/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/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/loopacceleration/qvasr/qvasr_64.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/dijkstra-u_unwindbound100.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-34549b5 [2022-04-06 11:05:56,800 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-06 11:05:56,803 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-06 11:05:56,846 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-04-06 11:05:56,847 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-04-06 11:05:56,848 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-04-06 11:05:56,850 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-04-06 11:05:56,853 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-04-06 11:05:56,854 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-04-06 11:05:56,858 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-04-06 11:05:56,859 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-04-06 11:05:56,860 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-04-06 11:05:56,861 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-04-06 11:05:56,863 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-04-06 11:05:56,863 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-04-06 11:05:56,866 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-04-06 11:05:56,866 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-04-06 11:05:56,867 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-04-06 11:05:56,869 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-04-06 11:05:56,873 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-04-06 11:05:56,875 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-04-06 11:05:56,876 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-04-06 11:05:56,877 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-04-06 11:05:56,877 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-04-06 11:05:56,879 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-04-06 11:05:56,884 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2022-04-06 11:05:56,892 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-04-06 11:05:56,892 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-04-06 11:05:56,893 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-04-06 11:05:56,894 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/loopacceleration/qvasr/qvasr_64.epf [2022-04-06 11:05:56,920 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-06 11:05:56,920 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-06 11:05:56,921 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-04-06 11:05:56,922 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-04-06 11:05:56,923 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-04-06 11:05:56,923 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-04-06 11:05:56,923 INFO L138 SettingsManager]: * Use SBE=true [2022-04-06 11:05:56,925 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-06 11:05:56,925 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-06 11:05:56,926 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-06 11:05:56,926 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-06 11:05:56,927 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-06 11:05:56,927 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-06 11:05:56,927 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-06 11:05:56,927 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-06 11:05:56,927 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-06 11:05:56,927 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-06 11:05:56,928 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-06 11:05:56,928 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-06 11:05:56,928 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 11:05:56,928 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-06 11:05:56,928 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-04-06 11:05:56,928 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-04-06 11:05:56,929 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-04-06 11:05:56,929 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-04-06 11:05:56,929 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-06 11:05:56,929 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-04-06 11:05:56,929 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-04-06 11:05:56,930 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2022-04-06 11:05:56,930 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_QVASR WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-06 11:05:57,150 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-06 11:05:57,174 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-06 11:05:57,178 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-06 11:05:57,179 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-06 11:05:57,180 INFO L275 PluginConnector]: CDTParser initialized [2022-04-06 11:05:57,181 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/dijkstra-u_unwindbound100.c [2022-04-06 11:05:57,230 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/70959f1cb/630671632f0e4f7b8895f314a1bbf077/FLAG2260a8586 [2022-04-06 11:05:57,618 INFO L306 CDTParser]: Found 1 translation units. [2022-04-06 11:05:57,618 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/dijkstra-u_unwindbound100.c [2022-04-06 11:05:57,626 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/70959f1cb/630671632f0e4f7b8895f314a1bbf077/FLAG2260a8586 [2022-04-06 11:05:57,637 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/70959f1cb/630671632f0e4f7b8895f314a1bbf077 [2022-04-06 11:05:57,639 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-06 11:05:57,640 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2022-04-06 11:05:57,642 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-06 11:05:57,642 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-06 11:05:57,645 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-06 11:05:57,645 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 11:05:57" (1/1) ... [2022-04-06 11:05:57,646 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@67438da9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 11:05:57, skipping insertion in model container [2022-04-06 11:05:57,647 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 11:05:57" (1/1) ... [2022-04-06 11:05:57,652 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-06 11:05:57,665 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-06 11:05:57,803 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/dijkstra-u_unwindbound100.c[525,538] [2022-04-06 11:05:57,841 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 11:05:57,848 INFO L203 MainTranslator]: Completed pre-run [2022-04-06 11:05:57,855 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/dijkstra-u_unwindbound100.c[525,538] [2022-04-06 11:05:57,868 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 11:05:57,879 INFO L208 MainTranslator]: Completed translation [2022-04-06 11:05:57,880 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 11:05:57 WrapperNode [2022-04-06 11:05:57,880 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-06 11:05:57,881 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-06 11:05:57,881 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-06 11:05:57,881 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-06 11:05:57,892 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 11:05:57" (1/1) ... [2022-04-06 11:05:57,892 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 11:05:57" (1/1) ... [2022-04-06 11:05:57,897 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 11:05:57" (1/1) ... [2022-04-06 11:05:57,897 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 11:05:57" (1/1) ... [2022-04-06 11:05:57,902 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 11:05:57" (1/1) ... [2022-04-06 11:05:57,906 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 11:05:57" (1/1) ... [2022-04-06 11:05:57,907 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 11:05:57" (1/1) ... [2022-04-06 11:05:57,909 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-06 11:05:57,909 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-06 11:05:57,909 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-06 11:05:57,910 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-06 11:05:57,910 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 11:05:57" (1/1) ... [2022-04-06 11:05:57,916 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 11:05:57,931 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 11:05:57,941 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-04-06 11:05:57,943 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-04-06 11:05:57,968 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-06 11:05:57,969 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-06 11:05:57,969 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-06 11:05:57,969 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-04-06 11:05:57,969 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-06 11:05:57,969 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-06 11:05:57,969 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-06 11:05:57,969 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-06 11:05:57,969 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-06 11:05:57,970 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-06 11:05:57,970 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-04-06 11:05:57,970 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-04-06 11:05:57,970 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-06 11:05:57,970 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-06 11:05:57,970 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-06 11:05:57,970 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-06 11:05:57,970 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-06 11:05:57,970 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-06 11:05:57,970 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-06 11:05:57,970 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-06 11:05:58,023 INFO L234 CfgBuilder]: Building ICFG [2022-04-06 11:05:58,024 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-06 11:05:58,240 INFO L275 CfgBuilder]: Performing block encoding [2022-04-06 11:05:58,248 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-06 11:05:58,248 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-04-06 11:05:58,249 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 11:05:58 BoogieIcfgContainer [2022-04-06 11:05:58,250 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-06 11:05:58,250 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2022-04-06 11:05:58,250 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2022-04-06 11:05:58,251 INFO L275 PluginConnector]: IcfgTransformer initialized [2022-04-06 11:05:58,254 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 11:05:58" (1/1) ... [2022-04-06 11:05:58,256 INFO L168 ansformationObserver]: Applying ICFG transformation LOOP_ACCELERATION_QVASR [2022-04-06 11:05:58,274 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.04 11:05:58 BasicIcfg [2022-04-06 11:05:58,274 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2022-04-06 11:05:58,276 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-06 11:05:58,276 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-06 11:05:58,278 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-06 11:05:58,278 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.04 11:05:57" (1/4) ... [2022-04-06 11:05:58,279 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c1f7b8e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 11:05:58, skipping insertion in model container [2022-04-06 11:05:58,279 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 11:05:57" (2/4) ... [2022-04-06 11:05:58,279 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c1f7b8e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 11:05:58, skipping insertion in model container [2022-04-06 11:05:58,279 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 11:05:58" (3/4) ... [2022-04-06 11:05:58,280 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c1f7b8e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.04 11:05:58, skipping insertion in model container [2022-04-06 11:05:58,280 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.04 11:05:58" (4/4) ... [2022-04-06 11:05:58,281 INFO L111 eAbstractionObserver]: Analyzing ICFG dijkstra-u_unwindbound100.cqvasr [2022-04-06 11:05:58,285 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-04-06 11:05:58,285 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-06 11:05:58,325 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-06 11:05:58,331 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=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-04-06 11:05:58,331 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-06 11:05:58,345 INFO L276 IsEmpty]: Start isEmpty. Operand has 39 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-04-06 11:05:58,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-04-06 11:05:58,350 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 11:05:58,350 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 11:05:58,351 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 11:05:58,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 11:05:58,355 INFO L85 PathProgramCache]: Analyzing trace with hash -460462115, now seen corresponding path program 1 times [2022-04-06 11:05:58,362 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 11:05:58,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1981516063] [2022-04-06 11:05:58,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 11:05:58,364 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 11:05:58,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 11:05:58,538 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 11:05:58,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 11:05:58,551 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-06 11:05:58,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 11:05:58,568 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 11:05:58,568 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 11:05:58,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1981516063] [2022-04-06 11:05:58,570 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1981516063] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 11:05:58,570 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 11:05:58,570 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 11:05:58,572 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [454648441] [2022-04-06 11:05:58,573 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 11:05:58,577 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-04-06 11:05:58,577 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 11:05:58,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-04-06 11:05:58,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 11:05:58,611 INFO L87 Difference]: Start difference. First operand has 39 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-06 11:06:00,689 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 11:06:00,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 11:06:00,950 INFO L93 Difference]: Finished difference Result 70 states and 111 transitions. [2022-04-06 11:06:00,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-04-06 11:06:00,955 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2022-04-06 11:06:00,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 11:06:00,963 INFO L225 Difference]: With dead ends: 70 [2022-04-06 11:06:00,963 INFO L226 Difference]: Without dead ends: 35 [2022-04-06 11:06:00,965 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 11:06:00,967 INFO L913 BasicCegarLoop]: 49 mSDtfsCounter, 10 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 11 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-04-06 11:06:00,968 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 53 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 25 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2022-04-06 11:06:00,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-04-06 11:06:01,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2022-04-06 11:06:01,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-04-06 11:06:01,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 46 transitions. [2022-04-06 11:06:01,016 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 46 transitions. Word has length 18 [2022-04-06 11:06:01,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 11:06:01,016 INFO L478 AbstractCegarLoop]: Abstraction has 34 states and 46 transitions. [2022-04-06 11:06:01,016 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-06 11:06:01,016 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 46 transitions. [2022-04-06 11:06:01,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-04-06 11:06:01,017 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 11:06:01,017 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 11:06:01,018 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-06 11:06:01,018 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 11:06:01,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 11:06:01,018 INFO L85 PathProgramCache]: Analyzing trace with hash -889932734, now seen corresponding path program 1 times [2022-04-06 11:06:01,019 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 11:06:01,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [333432343] [2022-04-06 11:06:01,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 11:06:01,019 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 11:06:01,041 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 11:06:01,042 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [158424928] [2022-04-06 11:06:01,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 11:06:01,043 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 11:06:01,043 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 11:06:01,045 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 11:06:01,046 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-04-06 11:06:01,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 11:06:01,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 5 conjunts are in the unsatisfiable core [2022-04-06 11:06:01,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 11:06:01,186 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 11:06:01,186 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 11:06:01,186 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 11:06:01,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [333432343] [2022-04-06 11:06:01,187 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 11:06:01,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [158424928] [2022-04-06 11:06:01,187 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [158424928] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 11:06:01,187 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 11:06:01,188 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-04-06 11:06:01,188 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444168717] [2022-04-06 11:06:01,189 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 11:06:01,189 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-04-06 11:06:01,189 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 11:06:01,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-04-06 11:06:01,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-04-06 11:06:01,190 INFO L87 Difference]: Start difference. First operand 34 states and 46 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 11:06:01,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 11:06:01,206 INFO L93 Difference]: Finished difference Result 55 states and 78 transitions. [2022-04-06 11:06:01,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-04-06 11:06:01,206 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2022-04-06 11:06:01,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 11:06:01,207 INFO L225 Difference]: With dead ends: 55 [2022-04-06 11:06:01,207 INFO L226 Difference]: Without dead ends: 36 [2022-04-06 11:06:01,208 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-04-06 11:06:01,209 INFO L913 BasicCegarLoop]: 44 mSDtfsCounter, 0 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 11:06:01,210 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 119 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 11:06:01,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-04-06 11:06:01,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2022-04-06 11:06:01,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 20 states have (on average 1.3) internal successors, (26), 21 states have internal predecessors, (26), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-04-06 11:06:01,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 48 transitions. [2022-04-06 11:06:01,218 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 48 transitions. Word has length 20 [2022-04-06 11:06:01,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 11:06:01,219 INFO L478 AbstractCegarLoop]: Abstraction has 36 states and 48 transitions. [2022-04-06 11:06:01,219 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 11:06:01,220 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 48 transitions. [2022-04-06 11:06:01,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-04-06 11:06:01,220 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 11:06:01,220 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 11:06:01,239 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-04-06 11:06:01,422 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 11:06:01,423 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 11:06:01,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 11:06:01,427 INFO L85 PathProgramCache]: Analyzing trace with hash 1699853977, now seen corresponding path program 1 times [2022-04-06 11:06:01,427 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 11:06:01,427 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1125867881] [2022-04-06 11:06:01,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 11:06:01,428 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 11:06:01,450 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 11:06:01,450 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1941220799] [2022-04-06 11:06:01,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 11:06:01,451 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 11:06:01,451 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 11:06:01,453 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 11:06:01,454 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-04-06 11:06:01,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 11:06:01,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-06 11:06:01,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 11:06:01,586 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 11:06:01,586 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 11:06:01,586 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 11:06:01,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1125867881] [2022-04-06 11:06:01,587 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 11:06:01,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1941220799] [2022-04-06 11:06:01,587 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1941220799] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 11:06:01,587 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 11:06:01,587 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 11:06:01,587 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1323454390] [2022-04-06 11:06:01,587 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 11:06:01,588 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 11:06:01,588 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 11:06:01,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 11:06:01,589 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-04-06 11:06:01,589 INFO L87 Difference]: Start difference. First operand 36 states and 48 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 11:06:01,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 11:06:01,629 INFO L93 Difference]: Finished difference Result 49 states and 64 transitions. [2022-04-06 11:06:01,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 11:06:01,632 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2022-04-06 11:06:01,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 11:06:01,636 INFO L225 Difference]: With dead ends: 49 [2022-04-06 11:06:01,636 INFO L226 Difference]: Without dead ends: 40 [2022-04-06 11:06:01,638 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-04-06 11:06:01,639 INFO L913 BasicCegarLoop]: 43 mSDtfsCounter, 7 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 11:06:01,639 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 149 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 11:06:01,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-04-06 11:06:01,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2022-04-06 11:06:01,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-04-06 11:06:01,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 52 transitions. [2022-04-06 11:06:01,646 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 52 transitions. Word has length 21 [2022-04-06 11:06:01,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 11:06:01,646 INFO L478 AbstractCegarLoop]: Abstraction has 39 states and 52 transitions. [2022-04-06 11:06:01,647 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 11:06:01,647 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 52 transitions. [2022-04-06 11:06:01,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-04-06 11:06:01,650 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 11:06:01,650 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 11:06:01,667 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-04-06 11:06:01,855 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,SelfDestructingSolverStorable2 [2022-04-06 11:06:01,856 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 11:06:01,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 11:06:01,857 INFO L85 PathProgramCache]: Analyzing trace with hash 1700986035, now seen corresponding path program 1 times [2022-04-06 11:06:01,857 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 11:06:01,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1010090899] [2022-04-06 11:06:01,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 11:06:01,858 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 11:06:01,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 11:06:02,052 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 11:06:02,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 11:06:02,059 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-06 11:06:02,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 11:06:02,064 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 11:06:02,065 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 11:06:02,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1010090899] [2022-04-06 11:06:02,065 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1010090899] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 11:06:02,065 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 11:06:02,066 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-04-06 11:06:02,066 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535473090] [2022-04-06 11:06:02,066 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 11:06:02,066 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-04-06 11:06:02,066 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 11:06:02,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-04-06 11:06:02,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-04-06 11:06:02,067 INFO L87 Difference]: Start difference. First operand 39 states and 52 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-06 11:06:04,183 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 11:06:06,186 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 11:06:08,189 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 11:06:11,515 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 11:06:13,518 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 11:06:15,520 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 11:06:19,444 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 11:06:21,478 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 11:06:23,481 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 11:06:23,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 11:06:23,571 INFO L93 Difference]: Finished difference Result 72 states and 104 transitions. [2022-04-06 11:06:23,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-04-06 11:06:23,572 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 21 [2022-04-06 11:06:23,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 11:06:23,573 INFO L225 Difference]: With dead ends: 72 [2022-04-06 11:06:23,574 INFO L226 Difference]: Without dead ends: 51 [2022-04-06 11:06:23,574 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2022-04-06 11:06:23,576 INFO L913 BasicCegarLoop]: 45 mSDtfsCounter, 24 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 191 mSolverCounterSat, 40 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 191 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.4s IncrementalHoareTripleChecker+Time [2022-04-06 11:06:23,576 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 98 Invalid, 240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 191 Invalid, 9 Unknown, 0 Unchecked, 21.4s Time] [2022-04-06 11:06:23,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-04-06 11:06:23,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-04-06 11:06:23,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 27 states have (on average 1.2592592592592593) internal successors, (34), 29 states have internal predecessors, (34), 19 states have call successors, (19), 5 states have call predecessors, (19), 4 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2022-04-06 11:06:23,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 69 transitions. [2022-04-06 11:06:23,593 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 69 transitions. Word has length 21 [2022-04-06 11:06:23,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 11:06:23,594 INFO L478 AbstractCegarLoop]: Abstraction has 51 states and 69 transitions. [2022-04-06 11:06:23,594 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-06 11:06:23,594 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 69 transitions. [2022-04-06 11:06:23,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-04-06 11:06:23,595 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 11:06:23,595 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 11:06:23,595 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-04-06 11:06:23,595 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 11:06:23,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 11:06:23,596 INFO L85 PathProgramCache]: Analyzing trace with hash 1908885951, now seen corresponding path program 1 times [2022-04-06 11:06:23,596 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 11:06:23,596 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1087392392] [2022-04-06 11:06:23,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 11:06:23,596 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 11:06:23,616 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 11:06:23,616 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [254752725] [2022-04-06 11:06:23,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 11:06:23,616 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 11:06:23,616 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 11:06:23,624 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 11:06:23,628 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-04-06 11:06:23,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 11:06:23,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-06 11:06:23,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 11:06:23,739 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 11:06:23,739 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 11:06:23,812 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 11:06:23,813 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 11:06:23,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1087392392] [2022-04-06 11:06:23,813 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 11:06:23,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [254752725] [2022-04-06 11:06:23,813 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [254752725] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 11:06:23,814 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 11:06:23,814 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2022-04-06 11:06:23,814 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2047407845] [2022-04-06 11:06:23,814 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-04-06 11:06:23,815 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-04-06 11:06:23,815 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 11:06:23,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-04-06 11:06:23,815 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-04-06 11:06:23,816 INFO L87 Difference]: Start difference. First operand 51 states and 69 transitions. Second operand has 8 states, 8 states have (on average 3.625) internal successors, (29), 8 states have internal predecessors, (29), 4 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2022-04-06 11:06:28,131 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 11:06:30,133 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 11:06:32,135 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 11:06:32,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 11:06:32,290 INFO L93 Difference]: Finished difference Result 100 states and 138 transitions. [2022-04-06 11:06:32,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-04-06 11:06:32,291 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.625) internal successors, (29), 8 states have internal predecessors, (29), 4 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 23 [2022-04-06 11:06:32,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 11:06:32,293 INFO L225 Difference]: With dead ends: 100 [2022-04-06 11:06:32,293 INFO L226 Difference]: Without dead ends: 81 [2022-04-06 11:06:32,293 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2022-04-06 11:06:32,296 INFO L913 BasicCegarLoop]: 59 mSDtfsCounter, 50 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 11 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 282 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.4s IncrementalHoareTripleChecker+Time [2022-04-06 11:06:32,296 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 282 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 79 Invalid, 3 Unknown, 0 Unchecked, 8.4s Time] [2022-04-06 11:06:32,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-04-06 11:06:32,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 76. [2022-04-06 11:06:32,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 47 states have internal predecessors, (55), 26 states have call successors, (26), 7 states have call predecessors, (26), 6 states have return successors, (22), 21 states have call predecessors, (22), 22 states have call successors, (22) [2022-04-06 11:06:32,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 103 transitions. [2022-04-06 11:06:32,310 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 103 transitions. Word has length 23 [2022-04-06 11:06:32,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 11:06:32,310 INFO L478 AbstractCegarLoop]: Abstraction has 76 states and 103 transitions. [2022-04-06 11:06:32,311 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.625) internal successors, (29), 8 states have internal predecessors, (29), 4 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2022-04-06 11:06:32,311 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 103 transitions. [2022-04-06 11:06:32,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-04-06 11:06:32,312 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 11:06:32,312 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 11:06:32,334 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-04-06 11:06:32,527 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 11:06:32,528 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 11:06:32,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 11:06:32,528 INFO L85 PathProgramCache]: Analyzing trace with hash -1731080004, now seen corresponding path program 1 times [2022-04-06 11:06:32,528 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 11:06:32,528 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [881021395] [2022-04-06 11:06:32,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 11:06:32,529 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 11:06:32,538 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 11:06:32,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1133962580] [2022-04-06 11:06:32,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 11:06:32,538 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 11:06:32,539 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 11:06:32,539 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 11:06:32,541 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-04-06 11:06:32,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 11:06:32,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 9 conjunts are in the unsatisfiable core [2022-04-06 11:06:32,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 11:06:32,646 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 11:06:32,646 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 11:06:32,739 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 11:06:32,740 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 11:06:32,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [881021395] [2022-04-06 11:06:32,740 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 11:06:32,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1133962580] [2022-04-06 11:06:32,740 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1133962580] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 11:06:32,740 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 11:06:32,740 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2022-04-06 11:06:32,741 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521065767] [2022-04-06 11:06:32,741 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-04-06 11:06:32,741 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-04-06 11:06:32,741 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 11:06:32,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-04-06 11:06:32,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-04-06 11:06:32,742 INFO L87 Difference]: Start difference. First operand 76 states and 103 transitions. Second operand has 10 states, 10 states have (on average 3.3) internal successors, (33), 10 states have internal predecessors, (33), 4 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2022-04-06 11:06:35,004 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 11:06:36,300 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.30s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 11:06:42,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 11:06:42,864 INFO L93 Difference]: Finished difference Result 149 states and 205 transitions. [2022-04-06 11:06:42,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-04-06 11:06:42,864 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 10 states have internal predecessors, (33), 4 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 24 [2022-04-06 11:06:42,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 11:06:42,866 INFO L225 Difference]: With dead ends: 149 [2022-04-06 11:06:42,866 INFO L226 Difference]: Without dead ends: 133 [2022-04-06 11:06:42,866 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2022-04-06 11:06:42,867 INFO L913 BasicCegarLoop]: 78 mSDtfsCounter, 154 mSDsluCounter, 249 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 79 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 154 SdHoareTripleChecker+Valid, 327 SdHoareTripleChecker+Invalid, 235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.1s IncrementalHoareTripleChecker+Time [2022-04-06 11:06:42,868 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [154 Valid, 327 Invalid, 235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 155 Invalid, 1 Unknown, 0 Unchecked, 10.1s Time] [2022-04-06 11:06:42,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2022-04-06 11:06:42,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 124. [2022-04-06 11:06:42,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 68 states have (on average 1.338235294117647) internal successors, (91), 73 states have internal predecessors, (91), 46 states have call successors, (46), 10 states have call predecessors, (46), 9 states have return successors, (40), 40 states have call predecessors, (40), 40 states have call successors, (40) [2022-04-06 11:06:42,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 177 transitions. [2022-04-06 11:06:42,891 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 177 transitions. Word has length 24 [2022-04-06 11:06:42,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 11:06:42,891 INFO L478 AbstractCegarLoop]: Abstraction has 124 states and 177 transitions. [2022-04-06 11:06:42,892 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 10 states have internal predecessors, (33), 4 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2022-04-06 11:06:42,892 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 177 transitions. [2022-04-06 11:06:42,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-04-06 11:06:42,892 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 11:06:42,893 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 11:06:42,918 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-04-06 11:06:43,113 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 11:06:43,113 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 11:06:43,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 11:06:43,114 INFO L85 PathProgramCache]: Analyzing trace with hash -1729947946, now seen corresponding path program 1 times [2022-04-06 11:06:43,114 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 11:06:43,114 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1735114941] [2022-04-06 11:06:43,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 11:06:43,114 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 11:06:43,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 11:06:43,300 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 11:06:43,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 11:06:43,313 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-06 11:06:43,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 11:06:43,324 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 11:06:43,324 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 11:06:43,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1735114941] [2022-04-06 11:06:43,324 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1735114941] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 11:06:43,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1051159992] [2022-04-06 11:06:43,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 11:06:43,325 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 11:06:43,325 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 11:06:43,326 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 11:06:43,358 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-04-06 11:06:43,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 11:06:43,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 12 conjunts are in the unsatisfiable core [2022-04-06 11:06:43,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 11:06:43,543 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 11:06:43,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 11:06:43,717 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 11:06:43,718 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1051159992] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 11:06:43,718 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 11:06:43,718 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 15 [2022-04-06 11:06:43,718 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [942727738] [2022-04-06 11:06:43,718 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 11:06:43,718 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-04-06 11:06:43,719 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 11:06:43,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-04-06 11:06:43,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2022-04-06 11:06:43,719 INFO L87 Difference]: Start difference. First operand 124 states and 177 transitions. Second operand has 15 states, 15 states have (on average 2.4) internal successors, (36), 12 states have internal predecessors, (36), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-06 11:06:48,079 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 11:06:50,082 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 11:06:52,089 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 11:06:54,187 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 11:06:57,062 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 11:06:59,257 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 11:07:01,261 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 11:07:03,264 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 11:07:05,267 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 11:07:07,302 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 11:07:09,430 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 11:07:13,657 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 11:07:16,171 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.57s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 11:07:18,040 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.87s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 11:07:18,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 11:07:18,829 INFO L93 Difference]: Finished difference Result 198 states and 288 transitions. [2022-04-06 11:07:18,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-04-06 11:07:18,830 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 12 states have internal predecessors, (36), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 24 [2022-04-06 11:07:18,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 11:07:18,832 INFO L225 Difference]: With dead ends: 198 [2022-04-06 11:07:18,832 INFO L226 Difference]: Without dead ends: 181 [2022-04-06 11:07:18,834 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=95, Invalid=367, Unknown=0, NotChecked=0, Total=462 [2022-04-06 11:07:18,835 INFO L913 BasicCegarLoop]: 59 mSDtfsCounter, 50 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 538 mSolverCounterSat, 142 mSolverCounterUnsat, 12 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 34.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 692 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 142 IncrementalHoareTripleChecker+Valid, 538 IncrementalHoareTripleChecker+Invalid, 12 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 35.0s IncrementalHoareTripleChecker+Time [2022-04-06 11:07:18,835 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 163 Invalid, 692 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [142 Valid, 538 Invalid, 12 Unknown, 0 Unchecked, 35.0s Time] [2022-04-06 11:07:18,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2022-04-06 11:07:18,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 174. [2022-04-06 11:07:18,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 95 states have (on average 1.2736842105263158) internal successors, (121), 103 states have internal predecessors, (121), 65 states have call successors, (65), 14 states have call predecessors, (65), 13 states have return successors, (57), 56 states have call predecessors, (57), 57 states have call successors, (57) [2022-04-06 11:07:18,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 243 transitions. [2022-04-06 11:07:18,871 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 243 transitions. Word has length 24 [2022-04-06 11:07:18,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 11:07:18,873 INFO L478 AbstractCegarLoop]: Abstraction has 174 states and 243 transitions. [2022-04-06 11:07:18,873 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 12 states have internal predecessors, (36), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-06 11:07:18,873 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 243 transitions. [2022-04-06 11:07:18,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-04-06 11:07:18,878 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 11:07:18,878 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 11:07:18,904 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-04-06 11:07:19,091 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 11:07:19,092 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 11:07:19,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 11:07:19,092 INFO L85 PathProgramCache]: Analyzing trace with hash -2026335537, now seen corresponding path program 1 times [2022-04-06 11:07:19,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 11:07:19,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1155137631] [2022-04-06 11:07:19,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 11:07:19,092 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 11:07:19,101 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 11:07:19,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [150871279] [2022-04-06 11:07:19,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 11:07:19,101 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 11:07:19,101 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 11:07:19,110 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) [2022-04-06 11:07:19,111 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-04-06 11:07:19,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 11:07:19,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 9 conjunts are in the unsatisfiable core [2022-04-06 11:07:19,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 11:07:19,382 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-04-06 11:07:19,382 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 11:07:19,382 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 11:07:19,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1155137631] [2022-04-06 11:07:19,382 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 11:07:19,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [150871279] [2022-04-06 11:07:19,382 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [150871279] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 11:07:19,383 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 11:07:19,383 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 11:07:19,383 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216767971] [2022-04-06 11:07:19,383 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 11:07:19,383 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 11:07:19,383 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 11:07:19,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 11:07:19,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-06 11:07:19,384 INFO L87 Difference]: Start difference. First operand 174 states and 243 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-06 11:07:20,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 11:07:20,255 INFO L93 Difference]: Finished difference Result 180 states and 247 transitions. [2022-04-06 11:07:20,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 11:07:20,256 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 31 [2022-04-06 11:07:20,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 11:07:20,258 INFO L225 Difference]: With dead ends: 180 [2022-04-06 11:07:20,258 INFO L226 Difference]: Without dead ends: 156 [2022-04-06 11:07:20,258 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-04-06 11:07:20,258 INFO L913 BasicCegarLoop]: 49 mSDtfsCounter, 6 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-04-06 11:07:20,259 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 154 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-04-06 11:07:20,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2022-04-06 11:07:20,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 156. [2022-04-06 11:07:20,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 86 states have (on average 1.2790697674418605) internal successors, (110), 93 states have internal predecessors, (110), 58 states have call successors, (58), 12 states have call predecessors, (58), 11 states have return successors, (51), 50 states have call predecessors, (51), 51 states have call successors, (51) [2022-04-06 11:07:20,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 219 transitions. [2022-04-06 11:07:20,277 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 219 transitions. Word has length 31 [2022-04-06 11:07:20,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 11:07:20,278 INFO L478 AbstractCegarLoop]: Abstraction has 156 states and 219 transitions. [2022-04-06 11:07:20,278 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-06 11:07:20,278 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 219 transitions. [2022-04-06 11:07:20,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-04-06 11:07:20,279 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 11:07:20,279 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 11:07:20,288 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-04-06 11:07:20,485 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 [2022-04-06 11:07:20,485 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 11:07:20,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 11:07:20,486 INFO L85 PathProgramCache]: Analyzing trace with hash -266035918, now seen corresponding path program 1 times [2022-04-06 11:07:20,486 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 11:07:20,486 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1424722652] [2022-04-06 11:07:20,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 11:07:20,486 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 11:07:20,494 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 11:07:20,495 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1261847494] [2022-04-06 11:07:20,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 11:07:20,495 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 11:07:20,495 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 11:07:20,496 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) [2022-04-06 11:07:20,503 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-04-06 11:07:20,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 11:07:20,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-06 11:07:20,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 11:07:20,715 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-04-06 11:07:20,716 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 11:07:20,716 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 11:07:20,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1424722652] [2022-04-06 11:07:20,716 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 11:07:20,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1261847494] [2022-04-06 11:07:20,716 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1261847494] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 11:07:20,716 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 11:07:20,716 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 11:07:20,717 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013009487] [2022-04-06 11:07:20,717 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 11:07:20,717 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 11:07:20,717 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 11:07:20,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 11:07:20,718 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-06 11:07:20,718 INFO L87 Difference]: Start difference. First operand 156 states and 219 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-06 11:07:22,932 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 11:07:25,264 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 11:07:25,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 11:07:25,296 INFO L93 Difference]: Finished difference Result 186 states and 244 transitions. [2022-04-06 11:07:25,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 11:07:25,297 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 34 [2022-04-06 11:07:25,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 11:07:25,298 INFO L225 Difference]: With dead ends: 186 [2022-04-06 11:07:25,298 INFO L226 Difference]: Without dead ends: 181 [2022-04-06 11:07:25,298 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-04-06 11:07:25,299 INFO L913 BasicCegarLoop]: 50 mSDtfsCounter, 8 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 2 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2022-04-06 11:07:25,299 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 156 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 44 Invalid, 2 Unknown, 0 Unchecked, 4.6s Time] [2022-04-06 11:07:25,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2022-04-06 11:07:25,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 174. [2022-04-06 11:07:25,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 100 states have (on average 1.16) internal successors, (116), 104 states have internal predecessors, (116), 55 states have call successors, (55), 19 states have call predecessors, (55), 18 states have return successors, (51), 50 states have call predecessors, (51), 51 states have call successors, (51) [2022-04-06 11:07:25,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 222 transitions. [2022-04-06 11:07:25,316 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 222 transitions. Word has length 34 [2022-04-06 11:07:25,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 11:07:25,317 INFO L478 AbstractCegarLoop]: Abstraction has 174 states and 222 transitions. [2022-04-06 11:07:25,317 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-06 11:07:25,317 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 222 transitions. [2022-04-06 11:07:25,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-04-06 11:07:25,318 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 11:07:25,318 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 11:07:25,326 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-04-06 11:07:25,524 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 [2022-04-06 11:07:25,524 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 11:07:25,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 11:07:25,525 INFO L85 PathProgramCache]: Analyzing trace with hash 1209382940, now seen corresponding path program 1 times [2022-04-06 11:07:25,525 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 11:07:25,525 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [888999269] [2022-04-06 11:07:25,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 11:07:25,526 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 11:07:25,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 11:07:25,637 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 11:07:25,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 11:07:25,644 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-06 11:07:25,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 11:07:25,649 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 11:07:25,649 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 11:07:25,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [888999269] [2022-04-06 11:07:25,649 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [888999269] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 11:07:25,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [594200982] [2022-04-06 11:07:25,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 11:07:25,650 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 11:07:25,650 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 11:07:25,651 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) [2022-04-06 11:07:25,670 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-04-06 11:07:25,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 11:07:25,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 13 conjunts are in the unsatisfiable core [2022-04-06 11:07:25,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 11:07:25,792 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 11:07:25,792 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 11:07:25,968 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 11:07:25,968 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [594200982] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 11:07:25,968 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 11:07:25,968 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 15 [2022-04-06 11:07:25,968 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126338633] [2022-04-06 11:07:25,968 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-06 11:07:25,969 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-04-06 11:07:25,969 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 11:07:25,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-04-06 11:07:25,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=137, Unknown=0, NotChecked=0, Total=210 [2022-04-06 11:07:25,970 INFO L87 Difference]: Start difference. First operand 174 states and 222 transitions. Second operand has 15 states, 15 states have (on average 3.2) internal successors, (48), 14 states have internal predecessors, (48), 4 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2022-04-06 11:07:29,031 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 11:07:31,178 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 11:07:34,053 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 11:07:36,565 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 11:07:38,569 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 11:07:40,574 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 11:07:43,076 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 11:07:45,117 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 11:07:49,194 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 11:07:51,198 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 11:07:55,860 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.85s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 11:07:57,867 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 11:08:00,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 11:08:00,893 INFO L93 Difference]: Finished difference Result 389 states and 501 transitions. [2022-04-06 11:08:00,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-04-06 11:08:00,894 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.2) internal successors, (48), 14 states have internal predecessors, (48), 4 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 32 [2022-04-06 11:08:00,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 11:08:00,896 INFO L225 Difference]: With dead ends: 389 [2022-04-06 11:08:00,896 INFO L226 Difference]: Without dead ends: 349 [2022-04-06 11:08:00,897 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 165 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=276, Invalid=716, Unknown=0, NotChecked=0, Total=992 [2022-04-06 11:08:00,898 INFO L913 BasicCegarLoop]: 47 mSDtfsCounter, 215 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 405 mSolverCounterSat, 140 mSolverCounterUnsat, 11 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 34.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 556 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 405 IncrementalHoareTripleChecker+Invalid, 11 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 34.6s IncrementalHoareTripleChecker+Time [2022-04-06 11:08:00,898 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [254 Valid, 156 Invalid, 556 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [140 Valid, 405 Invalid, 11 Unknown, 0 Unchecked, 34.6s Time] [2022-04-06 11:08:00,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states. [2022-04-06 11:08:00,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 317. [2022-04-06 11:08:00,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 317 states, 183 states have (on average 1.185792349726776) internal successors, (217), 190 states have internal predecessors, (217), 100 states have call successors, (100), 34 states have call predecessors, (100), 33 states have return successors, (93), 92 states have call predecessors, (93), 93 states have call successors, (93) [2022-04-06 11:08:00,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 410 transitions. [2022-04-06 11:08:00,927 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 410 transitions. Word has length 32 [2022-04-06 11:08:00,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 11:08:00,927 INFO L478 AbstractCegarLoop]: Abstraction has 317 states and 410 transitions. [2022-04-06 11:08:00,927 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 3.2) internal successors, (48), 14 states have internal predecessors, (48), 4 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2022-04-06 11:08:00,927 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 410 transitions. [2022-04-06 11:08:00,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-04-06 11:08:00,929 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 11:08:00,929 INFO L499 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 11:08:00,954 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-04-06 11:08:01,143 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-04-06 11:08:01,143 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 11:08:01,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 11:08:01,144 INFO L85 PathProgramCache]: Analyzing trace with hash -1556551492, now seen corresponding path program 2 times [2022-04-06 11:08:01,144 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 11:08:01,144 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [133502363] [2022-04-06 11:08:01,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 11:08:01,144 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 11:08:01,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 11:08:01,400 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 11:08:01,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 11:08:01,421 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-06 11:08:01,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 11:08:01,426 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 11:08:01,426 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 11:08:01,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [133502363] [2022-04-06 11:08:01,427 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [133502363] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 11:08:01,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2100461540] [2022-04-06 11:08:01,427 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 11:08:01,427 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 11:08:01,427 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 11:08:01,432 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) [2022-04-06 11:08:01,435 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-04-06 11:08:01,468 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-04-06 11:08:01,468 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 11:08:01,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 4 conjunts are in the unsatisfiable core [2022-04-06 11:08:01,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 11:08:01,600 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2022-04-06 11:08:01,600 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 11:08:01,600 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2100461540] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 11:08:01,600 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-04-06 11:08:01,600 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [15] total 18 [2022-04-06 11:08:01,601 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452618150] [2022-04-06 11:08:01,601 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 11:08:01,601 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 11:08:01,601 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-06 11:08:01,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 11:08:01,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=218, Unknown=0, NotChecked=0, Total=306 [2022-04-06 11:08:01,602 INFO L87 Difference]: Start difference. First operand 317 states and 410 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-06 11:08:01,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 11:08:01,659 INFO L93 Difference]: Finished difference Result 354 states and 459 transitions. [2022-04-06 11:08:01,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 11:08:01,660 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 50 [2022-04-06 11:08:01,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 11:08:01,662 INFO L225 Difference]: With dead ends: 354 [2022-04-06 11:08:01,662 INFO L226 Difference]: Without dead ends: 314 [2022-04-06 11:08:01,663 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2022-04-06 11:08:01,663 INFO L913 BasicCegarLoop]: 44 mSDtfsCounter, 0 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 11:08:01,664 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 167 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 11:08:01,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2022-04-06 11:08:01,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 183. [2022-04-06 11:08:01,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 107 states have (on average 1.1495327102803738) internal successors, (123), 110 states have internal predecessors, (123), 54 states have call successors, (54), 22 states have call predecessors, (54), 21 states have return successors, (50), 50 states have call predecessors, (50), 50 states have call successors, (50) [2022-04-06 11:08:01,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 227 transitions. [2022-04-06 11:08:01,683 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 227 transitions. Word has length 50 [2022-04-06 11:08:01,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 11:08:01,683 INFO L478 AbstractCegarLoop]: Abstraction has 183 states and 227 transitions. [2022-04-06 11:08:01,684 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-06 11:08:01,684 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 227 transitions. [2022-04-06 11:08:01,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-04-06 11:08:01,685 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 11:08:01,685 INFO L499 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 11:08:01,709 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-04-06 11:08:01,909 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 [2022-04-06 11:08:01,909 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 11:08:01,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 11:08:01,909 INFO L85 PathProgramCache]: Analyzing trace with hash -926681017, now seen corresponding path program 1 times [2022-04-06 11:08:01,910 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 11:08:01,910 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2090667337] [2022-04-06 11:08:01,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 11:08:01,910 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 11:08:01,918 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 11:08:01,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [121319492] [2022-04-06 11:08:01,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 11:08:01,919 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 11:08:01,919 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 11:08:01,923 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) [2022-04-06 11:08:01,930 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process