/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/in-de20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-5d317bd [2022-03-18 12:32:23,852 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-18 12:32:23,855 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-18 12:32:23,880 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-03-18 12:32:23,881 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-03-18 12:32:23,881 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-03-18 12:32:23,883 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-03-18 12:32:23,884 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-03-18 12:32:23,885 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-03-18 12:32:23,886 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-03-18 12:32:23,887 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-03-18 12:32:23,889 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-03-18 12:32:23,889 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-03-18 12:32:23,893 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-03-18 12:32:23,893 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-03-18 12:32:23,894 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-03-18 12:32:23,895 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-03-18 12:32:23,896 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-03-18 12:32:23,897 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-03-18 12:32:23,898 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-03-18 12:32:23,899 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-03-18 12:32:23,903 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-03-18 12:32:23,904 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-03-18 12:32:23,905 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-03-18 12:32:23,906 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-03-18 12:32:23,908 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-03-18 12:32:23,908 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-03-18 12:32:23,908 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-03-18 12:32:23,909 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-03-18 12:32:23,909 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-03-18 12:32:23,910 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-03-18 12:32:23,910 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-03-18 12:32:23,911 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-03-18 12:32:23,911 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-03-18 12:32:23,912 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-03-18 12:32:23,913 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-03-18 12:32:23,913 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-03-18 12:32:23,913 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-03-18 12:32:23,914 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-03-18 12:32:23,914 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-18 12:32:23,915 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-18 12:32:23,923 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-18 12:32:23,923 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 [2022-03-18 12:32:23,952 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-18 12:32:23,953 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-18 12:32:23,953 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-03-18 12:32:23,953 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-03-18 12:32:23,954 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-03-18 12:32:23,954 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-03-18 12:32:23,954 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-03-18 12:32:23,954 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-03-18 12:32:23,954 INFO L138 SettingsManager]: * Use SBE=true [2022-03-18 12:32:23,955 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-18 12:32:23,955 INFO L138 SettingsManager]: * sizeof long=4 [2022-03-18 12:32:23,955 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-18 12:32:23,955 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-03-18 12:32:23,956 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-18 12:32:23,956 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-18 12:32:23,956 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-18 12:32:23,956 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-18 12:32:23,957 INFO L138 SettingsManager]: * sizeof long double=12 [2022-03-18 12:32:23,957 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-18 12:32:23,957 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-18 12:32:23,957 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-18 12:32:23,957 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-18 12:32:23,957 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-18 12:32:23,958 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-18 12:32:23,958 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 12:32:23,958 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-18 12:32:23,958 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-03-18 12:32:23,958 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-03-18 12:32:23,958 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-03-18 12:32:23,958 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-03-18 12:32:23,959 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2022-03-18 12:32:23,959 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-03-18 12:32:23,959 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-18 12:32:23,959 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-18 12:32:24,150 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-18 12:32:24,168 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-18 12:32:24,170 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-18 12:32:24,171 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-18 12:32:24,172 INFO L275 PluginConnector]: CDTParser initialized [2022-03-18 12:32:24,173 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/in-de20.c [2022-03-18 12:32:24,230 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ef92dec0/ce7a5c9f301d4c2785b443e5f631412f/FLAG835ed273e [2022-03-18 12:32:24,529 INFO L306 CDTParser]: Found 1 translation units. [2022-03-18 12:32:24,529 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de20.c [2022-03-18 12:32:24,534 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ef92dec0/ce7a5c9f301d4c2785b443e5f631412f/FLAG835ed273e [2022-03-18 12:32:24,966 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ef92dec0/ce7a5c9f301d4c2785b443e5f631412f [2022-03-18 12:32:24,968 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-18 12:32:24,969 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-18 12:32:24,971 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-18 12:32:24,971 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-18 12:32:24,974 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-18 12:32:24,974 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 12:32:24" (1/1) ... [2022-03-18 12:32:24,975 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3945fb70 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:32:24, skipping insertion in model container [2022-03-18 12:32:24,975 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 12:32:24" (1/1) ... [2022-03-18 12:32:24,981 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-18 12:32:24,992 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-18 12:32:25,107 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de20.c[368,381] [2022-03-18 12:32:25,120 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 12:32:25,132 INFO L203 MainTranslator]: Completed pre-run [2022-03-18 12:32:25,144 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de20.c[368,381] [2022-03-18 12:32:25,146 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 12:32:25,154 INFO L208 MainTranslator]: Completed translation [2022-03-18 12:32:25,154 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:32:25 WrapperNode [2022-03-18 12:32:25,154 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-18 12:32:25,155 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-18 12:32:25,155 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-18 12:32:25,155 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-18 12:32:25,162 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:32:25" (1/1) ... [2022-03-18 12:32:25,163 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:32:25" (1/1) ... [2022-03-18 12:32:25,169 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:32:25" (1/1) ... [2022-03-18 12:32:25,169 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:32:25" (1/1) ... [2022-03-18 12:32:25,177 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:32:25" (1/1) ... [2022-03-18 12:32:25,181 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:32:25" (1/1) ... [2022-03-18 12:32:25,182 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:32:25" (1/1) ... [2022-03-18 12:32:25,183 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-18 12:32:25,184 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-18 12:32:25,184 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-18 12:32:25,184 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-18 12:32:25,185 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:32:25" (1/1) ... [2022-03-18 12:32:25,191 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 12:32:25,198 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:32:25,208 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-18 12:32:25,211 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-18 12:32:25,234 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-18 12:32:25,235 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-18 12:32:25,235 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-18 12:32:25,235 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-18 12:32:25,235 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-18 12:32:25,235 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-18 12:32:25,235 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-18 12:32:25,235 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-18 12:32:25,235 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-18 12:32:25,236 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-03-18 12:32:25,236 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-18 12:32:25,236 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-18 12:32:25,236 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-18 12:32:25,236 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-18 12:32:25,236 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-18 12:32:25,236 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-18 12:32:25,236 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-18 12:32:25,236 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-18 12:32:25,283 INFO L234 CfgBuilder]: Building ICFG [2022-03-18 12:32:25,284 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-18 12:32:25,361 INFO L275 CfgBuilder]: Performing block encoding [2022-03-18 12:32:25,366 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-18 12:32:25,366 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-03-18 12:32:25,368 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 12:32:25 BoogieIcfgContainer [2022-03-18 12:32:25,368 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-18 12:32:25,370 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-18 12:32:25,370 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-18 12:32:25,373 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-18 12:32:25,373 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.03 12:32:24" (1/3) ... [2022-03-18 12:32:25,374 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@364aa5dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 12:32:25, skipping insertion in model container [2022-03-18 12:32:25,374 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:32:25" (2/3) ... [2022-03-18 12:32:25,374 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@364aa5dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 12:32:25, skipping insertion in model container [2022-03-18 12:32:25,374 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 12:32:25" (3/3) ... [2022-03-18 12:32:25,376 INFO L111 eAbstractionObserver]: Analyzing ICFG in-de20.c [2022-03-18 12:32:25,380 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-03-18 12:32:25,380 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-18 12:32:25,417 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-18 12:32:25,422 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 [2022-03-18 12:32:25,423 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-18 12:32:25,435 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 12:32:25,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-03-18 12:32:25,439 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:32:25,439 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:32:25,440 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:32:25,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:32:25,444 INFO L85 PathProgramCache]: Analyzing trace with hash 449096471, now seen corresponding path program 1 times [2022-03-18 12:32:25,451 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:32:25,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [832489434] [2022-03-18 12:32:25,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:32:25,453 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:32:25,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:25,760 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:32:25,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:25,769 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:25,770 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:32:25,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [832489434] [2022-03-18 12:32:25,771 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [832489434] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 12:32:25,771 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 12:32:25,771 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 12:32:25,772 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105048649] [2022-03-18 12:32:25,773 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 12:32:25,776 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 12:32:25,776 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:32:25,795 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 12:32:25,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-18 12:32:25,798 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 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 6 states, 6 states have (on average 1.5) 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) [2022-03-18 12:32:25,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:32:25,969 INFO L93 Difference]: Finished difference Result 46 states and 59 transitions. [2022-03-18 12:32:25,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-18 12:32:25,971 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) 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 [2022-03-18 12:32:25,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:32:25,978 INFO L225 Difference]: With dead ends: 46 [2022-03-18 12:32:25,979 INFO L226 Difference]: Without dead ends: 17 [2022-03-18 12:32:25,981 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-03-18 12:32:25,985 INFO L912 BasicCegarLoop]: 16 mSDtfsCounter, 29 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 12:32:25,986 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 37 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 12:32:26,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-03-18 12:32:26,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-03-18 12:32:26,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:26,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2022-03-18 12:32:26,022 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 13 [2022-03-18 12:32:26,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:32:26,022 INFO L478 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2022-03-18 12:32:26,023 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.5) 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) [2022-03-18 12:32:26,023 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2022-03-18 12:32:26,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-03-18 12:32:26,024 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:32:26,024 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:32:26,025 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-18 12:32:26,025 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:32:26,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:32:26,029 INFO L85 PathProgramCache]: Analyzing trace with hash 1071583787, now seen corresponding path program 1 times [2022-03-18 12:32:26,029 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:32:26,030 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [268445840] [2022-03-18 12:32:26,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:32:26,030 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:32:26,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:26,114 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:32:26,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:26,134 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:26,134 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:32:26,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [268445840] [2022-03-18 12:32:26,135 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [268445840] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 12:32:26,135 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 12:32:26,135 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 12:32:26,135 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558084897] [2022-03-18 12:32:26,135 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 12:32:26,137 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-18 12:32:26,137 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:32:26,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-18 12:32:26,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-18 12:32:26,138 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:26,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:32:26,195 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2022-03-18 12:32:26,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-18 12:32:26,196 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2022-03-18 12:32:26,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:32:26,197 INFO L225 Difference]: With dead ends: 23 [2022-03-18 12:32:26,197 INFO L226 Difference]: Without dead ends: 15 [2022-03-18 12:32:26,197 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-03-18 12:32:26,199 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 12 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 12:32:26,199 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 25 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 12:32:26,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-03-18 12:32:26,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-03-18 12:32:26,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:26,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2022-03-18 12:32:26,203 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 14 [2022-03-18 12:32:26,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:32:26,203 INFO L478 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2022-03-18 12:32:26,204 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:26,204 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2022-03-18 12:32:26,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-03-18 12:32:26,204 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:32:26,204 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:32:26,205 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-18 12:32:26,205 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:32:26,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:32:26,205 INFO L85 PathProgramCache]: Analyzing trace with hash -1025479988, now seen corresponding path program 1 times [2022-03-18 12:32:26,206 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:32:26,206 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1105921981] [2022-03-18 12:32:26,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:32:26,206 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:32:26,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:26,287 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:32:26,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:26,294 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:26,294 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:32:26,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1105921981] [2022-03-18 12:32:26,294 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1105921981] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:32:26,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [661009468] [2022-03-18 12:32:26,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:32:26,295 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:32:26,295 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:32:26,297 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:32:26,298 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-18 12:32:26,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:26,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-18 12:32:26,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:32:26,511 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:26,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:32:26,583 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:26,583 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [661009468] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 12:32:26,584 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 12:32:26,584 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 10 [2022-03-18 12:32:26,584 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355241075] [2022-03-18 12:32:26,584 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 12:32:26,589 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-18 12:32:26,589 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:32:26,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-18 12:32:26,591 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2022-03-18 12:32:26,591 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 states have internal predecessors, (18), 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) [2022-03-18 12:32:26,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:32:26,791 INFO L93 Difference]: Finished difference Result 35 states and 44 transitions. [2022-03-18 12:32:26,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-18 12:32:26,791 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 states have internal predecessors, (18), 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 14 [2022-03-18 12:32:26,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:32:26,793 INFO L225 Difference]: With dead ends: 35 [2022-03-18 12:32:26,793 INFO L226 Difference]: Without dead ends: 30 [2022-03-18 12:32:26,794 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=75, Invalid=197, Unknown=0, NotChecked=0, Total=272 [2022-03-18 12:32:26,795 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 41 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 12:32:26,795 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 29 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 12:32:26,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-03-18 12:32:26,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 20. [2022-03-18 12:32:26,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:26,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2022-03-18 12:32:26,801 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 14 [2022-03-18 12:32:26,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:32:26,801 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2022-03-18 12:32:26,801 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 states have internal predecessors, (18), 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) [2022-03-18 12:32:26,802 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2022-03-18 12:32:26,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-18 12:32:26,802 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:32:26,802 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:32:26,825 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-18 12:32:27,015 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 [2022-03-18 12:32:27,016 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:32:27,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:32:27,016 INFO L85 PathProgramCache]: Analyzing trace with hash -1690613482, now seen corresponding path program 1 times [2022-03-18 12:32:27,017 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:32:27,017 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1397040283] [2022-03-18 12:32:27,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:32:27,017 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:32:27,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:27,149 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:32:27,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:27,154 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:27,154 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:32:27,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1397040283] [2022-03-18 12:32:27,155 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1397040283] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:32:27,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [76040470] [2022-03-18 12:32:27,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:32:27,155 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:32:27,155 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:32:27,156 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:32:27,169 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-18 12:32:27,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:27,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-18 12:32:27,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:32:27,297 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:27,297 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:32:27,394 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:27,396 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [76040470] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 12:32:27,396 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 12:32:27,396 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 6] total 12 [2022-03-18 12:32:27,397 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946487401] [2022-03-18 12:32:27,397 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 12:32:27,398 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-18 12:32:27,400 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:32:27,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-18 12:32:27,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-03-18 12:32:27,402 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 9 states have internal predecessors, (22), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:27,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:32:27,533 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2022-03-18 12:32:27,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-18 12:32:27,534 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 9 states have internal predecessors, (22), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-03-18 12:32:27,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:32:27,536 INFO L225 Difference]: With dead ends: 28 [2022-03-18 12:32:27,536 INFO L226 Difference]: Without dead ends: 23 [2022-03-18 12:32:27,539 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 24 SyntacticMatches, 4 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2022-03-18 12:32:27,540 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 15 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 12:32:27,540 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 48 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 12:32:27,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-18 12:32:27,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2022-03-18 12:32:27,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:27,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2022-03-18 12:32:27,546 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 15 [2022-03-18 12:32:27,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:32:27,546 INFO L478 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2022-03-18 12:32:27,546 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 9 states have internal predecessors, (22), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:27,546 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2022-03-18 12:32:27,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-03-18 12:32:27,547 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:32:27,551 INFO L500 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:32:27,577 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-18 12:32:27,759 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 [2022-03-18 12:32:27,760 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:32:27,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:32:27,760 INFO L85 PathProgramCache]: Analyzing trace with hash -834915316, now seen corresponding path program 2 times [2022-03-18 12:32:27,760 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:32:27,760 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1798472190] [2022-03-18 12:32:27,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:32:27,761 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:32:27,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:27,826 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:32:27,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:27,848 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:27,848 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:32:27,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1798472190] [2022-03-18 12:32:27,848 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1798472190] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:32:27,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1095242135] [2022-03-18 12:32:27,849 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 12:32:27,849 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:32:27,849 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:32:27,850 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:32:27,851 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-18 12:32:27,884 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 12:32:27,885 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 12:32:27,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-18 12:32:27,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:32:27,960 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:27,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:32:28,059 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:28,060 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1095242135] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 12:32:28,060 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 12:32:28,060 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2022-03-18 12:32:28,060 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139816587] [2022-03-18 12:32:28,060 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 12:32:28,061 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-18 12:32:28,061 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:32:28,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-18 12:32:28,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2022-03-18 12:32:28,062 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 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) [2022-03-18 12:32:28,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:32:28,372 INFO L93 Difference]: Finished difference Result 38 states and 47 transitions. [2022-03-18 12:32:28,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-18 12:32:28,373 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 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 16 [2022-03-18 12:32:28,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:32:28,374 INFO L225 Difference]: With dead ends: 38 [2022-03-18 12:32:28,374 INFO L226 Difference]: Without dead ends: 29 [2022-03-18 12:32:28,374 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=135, Invalid=567, Unknown=0, NotChecked=0, Total=702 [2022-03-18 12:32:28,375 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 29 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 12:32:28,375 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 41 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 12:32:28,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-18 12:32:28,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 24. [2022-03-18 12:32:28,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:28,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2022-03-18 12:32:28,382 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 16 [2022-03-18 12:32:28,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:32:28,382 INFO L478 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2022-03-18 12:32:28,383 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 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) [2022-03-18 12:32:28,383 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2022-03-18 12:32:28,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-18 12:32:28,383 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:32:28,383 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:32:28,409 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-18 12:32:28,599 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 [2022-03-18 12:32:28,600 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:32:28,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:32:28,600 INFO L85 PathProgramCache]: Analyzing trace with hash -1016701897, now seen corresponding path program 3 times [2022-03-18 12:32:28,600 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:32:28,600 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [969481249] [2022-03-18 12:32:28,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:32:28,601 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:32:28,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:28,754 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:32:28,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:28,761 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:28,761 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:32:28,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [969481249] [2022-03-18 12:32:28,761 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [969481249] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:32:28,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [65925836] [2022-03-18 12:32:28,761 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-03-18 12:32:28,761 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:32:28,762 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:32:28,763 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:32:28,764 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-18 12:32:28,792 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-03-18 12:32:28,792 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 12:32:28,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 13 conjunts are in the unsatisfiable core [2022-03-18 12:32:28,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:32:28,858 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:28,858 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:32:28,950 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:28,951 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [65925836] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 12:32:28,951 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 12:32:28,951 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 14 [2022-03-18 12:32:28,951 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097592391] [2022-03-18 12:32:28,951 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 12:32:28,951 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-18 12:32:28,951 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:32:28,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-18 12:32:28,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2022-03-18 12:32:28,952 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 11 states have internal predecessors, (26), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:29,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:32:29,088 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2022-03-18 12:32:29,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-18 12:32:29,089 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 11 states have internal predecessors, (26), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-03-18 12:32:29,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:32:29,089 INFO L225 Difference]: With dead ends: 31 [2022-03-18 12:32:29,089 INFO L226 Difference]: Without dead ends: 26 [2022-03-18 12:32:29,090 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 28 SyntacticMatches, 4 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2022-03-18 12:32:29,090 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 15 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 12:32:29,091 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 48 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 12:32:29,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-03-18 12:32:29,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2022-03-18 12:32:29,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.25) internal successors, (25), 20 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:29,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2022-03-18 12:32:29,099 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 17 [2022-03-18 12:32:29,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:32:29,099 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2022-03-18 12:32:29,099 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 11 states have internal predecessors, (26), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:29,100 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2022-03-18 12:32:29,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-18 12:32:29,100 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:32:29,100 INFO L500 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:32:29,125 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-18 12:32:29,317 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 [2022-03-18 12:32:29,317 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:32:29,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:32:29,318 INFO L85 PathProgramCache]: Analyzing trace with hash -1601169482, now seen corresponding path program 4 times [2022-03-18 12:32:29,318 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:32:29,318 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [442302357] [2022-03-18 12:32:29,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:32:29,318 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:32:29,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:29,411 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:32:29,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:29,416 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:29,416 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:32:29,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [442302357] [2022-03-18 12:32:29,416 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [442302357] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:32:29,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [584207015] [2022-03-18 12:32:29,416 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 12:32:29,417 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:32:29,417 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:32:29,418 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:32:29,440 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-18 12:32:29,453 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 12:32:29,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 12:32:29,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 13 conjunts are in the unsatisfiable core [2022-03-18 12:32:29,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:32:29,512 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:29,512 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:32:29,612 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:29,613 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [584207015] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 12:32:29,613 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 12:32:29,613 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 16 [2022-03-18 12:32:29,613 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1938547934] [2022-03-18 12:32:29,613 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 12:32:29,614 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-18 12:32:29,614 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:32:29,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-18 12:32:29,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2022-03-18 12:32:29,615 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 16 states, 16 states have (on average 1.5) internal successors, (24), 15 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) [2022-03-18 12:32:30,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:32:30,434 INFO L93 Difference]: Finished difference Result 59 states and 80 transitions. [2022-03-18 12:32:30,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-03-18 12:32:30,435 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 15 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 17 [2022-03-18 12:32:30,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:32:30,435 INFO L225 Difference]: With dead ends: 59 [2022-03-18 12:32:30,435 INFO L226 Difference]: Without dead ends: 54 [2022-03-18 12:32:30,436 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 397 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=434, Invalid=1372, Unknown=0, NotChecked=0, Total=1806 [2022-03-18 12:32:30,437 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 93 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 12:32:30,437 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 52 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 12:32:30,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-03-18 12:32:30,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 29. [2022-03-18 12:32:30,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.375) internal successors, (33), 24 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:30,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 37 transitions. [2022-03-18 12:32:30,453 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 37 transitions. Word has length 17 [2022-03-18 12:32:30,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:32:30,454 INFO L478 AbstractCegarLoop]: Abstraction has 29 states and 37 transitions. [2022-03-18 12:32:30,454 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 15 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) [2022-03-18 12:32:30,454 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 37 transitions. [2022-03-18 12:32:30,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-18 12:32:30,455 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:32:30,455 INFO L500 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:32:30,480 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-18 12:32:30,671 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 [2022-03-18 12:32:30,672 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:32:30,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:32:30,672 INFO L85 PathProgramCache]: Analyzing trace with hash -1418492661, now seen corresponding path program 5 times [2022-03-18 12:32:30,672 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:32:30,672 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1474717323] [2022-03-18 12:32:30,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:32:30,672 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:32:30,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:30,763 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:32:30,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:30,769 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:30,770 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:32:30,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1474717323] [2022-03-18 12:32:30,770 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1474717323] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:32:30,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [851189074] [2022-03-18 12:32:30,770 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-03-18 12:32:30,770 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:32:30,770 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:32:30,771 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:32:30,772 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-18 12:32:30,809 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2022-03-18 12:32:30,809 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 12:32:30,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 15 conjunts are in the unsatisfiable core [2022-03-18 12:32:30,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:32:30,885 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:30,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:32:30,996 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:30,997 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [851189074] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 12:32:30,997 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 12:32:30,997 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2022-03-18 12:32:30,997 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836129692] [2022-03-18 12:32:30,997 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 12:32:30,998 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-18 12:32:30,998 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:32:30,998 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-18 12:32:30,998 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2022-03-18 12:32:30,998 INFO L87 Difference]: Start difference. First operand 29 states and 37 transitions. Second operand has 17 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 16 states have internal predecessors, (26), 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) [2022-03-18 12:32:31,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:32:31,789 INFO L93 Difference]: Finished difference Result 57 states and 72 transitions. [2022-03-18 12:32:31,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-03-18 12:32:31,790 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 16 states have internal predecessors, (26), 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 [2022-03-18 12:32:31,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:32:31,790 INFO L225 Difference]: With dead ends: 57 [2022-03-18 12:32:31,791 INFO L226 Difference]: Without dead ends: 47 [2022-03-18 12:32:31,791 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 272 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=275, Invalid=1365, Unknown=0, NotChecked=0, Total=1640 [2022-03-18 12:32:31,792 INFO L912 BasicCegarLoop]: 17 mSDtfsCounter, 44 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 258 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 258 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 12:32:31,792 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 74 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 258 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 12:32:31,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-03-18 12:32:31,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 34. [2022-03-18 12:32:31,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 29 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:31,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2022-03-18 12:32:31,807 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 18 [2022-03-18 12:32:31,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:32:31,807 INFO L478 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2022-03-18 12:32:31,808 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 16 states have internal predecessors, (26), 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) [2022-03-18 12:32:31,808 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2022-03-18 12:32:31,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-18 12:32:31,808 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:32:31,808 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:32:31,834 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-18 12:32:32,025 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:32:32,025 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:32:32,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:32:32,026 INFO L85 PathProgramCache]: Analyzing trace with hash -21737866, now seen corresponding path program 6 times [2022-03-18 12:32:32,026 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:32:32,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [805794332] [2022-03-18 12:32:32,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:32:32,026 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:32:32,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:32,147 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:32:32,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:32,153 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:32,153 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:32:32,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [805794332] [2022-03-18 12:32:32,153 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [805794332] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:32:32,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [204450468] [2022-03-18 12:32:32,154 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 12:32:32,154 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:32:32,154 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:32:32,155 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:32:32,180 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-18 12:32:32,193 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-18 12:32:32,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 12:32:32,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 17 conjunts are in the unsatisfiable core [2022-03-18 12:32:32,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:32:32,269 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:32,270 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:32:32,388 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:32,388 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [204450468] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 12:32:32,388 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 12:32:32,388 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 16 [2022-03-18 12:32:32,388 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928363466] [2022-03-18 12:32:32,388 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 12:32:32,389 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-18 12:32:32,389 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:32:32,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-18 12:32:32,389 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2022-03-18 12:32:32,390 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand has 16 states, 16 states have (on average 1.875) internal successors, (30), 13 states have internal predecessors, (30), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:32,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:32:32,548 INFO L93 Difference]: Finished difference Result 43 states and 50 transitions. [2022-03-18 12:32:32,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-18 12:32:32,548 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.875) internal successors, (30), 13 states have internal predecessors, (30), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2022-03-18 12:32:32,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:32:32,549 INFO L225 Difference]: With dead ends: 43 [2022-03-18 12:32:32,549 INFO L226 Difference]: Without dead ends: 38 [2022-03-18 12:32:32,550 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 32 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=71, Invalid=391, Unknown=0, NotChecked=0, Total=462 [2022-03-18 12:32:32,550 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 14 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 12:32:32,550 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 53 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 131 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 12:32:32,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-03-18 12:32:32,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 33. [2022-03-18 12:32:32,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 28 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:32,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 40 transitions. [2022-03-18 12:32:32,566 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 40 transitions. Word has length 19 [2022-03-18 12:32:32,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:32:32,567 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 40 transitions. [2022-03-18 12:32:32,569 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.875) internal successors, (30), 13 states have internal predecessors, (30), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:32,569 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 40 transitions. [2022-03-18 12:32:32,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-18 12:32:32,569 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:32:32,570 INFO L500 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:32:32,595 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-18 12:32:32,783 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:32:32,783 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:32:32,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:32:32,784 INFO L85 PathProgramCache]: Analyzing trace with hash -639378772, now seen corresponding path program 7 times [2022-03-18 12:32:32,784 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:32:32,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1524554112] [2022-03-18 12:32:32,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:32:32,784 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:32:32,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:32,890 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:32:32,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:32,895 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:32,895 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:32:32,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1524554112] [2022-03-18 12:32:32,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1524554112] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:32:32,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1812739697] [2022-03-18 12:32:32,895 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-03-18 12:32:32,895 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:32:32,895 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:32:32,900 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:32:32,926 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-18 12:32:32,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:32,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 17 conjunts are in the unsatisfiable core [2022-03-18 12:32:32,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:32:33,006 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:33,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:32:33,149 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:33,149 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1812739697] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 12:32:33,150 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 12:32:33,150 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 19 [2022-03-18 12:32:33,150 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [267638939] [2022-03-18 12:32:33,150 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 12:32:33,150 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-18 12:32:33,150 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:32:33,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-18 12:32:33,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=299, Unknown=0, NotChecked=0, Total=342 [2022-03-18 12:32:33,151 INFO L87 Difference]: Start difference. First operand 33 states and 40 transitions. Second operand has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 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) [2022-03-18 12:32:33,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:32:33,375 INFO L93 Difference]: Finished difference Result 44 states and 51 transitions. [2022-03-18 12:32:33,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-18 12:32:33,375 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 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 20 [2022-03-18 12:32:33,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:32:33,376 INFO L225 Difference]: With dead ends: 44 [2022-03-18 12:32:33,376 INFO L226 Difference]: Without dead ends: 33 [2022-03-18 12:32:33,377 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=100, Invalid=656, Unknown=0, NotChecked=0, Total=756 [2022-03-18 12:32:33,377 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 13 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 176 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 191 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 12:32:33,377 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 74 Invalid, 191 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 176 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 12:32:33,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-03-18 12:32:33,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-03-18 12:32:33,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.25) internal successors, (35), 28 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:33,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2022-03-18 12:32:33,392 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 20 [2022-03-18 12:32:33,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:32:33,392 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2022-03-18 12:32:33,392 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 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) [2022-03-18 12:32:33,393 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2022-03-18 12:32:33,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-18 12:32:33,397 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:32:33,398 INFO L500 BasicCegarLoop]: trace histogram [5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:32:33,425 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-18 12:32:33,619 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-03-18 12:32:33,620 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:32:33,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:32:33,620 INFO L85 PathProgramCache]: Analyzing trace with hash -610638132, now seen corresponding path program 8 times [2022-03-18 12:32:33,620 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:32:33,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [919982415] [2022-03-18 12:32:33,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:32:33,620 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:32:33,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:33,734 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:32:33,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:33,738 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:33,738 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:32:33,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [919982415] [2022-03-18 12:32:33,738 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [919982415] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:32:33,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2025378935] [2022-03-18 12:32:33,738 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 12:32:33,739 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:32:33,739 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:32:33,740 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:32:33,744 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-18 12:32:33,777 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 12:32:33,777 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 12:32:33,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 19 conjunts are in the unsatisfiable core [2022-03-18 12:32:33,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:32:33,864 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:33,864 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:32:34,044 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:34,045 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2025378935] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 12:32:34,045 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 12:32:34,045 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 22 [2022-03-18 12:32:34,045 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945708456] [2022-03-18 12:32:34,045 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 12:32:34,046 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-18 12:32:34,046 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:32:34,046 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-18 12:32:34,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=373, Unknown=0, NotChecked=0, Total=462 [2022-03-18 12:32:34,046 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand has 22 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 21 states have internal predecessors, (30), 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) [2022-03-18 12:32:37,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:32:37,112 INFO L93 Difference]: Finished difference Result 82 states and 115 transitions. [2022-03-18 12:32:37,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-03-18 12:32:37,112 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 21 states have internal predecessors, (30), 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 20 [2022-03-18 12:32:37,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:32:37,113 INFO L225 Difference]: With dead ends: 82 [2022-03-18 12:32:37,113 INFO L226 Difference]: Without dead ends: 77 [2022-03-18 12:32:37,114 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1229 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1065, Invalid=3627, Unknown=0, NotChecked=0, Total=4692 [2022-03-18 12:32:37,115 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 157 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 300 mSolverCounterSat, 176 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 157 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 476 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 176 IncrementalHoareTripleChecker+Valid, 300 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-18 12:32:37,115 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [157 Valid, 82 Invalid, 476 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [176 Valid, 300 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-18 12:32:37,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-03-18 12:32:37,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 39. [2022-03-18 12:32:37,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.3823529411764706) internal successors, (47), 34 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:37,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 51 transitions. [2022-03-18 12:32:37,126 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 51 transitions. Word has length 20 [2022-03-18 12:32:37,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:32:37,127 INFO L478 AbstractCegarLoop]: Abstraction has 39 states and 51 transitions. [2022-03-18 12:32:37,127 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 21 states have internal predecessors, (30), 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) [2022-03-18 12:32:37,127 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 51 transitions. [2022-03-18 12:32:37,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-18 12:32:37,127 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:32:37,128 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:32:37,147 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-18 12:32:37,335 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:32:37,335 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:32:37,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:32:37,336 INFO L85 PathProgramCache]: Analyzing trace with hash 1612182871, now seen corresponding path program 9 times [2022-03-18 12:32:37,336 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:32:37,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1372702387] [2022-03-18 12:32:37,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:32:37,336 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:32:37,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:37,500 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:32:37,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:37,507 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:37,507 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:32:37,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1372702387] [2022-03-18 12:32:37,507 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1372702387] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:32:37,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1459270356] [2022-03-18 12:32:37,507 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-03-18 12:32:37,507 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:32:37,507 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:32:37,508 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:32:37,509 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-18 12:32:37,548 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-03-18 12:32:37,549 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 12:32:37,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 21 conjunts are in the unsatisfiable core [2022-03-18 12:32:37,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:32:37,624 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:37,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:32:37,747 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:37,747 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1459270356] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 12:32:37,747 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 12:32:37,747 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9] total 18 [2022-03-18 12:32:37,747 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48798858] [2022-03-18 12:32:37,747 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 12:32:37,748 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-18 12:32:37,748 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:32:37,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-18 12:32:37,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=264, Unknown=0, NotChecked=0, Total=306 [2022-03-18 12:32:37,748 INFO L87 Difference]: Start difference. First operand 39 states and 51 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 15 states have internal predecessors, (34), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:37,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:32:37,954 INFO L93 Difference]: Finished difference Result 49 states and 61 transitions. [2022-03-18 12:32:37,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-18 12:32:37,955 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 15 states have internal predecessors, (34), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2022-03-18 12:32:37,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:32:37,955 INFO L225 Difference]: With dead ends: 49 [2022-03-18 12:32:37,955 INFO L226 Difference]: Without dead ends: 44 [2022-03-18 12:32:37,956 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 36 SyntacticMatches, 4 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=81, Invalid=519, Unknown=0, NotChecked=0, Total=600 [2022-03-18 12:32:37,956 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 14 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 198 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 12:32:37,956 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 68 Invalid, 209 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 198 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 12:32:37,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-03-18 12:32:37,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 38. [2022-03-18 12:32:37,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.393939393939394) internal successors, (46), 33 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:37,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 50 transitions. [2022-03-18 12:32:37,977 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 50 transitions. Word has length 21 [2022-03-18 12:32:37,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:32:37,977 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 50 transitions. [2022-03-18 12:32:37,978 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 15 states have internal predecessors, (34), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:37,978 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 50 transitions. [2022-03-18 12:32:37,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-18 12:32:37,978 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:32:37,978 INFO L500 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:32:38,004 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-18 12:32:38,195 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-03-18 12:32:38,195 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:32:38,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:32:38,196 INFO L85 PathProgramCache]: Analyzing trace with hash -1527443477, now seen corresponding path program 10 times [2022-03-18 12:32:38,196 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:32:38,196 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [78704741] [2022-03-18 12:32:38,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:32:38,196 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:32:38,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:38,322 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:32:38,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:38,338 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:38,338 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:32:38,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [78704741] [2022-03-18 12:32:38,338 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [78704741] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:32:38,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1336197314] [2022-03-18 12:32:38,338 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 12:32:38,339 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:32:38,339 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:32:38,344 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:32:38,345 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-18 12:32:38,384 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 12:32:38,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 12:32:38,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 21 conjunts are in the unsatisfiable core [2022-03-18 12:32:38,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:32:38,451 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:38,451 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:32:38,614 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:38,615 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1336197314] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 12:32:38,615 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 12:32:38,615 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 23 [2022-03-18 12:32:38,615 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [301143191] [2022-03-18 12:32:38,615 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 12:32:38,615 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-18 12:32:38,615 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:32:38,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-18 12:32:38,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=453, Unknown=0, NotChecked=0, Total=506 [2022-03-18 12:32:38,616 INFO L87 Difference]: Start difference. First operand 38 states and 50 transitions. Second operand has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 22 states have internal predecessors, (31), 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) [2022-03-18 12:32:38,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:32:38,907 INFO L93 Difference]: Finished difference Result 50 states and 62 transitions. [2022-03-18 12:32:38,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-18 12:32:38,908 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 22 states have internal predecessors, (31), 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 22 [2022-03-18 12:32:38,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:32:38,908 INFO L225 Difference]: With dead ends: 50 [2022-03-18 12:32:38,908 INFO L226 Difference]: Without dead ends: 38 [2022-03-18 12:32:38,909 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=123, Invalid=999, Unknown=0, NotChecked=0, Total=1122 [2022-03-18 12:32:38,909 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 12 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 261 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 12:32:38,910 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 94 Invalid, 275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 261 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 12:32:38,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-03-18 12:32:38,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-03-18 12:32:38,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.3636363636363635) internal successors, (45), 33 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:38,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 49 transitions. [2022-03-18 12:32:38,920 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 49 transitions. Word has length 22 [2022-03-18 12:32:38,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:32:38,920 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 49 transitions. [2022-03-18 12:32:38,920 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 22 states have internal predecessors, (31), 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) [2022-03-18 12:32:38,921 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 49 transitions. [2022-03-18 12:32:38,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-18 12:32:38,921 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:32:38,921 INFO L500 BasicCegarLoop]: trace histogram [6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:32:38,948 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-03-18 12:32:39,121 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-03-18 12:32:39,122 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:32:39,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:32:39,122 INFO L85 PathProgramCache]: Analyzing trace with hash -636483637, now seen corresponding path program 11 times [2022-03-18 12:32:39,122 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:32:39,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [892191610] [2022-03-18 12:32:39,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:32:39,123 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:32:39,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:39,276 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:32:39,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:39,280 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:39,280 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:32:39,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [892191610] [2022-03-18 12:32:39,280 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [892191610] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:32:39,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [712956913] [2022-03-18 12:32:39,280 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-03-18 12:32:39,280 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:32:39,281 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:32:39,282 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:32:39,283 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-18 12:32:39,333 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2022-03-18 12:32:39,333 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 12:32:39,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 23 conjunts are in the unsatisfiable core [2022-03-18 12:32:39,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:32:39,419 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:39,419 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:32:39,616 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:39,616 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [712956913] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 12:32:39,616 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 12:32:39,616 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 26 [2022-03-18 12:32:39,617 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048178234] [2022-03-18 12:32:39,617 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 12:32:39,617 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-18 12:32:39,617 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:32:39,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-18 12:32:39,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=534, Unknown=0, NotChecked=0, Total=650 [2022-03-18 12:32:39,618 INFO L87 Difference]: Start difference. First operand 38 states and 49 transitions. Second operand has 26 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 25 states have internal predecessors, (34), 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) [2022-03-18 12:32:47,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:32:47,987 INFO L93 Difference]: Finished difference Result 103 states and 144 transitions. [2022-03-18 12:32:47,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-03-18 12:32:47,987 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 25 states have internal predecessors, (34), 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 22 [2022-03-18 12:32:47,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:32:47,988 INFO L225 Difference]: With dead ends: 103 [2022-03-18 12:32:47,988 INFO L226 Difference]: Without dead ends: 98 [2022-03-18 12:32:47,990 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2398 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=1783, Invalid=6589, Unknown=0, NotChecked=0, Total=8372 [2022-03-18 12:32:47,990 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 201 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 344 mSolverCounterSat, 284 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 201 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 628 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 284 IncrementalHoareTripleChecker+Valid, 344 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-18 12:32:47,991 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [201 Valid, 80 Invalid, 628 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [284 Valid, 344 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-18 12:32:47,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-03-18 12:32:48,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 50. [2022-03-18 12:32:48,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.3777777777777778) internal successors, (62), 45 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:48,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 66 transitions. [2022-03-18 12:32:48,008 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 66 transitions. Word has length 22 [2022-03-18 12:32:48,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:32:48,008 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 66 transitions. [2022-03-18 12:32:48,009 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 25 states have internal predecessors, (34), 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) [2022-03-18 12:32:48,009 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 66 transitions. [2022-03-18 12:32:48,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-18 12:32:48,009 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:32:48,009 INFO L500 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:32:48,026 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-03-18 12:32:48,211 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-03-18 12:32:48,211 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:32:48,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:32:48,211 INFO L85 PathProgramCache]: Analyzing trace with hash 1854745558, now seen corresponding path program 12 times [2022-03-18 12:32:48,211 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:32:48,211 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1500931759] [2022-03-18 12:32:48,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:32:48,212 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:32:48,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:48,394 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:32:48,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:48,397 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:48,397 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:32:48,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1500931759] [2022-03-18 12:32:48,398 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1500931759] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:32:48,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [849013715] [2022-03-18 12:32:48,398 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 12:32:48,398 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:32:48,398 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:32:48,400 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:32:48,411 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-18 12:32:48,462 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-18 12:32:48,463 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 12:32:48,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 27 conjunts are in the unsatisfiable core [2022-03-18 12:32:48,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:32:48,563 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:48,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:32:48,724 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:48,725 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [849013715] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 12:32:48,725 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 12:32:48,725 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10, 10] total 20 [2022-03-18 12:32:48,725 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092503704] [2022-03-18 12:32:48,725 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 12:32:48,725 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-18 12:32:48,725 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:32:48,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-18 12:32:48,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=333, Unknown=0, NotChecked=0, Total=380 [2022-03-18 12:32:48,727 INFO L87 Difference]: Start difference. First operand 50 states and 66 transitions. Second operand has 20 states, 20 states have (on average 1.9) internal successors, (38), 17 states have internal predecessors, (38), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:48,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:32:48,984 INFO L93 Difference]: Finished difference Result 61 states and 77 transitions. [2022-03-18 12:32:48,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-18 12:32:48,984 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.9) internal successors, (38), 17 states have internal predecessors, (38), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-03-18 12:32:48,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:32:48,985 INFO L225 Difference]: With dead ends: 61 [2022-03-18 12:32:48,985 INFO L226 Difference]: Without dead ends: 56 [2022-03-18 12:32:48,985 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 40 SyntacticMatches, 4 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=665, Unknown=0, NotChecked=0, Total=756 [2022-03-18 12:32:48,987 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 14 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 12:32:48,987 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 83 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 12:32:48,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-03-18 12:32:49,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 53. [2022-03-18 12:32:49,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.3541666666666667) internal successors, (65), 48 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:49,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 69 transitions. [2022-03-18 12:32:49,004 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 69 transitions. Word has length 23 [2022-03-18 12:32:49,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:32:49,004 INFO L478 AbstractCegarLoop]: Abstraction has 53 states and 69 transitions. [2022-03-18 12:32:49,005 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.9) internal successors, (38), 17 states have internal predecessors, (38), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:32:49,005 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 69 transitions. [2022-03-18 12:32:49,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-18 12:32:49,005 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:32:49,005 INFO L500 BasicCegarLoop]: trace histogram [7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:32:49,023 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-18 12:32:49,210 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-03-18 12:32:49,211 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:32:49,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:32:49,211 INFO L85 PathProgramCache]: Analyzing trace with hash -747983508, now seen corresponding path program 13 times [2022-03-18 12:32:49,211 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:32:49,211 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472085113] [2022-03-18 12:32:49,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:32:49,211 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:32:49,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:49,365 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:32:49,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:49,369 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:49,369 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:32:49,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472085113] [2022-03-18 12:32:49,369 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [472085113] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:32:49,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1986389330] [2022-03-18 12:32:49,369 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-03-18 12:32:49,369 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:32:49,369 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:32:49,370 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:32:49,371 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-18 12:32:49,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:32:49,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 27 conjunts are in the unsatisfiable core [2022-03-18 12:32:49,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:32:49,503 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:49,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:32:49,801 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:32:49,801 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1986389330] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 12:32:49,801 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 12:32:49,801 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 30 [2022-03-18 12:32:49,801 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578682857] [2022-03-18 12:32:49,801 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 12:32:49,802 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-03-18 12:32:49,802 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:32:49,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-03-18 12:32:49,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=723, Unknown=0, NotChecked=0, Total=870 [2022-03-18 12:32:49,802 INFO L87 Difference]: Start difference. First operand 53 states and 69 transitions. Second operand has 30 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 29 states have internal predecessors, (38), 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) [2022-03-18 12:33:15,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:33:15,286 INFO L93 Difference]: Finished difference Result 135 states and 188 transitions. [2022-03-18 12:33:15,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2022-03-18 12:33:15,286 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 29 states have internal predecessors, (38), 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 [2022-03-18 12:33:15,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:33:15,287 INFO L225 Difference]: With dead ends: 135 [2022-03-18 12:33:15,287 INFO L226 Difference]: Without dead ends: 130 [2022-03-18 12:33:15,290 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4829 ImplicationChecksByTransitivity, 25.0s TimeCoverageRelationStatistics Valid=3140, Invalid=12112, Unknown=0, NotChecked=0, Total=15252 [2022-03-18 12:33:15,290 INFO L912 BasicCegarLoop]: 16 mSDtfsCounter, 278 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 510 mSolverCounterSat, 457 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 278 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 967 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 457 IncrementalHoareTripleChecker+Valid, 510 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-18 12:33:15,291 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [278 Valid, 88 Invalid, 967 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [457 Valid, 510 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-18 12:33:15,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2022-03-18 12:33:15,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 63. [2022-03-18 12:33:15,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.396551724137931) internal successors, (81), 58 states have internal predecessors, (81), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:33:15,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 85 transitions. [2022-03-18 12:33:15,329 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 85 transitions. Word has length 24 [2022-03-18 12:33:15,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:33:15,330 INFO L478 AbstractCegarLoop]: Abstraction has 63 states and 85 transitions. [2022-03-18 12:33:15,330 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 29 states have internal predecessors, (38), 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) [2022-03-18 12:33:15,330 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 85 transitions. [2022-03-18 12:33:15,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-18 12:33:15,330 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:33:15,330 INFO L500 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:33:15,346 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-03-18 12:33:15,530 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:33:15,531 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:33:15,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:33:15,531 INFO L85 PathProgramCache]: Analyzing trace with hash 690452087, now seen corresponding path program 14 times [2022-03-18 12:33:15,531 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:33:15,531 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1431860988] [2022-03-18 12:33:15,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:33:15,531 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:33:15,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:33:16,032 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:33:16,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:33:16,036 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:33:16,036 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:33:16,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1431860988] [2022-03-18 12:33:16,036 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1431860988] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:33:16,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [435408889] [2022-03-18 12:33:16,037 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 12:33:16,037 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:33:16,037 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:33:16,040 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:33:16,044 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-18 12:33:16,082 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 12:33:16,082 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 12:33:16,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-18 12:33:16,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:33:16,345 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:33:16,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:33:16,639 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:33:16,640 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [435408889] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 12:33:16,640 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 12:33:16,640 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 11, 11] total 34 [2022-03-18 12:33:16,640 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522768907] [2022-03-18 12:33:16,640 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 12:33:16,640 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-03-18 12:33:16,640 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:33:16,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-03-18 12:33:16,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1016, Unknown=0, NotChecked=0, Total=1122 [2022-03-18 12:33:16,641 INFO L87 Difference]: Start difference. First operand 63 states and 85 transitions. Second operand has 34 states, 34 states have (on average 1.6176470588235294) internal successors, (55), 31 states have internal predecessors, (55), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:33:17,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:33:17,865 INFO L93 Difference]: Finished difference Result 78 states and 100 transitions. [2022-03-18 12:33:17,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-18 12:33:17,866 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.6176470588235294) internal successors, (55), 31 states have internal predecessors, (55), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2022-03-18 12:33:17,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:33:17,867 INFO L225 Difference]: With dead ends: 78 [2022-03-18 12:33:17,867 INFO L226 Difference]: Without dead ends: 73 [2022-03-18 12:33:17,867 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 30 SyntacticMatches, 7 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=209, Invalid=2143, Unknown=0, NotChecked=0, Total=2352 [2022-03-18 12:33:17,868 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 20 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 590 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 611 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 590 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-03-18 12:33:17,868 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 119 Invalid, 611 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 590 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-03-18 12:33:17,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-03-18 12:33:17,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 64. [2022-03-18 12:33:17,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 59 states have (on average 1.3898305084745763) internal successors, (82), 59 states have internal predecessors, (82), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:33:17,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 86 transitions. [2022-03-18 12:33:17,903 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 86 transitions. Word has length 25 [2022-03-18 12:33:17,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:33:17,903 INFO L478 AbstractCegarLoop]: Abstraction has 64 states and 86 transitions. [2022-03-18 12:33:17,904 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.6176470588235294) internal successors, (55), 31 states have internal predecessors, (55), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:33:17,904 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 86 transitions. [2022-03-18 12:33:17,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-18 12:33:17,904 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:33:17,904 INFO L500 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:33:17,927 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-18 12:33:18,123 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-03-18 12:33:18,123 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:33:18,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:33:18,124 INFO L85 PathProgramCache]: Analyzing trace with hash -112387369, now seen corresponding path program 2 times [2022-03-18 12:33:18,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:33:18,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [674308858] [2022-03-18 12:33:18,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:33:18,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:33:18,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:33:18,306 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:33:18,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:33:18,317 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:33:18,317 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:33:18,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [674308858] [2022-03-18 12:33:18,317 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [674308858] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:33:18,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1764025782] [2022-03-18 12:33:18,318 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 12:33:18,318 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:33:18,318 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:33:18,320 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:33:18,329 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-18 12:33:18,363 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 12:33:18,363 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 12:33:18,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-18 12:33:18,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:33:18,443 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:33:18,443 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:33:18,799 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:33:18,800 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1764025782] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 12:33:18,800 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 12:33:18,800 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 32 [2022-03-18 12:33:18,800 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472559695] [2022-03-18 12:33:18,800 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 12:33:18,800 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-03-18 12:33:18,800 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:33:18,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-03-18 12:33:18,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=760, Unknown=0, NotChecked=0, Total=992 [2022-03-18 12:33:18,801 INFO L87 Difference]: Start difference. First operand 64 states and 86 transitions. Second operand has 32 states, 32 states have (on average 1.25) internal successors, (40), 31 states have internal predecessors, (40), 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) [2022-03-18 12:33:47,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:33:47,757 INFO L93 Difference]: Finished difference Result 185 states and 248 transitions. [2022-03-18 12:33:47,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-03-18 12:33:47,758 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.25) internal successors, (40), 31 states have internal predecessors, (40), 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 25 [2022-03-18 12:33:47,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:33:47,759 INFO L225 Difference]: With dead ends: 185 [2022-03-18 12:33:47,759 INFO L226 Difference]: Without dead ends: 180 [2022-03-18 12:33:47,760 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1361 ImplicationChecksByTransitivity, 28.2s TimeCoverageRelationStatistics Valid=1536, Invalid=4784, Unknown=0, NotChecked=0, Total=6320 [2022-03-18 12:33:47,761 INFO L912 BasicCegarLoop]: 33 mSDtfsCounter, 651 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 892 mSolverCounterSat, 248 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 651 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 1140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 248 IncrementalHoareTripleChecker+Valid, 892 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-03-18 12:33:47,761 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [651 Valid, 110 Invalid, 1140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [248 Valid, 892 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-03-18 12:33:47,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2022-03-18 12:33:47,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 73. [2022-03-18 12:33:47,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.4264705882352942) internal successors, (97), 68 states have internal predecessors, (97), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:33:47,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 101 transitions. [2022-03-18 12:33:47,793 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 101 transitions. Word has length 25 [2022-03-18 12:33:47,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:33:47,793 INFO L478 AbstractCegarLoop]: Abstraction has 73 states and 101 transitions. [2022-03-18 12:33:47,793 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.25) internal successors, (40), 31 states have internal predecessors, (40), 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) [2022-03-18 12:33:47,793 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 101 transitions. [2022-03-18 12:33:47,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-03-18 12:33:47,793 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:33:47,794 INFO L500 BasicCegarLoop]: trace histogram [8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:33:47,810 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-03-18 12:33:47,994 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-18 12:33:47,994 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:33:47,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:33:47,994 INFO L85 PathProgramCache]: Analyzing trace with hash -135474548, now seen corresponding path program 15 times [2022-03-18 12:33:47,994 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:33:47,995 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [83555778] [2022-03-18 12:33:47,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:33:47,995 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:33:48,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:33:48,137 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:33:48,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:33:48,140 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 18 proven. 30 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-18 12:33:48,140 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:33:48,140 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [83555778] [2022-03-18 12:33:48,140 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [83555778] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:33:48,140 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1873629836] [2022-03-18 12:33:48,140 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-03-18 12:33:48,140 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:33:48,140 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:33:48,141 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:33:48,142 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-18 12:33:48,211 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-03-18 12:33:48,211 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 12:33:48,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-18 12:33:48,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:33:48,337 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:33:48,337 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:33:48,675 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:33:48,676 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1873629836] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 12:33:48,676 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 12:33:48,676 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 17, 17] total 33 [2022-03-18 12:33:48,676 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802952036] [2022-03-18 12:33:48,676 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 12:33:48,676 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-03-18 12:33:48,676 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:33:48,677 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-03-18 12:33:48,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=885, Unknown=0, NotChecked=0, Total=1056 [2022-03-18 12:33:48,677 INFO L87 Difference]: Start difference. First operand 73 states and 101 transitions. Second operand has 33 states, 33 states have (on average 1.303030303030303) internal successors, (43), 32 states have internal predecessors, (43), 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) [2022-03-18 12:34:06,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:34:06,215 INFO L93 Difference]: Finished difference Result 146 states and 196 transitions. [2022-03-18 12:34:06,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2022-03-18 12:34:06,215 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.303030303030303) internal successors, (43), 32 states have internal predecessors, (43), 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 26 [2022-03-18 12:34:06,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:34:06,216 INFO L225 Difference]: With dead ends: 146 [2022-03-18 12:34:06,216 INFO L226 Difference]: Without dead ends: 131 [2022-03-18 12:34:06,219 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3028 ImplicationChecksByTransitivity, 14.0s TimeCoverageRelationStatistics Valid=1479, Invalid=10731, Unknown=0, NotChecked=0, Total=12210 [2022-03-18 12:34:06,220 INFO L912 BasicCegarLoop]: 19 mSDtfsCounter, 116 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 743 mSolverCounterSat, 272 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 1015 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 272 IncrementalHoareTripleChecker+Valid, 743 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2022-03-18 12:34:06,220 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 111 Invalid, 1015 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [272 Valid, 743 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2022-03-18 12:34:06,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2022-03-18 12:34:06,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 88. [2022-03-18 12:34:06,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 83 states have (on average 1.3373493975903614) internal successors, (111), 83 states have internal predecessors, (111), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:34:06,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 115 transitions. [2022-03-18 12:34:06,274 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 115 transitions. Word has length 26 [2022-03-18 12:34:06,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:34:06,274 INFO L478 AbstractCegarLoop]: Abstraction has 88 states and 115 transitions. [2022-03-18 12:34:06,275 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.303030303030303) internal successors, (43), 32 states have internal predecessors, (43), 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) [2022-03-18 12:34:06,275 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 115 transitions. [2022-03-18 12:34:06,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-18 12:34:06,275 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:34:06,275 INFO L500 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:34:06,292 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-03-18 12:34:06,478 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:34:06,478 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:34:06,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:34:06,479 INFO L85 PathProgramCache]: Analyzing trace with hash -992485066, now seen corresponding path program 16 times [2022-03-18 12:34:06,479 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:34:06,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [276173891] [2022-03-18 12:34:06,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:34:06,479 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:34:06,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:34:07,022 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:34:07,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:34:07,025 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:34:07,025 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:34:07,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [276173891] [2022-03-18 12:34:07,025 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [276173891] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:34:07,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [534107857] [2022-03-18 12:34:07,025 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 12:34:07,026 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:34:07,026 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:34:07,027 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:34:07,028 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-18 12:34:07,064 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 12:34:07,065 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 12:34:07,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-18 12:34:07,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:34:07,321 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:34:07,322 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:34:07,650 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:34:07,650 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [534107857] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 12:34:07,650 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 12:34:07,650 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 12, 12] total 38 [2022-03-18 12:34:07,650 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430446740] [2022-03-18 12:34:07,651 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 12:34:07,651 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-03-18 12:34:07,651 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:34:07,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-03-18 12:34:07,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1286, Unknown=0, NotChecked=0, Total=1406 [2022-03-18 12:34:07,652 INFO L87 Difference]: Start difference. First operand 88 states and 115 transitions. Second operand has 38 states, 38 states have (on average 1.605263157894737) internal successors, (61), 35 states have internal predecessors, (61), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:34:10,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:34:10,577 INFO L93 Difference]: Finished difference Result 100 states and 127 transitions. [2022-03-18 12:34:10,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-18 12:34:10,577 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.605263157894737) internal successors, (61), 35 states have internal predecessors, (61), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2022-03-18 12:34:10,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:34:10,578 INFO L225 Difference]: With dead ends: 100 [2022-03-18 12:34:10,578 INFO L226 Difference]: Without dead ends: 95 [2022-03-18 12:34:10,578 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 33 SyntacticMatches, 6 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 671 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=237, Invalid=2732, Unknown=1, NotChecked=0, Total=2970 [2022-03-18 12:34:10,579 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 22 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 602 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 625 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 602 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-18 12:34:10,579 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 109 Invalid, 625 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 602 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-18 12:34:10,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-03-18 12:34:10,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 82. [2022-03-18 12:34:10,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 77 states have (on average 1.3636363636363635) internal successors, (105), 77 states have internal predecessors, (105), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:34:10,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 109 transitions. [2022-03-18 12:34:10,623 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 109 transitions. Word has length 27 [2022-03-18 12:34:10,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:34:10,623 INFO L478 AbstractCegarLoop]: Abstraction has 82 states and 109 transitions. [2022-03-18 12:34:10,623 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.605263157894737) internal successors, (61), 35 states have internal predecessors, (61), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:34:10,623 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 109 transitions. [2022-03-18 12:34:10,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-18 12:34:10,623 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:34:10,623 INFO L500 BasicCegarLoop]: trace histogram [9, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:34:10,639 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-03-18 12:34:10,824 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:34:10,824 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:34:10,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:34:10,824 INFO L85 PathProgramCache]: Analyzing trace with hash 521429270, now seen corresponding path program 17 times [2022-03-18 12:34:10,824 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:34:10,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1998412579] [2022-03-18 12:34:10,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:34:10,825 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:34:10,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:34:11,031 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:34:11,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:34:11,034 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:34:11,035 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:34:11,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1998412579] [2022-03-18 12:34:11,035 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1998412579] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:34:11,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [581209015] [2022-03-18 12:34:11,035 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-03-18 12:34:11,035 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:34:11,035 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:34:11,036 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:34:11,037 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-18 12:34:11,206 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2022-03-18 12:34:11,206 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 12:34:11,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-18 12:34:11,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:34:11,294 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:34:11,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:34:11,667 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:34:11,668 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [581209015] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 12:34:11,668 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 12:34:11,668 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 36 [2022-03-18 12:34:11,668 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520298285] [2022-03-18 12:34:11,668 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 12:34:11,668 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-03-18 12:34:11,668 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:34:11,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-03-18 12:34:11,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=1053, Unknown=0, NotChecked=0, Total=1260 [2022-03-18 12:34:11,669 INFO L87 Difference]: Start difference. First operand 82 states and 109 transitions. Second operand has 36 states, 36 states have (on average 1.2222222222222223) internal successors, (44), 35 states have internal predecessors, (44), 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) [2022-03-18 12:34:28,231 WARN L232 SmtUtils]: Spent 10.19s on a formula simplification that was a NOOP. DAG size: 66 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 12:34:37,635 WARN L232 SmtUtils]: Spent 5.11s on a formula simplification that was a NOOP. DAG size: 63 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 12:36:03,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:36:03,671 INFO L93 Difference]: Finished difference Result 197 states and 273 transitions. [2022-03-18 12:36:03,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2022-03-18 12:36:03,671 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.2222222222222223) internal successors, (44), 35 states have internal predecessors, (44), 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 27 [2022-03-18 12:36:03,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:36:03,672 INFO L225 Difference]: With dead ends: 197 [2022-03-18 12:36:03,672 INFO L226 Difference]: Without dead ends: 192 [2022-03-18 12:36:03,674 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10109 ImplicationChecksByTransitivity, 110.6s TimeCoverageRelationStatistics Valid=6000, Invalid=23412, Unknown=0, NotChecked=0, Total=29412 [2022-03-18 12:36:03,674 INFO L912 BasicCegarLoop]: 19 mSDtfsCounter, 354 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 860 mSolverCounterSat, 686 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 354 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 1546 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 686 IncrementalHoareTripleChecker+Valid, 860 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-03-18 12:36:03,675 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [354 Valid, 116 Invalid, 1546 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [686 Valid, 860 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-03-18 12:36:03,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2022-03-18 12:36:03,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 91. [2022-03-18 12:36:03,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.372093023255814) internal successors, (118), 86 states have internal predecessors, (118), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:36:03,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 122 transitions. [2022-03-18 12:36:03,747 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 122 transitions. Word has length 27 [2022-03-18 12:36:03,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:36:03,747 INFO L478 AbstractCegarLoop]: Abstraction has 91 states and 122 transitions. [2022-03-18 12:36:03,747 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.2222222222222223) internal successors, (44), 35 states have internal predecessors, (44), 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) [2022-03-18 12:36:03,748 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 122 transitions. [2022-03-18 12:36:03,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-18 12:36:03,748 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:36:03,748 INFO L500 BasicCegarLoop]: trace histogram [9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:36:03,752 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-03-18 12:36:03,948 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:36:03,948 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:36:03,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:36:03,949 INFO L85 PathProgramCache]: Analyzing trace with hash 553613387, now seen corresponding path program 18 times [2022-03-18 12:36:03,949 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:36:03,949 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1688728310] [2022-03-18 12:36:03,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:36:03,949 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:36:03,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:36:04,133 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:36:04,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:36:04,137 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-18 12:36:04,138 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:36:04,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1688728310] [2022-03-18 12:36:04,138 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1688728310] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:36:04,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1537552689] [2022-03-18 12:36:04,138 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 12:36:04,138 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:36:04,138 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:36:04,140 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:36:04,151 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-18 12:36:04,228 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2022-03-18 12:36:04,229 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 12:36:04,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-18 12:36:04,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:36:04,361 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:36:04,361 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:36:04,764 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:36:04,764 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1537552689] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 12:36:04,764 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 12:36:04,764 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 19, 19] total 37 [2022-03-18 12:36:04,764 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798895418] [2022-03-18 12:36:04,764 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 12:36:04,764 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-03-18 12:36:04,764 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:36:04,765 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-03-18 12:36:04,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=1123, Unknown=0, NotChecked=0, Total=1332 [2022-03-18 12:36:04,765 INFO L87 Difference]: Start difference. First operand 91 states and 122 transitions. Second operand has 37 states, 37 states have (on average 1.2702702702702702) internal successors, (47), 36 states have internal predecessors, (47), 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) [2022-03-18 12:36:31,620 WARN L232 SmtUtils]: Spent 5.12s on a formula simplification that was a NOOP. DAG size: 65 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 12:36:49,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:36:49,802 INFO L93 Difference]: Finished difference Result 176 states and 229 transitions. [2022-03-18 12:36:49,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2022-03-18 12:36:49,804 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.2702702702702702) internal successors, (47), 36 states have internal predecessors, (47), 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 28 [2022-03-18 12:36:49,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:36:49,805 INFO L225 Difference]: With dead ends: 176 [2022-03-18 12:36:49,805 INFO L226 Difference]: Without dead ends: 160 [2022-03-18 12:36:49,806 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4792 ImplicationChecksByTransitivity, 34.9s TimeCoverageRelationStatistics Valid=2094, Invalid=15996, Unknown=0, NotChecked=0, Total=18090 [2022-03-18 12:36:49,806 INFO L912 BasicCegarLoop]: 22 mSDtfsCounter, 152 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 791 mSolverCounterSat, 419 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 1210 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 419 IncrementalHoareTripleChecker+Valid, 791 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.4s IncrementalHoareTripleChecker+Time [2022-03-18 12:36:49,807 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [152 Valid, 114 Invalid, 1210 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [419 Valid, 791 Invalid, 0 Unknown, 0 Unchecked, 10.4s Time] [2022-03-18 12:36:49,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2022-03-18 12:36:49,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 103. [2022-03-18 12:36:49,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.316326530612245) internal successors, (129), 98 states have internal predecessors, (129), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:36:49,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 133 transitions. [2022-03-18 12:36:49,907 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 133 transitions. Word has length 28 [2022-03-18 12:36:49,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:36:49,907 INFO L478 AbstractCegarLoop]: Abstraction has 103 states and 133 transitions. [2022-03-18 12:36:49,907 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.2702702702702702) internal successors, (47), 36 states have internal predecessors, (47), 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) [2022-03-18 12:36:49,908 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 133 transitions. [2022-03-18 12:36:49,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-18 12:36:49,908 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:36:49,908 INFO L500 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:36:49,925 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-03-18 12:36:50,110 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-03-18 12:36:50,111 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:36:50,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:36:50,111 INFO L85 PathProgramCache]: Analyzing trace with hash -412950633, now seen corresponding path program 19 times [2022-03-18 12:36:50,111 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:36:50,111 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1303186773] [2022-03-18 12:36:50,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:36:50,111 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:36:50,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:36:50,787 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:36:50,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:36:50,800 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:36:50,801 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:36:50,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1303186773] [2022-03-18 12:36:50,801 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1303186773] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:36:50,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [923159877] [2022-03-18 12:36:50,801 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-03-18 12:36:50,801 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:36:50,801 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:36:50,804 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:36:50,808 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-03-18 12:36:50,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:36:50,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 37 conjunts are in the unsatisfiable core [2022-03-18 12:36:50,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:36:51,142 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:36:51,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:36:51,509 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:36:51,510 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [923159877] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 12:36:51,510 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 12:36:51,510 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 13, 13] total 42 [2022-03-18 12:36:51,510 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [805932945] [2022-03-18 12:36:51,510 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 12:36:51,510 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-03-18 12:36:51,510 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:36:51,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-03-18 12:36:51,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=1588, Unknown=0, NotChecked=0, Total=1722 [2022-03-18 12:36:51,511 INFO L87 Difference]: Start difference. First operand 103 states and 133 transitions. Second operand has 42 states, 42 states have (on average 1.5952380952380953) internal successors, (67), 39 states have internal predecessors, (67), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:36:52,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:36:52,815 INFO L93 Difference]: Finished difference Result 126 states and 156 transitions. [2022-03-18 12:36:52,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-18 12:36:52,815 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.5952380952380953) internal successors, (67), 39 states have internal predecessors, (67), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2022-03-18 12:36:52,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:36:52,816 INFO L225 Difference]: With dead ends: 126 [2022-03-18 12:36:52,816 INFO L226 Difference]: Without dead ends: 121 [2022-03-18 12:36:52,816 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 34 SyntacticMatches, 7 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 849 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=265, Invalid=3395, Unknown=0, NotChecked=0, Total=3660 [2022-03-18 12:36:52,817 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 23 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 624 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 649 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 624 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-18 12:36:52,817 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 104 Invalid, 649 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 624 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-18 12:36:52,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2022-03-18 12:36:52,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 104. [2022-03-18 12:36:52,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 99 states have (on average 1.3131313131313131) internal successors, (130), 99 states have internal predecessors, (130), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:36:52,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 134 transitions. [2022-03-18 12:36:52,930 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 134 transitions. Word has length 29 [2022-03-18 12:36:52,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:36:52,930 INFO L478 AbstractCegarLoop]: Abstraction has 104 states and 134 transitions. [2022-03-18 12:36:52,931 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.5952380952380953) internal successors, (67), 39 states have internal predecessors, (67), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:36:52,931 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 134 transitions. [2022-03-18 12:36:52,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-03-18 12:36:52,931 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:36:52,931 INFO L500 BasicCegarLoop]: trace histogram [10, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:36:52,947 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-03-18 12:36:53,131 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-03-18 12:36:53,132 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:36:53,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:36:53,132 INFO L85 PathProgramCache]: Analyzing trace with hash -673865428, now seen corresponding path program 20 times [2022-03-18 12:36:53,132 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:36:53,132 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1324335945] [2022-03-18 12:36:53,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:36:53,132 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:36:53,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:36:53,341 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:36:53,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:36:53,349 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-18 12:36:53,349 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:36:53,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1324335945] [2022-03-18 12:36:53,350 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1324335945] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:36:53,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [550575709] [2022-03-18 12:36:53,350 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 12:36:53,350 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:36:53,350 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:36:53,351 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:36:53,352 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-03-18 12:36:53,477 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 12:36:53,477 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 12:36:53,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 39 conjunts are in the unsatisfiable core [2022-03-18 12:36:53,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:36:53,603 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:36:53,603 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:36:54,060 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:36:54,061 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [550575709] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 12:36:54,061 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 12:36:54,061 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 21, 21] total 41 [2022-03-18 12:36:54,061 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208682435] [2022-03-18 12:36:54,061 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 12:36:54,061 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-03-18 12:36:54,061 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:36:54,062 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-03-18 12:36:54,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=1389, Unknown=0, NotChecked=0, Total=1640 [2022-03-18 12:36:54,062 INFO L87 Difference]: Start difference. First operand 104 states and 134 transitions. Second operand has 41 states, 41 states have (on average 1.2439024390243902) internal successors, (51), 40 states have internal predecessors, (51), 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) [2022-03-18 12:38:05,403 WARN L232 SmtUtils]: Spent 5.32s on a formula simplification that was a NOOP. DAG size: 72 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 12:38:17,262 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 [] [2022-03-18 12:38:41,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:38:41,636 INFO L93 Difference]: Finished difference Result 192 states and 250 transitions. [2022-03-18 12:38:41,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2022-03-18 12:38:41,636 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.2439024390243902) internal successors, (51), 40 states have internal predecessors, (51), 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 30 [2022-03-18 12:38:41,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:38:41,637 INFO L225 Difference]: With dead ends: 192 [2022-03-18 12:38:41,637 INFO L226 Difference]: Without dead ends: 175 [2022-03-18 12:38:41,638 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7207 ImplicationChecksByTransitivity, 84.2s TimeCoverageRelationStatistics Valid=2894, Invalid=22866, Unknown=0, NotChecked=0, Total=25760 [2022-03-18 12:38:41,639 INFO L912 BasicCegarLoop]: 24 mSDtfsCounter, 185 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 998 mSolverCounterSat, 500 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 23.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 185 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 1499 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 500 IncrementalHoareTripleChecker+Valid, 998 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.7s IncrementalHoareTripleChecker+Time [2022-03-18 12:38:41,639 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [185 Valid, 136 Invalid, 1499 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [500 Valid, 998 Invalid, 1 Unknown, 0 Unchecked, 23.7s Time] [2022-03-18 12:38:41,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2022-03-18 12:38:41,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 106. [2022-03-18 12:38:41,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 101 states have (on average 1.297029702970297) internal successors, (131), 101 states have internal predecessors, (131), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:38:41,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 135 transitions. [2022-03-18 12:38:41,768 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 135 transitions. Word has length 30 [2022-03-18 12:38:41,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:38:41,768 INFO L478 AbstractCegarLoop]: Abstraction has 106 states and 135 transitions. [2022-03-18 12:38:41,768 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.2439024390243902) internal successors, (51), 40 states have internal predecessors, (51), 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) [2022-03-18 12:38:41,769 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 135 transitions. [2022-03-18 12:38:41,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-03-18 12:38:41,769 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:38:41,769 INFO L500 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:38:41,773 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-03-18 12:38:41,969 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:38:41,969 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:38:41,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:38:41,970 INFO L85 PathProgramCache]: Analyzing trace with hash -122528469, now seen corresponding path program 21 times [2022-03-18 12:38:41,970 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:38:41,970 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1492729685] [2022-03-18 12:38:41,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:38:41,970 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:38:41,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:38:42,218 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:38:42,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:38:42,232 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 0 proven. 137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:38:42,232 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:38:42,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1492729685] [2022-03-18 12:38:42,232 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1492729685] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:38:42,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [92137252] [2022-03-18 12:38:42,233 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-03-18 12:38:42,233 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:38:42,233 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:38:42,235 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:38:42,236 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-03-18 12:38:42,460 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-03-18 12:38:42,460 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 12:38:42,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 39 conjunts are in the unsatisfiable core [2022-03-18 12:38:42,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:38:42,564 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 0 proven. 137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:38:42,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:38:43,077 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 0 proven. 137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:38:43,078 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [92137252] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 12:38:43,078 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 12:38:43,078 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 42 [2022-03-18 12:38:43,078 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812982249] [2022-03-18 12:38:43,078 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 12:38:43,080 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-03-18 12:38:43,080 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:38:43,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-03-18 12:38:43,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=376, Invalid=1346, Unknown=0, NotChecked=0, Total=1722 [2022-03-18 12:38:43,080 INFO L87 Difference]: Start difference. First operand 106 states and 135 transitions. Second operand has 42 states, 42 states have (on average 1.1904761904761905) internal successors, (50), 41 states have internal predecessors, (50), 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) [2022-03-18 12:39:07,473 WARN L232 SmtUtils]: Spent 13.27s on a formula simplification that was a NOOP. DAG size: 76 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 12:39:20,292 WARN L232 SmtUtils]: Spent 7.95s on a formula simplification that was a NOOP. DAG size: 72 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 12:39:47,287 WARN L232 SmtUtils]: Spent 19.98s on a formula simplification that was a NOOP. DAG size: 82 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 12:39:59,569 WARN L232 SmtUtils]: Spent 5.14s on a formula simplification that was a NOOP. DAG size: 68 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 12:40:01,639 WARN L833 $PredicateComparison]: unable to prove that (and (< 0 (mod (+ 2 c_main_~y~0) 4294967296)) (= |c_#NULL.base| |c_old(#NULL.base)|) (< 0 (mod (+ 11 c_main_~y~0) 4294967296)) (< 0 (mod c_main_~y~0 4294967296)) (< 0 (mod (+ 13 c_main_~y~0) 4294967296)) (< 0 (mod (+ 3 c_main_~y~0) 4294967296)) (< 0 (mod (+ c_main_~y~0 1) 4294967296)) (< 0 (mod (+ 4294967295 c_main_~y~0) 4294967296)) (< 0 (mod (+ 15 c_main_~y~0) 4294967296)) (< 0 (mod (+ 8 c_main_~y~0) 4294967296)) (< 0 (mod c_main_~z~0 4294967296)) (< 0 (mod (+ 6 c_main_~y~0) 4294967296)) (< 0 (mod (+ 5 c_main_~y~0) 4294967296)) (< 0 (mod (+ 4 c_main_~y~0) 4294967296)) (< 0 (mod (+ 9 c_main_~y~0) 4294967296)) (< 0 (mod (+ 14 c_main_~y~0) 4294967296)) (< 0 (mod (+ 10 c_main_~y~0) 4294967296)) (= |c_#NULL.offset| |c_old(#NULL.offset)|) (< 0 (mod (+ 7 c_main_~y~0) 4294967296)) (< 0 (mod (+ 12 c_main_~y~0) 4294967296))) is different from false [2022-03-18 12:40:19,293 WARN L232 SmtUtils]: Spent 9.13s on a formula simplification that was a NOOP. DAG size: 78 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 12:40:46,127 WARN L232 SmtUtils]: Spent 8.53s on a formula simplification that was a NOOP. DAG size: 75 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 12:41:05,398 WARN L232 SmtUtils]: Spent 14.58s on a formula simplification that was a NOOP. DAG size: 74 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 12:41:27,475 WARN L232 SmtUtils]: Spent 9.42s on a formula simplification that was a NOOP. DAG size: 71 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 12:41:36,019 WARN L232 SmtUtils]: Spent 6.09s on a formula simplification that was a NOOP. DAG size: 70 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 12:42:03,967 WARN L232 SmtUtils]: Spent 14.35s on a formula simplification that was a NOOP. DAG size: 76 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 12:42:42,095 WARN L232 SmtUtils]: Spent 9.52s on a formula simplification that was a NOOP. DAG size: 72 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 12:42:52,285 WARN L232 SmtUtils]: Spent 6.22s on a formula simplification that was a NOOP. DAG size: 63 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 12:43:11,577 WARN L232 SmtUtils]: Spent 5.14s on a formula simplification that was a NOOP. DAG size: 68 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 12:43:58,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:43:58,686 INFO L93 Difference]: Finished difference Result 269 states and 363 transitions. [2022-03-18 12:43:58,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2022-03-18 12:43:58,687 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.1904761904761905) internal successors, (50), 41 states have internal predecessors, (50), 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 30 [2022-03-18 12:43:58,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:43:58,688 INFO L225 Difference]: With dead ends: 269 [2022-03-18 12:43:58,688 INFO L226 Difference]: Without dead ends: 264 [2022-03-18 12:43:58,693 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 154 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 7209 ImplicationChecksByTransitivity, 313.1s TimeCoverageRelationStatistics Valid=5213, Invalid=18658, Unknown=3, NotChecked=306, Total=24180 [2022-03-18 12:43:58,694 INFO L912 BasicCegarLoop]: 36 mSDtfsCounter, 1025 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 1429 mSolverCounterSat, 665 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1025 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 2095 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 665 IncrementalHoareTripleChecker+Valid, 1429 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-03-18 12:43:58,694 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1025 Valid, 171 Invalid, 2095 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [665 Valid, 1429 Invalid, 0 Unknown, 1 Unchecked, 2.7s Time] [2022-03-18 12:43:58,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2022-03-18 12:43:58,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 121. [2022-03-18 12:43:58,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 116 states have (on average 1.3275862068965518) internal successors, (154), 116 states have internal predecessors, (154), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:43:58,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 158 transitions. [2022-03-18 12:43:58,837 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 158 transitions. Word has length 30 [2022-03-18 12:43:58,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:43:58,837 INFO L478 AbstractCegarLoop]: Abstraction has 121 states and 158 transitions. [2022-03-18 12:43:58,837 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.1904761904761905) internal successors, (50), 41 states have internal predecessors, (50), 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) [2022-03-18 12:43:58,837 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 158 transitions. [2022-03-18 12:43:58,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-18 12:43:58,837 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:43:58,837 INFO L500 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:43:58,844 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-03-18 12:43:59,038 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:43:59,038 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:43:59,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:43:59,038 INFO L85 PathProgramCache]: Analyzing trace with hash 187068054, now seen corresponding path program 22 times [2022-03-18 12:43:59,038 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:43:59,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1340770730] [2022-03-18 12:43:59,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:43:59,038 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:43:59,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:43:59,764 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:43:59,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:43:59,767 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:43:59,767 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:43:59,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1340770730] [2022-03-18 12:43:59,767 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1340770730] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:43:59,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1512306486] [2022-03-18 12:43:59,767 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 12:43:59,767 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:43:59,767 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:43:59,768 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:43:59,769 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-03-18 12:43:59,804 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 12:43:59,804 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 12:43:59,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 41 conjunts are in the unsatisfiable core [2022-03-18 12:43:59,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:44:00,163 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:44:00,163 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:44:00,756 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:44:00,756 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1512306486] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 12:44:00,756 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 12:44:00,756 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 14, 14] total 46 [2022-03-18 12:44:00,756 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890919382] [2022-03-18 12:44:00,757 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 12:44:00,757 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-03-18 12:44:00,757 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:44:00,757 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-03-18 12:44:00,758 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=1922, Unknown=0, NotChecked=0, Total=2070 [2022-03-18 12:44:00,758 INFO L87 Difference]: Start difference. First operand 121 states and 158 transitions. Second operand has 46 states, 46 states have (on average 1.5869565217391304) internal successors, (73), 43 states have internal predecessors, (73), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:44:03,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:44:03,797 INFO L93 Difference]: Finished difference Result 137 states and 174 transitions. [2022-03-18 12:44:03,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-03-18 12:44:03,798 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.5869565217391304) internal successors, (73), 43 states have internal predecessors, (73), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2022-03-18 12:44:03,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:44:03,798 INFO L225 Difference]: With dead ends: 137 [2022-03-18 12:44:03,798 INFO L226 Difference]: Without dead ends: 132 [2022-03-18 12:44:03,799 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 34 SyntacticMatches, 9 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1049 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=293, Invalid=4129, Unknown=0, NotChecked=0, Total=4422 [2022-03-18 12:44:03,799 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 24 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 971 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 998 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 971 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-18 12:44:03,799 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 144 Invalid, 998 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 971 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-18 12:44:03,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2022-03-18 12:44:03,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 113. [2022-03-18 12:44:03,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 108 states have (on average 1.3518518518518519) internal successors, (146), 108 states have internal predecessors, (146), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:44:03,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 150 transitions. [2022-03-18 12:44:03,923 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 150 transitions. Word has length 31 [2022-03-18 12:44:03,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:44:03,923 INFO L478 AbstractCegarLoop]: Abstraction has 113 states and 150 transitions. [2022-03-18 12:44:03,923 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.5869565217391304) internal successors, (73), 43 states have internal predecessors, (73), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:44:03,923 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 150 transitions. [2022-03-18 12:44:03,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-18 12:44:03,924 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:44:03,924 INFO L500 BasicCegarLoop]: trace histogram [12, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:44:03,943 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-03-18 12:44:04,135 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-03-18 12:44:04,135 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:44:04,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:44:04,135 INFO L85 PathProgramCache]: Analyzing trace with hash -1347612073, now seen corresponding path program 23 times [2022-03-18 12:44:04,135 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:44:04,136 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1386767381] [2022-03-18 12:44:04,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:44:04,136 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:44:04,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:44:04,456 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:44:04,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:44:04,461 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:44:04,461 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:44:04,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1386767381] [2022-03-18 12:44:04,461 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1386767381] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:44:04,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1786437517] [2022-03-18 12:44:04,461 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-03-18 12:44:04,461 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:44:04,462 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:44:04,463 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:44:04,464 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-03-18 12:44:04,922 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2022-03-18 12:44:04,922 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 12:44:04,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 41 conjunts are in the unsatisfiable core [2022-03-18 12:44:04,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:44:05,021 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:44:05,021 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:44:05,544 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:44:05,544 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1786437517] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 12:44:05,544 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 12:44:05,544 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 44 [2022-03-18 12:44:05,545 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958641651] [2022-03-18 12:44:05,545 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-18 12:44:05,545 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-03-18 12:44:05,545 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:44:05,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-03-18 12:44:05,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=1584, Unknown=0, NotChecked=0, Total=1892 [2022-03-18 12:44:05,546 INFO L87 Difference]: Start difference. First operand 113 states and 150 transitions. Second operand has 44 states, 44 states have (on average 1.1818181818181819) internal successors, (52), 43 states have internal predecessors, (52), 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) [2022-03-18 12:44:54,311 WARN L232 SmtUtils]: Spent 20.34s on a formula simplification that was a NOOP. DAG size: 81 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 12:45:22,707 WARN L232 SmtUtils]: Spent 15.93s on a formula simplification that was a NOOP. DAG size: 78 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 12:45:48,041 WARN L232 SmtUtils]: Spent 18.98s on a formula simplification that was a NOOP. DAG size: 77 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 12:46:07,169 WARN L232 SmtUtils]: Spent 9.94s on a formula simplification that was a NOOP. DAG size: 75 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 12:46:29,813 WARN L232 SmtUtils]: Spent 10.58s on a formula simplification that was a NOOP. DAG size: 74 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 12:46:31,870 WARN L833 $PredicateComparison]: unable to prove that (and (< 0 (mod (+ 2 c_main_~y~0) 4294967296)) (< 0 (mod (+ 4294967295 c_main_~z~0) 4294967296)) (= |c_#NULL.base| |c_old(#NULL.base)|) (< 0 (mod (+ 4294967294 c_main_~z~0) 4294967296)) (< 0 (mod c_main_~y~0 4294967296)) (< 0 (mod (+ 4294967294 c_main_~y~0) 4294967296)) (< 0 (mod (+ 3 c_main_~y~0) 4294967296)) (< 0 (mod (+ 4294967292 c_main_~z~0) 4294967296)) (< 0 (mod (+ 4294967290 c_main_~y~0) 4294967296)) (< 0 (mod (+ 4294967292 c_main_~y~0) 4294967296)) (< 0 (mod (+ c_main_~y~0 4294967293) 4294967296)) (< 0 (mod (+ 4294967290 c_main_~z~0) 4294967296)) (< 0 (mod (+ c_main_~y~0 1) 4294967296)) (< 0 (mod (+ 4294967291 c_main_~y~0) 4294967296)) (< 0 (mod (+ 4294967295 c_main_~y~0) 4294967296)) (< 0 (mod c_main_~z~0 4294967296)) (< 0 (mod (+ 4294967293 c_main_~z~0) 4294967296)) (< 0 (mod (+ 4 c_main_~y~0) 4294967296)) (= |c_#NULL.offset| |c_old(#NULL.offset)|) (< 0 (mod (+ 4294967291 c_main_~z~0) 4294967296))) is different from false [2022-03-18 12:46:50,035 WARN L232 SmtUtils]: Spent 9.21s on a formula simplification that was a NOOP. DAG size: 72 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)