/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/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/hard-u_unwindbound100.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-d966a43 [2022-01-31 14:50:43,492 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-01-31 14:50:43,494 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-01-31 14:50:43,548 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-01-31 14:50:43,548 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-01-31 14:50:43,549 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-01-31 14:50:43,550 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-01-31 14:50:43,551 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-01-31 14:50:43,553 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-01-31 14:50:43,553 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-01-31 14:50:43,554 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-01-31 14:50:43,555 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-01-31 14:50:43,556 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-01-31 14:50:43,557 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-01-31 14:50:43,557 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-01-31 14:50:43,559 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-01-31 14:50:43,559 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-01-31 14:50:43,560 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-01-31 14:50:43,562 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-01-31 14:50:43,564 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-01-31 14:50:43,565 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-01-31 14:50:43,566 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-01-31 14:50:43,567 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-01-31 14:50:43,567 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-01-31 14:50:43,569 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2022-01-31 14:50:43,576 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-01-31 14:50:43,576 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-01-31 14:50:43,577 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-01-31 14:50:43,577 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-01-31 14:50:43,578 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-01-31 14:50:43,578 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-01-31 14:50:43,578 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-01-31 14:50:43,578 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-01-31 14:50:43,579 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-01-31 14:50:43,579 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-01-31 14:50:43,579 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-01-31 14:50:43,582 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2022-01-31 14:50:43,588 INFO L113 SettingsManager]: Loading preferences was successful [2022-01-31 14:50:43,588 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-01-31 14:50:43,589 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-01-31 14:50:43,589 INFO L138 SettingsManager]: * sizeof long=4 [2022-01-31 14:50:43,589 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-01-31 14:50:43,589 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-01-31 14:50:43,589 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-01-31 14:50:43,589 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-01-31 14:50:43,590 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-01-31 14:50:43,590 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-01-31 14:50:43,590 INFO L138 SettingsManager]: * sizeof long double=12 [2022-01-31 14:50:43,590 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-01-31 14:50:43,590 INFO L138 SettingsManager]: * Use constant arrays=true [2022-01-31 14:50:43,590 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-01-31 14:50:43,590 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-01-31 14:50:43,591 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-01-31 14:50:43,591 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-01-31 14:50:43,591 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-01-31 14:50:43,591 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-31 14:50:43,591 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-01-31 14:50:43,591 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-01-31 14:50:43,592 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2022-01-31 14:50:43,592 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-01-31 14:50:43,732 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-01-31 14:50:43,752 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-01-31 14:50:43,753 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-01-31 14:50:43,754 INFO L271 PluginConnector]: Initializing CDTParser... [2022-01-31 14:50:43,755 INFO L275 PluginConnector]: CDTParser initialized [2022-01-31 14:50:43,756 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/hard-u_unwindbound100.c [2022-01-31 14:50:43,801 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3830d3f8d/71814cc633c743f880cab88e7aa1a838/FLAG6e763f5c5 [2022-01-31 14:50:44,137 INFO L306 CDTParser]: Found 1 translation units. [2022-01-31 14:50:44,137 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard-u_unwindbound100.c [2022-01-31 14:50:44,141 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3830d3f8d/71814cc633c743f880cab88e7aa1a838/FLAG6e763f5c5 [2022-01-31 14:50:44,583 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3830d3f8d/71814cc633c743f880cab88e7aa1a838 [2022-01-31 14:50:44,585 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-01-31 14:50:44,586 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2022-01-31 14:50:44,588 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-01-31 14:50:44,588 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-01-31 14:50:44,590 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-01-31 14:50:44,590 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 02:50:44" (1/1) ... [2022-01-31 14:50:44,591 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ae3b0d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 02:50:44, skipping insertion in model container [2022-01-31 14:50:44,591 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 02:50:44" (1/1) ... [2022-01-31 14:50:44,597 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-01-31 14:50:44,606 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-01-31 14:50:44,696 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/hard-u_unwindbound100.c[537,550] [2022-01-31 14:50:44,730 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-31 14:50:44,735 INFO L203 MainTranslator]: Completed pre-run [2022-01-31 14:50:44,742 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/hard-u_unwindbound100.c[537,550] [2022-01-31 14:50:44,750 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-31 14:50:44,757 INFO L208 MainTranslator]: Completed translation [2022-01-31 14:50:44,757 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 02:50:44 WrapperNode [2022-01-31 14:50:44,758 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-01-31 14:50:44,758 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-01-31 14:50:44,758 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-01-31 14:50:44,758 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-01-31 14:50:44,766 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 02:50:44" (1/1) ... [2022-01-31 14:50:44,766 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 02:50:44" (1/1) ... [2022-01-31 14:50:44,771 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 02:50:44" (1/1) ... [2022-01-31 14:50:44,771 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 02:50:44" (1/1) ... [2022-01-31 14:50:44,774 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 02:50:44" (1/1) ... [2022-01-31 14:50:44,776 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 02:50:44" (1/1) ... [2022-01-31 14:50:44,777 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 02:50:44" (1/1) ... [2022-01-31 14:50:44,778 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-01-31 14:50:44,779 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-01-31 14:50:44,779 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-01-31 14:50:44,783 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-01-31 14:50:44,784 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 02:50:44" (1/1) ... [2022-01-31 14:50:44,795 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-31 14:50:44,804 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 14:50:44,814 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) [2022-01-31 14:50:44,815 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 [2022-01-31 14:50:44,836 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-01-31 14:50:44,836 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-01-31 14:50:44,836 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-01-31 14:50:44,836 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-01-31 14:50:44,836 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-01-31 14:50:44,836 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-01-31 14:50:44,837 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-01-31 14:50:44,837 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-01-31 14:50:44,837 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-01-31 14:50:44,837 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-01-31 14:50:44,837 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-01-31 14:50:44,837 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-01-31 14:50:44,837 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-01-31 14:50:44,837 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-01-31 14:50:44,837 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-01-31 14:50:44,837 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-01-31 14:50:44,838 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-01-31 14:50:44,838 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-01-31 14:50:44,838 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-01-31 14:50:44,838 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-01-31 14:50:44,890 INFO L234 CfgBuilder]: Building ICFG [2022-01-31 14:50:44,891 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-01-31 14:50:44,979 INFO L275 CfgBuilder]: Performing block encoding [2022-01-31 14:50:44,983 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-01-31 14:50:44,983 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-01-31 14:50:44,984 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 02:50:44 BoogieIcfgContainer [2022-01-31 14:50:44,985 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-01-31 14:50:44,985 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2022-01-31 14:50:44,985 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2022-01-31 14:50:44,986 INFO L275 PluginConnector]: IcfgTransformer initialized [2022-01-31 14:50:44,988 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 02:50:44" (1/1) ... [2022-01-31 14:50:45,001 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 31.01 02:50:45 BasicIcfg [2022-01-31 14:50:45,001 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2022-01-31 14:50:45,003 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-01-31 14:50:45,003 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-01-31 14:50:45,005 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-01-31 14:50:45,005 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.01 02:50:44" (1/4) ... [2022-01-31 14:50:45,005 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f53d688 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 02:50:45, skipping insertion in model container [2022-01-31 14:50:45,005 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 02:50:44" (2/4) ... [2022-01-31 14:50:45,006 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f53d688 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 02:50:45, skipping insertion in model container [2022-01-31 14:50:45,006 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 02:50:44" (3/4) ... [2022-01-31 14:50:45,006 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f53d688 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 31.01 02:50:45, skipping insertion in model container [2022-01-31 14:50:45,006 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 31.01 02:50:45" (4/4) ... [2022-01-31 14:50:45,007 INFO L111 eAbstractionObserver]: Analyzing ICFG hard-u_unwindbound100.cJordan [2022-01-31 14:50:45,010 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2022-01-31 14:50:45,010 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-01-31 14:50:45,036 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-01-31 14:50:45,041 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=ForwardPredicates, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2022-01-31 14:50:45,041 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-01-31 14:50:45,050 INFO L276 IsEmpty]: Start isEmpty. Operand has 37 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-01-31 14:50:45,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-01-31 14:50:45,056 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 14:50:45,056 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 14:50:45,057 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 14:50:45,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 14:50:45,060 INFO L85 PathProgramCache]: Analyzing trace with hash 79654685, now seen corresponding path program 1 times [2022-01-31 14:50:45,092 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 14:50:45,093 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1444907953] [2022-01-31 14:50:45,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 14:50:45,094 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 14:50:45,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 14:50:45,274 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 14:50:45,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 14:50:45,290 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 14:50:45,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 14:50:45,296 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 14:50:45,297 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 14:50:45,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1444907953] [2022-01-31 14:50:45,297 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1444907953] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 14:50:45,298 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 14:50:45,298 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-01-31 14:50:45,299 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [110065242] [2022-01-31 14:50:45,299 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 14:50:45,302 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-01-31 14:50:45,302 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 14:50:45,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-01-31 14:50:45,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-01-31 14:50:45,320 INFO L87 Difference]: Start difference. First operand has 37 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) 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) [2022-01-31 14:50:45,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 14:50:45,418 INFO L93 Difference]: Finished difference Result 38 states and 48 transitions. [2022-01-31 14:50:45,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-01-31 14:50:45,421 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 [2022-01-31 14:50:45,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 14:50:45,428 INFO L225 Difference]: With dead ends: 38 [2022-01-31 14:50:45,429 INFO L226 Difference]: Without dead ends: 33 [2022-01-31 14:50:45,430 INFO L932 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 [2022-01-31 14:50:45,438 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 10 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 14:50:45,438 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 49 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 14:50:45,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-01-31 14:50:45,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2022-01-31 14:50:45,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 14:50:45,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2022-01-31 14:50:45,481 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 18 [2022-01-31 14:50:45,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 14:50:45,482 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2022-01-31 14:50:45,482 INFO L471 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) [2022-01-31 14:50:45,482 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2022-01-31 14:50:45,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-01-31 14:50:45,483 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 14:50:45,483 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 14:50:45,483 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-01-31 14:50:45,484 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 14:50:45,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 14:50:45,486 INFO L85 PathProgramCache]: Analyzing trace with hash -85369733, now seen corresponding path program 1 times [2022-01-31 14:50:45,486 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 14:50:45,486 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1784703774] [2022-01-31 14:50:45,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 14:50:45,486 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 14:50:45,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 14:50:45,568 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 14:50:45,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 14:50:45,577 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 14:50:45,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 14:50:45,582 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 14:50:45,582 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 14:50:45,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1784703774] [2022-01-31 14:50:45,582 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1784703774] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 14:50:45,582 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 14:50:45,583 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-01-31 14:50:45,583 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142949205] [2022-01-31 14:50:45,583 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 14:50:45,584 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-01-31 14:50:45,584 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 14:50:45,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-01-31 14:50:45,585 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-01-31 14:50:45,585 INFO L87 Difference]: Start difference. First operand 32 states and 42 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 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) [2022-01-31 14:50:45,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 14:50:45,743 INFO L93 Difference]: Finished difference Result 45 states and 60 transitions. [2022-01-31 14:50:45,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-01-31 14:50:45,744 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 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 18 [2022-01-31 14:50:45,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 14:50:45,746 INFO L225 Difference]: With dead ends: 45 [2022-01-31 14:50:45,746 INFO L226 Difference]: Without dead ends: 45 [2022-01-31 14:50:45,750 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-01-31 14:50:45,751 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 28 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 14:50:45,751 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 96 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 14:50:45,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-01-31 14:50:45,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 36. [2022-01-31 14:50:45,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 22 states have internal predecessors, (27), 10 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 14:50:45,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 45 transitions. [2022-01-31 14:50:45,768 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 45 transitions. Word has length 18 [2022-01-31 14:50:45,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 14:50:45,771 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 45 transitions. [2022-01-31 14:50:45,771 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 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) [2022-01-31 14:50:45,774 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 45 transitions. [2022-01-31 14:50:45,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-01-31 14:50:45,774 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 14:50:45,774 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 14:50:45,774 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-01-31 14:50:45,775 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 14:50:45,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 14:50:45,775 INFO L85 PathProgramCache]: Analyzing trace with hash -1527809342, now seen corresponding path program 1 times [2022-01-31 14:50:45,775 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 14:50:45,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1644959057] [2022-01-31 14:50:45,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 14:50:45,776 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 14:50:45,786 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-01-31 14:50:45,787 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1322697793] [2022-01-31 14:50:45,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 14:50:45,787 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 14:50:45,787 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 14:50:45,792 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) [2022-01-31 14:50:45,793 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-01-31 14:50:45,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 14:50:45,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 5 conjunts are in the unsatisfiable core [2022-01-31 14:50:45,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-31 14:50:45,944 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 14:50:45,944 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-01-31 14:50:45,944 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 14:50:45,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1644959057] [2022-01-31 14:50:45,944 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-01-31 14:50:45,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1322697793] [2022-01-31 14:50:45,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1322697793] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 14:50:45,946 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 14:50:45,946 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-01-31 14:50:45,948 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718886910] [2022-01-31 14:50:45,948 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 14:50:45,949 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-01-31 14:50:45,949 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 14:50:45,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-01-31 14:50:45,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-01-31 14:50:45,949 INFO L87 Difference]: Start difference. First operand 36 states and 45 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) [2022-01-31 14:50:45,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 14:50:45,959 INFO L93 Difference]: Finished difference Result 38 states and 47 transitions. [2022-01-31 14:50:45,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-01-31 14:50:45,960 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 [2022-01-31 14:50:45,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 14:50:45,960 INFO L225 Difference]: With dead ends: 38 [2022-01-31 14:50:45,961 INFO L226 Difference]: Without dead ends: 38 [2022-01-31 14:50:45,961 INFO L932 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 [2022-01-31 14:50:45,961 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 0 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 107 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 [2022-01-31 14:50:45,962 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 107 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 14:50:45,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-01-31 14:50:45,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-01-31 14:50:45,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 24 states have internal predecessors, (29), 10 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 14:50:45,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 47 transitions. [2022-01-31 14:50:45,965 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 47 transitions. Word has length 20 [2022-01-31 14:50:45,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 14:50:45,965 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 47 transitions. [2022-01-31 14:50:45,965 INFO L471 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) [2022-01-31 14:50:45,965 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 47 transitions. [2022-01-31 14:50:45,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-01-31 14:50:45,966 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 14:50:45,966 INFO L514 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] [2022-01-31 14:50:45,986 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-01-31 14:50:46,179 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 14:50:46,180 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 14:50:46,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 14:50:46,180 INFO L85 PathProgramCache]: Analyzing trace with hash 2128444854, now seen corresponding path program 1 times [2022-01-31 14:50:46,180 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 14:50:46,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [214671541] [2022-01-31 14:50:46,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 14:50:46,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 14:50:46,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 14:50:46,243 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 14:50:46,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 14:50:46,248 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 14:50:46,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 14:50:46,251 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2022-01-31 14:50:46,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 14:50:46,265 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 14:50:46,265 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 14:50:46,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [214671541] [2022-01-31 14:50:46,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [214671541] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 14:50:46,266 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 14:50:46,266 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-01-31 14:50:46,266 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083229579] [2022-01-31 14:50:46,266 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 14:50:46,266 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-01-31 14:50:46,266 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 14:50:46,266 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-01-31 14:50:46,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-01-31 14:50:46,267 INFO L87 Difference]: Start difference. First operand 38 states and 47 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-01-31 14:50:46,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 14:50:46,399 INFO L93 Difference]: Finished difference Result 50 states and 64 transitions. [2022-01-31 14:50:46,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-01-31 14:50:46,399 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2022-01-31 14:50:46,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 14:50:46,400 INFO L225 Difference]: With dead ends: 50 [2022-01-31 14:50:46,400 INFO L226 Difference]: Without dead ends: 50 [2022-01-31 14:50:46,400 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-01-31 14:50:46,401 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 23 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 14:50:46,401 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 89 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 14:50:46,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-01-31 14:50:46,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 42. [2022-01-31 14:50:46,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 10 states have call successors, (10), 6 states have call predecessors, (10), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 14:50:46,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2022-01-31 14:50:46,404 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 23 [2022-01-31 14:50:46,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 14:50:46,404 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2022-01-31 14:50:46,405 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-01-31 14:50:46,405 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2022-01-31 14:50:46,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-01-31 14:50:46,405 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 14:50:46,405 INFO L514 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] [2022-01-31 14:50:46,405 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-01-31 14:50:46,405 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 14:50:46,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 14:50:46,406 INFO L85 PathProgramCache]: Analyzing trace with hash 135546551, now seen corresponding path program 1 times [2022-01-31 14:50:46,406 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 14:50:46,406 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1420262775] [2022-01-31 14:50:46,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 14:50:46,406 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 14:50:46,414 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-01-31 14:50:46,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [866487203] [2022-01-31 14:50:46,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 14:50:46,414 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 14:50:46,414 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 14:50:46,415 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) [2022-01-31 14:50:46,416 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-01-31 14:50:46,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 14:50:46,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 7 conjunts are in the unsatisfiable core [2022-01-31 14:50:46,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-31 14:50:46,537 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-01-31 14:50:46,538 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-01-31 14:50:46,538 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 14:50:46,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1420262775] [2022-01-31 14:50:46,538 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-01-31 14:50:46,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [866487203] [2022-01-31 14:50:46,539 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [866487203] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 14:50:46,539 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 14:50:46,539 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-01-31 14:50:46,539 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285510325] [2022-01-31 14:50:46,539 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 14:50:46,540 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-01-31 14:50:46,540 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 14:50:46,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-01-31 14:50:46,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-01-31 14:50:46,541 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 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) [2022-01-31 14:50:48,579 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 [] [2022-01-31 14:50:48,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 14:50:48,741 INFO L93 Difference]: Finished difference Result 57 states and 73 transitions. [2022-01-31 14:50:48,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-01-31 14:50:48,743 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), 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 28 [2022-01-31 14:50:48,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 14:50:48,744 INFO L225 Difference]: With dead ends: 57 [2022-01-31 14:50:48,744 INFO L226 Difference]: Without dead ends: 56 [2022-01-31 14:50:48,744 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-01-31 14:50:48,744 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 10 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-01-31 14:50:48,745 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 151 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 36 Invalid, 1 Unknown, 0 Unchecked, 2.2s Time] [2022-01-31 14:50:48,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-01-31 14:50:48,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2022-01-31 14:50:48,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 33 states have (on average 1.2727272727272727) internal successors, (42), 35 states have internal predecessors, (42), 16 states have call successors, (16), 7 states have call predecessors, (16), 6 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-01-31 14:50:48,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 71 transitions. [2022-01-31 14:50:48,749 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 71 transitions. Word has length 28 [2022-01-31 14:50:48,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 14:50:48,749 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 71 transitions. [2022-01-31 14:50:48,749 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 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) [2022-01-31 14:50:48,749 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 71 transitions. [2022-01-31 14:50:48,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-01-31 14:50:48,750 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 14:50:48,750 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 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] [2022-01-31 14:50:48,789 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-01-31 14:50:48,959 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 14:50:48,959 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 14:50:48,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 14:50:48,960 INFO L85 PathProgramCache]: Analyzing trace with hash 1016025214, now seen corresponding path program 1 times [2022-01-31 14:50:48,960 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 14:50:48,960 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [793263141] [2022-01-31 14:50:48,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 14:50:48,960 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 14:50:48,969 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-01-31 14:50:48,969 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1242117153] [2022-01-31 14:50:48,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 14:50:48,969 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 14:50:48,969 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 14:50:48,970 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) [2022-01-31 14:50:48,975 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-01-31 14:50:49,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 14:50:49,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 7 conjunts are in the unsatisfiable core [2022-01-31 14:50:49,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-31 14:50:49,147 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-01-31 14:50:49,147 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-01-31 14:50:49,148 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 14:50:49,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [793263141] [2022-01-31 14:50:49,148 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-01-31 14:50:49,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1242117153] [2022-01-31 14:50:49,148 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1242117153] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 14:50:49,148 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 14:50:49,148 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-01-31 14:50:49,148 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733128909] [2022-01-31 14:50:49,148 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 14:50:49,149 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-01-31 14:50:49,149 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 14:50:49,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-01-31 14:50:49,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-01-31 14:50:49,149 INFO L87 Difference]: Start difference. First operand 56 states and 71 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2022-01-31 14:50:49,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 14:50:49,183 INFO L93 Difference]: Finished difference Result 69 states and 80 transitions. [2022-01-31 14:50:49,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-01-31 14:50:49,184 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), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 36 [2022-01-31 14:50:49,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 14:50:49,185 INFO L225 Difference]: With dead ends: 69 [2022-01-31 14:50:49,185 INFO L226 Difference]: Without dead ends: 69 [2022-01-31 14:50:49,185 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-01-31 14:50:49,186 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 7 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 14:50:49,186 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 117 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 14:50:49,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-01-31 14:50:49,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2022-01-31 14:50:49,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 42 states have (on average 1.1904761904761905) internal successors, (50), 44 states have internal predecessors, (50), 16 states have call successors, (16), 10 states have call predecessors, (16), 9 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-01-31 14:50:49,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 79 transitions. [2022-01-31 14:50:49,190 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 79 transitions. Word has length 36 [2022-01-31 14:50:49,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 14:50:49,190 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 79 transitions. [2022-01-31 14:50:49,191 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2022-01-31 14:50:49,191 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 79 transitions. [2022-01-31 14:50:49,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-01-31 14:50:49,191 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 14:50:49,191 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 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] [2022-01-31 14:50:49,213 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-01-31 14:50:49,409 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 14:50:49,409 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 14:50:49,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 14:50:49,410 INFO L85 PathProgramCache]: Analyzing trace with hash 1017127481, now seen corresponding path program 1 times [2022-01-31 14:50:49,410 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 14:50:49,410 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [694624890] [2022-01-31 14:50:49,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 14:50:49,410 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 14:50:49,420 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-01-31 14:50:49,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1278852193] [2022-01-31 14:50:49,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 14:50:49,420 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 14:50:49,420 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 14:50:49,421 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) [2022-01-31 14:50:49,425 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-01-31 14:50:49,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 14:50:49,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 10 conjunts are in the unsatisfiable core [2022-01-31 14:50:49,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-31 14:50:49,647 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-01-31 14:50:49,648 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-01-31 14:50:49,648 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 14:50:49,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [694624890] [2022-01-31 14:50:49,648 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-01-31 14:50:49,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1278852193] [2022-01-31 14:50:49,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1278852193] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 14:50:49,649 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 14:50:49,649 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-01-31 14:50:49,652 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152734503] [2022-01-31 14:50:49,652 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 14:50:49,652 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-01-31 14:50:49,653 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 14:50:49,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-01-31 14:50:49,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-01-31 14:50:49,653 INFO L87 Difference]: Start difference. First operand 68 states and 79 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-01-31 14:50:54,853 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 5.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-01-31 14:50:54,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 14:50:54,919 INFO L93 Difference]: Finished difference Result 80 states and 96 transitions. [2022-01-31 14:50:54,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-01-31 14:50:54,919 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 36 [2022-01-31 14:50:54,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 14:50:54,920 INFO L225 Difference]: With dead ends: 80 [2022-01-31 14:50:54,920 INFO L226 Difference]: Without dead ends: 79 [2022-01-31 14:50:54,920 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-01-31 14:50:54,921 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 14 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 9 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2022-01-31 14:50:54,921 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 189 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 67 Invalid, 1 Unknown, 0 Unchecked, 5.2s Time] [2022-01-31 14:50:54,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-01-31 14:50:54,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2022-01-31 14:50:54,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 49 states have (on average 1.2040816326530612) internal successors, (59), 51 states have internal predecessors, (59), 18 states have call successors, (18), 11 states have call predecessors, (18), 10 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2022-01-31 14:50:54,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 93 transitions. [2022-01-31 14:50:54,926 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 93 transitions. Word has length 36 [2022-01-31 14:50:54,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 14:50:54,926 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 93 transitions. [2022-01-31 14:50:54,926 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-01-31 14:50:54,926 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 93 transitions. [2022-01-31 14:50:54,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-01-31 14:50:54,927 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 14:50:54,927 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 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] [2022-01-31 14:50:54,945 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-01-31 14:50:55,127 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 14:50:55,128 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 14:50:55,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 14:50:55,128 INFO L85 PathProgramCache]: Analyzing trace with hash 1880362404, now seen corresponding path program 1 times [2022-01-31 14:50:55,128 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 14:50:55,128 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [789157141] [2022-01-31 14:50:55,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 14:50:55,129 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 14:50:55,136 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-01-31 14:50:55,136 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1399572306] [2022-01-31 14:50:55,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 14:50:55,137 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 14:50:55,137 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 14:50:55,140 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) [2022-01-31 14:50:55,145 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-01-31 14:50:55,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 14:50:55,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 7 conjunts are in the unsatisfiable core [2022-01-31 14:50:55,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-31 14:50:55,294 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-01-31 14:50:55,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-31 14:50:55,400 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-01-31 14:50:55,400 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 14:50:55,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [789157141] [2022-01-31 14:50:55,400 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-01-31 14:50:55,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1399572306] [2022-01-31 14:50:55,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1399572306] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-31 14:50:55,400 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-01-31 14:50:55,400 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2022-01-31 14:50:55,401 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [475537453] [2022-01-31 14:50:55,401 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-01-31 14:50:55,401 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-01-31 14:50:55,401 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 14:50:55,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-01-31 14:50:55,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-01-31 14:50:55,402 INFO L87 Difference]: Start difference. First operand 78 states and 93 transitions. Second operand has 8 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 6 states have call successors, (12), 5 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 5 states have call successors, (10) [2022-01-31 14:50:55,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 14:50:55,530 INFO L93 Difference]: Finished difference Result 146 states and 174 transitions. [2022-01-31 14:50:55,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-01-31 14:50:55,530 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 6 states have call successors, (12), 5 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 5 states have call successors, (10) Word has length 38 [2022-01-31 14:50:55,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 14:50:55,532 INFO L225 Difference]: With dead ends: 146 [2022-01-31 14:50:55,532 INFO L226 Difference]: Without dead ends: 146 [2022-01-31 14:50:55,532 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2022-01-31 14:50:55,533 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 54 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 248 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 14:50:55,533 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 248 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 14:50:55,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2022-01-31 14:50:55,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 138. [2022-01-31 14:50:55,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 88 states have (on average 1.2159090909090908) internal successors, (107), 92 states have internal predecessors, (107), 31 states have call successors, (31), 19 states have call predecessors, (31), 18 states have return successors, (28), 26 states have call predecessors, (28), 28 states have call successors, (28) [2022-01-31 14:50:55,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 166 transitions. [2022-01-31 14:50:55,546 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 166 transitions. Word has length 38 [2022-01-31 14:50:55,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 14:50:55,546 INFO L470 AbstractCegarLoop]: Abstraction has 138 states and 166 transitions. [2022-01-31 14:50:55,547 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 6 states have call successors, (12), 5 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 5 states have call successors, (10) [2022-01-31 14:50:55,547 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 166 transitions. [2022-01-31 14:50:55,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-01-31 14:50:55,547 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 14:50:55,548 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 14:50:55,566 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-01-31 14:50:55,748 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 14:50:55,748 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 14:50:55,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 14:50:55,749 INFO L85 PathProgramCache]: Analyzing trace with hash 1525733273, now seen corresponding path program 1 times [2022-01-31 14:50:55,749 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 14:50:55,749 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [721660238] [2022-01-31 14:50:55,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 14:50:55,749 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 14:50:55,757 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-01-31 14:50:55,757 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [231222637] [2022-01-31 14:50:55,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 14:50:55,757 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 14:50:55,757 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 14:50:55,758 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) [2022-01-31 14:50:55,761 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-01-31 14:50:55,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 14:50:55,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 16 conjunts are in the unsatisfiable core [2022-01-31 14:50:55,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-31 14:50:56,103 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-01-31 14:50:56,103 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-31 14:50:56,345 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-01-31 14:50:56,345 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 14:50:56,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [721660238] [2022-01-31 14:50:56,345 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-01-31 14:50:56,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [231222637] [2022-01-31 14:50:56,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [231222637] provided 1 perfect and 1 imperfect interpolant sequences [2022-01-31 14:50:56,346 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-01-31 14:50:56,346 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9] total 11 [2022-01-31 14:50:56,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510061707] [2022-01-31 14:50:56,346 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 14:50:56,346 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-01-31 14:50:56,346 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 14:50:56,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-01-31 14:50:56,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-01-31 14:50:56,347 INFO L87 Difference]: Start difference. First operand 138 states and 166 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-01-31 14:50:58,377 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 [] [2022-01-31 14:51:00,542 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-01-31 14:51:02,685 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-01-31 14:51:03,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 14:51:03,376 INFO L93 Difference]: Finished difference Result 160 states and 195 transitions. [2022-01-31 14:51:03,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-01-31 14:51:03,377 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 46 [2022-01-31 14:51:03,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 14:51:03,378 INFO L225 Difference]: With dead ends: 160 [2022-01-31 14:51:03,378 INFO L226 Difference]: Without dead ends: 160 [2022-01-31 14:51:03,378 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2022-01-31 14:51:03,378 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 17 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 5 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.0s IncrementalHoareTripleChecker+Time [2022-01-31 14:51:03,379 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 145 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 37 Invalid, 3 Unknown, 0 Unchecked, 7.0s Time] [2022-01-31 14:51:03,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2022-01-31 14:51:03,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 154. [2022-01-31 14:51:03,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 98 states have (on average 1.2040816326530612) internal successors, (118), 104 states have internal predecessors, (118), 35 states have call successors, (35), 21 states have call predecessors, (35), 20 states have return successors, (32), 28 states have call predecessors, (32), 32 states have call successors, (32) [2022-01-31 14:51:03,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 185 transitions. [2022-01-31 14:51:03,388 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 185 transitions. Word has length 46 [2022-01-31 14:51:03,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 14:51:03,388 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 185 transitions. [2022-01-31 14:51:03,388 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-01-31 14:51:03,388 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 185 transitions. [2022-01-31 14:51:03,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-01-31 14:51:03,389 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 14:51:03,389 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 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, 1, 1, 1] [2022-01-31 14:51:03,403 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-01-31 14:51:03,597 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 14:51:03,598 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 14:51:03,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 14:51:03,598 INFO L85 PathProgramCache]: Analyzing trace with hash 450187565, now seen corresponding path program 1 times [2022-01-31 14:51:03,598 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 14:51:03,598 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1390766905] [2022-01-31 14:51:03,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 14:51:03,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 14:51:03,615 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-01-31 14:51:03,615 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1707367501] [2022-01-31 14:51:03,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 14:51:03,615 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 14:51:03,615 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 14:51:03,617 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) [2022-01-31 14:51:03,618 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-01-31 14:51:03,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 14:51:03,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 9 conjunts are in the unsatisfiable core [2022-01-31 14:51:03,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-31 14:51:03,793 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-01-31 14:51:03,794 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-31 14:51:03,969 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-01-31 14:51:03,969 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 14:51:03,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1390766905] [2022-01-31 14:51:03,970 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-01-31 14:51:03,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1707367501] [2022-01-31 14:51:03,970 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1707367501] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-31 14:51:03,970 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-01-31 14:51:03,970 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2022-01-31 14:51:03,972 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975085928] [2022-01-31 14:51:03,972 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-01-31 14:51:03,972 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-01-31 14:51:03,972 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 14:51:03,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-01-31 14:51:03,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-01-31 14:51:03,973 INFO L87 Difference]: Start difference. First operand 154 states and 185 transitions. Second operand has 10 states, 10 states have (on average 4.4) internal successors, (44), 10 states have internal predecessors, (44), 8 states have call successors, (16), 6 states have call predecessors, (16), 5 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) [2022-01-31 14:51:04,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 14:51:04,294 INFO L93 Difference]: Finished difference Result 257 states and 309 transitions. [2022-01-31 14:51:04,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-01-31 14:51:04,297 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.4) internal successors, (44), 10 states have internal predecessors, (44), 8 states have call successors, (16), 6 states have call predecessors, (16), 5 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) Word has length 50 [2022-01-31 14:51:04,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 14:51:04,298 INFO L225 Difference]: With dead ends: 257 [2022-01-31 14:51:04,298 INFO L226 Difference]: Without dead ends: 257 [2022-01-31 14:51:04,298 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2022-01-31 14:51:04,299 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 102 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 14:51:04,299 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [102 Valid, 250 Invalid, 150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 14:51:04,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2022-01-31 14:51:04,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 250. [2022-01-31 14:51:04,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 250 states, 160 states have (on average 1.2) internal successors, (192), 172 states have internal predecessors, (192), 59 states have call successors, (59), 31 states have call predecessors, (59), 30 states have return successors, (54), 46 states have call predecessors, (54), 54 states have call successors, (54) [2022-01-31 14:51:04,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 305 transitions. [2022-01-31 14:51:04,331 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 305 transitions. Word has length 50 [2022-01-31 14:51:04,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 14:51:04,332 INFO L470 AbstractCegarLoop]: Abstraction has 250 states and 305 transitions. [2022-01-31 14:51:04,332 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 4.4) internal successors, (44), 10 states have internal predecessors, (44), 8 states have call successors, (16), 6 states have call predecessors, (16), 5 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) [2022-01-31 14:51:04,332 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 305 transitions. [2022-01-31 14:51:04,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-01-31 14:51:04,333 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 14:51:04,333 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 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] [2022-01-31 14:51:04,353 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-01-31 14:51:04,533 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 14:51:04,533 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 14:51:04,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 14:51:04,534 INFO L85 PathProgramCache]: Analyzing trace with hash 451289832, now seen corresponding path program 1 times [2022-01-31 14:51:04,534 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 14:51:04,534 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [119972473] [2022-01-31 14:51:04,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 14:51:04,535 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 14:51:04,548 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-01-31 14:51:04,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1050338710] [2022-01-31 14:51:04,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 14:51:04,548 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 14:51:04,548 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 14:51:04,556 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) [2022-01-31 14:51:04,557 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process