14 16:38:55,873 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-14 16:38:55,873 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-14 16:38:55,873 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-14 16:38:55,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-14 16:38:55,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2022-02-14 16:38:55,874 INFO L87 Difference]: Start difference. First operand 85 states and 117 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:38:57,909 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 [] [2022-02-14 16:39:00,092 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:39:02,208 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:39:04,376 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:39:06,492 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:39:08,659 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:39:10,825 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:39:12,996 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:39:15,120 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:39:17,354 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:39:19,469 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:39:21,572 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:39:21,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-14 16:39:21,693 INFO L93 Difference]: Finished difference Result 116 states and 163 transitions. [2022-02-14 16:39:21,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-14 16:39:21,694 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 29 [2022-02-14 16:39:21,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-14 16:39:21,694 INFO L225 Difference]: With dead ends: 116 [2022-02-14 16:39:21,694 INFO L226 Difference]: Without dead ends: 114 [2022-02-14 16:39:21,695 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 51 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2022-02-14 16:39:21,695 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 5 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 3 mSolverCounterUnsat, 12 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 24.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 12 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 25.8s IncrementalHoareTripleChecker+Time [2022-02-14 16:39:21,696 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 56 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 78 Invalid, 12 Unknown, 0 Unchecked, 25.8s Time] [2022-02-14 16:39:21,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2022-02-14 16:39:21,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 114. [2022-02-14 16:39:21,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 94 states have (on average 1.5106382978723405) internal successors, (142), 94 states have internal predecessors, (142), 10 states have call successors, (10), 10 states have call predecessors, (10), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-02-14 16:39:21,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 161 transitions. [2022-02-14 16:39:21,709 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 161 transitions. Word has length 29 [2022-02-14 16:39:21,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-14 16:39:21,709 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 161 transitions. [2022-02-14 16:39:21,709 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:39:21,709 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 161 transitions. [2022-02-14 16:39:21,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-02-14 16:39:21,710 INFO L506 BasicCegarLoop]: Found error trace [2022-02-14 16:39:21,710 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-14 16:39:21,729 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-02-14 16:39:21,923 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-02-14 16:39:21,923 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-14 16:39:21,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-14 16:39:21,924 INFO L85 PathProgramCache]: Analyzing trace with hash 630645509, now seen corresponding path program 1 times [2022-02-14 16:39:21,924 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-14 16:39:21,924 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2003848557] [2022-02-14 16:39:21,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:39:21,924 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-14 16:39:21,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:39:22,170 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-14 16:39:22,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:39:22,198 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-02-14 16:39:22,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:39:22,204 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-02-14 16:39:22,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:39:22,209 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-02-14 16:39:22,209 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-14 16:39:22,209 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2003848557] [2022-02-14 16:39:22,209 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2003848557] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-14 16:39:22,209 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [106835204] [2022-02-14 16:39:22,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:39:22,209 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:39:22,209 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-14 16:39:22,212 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-14 16:39:22,215 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-02-14 16:39:22,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:39:22,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 35 conjunts are in the unsatisfiable core [2022-02-14 16:39:22,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-14 16:39:22,931 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-02-14 16:39:22,931 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-14 16:39:23,243 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-02-14 16:39:23,243 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [106835204] provided 1 perfect and 1 imperfect interpolant sequences [2022-02-14 16:39:23,244 INFO L191 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-02-14 16:39:23,244 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10, 11] total 21 [2022-02-14 16:39:23,244 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631404255] [2022-02-14 16:39:23,244 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-14 16:39:23,244 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-14 16:39:23,244 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-14 16:39:23,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-14 16:39:23,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=365, Unknown=0, NotChecked=0, Total=420 [2022-02-14 16:39:23,245 INFO L87 Difference]: Start difference. First operand 114 states and 161 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:39:25,283 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 [] [2022-02-14 16:39:27,628 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:39:29,803 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:39:31,968 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:39:34,919 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.95s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:39:37,069 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:39:39,186 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:39:41,350 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:39:43,550 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:39:43,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-14 16:39:43,675 INFO L93 Difference]: Finished difference Result 127 states and 178 transitions. [2022-02-14 16:39:43,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-14 16:39:43,675 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 35 [2022-02-14 16:39:43,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-14 16:39:43,676 INFO L225 Difference]: With dead ends: 127 [2022-02-14 16:39:43,676 INFO L226 Difference]: Without dead ends: 125 [2022-02-14 16:39:43,677 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 61 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2022-02-14 16:39:43,677 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 5 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 1 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 20.4s IncrementalHoareTripleChecker+Time [2022-02-14 16:39:43,677 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 80 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 61 Invalid, 9 Unknown, 0 Unchecked, 20.4s Time] [2022-02-14 16:39:43,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2022-02-14 16:39:43,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 104. [2022-02-14 16:39:43,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 86 states have (on average 1.5232558139534884) internal successors, (131), 86 states have internal predecessors, (131), 9 states have call successors, (9), 9 states have call predecessors, (9), 8 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-02-14 16:39:43,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 148 transitions. [2022-02-14 16:39:43,688 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 148 transitions. Word has length 35 [2022-02-14 16:39:43,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-14 16:39:43,688 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 148 transitions. [2022-02-14 16:39:43,688 INFO L471 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:39:43,688 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 148 transitions. [2022-02-14 16:39:43,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-02-14 16:39:43,689 INFO L506 BasicCegarLoop]: Found error trace [2022-02-14 16:39:43,689 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-14 16:39:43,709 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-02-14 16:39:43,899 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:39:43,899 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-14 16:39:43,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-14 16:39:43,900 INFO L85 PathProgramCache]: Analyzing trace with hash -714688353, now seen corresponding path program 1 times [2022-02-14 16:39:43,900 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-14 16:39:43,900 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [208712330] [2022-02-14 16:39:43,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:39:43,900 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-14 16:39:43,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:39:44,117 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-14 16:39:44,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:39:44,140 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-02-14 16:39:44,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:39:44,146 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-02-14 16:39:44,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:39:44,148 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 14 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-02-14 16:39:44,148 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-14 16:39:44,149 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [208712330] [2022-02-14 16:39:44,149 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [208712330] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-14 16:39:44,149 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1662347489] [2022-02-14 16:39:44,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:39:44,149 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:39:44,149 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-14 16:39:44,150 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-14 16:39:44,152 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-02-14 16:39:44,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:39:44,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 35 conjunts are in the unsatisfiable core [2022-02-14 16:39:44,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-14 16:39:44,975 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-02-14 16:39:44,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-14 16:39:45,243 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-02-14 16:39:45,243 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1662347489] provided 1 perfect and 1 imperfect interpolant sequences [2022-02-14 16:39:45,243 INFO L191 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-02-14 16:39:45,243 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 11] total 20 [2022-02-14 16:39:45,243 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [193194481] [2022-02-14 16:39:45,244 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-14 16:39:45,244 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-14 16:39:45,244 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-14 16:39:45,244 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-14 16:39:45,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2022-02-14 16:39:45,245 INFO L87 Difference]: Start difference. First operand 104 states and 148 transitions. Second operand has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:39:47,276 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:39:49,476 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:39:51,643 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:39:53,755 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:39:55,872 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:39:58,037 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:40:00,218 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:40:02,383 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:40:04,563 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 [] [2022-02-14 16:40:04,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-14 16:40:04,675 INFO L93 Difference]: Finished difference Result 129 states and 182 transitions. [2022-02-14 16:40:04,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-14 16:40:04,675 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 36 [2022-02-14 16:40:04,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-14 16:40:04,676 INFO L225 Difference]: With dead ends: 129 [2022-02-14 16:40:04,676 INFO L226 Difference]: Without dead ends: 127 [2022-02-14 16:40:04,677 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 63 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2022-02-14 16:40:04,677 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 5 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 1 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.4s IncrementalHoareTripleChecker+Time [2022-02-14 16:40:04,678 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 75 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 64 Invalid, 9 Unknown, 0 Unchecked, 19.4s Time] [2022-02-14 16:40:04,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2022-02-14 16:40:04,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 115. [2022-02-14 16:40:04,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 95 states have (on average 1.5157894736842106) internal successors, (144), 95 states have internal predecessors, (144), 10 states have call successors, (10), 10 states have call predecessors, (10), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-02-14 16:40:04,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 163 transitions. [2022-02-14 16:40:04,692 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 163 transitions. Word has length 36 [2022-02-14 16:40:04,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-14 16:40:04,692 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 163 transitions. [2022-02-14 16:40:04,692 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:40:04,692 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 163 transitions. [2022-02-14 16:40:04,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-02-14 16:40:04,701 INFO L506 BasicCegarLoop]: Found error trace [2022-02-14 16:40:04,701 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-14 16:40:04,717 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-02-14 16:40:04,907 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-02-14 16:40:04,907 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-14 16:40:04,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-14 16:40:04,908 INFO L85 PathProgramCache]: Analyzing trace with hash 672780640, now seen corresponding path program 1 times [2022-02-14 16:40:04,908 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-14 16:40:04,908 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1912045919] [2022-02-14 16:40:04,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:40:04,908 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-14 16:40:04,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:40:04,969 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-14 16:40:04,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:40:04,973 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-02-14 16:40:04,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:40:04,979 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-02-14 16:40:04,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:40:04,982 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-02-14 16:40:04,983 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-14 16:40:04,983 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1912045919] [2022-02-14 16:40:04,983 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1912045919] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-14 16:40:04,983 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [201725561] [2022-02-14 16:40:04,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:40:04,983 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:40:04,983 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-14 16:40:04,984 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-14 16:40:04,995 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-02-14 16:40:05,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:40:05,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 35 conjunts are in the unsatisfiable core [2022-02-14 16:40:05,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-14 16:40:05,717 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-02-14 16:40:05,717 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-14 16:40:05,923 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-02-14 16:40:05,923 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [201725561] provided 1 perfect and 1 imperfect interpolant sequences [2022-02-14 16:40:05,923 INFO L191 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-02-14 16:40:05,923 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 11] total 17 [2022-02-14 16:40:05,923 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276316718] [2022-02-14 16:40:05,923 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-14 16:40:05,924 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-14 16:40:05,924 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-14 16:40:05,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-14 16:40:05,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2022-02-14 16:40:05,924 INFO L87 Difference]: Start difference. First operand 115 states and 163 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:40:07,952 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 [] [2022-02-14 16:40:10,140 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:40:12,305 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:40:14,408 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:40:16,524 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:40:18,691 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:40:20,855 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:40:22,960 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:40:25,087 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:40:27,190 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:40:29,306 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:40:29,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-14 16:40:29,497 INFO L93 Difference]: Finished difference Result 132 states and 188 transitions. [2022-02-14 16:40:29,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-14 16:40:29,498 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 37 [2022-02-14 16:40:29,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-14 16:40:29,499 INFO L225 Difference]: With dead ends: 132 [2022-02-14 16:40:29,499 INFO L226 Difference]: Without dead ends: 130 [2022-02-14 16:40:29,499 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 66 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2022-02-14 16:40:29,500 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 6 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 1 mSolverCounterUnsat, 11 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 22.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 11 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.6s IncrementalHoareTripleChecker+Time [2022-02-14 16:40:29,500 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 62 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 69 Invalid, 11 Unknown, 0 Unchecked, 23.6s Time] [2022-02-14 16:40:29,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2022-02-14 16:40:29,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2022-02-14 16:40:29,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 107 states have (on average 1.5233644859813085) internal successors, (163), 107 states have internal predecessors, (163), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-02-14 16:40:29,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 184 transitions. [2022-02-14 16:40:29,510 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 184 transitions. Word has length 37 [2022-02-14 16:40:29,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-14 16:40:29,511 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 184 transitions. [2022-02-14 16:40:29,511 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:40:29,511 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 184 transitions. [2022-02-14 16:40:29,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-02-14 16:40:29,511 INFO L506 BasicCegarLoop]: Found error trace [2022-02-14 16:40:29,512 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-14 16:40:29,535 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-02-14 16:40:29,734 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-02-14 16:40:29,734 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-14 16:40:29,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-14 16:40:29,735 INFO L85 PathProgramCache]: Analyzing trace with hash -1471641970, now seen corresponding path program 1 times [2022-02-14 16:40:29,735 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-14 16:40:29,735 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [264547113] [2022-02-14 16:40:29,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:40:29,735 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-14 16:40:29,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:40:29,936 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-14 16:40:29,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:40:29,955 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-02-14 16:40:29,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:40:29,972 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-02-14 16:40:29,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:40:29,976 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-02-14 16:40:29,976 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-14 16:40:29,976 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [264547113] [2022-02-14 16:40:29,976 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [264547113] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-14 16:40:29,976 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [60812645] [2022-02-14 16:40:29,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:40:29,976 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:40:29,977 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-14 16:40:29,980 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-14 16:40:29,984 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-02-14 16:40:30,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:40:30,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 35 conjunts are in the unsatisfiable core [2022-02-14 16:40:30,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-14 16:40:30,764 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-02-14 16:40:30,764 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-14 16:40:31,048 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-02-14 16:40:31,048 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [60812645] provided 1 perfect and 1 imperfect interpolant sequences [2022-02-14 16:40:31,048 INFO L191 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-02-14 16:40:31,048 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 11] total 20 [2022-02-14 16:40:31,048 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1734796092] [2022-02-14 16:40:31,048 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-14 16:40:31,049 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-14 16:40:31,049 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-14 16:40:31,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-14 16:40:31,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2022-02-14 16:40:31,049 INFO L87 Difference]: Start difference. First operand 129 states and 184 transitions. Second operand has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:40:33,094 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:40:35,269 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:40:37,390 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:40:39,573 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:40:41,737 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:40:43,911 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:40:46,068 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:40:48,246 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:40:50,366 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 [] [2022-02-14 16:40:50,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-14 16:40:50,482 INFO L93 Difference]: Finished difference Result 166 states and 235 transitions. [2022-02-14 16:40:50,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-14 16:40:50,482 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 37 [2022-02-14 16:40:50,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-14 16:40:50,483 INFO L225 Difference]: With dead ends: 166 [2022-02-14 16:40:50,483 INFO L226 Difference]: Without dead ends: 164 [2022-02-14 16:40:50,484 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 65 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2022-02-14 16:40:50,484 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 5 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 1 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.4s IncrementalHoareTripleChecker+Time [2022-02-14 16:40:50,485 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 74 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 64 Invalid, 9 Unknown, 0 Unchecked, 19.4s Time] [2022-02-14 16:40:50,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2022-02-14 16:40:50,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 164. [2022-02-14 16:40:50,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 136 states have (on average 1.5147058823529411) internal successors, (206), 136 states have internal predecessors, (206), 14 states have call successors, (14), 14 states have call predecessors, (14), 13 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-02-14 16:40:50,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 233 transitions. [2022-02-14 16:40:50,499 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 233 transitions. Word has length 37 [2022-02-14 16:40:50,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-14 16:40:50,499 INFO L470 AbstractCegarLoop]: Abstraction has 164 states and 233 transitions. [2022-02-14 16:40:50,499 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:40:50,499 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 233 transitions. [2022-02-14 16:40:50,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-02-14 16:40:50,500 INFO L506 BasicCegarLoop]: Found error trace [2022-02-14 16:40:50,500 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-14 16:40:50,518 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-02-14 16:40:50,706 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-02-14 16:40:50,707 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-14 16:40:50,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-14 16:40:50,707 INFO L85 PathProgramCache]: Analyzing trace with hash 877792218, now seen corresponding path program 1 times [2022-02-14 16:40:50,707 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-14 16:40:50,707 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [311885253] [2022-02-14 16:40:50,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:40:50,707 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-14 16:40:50,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:40:50,892 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-14 16:40:50,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:40:50,917 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-02-14 16:40:50,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:40:50,925 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-02-14 16:40:50,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:40:50,928 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 14 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-02-14 16:40:50,928 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-14 16:40:50,928 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [311885253] [2022-02-14 16:40:50,928 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [311885253] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-14 16:40:50,928 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [908668176] [2022-02-14 16:40:50,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:40:50,928 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:40:50,928 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-14 16:40:50,929 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-14 16:40:50,930 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-02-14 16:40:50,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:40:50,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 35 conjunts are in the unsatisfiable core [2022-02-14 16:40:50,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-14 16:40:51,692 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-02-14 16:40:51,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-14 16:40:51,958 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-02-14 16:40:51,958 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [908668176] provided 1 perfect and 1 imperfect interpolant sequences [2022-02-14 16:40:51,958 INFO L191 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-02-14 16:40:51,958 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 11] total 20 [2022-02-14 16:40:51,958 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712296140] [2022-02-14 16:40:51,958 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-14 16:40:51,959 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-14 16:40:51,959 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-14 16:40:51,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-14 16:40:51,959 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2022-02-14 16:40:51,959 INFO L87 Difference]: Start difference. First operand 164 states and 233 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:40:53,990 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 [] [2022-02-14 16:40:56,239 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:40:58,413 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:00,525 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:02,692 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:04,862 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:06,997 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:09,169 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:11,292 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:11,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-14 16:41:11,418 INFO L93 Difference]: Finished difference Result 180 states and 256 transitions. [2022-02-14 16:41:11,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-14 16:41:11,418 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 38 [2022-02-14 16:41:11,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-14 16:41:11,419 INFO L225 Difference]: With dead ends: 180 [2022-02-14 16:41:11,419 INFO L226 Difference]: Without dead ends: 178 [2022-02-14 16:41:11,420 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 67 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2022-02-14 16:41:11,420 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 5 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 2 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.4s IncrementalHoareTripleChecker+Time [2022-02-14 16:41:11,420 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 62 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 73 Invalid, 9 Unknown, 0 Unchecked, 19.4s Time] [2022-02-14 16:41:11,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2022-02-14 16:41:11,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 151. [2022-02-14 16:41:11,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 125 states have (on average 1.512) internal successors, (189), 125 states have internal predecessors, (189), 13 states have call successors, (13), 13 states have call predecessors, (13), 12 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-02-14 16:41:11,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 214 transitions. [2022-02-14 16:41:11,432 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 214 transitions. Word has length 38 [2022-02-14 16:41:11,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-14 16:41:11,433 INFO L470 AbstractCegarLoop]: Abstraction has 151 states and 214 transitions. [2022-02-14 16:41:11,433 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:41:11,433 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 214 transitions. [2022-02-14 16:41:11,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-02-14 16:41:11,433 INFO L506 BasicCegarLoop]: Found error trace [2022-02-14 16:41:11,434 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-14 16:41:11,453 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-02-14 16:41:11,647 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-02-14 16:41:11,647 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-14 16:41:11,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-14 16:41:11,648 INFO L85 PathProgramCache]: Analyzing trace with hash -1317945007, now seen corresponding path program 1 times [2022-02-14 16:41:11,648 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-14 16:41:11,648 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723784537] [2022-02-14 16:41:11,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:41:11,648 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-14 16:41:11,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:41:11,710 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-14 16:41:11,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:41:11,713 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-02-14 16:41:11,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:41:11,716 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-02-14 16:41:11,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:41:11,720 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-02-14 16:41:11,720 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-14 16:41:11,720 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723784537] [2022-02-14 16:41:11,720 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [723784537] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-14 16:41:11,720 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [506666857] [2022-02-14 16:41:11,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:41:11,720 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:41:11,721 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-14 16:41:11,722 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-14 16:41:11,723 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-02-14 16:41:11,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:41:11,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 35 conjunts are in the unsatisfiable core [2022-02-14 16:41:11,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-14 16:41:12,400 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-02-14 16:41:12,400 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-14 16:41:12,611 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-02-14 16:41:12,611 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [506666857] provided 1 perfect and 1 imperfect interpolant sequences [2022-02-14 16:41:12,611 INFO L191 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-02-14 16:41:12,611 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 11] total 17 [2022-02-14 16:41:12,611 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883468742] [2022-02-14 16:41:12,611 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-14 16:41:12,611 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-14 16:41:12,612 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-14 16:41:12,612 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-14 16:41:12,612 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2022-02-14 16:41:12,612 INFO L87 Difference]: Start difference. First operand 151 states and 214 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:41:14,646 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:16,837 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:18,954 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:21,125 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:23,295 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:25,456 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:27,577 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:29,700 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:29,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-14 16:41:29,896 INFO L93 Difference]: Finished difference Result 168 states and 239 transitions. [2022-02-14 16:41:29,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-14 16:41:29,896 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 38 [2022-02-14 16:41:29,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-14 16:41:29,897 INFO L225 Difference]: With dead ends: 168 [2022-02-14 16:41:29,897 INFO L226 Difference]: Without dead ends: 166 [2022-02-14 16:41:29,898 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 68 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2022-02-14 16:41:29,898 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 6 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 1 mSolverCounterUnsat, 8 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 8 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.3s IncrementalHoareTripleChecker+Time [2022-02-14 16:41:29,898 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 62 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 75 Invalid, 8 Unknown, 0 Unchecked, 17.3s Time] [2022-02-14 16:41:29,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2022-02-14 16:41:29,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 165. [2022-02-14 16:41:29,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 137 states have (on average 1.5182481751824817) internal successors, (208), 137 states have internal predecessors, (208), 14 states have call successors, (14), 14 states have call predecessors, (14), 13 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-02-14 16:41:29,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 235 transitions. [2022-02-14 16:41:29,932 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 235 transitions. Word has length 38 [2022-02-14 16:41:29,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-14 16:41:29,932 INFO L470 AbstractCegarLoop]: Abstraction has 165 states and 235 transitions. [2022-02-14 16:41:29,932 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:41:29,932 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 235 transitions. [2022-02-14 16:41:29,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-02-14 16:41:29,933 INFO L506 BasicCegarLoop]: Found error trace [2022-02-14 16:41:29,933 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-14 16:41:29,951 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-02-14 16:41:30,143 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:41:30,144 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-14 16:41:30,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-14 16:41:30,144 INFO L85 PathProgramCache]: Analyzing trace with hash -1213637701, now seen corresponding path program 1 times [2022-02-14 16:41:30,144 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-14 16:41:30,144 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1948861625] [2022-02-14 16:41:30,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:41:30,144 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-14 16:41:30,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:41:30,368 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-14 16:41:30,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:41:30,388 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-02-14 16:41:30,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:41:30,393 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-02-14 16:41:30,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:41:30,395 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 14 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-02-14 16:41:30,395 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-14 16:41:30,395 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1948861625] [2022-02-14 16:41:30,395 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1948861625] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-14 16:41:30,395 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1240777057] [2022-02-14 16:41:30,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:41:30,396 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:41:30,396 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-14 16:41:30,397 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-14 16:41:30,398 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-02-14 16:41:30,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:41:30,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 35 conjunts are in the unsatisfiable core [2022-02-14 16:41:30,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-14 16:41:31,184 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-02-14 16:41:31,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-14 16:41:31,496 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-02-14 16:41:31,496 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1240777057] provided 1 perfect and 1 imperfect interpolant sequences [2022-02-14 16:41:31,496 INFO L191 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-02-14 16:41:31,497 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 11] total 20 [2022-02-14 16:41:31,497 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981521967] [2022-02-14 16:41:31,497 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-14 16:41:31,497 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-14 16:41:31,497 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-14 16:41:31,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-14 16:41:31,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2022-02-14 16:41:31,498 INFO L87 Difference]: Start difference. First operand 165 states and 235 transitions. Second operand has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:41:33,535 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:35,717 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:37,884 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:39,992 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:42,161 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:44,326 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:46,454 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:48,581 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:50,798 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:52,911 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:53,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-14 16:41:53,035 INFO L93 Difference]: Finished difference Result 196 states and 281 transitions. [2022-02-14 16:41:53,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-14 16:41:53,035 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 39 [2022-02-14 16:41:53,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-14 16:41:53,036 INFO L225 Difference]: With dead ends: 196 [2022-02-14 16:41:53,036 INFO L226 Difference]: Without dead ends: 194 [2022-02-14 16:41:53,037 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 69 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2022-02-14 16:41:53,037 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 5 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 3 mSolverCounterUnsat, 10 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 10 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.5s IncrementalHoareTripleChecker+Time [2022-02-14 16:41:53,037 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 56 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 79 Invalid, 10 Unknown, 0 Unchecked, 21.5s Time] [2022-02-14 16:41:53,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2022-02-14 16:41:53,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 178. [2022-02-14 16:41:53,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 148 states have (on average 1.5202702702702702) internal successors, (225), 148 states have internal predecessors, (225), 15 states have call successors, (15), 15 states have call predecessors, (15), 14 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2022-02-14 16:41:53,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 254 transitions. [2022-02-14 16:41:53,065 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 254 transitions. Word has length 39 [2022-02-14 16:41:53,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-14 16:41:53,065 INFO L470 AbstractCegarLoop]: Abstraction has 178 states and 254 transitions. [2022-02-14 16:41:53,065 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:41:53,065 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 254 transitions. [2022-02-14 16:41:53,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-02-14 16:41:53,066 INFO L506 BasicCegarLoop]: Found error trace [2022-02-14 16:41:53,066 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-14 16:41:53,085 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-02-14 16:41:53,275 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-02-14 16:41:53,275 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-14 16:41:53,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-14 16:41:53,276 INFO L85 PathProgramCache]: Analyzing trace with hash -705160695, now seen corresponding path program 1 times [2022-02-14 16:41:53,276 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-14 16:41:53,276 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2041764529] [2022-02-14 16:41:53,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:41:53,276 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-14 16:41:53,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:41:53,467 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-14 16:41:53,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:41:53,489 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-02-14 16:41:53,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:41:53,494 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-02-14 16:41:53,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:41:53,497 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-02-14 16:41:53,497 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-14 16:41:53,497 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2041764529] [2022-02-14 16:41:53,497 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2041764529] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-14 16:41:53,497 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [327543562] [2022-02-14 16:41:53,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:41:53,497 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:41:53,497 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-14 16:41:53,498 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-14 16:41:53,503 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-02-14 16:41:53,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:41:53,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 35 conjunts are in the unsatisfiable core [2022-02-14 16:41:53,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-14 16:41:54,306 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-02-14 16:41:54,306 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-14 16:41:54,563 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-02-14 16:41:54,563 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [327543562] provided 1 perfect and 1 imperfect interpolant sequences [2022-02-14 16:41:54,563 INFO L191 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-02-14 16:41:54,563 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 11] total 20 [2022-02-14 16:41:54,564 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1013595694] [2022-02-14 16:41:54,564 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-14 16:41:54,564 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-14 16:41:54,564 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-14 16:41:54,564 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-14 16:41:54,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2022-02-14 16:41:54,565 INFO L87 Difference]: Start difference. First operand 178 states and 254 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:41:56,613 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:41:58,812 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:42:00,930 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:42:03,058 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:42:05,225 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:42:07,394 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:42:09,552 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:42:11,684 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:42:11,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-14 16:42:11,867 INFO L93 Difference]: Finished difference Result 209 states and 300 transitions. [2022-02-14 16:42:11,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-14 16:42:11,867 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 39 [2022-02-14 16:42:11,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-14 16:42:11,868 INFO L225 Difference]: With dead ends: 209 [2022-02-14 16:42:11,868 INFO L226 Difference]: Without dead ends: 207 [2022-02-14 16:42:11,868 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 69 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2022-02-14 16:42:11,869 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 5 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 2 mSolverCounterUnsat, 8 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 8 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.3s IncrementalHoareTripleChecker+Time [2022-02-14 16:42:11,869 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 62 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 72 Invalid, 8 Unknown, 0 Unchecked, 17.3s Time] [2022-02-14 16:42:11,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2022-02-14 16:42:11,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 194. [2022-02-14 16:42:11,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 162 states have (on average 1.5308641975308641) internal successors, (248), 162 states have internal predecessors, (248), 16 states have call successors, (16), 16 states have call predecessors, (16), 15 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-02-14 16:42:11,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 279 transitions. [2022-02-14 16:42:11,899 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 279 transitions. Word has length 39 [2022-02-14 16:42:11,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-14 16:42:11,899 INFO L470 AbstractCegarLoop]: Abstraction has 194 states and 279 transitions. [2022-02-14 16:42:11,899 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:42:11,899 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 279 transitions. [2022-02-14 16:42:11,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-02-14 16:42:11,900 INFO L506 BasicCegarLoop]: Found error trace [2022-02-14 16:42:11,900 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-14 16:42:11,918 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-02-14 16:42:12,111 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-02-14 16:42:12,111 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-14 16:42:12,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-14 16:42:12,112 INFO L85 PathProgramCache]: Analyzing trace with hash -2058534231, now seen corresponding path program 1 times [2022-02-14 16:42:12,112 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-14 16:42:12,112 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2144791445] [2022-02-14 16:42:12,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:42:12,112 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-14 16:42:12,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:42:12,166 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-14 16:42:12,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:42:12,169 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-02-14 16:42:12,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:42:12,173 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2022-02-14 16:42:12,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:42:12,175 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-02-14 16:42:12,175 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-14 16:42:12,175 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2144791445] [2022-02-14 16:42:12,175 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2144791445] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-14 16:42:12,175 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [857524598] [2022-02-14 16:42:12,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:42:12,176 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:42:12,176 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-14 16:42:12,177 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-14 16:42:12,178 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-02-14 16:42:12,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:42:12,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 35 conjunts are in the unsatisfiable core [2022-02-14 16:42:12,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-14 16:42:12,846 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-02-14 16:42:12,846 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-14 16:42:13,069 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-02-14 16:42:13,070 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [857524598] provided 1 perfect and 1 imperfect interpolant sequences [2022-02-14 16:42:13,070 INFO L191 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-02-14 16:42:13,070 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 11] total 16 [2022-02-14 16:42:13,070 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617750558] [2022-02-14 16:42:13,070 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-14 16:42:13,070 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-14 16:42:13,070 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-14 16:42:13,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-14 16:42:13,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2022-02-14 16:42:13,071 INFO L87 Difference]: Start difference. First operand 194 states and 279 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:42:15,098 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:42:17,301 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:42:19,405 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:42:21,566 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:42:23,685 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:42:25,846 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:42:28,025 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:42:30,137 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:42:32,320 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 [] [2022-02-14 16:42:32,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-14 16:42:32,451 INFO L93 Difference]: Finished difference Result 210 states and 302 transitions. [2022-02-14 16:42:32,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-14 16:42:32,451 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 39 [2022-02-14 16:42:32,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-14 16:42:32,452 INFO L225 Difference]: With dead ends: 210 [2022-02-14 16:42:32,452 INFO L226 Difference]: Without dead ends: 208 [2022-02-14 16:42:32,453 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 70 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2022-02-14 16:42:32,453 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 6 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 1 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.4s IncrementalHoareTripleChecker+Time [2022-02-14 16:42:32,453 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 62 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 74 Invalid, 9 Unknown, 0 Unchecked, 19.4s Time] [2022-02-14 16:42:32,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2022-02-14 16:42:32,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 207. [2022-02-14 16:42:32,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 173 states have (on average 1.5317919075144508) internal successors, (265), 173 states have internal predecessors, (265), 17 states have call successors, (17), 17 states have call predecessors, (17), 16 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2022-02-14 16:42:32,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 298 transitions. [2022-02-14 16:42:32,468 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 298 transitions. Word has length 39 [2022-02-14 16:42:32,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-14 16:42:32,468 INFO L470 AbstractCegarLoop]: Abstraction has 207 states and 298 transitions. [2022-02-14 16:42:32,469 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:42:32,469 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 298 transitions. [2022-02-14 16:42:32,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-02-14 16:42:32,469 INFO L506 BasicCegarLoop]: Found error trace [2022-02-14 16:42:32,470 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-14 16:42:32,490 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-02-14 16:42:32,687 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:42:32,688 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-14 16:42:32,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-14 16:42:32,688 INFO L85 PathProgramCache]: Analyzing trace with hash 1254429548, now seen corresponding path program 1 times [2022-02-14 16:42:32,688 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-14 16:42:32,688 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [986726356] [2022-02-14 16:42:32,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:42:32,688 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-14 16:42:32,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:42:32,886 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-14 16:42:32,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:42:32,906 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-02-14 16:42:32,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:42:32,917 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-02-14 16:42:32,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:42:32,919 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-02-14 16:42:32,919 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-14 16:42:32,919 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [986726356] [2022-02-14 16:42:32,920 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [986726356] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-14 16:42:32,920 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2085061831] [2022-02-14 16:42:32,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:42:32,920 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:42:32,920 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-14 16:42:32,924 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-14 16:42:32,928 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-02-14 16:42:32,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:42:32,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 35 conjunts are in the unsatisfiable core [2022-02-14 16:42:32,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-14 16:42:33,671 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-02-14 16:42:33,671 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-14 16:42:33,916 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-02-14 16:42:33,916 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2085061831] provided 1 perfect and 1 imperfect interpolant sequences [2022-02-14 16:42:33,916 INFO L191 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-02-14 16:42:33,916 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 11] total 20 [2022-02-14 16:42:33,916 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140084652] [2022-02-14 16:42:33,917 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-14 16:42:33,917 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-14 16:42:33,917 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-14 16:42:33,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-14 16:42:33,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2022-02-14 16:42:33,917 INFO L87 Difference]: Start difference. First operand 207 states and 298 transitions. Second operand has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:42:35,946 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 [] [2022-02-14 16:42:38,138 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:42:40,248 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:42:42,369 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:42:44,489 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:42:46,657 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:42:48,825 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:42:50,992 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:42:53,094 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:42:55,218 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:42:57,326 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:42:59,537 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 [] [2022-02-14 16:42:59,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-14 16:42:59,672 INFO L93 Difference]: Finished difference Result 253 states and 367 transitions. [2022-02-14 16:42:59,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-14 16:42:59,673 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2022-02-14 16:42:59,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-14 16:42:59,674 INFO L225 Difference]: With dead ends: 253 [2022-02-14 16:42:59,674 INFO L226 Difference]: Without dead ends: 251 [2022-02-14 16:42:59,674 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 71 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2022-02-14 16:42:59,675 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 5 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 3 mSolverCounterUnsat, 12 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 24.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 12 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 25.7s IncrementalHoareTripleChecker+Time [2022-02-14 16:42:59,675 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 59 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 77 Invalid, 12 Unknown, 0 Unchecked, 25.7s Time] [2022-02-14 16:42:59,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2022-02-14 16:42:59,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 251. [2022-02-14 16:42:59,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 211 states have (on average 1.5450236966824644) internal successors, (326), 211 states have internal predecessors, (326), 20 states have call successors, (20), 20 states have call predecessors, (20), 19 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2022-02-14 16:42:59,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 365 transitions. [2022-02-14 16:42:59,692 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 365 transitions. Word has length 40 [2022-02-14 16:42:59,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-14 16:42:59,692 INFO L470 AbstractCegarLoop]: Abstraction has 251 states and 365 transitions. [2022-02-14 16:42:59,692 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:42:59,693 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 365 transitions. [2022-02-14 16:42:59,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-02-14 16:42:59,693 INFO L506 BasicCegarLoop]: Found error trace [2022-02-14 16:42:59,693 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-14 16:42:59,712 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-02-14 16:42:59,903 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:42:59,904 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-14 16:42:59,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-14 16:42:59,904 INFO L85 PathProgramCache]: Analyzing trace with hash 2042592661, now seen corresponding path program 1 times [2022-02-14 16:42:59,904 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-14 16:42:59,904 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [685169124] [2022-02-14 16:42:59,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:42:59,904 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-14 16:42:59,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:43:00,010 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-14 16:43:00,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:43:00,013 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-02-14 16:43:00,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:43:00,017 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2022-02-14 16:43:00,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:43:00,021 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-02-14 16:43:00,021 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-14 16:43:00,021 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [685169124] [2022-02-14 16:43:00,021 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [685169124] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-14 16:43:00,021 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [900744283] [2022-02-14 16:43:00,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:43:00,021 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:43:00,021 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-14 16:43:00,024 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-14 16:43:00,049 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-02-14 16:43:00,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:43:00,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 35 conjunts are in the unsatisfiable core [2022-02-14 16:43:00,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-14 16:43:00,751 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-02-14 16:43:00,752 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-14 16:43:00,990 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-02-14 16:43:00,990 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [900744283] provided 1 perfect and 1 imperfect interpolant sequences [2022-02-14 16:43:00,990 INFO L191 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-02-14 16:43:00,990 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 11] total 17 [2022-02-14 16:43:00,990 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600711259] [2022-02-14 16:43:00,990 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-14 16:43:00,991 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-14 16:43:00,991 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-14 16:43:00,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-14 16:43:00,991 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2022-02-14 16:43:00,991 INFO L87 Difference]: Start difference. First operand 251 states and 365 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:43:03,033 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 [] [2022-02-14 16:43:05,227 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:43:07,332 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:43:09,496 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:43:11,613 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:43:13,777 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:43:15,976 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:43:18,151 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:43:20,266 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:43:20,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-14 16:43:20,403 INFO L93 Difference]: Finished difference Result 267 states and 388 transitions. [2022-02-14 16:43:20,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-14 16:43:20,404 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2022-02-14 16:43:20,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-14 16:43:20,404 INFO L225 Difference]: With dead ends: 267 [2022-02-14 16:43:20,404 INFO L226 Difference]: Without dead ends: 265 [2022-02-14 16:43:20,405 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 72 SyntacticMatches, 5 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2022-02-14 16:43:20,405 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 5 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 2 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.4s IncrementalHoareTripleChecker+Time [2022-02-14 16:43:20,405 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 62 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 73 Invalid, 9 Unknown, 0 Unchecked, 19.4s Time] [2022-02-14 16:43:20,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2022-02-14 16:43:20,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 252. [2022-02-14 16:43:20,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 212 states have (on average 1.5471698113207548) internal successors, (328), 212 states have internal predecessors, (328), 20 states have call successors, (20), 20 states have call predecessors, (20), 19 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2022-02-14 16:43:20,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 367 transitions. [2022-02-14 16:43:20,419 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 367 transitions. Word has length 40 [2022-02-14 16:43:20,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-14 16:43:20,419 INFO L470 AbstractCegarLoop]: Abstraction has 252 states and 367 transitions. [2022-02-14 16:43:20,419 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:43:20,419 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 367 transitions. [2022-02-14 16:43:20,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-02-14 16:43:20,420 INFO L506 BasicCegarLoop]: Found error trace [2022-02-14 16:43:20,420 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-14 16:43:20,438 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-02-14 16:43:20,625 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:43:20,626 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-14 16:43:20,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-14 16:43:20,626 INFO L85 PathProgramCache]: Analyzing trace with hash -361887036, now seen corresponding path program 1 times [2022-02-14 16:43:20,626 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-14 16:43:20,626 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1984642677] [2022-02-14 16:43:20,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:43:20,626 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-14 16:43:20,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:43:20,684 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-14 16:43:20,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:43:20,687 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-02-14 16:43:20,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:43:20,689 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2022-02-14 16:43:20,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:43:20,691 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-02-14 16:43:20,691 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-14 16:43:20,691 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1984642677] [2022-02-14 16:43:20,691 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1984642677] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-14 16:43:20,691 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1734209914] [2022-02-14 16:43:20,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:43:20,691 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:43:20,691 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-14 16:43:20,692 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-14 16:43:20,693 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-02-14 16:43:20,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:43:20,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 35 conjunts are in the unsatisfiable core [2022-02-14 16:43:20,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-14 16:43:21,413 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-02-14 16:43:21,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-14 16:43:21,661 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-02-14 16:43:21,661 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1734209914] provided 1 perfect and 1 imperfect interpolant sequences [2022-02-14 16:43:21,661 INFO L191 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-02-14 16:43:21,661 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 11] total 16 [2022-02-14 16:43:21,661 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446419928] [2022-02-14 16:43:21,662 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-14 16:43:21,662 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-14 16:43:21,662 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-14 16:43:21,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-14 16:43:21,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2022-02-14 16:43:21,662 INFO L87 Difference]: Start difference. First operand 252 states and 367 transitions. Second operand has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:43:23,690 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:43:25,869 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:43:27,979 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:43:30,150 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:43:32,261 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:43:34,376 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:43:36,488 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:43:38,651 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:43:40,828 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:43:42,945 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:43:43,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-14 16:43:43,171 INFO L93 Difference]: Finished difference Result 283 states and 413 transitions. [2022-02-14 16:43:43,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-14 16:43:43,172 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 41 [2022-02-14 16:43:43,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-14 16:43:43,173 INFO L225 Difference]: With dead ends: 283 [2022-02-14 16:43:43,173 INFO L226 Difference]: Without dead ends: 281 [2022-02-14 16:43:43,174 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 74 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2022-02-14 16:43:43,174 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 5 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 3 mSolverCounterUnsat, 10 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 10 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.5s IncrementalHoareTripleChecker+Time [2022-02-14 16:43:43,174 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 56 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 76 Invalid, 10 Unknown, 0 Unchecked, 21.5s Time] [2022-02-14 16:43:43,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2022-02-14 16:43:43,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 281. [2022-02-14 16:43:43,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 281 states, 237 states have (on average 1.5527426160337552) internal successors, (368), 237 states have internal predecessors, (368), 22 states have call successors, (22), 22 states have call predecessors, (22), 21 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2022-02-14 16:43:43,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 281 states to 281 states and 411 transitions. [2022-02-14 16:43:43,192 INFO L78 Accepts]: Start accepts. Automaton has 281 states and 411 transitions. Word has length 41 [2022-02-14 16:43:43,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-14 16:43:43,192 INFO L470 AbstractCegarLoop]: Abstraction has 281 states and 411 transitions. [2022-02-14 16:43:43,192 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:43:43,192 INFO L276 IsEmpty]: Start isEmpty. Operand 281 states and 411 transitions. [2022-02-14 16:43:43,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-02-14 16:43:43,193 INFO L506 BasicCegarLoop]: Found error trace [2022-02-14 16:43:43,193 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-14 16:43:43,221 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-02-14 16:43:43,415 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-02-14 16:43:43,415 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-14 16:43:43,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-14 16:43:43,416 INFO L85 PathProgramCache]: Analyzing trace with hash -304485627, now seen corresponding path program 1 times [2022-02-14 16:43:43,416 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-14 16:43:43,416 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1040561271] [2022-02-14 16:43:43,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:43:43,416 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-14 16:43:43,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:43:43,494 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-14 16:43:43,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:43:43,497 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-02-14 16:43:43,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:43:43,503 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2022-02-14 16:43:43,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:43:43,507 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 18 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-02-14 16:43:43,507 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-14 16:43:43,507 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1040561271] [2022-02-14 16:43:43,507 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1040561271] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-14 16:43:43,507 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1739818235] [2022-02-14 16:43:43,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:43:43,507 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:43:43,507 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-14 16:43:43,509 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-14 16:43:43,545 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-02-14 16:43:43,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:43:43,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 35 conjunts are in the unsatisfiable core [2022-02-14 16:43:43,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-14 16:43:44,351 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 18 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-02-14 16:43:44,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-14 16:43:44,595 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-02-14 16:43:44,595 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1739818235] provided 1 perfect and 1 imperfect interpolant sequences [2022-02-14 16:43:44,595 INFO L191 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-02-14 16:43:44,595 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 11] total 17 [2022-02-14 16:43:44,595 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630702803] [2022-02-14 16:43:44,595 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-14 16:43:44,595 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-14 16:43:44,596 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-14 16:43:44,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-14 16:43:44,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2022-02-14 16:43:44,596 INFO L87 Difference]: Start difference. First operand 281 states and 411 transitions. Second operand has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:43:46,649 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:43:48,836 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:43:50,939 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:43:53,114 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:43:55,229 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:43:57,401 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:43:59,565 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:44:01,704 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-02-14 16:44:01,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-14 16:44:01,921 INFO L93 Difference]: Finished difference Result 298 states and 436 transitions. [2022-02-14 16:44:01,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-14 16:44:01,922 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2022-02-14 16:44:01,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-14 16:44:01,923 INFO L225 Difference]: With dead ends: 298 [2022-02-14 16:44:01,923 INFO L226 Difference]: Without dead ends: 296 [2022-02-14 16:44:01,924 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 77 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2022-02-14 16:44:01,928 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 5 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 3 mSolverCounterUnsat, 8 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 8 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.3s IncrementalHoareTripleChecker+Time [2022-02-14 16:44:01,928 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 56 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 78 Invalid, 8 Unknown, 0 Unchecked, 17.3s Time] [2022-02-14 16:44:01,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2022-02-14 16:44:01,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 296. [2022-02-14 16:44:01,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 296 states, 250 states have (on average 1.556) internal successors, (389), 250 states have internal predecessors, (389), 23 states have call successors, (23), 23 states have call predecessors, (23), 22 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2022-02-14 16:44:01,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 434 transitions. [2022-02-14 16:44:01,951 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 434 transitions. Word has length 43 [2022-02-14 16:44:01,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-14 16:44:01,951 INFO L470 AbstractCegarLoop]: Abstraction has 296 states and 434 transitions. [2022-02-14 16:44:01,951 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-14 16:44:01,951 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 434 transitions. [2022-02-14 16:44:01,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-02-14 16:44:01,952 INFO L506 BasicCegarLoop]: Found error trace [2022-02-14 16:44:01,952 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-14 16:44:01,968 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-02-14 16:44:02,155 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-02-14 16:44:02,156 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-14 16:44:02,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-14 16:44:02,156 INFO L85 PathProgramCache]: Analyzing trace with hash -531923689, now seen corresponding path program 1 times [2022-02-14 16:44:02,156 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-14 16:44:02,156 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [216471517] [2022-02-14 16:44:02,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:44:02,156 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-14 16:44:02,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:44:02,345 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-14 16:44:02,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:44:02,370 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-02-14 16:44:02,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:44:02,375 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-02-14 16:44:02,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:44:02,379 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2022-02-14 16:44:02,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-14 16:44:02,382 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 24 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-02-14 16:44:02,382 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-14 16:44:02,382 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [216471517] [2022-02-14 16:44:02,382 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [216471517] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-14 16:44:02,382 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1556425825] [2022-02-14 16:44:02,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-14 16:44:02,382 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-14 16:44:02,383 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-14 16:44:02,384 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-14 16:44:02,387 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process