/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-7968f31 [2022-03-18 00:15:57,968 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-18 00:15:57,970 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-18 00:15:57,993 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-18 00:15:58,033 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-18 00:15:58,033 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-18 00:15:58,034 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-18 00:15:58,035 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-18 00:15:58,048 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-18 00:15:58,049 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-18 00:15:58,051 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-18 00:15:58,051 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-18 00:15:58,051 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-18 00:15:58,051 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-18 00:15:58,051 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-18 00:15:58,051 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-18 00:15:58,051 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-18 00:15:58,052 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-18 00:15:58,052 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-18 00:15:58,052 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-18 00:15:58,052 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-18 00:15:58,052 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-18 00:15:58,052 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-18 00:15:58,052 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 00:15:58,052 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-18 00:15:58,052 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-18 00:15:58,053 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-18 00:15:58,053 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-18 00:15:58,053 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-18 00:15:58,053 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-18 00:15:58,053 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-18 00:15:58,232 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-18 00:15:58,247 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-18 00:15:58,248 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-18 00:15:58,249 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-18 00:15:58,250 INFO L275 PluginConnector]: CDTParser initialized [2022-03-18 00:15:58,251 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_1-1.c [2022-03-18 00:15:58,313 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/23ec5faa6/522e7e7be18049c68d533b21b1091f7b/FLAGd7a3639eb [2022-03-18 00:15:58,636 INFO L306 CDTParser]: Found 1 translation units. [2022-03-18 00:15:58,636 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_1-1.c [2022-03-18 00:15:58,641 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/23ec5faa6/522e7e7be18049c68d533b21b1091f7b/FLAGd7a3639eb [2022-03-18 00:15:59,078 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/23ec5faa6/522e7e7be18049c68d533b21b1091f7b [2022-03-18 00:15:59,080 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-18 00:15:59,081 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-18 00:15:59,084 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-18 00:15:59,084 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-18 00:15:59,086 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-18 00:15:59,086 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 12:15:59" (1/1) ... [2022-03-18 00:15:59,087 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@9eacb52 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:15:59, skipping insertion in model container [2022-03-18 00:15:59,087 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 12:15:59" (1/1) ... [2022-03-18 00:15:59,092 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-18 00:15:59,101 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-18 00:15:59,238 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_1-1.c[322,335] [2022-03-18 00:15:59,245 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 00:15:59,254 INFO L203 MainTranslator]: Completed pre-run [2022-03-18 00:15:59,263 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_1-1.c[322,335] [2022-03-18 00:15:59,272 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 00:15:59,281 INFO L208 MainTranslator]: Completed translation [2022-03-18 00:15:59,281 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:15:59 WrapperNode [2022-03-18 00:15:59,281 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-18 00:15:59,283 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-18 00:15:59,283 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-18 00:15:59,283 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-18 00:15:59,292 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:15:59" (1/1) ... [2022-03-18 00:15:59,292 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:15:59" (1/1) ... [2022-03-18 00:15:59,298 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:15:59" (1/1) ... [2022-03-18 00:15:59,298 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:15:59" (1/1) ... [2022-03-18 00:15:59,302 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:15:59" (1/1) ... [2022-03-18 00:15:59,305 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:15:59" (1/1) ... [2022-03-18 00:15:59,310 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:15:59" (1/1) ... [2022-03-18 00:15:59,312 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-18 00:15:59,313 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-18 00:15:59,313 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-18 00:15:59,313 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-18 00:15:59,313 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:15:59" (1/1) ... [2022-03-18 00:15:59,319 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 00:15:59,326 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:15:59,337 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-18 00:15:59,351 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-18 00:15:59,367 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-18 00:15:59,367 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-18 00:15:59,368 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-18 00:15:59,368 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-18 00:15:59,368 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-18 00:15:59,368 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-18 00:15:59,368 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-18 00:15:59,368 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-18 00:15:59,368 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-18 00:15:59,368 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-18 00:15:59,368 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-18 00:15:59,369 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-18 00:15:59,369 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-18 00:15:59,369 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-18 00:15:59,369 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-18 00:15:59,369 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-18 00:15:59,369 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-18 00:15:59,408 INFO L234 CfgBuilder]: Building ICFG [2022-03-18 00:15:59,409 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-18 00:15:59,512 INFO L275 CfgBuilder]: Performing block encoding [2022-03-18 00:15:59,516 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-18 00:15:59,516 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-18 00:15:59,517 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 12:15:59 BoogieIcfgContainer [2022-03-18 00:15:59,517 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-18 00:15:59,518 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-18 00:15:59,518 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-18 00:15:59,523 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-18 00:15:59,523 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.03 12:15:59" (1/3) ... [2022-03-18 00:15:59,524 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24244b01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 12:15:59, skipping insertion in model container [2022-03-18 00:15:59,524 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:15:59" (2/3) ... [2022-03-18 00:15:59,524 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24244b01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 12:15:59, skipping insertion in model container [2022-03-18 00:15:59,524 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 12:15:59" (3/3) ... [2022-03-18 00:15:59,525 INFO L111 eAbstractionObserver]: Analyzing ICFG simple_1-1.c [2022-03-18 00:15:59,528 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-18 00:15:59,529 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-18 00:15:59,565 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-18 00:15:59,573 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-18 00:15:59,573 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-18 00:15:59,584 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 00:15:59,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-03-18 00:15:59,593 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:15:59,594 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:15:59,595 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:15:59,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:15:59,599 INFO L85 PathProgramCache]: Analyzing trace with hash -219174432, now seen corresponding path program 1 times [2022-03-18 00:15:59,605 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:15:59,605 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [140884874] [2022-03-18 00:15:59,613 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 00:15:59,613 INFO L85 PathProgramCache]: Analyzing trace with hash -219174432, now seen corresponding path program 2 times [2022-03-18 00:15:59,615 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:15:59,615 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1973424359] [2022-03-18 00:15:59,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:15:59,616 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:15:59,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:15:59,757 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:15:59,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:15:59,765 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:15:59,765 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:15:59,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1973424359] [2022-03-18 00:15:59,766 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1973424359] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:15:59,766 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:15:59,766 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 00:15:59,768 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:15:59,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [140884874] [2022-03-18 00:15:59,768 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [140884874] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:15:59,768 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:15:59,768 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 00:15:59,768 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886160042] [2022-03-18 00:15:59,769 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:15:59,771 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-18 00:15:59,772 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:15:59,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-18 00:15:59,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-18 00:15:59,789 INFO L87 Difference]: Start difference. First operand has 18 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:15:59,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:15:59,821 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2022-03-18 00:15:59,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-18 00:15:59,822 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-03-18 00:15:59,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:15:59,827 INFO L225 Difference]: With dead ends: 29 [2022-03-18 00:15:59,827 INFO L226 Difference]: Without dead ends: 12 [2022-03-18 00:15:59,829 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-18 00:15:59,831 INFO L912 BasicCegarLoop]: 17 mSDtfsCounter, 9 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 00:15:59,832 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 20 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 00:15:59,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2022-03-18 00:15:59,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2022-03-18 00:15:59,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:15:59,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2022-03-18 00:15:59,854 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 11 [2022-03-18 00:15:59,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:15:59,855 INFO L478 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2022-03-18 00:15:59,855 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:15:59,855 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2022-03-18 00:15:59,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-03-18 00:15:59,856 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:15:59,856 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:15:59,856 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-18 00:15:59,856 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:15:59,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:15:59,857 INFO L85 PathProgramCache]: Analyzing trace with hash -222868516, now seen corresponding path program 1 times [2022-03-18 00:15:59,857 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:15:59,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [45612837] [2022-03-18 00:15:59,857 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 00:15:59,857 INFO L85 PathProgramCache]: Analyzing trace with hash -222868516, now seen corresponding path program 2 times [2022-03-18 00:15:59,858 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:15:59,858 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [369057566] [2022-03-18 00:15:59,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:15:59,858 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:15:59,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:15:59,919 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:15:59,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:15:59,928 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:15:59,929 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:15:59,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [369057566] [2022-03-18 00:15:59,929 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [369057566] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:15:59,929 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:15:59,929 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-18 00:15:59,929 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:15:59,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [45612837] [2022-03-18 00:15:59,930 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [45612837] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:15:59,930 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:15:59,930 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-18 00:15:59,930 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [165026289] [2022-03-18 00:15:59,930 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:15:59,931 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-18 00:15:59,931 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:15:59,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-18 00:15:59,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-18 00:15:59,931 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:15:59,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:15:59,963 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2022-03-18 00:15:59,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-18 00:15:59,964 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-03-18 00:15:59,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:15:59,964 INFO L225 Difference]: With dead ends: 18 [2022-03-18 00:15:59,965 INFO L226 Difference]: Without dead ends: 13 [2022-03-18 00:15:59,965 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-03-18 00:15:59,967 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 00:15:59,968 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 18 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 00:15:59,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-03-18 00:15:59,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-03-18 00:15:59,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:15:59,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2022-03-18 00:15:59,973 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2022-03-18 00:15:59,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:15:59,974 INFO L478 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2022-03-18 00:15:59,974 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:15:59,974 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2022-03-18 00:15:59,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-03-18 00:15:59,974 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:15:59,974 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:15:59,974 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-18 00:15:59,975 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:15:59,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:15:59,975 INFO L85 PathProgramCache]: Analyzing trace with hash 1717471862, now seen corresponding path program 1 times [2022-03-18 00:15:59,975 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:15:59,975 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1380586870] [2022-03-18 00:16:00,055 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:00,056 INFO L85 PathProgramCache]: Analyzing trace with hash -1867307785, now seen corresponding path program 1 times [2022-03-18 00:16:00,056 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:00,058 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1419830613] [2022-03-18 00:16:00,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:00,058 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:00,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:00,098 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:00,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:00,133 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:00,134 INFO L85 PathProgramCache]: Analyzing trace with hash 1717471862, now seen corresponding path program 2 times [2022-03-18 00:16:00,134 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:00,134 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2095834918] [2022-03-18 00:16:00,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:00,134 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:00,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:00,206 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:00,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:00,212 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:00,212 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:00,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2095834918] [2022-03-18 00:16:00,212 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2095834918] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:00,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [106924544] [2022-03-18 00:16:00,212 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:16:00,213 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:00,213 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:00,214 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) [2022-03-18 00:16:00,243 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-18 00:16:00,258 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:16:00,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:00,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 5 conjunts are in the unsatisfiable core [2022-03-18 00:16:00,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:00,306 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:00,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:00,374 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:00,375 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [106924544] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:00,375 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:00,375 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 8 [2022-03-18 00:16:00,375 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:00,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1380586870] [2022-03-18 00:16:00,376 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1380586870] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:00,376 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:00,376 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 00:16:00,376 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041084915] [2022-03-18 00:16:00,376 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:00,376 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-18 00:16:00,376 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:00,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-18 00:16:00,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2022-03-18 00:16:00,377 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:00,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:00,424 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2022-03-18 00:16:00,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-18 00:16:00,424 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2022-03-18 00:16:00,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:00,425 INFO L225 Difference]: With dead ends: 19 [2022-03-18 00:16:00,425 INFO L226 Difference]: Without dead ends: 14 [2022-03-18 00:16:00,427 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2022-03-18 00:16:00,429 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:00,430 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 23 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 00:16:00,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-03-18 00:16:00,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-03-18 00:16:00,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 9 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:00,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2022-03-18 00:16:00,433 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2022-03-18 00:16:00,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:00,433 INFO L478 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2022-03-18 00:16:00,433 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:00,433 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2022-03-18 00:16:00,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-03-18 00:16:00,434 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:00,434 INFO L500 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:00,453 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-18 00:16:00,634 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:00,635 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:00,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:00,635 INFO L85 PathProgramCache]: Analyzing trace with hash 1738481436, now seen corresponding path program 3 times [2022-03-18 00:16:00,635 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:00,635 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1498437422] [2022-03-18 00:16:00,683 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:00,684 INFO L85 PathProgramCache]: Analyzing trace with hash -1808202441, now seen corresponding path program 1 times [2022-03-18 00:16:00,684 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:00,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2053806915] [2022-03-18 00:16:00,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:00,684 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:00,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:00,700 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:00,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:00,711 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:00,711 INFO L85 PathProgramCache]: Analyzing trace with hash 1738481436, now seen corresponding path program 4 times [2022-03-18 00:16:00,711 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:00,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [792811292] [2022-03-18 00:16:00,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:00,712 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:00,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:00,767 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:00,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:00,783 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:00,784 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:00,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [792811292] [2022-03-18 00:16:00,784 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [792811292] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:00,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1368454416] [2022-03-18 00:16:00,784 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:16:00,784 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:00,785 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:00,786 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) [2022-03-18 00:16:00,788 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-18 00:16:00,817 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:16:00,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:00,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-18 00:16:00,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:00,867 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:00,868 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:00,913 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:00,914 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1368454416] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:00,914 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:00,914 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 10 [2022-03-18 00:16:00,914 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:00,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1498437422] [2022-03-18 00:16:00,915 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1498437422] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:00,915 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:00,915 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 00:16:00,915 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [151035330] [2022-03-18 00:16:00,915 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:00,915 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 00:16:00,915 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:00,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 00:16:00,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2022-03-18 00:16:00,916 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:00,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:00,959 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2022-03-18 00:16:00,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 00:16:00,960 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 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 13 [2022-03-18 00:16:00,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:00,960 INFO L225 Difference]: With dead ends: 20 [2022-03-18 00:16:00,960 INFO L226 Difference]: Without dead ends: 15 [2022-03-18 00:16:00,961 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=57, Invalid=99, Unknown=0, NotChecked=0, Total=156 [2022-03-18 00:16:00,961 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:00,962 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 18 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 00:16:00,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-03-18 00:16:00,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-03-18 00:16:00,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.1) internal successors, (11), 10 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) [2022-03-18 00:16:00,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2022-03-18 00:16:00,965 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2022-03-18 00:16:00,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:00,965 INFO L478 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2022-03-18 00:16:00,965 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:00,965 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2022-03-18 00:16:00,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-03-18 00:16:00,965 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:00,965 INFO L500 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:00,984 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-18 00:16:01,181 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-03-18 00:16:01,182 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:01,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:01,183 INFO L85 PathProgramCache]: Analyzing trace with hash -1905189066, now seen corresponding path program 5 times [2022-03-18 00:16:01,183 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:01,183 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2028844874] [2022-03-18 00:16:01,214 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:01,214 INFO L85 PathProgramCache]: Analyzing trace with hash -1749097097, now seen corresponding path program 1 times [2022-03-18 00:16:01,214 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:01,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1450886532] [2022-03-18 00:16:01,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:01,215 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:01,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:01,226 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:01,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:01,235 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:01,235 INFO L85 PathProgramCache]: Analyzing trace with hash -1905189066, now seen corresponding path program 6 times [2022-03-18 00:16:01,235 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:01,235 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1831842905] [2022-03-18 00:16:01,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:01,236 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:01,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:01,313 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:01,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:01,319 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:01,319 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:01,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1831842905] [2022-03-18 00:16:01,320 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1831842905] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:01,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [265943549] [2022-03-18 00:16:01,320 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:16:01,320 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:01,320 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:01,329 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) [2022-03-18 00:16:01,330 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-18 00:16:01,355 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-18 00:16:01,356 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:01,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-18 00:16:01,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:01,403 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:01,404 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:01,548 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:01,548 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [265943549] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:01,548 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:01,548 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 9] total 15 [2022-03-18 00:16:01,549 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:01,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2028844874] [2022-03-18 00:16:01,549 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2028844874] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:01,549 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:01,549 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-18 00:16:01,549 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1352313073] [2022-03-18 00:16:01,549 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:01,549 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-18 00:16:01,549 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:01,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-18 00:16:01,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=155, Unknown=0, NotChecked=0, Total=210 [2022-03-18 00:16:01,550 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 7 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) [2022-03-18 00:16:01,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:01,630 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2022-03-18 00:16:01,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-18 00:16:01,631 INFO L78 Accepts]: Start accepts. Automaton has has 7 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 [2022-03-18 00:16:01,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:01,631 INFO L225 Difference]: With dead ends: 21 [2022-03-18 00:16:01,631 INFO L226 Difference]: Without dead ends: 16 [2022-03-18 00:16:01,631 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=93, Invalid=249, Unknown=0, NotChecked=0, Total=342 [2022-03-18 00:16:01,632 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:01,632 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 33 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 00:16:01,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-03-18 00:16:01,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-03-18 00:16:01,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 11 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:01,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2022-03-18 00:16:01,635 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2022-03-18 00:16:01,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:01,635 INFO L478 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2022-03-18 00:16:01,635 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 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) [2022-03-18 00:16:01,635 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2022-03-18 00:16:01,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-18 00:16:01,635 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:01,635 INFO L500 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:01,652 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-18 00:16:01,847 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,SelfDestructingSolverStorable6,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:01,847 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:01,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:01,848 INFO L85 PathProgramCache]: Analyzing trace with hash 1105142364, now seen corresponding path program 7 times [2022-03-18 00:16:01,848 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:01,848 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2020188263] [2022-03-18 00:16:01,884 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:01,884 INFO L85 PathProgramCache]: Analyzing trace with hash -1689991753, now seen corresponding path program 1 times [2022-03-18 00:16:01,885 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:01,885 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2013843134] [2022-03-18 00:16:01,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:01,885 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:01,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:01,893 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:01,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:01,900 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:01,900 INFO L85 PathProgramCache]: Analyzing trace with hash 1105142364, now seen corresponding path program 8 times [2022-03-18 00:16:01,900 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:01,900 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1892472509] [2022-03-18 00:16:01,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:01,901 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:01,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:01,978 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:01,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:01,985 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:01,986 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:01,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1892472509] [2022-03-18 00:16:01,986 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1892472509] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:01,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [520705743] [2022-03-18 00:16:01,986 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:16:01,986 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:01,987 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:01,988 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) [2022-03-18 00:16:02,011 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-18 00:16:02,014 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:16:02,014 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:02,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-18 00:16:02,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:02,063 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:02,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:02,134 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:02,134 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [520705743] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:02,134 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:02,134 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 14 [2022-03-18 00:16:02,134 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:02,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2020188263] [2022-03-18 00:16:02,134 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2020188263] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:02,134 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:02,134 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-18 00:16:02,135 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820776603] [2022-03-18 00:16:02,135 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:02,135 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-18 00:16:02,135 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:02,135 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-18 00:16:02,135 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=122, Unknown=0, NotChecked=0, Total=182 [2022-03-18 00:16:02,135 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:02,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:02,200 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2022-03-18 00:16:02,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-18 00:16:02,201 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-03-18 00:16:02,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:02,201 INFO L225 Difference]: With dead ends: 22 [2022-03-18 00:16:02,201 INFO L226 Difference]: Without dead ends: 17 [2022-03-18 00:16:02,201 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=113, Invalid=229, Unknown=0, NotChecked=0, Total=342 [2022-03-18 00:16:02,202 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:02,202 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 28 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 00:16:02,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-03-18 00:16:02,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-03-18 00:16:02,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 12 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:02,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2022-03-18 00:16:02,205 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2022-03-18 00:16:02,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:02,205 INFO L478 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2022-03-18 00:16:02,205 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:02,205 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2022-03-18 00:16:02,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-03-18 00:16:02,205 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:02,205 INFO L500 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:02,222 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-18 00:16:02,422 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,SelfDestructingSolverStorable9,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:02,422 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:02,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:02,422 INFO L85 PathProgramCache]: Analyzing trace with hash -63863818, now seen corresponding path program 9 times [2022-03-18 00:16:02,423 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:02,423 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1761707349] [2022-03-18 00:16:02,450 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:02,450 INFO L85 PathProgramCache]: Analyzing trace with hash -1630886409, now seen corresponding path program 1 times [2022-03-18 00:16:02,450 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:02,450 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1873904783] [2022-03-18 00:16:02,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:02,450 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:02,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:02,468 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:02,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:02,475 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:02,475 INFO L85 PathProgramCache]: Analyzing trace with hash -63863818, now seen corresponding path program 10 times [2022-03-18 00:16:02,475 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:02,475 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [49489918] [2022-03-18 00:16:02,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:02,475 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:02,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:02,540 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:02,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:02,545 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:02,545 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:02,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [49489918] [2022-03-18 00:16:02,546 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [49489918] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:02,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1281735967] [2022-03-18 00:16:02,546 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:16:02,546 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:02,546 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:02,547 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) [2022-03-18 00:16:02,548 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-18 00:16:02,575 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:16:02,575 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:02,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 13 conjunts are in the unsatisfiable core [2022-03-18 00:16:02,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:02,628 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:02,628 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:02,719 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:02,719 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1281735967] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:02,719 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:02,719 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 16 [2022-03-18 00:16:02,719 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:02,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1761707349] [2022-03-18 00:16:02,720 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1761707349] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:02,720 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:02,720 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-18 00:16:02,720 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113817883] [2022-03-18 00:16:02,720 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:02,720 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-18 00:16:02,720 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:02,720 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-18 00:16:02,720 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=163, Unknown=0, NotChecked=0, Total=240 [2022-03-18 00:16:02,721 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand has 9 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:02,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:02,802 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2022-03-18 00:16:02,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-18 00:16:02,803 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 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 16 [2022-03-18 00:16:02,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:02,803 INFO L225 Difference]: With dead ends: 23 [2022-03-18 00:16:02,803 INFO L226 Difference]: Without dead ends: 18 [2022-03-18 00:16:02,804 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=147, Invalid=315, Unknown=0, NotChecked=0, Total=462 [2022-03-18 00:16:02,804 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:02,804 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 38 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 00:16:02,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-03-18 00:16:02,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-03-18 00:16:02,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.0769230769230769) internal successors, (14), 13 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:02,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2022-03-18 00:16:02,807 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2022-03-18 00:16:02,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:02,807 INFO L478 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2022-03-18 00:16:02,807 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:02,807 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2022-03-18 00:16:02,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-18 00:16:02,807 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:02,807 INFO L500 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:02,826 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-18 00:16:03,008 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10,SelfDestructingSolverStorable11 [2022-03-18 00:16:03,008 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:03,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:03,009 INFO L85 PathProgramCache]: Analyzing trace with hash -1943317092, now seen corresponding path program 11 times [2022-03-18 00:16:03,009 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:03,009 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [894183631] [2022-03-18 00:16:03,036 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:03,036 INFO L85 PathProgramCache]: Analyzing trace with hash -1571781065, now seen corresponding path program 1 times [2022-03-18 00:16:03,036 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:03,036 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [180975040] [2022-03-18 00:16:03,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:03,036 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:03,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:03,056 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:03,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:03,062 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:03,062 INFO L85 PathProgramCache]: Analyzing trace with hash -1943317092, now seen corresponding path program 12 times [2022-03-18 00:16:03,062 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:03,062 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724949587] [2022-03-18 00:16:03,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:03,062 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:03,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:03,130 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:03,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:03,139 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:03,139 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:03,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724949587] [2022-03-18 00:16:03,139 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1724949587] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:03,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1285363142] [2022-03-18 00:16:03,139 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:16:03,140 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:03,140 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:03,141 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) [2022-03-18 00:16:03,142 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-18 00:16:03,168 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-18 00:16:03,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:03,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 18 conjunts are in the unsatisfiable core [2022-03-18 00:16:03,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:03,218 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:03,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:03,438 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:03,438 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1285363142] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:03,438 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:03,438 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 12] total 21 [2022-03-18 00:16:03,439 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:03,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [894183631] [2022-03-18 00:16:03,439 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [894183631] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:03,439 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:03,439 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-18 00:16:03,439 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489258589] [2022-03-18 00:16:03,439 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:03,439 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-18 00:16:03,439 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:03,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-18 00:16:03,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=311, Unknown=0, NotChecked=0, Total=420 [2022-03-18 00:16:03,440 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand has 10 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:03,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:03,544 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2022-03-18 00:16:03,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-18 00:16:03,544 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 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 17 [2022-03-18 00:16:03,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:03,545 INFO L225 Difference]: With dead ends: 24 [2022-03-18 00:16:03,545 INFO L226 Difference]: Without dead ends: 19 [2022-03-18 00:16:03,545 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=198, Invalid=558, Unknown=0, NotChecked=0, Total=756 [2022-03-18 00:16:03,546 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:03,546 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 28 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 00:16:03,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-03-18 00:16:03,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-03-18 00:16:03,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:03,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2022-03-18 00:16:03,548 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2022-03-18 00:16:03,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:03,548 INFO L478 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2022-03-18 00:16:03,548 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:03,549 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2022-03-18 00:16:03,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-18 00:16:03,549 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:03,549 INFO L500 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:03,567 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-18 00:16:03,759 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,SelfDestructingSolverStorable13,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:03,759 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:03,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:03,760 INFO L85 PathProgramCache]: Analyzing trace with hash -76826442, now seen corresponding path program 13 times [2022-03-18 00:16:03,760 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:03,760 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1435580501] [2022-03-18 00:16:03,784 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:03,784 INFO L85 PathProgramCache]: Analyzing trace with hash -1512675721, now seen corresponding path program 1 times [2022-03-18 00:16:03,785 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:03,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [962496184] [2022-03-18 00:16:03,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:03,785 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:03,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:03,790 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:03,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:03,795 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:03,795 INFO L85 PathProgramCache]: Analyzing trace with hash -76826442, now seen corresponding path program 14 times [2022-03-18 00:16:03,795 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:03,795 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2109812509] [2022-03-18 00:16:03,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:03,795 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:03,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:03,874 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:03,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:03,878 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:03,878 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:03,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2109812509] [2022-03-18 00:16:03,878 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2109812509] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:03,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1113915284] [2022-03-18 00:16:03,878 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:16:03,879 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:03,879 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:03,879 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) [2022-03-18 00:16:03,880 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-18 00:16:03,905 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:16:03,905 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:03,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 17 conjunts are in the unsatisfiable core [2022-03-18 00:16:03,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:03,963 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:03,963 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:04,099 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:04,100 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1113915284] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:04,100 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:04,100 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 20 [2022-03-18 00:16:04,100 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:04,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1435580501] [2022-03-18 00:16:04,100 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1435580501] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:04,100 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:04,100 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-18 00:16:04,100 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099438161] [2022-03-18 00:16:04,100 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:04,100 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-18 00:16:04,101 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:04,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-18 00:16:04,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=263, Unknown=0, NotChecked=0, Total=380 [2022-03-18 00:16:04,101 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand has 11 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:04,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:04,206 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2022-03-18 00:16:04,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-18 00:16:04,207 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 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 18 [2022-03-18 00:16:04,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:04,208 INFO L225 Difference]: With dead ends: 25 [2022-03-18 00:16:04,208 INFO L226 Difference]: Without dead ends: 20 [2022-03-18 00:16:04,208 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=227, Invalid=529, Unknown=0, NotChecked=0, Total=756 [2022-03-18 00:16:04,209 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:04,209 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 18 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 00:16:04,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-03-18 00:16:04,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-03-18 00:16:04,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 15 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:04,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2022-03-18 00:16:04,212 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2022-03-18 00:16:04,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:04,212 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2022-03-18 00:16:04,212 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:04,212 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2022-03-18 00:16:04,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-18 00:16:04,212 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:04,212 INFO L500 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:04,232 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-18 00:16:04,423 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,SelfDestructingSolverStorable15,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:04,423 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:04,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:04,424 INFO L85 PathProgramCache]: Analyzing trace with hash 1949808860, now seen corresponding path program 15 times [2022-03-18 00:16:04,424 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:04,424 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [524474029] [2022-03-18 00:16:04,447 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:04,447 INFO L85 PathProgramCache]: Analyzing trace with hash -1453570377, now seen corresponding path program 1 times [2022-03-18 00:16:04,448 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:04,448 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349861840] [2022-03-18 00:16:04,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:04,448 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:04,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:04,453 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:04,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:04,457 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:04,457 INFO L85 PathProgramCache]: Analyzing trace with hash 1949808860, now seen corresponding path program 16 times [2022-03-18 00:16:04,458 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:04,458 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [410623569] [2022-03-18 00:16:04,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:04,458 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:04,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:04,561 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:04,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:04,565 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:04,566 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:04,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [410623569] [2022-03-18 00:16:04,566 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [410623569] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:04,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1108966805] [2022-03-18 00:16:04,566 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:16:04,566 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:04,566 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:04,567 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) [2022-03-18 00:16:04,595 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:16:04,595 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:04,595 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-18 00:16:04,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 19 conjunts are in the unsatisfiable core [2022-03-18 00:16:04,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:04,647 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:04,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:04,815 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:04,815 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1108966805] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:04,815 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:04,815 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 22 [2022-03-18 00:16:04,816 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:04,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [524474029] [2022-03-18 00:16:04,816 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [524474029] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:04,816 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:04,816 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-18 00:16:04,816 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449335515] [2022-03-18 00:16:04,816 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:04,816 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-18 00:16:04,816 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:04,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-18 00:16:04,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=322, Unknown=0, NotChecked=0, Total=462 [2022-03-18 00:16:04,817 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand has 12 states, 12 states have (on average 1.25) internal successors, (15), 11 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:04,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:04,929 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2022-03-18 00:16:04,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-18 00:16:04,930 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.25) internal successors, (15), 11 states have internal predecessors, (15), 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 19 [2022-03-18 00:16:04,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:04,930 INFO L225 Difference]: With dead ends: 26 [2022-03-18 00:16:04,930 INFO L226 Difference]: Without dead ends: 21 [2022-03-18 00:16:04,931 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=273, Invalid=657, Unknown=0, NotChecked=0, Total=930 [2022-03-18 00:16:04,931 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:04,931 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 38 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 00:16:04,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-03-18 00:16:04,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-03-18 00:16:04,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.0625) internal successors, (17), 16 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:04,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2022-03-18 00:16:04,934 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2022-03-18 00:16:04,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:04,934 INFO L478 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2022-03-18 00:16:04,934 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.25) internal successors, (15), 11 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:04,934 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2022-03-18 00:16:04,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-18 00:16:04,934 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:04,934 INFO L500 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:04,950 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-03-18 00:16:05,143 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16,SelfDestructingSolverStorable17 [2022-03-18 00:16:05,143 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:05,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:05,144 INFO L85 PathProgramCache]: Analyzing trace with hash 350993782, now seen corresponding path program 17 times [2022-03-18 00:16:05,144 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:05,144 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1561385458] [2022-03-18 00:16:05,185 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:05,185 INFO L85 PathProgramCache]: Analyzing trace with hash -1394465033, now seen corresponding path program 1 times [2022-03-18 00:16:05,185 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:05,185 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1692197178] [2022-03-18 00:16:05,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:05,185 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:05,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:05,201 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:05,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:05,211 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:05,211 INFO L85 PathProgramCache]: Analyzing trace with hash 350993782, now seen corresponding path program 18 times [2022-03-18 00:16:05,211 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:05,211 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2136286451] [2022-03-18 00:16:05,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:05,211 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:05,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:05,334 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:05,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:05,344 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:05,344 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:05,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2136286451] [2022-03-18 00:16:05,344 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2136286451] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:05,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1838750763] [2022-03-18 00:16:05,345 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:16:05,345 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:05,345 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:05,346 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) [2022-03-18 00:16:05,347 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-18 00:16:05,395 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2022-03-18 00:16:05,396 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:05,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 21 conjunts are in the unsatisfiable core [2022-03-18 00:16:05,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:05,468 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:05,468 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:05,687 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:05,688 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1838750763] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:05,688 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:05,688 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 24 [2022-03-18 00:16:05,688 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:05,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1561385458] [2022-03-18 00:16:05,688 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1561385458] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:05,688 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:05,688 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-18 00:16:05,688 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97498344] [2022-03-18 00:16:05,688 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:05,688 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-18 00:16:05,688 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:05,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-18 00:16:05,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=387, Unknown=0, NotChecked=0, Total=552 [2022-03-18 00:16:05,689 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:05,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:05,828 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2022-03-18 00:16:05,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-18 00:16:05,828 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 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 20 [2022-03-18 00:16:05,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:05,828 INFO L225 Difference]: With dead ends: 27 [2022-03-18 00:16:05,828 INFO L226 Difference]: Without dead ends: 22 [2022-03-18 00:16:05,829 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=323, Invalid=799, Unknown=0, NotChecked=0, Total=1122 [2022-03-18 00:16:05,829 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:05,830 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 23 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 00:16:05,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-03-18 00:16:05,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-03-18 00:16:05,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.0588235294117647) internal successors, (18), 17 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:05,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2022-03-18 00:16:05,832 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2022-03-18 00:16:05,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:05,832 INFO L478 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2022-03-18 00:16:05,833 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:05,833 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2022-03-18 00:16:05,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-18 00:16:05,833 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:05,833 INFO L500 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:05,839 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-18 00:16:06,037 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,SelfDestructingSolverStorable19,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:06,037 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:06,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:06,038 INFO L85 PathProgramCache]: Analyzing trace with hash -1967633380, now seen corresponding path program 19 times [2022-03-18 00:16:06,038 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:06,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1026285017] [2022-03-18 00:16:06,063 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:06,063 INFO L85 PathProgramCache]: Analyzing trace with hash -1335359689, now seen corresponding path program 1 times [2022-03-18 00:16:06,063 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:06,063 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1120301824] [2022-03-18 00:16:06,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:06,064 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:06,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:06,068 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:06,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:06,072 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:06,072 INFO L85 PathProgramCache]: Analyzing trace with hash -1967633380, now seen corresponding path program 20 times [2022-03-18 00:16:06,073 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:06,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [202411744] [2022-03-18 00:16:06,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:06,073 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:06,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:06,183 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:06,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:06,186 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:06,186 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:06,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [202411744] [2022-03-18 00:16:06,186 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [202411744] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:06,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1643439469] [2022-03-18 00:16:06,186 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:16:06,186 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:06,186 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:06,187 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) [2022-03-18 00:16:06,190 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-18 00:16:06,248 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:16:06,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:06,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 23 conjunts are in the unsatisfiable core [2022-03-18 00:16:06,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:06,307 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:06,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:06,580 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:06,581 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1643439469] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:06,581 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:06,581 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 26 [2022-03-18 00:16:06,581 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:06,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1026285017] [2022-03-18 00:16:06,581 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1026285017] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:06,581 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:06,581 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-18 00:16:06,581 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769344632] [2022-03-18 00:16:06,581 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:06,582 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-18 00:16:06,582 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:06,582 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-18 00:16:06,582 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=458, Unknown=0, NotChecked=0, Total=650 [2022-03-18 00:16:06,582 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand has 14 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 13 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:06,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:06,741 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2022-03-18 00:16:06,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-18 00:16:06,743 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 13 states have internal predecessors, (17), 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 21 [2022-03-18 00:16:06,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:06,743 INFO L225 Difference]: With dead ends: 28 [2022-03-18 00:16:06,743 INFO L226 Difference]: Without dead ends: 23 [2022-03-18 00:16:06,744 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=377, Invalid=955, Unknown=0, NotChecked=0, Total=1332 [2022-03-18 00:16:06,744 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:06,744 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 28 Invalid, 150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 00:16:06,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-18 00:16:06,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-03-18 00:16:06,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.0555555555555556) internal successors, (19), 18 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:06,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2022-03-18 00:16:06,747 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2022-03-18 00:16:06,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:06,747 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2022-03-18 00:16:06,747 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 13 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:06,747 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2022-03-18 00:16:06,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-18 00:16:06,748 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:06,748 INFO L500 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:06,768 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-18 00:16:06,963 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20,SelfDestructingSolverStorable21 [2022-03-18 00:16:06,963 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:06,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:06,964 INFO L85 PathProgramCache]: Analyzing trace with hash -830631370, now seen corresponding path program 21 times [2022-03-18 00:16:06,964 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:06,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [340722803] [2022-03-18 00:16:06,990 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:06,991 INFO L85 PathProgramCache]: Analyzing trace with hash -1276254345, now seen corresponding path program 1 times [2022-03-18 00:16:06,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:06,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1661396535] [2022-03-18 00:16:06,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:06,991 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:06,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:06,995 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:06,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:06,998 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:06,999 INFO L85 PathProgramCache]: Analyzing trace with hash -830631370, now seen corresponding path program 22 times [2022-03-18 00:16:06,999 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:06,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575430101] [2022-03-18 00:16:06,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:06,999 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:07,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:07,130 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:07,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:07,134 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:07,134 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:07,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575430101] [2022-03-18 00:16:07,134 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [575430101] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:07,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2021701409] [2022-03-18 00:16:07,134 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:16:07,134 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:07,134 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:07,148 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) [2022-03-18 00:16:07,163 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-18 00:16:07,193 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:16:07,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:07,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 25 conjunts are in the unsatisfiable core [2022-03-18 00:16:07,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:07,272 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:07,273 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:07,572 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:07,573 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2021701409] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:07,573 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:07,573 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 28 [2022-03-18 00:16:07,573 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:07,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [340722803] [2022-03-18 00:16:07,573 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [340722803] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:07,573 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:07,573 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-18 00:16:07,573 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390811910] [2022-03-18 00:16:07,573 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:07,574 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-18 00:16:07,574 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:07,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-18 00:16:07,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=535, Unknown=0, NotChecked=0, Total=756 [2022-03-18 00:16:07,574 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand has 15 states, 15 states have (on average 1.2) internal successors, (18), 14 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:07,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:07,783 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2022-03-18 00:16:07,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-18 00:16:07,784 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.2) internal successors, (18), 14 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2022-03-18 00:16:07,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:07,784 INFO L225 Difference]: With dead ends: 29 [2022-03-18 00:16:07,784 INFO L226 Difference]: Without dead ends: 24 [2022-03-18 00:16:07,785 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=435, Invalid=1125, Unknown=0, NotChecked=0, Total=1560 [2022-03-18 00:16:07,785 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:07,785 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 23 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 00:16:07,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-03-18 00:16:07,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-03-18 00:16:07,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.0526315789473684) internal successors, (20), 19 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:07,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2022-03-18 00:16:07,788 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2022-03-18 00:16:07,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:07,788 INFO L478 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2022-03-18 00:16:07,788 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.2) internal successors, (18), 14 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:07,788 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2022-03-18 00:16:07,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-18 00:16:07,788 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:07,788 INFO L500 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:07,804 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-03-18 00:16:08,002 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22,SelfDestructingSolverStorable23 [2022-03-18 00:16:08,002 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:08,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:08,002 INFO L85 PathProgramCache]: Analyzing trace with hash 56692572, now seen corresponding path program 23 times [2022-03-18 00:16:08,003 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:08,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1630498032] [2022-03-18 00:16:08,025 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:08,025 INFO L85 PathProgramCache]: Analyzing trace with hash -1217149001, now seen corresponding path program 1 times [2022-03-18 00:16:08,025 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:08,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1038469646] [2022-03-18 00:16:08,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:08,025 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:08,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:08,029 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:08,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:08,032 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:08,033 INFO L85 PathProgramCache]: Analyzing trace with hash 56692572, now seen corresponding path program 24 times [2022-03-18 00:16:08,033 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:08,033 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2089879334] [2022-03-18 00:16:08,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:08,033 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:08,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:08,160 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:08,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:08,175 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:08,176 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:08,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2089879334] [2022-03-18 00:16:08,176 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2089879334] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:08,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1504448613] [2022-03-18 00:16:08,176 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:16:08,176 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:08,176 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:08,177 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) [2022-03-18 00:16:08,195 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-18 00:16:08,252 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-18 00:16:08,252 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:08,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-18 00:16:08,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:08,328 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:08,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:08,843 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:08,843 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1504448613] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:08,843 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:08,843 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 18] total 33 [2022-03-18 00:16:08,844 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:08,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1630498032] [2022-03-18 00:16:08,844 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1630498032] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:08,844 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:08,844 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-18 00:16:08,844 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656660995] [2022-03-18 00:16:08,844 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:08,844 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-18 00:16:08,844 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:08,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-18 00:16:08,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=785, Unknown=0, NotChecked=0, Total=1056 [2022-03-18 00:16:08,845 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand has 16 states, 16 states have (on average 1.1875) internal successors, (19), 15 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:09,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:09,070 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2022-03-18 00:16:09,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-18 00:16:09,071 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.1875) internal successors, (19), 15 states have internal predecessors, (19), 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 23 [2022-03-18 00:16:09,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:09,071 INFO L225 Difference]: With dead ends: 30 [2022-03-18 00:16:09,071 INFO L226 Difference]: Without dead ends: 25 [2022-03-18 00:16:09,072 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=516, Invalid=1554, Unknown=0, NotChecked=0, Total=2070 [2022-03-18 00:16:09,072 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:09,072 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 58 Invalid, 230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 203 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 00:16:09,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-03-18 00:16:09,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-03-18 00:16:09,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.05) internal successors, (21), 20 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:09,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2022-03-18 00:16:09,075 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2022-03-18 00:16:09,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:09,075 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2022-03-18 00:16:09,075 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.1875) internal successors, (19), 15 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:09,075 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2022-03-18 00:16:09,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-18 00:16:09,075 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:09,075 INFO L500 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:09,081 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-03-18 00:16:09,281 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24,SelfDestructingSolverStorable25 [2022-03-18 00:16:09,282 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:09,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:09,282 INFO L85 PathProgramCache]: Analyzing trace with hash 1793930998, now seen corresponding path program 25 times [2022-03-18 00:16:09,282 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:09,282 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1597423425] [2022-03-18 00:16:09,312 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:09,312 INFO L85 PathProgramCache]: Analyzing trace with hash -1158043657, now seen corresponding path program 1 times [2022-03-18 00:16:09,312 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:09,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [416495006] [2022-03-18 00:16:09,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:09,312 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:09,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:09,316 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:09,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:09,319 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:09,319 INFO L85 PathProgramCache]: Analyzing trace with hash 1793930998, now seen corresponding path program 26 times [2022-03-18 00:16:09,319 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:09,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1803289102] [2022-03-18 00:16:09,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:09,319 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:09,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:09,479 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:09,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:09,486 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:09,486 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:09,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1803289102] [2022-03-18 00:16:09,486 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1803289102] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:09,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1223078006] [2022-03-18 00:16:09,486 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:16:09,486 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:09,487 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:09,488 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) [2022-03-18 00:16:09,488 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-18 00:16:09,513 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:16:09,513 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:09,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-18 00:16:09,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:09,597 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:09,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:10,008 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:10,008 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1223078006] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:10,008 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:10,008 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 32 [2022-03-18 00:16:10,008 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:10,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1597423425] [2022-03-18 00:16:10,008 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1597423425] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:10,008 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:10,009 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-18 00:16:10,009 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064685612] [2022-03-18 00:16:10,009 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:10,009 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-18 00:16:10,009 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:10,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-18 00:16:10,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=285, Invalid=707, Unknown=0, NotChecked=0, Total=992 [2022-03-18 00:16:10,010 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand has 17 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 16 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:10,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:10,258 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2022-03-18 00:16:10,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-18 00:16:10,259 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 16 states have internal predecessors, (20), 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 24 [2022-03-18 00:16:10,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:10,259 INFO L225 Difference]: With dead ends: 31 [2022-03-18 00:16:10,259 INFO L226 Difference]: Without dead ends: 26 [2022-03-18 00:16:10,260 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=563, Invalid=1507, Unknown=0, NotChecked=0, Total=2070 [2022-03-18 00:16:10,260 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:10,260 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 48 Invalid, 248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 219 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 00:16:10,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-03-18 00:16:10,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-03-18 00:16:10,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.0476190476190477) internal successors, (22), 21 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:10,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2022-03-18 00:16:10,263 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2022-03-18 00:16:10,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:10,263 INFO L478 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2022-03-18 00:16:10,263 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 16 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:10,263 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2022-03-18 00:16:10,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-18 00:16:10,264 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:10,264 INFO L500 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:10,280 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-18 00:16:10,479 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26,SelfDestructingSolverStorable27 [2022-03-18 00:16:10,479 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:10,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:10,480 INFO L85 PathProgramCache]: Analyzing trace with hash -186252644, now seen corresponding path program 27 times [2022-03-18 00:16:10,480 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:10,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1748604412] [2022-03-18 00:16:10,500 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:10,500 INFO L85 PathProgramCache]: Analyzing trace with hash -1098938313, now seen corresponding path program 1 times [2022-03-18 00:16:10,501 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:10,501 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1080552922] [2022-03-18 00:16:10,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:10,501 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:10,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:10,505 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:10,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:10,511 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:10,511 INFO L85 PathProgramCache]: Analyzing trace with hash -186252644, now seen corresponding path program 28 times [2022-03-18 00:16:10,511 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:10,511 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1951739705] [2022-03-18 00:16:10,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:10,512 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:10,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:10,684 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:10,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:10,687 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:10,687 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:10,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1951739705] [2022-03-18 00:16:10,687 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1951739705] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:10,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1506268849] [2022-03-18 00:16:10,687 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:16:10,687 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:10,687 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:10,692 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) [2022-03-18 00:16:10,715 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-18 00:16:10,729 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:16:10,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:10,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-18 00:16:10,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:10,813 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:10,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:11,320 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:11,320 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1506268849] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:11,320 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:11,320 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 34 [2022-03-18 00:16:11,320 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:11,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1748604412] [2022-03-18 00:16:11,320 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1748604412] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:11,320 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:11,320 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-18 00:16:11,320 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156671396] [2022-03-18 00:16:11,320 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:11,321 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-18 00:16:11,321 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:11,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-18 00:16:11,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=320, Invalid=802, Unknown=0, NotChecked=0, Total=1122 [2022-03-18 00:16:11,321 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand has 18 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 17 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:11,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:11,587 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2022-03-18 00:16:11,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-18 00:16:11,587 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 17 states have internal predecessors, (21), 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 25 [2022-03-18 00:16:11,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:11,588 INFO L225 Difference]: With dead ends: 32 [2022-03-18 00:16:11,588 INFO L226 Difference]: Without dead ends: 27 [2022-03-18 00:16:11,588 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=633, Invalid=1719, Unknown=0, NotChecked=0, Total=2352 [2022-03-18 00:16:11,589 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 242 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:11,589 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 43 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 00:16:11,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-03-18 00:16:11,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-03-18 00:16:11,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.0454545454545454) internal successors, (23), 22 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:11,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2022-03-18 00:16:11,592 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2022-03-18 00:16:11,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:11,592 INFO L478 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2022-03-18 00:16:11,592 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 17 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:11,592 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2022-03-18 00:16:11,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-03-18 00:16:11,593 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:11,593 INFO L500 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:11,609 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-03-18 00:16:11,795 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,SelfDestructingSolverStorable28,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:11,795 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:11,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:11,796 INFO L85 PathProgramCache]: Analyzing trace with hash -1442403402, now seen corresponding path program 29 times [2022-03-18 00:16:11,796 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:11,796 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [628865546] [2022-03-18 00:16:11,817 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:11,817 INFO L85 PathProgramCache]: Analyzing trace with hash -1039832969, now seen corresponding path program 1 times [2022-03-18 00:16:11,817 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:11,818 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1778133023] [2022-03-18 00:16:11,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:11,818 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:11,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:11,835 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:11,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:11,839 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:11,839 INFO L85 PathProgramCache]: Analyzing trace with hash -1442403402, now seen corresponding path program 30 times [2022-03-18 00:16:11,839 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:11,839 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [327911098] [2022-03-18 00:16:11,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:11,840 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:11,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:12,035 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:12,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:12,039 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:12,039 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:12,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [327911098] [2022-03-18 00:16:12,039 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [327911098] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:12,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [499354457] [2022-03-18 00:16:12,039 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:16:12,040 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:12,040 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:12,041 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) [2022-03-18 00:16:12,042 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-18 00:16:12,096 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2022-03-18 00:16:12,096 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:12,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 36 conjunts are in the unsatisfiable core [2022-03-18 00:16:12,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:12,192 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:12,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:12,983 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:12,983 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [499354457] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:12,983 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:12,983 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 21] total 39 [2022-03-18 00:16:12,983 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:12,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [628865546] [2022-03-18 00:16:12,983 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [628865546] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:12,983 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:12,983 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-18 00:16:12,983 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1938312474] [2022-03-18 00:16:12,983 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:12,984 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-18 00:16:12,984 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:12,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-18 00:16:12,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=379, Invalid=1103, Unknown=0, NotChecked=0, Total=1482 [2022-03-18 00:16:12,984 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:13,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:13,282 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2022-03-18 00:16:13,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-18 00:16:13,282 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 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 26 [2022-03-18 00:16:13,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:13,283 INFO L225 Difference]: With dead ends: 33 [2022-03-18 00:16:13,283 INFO L226 Difference]: Without dead ends: 28 [2022-03-18 00:16:13,284 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=729, Invalid=2241, Unknown=0, NotChecked=0, Total=2970 [2022-03-18 00:16:13,284 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 262 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 295 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 262 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:13,284 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 33 Invalid, 295 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 262 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 00:16:13,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-03-18 00:16:13,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-03-18 00:16:13,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.0434782608695652) internal successors, (24), 23 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:13,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2022-03-18 00:16:13,290 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2022-03-18 00:16:13,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:13,290 INFO L478 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2022-03-18 00:16:13,290 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:13,291 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2022-03-18 00:16:13,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-18 00:16:13,293 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:13,293 INFO L500 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:13,310 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-18 00:16:13,501 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,SelfDestructingSolverStorable31,16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:13,501 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:13,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:13,502 INFO L85 PathProgramCache]: Analyzing trace with hash -1728371236, now seen corresponding path program 31 times [2022-03-18 00:16:13,502 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:13,502 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [764534563] [2022-03-18 00:16:13,523 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:13,523 INFO L85 PathProgramCache]: Analyzing trace with hash -980727625, now seen corresponding path program 1 times [2022-03-18 00:16:13,523 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:13,523 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1756726443] [2022-03-18 00:16:13,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:13,524 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:13,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:13,531 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:13,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:13,542 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:13,542 INFO L85 PathProgramCache]: Analyzing trace with hash -1728371236, now seen corresponding path program 32 times [2022-03-18 00:16:13,542 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:13,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411239426] [2022-03-18 00:16:13,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:13,542 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:13,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:13,741 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:13,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:13,748 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:13,748 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:13,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411239426] [2022-03-18 00:16:13,748 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1411239426] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:13,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [450277707] [2022-03-18 00:16:13,748 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:16:13,748 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:13,748 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:13,749 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) [2022-03-18 00:16:13,750 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-18 00:16:13,778 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:16:13,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:13,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-18 00:16:13,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:13,877 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:13,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:14,581 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:14,581 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [450277707] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:14,581 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:14,581 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 38 [2022-03-18 00:16:14,581 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:14,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [764534563] [2022-03-18 00:16:14,581 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [764534563] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:14,581 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:14,581 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-18 00:16:14,581 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989806188] [2022-03-18 00:16:14,582 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:14,582 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-18 00:16:14,582 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:14,582 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-18 00:16:14,582 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=396, Invalid=1010, Unknown=0, NotChecked=0, Total=1406 [2022-03-18 00:16:14,583 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand has 20 states, 20 states have (on average 1.15) internal successors, (23), 19 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:14,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:14,937 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2022-03-18 00:16:14,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-18 00:16:14,937 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.15) internal successors, (23), 19 states have internal predecessors, (23), 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 27 [2022-03-18 00:16:14,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:14,937 INFO L225 Difference]: With dead ends: 34 [2022-03-18 00:16:14,937 INFO L226 Difference]: Without dead ends: 29 [2022-03-18 00:16:14,938 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=785, Invalid=2185, Unknown=0, NotChecked=0, Total=2970 [2022-03-18 00:16:14,939 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 384 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:14,939 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 88 Invalid, 384 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 349 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 00:16:14,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-18 00:16:14,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-03-18 00:16:14,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.0416666666666667) internal successors, (25), 24 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:14,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2022-03-18 00:16:14,942 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2022-03-18 00:16:14,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:14,942 INFO L478 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2022-03-18 00:16:14,942 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.15) internal successors, (23), 19 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:14,942 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2022-03-18 00:16:14,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-18 00:16:14,942 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:14,942 INFO L500 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:14,961 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-18 00:16:15,155 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32,SelfDestructingSolverStorable33 [2022-03-18 00:16:15,155 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:15,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:15,156 INFO L85 PathProgramCache]: Analyzing trace with hash -2003439498, now seen corresponding path program 33 times [2022-03-18 00:16:15,156 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:15,156 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1949083454] [2022-03-18 00:16:15,178 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:15,178 INFO L85 PathProgramCache]: Analyzing trace with hash -921622281, now seen corresponding path program 1 times [2022-03-18 00:16:15,178 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:15,178 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [986583515] [2022-03-18 00:16:15,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:15,179 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:15,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:15,182 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:15,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:15,186 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:15,186 INFO L85 PathProgramCache]: Analyzing trace with hash -2003439498, now seen corresponding path program 34 times [2022-03-18 00:16:15,186 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:15,186 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1857509126] [2022-03-18 00:16:15,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:15,186 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:15,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:15,413 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:15,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:15,416 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:15,416 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:15,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1857509126] [2022-03-18 00:16:15,416 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1857509126] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:15,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1515466165] [2022-03-18 00:16:15,416 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:16:15,416 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:15,416 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:15,417 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) [2022-03-18 00:16:15,418 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-18 00:16:15,453 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:16:15,454 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:15,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 37 conjunts are in the unsatisfiable core [2022-03-18 00:16:15,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:15,574 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:15,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:16,411 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:16,411 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1515466165] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:16,411 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:16,411 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 40 [2022-03-18 00:16:16,411 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:16,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1949083454] [2022-03-18 00:16:16,412 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1949083454] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:16,412 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:16,412 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-18 00:16:16,412 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [860776371] [2022-03-18 00:16:16,412 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:16,412 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-18 00:16:16,412 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:16,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-18 00:16:16,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=1123, Unknown=0, NotChecked=0, Total=1560 [2022-03-18 00:16:16,413 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand has 21 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 20 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:16,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:16,772 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2022-03-18 00:16:16,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-03-18 00:16:16,772 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 20 states have internal predecessors, (24), 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 28 [2022-03-18 00:16:16,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:16,772 INFO L225 Difference]: With dead ends: 35 [2022-03-18 00:16:16,773 INFO L226 Difference]: Without dead ends: 30 [2022-03-18 00:16:16,774 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=867, Invalid=2439, Unknown=0, NotChecked=0, Total=3306 [2022-03-18 00:16:16,774 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 378 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 415 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 378 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:16,774 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 83 Invalid, 415 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 378 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 00:16:16,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-03-18 00:16:16,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-03-18 00:16:16,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.04) internal successors, (26), 25 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:16,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2022-03-18 00:16:16,777 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2022-03-18 00:16:16,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:16,777 INFO L478 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2022-03-18 00:16:16,777 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 20 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:16,777 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2022-03-18 00:16:16,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-18 00:16:16,778 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:16,778 INFO L500 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:16,795 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-03-18 00:16:16,989 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,SelfDestructingSolverStorable35,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:16,989 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:16,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:16,989 INFO L85 PathProgramCache]: Analyzing trace with hash -1940621028, now seen corresponding path program 35 times [2022-03-18 00:16:16,989 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:16,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1281908353] [2022-03-18 00:16:17,036 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:17,036 INFO L85 PathProgramCache]: Analyzing trace with hash -862516937, now seen corresponding path program 1 times [2022-03-18 00:16:17,036 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:17,037 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [56484699] [2022-03-18 00:16:17,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:17,037 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:17,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:17,041 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:17,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:17,045 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:17,045 INFO L85 PathProgramCache]: Analyzing trace with hash -1940621028, now seen corresponding path program 36 times [2022-03-18 00:16:17,045 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:17,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1063545551] [2022-03-18 00:16:17,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:17,046 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:17,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:17,316 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:17,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:17,319 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:17,319 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:17,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1063545551] [2022-03-18 00:16:17,319 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1063545551] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:17,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1111957278] [2022-03-18 00:16:17,320 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:16:17,320 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:17,320 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:17,321 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) [2022-03-18 00:16:17,322 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-18 00:16:17,449 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2022-03-18 00:16:17,449 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:17,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 47 conjunts are in the unsatisfiable core [2022-03-18 00:16:17,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:17,562 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:17,562 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:20,759 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:20,759 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1111957278] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:20,759 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:20,759 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 24] total 45 [2022-03-18 00:16:20,759 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:20,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1281908353] [2022-03-18 00:16:20,759 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1281908353] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:20,759 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:20,759 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-03-18 00:16:20,759 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1984449274] [2022-03-18 00:16:20,760 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:20,760 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-18 00:16:20,760 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:20,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-18 00:16:20,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=505, Invalid=1475, Unknown=0, NotChecked=0, Total=1980 [2022-03-18 00:16:20,761 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand has 22 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 21 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:21,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:21,174 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2022-03-18 00:16:21,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-18 00:16:21,175 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 21 states have internal predecessors, (25), 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 29 [2022-03-18 00:16:21,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:21,175 INFO L225 Difference]: With dead ends: 36 [2022-03-18 00:16:21,175 INFO L226 Difference]: Without dead ends: 31 [2022-03-18 00:16:21,176 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 219 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=978, Invalid=3054, Unknown=0, NotChecked=0, Total=4032 [2022-03-18 00:16:21,177 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 439 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 478 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 439 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:21,177 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 108 Invalid, 478 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 439 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 00:16:21,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-03-18 00:16:21,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-03-18 00:16:21,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:21,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2022-03-18 00:16:21,180 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2022-03-18 00:16:21,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:21,180 INFO L478 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2022-03-18 00:16:21,180 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 21 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:21,180 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2022-03-18 00:16:21,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-03-18 00:16:21,181 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:21,181 INFO L500 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:21,193 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-03-18 00:16:21,385 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-03-18 00:16:21,386 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:21,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:21,386 INFO L85 PathProgramCache]: Analyzing trace with hash 6751542, now seen corresponding path program 37 times [2022-03-18 00:16:21,386 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:21,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1580721359] [2022-03-18 00:16:21,408 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:21,408 INFO L85 PathProgramCache]: Analyzing trace with hash -803411593, now seen corresponding path program 1 times [2022-03-18 00:16:21,408 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:21,408 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1812502290] [2022-03-18 00:16:21,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:21,408 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:21,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:21,417 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:21,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:21,427 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:21,427 INFO L85 PathProgramCache]: Analyzing trace with hash 6751542, now seen corresponding path program 38 times [2022-03-18 00:16:21,427 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:21,427 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [915337903] [2022-03-18 00:16:21,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:21,427 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:21,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:21,703 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:21,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:21,707 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:21,707 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:21,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [915337903] [2022-03-18 00:16:21,707 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [915337903] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:21,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2041332927] [2022-03-18 00:16:21,707 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:16:21,707 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:21,707 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:21,708 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) [2022-03-18 00:16:21,734 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-18 00:16:21,752 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:16:21,752 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:21,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 41 conjunts are in the unsatisfiable core [2022-03-18 00:16:21,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:21,844 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:21,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:23,055 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:23,055 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2041332927] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:23,055 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:23,055 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 44 [2022-03-18 00:16:23,056 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:23,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1580721359] [2022-03-18 00:16:23,056 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1580721359] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:23,056 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:23,056 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-18 00:16:23,056 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450276727] [2022-03-18 00:16:23,056 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:23,056 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-18 00:16:23,056 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:23,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-18 00:16:23,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=525, Invalid=1367, Unknown=0, NotChecked=0, Total=1892 [2022-03-18 00:16:23,057 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand has 23 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 22 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:23,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:23,465 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2022-03-18 00:16:23,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-18 00:16:23,465 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 22 states have internal predecessors, (26), 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 30 [2022-03-18 00:16:23,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:23,465 INFO L225 Difference]: With dead ends: 37 [2022-03-18 00:16:23,466 INFO L226 Difference]: Without dead ends: 32 [2022-03-18 00:16:23,467 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1043, Invalid=2989, Unknown=0, NotChecked=0, Total=4032 [2022-03-18 00:16:23,467 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 412 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 453 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 412 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:23,467 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 43 Invalid, 453 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 412 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 00:16:23,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-03-18 00:16:23,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-03-18 00:16:23,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.037037037037037) internal successors, (28), 27 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:23,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2022-03-18 00:16:23,470 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2022-03-18 00:16:23,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:23,470 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2022-03-18 00:16:23,470 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 22 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:23,471 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2022-03-18 00:16:23,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-18 00:16:23,471 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:23,471 INFO L500 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:23,492 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-03-18 00:16:23,671 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-03-18 00:16:23,672 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:23,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:23,672 INFO L85 PathProgramCache]: Analyzing trace with hash 245759068, now seen corresponding path program 39 times [2022-03-18 00:16:23,672 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:23,672 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1277296142] [2022-03-18 00:16:23,696 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:23,696 INFO L85 PathProgramCache]: Analyzing trace with hash -744306249, now seen corresponding path program 1 times [2022-03-18 00:16:23,696 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:23,696 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [737833416] [2022-03-18 00:16:23,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:23,697 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:23,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:23,700 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:23,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:23,706 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:23,706 INFO L85 PathProgramCache]: Analyzing trace with hash 245759068, now seen corresponding path program 40 times [2022-03-18 00:16:23,706 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:23,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1689454831] [2022-03-18 00:16:23,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:23,707 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:23,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:23,981 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:23,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:23,985 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:23,986 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:23,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1689454831] [2022-03-18 00:16:23,986 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1689454831] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:23,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087990384] [2022-03-18 00:16:23,986 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:16:23,986 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:23,986 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:23,987 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) [2022-03-18 00:16:23,988 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-18 00:16:24,036 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:16:24,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:24,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 43 conjunts are in the unsatisfiable core [2022-03-18 00:16:24,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:24,137 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:24,137 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:25,530 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:25,530 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1087990384] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:25,531 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:25,531 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 46 [2022-03-18 00:16:25,531 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:25,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1277296142] [2022-03-18 00:16:25,531 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1277296142] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:25,531 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:25,531 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-03-18 00:16:25,531 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1877581547] [2022-03-18 00:16:25,531 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:25,531 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-03-18 00:16:25,531 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:25,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-03-18 00:16:25,532 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=572, Invalid=1498, Unknown=0, NotChecked=0, Total=2070 [2022-03-18 00:16:25,532 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand has 24 states, 24 states have (on average 1.125) internal successors, (27), 23 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:25,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:25,964 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2022-03-18 00:16:25,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-03-18 00:16:25,965 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.125) internal successors, (27), 23 states have internal predecessors, (27), 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 31 [2022-03-18 00:16:25,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:25,965 INFO L225 Difference]: With dead ends: 38 [2022-03-18 00:16:25,965 INFO L226 Difference]: Without dead ends: 33 [2022-03-18 00:16:25,966 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1137, Invalid=3285, Unknown=0, NotChecked=0, Total=4422 [2022-03-18 00:16:25,967 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 442 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 485 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 442 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:25,967 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 33 Invalid, 485 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 442 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 00:16:25,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-03-18 00:16:25,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-03-18 00:16:25,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.0357142857142858) internal successors, (29), 28 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:25,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2022-03-18 00:16:25,970 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2022-03-18 00:16:25,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:25,970 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2022-03-18 00:16:25,970 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.125) internal successors, (27), 23 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:25,970 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2022-03-18 00:16:25,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-18 00:16:25,971 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:25,971 INFO L500 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:25,989 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-03-18 00:16:26,186 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40,SelfDestructingSolverStorable41 [2022-03-18 00:16:26,186 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:26,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:26,186 INFO L85 PathProgramCache]: Analyzing trace with hash -934942218, now seen corresponding path program 41 times [2022-03-18 00:16:26,187 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:26,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1172873923] [2022-03-18 00:16:26,208 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:26,208 INFO L85 PathProgramCache]: Analyzing trace with hash -685200905, now seen corresponding path program 1 times [2022-03-18 00:16:26,208 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:26,208 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [392539325] [2022-03-18 00:16:26,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:26,209 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:26,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:26,213 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:26,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:26,224 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:26,224 INFO L85 PathProgramCache]: Analyzing trace with hash -934942218, now seen corresponding path program 42 times [2022-03-18 00:16:26,224 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:26,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [217523360] [2022-03-18 00:16:26,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:26,225 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:26,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:26,518 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:26,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:26,523 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:26,523 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:26,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [217523360] [2022-03-18 00:16:26,523 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [217523360] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:26,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1618884639] [2022-03-18 00:16:26,523 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:16:26,523 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:26,523 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:26,524 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) [2022-03-18 00:16:26,525 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-03-18 00:16:26,698 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2022-03-18 00:16:26,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:26,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 51 conjunts are in the unsatisfiable core [2022-03-18 00:16:26,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:26,800 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:26,800 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:28,619 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:28,619 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1618884639] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:28,619 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:28,619 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 27] total 51 [2022-03-18 00:16:28,619 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:28,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1172873923] [2022-03-18 00:16:28,619 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1172873923] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:28,619 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:28,619 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-03-18 00:16:28,619 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235380257] [2022-03-18 00:16:28,619 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:28,620 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-03-18 00:16:28,620 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:28,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-03-18 00:16:28,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=649, Invalid=1901, Unknown=0, NotChecked=0, Total=2550 [2022-03-18 00:16:28,621 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:29,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:29,112 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2022-03-18 00:16:29,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-03-18 00:16:29,112 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 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 32 [2022-03-18 00:16:29,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:29,112 INFO L225 Difference]: With dead ends: 39 [2022-03-18 00:16:29,112 INFO L226 Difference]: Without dead ends: 34 [2022-03-18 00:16:29,114 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 285 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1263, Invalid=3993, Unknown=0, NotChecked=0, Total=5256 [2022-03-18 00:16:29,114 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 559 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 604 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 559 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:29,114 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 108 Invalid, 604 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 559 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 00:16:29,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-03-18 00:16:29,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2022-03-18 00:16:29,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.0344827586206897) internal successors, (30), 29 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:29,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2022-03-18 00:16:29,117 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2022-03-18 00:16:29,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:29,117 INFO L478 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2022-03-18 00:16:29,117 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:29,118 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2022-03-18 00:16:29,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-18 00:16:29,118 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:29,118 INFO L500 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:29,124 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-03-18 00:16:29,322 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2022-03-18 00:16:29,323 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:29,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:29,323 INFO L85 PathProgramCache]: Analyzing trace with hash 1118023580, now seen corresponding path program 43 times [2022-03-18 00:16:29,323 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:29,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1708589997] [2022-03-18 00:16:29,344 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:29,345 INFO L85 PathProgramCache]: Analyzing trace with hash -626095561, now seen corresponding path program 1 times [2022-03-18 00:16:29,345 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:29,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1670647145] [2022-03-18 00:16:29,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:29,345 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:29,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:29,348 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:29,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:29,351 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:29,351 INFO L85 PathProgramCache]: Analyzing trace with hash 1118023580, now seen corresponding path program 44 times [2022-03-18 00:16:29,351 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:29,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1456094386] [2022-03-18 00:16:29,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:29,352 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:29,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:29,665 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:29,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:29,668 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:29,668 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:29,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1456094386] [2022-03-18 00:16:29,668 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1456094386] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:29,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1925364873] [2022-03-18 00:16:29,668 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:16:29,668 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:29,669 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:29,669 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) [2022-03-18 00:16:29,670 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-03-18 00:16:29,713 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:16:29,713 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:29,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 47 conjunts are in the unsatisfiable core [2022-03-18 00:16:29,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:29,804 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:29,804 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:31,681 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:31,682 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1925364873] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:31,682 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:31,682 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25] total 50 [2022-03-18 00:16:31,682 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:31,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1708589997] [2022-03-18 00:16:31,682 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1708589997] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:31,682 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:31,682 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-03-18 00:16:31,682 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739768522] [2022-03-18 00:16:31,682 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:31,682 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-18 00:16:31,682 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:31,683 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-18 00:16:31,683 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=1778, Unknown=0, NotChecked=0, Total=2450 [2022-03-18 00:16:31,683 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand has 26 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 25 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:32,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:32,162 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2022-03-18 00:16:32,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-03-18 00:16:32,162 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 25 states have internal predecessors, (29), 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 33 [2022-03-18 00:16:32,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:32,163 INFO L225 Difference]: With dead ends: 40 [2022-03-18 00:16:32,163 INFO L226 Difference]: Without dead ends: 35 [2022-03-18 00:16:32,164 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 303 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1337, Invalid=3919, Unknown=0, NotChecked=0, Total=5256 [2022-03-18 00:16:32,164 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 518 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 565 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 518 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:32,165 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 23 Invalid, 565 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 518 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 00:16:32,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-18 00:16:32,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-03-18 00:16:32,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.0333333333333334) internal successors, (31), 30 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:32,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2022-03-18 00:16:32,168 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2022-03-18 00:16:32,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:32,168 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2022-03-18 00:16:32,168 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 25 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:32,168 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2022-03-18 00:16:32,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-18 00:16:32,169 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:32,169 INFO L500 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:32,186 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-03-18 00:16:32,375 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,SelfDestructingSolverStorable45,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:32,375 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:32,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:32,376 INFO L85 PathProgramCache]: Analyzing trace with hash 335453878, now seen corresponding path program 45 times [2022-03-18 00:16:32,376 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:32,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [583318328] [2022-03-18 00:16:32,396 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:32,397 INFO L85 PathProgramCache]: Analyzing trace with hash -566990217, now seen corresponding path program 1 times [2022-03-18 00:16:32,397 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:32,397 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [485020962] [2022-03-18 00:16:32,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:32,397 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:32,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:32,401 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:32,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:32,404 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:32,404 INFO L85 PathProgramCache]: Analyzing trace with hash 335453878, now seen corresponding path program 46 times [2022-03-18 00:16:32,404 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:32,404 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [923055453] [2022-03-18 00:16:32,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:32,404 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:32,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:32,752 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:32,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:32,760 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:32,761 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:32,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [923055453] [2022-03-18 00:16:32,761 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [923055453] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:32,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1643596633] [2022-03-18 00:16:32,761 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:16:32,761 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:32,761 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:32,762 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 00:16:32,763 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-03-18 00:16:32,818 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:16:32,818 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:32,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 49 conjunts are in the unsatisfiable core [2022-03-18 00:16:32,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:32,922 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:32,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:35,165 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:35,166 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1643596633] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:35,167 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:35,167 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 52 [2022-03-18 00:16:35,168 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:35,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [583318328] [2022-03-18 00:16:35,168 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [583318328] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:35,168 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:35,168 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-03-18 00:16:35,168 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509791130] [2022-03-18 00:16:35,168 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:35,168 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-03-18 00:16:35,168 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:35,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-03-18 00:16:35,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=725, Invalid=1927, Unknown=0, NotChecked=0, Total=2652 [2022-03-18 00:16:35,169 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand has 27 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 26 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:35,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:35,758 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2022-03-18 00:16:35,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-03-18 00:16:35,758 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 26 states have internal predecessors, (30), 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 34 [2022-03-18 00:16:35,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:35,759 INFO L225 Difference]: With dead ends: 41 [2022-03-18 00:16:35,759 INFO L226 Difference]: Without dead ends: 36 [2022-03-18 00:16:35,760 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 328 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1443, Invalid=4257, Unknown=0, NotChecked=0, Total=5700 [2022-03-18 00:16:35,760 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 654 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 703 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 654 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:35,760 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 113 Invalid, 703 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 654 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-18 00:16:35,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-03-18 00:16:35,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2022-03-18 00:16:35,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.032258064516129) internal successors, (32), 31 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:35,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2022-03-18 00:16:35,765 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2022-03-18 00:16:35,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:35,765 INFO L478 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2022-03-18 00:16:35,766 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 26 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:35,766 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2022-03-18 00:16:35,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-18 00:16:35,766 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:35,766 INFO L500 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:35,783 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-03-18 00:16:35,966 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,SelfDestructingSolverStorable47,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:35,967 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:35,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:35,967 INFO L85 PathProgramCache]: Analyzing trace with hash 1845596892, now seen corresponding path program 47 times [2022-03-18 00:16:35,967 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:35,967 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1666562522] [2022-03-18 00:16:35,988 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:35,989 INFO L85 PathProgramCache]: Analyzing trace with hash -507884873, now seen corresponding path program 1 times [2022-03-18 00:16:35,989 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:35,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2120708599] [2022-03-18 00:16:35,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:35,989 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:35,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:35,993 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:35,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:35,996 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:35,996 INFO L85 PathProgramCache]: Analyzing trace with hash 1845596892, now seen corresponding path program 48 times [2022-03-18 00:16:35,996 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:35,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1153543253] [2022-03-18 00:16:35,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:35,996 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:36,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:36,352 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:36,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:36,365 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:36,366 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:36,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1153543253] [2022-03-18 00:16:36,366 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1153543253] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:36,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1489311492] [2022-03-18 00:16:36,366 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:16:36,366 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:36,366 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:36,367 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 00:16:36,368 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-03-18 00:16:36,670 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2022-03-18 00:16:36,670 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:36,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 57 conjunts are in the unsatisfiable core [2022-03-18 00:16:36,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:36,792 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:36,792 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:39,535 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:39,535 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1489311492] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:39,535 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:39,536 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 30] total 57 [2022-03-18 00:16:39,536 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:39,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1666562522] [2022-03-18 00:16:39,536 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1666562522] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:39,536 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:39,536 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-03-18 00:16:39,536 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874375270] [2022-03-18 00:16:39,536 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:39,536 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-03-18 00:16:39,536 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:39,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-03-18 00:16:39,538 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=811, Invalid=2381, Unknown=0, NotChecked=0, Total=3192 [2022-03-18 00:16:39,538 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand has 28 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 27 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:40,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:40,167 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2022-03-18 00:16:40,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-03-18 00:16:40,167 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 27 states have internal predecessors, (31), 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 35 [2022-03-18 00:16:40,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:40,168 INFO L225 Difference]: With dead ends: 42 [2022-03-18 00:16:40,168 INFO L226 Difference]: Without dead ends: 37 [2022-03-18 00:16:40,169 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 360 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1584, Invalid=5058, Unknown=0, NotChecked=0, Total=6642 [2022-03-18 00:16:40,169 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 632 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 683 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 632 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:40,169 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 43 Invalid, 683 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 632 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 00:16:40,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-03-18 00:16:40,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2022-03-18 00:16:40,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.03125) internal successors, (33), 32 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:40,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2022-03-18 00:16:40,172 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2022-03-18 00:16:40,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:40,173 INFO L478 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2022-03-18 00:16:40,173 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 27 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:40,173 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2022-03-18 00:16:40,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-18 00:16:40,173 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:40,173 INFO L500 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:40,178 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-03-18 00:16:40,373 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48,SelfDestructingSolverStorable49 [2022-03-18 00:16:40,374 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:40,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:40,374 INFO L85 PathProgramCache]: Analyzing trace with hash 1415390070, now seen corresponding path program 49 times [2022-03-18 00:16:40,374 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:40,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1140134956] [2022-03-18 00:16:40,395 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:40,396 INFO L85 PathProgramCache]: Analyzing trace with hash -448779529, now seen corresponding path program 1 times [2022-03-18 00:16:40,396 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:40,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1786833350] [2022-03-18 00:16:40,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:40,396 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:40,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:40,400 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:40,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:40,404 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:40,405 INFO L85 PathProgramCache]: Analyzing trace with hash 1415390070, now seen corresponding path program 50 times [2022-03-18 00:16:40,405 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:40,405 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1385327795] [2022-03-18 00:16:40,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:40,405 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:40,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:40,761 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:40,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:40,766 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:40,766 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:40,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1385327795] [2022-03-18 00:16:40,766 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1385327795] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:40,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [825971178] [2022-03-18 00:16:40,766 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:16:40,766 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:40,766 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:40,767 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 00:16:40,768 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-03-18 00:16:40,824 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:16:40,825 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:40,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 53 conjunts are in the unsatisfiable core [2022-03-18 00:16:40,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:40,942 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:40,942 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:44,014 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:44,014 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [825971178] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:44,014 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:44,014 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 56 [2022-03-18 00:16:44,014 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:44,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1140134956] [2022-03-18 00:16:44,015 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1140134956] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:44,015 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:44,015 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-03-18 00:16:44,015 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351635390] [2022-03-18 00:16:44,015 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:44,015 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-03-18 00:16:44,015 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:44,015 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-03-18 00:16:44,016 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=837, Invalid=2243, Unknown=0, NotChecked=0, Total=3080 [2022-03-18 00:16:44,016 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand has 29 states, 29 states have (on average 1.103448275862069) internal successors, (32), 28 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:44,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:44,643 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2022-03-18 00:16:44,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-03-18 00:16:44,644 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.103448275862069) internal successors, (32), 28 states have internal predecessors, (32), 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 36 [2022-03-18 00:16:44,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:44,644 INFO L225 Difference]: With dead ends: 43 [2022-03-18 00:16:44,644 INFO L226 Difference]: Without dead ends: 38 [2022-03-18 00:16:44,646 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 381 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=1667, Invalid=4975, Unknown=0, NotChecked=0, Total=6642 [2022-03-18 00:16:44,646 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 697 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 750 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 697 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:44,646 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 58 Invalid, 750 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 697 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 00:16:44,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-03-18 00:16:44,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-03-18 00:16:44,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.0303030303030303) internal successors, (34), 33 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:44,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2022-03-18 00:16:44,650 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2022-03-18 00:16:44,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:44,650 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2022-03-18 00:16:44,650 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.103448275862069) internal successors, (32), 28 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:44,650 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2022-03-18 00:16:44,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-18 00:16:44,650 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:44,650 INFO L500 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:44,705 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-03-18 00:16:44,863 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51 [2022-03-18 00:16:44,864 INFO L403 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:44,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:44,864 INFO L85 PathProgramCache]: Analyzing trace with hash 963880476, now seen corresponding path program 51 times [2022-03-18 00:16:44,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:44,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2090900501] [2022-03-18 00:16:44,885 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:44,886 INFO L85 PathProgramCache]: Analyzing trace with hash -389674185, now seen corresponding path program 1 times [2022-03-18 00:16:44,886 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:44,886 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [650657966] [2022-03-18 00:16:44,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:44,886 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:44,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:44,889 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:44,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:44,892 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:44,892 INFO L85 PathProgramCache]: Analyzing trace with hash 963880476, now seen corresponding path program 52 times [2022-03-18 00:16:44,892 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:44,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1105422168] [2022-03-18 00:16:44,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:44,892 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:44,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:45,279 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:45,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:45,287 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:45,287 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:45,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1105422168] [2022-03-18 00:16:45,287 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1105422168] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:45,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [171346175] [2022-03-18 00:16:45,287 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:16:45,287 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:45,288 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:45,288 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 00:16:45,289 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-03-18 00:16:45,353 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:16:45,353 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:45,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 55 conjunts are in the unsatisfiable core [2022-03-18 00:16:45,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:45,484 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:45,484 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:49,245 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:49,245 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [171346175] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:49,245 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:49,245 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 58 [2022-03-18 00:16:49,245 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:49,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2090900501] [2022-03-18 00:16:49,245 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2090900501] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:49,246 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:49,246 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-03-18 00:16:49,246 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449992617] [2022-03-18 00:16:49,246 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:49,246 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-03-18 00:16:49,246 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:49,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-03-18 00:16:49,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=896, Invalid=2410, Unknown=0, NotChecked=0, Total=3306 [2022-03-18 00:16:49,247 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand has 30 states, 30 states have (on average 1.1) internal successors, (33), 29 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:49,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:16:49,894 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2022-03-18 00:16:49,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-03-18 00:16:49,894 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.1) internal successors, (33), 29 states have internal predecessors, (33), 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 37 [2022-03-18 00:16:49,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:16:49,895 INFO L225 Difference]: With dead ends: 44 [2022-03-18 00:16:49,895 INFO L226 Difference]: Without dead ends: 39 [2022-03-18 00:16:49,899 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 409 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=1785, Invalid=5355, Unknown=0, NotChecked=0, Total=7140 [2022-03-18 00:16:49,899 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 714 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 769 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 714 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 00:16:49,900 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 23 Invalid, 769 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 714 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 00:16:49,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-03-18 00:16:49,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2022-03-18 00:16:49,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.0294117647058822) internal successors, (35), 34 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:49,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2022-03-18 00:16:49,903 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2022-03-18 00:16:49,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:16:49,903 INFO L478 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2022-03-18 00:16:49,903 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.1) internal successors, (33), 29 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:16:49,903 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2022-03-18 00:16:49,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-18 00:16:49,904 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:16:49,904 INFO L500 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:16:49,921 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2022-03-18 00:16:50,104 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52,SelfDestructingSolverStorable53 [2022-03-18 00:16:50,105 INFO L403 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:16:50,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:16:50,105 INFO L85 PathProgramCache]: Analyzing trace with hash -148015050, now seen corresponding path program 53 times [2022-03-18 00:16:50,105 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:50,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1006635215] [2022-03-18 00:16:50,127 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:16:50,127 INFO L85 PathProgramCache]: Analyzing trace with hash -330568841, now seen corresponding path program 1 times [2022-03-18 00:16:50,127 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:50,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [39048454] [2022-03-18 00:16:50,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:50,127 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:50,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:50,131 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:16:50,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:16:50,134 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:16:50,134 INFO L85 PathProgramCache]: Analyzing trace with hash -148015050, now seen corresponding path program 54 times [2022-03-18 00:16:50,134 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:16:50,134 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1851087333] [2022-03-18 00:16:50,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:16:50,134 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:16:50,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:50,548 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:16:50,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:16:50,551 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:50,551 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:16:50,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1851087333] [2022-03-18 00:16:50,551 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1851087333] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:16:50,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1067485670] [2022-03-18 00:16:50,551 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:16:50,551 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:16:50,551 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:16:50,552 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 00:16:50,553 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-03-18 00:16:51,184 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2022-03-18 00:16:51,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:16:51,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 59 conjunts are in the unsatisfiable core [2022-03-18 00:16:51,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:16:51,342 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:51,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:16:59,592 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:16:59,593 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1067485670] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:16:59,593 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:16:59,593 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 60 [2022-03-18 00:16:59,593 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:16:59,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1006635215] [2022-03-18 00:16:59,593 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1006635215] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:16:59,593 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:16:59,593 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-03-18 00:16:59,593 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100841769] [2022-03-18 00:16:59,593 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:16:59,593 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-03-18 00:16:59,593 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:16:59,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-03-18 00:16:59,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=957, Invalid=2583, Unknown=0, NotChecked=0, Total=3540 [2022-03-18 00:16:59,595 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand has 31 states, 31 states have (on average 1.096774193548387) internal successors, (34), 30 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:17:00,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:17:00,322 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2022-03-18 00:17:00,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-03-18 00:17:00,323 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.096774193548387) internal successors, (34), 30 states have internal predecessors, (34), 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 38 [2022-03-18 00:17:00,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:17:00,323 INFO L225 Difference]: With dead ends: 45 [2022-03-18 00:17:00,323 INFO L226 Difference]: Without dead ends: 40 [2022-03-18 00:17:00,324 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 438 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=1907, Invalid=5749, Unknown=0, NotChecked=0, Total=7656 [2022-03-18 00:17:00,324 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 803 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 860 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 803 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-18 00:17:00,324 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 58 Invalid, 860 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 803 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-18 00:17:00,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-03-18 00:17:00,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2022-03-18 00:17:00,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.0285714285714285) internal successors, (36), 35 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:17:00,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2022-03-18 00:17:00,327 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2022-03-18 00:17:00,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:17:00,327 INFO L478 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2022-03-18 00:17:00,327 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.096774193548387) internal successors, (34), 30 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:17:00,327 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2022-03-18 00:17:00,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-18 00:17:00,328 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:17:00,328 INFO L500 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:17:00,335 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2022-03-18 00:17:00,535 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,SelfDestructingSolverStorable55,28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:17:00,536 INFO L403 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:17:00,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:17:00,536 INFO L85 PathProgramCache]: Analyzing trace with hash -257037988, now seen corresponding path program 55 times [2022-03-18 00:17:00,536 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:17:00,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1101277063] [2022-03-18 00:17:00,558 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:17:00,558 INFO L85 PathProgramCache]: Analyzing trace with hash -271463497, now seen corresponding path program 1 times [2022-03-18 00:17:00,558 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:17:00,558 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [815639786] [2022-03-18 00:17:00,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:17:00,558 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:17:00,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:17:00,562 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:17:00,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:17:00,565 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:17:00,566 INFO L85 PathProgramCache]: Analyzing trace with hash -257037988, now seen corresponding path program 56 times [2022-03-18 00:17:00,566 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:17:00,566 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1282397972] [2022-03-18 00:17:00,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:17:00,566 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:17:00,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:17:01,024 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:17:01,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:17:01,027 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:17:01,028 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:17:01,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1282397972] [2022-03-18 00:17:01,028 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1282397972] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:17:01,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1424905817] [2022-03-18 00:17:01,028 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:17:01,028 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:17:01,028 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:17:01,029 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 00:17:01,030 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-03-18 00:17:01,072 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:17:01,072 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:17:01,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 59 conjunts are in the unsatisfiable core [2022-03-18 00:17:01,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:17:01,196 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:17:01,197 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:17:07,024 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:17:07,025 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1424905817] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:17:07,025 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:17:07,025 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 31] total 62 [2022-03-18 00:17:07,025 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:17:07,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1101277063] [2022-03-18 00:17:07,025 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1101277063] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:17:07,025 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:17:07,025 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-03-18 00:17:07,025 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256751620] [2022-03-18 00:17:07,025 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:17:07,026 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-03-18 00:17:07,026 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:17:07,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-03-18 00:17:07,027 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1020, Invalid=2762, Unknown=0, NotChecked=0, Total=3782 [2022-03-18 00:17:07,027 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand has 32 states, 32 states have (on average 1.09375) internal successors, (35), 31 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:17:07,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:17:07,799 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2022-03-18 00:17:07,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-03-18 00:17:07,800 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.09375) internal successors, (35), 31 states have internal predecessors, (35), 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 39 [2022-03-18 00:17:07,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:17:07,800 INFO L225 Difference]: With dead ends: 46 [2022-03-18 00:17:07,800 INFO L226 Difference]: Without dead ends: 41 [2022-03-18 00:17:07,801 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 468 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=2033, Invalid=6157, Unknown=0, NotChecked=0, Total=8190 [2022-03-18 00:17:07,801 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 939 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 998 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 939 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-18 00:17:07,802 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 138 Invalid, 998 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 939 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-18 00:17:07,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-03-18 00:17:07,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-03-18 00:17:07,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.0277777777777777) internal successors, (37), 36 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:17:07,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2022-03-18 00:17:07,805 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2022-03-18 00:17:07,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:17:07,805 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2022-03-18 00:17:07,805 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.09375) internal successors, (35), 31 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:17:07,805 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2022-03-18 00:17:07,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-03-18 00:17:07,805 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:17:07,805 INFO L500 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:17:07,823 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2022-03-18 00:17:08,023 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,SelfDestructingSolverStorable57,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:17:08,023 INFO L403 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:17:08,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:17:08,023 INFO L85 PathProgramCache]: Analyzing trace with hash 658218230, now seen corresponding path program 57 times [2022-03-18 00:17:08,024 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:17:08,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1072162475] [2022-03-18 00:17:08,045 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:17:08,045 INFO L85 PathProgramCache]: Analyzing trace with hash -212358153, now seen corresponding path program 1 times [2022-03-18 00:17:08,046 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:17:08,046 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [100769339] [2022-03-18 00:17:08,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:17:08,046 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:17:08,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:17:08,049 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:17:08,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:17:08,052 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:17:08,053 INFO L85 PathProgramCache]: Analyzing trace with hash 658218230, now seen corresponding path program 58 times [2022-03-18 00:17:08,053 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:17:08,053 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1102193974] [2022-03-18 00:17:08,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:17:08,053 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:17:08,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:17:08,535 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:17:08,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:17:08,547 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:17:08,547 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:17:08,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1102193974] [2022-03-18 00:17:08,547 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1102193974] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:17:08,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1871795538] [2022-03-18 00:17:08,548 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:17:08,548 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:17:08,548 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:17:08,549 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 00:17:08,550 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-03-18 00:17:08,624 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:17:08,625 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:17:08,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 61 conjunts are in the unsatisfiable core [2022-03-18 00:17:08,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:17:08,757 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:17:08,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:17:14,534 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:17:14,534 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1871795538] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:17:14,534 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:17:14,535 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 64 [2022-03-18 00:17:14,535 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:17:14,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1072162475] [2022-03-18 00:17:14,535 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1072162475] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:17:14,535 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:17:14,535 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-03-18 00:17:14,535 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5395374] [2022-03-18 00:17:14,535 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:17:14,535 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-03-18 00:17:14,535 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:17:14,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-03-18 00:17:14,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1085, Invalid=2947, Unknown=0, NotChecked=0, Total=4032 [2022-03-18 00:17:14,536 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand has 33 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 32 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:17:15,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:17:15,309 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2022-03-18 00:17:15,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-03-18 00:17:15,309 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 32 states have internal predecessors, (36), 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 40 [2022-03-18 00:17:15,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:17:15,310 INFO L225 Difference]: With dead ends: 47 [2022-03-18 00:17:15,310 INFO L226 Difference]: Without dead ends: 42 [2022-03-18 00:17:15,311 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 499 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=2163, Invalid=6579, Unknown=0, NotChecked=0, Total=8742 [2022-03-18 00:17:15,311 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 912 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 973 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 912 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-18 00:17:15,312 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 53 Invalid, 973 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 912 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-18 00:17:15,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-03-18 00:17:15,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2022-03-18 00:17:15,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 37 states have (on average 1.027027027027027) internal successors, (38), 37 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:17:15,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2022-03-18 00:17:15,314 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2022-03-18 00:17:15,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:17:15,314 INFO L478 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2022-03-18 00:17:15,315 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 32 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:17:15,315 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2022-03-18 00:17:15,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-18 00:17:15,315 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:17:15,315 INFO L500 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:17:15,332 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2022-03-18 00:17:15,521 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58,SelfDestructingSolverStorable59 [2022-03-18 00:17:15,522 INFO L403 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:17:15,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:17:15,522 INFO L85 PathProgramCache]: Analyzing trace with hash -1033610084, now seen corresponding path program 59 times [2022-03-18 00:17:15,522 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:17:15,522 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1019623217] [2022-03-18 00:17:15,543 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:17:15,544 INFO L85 PathProgramCache]: Analyzing trace with hash -153252809, now seen corresponding path program 1 times [2022-03-18 00:17:15,544 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:17:15,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1212884267] [2022-03-18 00:17:15,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:17:15,544 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:17:15,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:17:15,547 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:17:15,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:17:15,550 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:17:15,550 INFO L85 PathProgramCache]: Analyzing trace with hash -1033610084, now seen corresponding path program 60 times [2022-03-18 00:17:15,550 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:17:15,550 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724638551] [2022-03-18 00:17:15,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:17:15,551 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:17:15,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:17:16,017 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:17:16,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:17:16,020 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:17:16,020 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:17:16,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724638551] [2022-03-18 00:17:16,021 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1724638551] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:17:16,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [835524242] [2022-03-18 00:17:16,021 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:17:16,021 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:17:16,021 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:17:16,022 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 00:17:16,023 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-03-18 00:17:16,901 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 16 check-sat command(s) [2022-03-18 00:17:16,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:17:16,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 70 conjunts are in the unsatisfiable core [2022-03-18 00:17:16,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:17:17,046 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:17:17,047 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:17:28,515 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:17:28,515 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [835524242] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:17:28,516 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:17:28,516 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33, 36] total 69 [2022-03-18 00:17:28,516 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:17:28,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1019623217] [2022-03-18 00:17:28,516 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1019623217] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:17:28,516 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:17:28,516 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-03-18 00:17:28,516 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [264613728] [2022-03-18 00:17:28,516 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:17:28,516 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-03-18 00:17:28,516 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:17:28,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-03-18 00:17:28,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1189, Invalid=3503, Unknown=0, NotChecked=0, Total=4692 [2022-03-18 00:17:28,517 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand has 34 states, 34 states have (on average 1.088235294117647) internal successors, (37), 33 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:17:29,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:17:29,416 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2022-03-18 00:17:29,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-03-18 00:17:29,416 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.088235294117647) internal successors, (37), 33 states have internal predecessors, (37), 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 41 [2022-03-18 00:17:29,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:17:29,417 INFO L225 Difference]: With dead ends: 48 [2022-03-18 00:17:29,417 INFO L226 Difference]: Without dead ends: 43 [2022-03-18 00:17:29,418 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 537 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=2334, Invalid=7566, Unknown=0, NotChecked=0, Total=9900 [2022-03-18 00:17:29,418 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 1032 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 1095 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 1032 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-18 00:17:29,418 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 113 Invalid, 1095 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 1032 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-18 00:17:29,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-03-18 00:17:29,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2022-03-18 00:17:29,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0263157894736843) internal successors, (39), 38 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:17:29,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2022-03-18 00:17:29,421 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2022-03-18 00:17:29,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:17:29,421 INFO L478 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2022-03-18 00:17:29,422 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.088235294117647) internal successors, (37), 33 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:17:29,422 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2022-03-18 00:17:29,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-18 00:17:29,422 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:17:29,422 INFO L500 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:17:29,430 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-03-18 00:17:29,628 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable60,SelfDestructingSolverStorable61 [2022-03-18 00:17:29,629 INFO L403 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:17:29,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:17:29,629 INFO L85 PathProgramCache]: Analyzing trace with hash -1940680266, now seen corresponding path program 61 times [2022-03-18 00:17:29,629 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:17:29,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [231998390] [2022-03-18 00:17:29,655 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:17:29,655 INFO L85 PathProgramCache]: Analyzing trace with hash -94147465, now seen corresponding path program 1 times [2022-03-18 00:17:29,655 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:17:29,655 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [770750889] [2022-03-18 00:17:29,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:17:29,655 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:17:29,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:17:29,659 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:17:29,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:17:29,661 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:17:29,661 INFO L85 PathProgramCache]: Analyzing trace with hash -1940680266, now seen corresponding path program 62 times [2022-03-18 00:17:29,662 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:17:29,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [378923859] [2022-03-18 00:17:29,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:17:29,662 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:17:29,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:17:30,170 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:17:30,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:17:30,174 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:17:30,174 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:17:30,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [378923859] [2022-03-18 00:17:30,174 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [378923859] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:17:30,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1597623694] [2022-03-18 00:17:30,174 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:17:30,174 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:17:30,174 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:17:30,175 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 00:17:30,176 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-03-18 00:17:30,242 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:17:30,242 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:17:30,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 65 conjunts are in the unsatisfiable core [2022-03-18 00:17:30,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:17:30,383 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:17:30,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:17:41,984 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:17:41,984 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1597623694] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:17:41,984 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:17:41,984 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 68 [2022-03-18 00:17:41,984 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:17:41,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [231998390] [2022-03-18 00:17:41,984 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [231998390] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:17:41,984 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:17:41,985 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-03-18 00:17:41,985 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890586441] [2022-03-18 00:17:41,985 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:17:41,985 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-03-18 00:17:41,985 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:17:41,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-03-18 00:17:41,986 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1221, Invalid=3335, Unknown=0, NotChecked=0, Total=4556 [2022-03-18 00:17:41,986 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand has 35 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 34 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:17:42,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:17:42,951 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2022-03-18 00:17:42,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-03-18 00:17:42,951 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 34 states have internal predecessors, (38), 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 42 [2022-03-18 00:17:42,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:17:42,952 INFO L225 Difference]: With dead ends: 49 [2022-03-18 00:17:42,952 INFO L226 Difference]: Without dead ends: 44 [2022-03-18 00:17:42,953 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 564 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=2435, Invalid=7465, Unknown=0, NotChecked=0, Total=9900 [2022-03-18 00:17:42,953 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 1149 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 1214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 1149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-18 00:17:42,954 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 168 Invalid, 1214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 1149 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-18 00:17:42,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-03-18 00:17:42,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2022-03-18 00:17:42,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.0256410256410255) internal successors, (40), 39 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:17:42,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2022-03-18 00:17:42,956 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2022-03-18 00:17:42,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:17:42,957 INFO L478 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2022-03-18 00:17:42,957 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 34 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:17:42,957 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2022-03-18 00:17:42,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-03-18 00:17:42,957 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:17:42,957 INFO L500 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:17:42,974 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2022-03-18 00:17:43,166 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,SelfDestructingSolverStorable63,32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:17:43,167 INFO L403 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:17:43,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:17:43,167 INFO L85 PathProgramCache]: Analyzing trace with hash 4915164, now seen corresponding path program 63 times [2022-03-18 00:17:43,167 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:17:43,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [85006486] [2022-03-18 00:17:43,192 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:17:43,192 INFO L85 PathProgramCache]: Analyzing trace with hash -35042121, now seen corresponding path program 1 times [2022-03-18 00:17:43,193 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:17:43,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1668007334] [2022-03-18 00:17:43,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:17:43,193 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:17:43,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:17:43,196 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:17:43,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:17:43,198 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:17:43,199 INFO L85 PathProgramCache]: Analyzing trace with hash 4915164, now seen corresponding path program 64 times [2022-03-18 00:17:43,199 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:17:43,199 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2034291689] [2022-03-18 00:17:43,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:17:43,199 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:17:43,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:17:43,731 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:17:43,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:17:43,734 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:17:43,734 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:17:43,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2034291689] [2022-03-18 00:17:43,734 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2034291689] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:17:43,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1672277343] [2022-03-18 00:17:43,734 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:17:43,734 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:17:43,734 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:17:43,735 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 00:17:43,736 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-03-18 00:17:43,818 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:17:43,818 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:17:43,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 67 conjunts are in the unsatisfiable core [2022-03-18 00:17:43,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:17:43,957 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:17:43,958 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:18:00,816 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:18:00,816 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1672277343] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:18:00,816 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:18:00,816 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 70 [2022-03-18 00:18:00,816 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:18:00,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [85006486] [2022-03-18 00:18:00,816 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [85006486] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:18:00,816 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:18:00,816 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-03-18 00:18:00,816 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979601902] [2022-03-18 00:18:00,816 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:18:00,817 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-03-18 00:18:00,817 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:18:00,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-03-18 00:18:00,818 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1292, Invalid=3538, Unknown=0, NotChecked=0, Total=4830 [2022-03-18 00:18:00,818 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand has 36 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 35 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:18:01,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:18:01,687 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2022-03-18 00:18:01,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-03-18 00:18:01,687 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 35 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2022-03-18 00:18:01,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:18:01,687 INFO L225 Difference]: With dead ends: 50 [2022-03-18 00:18:01,687 INFO L226 Difference]: Without dead ends: 45 [2022-03-18 00:18:01,689 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 598 ImplicationChecksByTransitivity, 17.5s TimeCoverageRelationStatistics Valid=2577, Invalid=7929, Unknown=0, NotChecked=0, Total=10506 [2022-03-18 00:18:01,689 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 1108 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 1175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 1108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-18 00:18:01,689 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 63 Invalid, 1175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 1108 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-18 00:18:01,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-03-18 00:18:01,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2022-03-18 00:18:01,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.025) internal successors, (41), 40 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:18:01,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2022-03-18 00:18:01,692 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2022-03-18 00:18:01,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:18:01,692 INFO L478 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2022-03-18 00:18:01,692 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 35 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:18:01,692 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2022-03-18 00:18:01,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-18 00:18:01,692 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:18:01,692 INFO L500 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:18:01,709 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2022-03-18 00:18:01,902 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,SelfDestructingSolverStorable65,33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:18:01,902 INFO L403 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:18:01,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:18:01,902 INFO L85 PathProgramCache]: Analyzing trace with hash 188831350, now seen corresponding path program 65 times [2022-03-18 00:18:01,902 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:18:01,903 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [442239984] [2022-03-18 00:18:01,924 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:18:01,924 INFO L85 PathProgramCache]: Analyzing trace with hash 24063223, now seen corresponding path program 1 times [2022-03-18 00:18:01,924 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:18:01,924 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [270624746] [2022-03-18 00:18:01,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:18:01,924 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:18:01,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:18:01,927 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:18:01,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:18:01,930 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:18:01,930 INFO L85 PathProgramCache]: Analyzing trace with hash 188831350, now seen corresponding path program 66 times [2022-03-18 00:18:01,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:18:01,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2139659627] [2022-03-18 00:18:01,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:18:01,930 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:18:01,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:18:02,479 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:18:02,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:18:02,481 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:18:02,482 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:18:02,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2139659627] [2022-03-18 00:18:02,482 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2139659627] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:18:02,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [161789382] [2022-03-18 00:18:02,482 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:18:02,482 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:18:02,482 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:18:02,483 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 00:18:02,484 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-03-18 00:18:03,793 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 18 check-sat command(s) [2022-03-18 00:18:03,794 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:18:03,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 72 conjunts are in the unsatisfiable core [2022-03-18 00:18:03,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:18:03,931 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:18:03,931 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:18:14,931 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:18:14,931 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [161789382] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:18:14,931 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:18:14,931 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36, 39] total 75 [2022-03-18 00:18:14,931 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:18:14,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [442239984] [2022-03-18 00:18:14,931 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [442239984] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:18:14,931 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:18:14,931 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-03-18 00:18:14,931 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666215692] [2022-03-18 00:18:14,931 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:18:14,932 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-03-18 00:18:14,932 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:18:14,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-03-18 00:18:14,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1405, Invalid=4145, Unknown=0, NotChecked=0, Total=5550 [2022-03-18 00:18:14,933 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand has 37 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 36 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:18:15,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:18:15,922 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2022-03-18 00:18:15,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-03-18 00:18:15,922 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 36 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2022-03-18 00:18:15,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:18:15,922 INFO L225 Difference]: With dead ends: 51 [2022-03-18 00:18:15,922 INFO L226 Difference]: Without dead ends: 46 [2022-03-18 00:18:15,923 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 639 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=2763, Invalid=9009, Unknown=0, NotChecked=0, Total=11772 [2022-03-18 00:18:15,924 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 1169 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 1238 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 1169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-18 00:18:15,924 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 58 Invalid, 1238 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 1169 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-18 00:18:15,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-03-18 00:18:15,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2022-03-18 00:18:15,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.024390243902439) internal successors, (42), 41 states have internal predecessors, (42), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:18:15,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2022-03-18 00:18:15,926 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2022-03-18 00:18:15,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:18:15,926 INFO L478 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2022-03-18 00:18:15,927 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 36 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:18:15,927 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2022-03-18 00:18:15,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-03-18 00:18:15,927 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:18:15,927 INFO L500 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:18:15,934 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-03-18 00:18:16,132 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66,SelfDestructingSolverStorable67 [2022-03-18 00:18:16,132 INFO L403 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:18:16,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:18:16,132 INFO L85 PathProgramCache]: Analyzing trace with hash 1595265820, now seen corresponding path program 67 times [2022-03-18 00:18:16,132 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:18:16,132 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1375703775] [2022-03-18 00:18:16,153 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:18:16,153 INFO L85 PathProgramCache]: Analyzing trace with hash 83168567, now seen corresponding path program 1 times [2022-03-18 00:18:16,153 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:18:16,153 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1723569656] [2022-03-18 00:18:16,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:18:16,153 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:18:16,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:18:16,156 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:18:16,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:18:16,158 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:18:16,159 INFO L85 PathProgramCache]: Analyzing trace with hash 1595265820, now seen corresponding path program 68 times [2022-03-18 00:18:16,159 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:18:16,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1760797152] [2022-03-18 00:18:16,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:18:16,159 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:18:16,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:18:16,740 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:18:16,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:18:16,742 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:18:16,742 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:18:16,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1760797152] [2022-03-18 00:18:16,743 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1760797152] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:18:16,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1734116498] [2022-03-18 00:18:16,743 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:18:16,743 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:18:16,743 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:18:16,744 INFO L229 MonitoredProcess]: Starting monitored process 35 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 00:18:16,744 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-03-18 00:18:16,841 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:18:16,841 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:18:16,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 71 conjunts are in the unsatisfiable core [2022-03-18 00:18:16,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:18:16,984 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:18:16,985 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:18:44,873 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:18:44,874 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1734116498] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:18:44,874 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:18:44,874 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37, 37] total 74 [2022-03-18 00:18:44,874 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:18:44,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1375703775] [2022-03-18 00:18:44,874 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1375703775] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:18:44,874 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:18:44,874 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-03-18 00:18:44,874 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [679891094] [2022-03-18 00:18:44,874 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:18:44,875 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-03-18 00:18:44,875 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:18:44,875 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-03-18 00:18:44,875 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1440, Invalid=3962, Unknown=0, NotChecked=0, Total=5402 [2022-03-18 00:18:44,876 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand has 38 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 37 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:18:45,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:18:45,900 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2022-03-18 00:18:45,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-03-18 00:18:45,901 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 37 states have internal predecessors, (41), 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 45 [2022-03-18 00:18:45,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:18:45,901 INFO L225 Difference]: With dead ends: 52 [2022-03-18 00:18:45,901 INFO L226 Difference]: Without dead ends: 47 [2022-03-18 00:18:45,903 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 669 ImplicationChecksByTransitivity, 28.6s TimeCoverageRelationStatistics Valid=2873, Invalid=8899, Unknown=0, NotChecked=0, Total=11772 [2022-03-18 00:18:45,903 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 1217 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 1288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 1217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-18 00:18:45,903 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 38 Invalid, 1288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 1217 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-18 00:18:45,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-03-18 00:18:45,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-03-18 00:18:45,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0238095238095237) internal successors, (43), 42 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:18:45,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2022-03-18 00:18:45,906 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2022-03-18 00:18:45,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:18:45,906 INFO L478 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2022-03-18 00:18:45,906 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 37 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:18:45,906 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2022-03-18 00:18:45,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-18 00:18:45,907 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:18:45,907 INFO L500 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:18:45,924 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-03-18 00:18:46,124 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68,SelfDestructingSolverStorable69 [2022-03-18 00:18:46,124 INFO L403 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:18:46,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:18:46,124 INFO L85 PathProgramCache]: Analyzing trace with hash -2049905866, now seen corresponding path program 69 times [2022-03-18 00:18:46,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:18:46,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1077073178] [2022-03-18 00:18:46,155 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:18:46,156 INFO L85 PathProgramCache]: Analyzing trace with hash 142273911, now seen corresponding path program 1 times [2022-03-18 00:18:46,156 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:18:46,156 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [963037591] [2022-03-18 00:18:46,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:18:46,156 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:18:46,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:18:46,159 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:18:46,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:18:46,162 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:18:46,162 INFO L85 PathProgramCache]: Analyzing trace with hash -2049905866, now seen corresponding path program 70 times [2022-03-18 00:18:46,162 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:18:46,162 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [943853670] [2022-03-18 00:18:46,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:18:46,162 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:18:46,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:18:46,804 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:18:46,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:18:46,807 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:18:46,807 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:18:46,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [943853670] [2022-03-18 00:18:46,807 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [943853670] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:18:46,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1090742762] [2022-03-18 00:18:46,807 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:18:46,808 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:18:46,808 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:18:46,809 INFO L229 MonitoredProcess]: Starting monitored process 36 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 00:18:46,810 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-03-18 00:18:46,901 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:18:46,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:18:46,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 73 conjunts are in the unsatisfiable core [2022-03-18 00:18:46,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:18:47,044 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:18:47,045 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:19:21,657 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:19:21,657 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1090742762] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:19:21,657 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:19:21,658 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 76 [2022-03-18 00:19:21,658 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:19:21,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1077073178] [2022-03-18 00:19:21,658 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1077073178] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:19:21,658 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:19:21,658 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-03-18 00:19:21,658 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049416727] [2022-03-18 00:19:21,658 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:19:21,658 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-03-18 00:19:21,658 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:19:21,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-03-18 00:19:21,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1517, Invalid=4183, Unknown=0, NotChecked=0, Total=5700 [2022-03-18 00:19:21,659 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand has 39 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 38 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:19:22,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:19:22,717 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2022-03-18 00:19:22,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-03-18 00:19:22,718 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 38 states have internal predecessors, (42), 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 46 [2022-03-18 00:19:22,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:19:22,718 INFO L225 Difference]: With dead ends: 53 [2022-03-18 00:19:22,718 INFO L226 Difference]: Without dead ends: 48 [2022-03-18 00:19:22,720 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 706 ImplicationChecksByTransitivity, 35.2s TimeCoverageRelationStatistics Valid=3027, Invalid=9405, Unknown=0, NotChecked=0, Total=12432 [2022-03-18 00:19:22,720 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 1382 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 1455 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 1382 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-18 00:19:22,720 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 133 Invalid, 1455 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 1382 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-18 00:19:22,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-03-18 00:19:22,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2022-03-18 00:19:22,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 43 states have (on average 1.0232558139534884) internal successors, (44), 43 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:19:22,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2022-03-18 00:19:22,723 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2022-03-18 00:19:22,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:19:22,723 INFO L478 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2022-03-18 00:19:22,723 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 38 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:19:22,723 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2022-03-18 00:19:22,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-03-18 00:19:22,723 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:19:22,723 INFO L500 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:19:22,740 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-03-18 00:19:22,927 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,SelfDestructingSolverStorable71,36 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:19:22,928 INFO L403 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:19:22,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:19:22,928 INFO L85 PathProgramCache]: Analyzing trace with hash 913888860, now seen corresponding path program 71 times [2022-03-18 00:19:22,928 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:19:22,928 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1865535090] [2022-03-18 00:19:22,962 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:19:22,962 INFO L85 PathProgramCache]: Analyzing trace with hash 201379255, now seen corresponding path program 1 times [2022-03-18 00:19:22,962 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:19:22,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [333464886] [2022-03-18 00:19:22,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:19:22,962 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:19:22,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:19:22,965 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:19:22,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:19:22,968 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:19:22,968 INFO L85 PathProgramCache]: Analyzing trace with hash 913888860, now seen corresponding path program 72 times [2022-03-18 00:19:22,968 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:19:22,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2093030004] [2022-03-18 00:19:22,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:19:22,969 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:19:22,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:19:23,617 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:19:23,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:19:23,620 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:19:23,620 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:19:23,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2093030004] [2022-03-18 00:19:23,621 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2093030004] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:19:23,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [591685676] [2022-03-18 00:19:23,621 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:19:23,621 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:19:23,621 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:19:23,622 INFO L229 MonitoredProcess]: Starting monitored process 37 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 00:19:23,622 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-03-18 00:19:26,155 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2022-03-18 00:19:26,155 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:19:26,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 78 conjunts are in the unsatisfiable core [2022-03-18 00:19:26,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:19:26,305 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:19:26,305 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:20:05,044 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:20:05,044 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [591685676] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:20:05,044 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:20:05,044 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39, 42] total 81 [2022-03-18 00:20:05,044 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:20:05,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1865535090] [2022-03-18 00:20:05,044 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1865535090] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:20:05,044 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:20:05,045 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-03-18 00:20:05,045 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021667510] [2022-03-18 00:20:05,045 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:20:05,045 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-03-18 00:20:05,045 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:20:05,045 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-03-18 00:20:05,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1639, Invalid=4841, Unknown=0, NotChecked=0, Total=6480 [2022-03-18 00:20:05,046 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand has 40 states, 40 states have (on average 1.075) internal successors, (43), 39 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:20:06,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:20:06,265 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2022-03-18 00:20:06,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-03-18 00:20:06,265 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.075) internal successors, (43), 39 states have internal predecessors, (43), 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 47 [2022-03-18 00:20:06,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:20:06,266 INFO L225 Difference]: With dead ends: 54 [2022-03-18 00:20:06,266 INFO L226 Difference]: Without dead ends: 49 [2022-03-18 00:20:06,267 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 750 ImplicationChecksByTransitivity, 39.3s TimeCoverageRelationStatistics Valid=3228, Invalid=10578, Unknown=0, NotChecked=0, Total=13806 [2022-03-18 00:20:06,268 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 1389 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 1464 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 1389 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-18 00:20:06,268 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 68 Invalid, 1464 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 1389 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-18 00:20:06,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-03-18 00:20:06,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2022-03-18 00:20:06,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.0227272727272727) internal successors, (45), 44 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:20:06,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2022-03-18 00:20:06,271 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2022-03-18 00:20:06,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:20:06,271 INFO L478 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2022-03-18 00:20:06,271 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.075) internal successors, (43), 39 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:20:06,271 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2022-03-18 00:20:06,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-03-18 00:20:06,272 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:20:06,272 INFO L500 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:20:06,277 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2022-03-18 00:20:06,473 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,SelfDestructingSolverStorable73,37 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:20:06,473 INFO L403 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:20:06,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:20:06,474 INFO L85 PathProgramCache]: Analyzing trace with hash -1697755146, now seen corresponding path program 73 times [2022-03-18 00:20:06,474 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:20:06,474 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1586047296] [2022-03-18 00:20:06,498 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:20:06,498 INFO L85 PathProgramCache]: Analyzing trace with hash 260484599, now seen corresponding path program 1 times [2022-03-18 00:20:06,498 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:20:06,498 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1537738605] [2022-03-18 00:20:06,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:20:06,498 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:20:06,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:20:06,501 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:20:06,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:20:06,504 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:20:06,504 INFO L85 PathProgramCache]: Analyzing trace with hash -1697755146, now seen corresponding path program 74 times [2022-03-18 00:20:06,504 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:20:06,504 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [161355565] [2022-03-18 00:20:06,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:20:06,504 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:20:06,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:20:07,203 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:20:07,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:20:07,206 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:20:07,206 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:20:07,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [161355565] [2022-03-18 00:20:07,206 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [161355565] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:20:07,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1540233808] [2022-03-18 00:20:07,206 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:20:07,206 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:20:07,206 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:20:07,207 INFO L229 MonitoredProcess]: Starting monitored process 38 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 00:20:07,208 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-03-18 00:20:07,288 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:20:07,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:20:07,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 77 conjunts are in the unsatisfiable core [2022-03-18 00:20:07,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:20:07,444 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:20:07,444 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:21:01,576 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:21:01,576 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1540233808] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:21:01,576 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:21:01,576 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40, 40] total 80 [2022-03-18 00:21:01,577 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:21:01,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1586047296] [2022-03-18 00:21:01,577 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1586047296] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:21:01,577 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:21:01,577 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-03-18 00:21:01,577 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1119142142] [2022-03-18 00:21:01,577 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:21:01,577 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-03-18 00:21:01,577 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:21:01,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-03-18 00:21:01,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1677, Invalid=4643, Unknown=0, NotChecked=0, Total=6320 [2022-03-18 00:21:01,578 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand has 41 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 40 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:21:02,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:21:02,795 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2022-03-18 00:21:02,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-03-18 00:21:02,795 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 40 states have internal predecessors, (44), 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 48 [2022-03-18 00:21:02,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:21:02,795 INFO L225 Difference]: With dead ends: 55 [2022-03-18 00:21:02,795 INFO L226 Difference]: Without dead ends: 50 [2022-03-18 00:21:02,797 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 783 ImplicationChecksByTransitivity, 54.6s TimeCoverageRelationStatistics Valid=3347, Invalid=10459, Unknown=0, NotChecked=0, Total=13806 [2022-03-18 00:21:02,797 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 1588 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 1665 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 1588 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-18 00:21:02,797 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 193 Invalid, 1665 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 1588 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-18 00:21:02,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-03-18 00:21:02,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-03-18 00:21:02,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.0222222222222221) internal successors, (46), 45 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:21:02,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2022-03-18 00:21:02,800 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2022-03-18 00:21:02,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:21:02,800 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2022-03-18 00:21:02,800 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 40 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:21:02,800 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2022-03-18 00:21:02,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-03-18 00:21:02,800 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:21:02,800 INFO L500 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:21:02,819 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-03-18 00:21:03,015 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74,SelfDestructingSolverStorable75,38 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:21:03,015 INFO L403 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:21:03,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:21:03,016 INFO L85 PathProgramCache]: Analyzing trace with hash -1054340708, now seen corresponding path program 75 times [2022-03-18 00:21:03,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:21:03,016 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1113546395] [2022-03-18 00:21:03,037 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:21:03,037 INFO L85 PathProgramCache]: Analyzing trace with hash 319589943, now seen corresponding path program 1 times [2022-03-18 00:21:03,037 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:21:03,037 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [545864859] [2022-03-18 00:21:03,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:21:03,037 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:21:03,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:21:03,040 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:21:03,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:21:03,043 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:21:03,043 INFO L85 PathProgramCache]: Analyzing trace with hash -1054340708, now seen corresponding path program 76 times [2022-03-18 00:21:03,043 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:21:03,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1426068723] [2022-03-18 00:21:03,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:21:03,043 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:21:03,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:21:03,777 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:21:03,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:21:03,800 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:21:03,800 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:21:03,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1426068723] [2022-03-18 00:21:03,801 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1426068723] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:21:03,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [436846851] [2022-03-18 00:21:03,801 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:21:03,801 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:21:03,801 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:21:03,802 INFO L229 MonitoredProcess]: Starting monitored process 39 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 00:21:03,803 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-03-18 00:21:03,875 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:21:03,875 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:21:03,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 79 conjunts are in the unsatisfiable core [2022-03-18 00:21:03,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:21:04,028 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:21:04,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:22:24,410 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:22:24,410 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [436846851] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:22:24,410 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:22:24,410 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 82 [2022-03-18 00:22:24,410 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:22:24,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1113546395] [2022-03-18 00:22:24,410 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1113546395] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:22:24,411 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:22:24,411 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2022-03-18 00:22:24,411 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1270201663] [2022-03-18 00:22:24,411 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:22:24,411 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-03-18 00:22:24,411 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:22:24,411 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-03-18 00:22:24,411 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1760, Invalid=4882, Unknown=0, NotChecked=0, Total=6642 [2022-03-18 00:22:24,412 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand has 42 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 41 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:22:25,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:22:25,583 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2022-03-18 00:22:25,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-03-18 00:22:25,583 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 41 states have internal predecessors, (45), 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 49 [2022-03-18 00:22:25,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:22:25,583 INFO L225 Difference]: With dead ends: 56 [2022-03-18 00:22:25,583 INFO L226 Difference]: Without dead ends: 51 [2022-03-18 00:22:25,585 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 823 ImplicationChecksByTransitivity, 80.4s TimeCoverageRelationStatistics Valid=3513, Invalid=11007, Unknown=0, NotChecked=0, Total=14520 [2022-03-18 00:22:25,585 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 1604 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 1683 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 1604 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-18 00:22:25,585 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 133 Invalid, 1683 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 1604 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-18 00:22:25,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-03-18 00:22:25,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-03-18 00:22:25,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.0217391304347827) internal successors, (47), 46 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:22:25,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2022-03-18 00:22:25,588 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2022-03-18 00:22:25,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:22:25,588 INFO L478 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2022-03-18 00:22:25,588 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 41 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:22:25,588 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2022-03-18 00:22:25,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-03-18 00:22:25,588 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:22:25,588 INFO L500 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:22:25,606 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-03-18 00:22:25,798 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable76,SelfDestructingSolverStorable77 [2022-03-18 00:22:25,799 INFO L403 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:22:25,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:22:25,799 INFO L85 PathProgramCache]: Analyzing trace with hash 1711637686, now seen corresponding path program 77 times [2022-03-18 00:22:25,799 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:22:25,799 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [983944360] [2022-03-18 00:22:25,821 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:22:25,822 INFO L85 PathProgramCache]: Analyzing trace with hash 378695287, now seen corresponding path program 1 times [2022-03-18 00:22:25,822 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:22:25,822 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [243101020] [2022-03-18 00:22:25,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:22:25,822 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:22:25,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:22:25,825 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:22:25,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:22:25,827 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:22:25,827 INFO L85 PathProgramCache]: Analyzing trace with hash 1711637686, now seen corresponding path program 78 times [2022-03-18 00:22:25,827 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:22:25,827 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [497019639] [2022-03-18 00:22:25,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:22:25,827 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:22:25,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:22:26,565 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:22:26,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:22:26,568 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:22:26,568 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:22:26,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [497019639] [2022-03-18 00:22:26,568 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [497019639] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:22:26,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2139387463] [2022-03-18 00:22:26,568 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:22:26,568 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:22:26,568 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:22:26,569 INFO L229 MonitoredProcess]: Starting monitored process 40 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 00:22:26,570 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-03-18 00:22:30,912 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 21 check-sat command(s) [2022-03-18 00:22:30,912 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:22:30,919 WARN L261 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 87 conjunts are in the unsatisfiable core [2022-03-18 00:22:30,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:22:31,077 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:22:31,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:23:27,924 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:23:27,924 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2139387463] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:23:27,924 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:23:27,924 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 45] total 87 [2022-03-18 00:23:27,924 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:23:27,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [983944360] [2022-03-18 00:23:27,924 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [983944360] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:23:27,924 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:23:27,924 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2022-03-18 00:23:27,924 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011028281] [2022-03-18 00:23:27,925 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:23:27,925 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-03-18 00:23:27,925 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:23:27,925 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-03-18 00:23:27,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1891, Invalid=5591, Unknown=0, NotChecked=0, Total=7482 [2022-03-18 00:23:27,926 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand has 43 states, 43 states have (on average 1.069767441860465) internal successors, (46), 42 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:23:29,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:23:29,365 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2022-03-18 00:23:29,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-03-18 00:23:29,366 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.069767441860465) internal successors, (46), 42 states have internal predecessors, (46), 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 50 [2022-03-18 00:23:29,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:23:29,366 INFO L225 Difference]: With dead ends: 57 [2022-03-18 00:23:29,366 INFO L226 Difference]: Without dead ends: 52 [2022-03-18 00:23:29,367 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 870 ImplicationChecksByTransitivity, 57.2s TimeCoverageRelationStatistics Valid=3729, Invalid=12273, Unknown=0, NotChecked=0, Total=16002 [2022-03-18 00:23:29,367 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 1692 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 1773 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 1692 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-18 00:23:29,368 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 143 Invalid, 1773 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 1692 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-18 00:23:29,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-03-18 00:23:29,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2022-03-18 00:23:29,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.0212765957446808) internal successors, (48), 47 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:23:29,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2022-03-18 00:23:29,371 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2022-03-18 00:23:29,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:23:29,371 INFO L478 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2022-03-18 00:23:29,371 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.069767441860465) internal successors, (46), 42 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:23:29,371 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2022-03-18 00:23:29,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-03-18 00:23:29,371 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:23:29,371 INFO L500 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:23:29,377 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2022-03-18 00:23:29,575 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable78,SelfDestructingSolverStorable79 [2022-03-18 00:23:29,576 INFO L403 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:23:29,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:23:29,576 INFO L85 PathProgramCache]: Analyzing trace with hash 1557621980, now seen corresponding path program 79 times [2022-03-18 00:23:29,576 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:23:29,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [195632900] [2022-03-18 00:23:29,597 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:23:29,597 INFO L85 PathProgramCache]: Analyzing trace with hash 437800631, now seen corresponding path program 1 times [2022-03-18 00:23:29,597 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:23:29,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [424254657] [2022-03-18 00:23:29,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:23:29,597 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:23:29,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:23:29,600 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:23:29,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:23:29,603 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:23:29,603 INFO L85 PathProgramCache]: Analyzing trace with hash 1557621980, now seen corresponding path program 80 times [2022-03-18 00:23:29,603 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:23:29,603 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [341564726] [2022-03-18 00:23:29,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:23:29,603 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:23:29,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:23:30,355 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:23:30,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:23:30,357 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:23:30,357 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:23:30,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [341564726] [2022-03-18 00:23:30,357 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [341564726] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:23:30,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1190562222] [2022-03-18 00:23:30,357 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:23:30,357 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:23:30,358 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:23:30,358 INFO L229 MonitoredProcess]: Starting monitored process 41 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 00:23:30,359 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-03-18 00:23:30,395 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:23:30,395 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:23:30,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 83 conjunts are in the unsatisfiable core [2022-03-18 00:23:30,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:23:30,568 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:23:30,568 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:25:16,498 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:25:16,499 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1190562222] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:25:16,499 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:25:16,499 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43, 43] total 86 [2022-03-18 00:25:16,499 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:25:16,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [195632900] [2022-03-18 00:25:16,499 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [195632900] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:25:16,499 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:25:16,499 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2022-03-18 00:25:16,499 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053365582] [2022-03-18 00:25:16,499 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:25:16,499 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-03-18 00:25:16,499 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:25:16,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-03-18 00:25:16,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1932, Invalid=5378, Unknown=0, NotChecked=0, Total=7310 [2022-03-18 00:25:16,501 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand has 44 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 43 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:25:17,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:25:17,873 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2022-03-18 00:25:17,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-03-18 00:25:17,873 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 43 states have internal predecessors, (47), 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 51 [2022-03-18 00:25:17,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:25:17,873 INFO L225 Difference]: With dead ends: 58 [2022-03-18 00:25:17,873 INFO L226 Difference]: Without dead ends: 53 [2022-03-18 00:25:17,874 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 906 ImplicationChecksByTransitivity, 105.9s TimeCoverageRelationStatistics Valid=3857, Invalid=12145, Unknown=0, NotChecked=0, Total=16002 [2022-03-18 00:25:17,875 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 1717 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 1800 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 1717 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-18 00:25:17,875 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 88 Invalid, 1800 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 1717 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-18 00:25:17,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-03-18 00:25:17,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2022-03-18 00:25:17,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0208333333333333) internal successors, (49), 48 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:25:17,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2022-03-18 00:25:17,878 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2022-03-18 00:25:17,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:25:17,878 INFO L478 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2022-03-18 00:25:17,878 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 43 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:25:17,878 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2022-03-18 00:25:17,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-03-18 00:25:17,878 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:25:17,878 INFO L500 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:25:17,895 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-03-18 00:25:18,087 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80,41 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable81 [2022-03-18 00:25:18,087 INFO L403 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:25:18,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:25:18,088 INFO L85 PathProgramCache]: Analyzing trace with hash 1078102390, now seen corresponding path program 81 times [2022-03-18 00:25:18,088 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:25:18,088 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2080929556] [2022-03-18 00:25:18,109 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:25:18,109 INFO L85 PathProgramCache]: Analyzing trace with hash 496905975, now seen corresponding path program 1 times [2022-03-18 00:25:18,109 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:25:18,109 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [709472201] [2022-03-18 00:25:18,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:25:18,110 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:25:18,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:25:18,112 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:25:18,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:25:18,115 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:25:18,115 INFO L85 PathProgramCache]: Analyzing trace with hash 1078102390, now seen corresponding path program 82 times [2022-03-18 00:25:18,115 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:25:18,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1021493312] [2022-03-18 00:25:18,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:25:18,115 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:25:18,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:25:18,929 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:25:18,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:25:18,941 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:25:18,941 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:25:18,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1021493312] [2022-03-18 00:25:18,941 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1021493312] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:25:18,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [942017250] [2022-03-18 00:25:18,941 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:25:18,941 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:25:18,941 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:25:18,942 INFO L229 MonitoredProcess]: Starting monitored process 42 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 00:25:18,945 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-03-18 00:25:19,015 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:25:19,016 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:25:19,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 85 conjunts are in the unsatisfiable core [2022-03-18 00:25:19,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:25:19,180 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:25:19,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:27:50,380 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:27:50,380 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [942017250] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:27:50,380 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:27:50,380 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44, 44] total 88 [2022-03-18 00:27:50,380 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:27:50,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2080929556] [2022-03-18 00:27:50,381 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2080929556] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:27:50,381 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:27:50,381 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2022-03-18 00:27:50,381 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523730391] [2022-03-18 00:27:50,381 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:27:50,381 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-03-18 00:27:50,381 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:27:50,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-03-18 00:27:50,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2021, Invalid=5635, Unknown=0, NotChecked=0, Total=7656 [2022-03-18 00:27:50,382 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand has 45 states, 45 states have (on average 1.0666666666666667) internal successors, (48), 44 states have internal predecessors, (48), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:27:51,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:27:51,693 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2022-03-18 00:27:51,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-03-18 00:27:51,693 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.0666666666666667) internal successors, (48), 44 states have internal predecessors, (48), 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 52 [2022-03-18 00:27:51,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:27:51,694 INFO L225 Difference]: With dead ends: 59 [2022-03-18 00:27:51,694 INFO L226 Difference]: Without dead ends: 54 [2022-03-18 00:27:51,695 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 949 ImplicationChecksByTransitivity, 150.6s TimeCoverageRelationStatistics Valid=4035, Invalid=12735, Unknown=0, NotChecked=0, Total=16770 [2022-03-18 00:27:51,698 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 1774 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 1859 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 1774 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-18 00:27:51,698 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 63 Invalid, 1859 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 1774 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-18 00:27:51,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-03-18 00:27:51,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2022-03-18 00:27:51,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 49 states have (on average 1.0204081632653061) internal successors, (50), 49 states have internal predecessors, (50), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:27:51,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2022-03-18 00:27:51,701 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2022-03-18 00:27:51,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:27:51,701 INFO L478 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2022-03-18 00:27:51,701 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.0666666666666667) internal successors, (48), 44 states have internal predecessors, (48), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:27:51,701 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2022-03-18 00:27:51,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-03-18 00:27:51,715 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:27:51,715 INFO L500 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:27:51,731 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-03-18 00:27:51,918 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82,SelfDestructingSolverStorable83,42 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:27:51,918 INFO L403 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:27:51,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:27:51,918 INFO L85 PathProgramCache]: Analyzing trace with hash -902103012, now seen corresponding path program 83 times [2022-03-18 00:27:51,918 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:27:51,918 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [376866084] [2022-03-18 00:27:51,939 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:27:51,939 INFO L85 PathProgramCache]: Analyzing trace with hash 556011319, now seen corresponding path program 1 times [2022-03-18 00:27:51,939 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:27:51,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1839576382] [2022-03-18 00:27:51,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:27:51,939 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:27:51,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:27:51,951 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:27:51,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:27:51,955 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:27:51,955 INFO L85 PathProgramCache]: Analyzing trace with hash -902103012, now seen corresponding path program 84 times [2022-03-18 00:27:51,955 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:27:51,955 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1124579224] [2022-03-18 00:27:51,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:27:51,955 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:27:51,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:27:52,848 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:27:52,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:27:52,851 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:27:52,851 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:27:52,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1124579224] [2022-03-18 00:27:52,851 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1124579224] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:27:52,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1219094575] [2022-03-18 00:27:52,851 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:27:52,853 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:27:52,853 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:27:52,854 INFO L229 MonitoredProcess]: Starting monitored process 43 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 00:27:52,854 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-03-18 00:27:55,776 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 22 check-sat command(s) [2022-03-18 00:27:55,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:27:55,782 WARN L261 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 90 conjunts are in the unsatisfiable core [2022-03-18 00:27:55,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:27:55,961 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:27:55,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:29:15,217 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:29:15,218 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1219094575] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:29:15,218 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:29:15,218 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45, 48] total 93 [2022-03-18 00:29:15,218 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:29:15,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [376866084] [2022-03-18 00:29:15,218 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [376866084] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:29:15,218 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:29:15,218 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2022-03-18 00:29:15,218 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471928682] [2022-03-18 00:29:15,218 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:29:15,218 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-03-18 00:29:15,218 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:29:15,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-03-18 00:29:15,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2161, Invalid=6395, Unknown=0, NotChecked=0, Total=8556 [2022-03-18 00:29:15,219 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand has 46 states, 46 states have (on average 1.065217391304348) internal successors, (49), 45 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:29:16,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:29:16,776 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2022-03-18 00:29:16,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-03-18 00:29:16,776 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.065217391304348) internal successors, (49), 45 states have internal predecessors, (49), 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 53 [2022-03-18 00:29:16,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:29:16,777 INFO L225 Difference]: With dead ends: 60 [2022-03-18 00:29:16,777 INFO L226 Difference]: Without dead ends: 55 [2022-03-18 00:29:16,778 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 999 ImplicationChecksByTransitivity, 79.7s TimeCoverageRelationStatistics Valid=4266, Invalid=14094, Unknown=0, NotChecked=0, Total=18360 [2022-03-18 00:29:16,778 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 1868 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 1955 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 1868 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-18 00:29:16,778 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 73 Invalid, 1955 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 1868 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-18 00:29:16,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-03-18 00:29:16,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-03-18 00:29:16,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.02) internal successors, (51), 50 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:29:16,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2022-03-18 00:29:16,781 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2022-03-18 00:29:16,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:29:16,781 INFO L478 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2022-03-18 00:29:16,781 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.065217391304348) internal successors, (49), 45 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:29:16,781 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2022-03-18 00:29:16,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-03-18 00:29:16,781 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:29:16,781 INFO L500 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:29:16,789 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2022-03-18 00:29:16,986 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84,SelfDestructingSolverStorable85,43 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:29:16,987 INFO L403 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:29:16,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:29:16,987 INFO L85 PathProgramCache]: Analyzing trace with hash 2136038966, now seen corresponding path program 85 times [2022-03-18 00:29:16,987 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:29:16,987 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1367929373] [2022-03-18 00:29:17,009 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:29:17,009 INFO L85 PathProgramCache]: Analyzing trace with hash 615116663, now seen corresponding path program 1 times [2022-03-18 00:29:17,009 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:29:17,009 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [433833946] [2022-03-18 00:29:17,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:29:17,009 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:29:17,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:29:17,012 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:29:17,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:29:17,022 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:29:17,022 INFO L85 PathProgramCache]: Analyzing trace with hash 2136038966, now seen corresponding path program 86 times [2022-03-18 00:29:17,022 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:29:17,022 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [149756900] [2022-03-18 00:29:17,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:29:17,022 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:29:17,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:29:17,880 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:29:17,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:29:17,892 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:29:17,892 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:29:17,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [149756900] [2022-03-18 00:29:17,892 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [149756900] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:29:17,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [398784708] [2022-03-18 00:29:17,892 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:29:17,892 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:29:17,893 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:29:17,893 INFO L229 MonitoredProcess]: Starting monitored process 44 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 00:29:17,894 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-03-18 00:29:17,951 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:29:17,951 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:29:17,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 89 conjunts are in the unsatisfiable core [2022-03-18 00:29:17,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:29:18,122 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:29:18,122 INFO L328 TraceCheckSpWp]: Computing backward predicates...