/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-acceleration/underapprox_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-7390193 [2022-04-04 19:17:52,843 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-04 19:17:52,856 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-04 19:17:52,901 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-04-04 19:17:52,938 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 [2022-04-04 19:17:52,972 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-04 19:17:52,972 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-04 19:17:52,973 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-04-04 19:17:52,973 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-04-04 19:17:52,973 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-04-04 19:17:52,973 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-04-04 19:17:52,974 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-04-04 19:17:52,974 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-04-04 19:17:52,974 INFO L138 SettingsManager]: * Use SBE=true [2022-04-04 19:17:52,975 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-04 19:17:52,975 INFO L138 SettingsManager]: * sizeof long=4 [2022-04-04 19:17:52,975 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-04 19:17:52,975 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-04-04 19:17:52,975 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-04 19:17:52,975 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-04 19:17:52,975 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-04 19:17:52,975 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-04 19:17:52,976 INFO L138 SettingsManager]: * sizeof long double=12 [2022-04-04 19:17:52,977 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-04 19:17:52,977 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-04 19:17:52,977 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-04 19:17:52,977 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-04 19:17:52,977 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-04 19:17:52,977 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-04 19:17:52,977 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-04 19:17:52,977 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-04 19:17:52,978 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-04-04 19:17:52,978 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-04-04 19:17:52,978 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-04-04 19:17:52,978 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-04-04 19:17:52,978 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2022-04-04 19:17:52,978 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-04-04 19:17:52,978 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-04 19:17:52,978 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-04 19:17:53,202 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-04 19:17:53,219 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-04 19:17:53,221 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-04 19:17:53,222 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-04 19:17:53,222 INFO L275 PluginConnector]: CDTParser initialized [2022-04-04 19:17:53,223 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-2.c [2022-04-04 19:17:53,278 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b5dc16da6/cec032a29d214940b77875ea034c05f2/FLAGeae0cfed7 [2022-04-04 19:17:53,686 INFO L306 CDTParser]: Found 1 translation units. [2022-04-04 19:17:53,687 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-2.c [2022-04-04 19:17:53,694 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b5dc16da6/cec032a29d214940b77875ea034c05f2/FLAGeae0cfed7 [2022-04-04 19:17:54,100 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b5dc16da6/cec032a29d214940b77875ea034c05f2 [2022-04-04 19:17:54,102 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-04 19:17:54,103 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-04-04 19:17:54,105 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-04 19:17:54,105 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-04 19:17:54,109 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-04 19:17:54,110 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.04 07:17:54" (1/1) ... [2022-04-04 19:17:54,111 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5d8dbe71 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.04 07:17:54, skipping insertion in model container [2022-04-04 19:17:54,111 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.04 07:17:54" (1/1) ... [2022-04-04 19:17:54,116 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-04 19:17:54,126 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-04 19:17:54,246 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-2.c[327,340] [2022-04-04 19:17:54,256 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-04 19:17:54,267 INFO L203 MainTranslator]: Completed pre-run [2022-04-04 19:17:54,283 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-2.c[327,340] [2022-04-04 19:17:54,285 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-04 19:17:54,294 INFO L208 MainTranslator]: Completed translation [2022-04-04 19:17:54,295 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.04 07:17:54 WrapperNode [2022-04-04 19:17:54,295 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-04 19:17:54,295 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-04 19:17:54,295 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-04 19:17:54,295 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-04 19:17:54,303 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.04 07:17:54" (1/1) ... [2022-04-04 19:17:54,304 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.04 07:17:54" (1/1) ... [2022-04-04 19:17:54,311 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.04 07:17:54" (1/1) ... [2022-04-04 19:17:54,312 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.04 07:17:54" (1/1) ... [2022-04-04 19:17:54,316 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.04 07:17:54" (1/1) ... [2022-04-04 19:17:54,319 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.04 07:17:54" (1/1) ... [2022-04-04 19:17:54,324 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.04 07:17:54" (1/1) ... [2022-04-04 19:17:54,327 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-04 19:17:54,328 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-04 19:17:54,328 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-04 19:17:54,328 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-04 19:17:54,329 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.04 07:17:54" (1/1) ... [2022-04-04 19:17:54,334 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-04 19:17:54,342 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-04 19:17:54,356 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) [2022-04-04 19:17:54,383 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 [2022-04-04 19:17:54,398 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-04 19:17:54,398 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-04 19:17:54,398 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-04 19:17:54,399 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-04 19:17:54,400 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-04 19:17:54,400 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-04 19:17:54,400 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-04 19:17:54,400 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-04 19:17:54,400 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-04 19:17:54,400 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-04 19:17:54,401 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-04 19:17:54,401 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-04 19:17:54,401 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-04 19:17:54,401 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-04 19:17:54,401 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-04 19:17:54,401 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-04 19:17:54,401 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-04 19:17:54,456 INFO L234 CfgBuilder]: Building ICFG [2022-04-04 19:17:54,458 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-04 19:17:54,575 INFO L275 CfgBuilder]: Performing block encoding [2022-04-04 19:17:54,579 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-04 19:17:54,579 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-04-04 19:17:54,580 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.04 07:17:54 BoogieIcfgContainer [2022-04-04 19:17:54,580 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-04 19:17:54,582 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-04 19:17:54,582 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-04 19:17:54,585 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-04 19:17:54,585 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.04 07:17:54" (1/3) ... [2022-04-04 19:17:54,586 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f8a1a0b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.04 07:17:54, skipping insertion in model container [2022-04-04 19:17:54,586 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.04 07:17:54" (2/3) ... [2022-04-04 19:17:54,586 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f8a1a0b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.04 07:17:54, skipping insertion in model container [2022-04-04 19:17:54,586 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.04 07:17:54" (3/3) ... [2022-04-04 19:17:54,587 INFO L111 eAbstractionObserver]: Analyzing ICFG underapprox_1-2.c [2022-04-04 19:17:54,592 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-04-04 19:17:54,592 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-04 19:17:54,643 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-04 19:17:54,650 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 [2022-04-04 19:17:54,651 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-04 19:17:54,677 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-04 19:17:54,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-04-04 19:17:54,681 INFO L491 BasicCegarLoop]: Found error trace [2022-04-04 19:17:54,681 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-04 19:17:54,682 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-04 19:17:54,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-04 19:17:54,687 INFO L85 PathProgramCache]: Analyzing trace with hash -219174432, now seen corresponding path program 1 times [2022-04-04 19:17:54,694 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-04 19:17:54,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [506633884] [2022-04-04 19:17:54,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-04 19:17:54,695 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-04 19:17:54,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-04 19:17:54,851 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-04 19:17:54,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-04 19:17:54,874 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-04 19:17:54,874 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-04 19:17:54,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [506633884] [2022-04-04 19:17:54,875 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [506633884] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-04 19:17:54,875 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-04 19:17:54,876 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-04 19:17:54,877 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495746962] [2022-04-04 19:17:54,877 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-04 19:17:54,880 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-04-04 19:17:54,881 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-04 19:17:54,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-04-04 19:17:54,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-04 19:17:54,933 INFO L87 Difference]: Start difference. First operand has 18 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-04 19:17:54,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-04 19:17:54,974 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2022-04-04 19:17:54,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-04-04 19:17:54,978 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-04-04 19:17:54,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-04 19:17:54,982 INFO L225 Difference]: With dead ends: 29 [2022-04-04 19:17:54,983 INFO L226 Difference]: Without dead ends: 12 [2022-04-04 19:17:54,985 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-04 19:17:54,991 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 9 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-04 19:17:54,992 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 20 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-04 19:17:55,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2022-04-04 19:17:55,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2022-04-04 19:17:55,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-04 19:17:55,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2022-04-04 19:17:55,022 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 11 [2022-04-04 19:17:55,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-04 19:17:55,022 INFO L478 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2022-04-04 19:17:55,022 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-04 19:17:55,022 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2022-04-04 19:17:55,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-04-04 19:17:55,023 INFO L491 BasicCegarLoop]: Found error trace [2022-04-04 19:17:55,023 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-04 19:17:55,023 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-04 19:17:55,024 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-04 19:17:55,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-04 19:17:55,027 INFO L85 PathProgramCache]: Analyzing trace with hash -222868516, now seen corresponding path program 1 times [2022-04-04 19:17:55,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-04 19:17:55,028 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [422486845] [2022-04-04 19:17:55,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-04 19:17:55,028 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-04 19:17:55,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-04 19:17:55,121 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-04 19:17:55,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-04 19:17:55,136 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-04 19:17:55,137 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-04 19:17:55,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [422486845] [2022-04-04 19:17:55,137 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [422486845] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-04 19:17:55,137 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-04 19:17:55,137 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-04-04 19:17:55,137 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630190003] [2022-04-04 19:17:55,138 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-04 19:17:55,138 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-04-04 19:17:55,139 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-04 19:17:55,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-04-04 19:17:55,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-04-04 19:17:55,139 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-04 19:17:55,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-04 19:17:55,173 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2022-04-04 19:17:55,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-04-04 19:17:55,174 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-04-04 19:17:55,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-04 19:17:55,175 INFO L225 Difference]: With dead ends: 18 [2022-04-04 19:17:55,175 INFO L226 Difference]: Without dead ends: 13 [2022-04-04 19:17:55,175 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-04-04 19:17:55,176 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-04 19:17:55,177 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 18 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-04 19:17:55,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-04-04 19:17:55,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-04-04 19:17:55,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-04 19:17:55,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2022-04-04 19:17:55,181 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2022-04-04 19:17:55,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-04 19:17:55,181 INFO L478 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2022-04-04 19:17:55,181 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-04 19:17:55,181 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2022-04-04 19:17:55,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-04-04 19:17:55,182 INFO L491 BasicCegarLoop]: Found error trace [2022-04-04 19:17:55,182 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-04 19:17:55,182 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-04-04 19:17:55,182 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-04 19:17:55,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-04 19:17:55,183 INFO L85 PathProgramCache]: Analyzing trace with hash 1717471862, now seen corresponding path program 1 times [2022-04-04 19:17:55,183 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-04 19:17:55,183 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [189990555] [2022-04-04 19:17:55,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-04 19:17:55,183 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-04 19:17:55,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-04 19:17:55,248 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-04 19:17:55,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-04 19:17:55,255 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-04 19:17:55,255 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-04 19:17:55,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [189990555] [2022-04-04 19:17:55,256 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [189990555] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-04 19:17:55,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [110812637] [2022-04-04 19:17:55,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-04 19:17:55,256 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-04 19:17:55,256 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-04 19:17:55,258 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) [2022-04-04 19:17:55,259 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-04-04 19:17:55,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-04 19:17:55,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 5 conjunts are in the unsatisfiable core [2022-04-04 19:17:55,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-04 19:17:55,342 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-04 19:17:55,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-04 19:17:55,386 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-04 19:17:55,386 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [110812637] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-04 19:17:55,386 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-04 19:17:55,386 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 8 [2022-04-04 19:17:55,386 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536167477] [2022-04-04 19:17:55,387 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-04 19:17:55,387 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-04-04 19:17:55,387 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-04 19:17:55,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-04-04 19:17:55,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2022-04-04 19:17:55,388 INFO L87 Difference]: Start difference. First operand 13 states and 13 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, (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) [2022-04-04 19:17:55,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-04 19:17:55,452 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2022-04-04 19:17:55,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-04-04 19:17:55,453 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, (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 12 [2022-04-04 19:17:55,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-04 19:17:55,453 INFO L225 Difference]: With dead ends: 21 [2022-04-04 19:17:55,453 INFO L226 Difference]: Without dead ends: 16 [2022-04-04 19:17:55,454 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2022-04-04 19:17:55,455 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-04 19:17:55,455 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 33 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-04 19:17:55,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-04-04 19:17:55,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-04-04 19:17:55,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 11 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-04 19:17:55,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2022-04-04 19:17:55,459 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 12 [2022-04-04 19:17:55,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-04 19:17:55,460 INFO L478 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2022-04-04 19:17:55,460 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, (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) [2022-04-04 19:17:55,460 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2022-04-04 19:17:55,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-04-04 19:17:55,460 INFO L491 BasicCegarLoop]: Found error trace [2022-04-04 19:17:55,460 INFO L499 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-04 19:17:55,487 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-04-04 19:17:55,687 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 [2022-04-04 19:17:55,688 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-04 19:17:55,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-04 19:17:55,688 INFO L85 PathProgramCache]: Analyzing trace with hash 1105142364, now seen corresponding path program 2 times [2022-04-04 19:17:55,689 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-04 19:17:55,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [57922627] [2022-04-04 19:17:55,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-04 19:17:55,689 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-04 19:17:55,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-04 19:17:55,864 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-04 19:17:55,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-04 19:17:55,874 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-04 19:17:55,874 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-04 19:17:55,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [57922627] [2022-04-04 19:17:55,874 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [57922627] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-04 19:17:55,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2079572049] [2022-04-04 19:17:55,875 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-04 19:17:55,875 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-04 19:17:55,875 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-04 19:17:55,880 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) [2022-04-04 19:17:55,890 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-04-04 19:17:55,923 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-04 19:17:55,923 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-04 19:17:55,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 11 conjunts are in the unsatisfiable core [2022-04-04 19:17:55,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-04 19:17:55,998 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-04 19:17:55,999 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-04 19:17:56,108 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-04 19:17:56,108 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2079572049] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-04 19:17:56,108 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-04 19:17:56,108 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 14 [2022-04-04 19:17:56,109 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315966710] [2022-04-04 19:17:56,109 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-04 19:17:56,109 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-04-04 19:17:56,109 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-04 19:17:56,110 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-04-04 19:17:56,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2022-04-04 19:17:56,111 INFO L87 Difference]: Start difference. First operand 16 states and 16 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, (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) [2022-04-04 19:17:58,239 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-04 19:18:00,386 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-04 19:18:00,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-04 19:18:00,582 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2022-04-04 19:18:00,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-04-04 19:18:00,582 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, (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 15 [2022-04-04 19:18:00,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-04 19:18:00,583 INFO L225 Difference]: With dead ends: 23 [2022-04-04 19:18:00,583 INFO L226 Difference]: Without dead ends: 18 [2022-04-04 19:18:00,584 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=104, Invalid=276, Unknown=0, NotChecked=0, Total=380 [2022-04-04 19:18:00,585 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 15 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2022-04-04 19:18:00,585 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 48 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 66 Invalid, 2 Unknown, 0 Unchecked, 4.4s Time] [2022-04-04 19:18:00,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-04-04 19:18:00,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-04-04 19:18:00,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.0769230769230769) internal successors, (14), 13 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-04 19:18:00,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2022-04-04 19:18:00,590 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2022-04-04 19:18:00,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-04 19:18:00,590 INFO L478 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2022-04-04 19:18:00,590 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, (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) [2022-04-04 19:18:00,590 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2022-04-04 19:18:00,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-04-04 19:18:00,591 INFO L491 BasicCegarLoop]: Found error trace [2022-04-04 19:18:00,595 INFO L499 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-04 19:18:00,619 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-04-04 19:18:00,814 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 [2022-04-04 19:18:00,815 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-04 19:18:00,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-04 19:18:00,816 INFO L85 PathProgramCache]: Analyzing trace with hash -1943317092, now seen corresponding path program 3 times [2022-04-04 19:18:00,816 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-04 19:18:00,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1876847702] [2022-04-04 19:18:00,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-04 19:18:00,816 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-04 19:18:00,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-04 19:18:03,336 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-04 19:18:03,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-04 19:18:03,352 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-04 19:18:03,352 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-04 19:18:03,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1876847702] [2022-04-04 19:18:03,352 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1876847702] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-04 19:18:03,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [28551092] [2022-04-04 19:18:03,353 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-04-04 19:18:03,353 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-04 19:18:03,353 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-04 19:18:03,354 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) [2022-04-04 19:18:03,367 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process