/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-new/nested-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-34549b5 [2022-04-05 23:53:53,430 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-05 23:53:53,432 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-05 23:53:53,454 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-04-05 23:53:53,483 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2022-04-05 23:53:53,500 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-05 23:53:53,501 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-05 23:53:53,501 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-04-05 23:53:53,501 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-04-05 23:53:53,502 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-04-05 23:53:53,502 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-04-05 23:53:53,502 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-04-05 23:53:53,502 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-04-05 23:53:53,503 INFO L138 SettingsManager]: * Use SBE=true [2022-04-05 23:53:53,503 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-05 23:53:53,503 INFO L138 SettingsManager]: * sizeof long=4 [2022-04-05 23:53:53,503 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-05 23:53:53,503 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-04-05 23:53:53,503 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-05 23:53:53,503 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-05 23:53:53,504 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-05 23:53:53,504 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-05 23:53:53,504 INFO L138 SettingsManager]: * sizeof long double=12 [2022-04-05 23:53:53,504 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-05 23:53:53,504 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-05 23:53:53,504 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-05 23:53:53,504 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-05 23:53:53,505 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-05 23:53:53,505 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-05 23:53:53,505 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-05 23:53:53,505 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-05 23:53:53,505 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-04-05 23:53:53,505 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-04-05 23:53:53,506 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-04-05 23:53:53,506 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-04-05 23:53:53,506 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2022-04-05 23:53:53,506 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-04-05 23:53:53,506 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-05 23:53:53,506 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-05 23:53:53,721 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-05 23:53:53,742 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-05 23:53:53,744 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-05 23:53:53,745 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-05 23:53:53,746 INFO L275 PluginConnector]: CDTParser initialized [2022-04-05 23:53:53,747 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-new/nested-1.i [2022-04-05 23:53:53,810 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2d44e2f5e/e6a726027eb54ed8bf1aeebe25110374/FLAG8550147cd [2022-04-05 23:53:54,154 INFO L306 CDTParser]: Found 1 translation units. [2022-04-05 23:53:54,155 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/nested-1.i [2022-04-05 23:53:54,162 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2d44e2f5e/e6a726027eb54ed8bf1aeebe25110374/FLAG8550147cd [2022-04-05 23:53:54,559 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2d44e2f5e/e6a726027eb54ed8bf1aeebe25110374 [2022-04-05 23:53:54,561 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-05 23:53:54,562 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-04-05 23:53:54,564 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-05 23:53:54,564 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-05 23:53:54,567 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-05 23:53:54,567 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.04 11:53:54" (1/1) ... [2022-04-05 23:53:54,568 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3773abd6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 11:53:54, skipping insertion in model container [2022-04-05 23:53:54,569 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.04 11:53:54" (1/1) ... [2022-04-05 23:53:54,574 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-05 23:53:54,585 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-05 23:53:54,727 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-new/nested-1.i[891,904] [2022-04-05 23:53:54,739 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-05 23:53:54,744 INFO L203 MainTranslator]: Completed pre-run [2022-04-05 23:53:54,759 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-new/nested-1.i[891,904] [2022-04-05 23:53:54,769 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-05 23:53:54,781 INFO L208 MainTranslator]: Completed translation [2022-04-05 23:53:54,782 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 11:53:54 WrapperNode [2022-04-05 23:53:54,782 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-05 23:53:54,783 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-05 23:53:54,783 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-05 23:53:54,783 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-05 23:53:54,792 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 11:53:54" (1/1) ... [2022-04-05 23:53:54,792 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 11:53:54" (1/1) ... [2022-04-05 23:53:54,798 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 11:53:54" (1/1) ... [2022-04-05 23:53:54,798 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 11:53:54" (1/1) ... [2022-04-05 23:53:54,807 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 11:53:54" (1/1) ... [2022-04-05 23:53:54,813 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 11:53:54" (1/1) ... [2022-04-05 23:53:54,814 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 11:53:54" (1/1) ... [2022-04-05 23:53:54,816 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-05 23:53:54,816 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-05 23:53:54,816 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-05 23:53:54,816 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-05 23:53:54,817 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 11:53:54" (1/1) ... [2022-04-05 23:53:54,829 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-05 23:53:54,839 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 23:53:54,852 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) [2022-04-05 23:53:54,873 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 [2022-04-05 23:53:54,896 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-05 23:53:54,896 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-05 23:53:54,896 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-05 23:53:54,897 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-04-05 23:53:54,899 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-05 23:53:54,899 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-05 23:53:54,899 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-05 23:53:54,899 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-05 23:53:54,900 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2022-04-05 23:53:54,900 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2022-04-05 23:53:54,900 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-05 23:53:54,900 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-05 23:53:54,900 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-04-05 23:53:54,900 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-05 23:53:54,900 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-04-05 23:53:54,901 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-05 23:53:54,901 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-05 23:53:54,901 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-05 23:53:54,901 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-05 23:53:54,901 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-05 23:53:54,901 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-05 23:53:54,901 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-05 23:53:54,985 INFO L234 CfgBuilder]: Building ICFG [2022-04-05 23:53:54,987 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-05 23:53:55,093 INFO L275 CfgBuilder]: Performing block encoding [2022-04-05 23:53:55,098 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-05 23:53:55,098 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-04-05 23:53:55,100 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.04 11:53:55 BoogieIcfgContainer [2022-04-05 23:53:55,100 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-05 23:53:55,101 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-05 23:53:55,102 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-05 23:53:55,104 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-05 23:53:55,105 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 05.04 11:53:54" (1/3) ... [2022-04-05 23:53:55,105 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a11be8c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.04 11:53:55, skipping insertion in model container [2022-04-05 23:53:55,105 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 11:53:54" (2/3) ... [2022-04-05 23:53:55,106 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a11be8c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.04 11:53:55, skipping insertion in model container [2022-04-05 23:53:55,106 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.04 11:53:55" (3/3) ... [2022-04-05 23:53:55,107 INFO L111 eAbstractionObserver]: Analyzing ICFG nested-1.i [2022-04-05 23:53:55,111 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-04-05 23:53:55,111 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-05 23:53:55,147 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-05 23:53:55,152 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-04-05 23:53:55,152 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-05 23:53:55,183 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 16 states have (on average 1.5) internal successors, (24), 17 states have internal predecessors, (24), 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) [2022-04-05 23:53:55,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-04-05 23:53:55,187 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 23:53:55,187 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 23:53:55,188 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 23:53:55,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 23:53:55,192 INFO L85 PathProgramCache]: Analyzing trace with hash 486387592, now seen corresponding path program 1 times [2022-04-05 23:53:55,198 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 23:53:55,199 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1358746648] [2022-04-05 23:53:55,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 23:53:55,200 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 23:53:55,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 23:53:55,356 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 23:53:55,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 23:53:55,366 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-05 23:53:55,367 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 23:53:55,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1358746648] [2022-04-05 23:53:55,368 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1358746648] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-05 23:53:55,368 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-05 23:53:55,368 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-05 23:53:55,369 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [209590621] [2022-04-05 23:53:55,370 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 23:53:55,373 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-05 23:53:55,373 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 23:53:55,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-05 23:53:55,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-04-05 23:53:55,395 INFO L87 Difference]: Start difference. First operand has 24 states, 16 states have (on average 1.5) internal successors, (24), 17 states have internal predecessors, (24), 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 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 23:53:55,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 23:53:55,522 INFO L93 Difference]: Finished difference Result 46 states and 61 transitions. [2022-04-05 23:53:55,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-05 23:53:55,525 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2022-04-05 23:53:55,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 23:53:55,533 INFO L225 Difference]: With dead ends: 46 [2022-04-05 23:53:55,533 INFO L226 Difference]: Without dead ends: 21 [2022-04-05 23:53:55,536 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2022-04-05 23:53:55,539 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 36 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-05 23:53:55,540 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 40 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-05 23:53:55,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-04-05 23:53:55,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2022-04-05 23:53:55,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 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) [2022-04-05 23:53:55,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2022-04-05 23:53:55,567 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2022-04-05 23:53:55,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 23:53:55,567 INFO L478 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2022-04-05 23:53:55,567 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 23:53:55,568 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2022-04-05 23:53:55,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-04-05 23:53:55,568 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 23:53:55,568 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 23:53:55,569 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-05 23:53:55,569 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 23:53:55,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 23:53:55,570 INFO L85 PathProgramCache]: Analyzing trace with hash 123963385, now seen corresponding path program 1 times [2022-04-05 23:53:55,570 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 23:53:55,570 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [588346232] [2022-04-05 23:53:55,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 23:53:55,571 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 23:53:55,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 23:53:55,616 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 23:53:55,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 23:53:55,631 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-05 23:53:55,631 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 23:53:55,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [588346232] [2022-04-05 23:53:55,632 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [588346232] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-05 23:53:55,632 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-05 23:53:55,632 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-05 23:53:55,635 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759565746] [2022-04-05 23:53:55,635 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 23:53:55,642 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-05 23:53:55,643 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 23:53:55,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-05 23:53:55,643 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-04-05 23:53:55,644 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 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) [2022-04-05 23:53:55,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 23:53:55,705 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2022-04-05 23:53:55,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-05 23:53:55,706 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 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 [2022-04-05 23:53:55,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 23:53:55,706 INFO L225 Difference]: With dead ends: 29 [2022-04-05 23:53:55,706 INFO L226 Difference]: Without dead ends: 20 [2022-04-05 23:53:55,707 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2022-04-05 23:53:55,708 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 20 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-05 23:53:55,709 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 27 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-05 23:53:55,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-04-05 23:53:55,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2022-04-05 23:53:55,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 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) [2022-04-05 23:53:55,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2022-04-05 23:53:55,714 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 16 [2022-04-05 23:53:55,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 23:53:55,715 INFO L478 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2022-04-05 23:53:55,715 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 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) [2022-04-05 23:53:55,715 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2022-04-05 23:53:55,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-04-05 23:53:55,716 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 23:53:55,716 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 23:53:55,716 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-04-05 23:53:55,716 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 23:53:55,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 23:53:55,717 INFO L85 PathProgramCache]: Analyzing trace with hash -1005518441, now seen corresponding path program 1 times [2022-04-05 23:53:55,717 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 23:53:55,717 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608203974] [2022-04-05 23:53:55,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 23:53:55,717 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 23:53:55,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 23:53:55,785 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 23:53:55,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 23:53:55,792 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-05 23:53:55,792 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 23:53:55,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1608203974] [2022-04-05 23:53:55,792 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1608203974] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 23:53:55,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1825241337] [2022-04-05 23:53:55,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 23:53:55,793 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 23:53:55,793 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 23:53:55,794 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) [2022-04-05 23:53:55,840 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-04-05 23:53:55,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 23:53:55,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 4 conjunts are in the unsatisfiable core [2022-04-05 23:53:55,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 23:53:55,942 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-05 23:53:55,943 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 23:53:56,001 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-05 23:53:56,001 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1825241337] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 23:53:56,001 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 23:53:56,001 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 11 [2022-04-05 23:53:56,002 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725296974] [2022-04-05 23:53:56,002 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 23:53:56,002 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-04-05 23:53:56,002 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 23:53:56,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-04-05 23:53:56,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2022-04-05 23:53:56,003 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 23:53:56,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 23:53:56,094 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2022-04-05 23:53:56,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-05 23:53:56,095 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2022-04-05 23:53:56,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 23:53:56,096 INFO L225 Difference]: With dead ends: 35 [2022-04-05 23:53:56,096 INFO L226 Difference]: Without dead ends: 25 [2022-04-05 23:53:56,096 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=89, Invalid=151, Unknown=0, NotChecked=0, Total=240 [2022-04-05 23:53:56,098 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 31 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-05 23:53:56,098 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 37 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-05 23:53:56,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-04-05 23:53:56,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-04-05 23:53:56,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.1) internal successors, (22), 20 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 23:53:56,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2022-04-05 23:53:56,104 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 18 [2022-04-05 23:53:56,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 23:53:56,104 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2022-04-05 23:53:56,104 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 23:53:56,104 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2022-04-05 23:53:56,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-04-05 23:53:56,105 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 23:53:56,105 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 23:53:56,131 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-04-05 23:53:56,321 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 23:53:56,322 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 23:53:56,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 23:53:56,323 INFO L85 PathProgramCache]: Analyzing trace with hash -1706471055, now seen corresponding path program 2 times [2022-04-05 23:53:56,323 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 23:53:56,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [423032699] [2022-04-05 23:53:56,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 23:53:56,323 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 23:53:56,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 23:53:56,427 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 23:53:56,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 23:53:56,444 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-05 23:53:56,444 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 23:53:56,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [423032699] [2022-04-05 23:53:56,444 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [423032699] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 23:53:56,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1001040484] [2022-04-05 23:53:56,460 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-05 23:53:56,460 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 23:53:56,460 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 23:53:56,462 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) [2022-04-05 23:53:56,463 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-04-05 23:53:56,507 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-05 23:53:56,508 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 23:53:56,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 4 conjunts are in the unsatisfiable core [2022-04-05 23:53:56,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 23:53:56,623 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-05 23:53:56,623 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 23:53:56,696 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-05 23:53:56,697 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1001040484] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 23:53:56,697 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 23:53:56,697 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 5, 5] total 15 [2022-04-05 23:53:56,697 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [784777996] [2022-04-05 23:53:56,697 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 23:53:56,698 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-04-05 23:53:56,700 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 23:53:56,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-04-05 23:53:56,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2022-04-05 23:53:56,702 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand has 15 states, 15 states have (on average 2.466666666666667) internal successors, (37), 14 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 23:53:57,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 23:53:57,247 INFO L93 Difference]: Finished difference Result 86 states and 98 transitions. [2022-04-05 23:53:57,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-04-05 23:53:57,247 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.466666666666667) internal successors, (37), 14 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2022-04-05 23:53:57,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 23:53:57,251 INFO L225 Difference]: With dead ends: 86 [2022-04-05 23:53:57,251 INFO L226 Difference]: Without dead ends: 70 [2022-04-05 23:53:57,255 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 381 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=559, Invalid=1081, Unknown=0, NotChecked=0, Total=1640 [2022-04-05 23:53:57,258 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 158 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-05 23:53:57,259 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [158 Valid, 54 Invalid, 186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-05 23:53:57,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-04-05 23:53:57,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 66. [2022-04-05 23:53:57,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 61 states have (on average 1.0819672131147542) internal successors, (66), 61 states have internal predecessors, (66), 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) [2022-04-05 23:53:57,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 70 transitions. [2022-04-05 23:53:57,281 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 70 transitions. Word has length 24 [2022-04-05 23:53:57,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 23:53:57,282 INFO L478 AbstractCegarLoop]: Abstraction has 66 states and 70 transitions. [2022-04-05 23:53:57,282 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.466666666666667) internal successors, (37), 14 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 23:53:57,282 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 70 transitions. [2022-04-05 23:53:57,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-04-05 23:53:57,286 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 23:53:57,287 INFO L499 BasicCegarLoop]: trace histogram [20, 20, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 23:53:57,314 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-04-05 23:53:57,506 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2022-04-05 23:53:57,506 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 23:53:57,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 23:53:57,507 INFO L85 PathProgramCache]: Analyzing trace with hash -886890936, now seen corresponding path program 3 times [2022-04-05 23:53:57,507 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 23:53:57,507 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1208415774] [2022-04-05 23:53:57,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 23:53:57,508 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 23:53:57,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 23:53:57,650 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 23:53:57,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 23:53:57,657 INFO L134 CoverageAnalysis]: Checked inductivity of 482 backedges. 187 proven. 25 refuted. 0 times theorem prover too weak. 270 trivial. 0 not checked. [2022-04-05 23:53:57,657 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 23:53:57,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1208415774] [2022-04-05 23:53:57,657 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1208415774] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 23:53:57,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2124388202] [2022-04-05 23:53:57,658 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-04-05 23:53:57,658 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 23:53:57,658 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 23:53:57,659 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) [2022-04-05 23:53:57,699 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-04-05 23:53:57,725 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2022-04-05 23:53:57,725 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 23:53:57,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 8 conjunts are in the unsatisfiable core [2022-04-05 23:53:57,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 23:53:57,933 INFO L134 CoverageAnalysis]: Checked inductivity of 482 backedges. 190 proven. 25 refuted. 0 times theorem prover too weak. 267 trivial. 0 not checked. [2022-04-05 23:53:57,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 23:53:58,101 INFO L134 CoverageAnalysis]: Checked inductivity of 482 backedges. 7 proven. 208 refuted. 0 times theorem prover too weak. 267 trivial. 0 not checked. [2022-04-05 23:53:58,101 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2124388202] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 23:53:58,102 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 23:53:58,102 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 21 [2022-04-05 23:53:58,102 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1253108377] [2022-04-05 23:53:58,103 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 23:53:58,104 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-04-05 23:53:58,104 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 23:53:58,105 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-04-05 23:53:58,105 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=256, Unknown=0, NotChecked=0, Total=420 [2022-04-05 23:53:58,106 INFO L87 Difference]: Start difference. First operand 66 states and 70 transitions. Second operand has 21 states, 21 states have (on average 2.857142857142857) internal successors, (60), 20 states have internal predecessors, (60), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 23:53:58,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 23:53:58,290 INFO L93 Difference]: Finished difference Result 152 states and 179 transitions. [2022-04-05 23:53:58,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-04-05 23:53:58,290 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.857142857142857) internal successors, (60), 20 states have internal predecessors, (60), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2022-04-05 23:53:58,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 23:53:58,291 INFO L225 Difference]: With dead ends: 152 [2022-04-05 23:53:58,291 INFO L226 Difference]: Without dead ends: 106 [2022-04-05 23:53:58,292 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 120 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=350, Invalid=642, Unknown=0, NotChecked=0, Total=992 [2022-04-05 23:53:58,293 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 33 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-05 23:53:58,293 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 37 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-05 23:53:58,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-04-05 23:53:58,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2022-04-05 23:53:58,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 101 states have (on average 1.0495049504950495) internal successors, (106), 101 states have internal predecessors, (106), 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) [2022-04-05 23:53:58,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 110 transitions. [2022-04-05 23:53:58,317 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 110 transitions. Word has length 65 [2022-04-05 23:53:58,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 23:53:58,317 INFO L478 AbstractCegarLoop]: Abstraction has 106 states and 110 transitions. [2022-04-05 23:53:58,317 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.857142857142857) internal successors, (60), 20 states have internal predecessors, (60), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 23:53:58,317 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 110 transitions. [2022-04-05 23:53:58,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2022-04-05 23:53:58,318 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 23:53:58,319 INFO L499 BasicCegarLoop]: trace histogram [40, 40, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 23:53:58,341 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-04-05 23:53:58,539 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 23:53:58,540 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 23:53:58,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 23:53:58,540 INFO L85 PathProgramCache]: Analyzing trace with hash -566860216, now seen corresponding path program 4 times [2022-04-05 23:53:58,540 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 23:53:58,540 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [175819998] [2022-04-05 23:53:58,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 23:53:58,541 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 23:53:58,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 23:53:58,726 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 23:53:58,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 23:53:58,731 INFO L134 CoverageAnalysis]: Checked inductivity of 1742 backedges. 0 proven. 1342 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2022-04-05 23:53:58,731 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 23:53:58,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [175819998] [2022-04-05 23:53:58,732 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [175819998] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 23:53:58,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1165672290] [2022-04-05 23:53:58,732 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-05 23:53:58,732 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 23:53:58,732 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 23:53:58,733 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) [2022-04-05 23:53:58,735 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-04-05 23:53:58,802 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-05 23:53:58,803 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 23:53:58,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-05 23:53:58,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 23:53:59,211 INFO L134 CoverageAnalysis]: Checked inductivity of 1742 backedges. 0 proven. 1342 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2022-04-05 23:53:59,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 23:53:59,463 INFO L134 CoverageAnalysis]: Checked inductivity of 1742 backedges. 0 proven. 1342 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2022-04-05 23:53:59,463 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1165672290] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 23:53:59,463 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 23:53:59,463 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 20 [2022-04-05 23:53:59,464 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739974414] [2022-04-05 23:53:59,464 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 23:53:59,466 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-04-05 23:53:59,466 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 23:53:59,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-04-05 23:53:59,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=231, Unknown=0, NotChecked=0, Total=380 [2022-04-05 23:53:59,466 INFO L87 Difference]: Start difference. First operand 106 states and 110 transitions. Second operand has 20 states, 20 states have (on average 3.75) internal successors, (75), 19 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 23:53:59,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 23:53:59,684 INFO L93 Difference]: Finished difference Result 249 states and 264 transitions. [2022-04-05 23:53:59,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-04-05 23:53:59,685 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.75) internal successors, (75), 19 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 105 [2022-04-05 23:53:59,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 23:53:59,689 INFO L225 Difference]: With dead ends: 249 [2022-04-05 23:53:59,689 INFO L226 Difference]: Without dead ends: 244 [2022-04-05 23:53:59,689 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 201 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=329, Invalid=601, Unknown=0, NotChecked=0, Total=930 [2022-04-05 23:53:59,690 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 153 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 153 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-05 23:53:59,691 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [153 Valid, 42 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-05 23:53:59,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2022-04-05 23:53:59,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 244. [2022-04-05 23:53:59,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 239 states have (on average 1.0460251046025104) internal successors, (250), 239 states have internal predecessors, (250), 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) [2022-04-05 23:53:59,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 254 transitions. [2022-04-05 23:53:59,750 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 254 transitions. Word has length 105 [2022-04-05 23:53:59,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 23:53:59,752 INFO L478 AbstractCegarLoop]: Abstraction has 244 states and 254 transitions. [2022-04-05 23:53:59,752 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.75) internal successors, (75), 19 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 23:53:59,752 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 254 transitions. [2022-04-05 23:53:59,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2022-04-05 23:53:59,762 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 23:53:59,762 INFO L499 BasicCegarLoop]: trace histogram [100, 100, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 23:53:59,787 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-04-05 23:53:59,963 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 23:53:59,963 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 23:53:59,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 23:53:59,964 INFO L85 PathProgramCache]: Analyzing trace with hash 1991912552, now seen corresponding path program 5 times [2022-04-05 23:53:59,964 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 23:53:59,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1242712555] [2022-04-05 23:53:59,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 23:53:59,964 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 23:54:00,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 23:54:03,893 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 23:54:03,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 23:54:03,907 INFO L134 CoverageAnalysis]: Checked inductivity of 11045 backedges. 10917 proven. 119 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-04-05 23:54:03,907 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 23:54:03,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1242712555] [2022-04-05 23:54:03,907 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1242712555] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 23:54:03,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1166698635] [2022-04-05 23:54:03,908 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-04-05 23:54:03,908 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 23:54:03,908 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 23:54:03,909 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) [2022-04-05 23:54:03,919 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-04-05 23:54:04,110 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 81 check-sat command(s) [2022-04-05 23:54:04,110 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 23:54:04,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 621 conjuncts, 104 conjunts are in the unsatisfiable core [2022-04-05 23:54:04,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 23:54:04,701 INFO L134 CoverageAnalysis]: Checked inductivity of 11045 backedges. 11036 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-04-05 23:54:04,701 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-05 23:54:04,701 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1166698635] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-05 23:54:04,702 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-04-05 23:54:04,702 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [105] imperfect sequences [106] total 109 [2022-04-05 23:54:04,702 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94585542] [2022-04-05 23:54:04,702 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 23:54:04,703 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 105 states [2022-04-05 23:54:04,703 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 23:54:04,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2022-04-05 23:54:04,707 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5268, Invalid=6504, Unknown=0, NotChecked=0, Total=11772 [2022-04-05 23:54:04,708 INFO L87 Difference]: Start difference. First operand 244 states and 254 transitions. Second operand has 105 states, 105 states have (on average 2.276190476190476) internal successors, (239), 104 states have internal predecessors, (239), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 23:54:06,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 23:54:06,041 INFO L93 Difference]: Finished difference Result 9784 states and 10244 transitions. [2022-04-05 23:54:06,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2022-04-05 23:54:06,041 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 105 states have (on average 2.276190476190476) internal successors, (239), 104 states have internal predecessors, (239), 2 states have call successors, (3), 2 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 243 [2022-04-05 23:54:06,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 23:54:06,042 INFO L225 Difference]: With dead ends: 9784 [2022-04-05 23:54:06,042 INFO L226 Difference]: Without dead ends: 0 [2022-04-05 23:54:06,059 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 242 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 795 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=5274, Invalid=6716, Unknown=0, NotChecked=0, Total=11990 [2022-04-05 23:54:06,060 INFO L913 BasicCegarLoop]: 384 mSDtfsCounter, 260 mSDsluCounter, 2406 mSDsCounter, 0 mSdLazyCounter, 758 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 260 SdHoareTripleChecker+Valid, 2790 SdHoareTripleChecker+Invalid, 759 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 758 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-05 23:54:06,060 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [260 Valid, 2790 Invalid, 759 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 758 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-05 23:54:06,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2022-04-05 23:54:06,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2022-04-05 23:54:06,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-04-05 23:54:06,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2022-04-05 23:54:06,061 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 243 [2022-04-05 23:54:06,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 23:54:06,061 INFO L478 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2022-04-05 23:54:06,062 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 105 states, 105 states have (on average 2.276190476190476) internal successors, (239), 104 states have internal predecessors, (239), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 23:54:06,062 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2022-04-05 23:54:06,062 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2022-04-05 23:54:06,064 INFO L788 garLoopResultBuilder]: Registering result SAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-04-05 23:54:06,091 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-04-05 23:54:06,283 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 23:54:06,285 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions.