/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/loops-crafted-1/in-de31.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 18:45:34,579 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 18:45:34,580 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 18:45:34,598 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 18:45:34,621 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 18:45:34,621 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 18:45:34,629 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 18:45:34,630 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-20 18:45:34,639 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 18:45:34,639 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 18:45:34,641 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 18:45:34,641 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 18:45:34,641 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 18:45:34,641 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 18:45:34,641 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 18:45:34,641 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 18:45:34,641 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 18:45:34,642 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 18:45:34,642 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 18:45:34,642 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 18:45:34,642 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 18:45:34,642 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 18:45:34,643 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 18:45:34,643 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 18:45:34,643 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 18:45:34,643 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 18:45:34,643 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 18:45:34,643 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 18:45:34,643 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 18:45:34,643 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-20 18:45:34,643 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 18:45:34,847 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 18:45:34,862 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 18:45:34,864 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 18:45:34,864 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 18:45:34,865 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 18:45:34,866 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/in-de31.c [2022-03-20 18:45:34,922 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e39b09636/c0393761d7fe43fba842420970b8b05c/FLAGac40094d9 [2022-03-20 18:45:35,271 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 18:45:35,272 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de31.c [2022-03-20 18:45:35,276 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e39b09636/c0393761d7fe43fba842420970b8b05c/FLAGac40094d9 [2022-03-20 18:45:35,289 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e39b09636/c0393761d7fe43fba842420970b8b05c [2022-03-20 18:45:35,291 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 18:45:35,292 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 18:45:35,293 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 18:45:35,293 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 18:45:35,296 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 18:45:35,297 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 06:45:35" (1/1) ... [2022-03-20 18:45:35,298 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@430b7c0c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:45:35, skipping insertion in model container [2022-03-20 18:45:35,298 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 06:45:35" (1/1) ... [2022-03-20 18:45:35,303 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 18:45:35,320 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 18:45:35,455 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de31.c[368,381] [2022-03-20 18:45:35,471 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 18:45:35,477 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 18:45:35,484 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de31.c[368,381] [2022-03-20 18:45:35,488 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 18:45:35,497 INFO L208 MainTranslator]: Completed translation [2022-03-20 18:45:35,498 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:45:35 WrapperNode [2022-03-20 18:45:35,498 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 18:45:35,500 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 18:45:35,500 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 18:45:35,500 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 18:45:35,508 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:45:35" (1/1) ... [2022-03-20 18:45:35,508 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:45:35" (1/1) ... [2022-03-20 18:45:35,512 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:45:35" (1/1) ... [2022-03-20 18:45:35,513 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:45:35" (1/1) ... [2022-03-20 18:45:35,523 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:45:35" (1/1) ... [2022-03-20 18:45:35,526 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:45:35" (1/1) ... [2022-03-20 18:45:35,531 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:45:35" (1/1) ... [2022-03-20 18:45:35,535 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 18:45:35,535 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 18:45:35,536 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 18:45:35,536 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 18:45:35,536 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:45:35" (1/1) ... [2022-03-20 18:45:35,541 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 18:45:35,548 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:35,558 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-20 18:45:35,580 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-20 18:45:35,593 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 18:45:35,593 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 18:45:35,593 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 18:45:35,593 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 18:45:35,593 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 18:45:35,594 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 18:45:35,594 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 18:45:35,594 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 18:45:35,594 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 18:45:35,594 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-03-20 18:45:35,594 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 18:45:35,594 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 18:45:35,594 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 18:45:35,594 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 18:45:35,595 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 18:45:35,595 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 18:45:35,596 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 18:45:35,596 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 18:45:35,647 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 18:45:35,648 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 18:45:35,771 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 18:45:35,775 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 18:45:35,775 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2022-03-20 18:45:35,776 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 06:45:35 BoogieIcfgContainer [2022-03-20 18:45:35,776 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 18:45:35,777 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 18:45:35,777 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 18:45:35,780 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 18:45:35,780 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 06:45:35" (1/3) ... [2022-03-20 18:45:35,780 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73cdcefc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 06:45:35, skipping insertion in model container [2022-03-20 18:45:35,780 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:45:35" (2/3) ... [2022-03-20 18:45:35,781 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73cdcefc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 06:45:35, skipping insertion in model container [2022-03-20 18:45:35,781 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 06:45:35" (3/3) ... [2022-03-20 18:45:35,799 INFO L111 eAbstractionObserver]: Analyzing ICFG in-de31.c [2022-03-20 18:45:35,803 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 18:45:35,803 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 18:45:35,846 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 18:45:35,852 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-20 18:45:35,852 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 18:45:35,863 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-20 18:45:35,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-03-20 18:45:35,878 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:35,879 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:35,880 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:35,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:35,886 INFO L85 PathProgramCache]: Analyzing trace with hash 1792812365, now seen corresponding path program 1 times [2022-03-20 18:45:35,895 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:35,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [533264330] [2022-03-20 18:45:35,904 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:45:35,905 INFO L85 PathProgramCache]: Analyzing trace with hash 1792812365, now seen corresponding path program 2 times [2022-03-20 18:45:35,907 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:35,907 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [278647363] [2022-03-20 18:45:35,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:35,908 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:36,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:36,203 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:36,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:36,212 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:36,213 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:36,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [278647363] [2022-03-20 18:45:36,213 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [278647363] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:36,213 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:36,214 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:45:36,215 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:36,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [533264330] [2022-03-20 18:45:36,216 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [533264330] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:36,216 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:36,216 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:45:36,216 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665654465] [2022-03-20 18:45:36,216 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:36,219 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:45:36,219 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:36,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:45:36,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-03-20 18:45:36,244 INFO L87 Difference]: Start difference. First operand has 22 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 8 states, 8 states have (on average 1.25) 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) [2022-03-20 18:45:36,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:36,508 INFO L93 Difference]: Finished difference Result 49 states and 68 transitions. [2022-03-20 18:45:36,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 18:45:36,510 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.25) 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 [2022-03-20 18:45:36,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:36,514 INFO L225 Difference]: With dead ends: 49 [2022-03-20 18:45:36,514 INFO L226 Difference]: Without dead ends: 16 [2022-03-20 18:45:36,517 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2022-03-20 18:45:36,520 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 43 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:36,522 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 49 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:45:36,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-03-20 18:45:36,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-03-20 18:45:36,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 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) [2022-03-20 18:45:36,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2022-03-20 18:45:36,548 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 14 [2022-03-20 18:45:36,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:36,549 INFO L478 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2022-03-20 18:45:36,549 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.25) 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) [2022-03-20 18:45:36,549 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2022-03-20 18:45:36,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-20 18:45:36,550 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:36,550 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:36,550 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 18:45:36,550 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:36,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:36,551 INFO L85 PathProgramCache]: Analyzing trace with hash 595464366, now seen corresponding path program 1 times [2022-03-20 18:45:36,551 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:36,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1645289514] [2022-03-20 18:45:39,323 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:39,325 INFO L85 PathProgramCache]: Analyzing trace with hash -1152508211, now seen corresponding path program 1 times [2022-03-20 18:45:39,325 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:39,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [275306609] [2022-03-20 18:45:39,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:39,326 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:39,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:39,638 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:39,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:39,660 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:39,660 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:39,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [275306609] [2022-03-20 18:45:39,661 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [275306609] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:39,661 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:39,661 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 18:45:39,769 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:39,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1645289514] [2022-03-20 18:45:39,770 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1645289514] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:39,770 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:39,770 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 18:45:39,770 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811392320] [2022-03-20 18:45:39,770 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:39,771 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 18:45:39,771 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:39,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 18:45:39,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2022-03-20 18:45:39,772 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 11 states, 10 states have (on average 1.1) internal successors, (11), 9 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) [2022-03-20 18:45:40,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:40,203 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2022-03-20 18:45:40,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 18:45:40,203 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.1) internal successors, (11), 9 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 [2022-03-20 18:45:40,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:40,204 INFO L225 Difference]: With dead ends: 25 [2022-03-20 18:45:40,204 INFO L226 Difference]: Without dead ends: 19 [2022-03-20 18:45:40,205 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=107, Invalid=399, Unknown=0, NotChecked=0, Total=506 [2022-03-20 18:45:40,207 INFO L913 BasicCegarLoop]: 10 mSDtfsCounter, 26 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:40,207 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 47 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:45:40,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-03-20 18:45:40,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2022-03-20 18:45:40,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 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) [2022-03-20 18:45:40,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2022-03-20 18:45:40,225 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 15 [2022-03-20 18:45:40,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:40,225 INFO L478 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2022-03-20 18:45:40,226 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.1) internal successors, (11), 9 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) [2022-03-20 18:45:40,226 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2022-03-20 18:45:40,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-03-20 18:45:40,227 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:40,227 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:40,227 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-20 18:45:40,227 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:40,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:40,228 INFO L85 PathProgramCache]: Analyzing trace with hash 1314021247, now seen corresponding path program 1 times [2022-03-20 18:45:40,228 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:40,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [341893125] [2022-03-20 18:45:41,203 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:41,204 INFO L85 PathProgramCache]: Analyzing trace with hash -1046489728, now seen corresponding path program 1 times [2022-03-20 18:45:41,204 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:41,204 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1154041229] [2022-03-20 18:45:41,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:41,204 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:41,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:41,275 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:41,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:41,279 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:41,280 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:41,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1154041229] [2022-03-20 18:45:41,280 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1154041229] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:41,280 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:41,280 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 18:45:41,300 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:41,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [341893125] [2022-03-20 18:45:41,300 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [341893125] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:41,300 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:41,300 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:45:41,300 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467384916] [2022-03-20 18:45:41,300 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:41,301 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 18:45:41,301 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:41,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 18:45:41,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-03-20 18:45:41,301 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 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) [2022-03-20 18:45:41,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:41,345 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2022-03-20 18:45:41,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 18:45:41,345 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 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 [2022-03-20 18:45:41,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:41,345 INFO L225 Difference]: With dead ends: 25 [2022-03-20 18:45:41,345 INFO L226 Difference]: Without dead ends: 18 [2022-03-20 18:45:41,346 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-03-20 18:45:41,346 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 16 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:41,347 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 26 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:45:41,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-03-20 18:45:41,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-03-20 18:45:41,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 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) [2022-03-20 18:45:41,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2022-03-20 18:45:41,354 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 16 [2022-03-20 18:45:41,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:41,354 INFO L478 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2022-03-20 18:45:41,356 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 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) [2022-03-20 18:45:41,356 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2022-03-20 18:45:41,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-20 18:45:41,357 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:41,357 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:41,357 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-20 18:45:41,358 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:41,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:41,358 INFO L85 PathProgramCache]: Analyzing trace with hash -1642511809, now seen corresponding path program 1 times [2022-03-20 18:45:41,358 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:41,359 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1590343876] [2022-03-20 18:45:41,487 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:41,487 INFO L85 PathProgramCache]: Analyzing trace with hash -1495870434, now seen corresponding path program 1 times [2022-03-20 18:45:41,487 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:41,488 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1600197473] [2022-03-20 18:45:41,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:41,488 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:41,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:41,768 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:41,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:41,775 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:41,775 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:41,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1600197473] [2022-03-20 18:45:41,775 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1600197473] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:45:41,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1994302521] [2022-03-20 18:45:41,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:41,775 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:41,776 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:41,777 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) [2022-03-20 18:45:41,794 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-20 18:45:41,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:41,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 17 conjunts are in the unsatisfiable core [2022-03-20 18:45:41,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:45:42,353 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:42,353 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:45:44,048 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:44,048 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1994302521] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:45:44,048 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:45:44,048 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 26 [2022-03-20 18:45:44,143 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:44,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1590343876] [2022-03-20 18:45:44,144 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1590343876] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:44,144 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:44,144 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 18:45:44,144 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272548720] [2022-03-20 18:45:44,144 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:44,144 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 18:45:44,144 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:44,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 18:45:44,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=644, Unknown=0, NotChecked=0, Total=756 [2022-03-20 18:45:44,145 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 12 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 10 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) [2022-03-20 18:45:44,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:44,738 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2022-03-20 18:45:44,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 18:45:44,738 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 10 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 [2022-03-20 18:45:44,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:44,738 INFO L225 Difference]: With dead ends: 26 [2022-03-20 18:45:44,739 INFO L226 Difference]: Without dead ends: 21 [2022-03-20 18:45:44,739 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 309 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=196, Invalid=1136, Unknown=0, NotChecked=0, Total=1332 [2022-03-20 18:45:44,740 INFO L913 BasicCegarLoop]: 10 mSDtfsCounter, 19 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:44,740 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 52 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:45:44,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-03-20 18:45:44,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2022-03-20 18:45:44,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 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) [2022-03-20 18:45:44,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2022-03-20 18:45:44,744 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 17 [2022-03-20 18:45:44,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:44,744 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2022-03-20 18:45:44,744 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 10 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) [2022-03-20 18:45:44,745 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2022-03-20 18:45:44,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-20 18:45:44,745 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:44,745 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:44,762 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-20 18:45:44,955 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:44,955 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:44,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:44,956 INFO L85 PathProgramCache]: Analyzing trace with hash 656236558, now seen corresponding path program 2 times [2022-03-20 18:45:44,956 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:44,956 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1352527211] [2022-03-20 18:45:45,078 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:45,079 INFO L85 PathProgramCache]: Analyzing trace with hash 1866381903, now seen corresponding path program 1 times [2022-03-20 18:45:45,079 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:45,079 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [531930732] [2022-03-20 18:45:45,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:45,079 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:45,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:45,142 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:45,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:45,151 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:45,151 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:45,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [531930732] [2022-03-20 18:45:45,152 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [531930732] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:45:45,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [907955019] [2022-03-20 18:45:45,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:45,152 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:45,152 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:45,153 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) [2022-03-20 18:45:45,153 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-20 18:45:45,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:45,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-20 18:45:45,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:45:45,240 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:45,241 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:45:45,321 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:45,321 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [907955019] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:45:45,321 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:45:45,321 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 10 [2022-03-20 18:45:45,339 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:45,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1352527211] [2022-03-20 18:45:45,339 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1352527211] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:45,339 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:45,339 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:45:45,339 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504198591] [2022-03-20 18:45:45,339 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:45,340 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:45:45,340 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:45,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:45:45,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-03-20 18:45:45,340 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 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) [2022-03-20 18:45:45,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:45,450 INFO L93 Difference]: Finished difference Result 27 states and 30 transitions. [2022-03-20 18:45:45,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 18:45:45,451 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 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 [2022-03-20 18:45:45,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:45,452 INFO L225 Difference]: With dead ends: 27 [2022-03-20 18:45:45,452 INFO L226 Difference]: Without dead ends: 19 [2022-03-20 18:45:45,452 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 38 SyntacticMatches, 5 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2022-03-20 18:45:45,453 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 14 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:45,453 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 39 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:45:45,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-03-20 18:45:45,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-03-20 18:45:45,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 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) [2022-03-20 18:45:45,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2022-03-20 18:45:45,459 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 18 [2022-03-20 18:45:45,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:45,459 INFO L478 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2022-03-20 18:45:45,459 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 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) [2022-03-20 18:45:45,459 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2022-03-20 18:45:45,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-20 18:45:45,460 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:45,460 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:45,477 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-20 18:45:45,676 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:45,677 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:45,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:45,677 INFO L85 PathProgramCache]: Analyzing trace with hash 1194243967, now seen corresponding path program 3 times [2022-03-20 18:45:45,677 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:45,677 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [479796264] [2022-03-20 18:45:45,823 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:45,824 INFO L85 PathProgramCache]: Analyzing trace with hash -931347968, now seen corresponding path program 1 times [2022-03-20 18:45:45,824 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:45,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1892458384] [2022-03-20 18:45:45,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:45,824 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:45,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:45,871 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:45,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:45,877 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:45,878 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:45,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1892458384] [2022-03-20 18:45:45,878 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1892458384] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:45:45,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1482920558] [2022-03-20 18:45:45,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:45,878 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:45,878 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:45,879 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) [2022-03-20 18:45:45,880 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-20 18:45:45,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:45,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-20 18:45:45,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:45:45,954 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:45,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:45:46,031 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:46,031 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1482920558] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:45:46,032 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:45:46,032 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 9 [2022-03-20 18:45:46,047 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:46,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [479796264] [2022-03-20 18:45:46,047 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [479796264] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:46,047 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:46,047 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:45:46,047 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276681788] [2022-03-20 18:45:46,047 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:46,047 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:45:46,048 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:46,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:45:46,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-03-20 18:45:46,048 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 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) [2022-03-20 18:45:46,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:46,178 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2022-03-20 18:45:46,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 18:45:46,178 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 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 [2022-03-20 18:45:46,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:46,179 INFO L225 Difference]: With dead ends: 25 [2022-03-20 18:45:46,179 INFO L226 Difference]: Without dead ends: 20 [2022-03-20 18:45:46,179 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 37 SyntacticMatches, 6 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=58, Invalid=182, Unknown=0, NotChecked=0, Total=240 [2022-03-20 18:45:46,179 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 15 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:46,180 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 41 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:45:46,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-03-20 18:45:46,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-03-20 18:45:46,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.2) internal successors, (18), 15 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) [2022-03-20 18:45:46,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2022-03-20 18:45:46,184 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2022-03-20 18:45:46,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:46,184 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2022-03-20 18:45:46,184 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 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) [2022-03-20 18:45:46,184 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2022-03-20 18:45:46,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-20 18:45:46,184 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:46,184 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:46,201 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-20 18:45:46,385 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:46,385 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:46,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:46,385 INFO L85 PathProgramCache]: Analyzing trace with hash -1598647602, now seen corresponding path program 4 times [2022-03-20 18:45:46,385 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:46,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1420945991] [2022-03-20 18:45:46,517 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:46,517 INFO L85 PathProgramCache]: Analyzing trace with hash 898838573, now seen corresponding path program 1 times [2022-03-20 18:45:46,518 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:46,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [970998614] [2022-03-20 18:45:46,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:46,518 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:46,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:46,760 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:46,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:46,767 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:46,767 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:46,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [970998614] [2022-03-20 18:45:46,767 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [970998614] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:45:46,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [438278190] [2022-03-20 18:45:46,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:46,768 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:46,768 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:46,769 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) [2022-03-20 18:45:46,770 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-20 18:45:46,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:46,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-20 18:45:46,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:45:47,393 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:47,394 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:45:48,730 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:48,731 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [438278190] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:45:48,731 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:45:48,731 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 32 [2022-03-20 18:45:48,854 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:48,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1420945991] [2022-03-20 18:45:48,854 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1420945991] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:48,855 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:48,855 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 18:45:48,855 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [816192585] [2022-03-20 18:45:48,855 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:48,855 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 18:45:48,855 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:48,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 18:45:48,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=954, Unknown=0, NotChecked=0, Total=1122 [2022-03-20 18:45:48,856 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 14 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 12 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) [2022-03-20 18:45:49,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:49,367 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2022-03-20 18:45:49,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 18:45:49,368 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 12 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 [2022-03-20 18:45:49,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:49,368 INFO L225 Difference]: With dead ends: 29 [2022-03-20 18:45:49,368 INFO L226 Difference]: Without dead ends: 24 [2022-03-20 18:45:49,369 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 546 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=273, Invalid=1707, Unknown=0, NotChecked=0, Total=1980 [2022-03-20 18:45:49,369 INFO L913 BasicCegarLoop]: 10 mSDtfsCounter, 18 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 172 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:49,370 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 62 Invalid, 186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 172 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:45:49,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-03-20 18:45:49,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22. [2022-03-20 18:45:49,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 17 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) [2022-03-20 18:45:49,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2022-03-20 18:45:49,386 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 19 [2022-03-20 18:45:49,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:49,386 INFO L478 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2022-03-20 18:45:49,386 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 12 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) [2022-03-20 18:45:49,386 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2022-03-20 18:45:49,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-20 18:45:49,386 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:49,386 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:49,403 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-20 18:45:49,602 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:49,603 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:49,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:49,603 INFO L85 PathProgramCache]: Analyzing trace with hash 2016026975, now seen corresponding path program 5 times [2022-03-20 18:45:49,603 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:49,603 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [511501951] [2022-03-20 18:45:49,725 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:49,725 INFO L85 PathProgramCache]: Analyzing trace with hash 530763808, now seen corresponding path program 1 times [2022-03-20 18:45:49,725 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:49,725 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [887614872] [2022-03-20 18:45:49,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:49,725 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:49,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:49,824 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:49,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:49,844 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:49,845 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:49,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [887614872] [2022-03-20 18:45:49,845 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [887614872] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:45:49,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [924522729] [2022-03-20 18:45:49,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:49,845 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:49,845 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:49,846 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) [2022-03-20 18:45:49,847 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-20 18:45:49,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:49,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-20 18:45:49,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:45:49,941 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:49,942 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:45:50,060 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:50,061 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [924522729] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:45:50,061 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:45:50,061 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 13 [2022-03-20 18:45:50,080 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:50,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [511501951] [2022-03-20 18:45:50,080 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [511501951] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:50,080 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:50,081 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 18:45:50,081 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [371538654] [2022-03-20 18:45:50,081 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:50,081 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 18:45:50,081 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:50,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 18:45:50,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-03-20 18:45:50,082 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand has 10 states, 10 states have (on average 1.6) internal successors, (16), 9 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) [2022-03-20 18:45:50,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:50,301 INFO L93 Difference]: Finished difference Result 39 states and 45 transitions. [2022-03-20 18:45:50,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 18:45:50,301 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.6) internal successors, (16), 9 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 [2022-03-20 18:45:50,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:50,301 INFO L225 Difference]: With dead ends: 39 [2022-03-20 18:45:50,301 INFO L226 Difference]: Without dead ends: 22 [2022-03-20 18:45:50,302 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 41 SyntacticMatches, 6 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=103, Invalid=449, Unknown=0, NotChecked=0, Total=552 [2022-03-20 18:45:50,302 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 20 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:50,302 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 48 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:45:50,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-03-20 18:45:50,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-03-20 18:45:50,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 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) [2022-03-20 18:45:50,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2022-03-20 18:45:50,307 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 20 [2022-03-20 18:45:50,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:50,307 INFO L478 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2022-03-20 18:45:50,307 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.6) internal successors, (16), 9 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) [2022-03-20 18:45:50,307 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2022-03-20 18:45:50,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-20 18:45:50,308 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:50,308 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:50,326 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-20 18:45:50,511 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:50,511 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:50,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:50,512 INFO L85 PathProgramCache]: Analyzing trace with hash -1178216785, now seen corresponding path program 6 times [2022-03-20 18:45:50,512 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:50,512 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [78047231] [2022-03-20 18:45:50,623 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:50,623 INFO L85 PathProgramCache]: Analyzing trace with hash -1568798961, now seen corresponding path program 1 times [2022-03-20 18:45:50,623 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:50,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [861219725] [2022-03-20 18:45:50,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:50,624 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:50,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:50,704 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:50,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:50,719 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:50,719 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:50,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [861219725] [2022-03-20 18:45:50,719 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [861219725] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:45:50,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1828527063] [2022-03-20 18:45:50,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:50,720 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:50,720 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:50,721 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) [2022-03-20 18:45:50,722 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-20 18:45:50,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:50,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-20 18:45:50,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:45:50,805 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:50,805 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:45:50,895 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:50,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1828527063] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:45:50,895 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:45:50,895 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 12 [2022-03-20 18:45:50,928 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:50,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [78047231] [2022-03-20 18:45:50,928 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [78047231] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:50,928 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:50,928 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 18:45:50,928 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572282275] [2022-03-20 18:45:50,928 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:50,929 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 18:45:50,929 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:50,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 18:45:50,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2022-03-20 18:45:50,929 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 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) [2022-03-20 18:45:51,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:51,151 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2022-03-20 18:45:51,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 18:45:51,152 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 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 [2022-03-20 18:45:51,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:51,154 INFO L225 Difference]: With dead ends: 28 [2022-03-20 18:45:51,154 INFO L226 Difference]: Without dead ends: 23 [2022-03-20 18:45:51,154 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 40 SyntacticMatches, 6 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=100, Invalid=406, Unknown=0, NotChecked=0, Total=506 [2022-03-20 18:45:51,156 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 17 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:51,156 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 56 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:45:51,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-20 18:45:51,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-03-20 18:45:51,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 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) [2022-03-20 18:45:51,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2022-03-20 18:45:51,163 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 21 [2022-03-20 18:45:51,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:51,163 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2022-03-20 18:45:51,163 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 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) [2022-03-20 18:45:51,163 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2022-03-20 18:45:51,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-20 18:45:51,164 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:51,164 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:51,180 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-20 18:45:51,375 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:51,375 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:51,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:51,376 INFO L85 PathProgramCache]: Analyzing trace with hash -2130486882, now seen corresponding path program 7 times [2022-03-20 18:45:51,376 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:51,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2010248074] [2022-03-20 18:45:51,487 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:51,487 INFO L85 PathProgramCache]: Analyzing trace with hash 650353918, now seen corresponding path program 1 times [2022-03-20 18:45:51,487 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:51,487 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213840322] [2022-03-20 18:45:51,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:51,487 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:51,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:51,735 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:51,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:51,752 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:51,752 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:51,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213840322] [2022-03-20 18:45:51,752 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [213840322] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:45:51,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1983134991] [2022-03-20 18:45:51,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:51,752 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:51,752 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:51,753 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) [2022-03-20 18:45:51,754 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-20 18:45:51,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:51,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-20 18:45:51,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:45:52,380 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:52,380 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:45:55,086 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:55,086 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1983134991] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:45:55,086 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:45:55,086 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15, 15] total 35 [2022-03-20 18:45:55,370 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:55,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2010248074] [2022-03-20 18:45:55,371 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2010248074] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:55,371 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:55,371 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 18:45:55,371 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637858221] [2022-03-20 18:45:55,371 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:55,371 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 18:45:55,371 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:55,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 18:45:55,372 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=1245, Unknown=0, NotChecked=0, Total=1406 [2022-03-20 18:45:55,372 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 14 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 12 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:56,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:56,183 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2022-03-20 18:45:56,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 18:45:56,183 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 12 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2022-03-20 18:45:56,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:56,184 INFO L225 Difference]: With dead ends: 33 [2022-03-20 18:45:56,184 INFO L226 Difference]: Without dead ends: 28 [2022-03-20 18:45:56,185 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 22 SyntacticMatches, 3 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 587 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=266, Invalid=2184, Unknown=0, NotChecked=0, Total=2450 [2022-03-20 18:45:56,185 INFO L913 BasicCegarLoop]: 10 mSDtfsCounter, 17 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 229 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:56,185 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 67 Invalid, 229 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:45:56,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-03-20 18:45:56,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 25. [2022-03-20 18:45:56,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.2) internal successors, (24), 20 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) [2022-03-20 18:45:56,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2022-03-20 18:45:56,190 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 22 [2022-03-20 18:45:56,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:56,190 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2022-03-20 18:45:56,190 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 12 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:56,191 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2022-03-20 18:45:56,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-20 18:45:56,191 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:56,191 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:56,196 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-03-20 18:45:56,395 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:56,395 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:56,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:56,396 INFO L85 PathProgramCache]: Analyzing trace with hash -1586088817, now seen corresponding path program 8 times [2022-03-20 18:45:56,396 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:56,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1728838708] [2022-03-20 18:45:56,513 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:56,513 INFO L85 PathProgramCache]: Analyzing trace with hash 714665327, now seen corresponding path program 1 times [2022-03-20 18:45:56,513 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:56,513 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [515356305] [2022-03-20 18:45:56,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:56,513 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:56,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:56,608 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:56,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:56,616 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:56,616 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:56,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [515356305] [2022-03-20 18:45:56,616 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [515356305] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:45:56,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [207616775] [2022-03-20 18:45:56,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:56,617 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:56,617 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:56,618 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) [2022-03-20 18:45:56,618 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-20 18:45:56,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:56,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-20 18:45:56,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:45:56,725 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:56,725 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:45:56,878 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:56,878 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [207616775] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:45:56,878 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:45:56,879 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 16 [2022-03-20 18:45:56,926 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:56,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1728838708] [2022-03-20 18:45:56,927 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1728838708] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:56,927 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:56,927 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 18:45:56,927 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904485877] [2022-03-20 18:45:56,927 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:56,927 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 18:45:56,927 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:56,927 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 18:45:56,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2022-03-20 18:45:56,928 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 12 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) [2022-03-20 18:45:57,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:57,314 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2022-03-20 18:45:57,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-20 18:45:57,315 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 12 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 [2022-03-20 18:45:57,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:57,315 INFO L225 Difference]: With dead ends: 45 [2022-03-20 18:45:57,315 INFO L226 Difference]: Without dead ends: 25 [2022-03-20 18:45:57,316 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 45 SyntacticMatches, 5 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=149, Invalid=843, Unknown=0, NotChecked=0, Total=992 [2022-03-20 18:45:57,316 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 24 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 193 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:57,316 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 58 Invalid, 193 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 169 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:45:57,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-03-20 18:45:57,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-03-20 18:45:57,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.15) internal successors, (23), 20 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) [2022-03-20 18:45:57,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2022-03-20 18:45:57,324 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 23 [2022-03-20 18:45:57,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:57,324 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2022-03-20 18:45:57,324 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 12 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) [2022-03-20 18:45:57,324 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2022-03-20 18:45:57,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-20 18:45:57,326 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:57,326 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:57,342 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-20 18:45:57,526 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-03-20 18:45:57,527 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:57,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:57,527 INFO L85 PathProgramCache]: Analyzing trace with hash 1773782399, now seen corresponding path program 9 times [2022-03-20 18:45:57,527 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:57,527 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [380606047] [2022-03-20 18:45:57,635 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:57,636 INFO L85 PathProgramCache]: Analyzing trace with hash 42777824, now seen corresponding path program 1 times [2022-03-20 18:45:57,636 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:57,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1893370345] [2022-03-20 18:45:57,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:57,636 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:57,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:57,751 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:57,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:57,757 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:57,757 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:57,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1893370345] [2022-03-20 18:45:57,757 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1893370345] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:45:57,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1379369666] [2022-03-20 18:45:57,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:57,757 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:57,757 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:57,760 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) [2022-03-20 18:45:57,761 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-20 18:45:57,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:57,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-20 18:45:57,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:45:57,855 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:57,855 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:45:57,997 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:57,997 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1379369666] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:45:57,997 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:45:57,997 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 15 [2022-03-20 18:45:58,084 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:58,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [380606047] [2022-03-20 18:45:58,084 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [380606047] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:58,084 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:58,084 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 18:45:58,084 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893239185] [2022-03-20 18:45:58,084 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:58,084 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 18:45:58,084 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:58,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 18:45:58,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=262, Unknown=0, NotChecked=0, Total=306 [2022-03-20 18:45:58,085 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 14 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 13 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) [2022-03-20 18:45:58,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:58,546 INFO L93 Difference]: Finished difference Result 31 states and 33 transitions. [2022-03-20 18:45:58,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 18:45:58,546 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 13 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 [2022-03-20 18:45:58,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:58,546 INFO L225 Difference]: With dead ends: 31 [2022-03-20 18:45:58,547 INFO L226 Difference]: Without dead ends: 26 [2022-03-20 18:45:58,547 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 43 SyntacticMatches, 6 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=152, Invalid=718, Unknown=0, NotChecked=0, Total=870 [2022-03-20 18:45:58,548 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 23 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:58,548 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 61 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:45:58,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-03-20 18:45:58,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-03-20 18:45:58,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 21 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) [2022-03-20 18:45:58,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2022-03-20 18:45:58,554 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 24 [2022-03-20 18:45:58,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:58,554 INFO L478 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2022-03-20 18:45:58,554 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 13 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) [2022-03-20 18:45:58,554 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2022-03-20 18:45:58,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-20 18:45:58,554 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:58,554 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:58,571 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-20 18:45:58,766 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:58,766 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:58,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:58,767 INFO L85 PathProgramCache]: Analyzing trace with hash -812825394, now seen corresponding path program 10 times [2022-03-20 18:45:58,767 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:58,767 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1676550792] [2022-03-20 18:45:58,886 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:58,887 INFO L85 PathProgramCache]: Analyzing trace with hash -1248808627, now seen corresponding path program 1 times [2022-03-20 18:45:58,887 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:58,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [837896318] [2022-03-20 18:45:58,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:58,887 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:58,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:59,462 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:59,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:59,468 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:59,468 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:59,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [837896318] [2022-03-20 18:45:59,468 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [837896318] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:45:59,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [562373150] [2022-03-20 18:45:59,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:59,469 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:59,469 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:59,470 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) [2022-03-20 18:45:59,473 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-20 18:45:59,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:59,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 38 conjunts are in the unsatisfiable core [2022-03-20 18:45:59,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:00,659 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:00,659 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:02,824 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:02,824 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [562373150] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:46:02,824 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:46:02,824 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 46 [2022-03-20 18:46:03,727 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:03,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1676550792] [2022-03-20 18:46:03,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1676550792] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:03,728 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:03,728 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-20 18:46:03,728 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800669406] [2022-03-20 18:46:03,728 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:03,728 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-20 18:46:03,728 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:03,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-20 18:46:03,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=2097, Unknown=0, NotChecked=0, Total=2450 [2022-03-20 18:46:03,729 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand has 20 states, 20 states have (on average 1.05) internal successors, (21), 18 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) [2022-03-20 18:46:06,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:06,049 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2022-03-20 18:46:06,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-20 18:46:06,049 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.05) internal successors, (21), 18 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 [2022-03-20 18:46:06,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:06,049 INFO L225 Difference]: With dead ends: 37 [2022-03-20 18:46:06,049 INFO L226 Difference]: Without dead ends: 32 [2022-03-20 18:46:06,050 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1183 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=547, Invalid=3875, Unknown=0, NotChecked=0, Total=4422 [2022-03-20 18:46:06,051 INFO L913 BasicCegarLoop]: 10 mSDtfsCounter, 20 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 324 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 324 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:06,051 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 82 Invalid, 340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 324 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 18:46:06,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-03-20 18:46:06,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 28. [2022-03-20 18:46:06,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.173913043478261) internal successors, (27), 23 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) [2022-03-20 18:46:06,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2022-03-20 18:46:06,058 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 25 [2022-03-20 18:46:06,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:06,058 INFO L478 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2022-03-20 18:46:06,058 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.05) internal successors, (21), 18 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) [2022-03-20 18:46:06,058 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2022-03-20 18:46:06,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-03-20 18:46:06,058 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:06,058 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:06,064 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-20 18:46:06,262 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-03-20 18:46:06,262 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:06,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:06,263 INFO L85 PathProgramCache]: Analyzing trace with hash 606711647, now seen corresponding path program 11 times [2022-03-20 18:46:06,263 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:06,263 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1948310028] [2022-03-20 18:46:06,369 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:06,369 INFO L85 PathProgramCache]: Analyzing trace with hash 688608000, now seen corresponding path program 1 times [2022-03-20 18:46:06,369 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:06,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1037053279] [2022-03-20 18:46:06,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:06,369 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:06,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:06,509 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:06,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:06,512 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:06,512 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:06,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1037053279] [2022-03-20 18:46:06,512 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1037053279] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:06,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1764208096] [2022-03-20 18:46:06,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:06,512 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:06,512 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:06,513 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) [2022-03-20 18:46:06,514 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-20 18:46:06,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:06,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-20 18:46:06,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:06,630 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:06,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:06,835 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:06,835 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1764208096] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:46:06,835 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:46:06,835 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 19 [2022-03-20 18:46:06,937 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:06,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1948310028] [2022-03-20 18:46:06,937 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1948310028] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:06,937 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:06,937 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 18:46:06,937 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167747042] [2022-03-20 18:46:06,937 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:06,938 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 18:46:06,938 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:06,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 18:46:06,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2022-03-20 18:46:06,938 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 16 states, 16 states have (on average 1.375) internal successors, (22), 15 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) [2022-03-20 18:46:07,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:07,623 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2022-03-20 18:46:07,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-03-20 18:46:07,624 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.375) internal successors, (22), 15 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 [2022-03-20 18:46:07,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:07,624 INFO L225 Difference]: With dead ends: 51 [2022-03-20 18:46:07,624 INFO L226 Difference]: Without dead ends: 28 [2022-03-20 18:46:07,625 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 47 SyntacticMatches, 6 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 199 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=205, Invalid=1355, Unknown=0, NotChecked=0, Total=1560 [2022-03-20 18:46:07,625 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 28 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 239 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 239 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:07,625 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 68 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 239 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:46:07,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-03-20 18:46:07,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-03-20 18:46:07,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 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) [2022-03-20 18:46:07,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2022-03-20 18:46:07,632 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 26 [2022-03-20 18:46:07,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:07,632 INFO L478 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2022-03-20 18:46:07,632 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.375) internal successors, (22), 15 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) [2022-03-20 18:46:07,632 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2022-03-20 18:46:07,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-20 18:46:07,632 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:07,632 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:07,648 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-03-20 18:46:07,834 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-03-20 18:46:07,834 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:07,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:07,835 INFO L85 PathProgramCache]: Analyzing trace with hash 1542928431, now seen corresponding path program 12 times [2022-03-20 18:46:07,835 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:07,835 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1352139847] [2022-03-20 18:46:07,916 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:07,916 INFO L85 PathProgramCache]: Analyzing trace with hash 361855535, now seen corresponding path program 1 times [2022-03-20 18:46:07,916 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:07,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [209414793] [2022-03-20 18:46:07,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:07,916 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:07,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:08,092 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:08,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:08,095 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:08,096 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:08,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [209414793] [2022-03-20 18:46:08,096 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [209414793] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:08,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1303474876] [2022-03-20 18:46:08,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:08,096 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:08,096 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:08,100 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) [2022-03-20 18:46:08,101 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-20 18:46:08,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:08,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-20 18:46:08,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:08,205 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:08,205 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:08,395 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:08,396 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1303474876] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:46:08,396 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:46:08,396 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 18 [2022-03-20 18:46:08,576 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:08,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1352139847] [2022-03-20 18:46:08,577 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1352139847] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:08,577 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:08,577 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-20 18:46:08,577 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823202056] [2022-03-20 18:46:08,577 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:08,577 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-20 18:46:08,577 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:08,578 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-20 18:46:08,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=405, Unknown=0, NotChecked=0, Total=462 [2022-03-20 18:46:08,578 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 17 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 16 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) [2022-03-20 18:46:09,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:09,649 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2022-03-20 18:46:09,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 18:46:09,650 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 16 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 [2022-03-20 18:46:09,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:09,650 INFO L225 Difference]: With dead ends: 34 [2022-03-20 18:46:09,650 INFO L226 Difference]: Without dead ends: 29 [2022-03-20 18:46:09,651 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 46 SyntacticMatches, 6 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=214, Invalid=1118, Unknown=0, NotChecked=0, Total=1332 [2022-03-20 18:46:09,651 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 23 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:09,651 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 76 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 209 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:46:09,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-20 18:46:09,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-03-20 18:46:09,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.125) internal successors, (27), 24 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) [2022-03-20 18:46:09,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2022-03-20 18:46:09,658 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 27 [2022-03-20 18:46:09,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:09,659 INFO L478 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2022-03-20 18:46:09,659 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 16 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) [2022-03-20 18:46:09,659 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2022-03-20 18:46:09,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-20 18:46:09,659 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:09,659 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:09,676 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-03-20 18:46:09,863 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-03-20 18:46:09,863 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:09,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:09,864 INFO L85 PathProgramCache]: Analyzing trace with hash 620636190, now seen corresponding path program 13 times [2022-03-20 18:46:09,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:09,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [264488289] [2022-03-20 18:46:09,983 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:09,984 INFO L85 PathProgramCache]: Analyzing trace with hash -1021006370, now seen corresponding path program 1 times [2022-03-20 18:46:09,984 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:09,984 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1011503002] [2022-03-20 18:46:09,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:09,984 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:09,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:10,583 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:10,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:10,588 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:10,588 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:10,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1011503002] [2022-03-20 18:46:10,588 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1011503002] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:10,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [167966893] [2022-03-20 18:46:10,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:10,588 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:10,588 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:10,589 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) [2022-03-20 18:46:10,590 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-20 18:46:10,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:10,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 38 conjunts are in the unsatisfiable core [2022-03-20 18:46:10,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:12,078 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:12,078 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:15,976 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:15,977 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [167966893] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:46:15,977 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:46:15,977 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 50 [2022-03-20 18:46:16,871 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:16,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [264488289] [2022-03-20 18:46:16,871 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [264488289] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:16,872 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:16,872 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-20 18:46:16,872 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264229465] [2022-03-20 18:46:16,872 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:16,872 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-20 18:46:16,872 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:16,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-20 18:46:16,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=328, Invalid=2642, Unknown=0, NotChecked=0, Total=2970 [2022-03-20 18:46:16,873 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 23 states, 23 states have (on average 1.0434782608695652) internal successors, (24), 21 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) [2022-03-20 18:46:19,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:19,661 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2022-03-20 18:46:19,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-20 18:46:19,661 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.0434782608695652) internal successors, (24), 21 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 [2022-03-20 18:46:19,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:19,662 INFO L225 Difference]: With dead ends: 41 [2022-03-20 18:46:19,662 INFO L226 Difference]: Without dead ends: 36 [2022-03-20 18:46:19,663 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1603 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=550, Invalid=5000, Unknown=0, NotChecked=0, Total=5550 [2022-03-20 18:46:19,664 INFO L913 BasicCegarLoop]: 10 mSDtfsCounter, 22 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 416 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 437 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 416 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:19,664 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 92 Invalid, 437 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 416 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-03-20 18:46:19,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-03-20 18:46:19,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 31. [2022-03-20 18:46:19,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 26 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:19,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2022-03-20 18:46:19,673 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 28 [2022-03-20 18:46:19,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:19,673 INFO L478 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2022-03-20 18:46:19,673 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.0434782608695652) internal successors, (24), 21 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) [2022-03-20 18:46:19,673 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2022-03-20 18:46:19,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-20 18:46:19,674 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:19,674 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:19,678 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-03-20 18:46:19,878 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,SelfDestructingSolverStorable15 [2022-03-20 18:46:19,878 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:19,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:19,879 INFO L85 PathProgramCache]: Analyzing trace with hash 2094347791, now seen corresponding path program 14 times [2022-03-20 18:46:19,879 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:19,879 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1609258698] [2022-03-20 18:46:19,989 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:19,990 INFO L85 PathProgramCache]: Analyzing trace with hash 236443791, now seen corresponding path program 1 times [2022-03-20 18:46:19,990 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:19,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1722646799] [2022-03-20 18:46:19,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:19,990 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:20,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:20,202 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:20,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:20,205 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:20,205 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:20,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1722646799] [2022-03-20 18:46:20,206 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1722646799] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:20,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1795029063] [2022-03-20 18:46:20,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:20,206 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:20,206 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:20,207 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) [2022-03-20 18:46:20,208 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-20 18:46:20,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:20,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-20 18:46:20,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:20,338 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:20,338 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:20,651 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:20,651 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1795029063] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:46:20,651 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:46:20,651 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 22 [2022-03-20 18:46:20,894 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:20,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1609258698] [2022-03-20 18:46:20,894 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1609258698] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:20,894 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:20,894 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-20 18:46:20,894 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635763025] [2022-03-20 18:46:20,894 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:20,895 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-20 18:46:20,895 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:20,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-20 18:46:20,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=576, Unknown=0, NotChecked=0, Total=650 [2022-03-20 18:46:20,895 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand has 19 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 18 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) [2022-03-20 18:46:22,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:22,155 INFO L93 Difference]: Finished difference Result 57 states and 63 transitions. [2022-03-20 18:46:22,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-03-20 18:46:22,156 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 18 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 [2022-03-20 18:46:22,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:22,156 INFO L225 Difference]: With dead ends: 57 [2022-03-20 18:46:22,156 INFO L226 Difference]: Without dead ends: 31 [2022-03-20 18:46:22,157 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 51 SyntacticMatches, 5 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 309 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=264, Invalid=1992, Unknown=0, NotChecked=0, Total=2256 [2022-03-20 18:46:22,157 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 24 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 339 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 380 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 339 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:22,157 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 83 Invalid, 380 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 339 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:46:22,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-03-20 18:46:22,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-03-20 18:46:22,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:22,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2022-03-20 18:46:22,166 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 29 [2022-03-20 18:46:22,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:22,166 INFO L478 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2022-03-20 18:46:22,166 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 18 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) [2022-03-20 18:46:22,166 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2022-03-20 18:46:22,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-03-20 18:46:22,166 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:22,166 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:22,183 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-03-20 18:46:22,371 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:22,371 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:22,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:22,372 INFO L85 PathProgramCache]: Analyzing trace with hash 751514495, now seen corresponding path program 15 times [2022-03-20 18:46:22,372 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:22,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [334732209] [2022-03-20 18:46:22,486 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:22,487 INFO L85 PathProgramCache]: Analyzing trace with hash -126451776, now seen corresponding path program 1 times [2022-03-20 18:46:22,487 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:22,487 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1422715165] [2022-03-20 18:46:22,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:22,487 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:22,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:22,701 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:22,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:22,716 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:22,716 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:22,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1422715165] [2022-03-20 18:46:22,716 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1422715165] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:22,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1912161774] [2022-03-20 18:46:22,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:22,716 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:22,716 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:22,718 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) [2022-03-20 18:46:22,719 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-20 18:46:22,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:22,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-20 18:46:22,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:22,900 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:22,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:23,168 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:23,169 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1912161774] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:46:23,169 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:46:23,169 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 22 [2022-03-20 18:46:23,597 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:23,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [334732209] [2022-03-20 18:46:23,597 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [334732209] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:23,597 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:23,597 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-20 18:46:23,597 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231608266] [2022-03-20 18:46:23,597 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:23,597 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-20 18:46:23,597 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:23,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-20 18:46:23,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=622, Unknown=0, NotChecked=0, Total=702 [2022-03-20 18:46:23,598 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand has 20 states, 20 states have (on average 1.3) internal successors, (26), 19 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) [2022-03-20 18:46:25,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:25,638 INFO L93 Difference]: Finished difference Result 37 states and 39 transitions. [2022-03-20 18:46:25,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-03-20 18:46:25,639 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.3) internal successors, (26), 19 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 [2022-03-20 18:46:25,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:25,639 INFO L225 Difference]: With dead ends: 37 [2022-03-20 18:46:25,639 INFO L226 Difference]: Without dead ends: 32 [2022-03-20 18:46:25,640 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 48 SyntacticMatches, 6 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 273 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=295, Invalid=1685, Unknown=0, NotChecked=0, Total=1980 [2022-03-20 18:46:25,640 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 27 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 255 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 255 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:25,640 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 81 Invalid, 323 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 255 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-20 18:46:25,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-03-20 18:46:25,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-03-20 18:46:25,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 27 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:25,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2022-03-20 18:46:25,649 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 30 [2022-03-20 18:46:25,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:25,649 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2022-03-20 18:46:25,649 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.3) internal successors, (26), 19 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) [2022-03-20 18:46:25,649 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2022-03-20 18:46:25,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-20 18:46:25,650 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:25,650 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:25,669 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-20 18:46:25,863 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-20 18:46:25,863 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:25,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:25,864 INFO L85 PathProgramCache]: Analyzing trace with hash 1856607950, now seen corresponding path program 16 times [2022-03-20 18:46:25,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:25,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1908363301] [2022-03-20 18:46:25,976 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:25,976 INFO L85 PathProgramCache]: Analyzing trace with hash 14510701, now seen corresponding path program 1 times [2022-03-20 18:46:25,977 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:25,977 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [516536220] [2022-03-20 18:46:25,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:25,977 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:25,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:26,304 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:26,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:26,308 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:26,308 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:26,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [516536220] [2022-03-20 18:46:26,308 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [516536220] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:26,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [836114276] [2022-03-20 18:46:26,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:26,308 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:26,308 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:26,309 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) [2022-03-20 18:46:26,310 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-20 18:46:26,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:26,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 41 conjunts are in the unsatisfiable core [2022-03-20 18:46:26,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:27,627 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:27,628 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:47:02,063 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:47:02,064 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [836114276] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:47:02,064 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:47:02,064 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21, 21] total 44 [2022-03-20 18:47:03,501 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:47:03,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1908363301] [2022-03-20 18:47:03,501 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1908363301] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:47:03,501 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:47:03,501 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-20 18:47:03,501 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324256239] [2022-03-20 18:47:03,501 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:47:03,502 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-20 18:47:03,502 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:03,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-20 18:47:03,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=2165, Unknown=14, NotChecked=0, Total=2450 [2022-03-20 18:47:03,503 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 20 states, 20 states have (on average 1.35) internal successors, (27), 18 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) [2022-03-20 18:47:05,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:47:05,948 INFO L93 Difference]: Finished difference Result 45 states and 48 transitions. [2022-03-20 18:47:05,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-03-20 18:47:05,949 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.35) internal successors, (27), 18 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 [2022-03-20 18:47:05,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:47:05,949 INFO L225 Difference]: With dead ends: 45 [2022-03-20 18:47:05,949 INFO L226 Difference]: Without dead ends: 40 [2022-03-20 18:47:05,950 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 30 SyntacticMatches, 4 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1189 ImplicationChecksByTransitivity, 38.5s TimeCoverageRelationStatistics Valid=440, Invalid=4102, Unknown=14, NotChecked=0, Total=4556 [2022-03-20 18:47:05,950 INFO L913 BasicCegarLoop]: 10 mSDtfsCounter, 19 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 423 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 441 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 423 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:47:05,951 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 87 Invalid, 441 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 423 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-20 18:47:05,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-03-20 18:47:05,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 34. [2022-03-20 18:47:05,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 29 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) [2022-03-20 18:47:05,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2022-03-20 18:47:05,961 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 31 [2022-03-20 18:47:05,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:47:05,961 INFO L478 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2022-03-20 18:47:05,961 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.35) internal successors, (27), 18 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) [2022-03-20 18:47:05,961 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2022-03-20 18:47:05,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-20 18:47:05,962 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:47:05,962 INFO L499 BasicCegarLoop]: trace histogram [7, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:47:05,980 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-20 18:47:06,163 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:06,163 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:47:06,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:47:06,163 INFO L85 PathProgramCache]: Analyzing trace with hash 1754766687, now seen corresponding path program 17 times [2022-03-20 18:47:06,163 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:06,163 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1533226288] [2022-03-20 18:47:06,287 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:47:06,288 INFO L85 PathProgramCache]: Analyzing trace with hash 1125883360, now seen corresponding path program 1 times [2022-03-20 18:47:06,288 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:06,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [451413183] [2022-03-20 18:47:06,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:06,288 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:06,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:06,617 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:47:06,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:06,621 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:47:06,622 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:47:06,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [451413183] [2022-03-20 18:47:06,622 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [451413183] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:47:06,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1014962752] [2022-03-20 18:47:06,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:06,622 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:06,622 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:47:06,623 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) [2022-03-20 18:47:06,623 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-20 18:47:06,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:06,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-20 18:47:06,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:47:06,771 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:47:06,771 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:47:07,203 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:47:07,203 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1014962752] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:47:07,203 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:47:07,203 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 25 [2022-03-20 18:47:07,945 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:47:07,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1533226288] [2022-03-20 18:47:07,945 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1533226288] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:47:07,945 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:47:07,945 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-03-20 18:47:07,945 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1880524795] [2022-03-20 18:47:07,945 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:47:07,945 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-20 18:47:07,945 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:07,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-20 18:47:07,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=781, Unknown=0, NotChecked=0, Total=870 [2022-03-20 18:47:07,946 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 22 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 21 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) [2022-03-20 18:47:10,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:47:10,695 INFO L93 Difference]: Finished difference Result 63 states and 69 transitions. [2022-03-20 18:47:10,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-03-20 18:47:10,695 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 21 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 [2022-03-20 18:47:10,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:47:10,695 INFO L225 Difference]: With dead ends: 63 [2022-03-20 18:47:10,695 INFO L226 Difference]: Without dead ends: 34 [2022-03-20 18:47:10,697 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 53 SyntacticMatches, 6 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=335, Invalid=2745, Unknown=0, NotChecked=0, Total=3080 [2022-03-20 18:47:10,697 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 24 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 424 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 424 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:47:10,697 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 88 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 424 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-20 18:47:10,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-03-20 18:47:10,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2022-03-20 18:47:10,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.103448275862069) internal successors, (32), 29 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:10,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2022-03-20 18:47:10,707 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 32 [2022-03-20 18:47:10,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:47:10,707 INFO L478 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2022-03-20 18:47:10,707 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 21 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) [2022-03-20 18:47:10,707 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2022-03-20 18:47:10,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-20 18:47:10,707 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:47:10,707 INFO L499 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:47:10,723 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-03-20 18:47:10,911 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:10,911 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:47:10,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:47:10,912 INFO L85 PathProgramCache]: Analyzing trace with hash 1766095279, now seen corresponding path program 18 times [2022-03-20 18:47:10,912 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:10,912 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1626976311] [2022-03-20 18:47:11,030 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:47:11,030 INFO L85 PathProgramCache]: Analyzing trace with hash -497441457, now seen corresponding path program 1 times [2022-03-20 18:47:11,030 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:11,030 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1506789279] [2022-03-20 18:47:11,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:11,030 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:11,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:11,349 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:47:11,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:11,353 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:47:11,353 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:47:11,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1506789279] [2022-03-20 18:47:11,354 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1506789279] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:47:11,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [267012428] [2022-03-20 18:47:11,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:11,354 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:11,354 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:47:11,355 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) [2022-03-20 18:47:11,356 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-20 18:47:11,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:11,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-20 18:47:11,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:47:11,502 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:47:11,502 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:47:11,897 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:47:11,897 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [267012428] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:47:11,897 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:47:11,897 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 24 [2022-03-20 18:47:13,018 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:47:13,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1626976311] [2022-03-20 18:47:13,018 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1626976311] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:47:13,018 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:47:13,018 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-20 18:47:13,018 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588087342] [2022-03-20 18:47:13,019 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:47:13,019 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-20 18:47:13,019 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:13,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-20 18:47:13,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=784, Unknown=0, NotChecked=0, Total=870 [2022-03-20 18:47:13,019 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand has 23 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 22 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) [2022-03-20 18:47:17,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:47:17,719 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2022-03-20 18:47:17,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-03-20 18:47:17,719 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 22 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 [2022-03-20 18:47:17,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:47:17,720 INFO L225 Difference]: With dead ends: 40 [2022-03-20 18:47:17,720 INFO L226 Difference]: Without dead ends: 35 [2022-03-20 18:47:17,721 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 51 SyntacticMatches, 7 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 336 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=368, Invalid=2182, Unknown=0, NotChecked=0, Total=2550 [2022-03-20 18:47:17,721 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 25 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 335 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 335 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:47:17,721 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 96 Invalid, 423 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 335 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-03-20 18:47:17,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-20 18:47:17,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-03-20 18:47:17,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.1) internal successors, (33), 30 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) [2022-03-20 18:47:17,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2022-03-20 18:47:17,735 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 33 [2022-03-20 18:47:17,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:47:17,735 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2022-03-20 18:47:17,736 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 22 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) [2022-03-20 18:47:17,736 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2022-03-20 18:47:17,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-20 18:47:17,736 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:47:17,736 INFO L499 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:47:17,752 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-03-20 18:47:17,943 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:17,944 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:47:17,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:47:17,944 INFO L85 PathProgramCache]: Analyzing trace with hash -1051126114, now seen corresponding path program 19 times [2022-03-20 18:47:17,944 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:17,944 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1321939339] [2022-03-20 18:47:18,064 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:47:18,065 INFO L85 PathProgramCache]: Analyzing trace with hash 207095486, now seen corresponding path program 1 times [2022-03-20 18:47:18,065 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:18,065 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1843681605] [2022-03-20 18:47:18,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:18,065 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:18,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:19,405 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:47:19,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:19,409 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:47:19,409 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:47:19,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1843681605] [2022-03-20 18:47:19,409 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1843681605] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:47:19,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1434824464] [2022-03-20 18:47:19,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:19,409 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:19,409 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:47:19,410 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) [2022-03-20 18:47:19,414 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-20 18:47:19,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:19,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 56 conjunts are in the unsatisfiable core [2022-03-20 18:47:19,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:47:22,243 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:47:22,243 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:47:27,011 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:47:27,011 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1434824464] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:47:27,011 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:47:27,011 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 64 [2022-03-20 18:47:38,176 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:47:38,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1321939339] [2022-03-20 18:47:38,176 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1321939339] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:47:38,176 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:47:38,176 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-03-20 18:47:38,176 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [237874429] [2022-03-20 18:47:38,177 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:47:38,177 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-03-20 18:47:38,177 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:38,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-03-20 18:47:38,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=641, Invalid=4328, Unknown=1, NotChecked=0, Total=4970 [2022-03-20 18:47:38,178 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 29 states, 29 states have (on average 1.0344827586206897) internal successors, (30), 27 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) [2022-03-20 18:47:52,648 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.27s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:47:55,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:47:55,874 INFO L93 Difference]: Finished difference Result 49 states and 52 transitions. [2022-03-20 18:47:55,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-03-20 18:47:55,875 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.0344827586206897) internal successors, (30), 27 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 [2022-03-20 18:47:55,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:47:55,875 INFO L225 Difference]: With dead ends: 49 [2022-03-20 18:47:55,875 INFO L226 Difference]: Without dead ends: 44 [2022-03-20 18:47:55,876 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2473 ImplicationChecksByTransitivity, 32.0s TimeCoverageRelationStatistics Valid=985, Invalid=8325, Unknown=2, NotChecked=0, Total=9312 [2022-03-20 18:47:55,877 INFO L913 BasicCegarLoop]: 10 mSDtfsCounter, 24 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 649 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 668 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 649 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:47:55,877 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 112 Invalid, 668 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 649 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2022-03-20 18:47:55,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-03-20 18:47:55,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 37. [2022-03-20 18:47:55,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.125) internal successors, (36), 32 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:55,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2022-03-20 18:47:55,890 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 34 [2022-03-20 18:47:55,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:47:55,890 INFO L478 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2022-03-20 18:47:55,890 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.0344827586206897) internal successors, (30), 27 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) [2022-03-20 18:47:55,890 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2022-03-20 18:47:55,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-20 18:47:55,891 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:47:55,891 INFO L499 BasicCegarLoop]: trace histogram [8, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:47:55,894 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-03-20 18:47:56,091 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:56,091 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:47:56,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:47:56,091 INFO L85 PathProgramCache]: Analyzing trace with hash 1809323919, now seen corresponding path program 20 times [2022-03-20 18:47:56,091 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:56,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [600889959] [2022-03-20 18:47:56,217 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:47:56,218 INFO L85 PathProgramCache]: Analyzing trace with hash 220036015, now seen corresponding path program 1 times [2022-03-20 18:47:56,218 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:56,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1701359070] [2022-03-20 18:47:56,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:56,218 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:56,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:56,635 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:47:56,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:56,638 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:47:56,638 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:47:56,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1701359070] [2022-03-20 18:47:56,638 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1701359070] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:47:56,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [816171922] [2022-03-20 18:47:56,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:56,638 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:56,638 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:47:56,639 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) [2022-03-20 18:47:56,640 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-20 18:47:56,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:56,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 32 conjunts are in the unsatisfiable core [2022-03-20 18:47:56,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:47:56,815 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:47:56,815 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:47:57,452 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:47:57,453 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [816171922] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:47:57,453 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:47:57,453 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 28 [2022-03-20 18:47:58,687 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:47:58,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [600889959] [2022-03-20 18:47:58,688 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [600889959] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:47:58,688 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:47:58,688 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-03-20 18:47:58,688 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491297482] [2022-03-20 18:47:58,688 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:47:58,688 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-03-20 18:47:58,688 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:58,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-03-20 18:47:58,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1017, Unknown=0, NotChecked=0, Total=1122 [2022-03-20 18:47:58,689 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand has 25 states, 25 states have (on average 1.24) internal successors, (31), 24 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) [2022-03-20 18:48:03,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:48:03,461 INFO L93 Difference]: Finished difference Result 69 states and 75 transitions. [2022-03-20 18:48:03,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-03-20 18:48:03,462 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.24) internal successors, (31), 24 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 [2022-03-20 18:48:03,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:48:03,462 INFO L225 Difference]: With dead ends: 69 [2022-03-20 18:48:03,462 INFO L226 Difference]: Without dead ends: 37 [2022-03-20 18:48:03,463 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 57 SyntacticMatches, 5 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 601 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=407, Invalid=3625, Unknown=0, NotChecked=0, Total=4032 [2022-03-20 18:48:03,463 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 24 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 565 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 623 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 565 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-03-20 18:48:03,464 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 108 Invalid, 623 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 565 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-03-20 18:48:03,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-03-20 18:48:03,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2022-03-20 18:48:03,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.09375) internal successors, (35), 32 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) [2022-03-20 18:48:03,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2022-03-20 18:48:03,478 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 35 [2022-03-20 18:48:03,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:48:03,479 INFO L478 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2022-03-20 18:48:03,479 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.24) internal successors, (31), 24 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) [2022-03-20 18:48:03,479 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2022-03-20 18:48:03,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-20 18:48:03,479 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:48:03,479 INFO L499 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:48:03,495 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-03-20 18:48:03,679 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,SelfDestructingSolverStorable22 [2022-03-20 18:48:03,680 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:48:03,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:48:03,680 INFO L85 PathProgramCache]: Analyzing trace with hash 1944519039, now seen corresponding path program 21 times [2022-03-20 18:48:03,680 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:48:03,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [431231410] [2022-03-20 18:48:03,803 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:48:03,804 INFO L85 PathProgramCache]: Analyzing trace with hash 1083706016, now seen corresponding path program 1 times [2022-03-20 18:48:03,804 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:48:03,804 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [441015539] [2022-03-20 18:48:03,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:48:03,804 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:48:03,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:04,230 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:48:04,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:04,244 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:48:04,244 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:48:04,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [441015539] [2022-03-20 18:48:04,244 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [441015539] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:48:04,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1452284698] [2022-03-20 18:48:04,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:48:04,244 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:48:04,244 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:48:04,245 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) [2022-03-20 18:48:04,246 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-03-20 18:48:04,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:04,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 32 conjunts are in the unsatisfiable core [2022-03-20 18:48:04,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:48:04,414 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:48:04,415 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:48:05,001 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:48:05,001 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1452284698] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:48:05,001 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:48:05,001 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 27 [2022-03-20 18:48:07,442 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:48:07,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [431231410] [2022-03-20 18:48:07,442 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [431231410] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:48:07,442 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:48:07,442 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-03-20 18:48:07,442 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [993182803] [2022-03-20 18:48:07,442 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:48:07,443 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-20 18:48:07,443 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:48:07,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-20 18:48:07,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1020, Unknown=0, NotChecked=0, Total=1122 [2022-03-20 18:48:07,443 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 26 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 25 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) [2022-03-20 18:48:17,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:48:17,280 INFO L93 Difference]: Finished difference Result 43 states and 45 transitions. [2022-03-20 18:48:17,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-03-20 18:48:17,280 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 25 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 [2022-03-20 18:48:17,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:48:17,281 INFO L225 Difference]: With dead ends: 43 [2022-03-20 18:48:17,281 INFO L226 Difference]: Without dead ends: 38 [2022-03-20 18:48:17,281 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 54 SyntacticMatches, 7 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 448 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=460, Invalid=2846, Unknown=0, NotChecked=0, Total=3306 [2022-03-20 18:48:17,282 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 31 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 398 mSolverCounterSat, 108 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 506 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 108 IncrementalHoareTripleChecker+Valid, 398 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:48:17,282 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 106 Invalid, 506 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [108 Valid, 398 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-03-20 18:48:17,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-03-20 18:48:17,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-03-20 18:48:17,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 33 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:48:17,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2022-03-20 18:48:17,294 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 36 [2022-03-20 18:48:17,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:48:17,295 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2022-03-20 18:48:17,295 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 25 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) [2022-03-20 18:48:17,295 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2022-03-20 18:48:17,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-20 18:48:17,295 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:48:17,295 INFO L499 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:48:17,311 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-03-20 18:48:17,495 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-03-20 18:48:17,495 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:48:17,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:48:17,496 INFO L85 PathProgramCache]: Analyzing trace with hash 185043150, now seen corresponding path program 22 times [2022-03-20 18:48:17,496 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:48:17,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1345178620] [2022-03-20 18:48:17,615 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:48:17,615 INFO L85 PathProgramCache]: Analyzing trace with hash -723821683, now seen corresponding path program 1 times [2022-03-20 18:48:17,615 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:48:17,615 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [963432161] [2022-03-20 18:48:17,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:48:17,616 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:48:17,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:18,706 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:48:18,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:18,711 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:48:18,711 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:48:18,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [963432161] [2022-03-20 18:48:18,711 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [963432161] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:48:18,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1072534467] [2022-03-20 18:48:18,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:48:18,712 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:48:18,712 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:48:18,713 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) [2022-03-20 18:48:18,713 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-03-20 18:48:18,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:18,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 53 conjunts are in the unsatisfiable core [2022-03-20 18:48:18,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:48:22,407 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:48:22,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:48:28,091 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:48:28,091 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1072534467] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:48:28,091 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:48:28,091 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25] total 68 [2022-03-20 18:48:38,601 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:48:38,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1345178620] [2022-03-20 18:48:38,601 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1345178620] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:48:38,602 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:48:38,602 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-03-20 18:48:38,602 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446796157] [2022-03-20 18:48:38,602 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:48:38,602 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-03-20 18:48:38,602 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:48:38,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-03-20 18:48:38,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=5228, Unknown=1, NotChecked=0, Total=5700 [2022-03-20 18:48:38,603 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 32 states, 32 states have (on average 1.03125) internal successors, (33), 30 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) [2022-03-20 18:48:54,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:48:54,336 INFO L93 Difference]: Finished difference Result 53 states and 56 transitions. [2022-03-20 18:48:54,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-03-20 18:48:54,336 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.03125) internal successors, (33), 30 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 [2022-03-20 18:48:54,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:48:54,337 INFO L225 Difference]: With dead ends: 53 [2022-03-20 18:48:54,337 INFO L226 Difference]: Without dead ends: 48 [2022-03-20 18:48:54,338 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2868 ImplicationChecksByTransitivity, 32.4s TimeCoverageRelationStatistics Valid=770, Invalid=10149, Unknown=1, NotChecked=0, Total=10920 [2022-03-20 18:48:54,338 INFO L913 BasicCegarLoop]: 10 mSDtfsCounter, 22 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 831 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 851 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 831 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:48:54,338 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 132 Invalid, 851 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 831 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-03-20 18:48:54,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-03-20 18:48:54,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 40. [2022-03-20 18:48:54,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.1142857142857143) internal successors, (39), 35 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) [2022-03-20 18:48:54,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2022-03-20 18:48:54,354 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 37 [2022-03-20 18:48:54,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:48:54,354 INFO L478 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2022-03-20 18:48:54,354 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.03125) internal successors, (33), 30 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) [2022-03-20 18:48:54,354 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2022-03-20 18:48:54,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-20 18:48:54,355 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:48:54,355 INFO L499 BasicCegarLoop]: trace histogram [9, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:48:54,360 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-03-20 18:48:54,558 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:48:54,559 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:48:54,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:48:54,559 INFO L85 PathProgramCache]: Analyzing trace with hash 1475865439, now seen corresponding path program 23 times [2022-03-20 18:48:54,559 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:48:54,559 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1612180385] [2022-03-20 18:48:54,646 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:48:54,646 INFO L85 PathProgramCache]: Analyzing trace with hash -726552384, now seen corresponding path program 1 times [2022-03-20 18:48:54,646 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:48:54,646 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1099347603] [2022-03-20 18:48:54,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:48:54,647 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:48:54,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:55,390 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:48:55,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:55,394 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 9 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:48:55,395 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:48:55,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1099347603] [2022-03-20 18:48:55,395 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1099347603] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:48:55,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [317425223] [2022-03-20 18:48:55,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:48:55,395 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:48:55,395 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:48:55,396 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) [2022-03-20 18:48:55,396 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-03-20 18:48:55,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:55,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 36 conjunts are in the unsatisfiable core [2022-03-20 18:48:55,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:48:55,606 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 9 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:48:55,606 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:48:56,546 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 9 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:48:56,546 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [317425223] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:48:56,546 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:48:56,546 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 31 [2022-03-20 18:49:01,305 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:49:01,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1612180385] [2022-03-20 18:49:01,305 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1612180385] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:49:01,305 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:49:01,305 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-03-20 18:49:01,306 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72779253] [2022-03-20 18:49:01,306 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:49:01,306 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-03-20 18:49:01,306 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:49:01,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-03-20 18:49:01,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1284, Unknown=0, NotChecked=0, Total=1406 [2022-03-20 18:49:01,307 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 28 states, 28 states have (on average 1.2142857142857142) internal successors, (34), 27 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) [2022-03-20 18:49:13,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:49:13,807 INFO L93 Difference]: Finished difference Result 75 states and 81 transitions. [2022-03-20 18:49:13,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-03-20 18:49:13,808 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.2142857142857142) internal successors, (34), 27 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 [2022-03-20 18:49:13,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:49:13,808 INFO L225 Difference]: With dead ends: 75 [2022-03-20 18:49:13,808 INFO L226 Difference]: Without dead ends: 40 [2022-03-20 18:49:13,809 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 60 SyntacticMatches, 5 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 783 ImplicationChecksByTransitivity, 16.8s TimeCoverageRelationStatistics Valid=493, Invalid=4619, Unknown=0, NotChecked=0, Total=5112 [2022-03-20 18:49:13,809 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 24 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 727 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 791 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 727 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-03-20 18:49:13,809 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 128 Invalid, 791 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 727 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-03-20 18:49:13,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-03-20 18:49:13,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2022-03-20 18:49:13,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 35 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:49:13,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2022-03-20 18:49:13,824 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 38 [2022-03-20 18:49:13,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:49:13,824 INFO L478 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2022-03-20 18:49:13,824 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.2142857142857142) internal successors, (34), 27 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) [2022-03-20 18:49:13,824 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2022-03-20 18:49:13,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-20 18:49:13,824 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:49:13,824 INFO L499 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:49:13,840 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-03-20 18:49:14,024 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:49:14,025 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:49:14,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:49:14,025 INFO L85 PathProgramCache]: Analyzing trace with hash 638163759, now seen corresponding path program 24 times [2022-03-20 18:49:14,025 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:49:14,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1607641338] [2022-03-20 18:49:14,150 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:49:14,150 INFO L85 PathProgramCache]: Analyzing trace with hash 473466991, now seen corresponding path program 1 times [2022-03-20 18:49:14,150 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:49:14,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1479294776] [2022-03-20 18:49:14,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:49:14,150 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:49:14,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:49:14,828 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:49:14,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:49:14,836 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:49:14,836 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:49:14,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1479294776] [2022-03-20 18:49:14,836 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1479294776] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:49:14,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1539464948] [2022-03-20 18:49:14,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:49:14,837 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:49:14,837 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:49:14,838 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) [2022-03-20 18:49:14,838 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-03-20 18:49:14,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:49:14,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 36 conjunts are in the unsatisfiable core [2022-03-20 18:49:14,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:49:15,055 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:49:15,055 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:49:15,958 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 9 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:49:15,958 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1539464948] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:49:15,958 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:49:15,958 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 30 [2022-03-20 18:49:22,762 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:49:22,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1607641338] [2022-03-20 18:49:22,763 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1607641338] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:49:22,763 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:49:22,763 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-03-20 18:49:22,763 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1035632537] [2022-03-20 18:49:22,763 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:49:22,763 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-03-20 18:49:22,763 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:49:22,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-03-20 18:49:22,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1287, Unknown=0, NotChecked=0, Total=1406 [2022-03-20 18:49:22,764 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 29 states, 29 states have (on average 1.206896551724138) internal successors, (35), 28 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) [2022-03-20 18:49:39,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:49:39,033 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2022-03-20 18:49:39,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-03-20 18:49:39,034 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.206896551724138) internal successors, (35), 28 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 [2022-03-20 18:49:39,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:49:39,034 INFO L225 Difference]: With dead ends: 46 [2022-03-20 18:49:39,034 INFO L226 Difference]: Without dead ends: 41 [2022-03-20 18:49:39,035 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 57 SyntacticMatches, 7 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 576 ImplicationChecksByTransitivity, 20.6s TimeCoverageRelationStatistics Valid=562, Invalid=3598, Unknown=0, NotChecked=0, Total=4160 [2022-03-20 18:49:39,035 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 37 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 467 mSolverCounterSat, 136 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 603 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 136 IncrementalHoareTripleChecker+Valid, 467 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:49:39,035 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 116 Invalid, 603 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [136 Valid, 467 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2022-03-20 18:49:39,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-03-20 18:49:39,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-03-20 18:49:39,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 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) [2022-03-20 18:49:39,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2022-03-20 18:49:39,051 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 39 [2022-03-20 18:49:39,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:49:39,051 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2022-03-20 18:49:39,051 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.206896551724138) internal successors, (35), 28 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) [2022-03-20 18:49:39,051 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2022-03-20 18:49:39,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-03-20 18:49:39,051 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:49:39,051 INFO L499 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:49:39,068 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-03-20 18:49:39,251 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,SelfDestructingSolverStorable26 [2022-03-20 18:49:39,252 INFO L403 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:49:39,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:49:39,252 INFO L85 PathProgramCache]: Analyzing trace with hash -1657264866, now seen corresponding path program 25 times [2022-03-20 18:49:39,252 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:49:39,252 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1759343300] [2022-03-20 18:49:39,373 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:49:39,374 INFO L85 PathProgramCache]: Analyzing trace with hash -482629730, now seen corresponding path program 1 times [2022-03-20 18:49:39,374 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:49:39,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [381780736] [2022-03-20 18:49:39,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:49:39,374 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:49:39,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:49:41,209 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:49:41,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:49:41,220 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:49:41,220 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:49:41,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [381780736] [2022-03-20 18:49:41,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [381780736] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:49:41,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1672773622] [2022-03-20 18:49:41,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:49:41,221 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:49:41,221 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:49:41,222 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) [2022-03-20 18:49:41,223 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-03-20 18:49:41,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:49:41,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 49 conjunts are in the unsatisfiable core [2022-03-20 18:49:41,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:49:46,076 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:49:46,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:49:52,795 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:49:52,795 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1672773622] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:49:52,796 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:49:52,796 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 27] total 74 [2022-03-20 18:50:12,837 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:50:12,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1759343300] [2022-03-20 18:50:12,837 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1759343300] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:50:12,837 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:50:12,837 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-03-20 18:50:12,837 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381249225] [2022-03-20 18:50:12,837 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:50:12,837 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-03-20 18:50:12,837 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:12,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-03-20 18:50:12,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=599, Invalid=6207, Unknown=0, NotChecked=0, Total=6806 [2022-03-20 18:50:12,838 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 35 states, 35 states have (on average 1.0285714285714285) internal successors, (36), 33 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) [2022-03-20 18:50:37,803 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.15s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:50:41,618 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.48s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:50:46,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:50:46,118 INFO L93 Difference]: Finished difference Result 57 states and 60 transitions. [2022-03-20 18:50:46,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-03-20 18:50:46,118 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.0285714285714285) internal successors, (36), 33 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 [2022-03-20 18:50:46,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:50:46,119 INFO L225 Difference]: With dead ends: 57 [2022-03-20 18:50:46,119 INFO L226 Difference]: Without dead ends: 52 [2022-03-20 18:50:46,120 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3385 ImplicationChecksByTransitivity, 56.4s TimeCoverageRelationStatistics Valid=1038, Invalid=12071, Unknown=1, NotChecked=0, Total=13110 [2022-03-20 18:50:46,120 INFO L913 BasicCegarLoop]: 10 mSDtfsCounter, 24 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 771 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 800 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 771 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:50:46,120 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 112 Invalid, 800 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 771 Invalid, 0 Unknown, 0 Unchecked, 8.1s Time] [2022-03-20 18:50:46,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-03-20 18:50:46,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 43. [2022-03-20 18:50:46,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.105263157894737) internal successors, (42), 38 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) [2022-03-20 18:50:46,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2022-03-20 18:50:46,140 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 40 [2022-03-20 18:50:46,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:50:46,140 INFO L478 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2022-03-20 18:50:46,141 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.0285714285714285) internal successors, (36), 33 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) [2022-03-20 18:50:46,141 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2022-03-20 18:50:46,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-20 18:50:46,141 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:50:46,141 INFO L499 BasicCegarLoop]: trace histogram [10, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:50:46,166 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-03-20 18:50:46,345 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-03-20 18:50:46,345 INFO L403 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:50:46,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:50:46,345 INFO L85 PathProgramCache]: Analyzing trace with hash 198891791, now seen corresponding path program 26 times [2022-03-20 18:50:46,345 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:46,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1360079789] [2022-03-20 18:50:46,468 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:50:46,468 INFO L85 PathProgramCache]: Analyzing trace with hash -628369713, now seen corresponding path program 1 times [2022-03-20 18:50:46,469 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:50:46,469 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1868121845] [2022-03-20 18:50:46,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:50:46,469 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:50:46,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:47,437 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:50:47,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:47,440 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:50:47,440 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:50:47,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1868121845] [2022-03-20 18:50:47,440 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1868121845] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:50:47,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [267887866] [2022-03-20 18:50:47,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:50:47,440 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:50:47,440 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:50:47,441 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) [2022-03-20 18:50:47,442 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-03-20 18:50:47,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:47,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 40 conjunts are in the unsatisfiable core [2022-03-20 18:50:47,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:50:47,698 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:50:47,698 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:50:48,922 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:50:48,923 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [267887866] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:50:48,923 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:50:48,923 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 34 [2022-03-20 18:50:59,402 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:50:59,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1360079789] [2022-03-20 18:50:59,402 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1360079789] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:50:59,402 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:50:59,402 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-03-20 18:50:59,402 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675464976] [2022-03-20 18:50:59,402 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:50:59,402 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-03-20 18:50:59,402 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:59,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-03-20 18:50:59,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1582, Unknown=0, NotChecked=0, Total=1722 [2022-03-20 18:50:59,403 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand has 31 states, 31 states have (on average 1.1935483870967742) internal successors, (37), 30 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) [2022-03-20 18:51:28,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:28,695 INFO L93 Difference]: Finished difference Result 81 states and 87 transitions. [2022-03-20 18:51:28,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-03-20 18:51:28,696 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.1935483870967742) internal successors, (37), 30 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 [2022-03-20 18:51:28,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:28,696 INFO L225 Difference]: With dead ends: 81 [2022-03-20 18:51:28,696 INFO L226 Difference]: Without dead ends: 43 [2022-03-20 18:51:28,697 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 62 SyntacticMatches, 6 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 989 ImplicationChecksByTransitivity, 37.8s TimeCoverageRelationStatistics Valid=578, Invalid=5742, Unknown=0, NotChecked=0, Total=6320 [2022-03-20 18:51:28,697 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 36 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 780 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 875 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 780 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:28,697 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 118 Invalid, 875 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 780 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2022-03-20 18:51:28,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-03-20 18:51:28,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2022-03-20 18:51:28,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 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) [2022-03-20 18:51:28,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2022-03-20 18:51:28,719 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 41 [2022-03-20 18:51:28,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:28,719 INFO L478 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2022-03-20 18:51:28,719 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.1935483870967742) internal successors, (37), 30 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) [2022-03-20 18:51:28,719 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2022-03-20 18:51:28,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-20 18:51:28,719 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:28,719 INFO L499 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:28,735 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2022-03-20 18:51:28,920 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,SelfDestructingSolverStorable28 [2022-03-20 18:51:28,920 INFO L403 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:28,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:28,920 INFO L85 PathProgramCache]: Analyzing trace with hash 1251028863, now seen corresponding path program 27 times [2022-03-20 18:51:28,920 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:28,920 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1016259286] [2022-03-20 18:51:29,046 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:29,047 INFO L85 PathProgramCache]: Analyzing trace with hash 1640979840, now seen corresponding path program 1 times [2022-03-20 18:51:29,047 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:29,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1562472038] [2022-03-20 18:51:29,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:29,047 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:29,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:30,322 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:30,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:30,332 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:51:30,332 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:30,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1562472038] [2022-03-20 18:51:30,333 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1562472038] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:30,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [460101068] [2022-03-20 18:51:30,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:30,333 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:30,333 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:30,335 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) [2022-03-20 18:51:30,335 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-03-20 18:51:30,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:30,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 40 conjunts are in the unsatisfiable core [2022-03-20 18:51:30,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:30,663 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:51:30,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:32,147 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:51:32,147 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [460101068] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:32,147 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:32,147 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 33 [2022-03-20 18:51:46,852 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:46,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1016259286] [2022-03-20 18:51:46,852 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1016259286] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:46,852 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:46,852 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-03-20 18:51:46,852 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826568400] [2022-03-20 18:51:46,852 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:46,852 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-03-20 18:51:46,852 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:46,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-03-20 18:51:46,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=1585, Unknown=0, NotChecked=0, Total=1722 [2022-03-20 18:51:46,853 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 32 states, 32 states have (on average 1.1875) internal successors, (38), 31 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) [2022-03-20 18:52:25,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:52:25,654 INFO L93 Difference]: Finished difference Result 49 states and 51 transitions. [2022-03-20 18:52:25,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-03-20 18:52:25,655 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.1875) internal successors, (38), 31 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 [2022-03-20 18:52:25,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:52:25,656 INFO L225 Difference]: With dead ends: 49 [2022-03-20 18:52:25,656 INFO L226 Difference]: Without dead ends: 44 [2022-03-20 18:52:25,656 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 60 SyntacticMatches, 7 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 720 ImplicationChecksByTransitivity, 47.3s TimeCoverageRelationStatistics Valid=674, Invalid=4438, Unknown=0, NotChecked=0, Total=5112 [2022-03-20 18:52:25,657 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 31 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 588 mSolverCounterSat, 154 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 742 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 154 IncrementalHoareTripleChecker+Valid, 588 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.8s IncrementalHoareTripleChecker+Time [2022-03-20 18:52:25,657 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 136 Invalid, 742 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [154 Valid, 588 Invalid, 0 Unknown, 0 Unchecked, 8.8s Time] [2022-03-20 18:52:25,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-03-20 18:52:25,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2022-03-20 18:52:25,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 39 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) [2022-03-20 18:52:25,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2022-03-20 18:52:25,676 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 42 [2022-03-20 18:52:25,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:52:25,676 INFO L478 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2022-03-20 18:52:25,677 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.1875) internal successors, (38), 31 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) [2022-03-20 18:52:25,677 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2022-03-20 18:52:25,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-03-20 18:52:25,677 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:52:25,677 INFO L499 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:52:25,692 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-03-20 18:52:25,877 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:52:25,878 INFO L403 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:52:25,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:52:25,878 INFO L85 PathProgramCache]: Analyzing trace with hash 161684174, now seen corresponding path program 28 times [2022-03-20 18:52:25,878 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:52:25,878 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1637016462] [2022-03-20 18:52:25,967 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:52:25,967 INFO L85 PathProgramCache]: Analyzing trace with hash 241992877, now seen corresponding path program 1 times [2022-03-20 18:52:25,967 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:52:25,967 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575638835] [2022-03-20 18:52:25,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:52:25,967 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:52:25,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:52:29,463 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:52:29,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:52:29,466 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:52:29,466 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:52:29,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575638835] [2022-03-20 18:52:29,466 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [575638835] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:52:29,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2025364568] [2022-03-20 18:52:29,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:52:29,466 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:52:29,466 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:52:29,467 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) [2022-03-20 18:52:29,468 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-03-20 18:52:29,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:52:29,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 53 conjunts are in the unsatisfiable core [2022-03-20 18:52:29,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:52:41,748 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:52:41,749 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:52:55,402 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:52:55,402 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2025364568] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:52:55,402 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:52:55,402 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 80 [2022-03-20 18:53:36,433 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:53:36,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1637016462] [2022-03-20 18:53:36,433 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1637016462] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:53:36,433 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:53:36,433 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-03-20 18:53:36,433 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058579319] [2022-03-20 18:53:36,433 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:53:36,433 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-03-20 18:53:36,433 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:53:36,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-03-20 18:53:36,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=655, Invalid=7354, Unknown=1, NotChecked=0, Total=8010 [2022-03-20 18:53:36,434 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand has 38 states, 38 states have (on average 1.0263157894736843) internal successors, (39), 36 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:54:35,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:54:35,660 INFO L93 Difference]: Finished difference Result 61 states and 64 transitions. [2022-03-20 18:54:35,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-03-20 18:54:35,661 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.0263157894736843) internal successors, (39), 36 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 [2022-03-20 18:54:35,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:54:35,661 INFO L225 Difference]: With dead ends: 61 [2022-03-20 18:54:35,661 INFO L226 Difference]: Without dead ends: 56 [2022-03-20 18:54:35,662 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3099 ImplicationChecksByTransitivity, 116.0s TimeCoverageRelationStatistics Valid=1131, Invalid=14368, Unknown=1, NotChecked=0, Total=15500 [2022-03-20 18:54:35,662 INFO L913 BasicCegarLoop]: 10 mSDtfsCounter, 20 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 1208 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 1230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 1208 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.7s IncrementalHoareTripleChecker+Time [2022-03-20 18:54:35,663 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 162 Invalid, 1230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 1208 Invalid, 0 Unknown, 0 Unchecked, 10.7s Time] [2022-03-20 18:54:35,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-03-20 18:54:35,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 46. [2022-03-20 18:54:35,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.0975609756097562) internal successors, (45), 41 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) [2022-03-20 18:54:35,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2022-03-20 18:54:35,691 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 43 [2022-03-20 18:54:35,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:54:35,691 INFO L478 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2022-03-20 18:54:35,691 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.0263157894736843) internal successors, (39), 36 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:54:35,691 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2022-03-20 18:54:35,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-20 18:54:35,691 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:54:35,691 INFO L499 BasicCegarLoop]: trace histogram [11, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:54:35,697 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-03-20 18:54:35,895 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:54:35,895 INFO L403 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:54:35,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:54:35,895 INFO L85 PathProgramCache]: Analyzing trace with hash 751737183, now seen corresponding path program 29 times [2022-03-20 18:54:35,895 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:54:35,895 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1256753172] [2022-03-20 18:54:36,021 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:54:36,022 INFO L85 PathProgramCache]: Analyzing trace with hash 355175328, now seen corresponding path program 1 times [2022-03-20 18:54:36,022 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:54:36,022 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1531428218] [2022-03-20 18:54:36,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:54:36,022 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:54:36,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:54:37,869 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:54:37,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:54:37,872 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:54:37,872 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:54:37,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1531428218] [2022-03-20 18:54:37,872 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1531428218] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:54:37,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [188436051] [2022-03-20 18:54:37,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:54:37,872 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:54:37,872 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:54:37,873 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) [2022-03-20 18:54:37,874 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-03-20 18:54:37,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:54:37,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 44 conjunts are in the unsatisfiable core [2022-03-20 18:54:37,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:54:38,165 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:54:38,165 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:54:40,818 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:54:40,818 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [188436051] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:54:40,818 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:54:40,818 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 37 [2022-03-20 18:55:01,346 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:55:01,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1256753172] [2022-03-20 18:55:01,347 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1256753172] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:55:01,347 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:55:01,347 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-03-20 18:55:01,347 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2134586001] [2022-03-20 18:55:01,347 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:55:01,347 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-03-20 18:55:01,347 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:55:01,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-03-20 18:55:01,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=1911, Unknown=0, NotChecked=0, Total=2070 [2022-03-20 18:55:01,348 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand has 34 states, 34 states have (on average 1.1764705882352942) internal successors, (40), 33 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:55:53,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:55:53,966 INFO L93 Difference]: Finished difference Result 87 states and 93 transitions. [2022-03-20 18:55:53,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-03-20 18:55:53,967 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.1764705882352942) internal successors, (40), 33 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2022-03-20 18:55:53,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:55:53,967 INFO L225 Difference]: With dead ends: 87 [2022-03-20 18:55:53,967 INFO L226 Difference]: Without dead ends: 46 [2022-03-20 18:55:53,968 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 66 SyntacticMatches, 5 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1219 ImplicationChecksByTransitivity, 71.4s TimeCoverageRelationStatistics Valid=679, Invalid=6977, Unknown=0, NotChecked=0, Total=7656 [2022-03-20 18:55:53,968 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 36 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 942 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 1051 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 942 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:55:53,968 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 133 Invalid, 1051 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 942 Invalid, 0 Unknown, 0 Unchecked, 5.9s Time] [2022-03-20 18:55:53,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-03-20 18:55:53,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2022-03-20 18:55:53,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 41 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) [2022-03-20 18:55:53,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2022-03-20 18:55:53,998 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 44 [2022-03-20 18:55:53,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:55:53,998 INFO L478 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2022-03-20 18:55:53,998 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.1764705882352942) internal successors, (40), 33 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:55:53,998 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2022-03-20 18:55:53,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-03-20 18:55:53,998 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:55:53,998 INFO L499 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:55:54,014 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2022-03-20 18:55:54,199 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:55:54,199 INFO L403 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:55:54,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:55:54,199 INFO L85 PathProgramCache]: Analyzing trace with hash -1633510225, now seen corresponding path program 30 times [2022-03-20 18:55:54,199 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:55:54,199 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1335111387] [2022-03-20 18:55:54,323 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:55:54,324 INFO L85 PathProgramCache]: Analyzing trace with hash -1777327217, now seen corresponding path program 1 times [2022-03-20 18:55:54,324 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:55:54,324 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1785000981] [2022-03-20 18:55:54,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:55:54,324 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:55:54,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:55:56,467 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:55:56,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:55:56,470 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:55:56,470 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:55:56,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1785000981] [2022-03-20 18:55:56,471 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1785000981] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:55:56,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [776271723] [2022-03-20 18:55:56,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:55:56,471 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:55:56,471 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:55:56,472 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) [2022-03-20 18:55:56,472 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-03-20 18:55:56,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:55:56,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 44 conjunts are in the unsatisfiable core [2022-03-20 18:55:56,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:55:56,889 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:55:56,889 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:55:59,492 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:55:59,493 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [776271723] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:55:59,493 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:55:59,493 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 36 [2022-03-20 18:56:29,263 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:56:29,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1335111387] [2022-03-20 18:56:29,263 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1335111387] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:56:29,263 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:56:29,263 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-03-20 18:56:29,264 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511089942] [2022-03-20 18:56:29,264 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:56:29,264 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-03-20 18:56:29,264 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:56:29,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-03-20 18:56:29,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=1914, Unknown=0, NotChecked=0, Total=2070 [2022-03-20 18:56:29,264 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand has 35 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 34 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) [2022-03-20 18:57:06,582 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.00s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:57:34,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:57:34,705 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2022-03-20 18:57:34,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-03-20 18:57:34,706 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 34 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 [2022-03-20 18:57:34,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:57:34,706 INFO L225 Difference]: With dead ends: 52 [2022-03-20 18:57:34,706 INFO L226 Difference]: Without dead ends: 47 [2022-03-20 18:57:34,707 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 880 ImplicationChecksByTransitivity, 85.6s TimeCoverageRelationStatistics Valid=796, Invalid=5366, Unknown=0, NotChecked=0, Total=6162 [2022-03-20 18:57:34,707 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 35 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 682 mSolverCounterSat, 179 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 861 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 179 IncrementalHoareTripleChecker+Valid, 682 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:57:34,707 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 151 Invalid, 861 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [179 Valid, 682 Invalid, 0 Unknown, 0 Unchecked, 14.1s Time] [2022-03-20 18:57:34,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-03-20 18:57:34,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-03-20 18:57:34,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 42 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) [2022-03-20 18:57:34,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2022-03-20 18:57:34,734 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 45 [2022-03-20 18:57:34,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:57:34,734 INFO L478 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2022-03-20 18:57:34,735 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 34 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) [2022-03-20 18:57:34,735 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2022-03-20 18:57:34,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-20 18:57:34,735 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:57:34,735 INFO L499 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:57:34,751 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-03-20 18:57:34,935 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,SelfDestructingSolverStorable32 [2022-03-20 18:57:34,935 INFO L403 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:57:34,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:57:34,936 INFO L85 PathProgramCache]: Analyzing trace with hash 935285662, now seen corresponding path program 31 times [2022-03-20 18:57:34,936 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:57:34,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [990021458] [2022-03-20 18:57:35,064 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:57:35,064 INFO L85 PathProgramCache]: Analyzing trace with hash 1496158334, now seen corresponding path program 1 times [2022-03-20 18:57:35,064 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:57:35,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1662511031] [2022-03-20 18:57:35,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:57:35,065 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:57:35,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:57:40,283 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:57:40,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:57:40,292 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:57:40,292 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:57:40,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1662511031] [2022-03-20 18:57:40,292 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1662511031] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:57:40,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1112507520] [2022-03-20 18:57:40,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:57:40,293 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:57:40,293 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:57:40,294 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) [2022-03-20 18:57:40,294 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-03-20 18:57:40,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:57:40,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 61 conjunts are in the unsatisfiable core [2022-03-20 18:57:40,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:57:49,732 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:57:49,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:58:03,234 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:58:03,234 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1112507520] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:58:03,234 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:58:03,234 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 31] total 86 [2022-03-20 18:58:55,168 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:58:55,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [990021458] [2022-03-20 18:58:55,169 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [990021458] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:58:55,169 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:58:55,169 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-03-20 18:58:55,169 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132919045] [2022-03-20 18:58:55,169 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:58:55,169 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-03-20 18:58:55,169 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:58:55,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-03-20 18:58:55,170 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=798, Invalid=8514, Unknown=0, NotChecked=0, Total=9312 [2022-03-20 18:58:55,170 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand has 41 states, 41 states have (on average 1.024390243902439) internal successors, (42), 39 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)