/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/loopacceleration/qvasr/qvasr_64.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_3-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-05ce600 [2022-02-23 20:43:46,549 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-02-23 20:43:46,550 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-02-23 20:43:46,587 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-02-23 20:43:46,588 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-02-23 20:43:46,588 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-02-23 20:43:46,589 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-02-23 20:43:46,590 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-02-23 20:43:46,591 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-02-23 20:43:46,592 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-02-23 20:43:46,592 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-02-23 20:43:46,593 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-02-23 20:43:46,593 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-02-23 20:43:46,597 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-02-23 20:43:46,598 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-02-23 20:43:46,612 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-02-23 20:43:46,612 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-02-23 20:43:46,613 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-02-23 20:43:46,614 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-02-23 20:43:46,615 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-02-23 20:43:46,616 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-02-23 20:43:46,617 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-02-23 20:43:46,617 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-02-23 20:43:46,618 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-02-23 20:43:46,619 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2022-02-23 20:43:46,624 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-02-23 20:43:46,625 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-02-23 20:43:46,625 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-02-23 20:43:46,632 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/loopacceleration/qvasr/qvasr_64.epf [2022-02-23 20:43:46,652 INFO L113 SettingsManager]: Loading preferences was successful [2022-02-23 20:43:46,653 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-02-23 20:43:46,653 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-02-23 20:43:46,653 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-02-23 20:43:46,654 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-02-23 20:43:46,654 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-02-23 20:43:46,654 INFO L138 SettingsManager]: * Use SBE=true [2022-02-23 20:43:46,654 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-02-23 20:43:46,654 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-02-23 20:43:46,654 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-02-23 20:43:46,655 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-02-23 20:43:46,655 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-02-23 20:43:46,655 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-02-23 20:43:46,655 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-02-23 20:43:46,659 INFO L138 SettingsManager]: * Use constant arrays=true [2022-02-23 20:43:46,659 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-02-23 20:43:46,659 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-02-23 20:43:46,659 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-02-23 20:43:46,659 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-02-23 20:43:46,659 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-02-23 20:43:46,659 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-02-23 20:43:46,659 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-02-23 20:43:46,660 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-02-23 20:43:46,660 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-02-23 20:43:46,660 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-02-23 20:43:46,660 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-02-23 20:43:46,660 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-02-23 20:43:46,660 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-02-23 20:43:46,661 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2022-02-23 20:43:46,661 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_QVASR WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-02-23 20:43:46,854 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-02-23 20:43:46,871 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-02-23 20:43:46,872 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-02-23 20:43:46,873 INFO L271 PluginConnector]: Initializing CDTParser... [2022-02-23 20:43:46,875 INFO L275 PluginConnector]: CDTParser initialized [2022-02-23 20:43:46,876 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_3-2.i [2022-02-23 20:43:46,938 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a54254903/2ac5de79a4eb4cb2bab78f90f82ae6f4/FLAGe7fa2aa22 [2022-02-23 20:43:47,296 INFO L306 CDTParser]: Found 1 translation units. [2022-02-23 20:43:47,297 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_3-2.i [2022-02-23 20:43:47,303 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a54254903/2ac5de79a4eb4cb2bab78f90f82ae6f4/FLAGe7fa2aa22 [2022-02-23 20:43:47,313 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a54254903/2ac5de79a4eb4cb2bab78f90f82ae6f4 [2022-02-23 20:43:47,315 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-02-23 20:43:47,315 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2022-02-23 20:43:47,320 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-02-23 20:43:47,320 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-02-23 20:43:47,323 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-02-23 20:43:47,323 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.02 08:43:47" (1/1) ... [2022-02-23 20:43:47,324 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@545327d7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 08:43:47, skipping insertion in model container [2022-02-23 20:43:47,324 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.02 08:43:47" (1/1) ... [2022-02-23 20:43:47,328 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-02-23 20:43:47,336 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-02-23 20:43:47,437 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_3-2.i[809,822] [2022-02-23 20:43:47,487 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-02-23 20:43:47,492 INFO L203 MainTranslator]: Completed pre-run [2022-02-23 20:43:47,504 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_3-2.i[809,822] [2022-02-23 20:43:47,511 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-02-23 20:43:47,523 INFO L208 MainTranslator]: Completed translation [2022-02-23 20:43:47,523 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 08:43:47 WrapperNode [2022-02-23 20:43:47,523 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-02-23 20:43:47,525 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-02-23 20:43:47,525 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-02-23 20:43:47,526 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-02-23 20:43:47,533 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 08:43:47" (1/1) ... [2022-02-23 20:43:47,534 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 08:43:47" (1/1) ... [2022-02-23 20:43:47,539 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 08:43:47" (1/1) ... [2022-02-23 20:43:47,539 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 08:43:47" (1/1) ... [2022-02-23 20:43:47,552 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 08:43:47" (1/1) ... [2022-02-23 20:43:47,556 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 08:43:47" (1/1) ... [2022-02-23 20:43:47,557 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 08:43:47" (1/1) ... [2022-02-23 20:43:47,563 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-02-23 20:43:47,564 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-02-23 20:43:47,564 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-02-23 20:43:47,564 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-02-23 20:43:47,566 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 08:43:47" (1/1) ... [2022-02-23 20:43:47,571 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-02-23 20:43:47,578 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-23 20:43:47,590 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) [2022-02-23 20:43:47,607 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 [2022-02-23 20:43:47,620 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-02-23 20:43:47,621 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-02-23 20:43:47,621 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-02-23 20:43:47,621 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-02-23 20:43:47,621 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-02-23 20:43:47,621 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-02-23 20:43:47,621 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-02-23 20:43:47,621 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2022-02-23 20:43:47,622 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2022-02-23 20:43:47,623 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-02-23 20:43:47,623 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-02-23 20:43:47,623 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-02-23 20:43:47,623 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-02-23 20:43:47,623 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-02-23 20:43:47,623 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-02-23 20:43:47,623 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-02-23 20:43:47,623 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-02-23 20:43:47,623 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-02-23 20:43:47,623 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-02-23 20:43:47,623 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-02-23 20:43:47,623 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-02-23 20:43:47,669 INFO L234 CfgBuilder]: Building ICFG [2022-02-23 20:43:47,671 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-02-23 20:43:47,754 INFO L275 CfgBuilder]: Performing block encoding [2022-02-23 20:43:47,758 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-02-23 20:43:47,758 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-02-23 20:43:47,759 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.02 08:43:47 BoogieIcfgContainer [2022-02-23 20:43:47,759 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-02-23 20:43:47,760 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2022-02-23 20:43:47,760 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2022-02-23 20:43:47,761 INFO L275 PluginConnector]: IcfgTransformer initialized [2022-02-23 20:43:47,763 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.02 08:43:47" (1/1) ... [2022-02-23 20:43:47,775 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 23.02 08:43:47 BasicIcfg [2022-02-23 20:43:47,775 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2022-02-23 20:43:47,776 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-02-23 20:43:47,776 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-02-23 20:43:47,778 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-02-23 20:43:47,778 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.02 08:43:47" (1/4) ... [2022-02-23 20:43:47,779 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52be7fac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.02 08:43:47, skipping insertion in model container [2022-02-23 20:43:47,779 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 08:43:47" (2/4) ... [2022-02-23 20:43:47,779 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52be7fac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.02 08:43:47, skipping insertion in model container [2022-02-23 20:43:47,779 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.02 08:43:47" (3/4) ... [2022-02-23 20:43:47,779 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52be7fac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.02 08:43:47, skipping insertion in model container [2022-02-23 20:43:47,779 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 23.02 08:43:47" (4/4) ... [2022-02-23 20:43:47,780 INFO L111 eAbstractionObserver]: Analyzing ICFG array_3-2.iqvasr [2022-02-23 20:43:47,784 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-02-23 20:43:47,784 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-02-23 20:43:47,817 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-02-23 20:43:47,821 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2022-02-23 20:43:47,822 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-02-23 20:43:47,833 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 17 states have (on average 1.411764705882353) internal successors, (24), 18 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-02-23 20:43:47,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-02-23 20:43:47,836 INFO L506 BasicCegarLoop]: Found error trace [2022-02-23 20:43:47,836 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-23 20:43:47,837 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-23 20:43:47,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-23 20:43:47,841 INFO L85 PathProgramCache]: Analyzing trace with hash -1043605578, now seen corresponding path program 1 times [2022-02-23 20:43:47,860 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-23 20:43:47,860 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [830595731] [2022-02-23 20:43:47,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 20:43:47,861 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-23 20:43:47,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:43:48,017 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-23 20:43:48,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:43:48,037 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-23 20:43:48,038 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-23 20:43:48,038 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [830595731] [2022-02-23 20:43:48,038 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [830595731] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-23 20:43:48,038 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-23 20:43:48,039 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-02-23 20:43:48,040 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632365593] [2022-02-23 20:43:48,040 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-23 20:43:48,043 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-02-23 20:43:48,043 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-23 20:43:48,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-02-23 20:43:48,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-02-23 20:43:48,087 INFO L87 Difference]: Start difference. First operand has 25 states, 17 states have (on average 1.411764705882353) internal successors, (24), 18 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:43:48,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-23 20:43:48,127 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2022-02-23 20:43:48,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-02-23 20:43:48,141 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2022-02-23 20:43:48,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-23 20:43:48,145 INFO L225 Difference]: With dead ends: 42 [2022-02-23 20:43:48,145 INFO L226 Difference]: Without dead ends: 18 [2022-02-23 20:43:48,147 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-02-23 20:43:48,149 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 18 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-23 20:43:48,150 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 29 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-02-23 20:43:48,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-02-23 20:43:48,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-02-23 20:43:48,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:43:48,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2022-02-23 20:43:48,175 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2022-02-23 20:43:48,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-23 20:43:48,176 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2022-02-23 20:43:48,177 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:43:48,177 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2022-02-23 20:43:48,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-02-23 20:43:48,178 INFO L506 BasicCegarLoop]: Found error trace [2022-02-23 20:43:48,178 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-23 20:43:48,178 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-02-23 20:43:48,179 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-23 20:43:48,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-23 20:43:48,182 INFO L85 PathProgramCache]: Analyzing trace with hash -637810695, now seen corresponding path program 1 times [2022-02-23 20:43:48,182 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-23 20:43:48,183 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1142457433] [2022-02-23 20:43:48,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 20:43:48,183 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-23 20:43:48,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:43:48,266 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-23 20:43:48,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:43:48,277 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-23 20:43:48,277 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-23 20:43:48,277 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1142457433] [2022-02-23 20:43:48,277 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1142457433] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-23 20:43:48,277 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-23 20:43:48,278 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-02-23 20:43:48,278 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148500007] [2022-02-23 20:43:48,278 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-23 20:43:48,279 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-02-23 20:43:48,279 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-23 20:43:48,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-02-23 20:43:48,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-02-23 20:43:48,280 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:43:48,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-23 20:43:48,330 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2022-02-23 20:43:48,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-02-23 20:43:48,330 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-02-23 20:43:48,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-23 20:43:48,332 INFO L225 Difference]: With dead ends: 35 [2022-02-23 20:43:48,332 INFO L226 Difference]: Without dead ends: 25 [2022-02-23 20:43:48,336 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-02-23 20:43:48,337 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 26 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-23 20:43:48,338 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 22 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-02-23 20:43:48,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-02-23 20:43:48,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 19. [2022-02-23 20:43:48,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:43:48,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2022-02-23 20:43:48,355 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 15 [2022-02-23 20:43:48,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-23 20:43:48,355 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2022-02-23 20:43:48,355 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:43:48,355 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2022-02-23 20:43:48,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-02-23 20:43:48,356 INFO L506 BasicCegarLoop]: Found error trace [2022-02-23 20:43:48,356 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-23 20:43:48,356 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-02-23 20:43:48,356 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-23 20:43:48,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-23 20:43:48,357 INFO L85 PathProgramCache]: Analyzing trace with hash -693433385, now seen corresponding path program 1 times [2022-02-23 20:43:48,357 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-23 20:43:48,357 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [223004187] [2022-02-23 20:43:48,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 20:43:48,357 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-23 20:43:48,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:43:48,416 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-23 20:43:48,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:43:48,433 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-23 20:43:48,434 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-23 20:43:48,434 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [223004187] [2022-02-23 20:43:48,434 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [223004187] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-23 20:43:48,434 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [781166394] [2022-02-23 20:43:48,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 20:43:48,434 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-23 20:43:48,435 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-23 20:43:48,436 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) [2022-02-23 20:43:48,438 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-02-23 20:43:48,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:43:48,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 3 conjunts are in the unsatisfiable core [2022-02-23 20:43:48,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-23 20:43:48,606 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-23 20:43:48,606 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-23 20:43:48,668 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-23 20:43:48,668 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [781166394] provided 0 perfect and 2 imperfect interpolant sequences [2022-02-23 20:43:48,670 INFO L191 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-02-23 20:43:48,670 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 8 [2022-02-23 20:43:48,670 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998592874] [2022-02-23 20:43:48,671 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-02-23 20:43:48,673 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-02-23 20:43:48,673 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-23 20:43:48,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-02-23 20:43:48,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2022-02-23 20:43:48,674 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:43:48,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-23 20:43:48,792 INFO L93 Difference]: Finished difference Result 55 states and 69 transitions. [2022-02-23 20:43:48,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-02-23 20:43:48,793 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-02-23 20:43:48,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-23 20:43:48,794 INFO L225 Difference]: With dead ends: 55 [2022-02-23 20:43:48,794 INFO L226 Difference]: Without dead ends: 45 [2022-02-23 20:43:48,794 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2022-02-23 20:43:48,795 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 71 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-23 20:43:48,795 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 32 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-23 20:43:48,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-02-23 20:43:48,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 25. [2022-02-23 20:43:48,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:43:48,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2022-02-23 20:43:48,800 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2022-02-23 20:43:48,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-23 20:43:48,800 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2022-02-23 20:43:48,800 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:43:48,800 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2022-02-23 20:43:48,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-02-23 20:43:48,800 INFO L506 BasicCegarLoop]: Found error trace [2022-02-23 20:43:48,801 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-23 20:43:48,838 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-02-23 20:43:49,018 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 [2022-02-23 20:43:49,018 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-23 20:43:49,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-23 20:43:49,019 INFO L85 PathProgramCache]: Analyzing trace with hash -859874703, now seen corresponding path program 2 times [2022-02-23 20:43:49,019 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-23 20:43:49,019 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [740073193] [2022-02-23 20:43:49,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 20:43:49,019 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-23 20:43:49,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:43:49,089 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-23 20:43:49,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:43:49,108 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-02-23 20:43:49,108 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-23 20:43:49,108 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [740073193] [2022-02-23 20:43:49,108 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [740073193] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-23 20:43:49,108 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-23 20:43:49,108 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-02-23 20:43:49,108 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047245879] [2022-02-23 20:43:49,109 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-23 20:43:49,109 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-23 20:43:49,109 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-23 20:43:49,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-23 20:43:49,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-02-23 20:43:49,110 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:43:49,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-23 20:43:49,175 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2022-02-23 20:43:49,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-23 20:43:49,176 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-02-23 20:43:49,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-23 20:43:49,178 INFO L225 Difference]: With dead ends: 34 [2022-02-23 20:43:49,178 INFO L226 Difference]: Without dead ends: 29 [2022-02-23 20:43:49,178 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2022-02-23 20:43:49,184 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 25 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-23 20:43:49,185 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 31 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-02-23 20:43:49,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-02-23 20:43:49,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2022-02-23 20:43:49,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.173913043478261) internal successors, (27), 23 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:43:49,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2022-02-23 20:43:49,198 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 23 [2022-02-23 20:43:49,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-23 20:43:49,198 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2022-02-23 20:43:49,198 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:43:49,198 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2022-02-23 20:43:49,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-02-23 20:43:49,199 INFO L506 BasicCegarLoop]: Found error trace [2022-02-23 20:43:49,199 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-23 20:43:49,199 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-02-23 20:43:49,199 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-23 20:43:49,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-23 20:43:49,200 INFO L85 PathProgramCache]: Analyzing trace with hash 881682956, now seen corresponding path program 1 times [2022-02-23 20:43:49,200 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-23 20:43:49,200 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [421888135] [2022-02-23 20:43:49,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 20:43:49,200 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-23 20:43:49,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:43:49,285 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-23 20:43:49,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:43:49,299 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-02-23 20:43:49,299 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-23 20:43:49,300 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [421888135] [2022-02-23 20:43:49,301 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [421888135] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-23 20:43:49,301 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [753320259] [2022-02-23 20:43:49,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 20:43:49,301 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-23 20:43:49,301 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-23 20:43:49,304 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) [2022-02-23 20:43:49,305 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-02-23 20:43:49,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:43:49,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 6 conjunts are in the unsatisfiable core [2022-02-23 20:43:49,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-23 20:43:49,409 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-02-23 20:43:49,409 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-23 20:43:49,492 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-02-23 20:43:49,492 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [753320259] provided 0 perfect and 2 imperfect interpolant sequences [2022-02-23 20:43:49,492 INFO L191 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-02-23 20:43:49,492 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 16 [2022-02-23 20:43:49,492 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668250748] [2022-02-23 20:43:49,492 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-02-23 20:43:49,493 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-02-23 20:43:49,493 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-23 20:43:49,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-02-23 20:43:49,493 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2022-02-23 20:43:49,493 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 16 states, 16 states have (on average 2.875) internal successors, (46), 14 states have internal predecessors, (46), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:43:49,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-23 20:43:49,748 INFO L93 Difference]: Finished difference Result 101 states and 130 transitions. [2022-02-23 20:43:49,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-02-23 20:43:49,749 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 14 states have internal predecessors, (46), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2022-02-23 20:43:49,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-23 20:43:49,749 INFO L225 Difference]: With dead ends: 101 [2022-02-23 20:43:49,750 INFO L226 Difference]: Without dead ends: 82 [2022-02-23 20:43:49,750 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=225, Invalid=531, Unknown=0, NotChecked=0, Total=756 [2022-02-23 20:43:49,751 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 180 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-23 20:43:49,751 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [180 Valid, 41 Invalid, 201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 139 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-23 20:43:49,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-02-23 20:43:49,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 56. [2022-02-23 20:43:49,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.1568627450980393) internal successors, (59), 51 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:43:49,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 63 transitions. [2022-02-23 20:43:49,757 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 63 transitions. Word has length 27 [2022-02-23 20:43:49,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-23 20:43:49,757 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 63 transitions. [2022-02-23 20:43:49,757 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 14 states have internal predecessors, (46), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:43:49,757 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 63 transitions. [2022-02-23 20:43:49,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-02-23 20:43:49,758 INFO L506 BasicCegarLoop]: Found error trace [2022-02-23 20:43:49,758 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-23 20:43:49,777 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-02-23 20:43:49,975 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 [2022-02-23 20:43:49,975 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-23 20:43:49,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-23 20:43:49,975 INFO L85 PathProgramCache]: Analyzing trace with hash 2068232748, now seen corresponding path program 2 times [2022-02-23 20:43:49,976 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-23 20:43:49,976 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [187666879] [2022-02-23 20:43:49,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 20:43:49,976 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-23 20:43:50,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:43:50,097 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-23 20:43:50,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:43:50,100 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-02-23 20:43:50,100 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-23 20:43:50,101 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [187666879] [2022-02-23 20:43:50,101 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [187666879] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-23 20:43:50,101 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [736650004] [2022-02-23 20:43:50,101 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-02-23 20:43:50,101 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-23 20:43:50,101 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-23 20:43:50,116 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) [2022-02-23 20:43:50,152 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-02-23 20:43:50,203 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-02-23 20:43:50,203 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-02-23 20:43:50,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 12 conjunts are in the unsatisfiable core [2022-02-23 20:43:50,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-23 20:43:50,276 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-02-23 20:43:50,276 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-23 20:43:50,477 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-02-23 20:43:50,477 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [736650004] provided 0 perfect and 2 imperfect interpolant sequences [2022-02-23 20:43:50,478 INFO L191 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-02-23 20:43:50,478 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 26 [2022-02-23 20:43:50,478 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607976391] [2022-02-23 20:43:50,478 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-02-23 20:43:50,478 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-02-23 20:43:50,478 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-23 20:43:50,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-02-23 20:43:50,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2022-02-23 20:43:50,479 INFO L87 Difference]: Start difference. First operand 56 states and 63 transitions. Second operand has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:43:50,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-23 20:43:50,931 INFO L93 Difference]: Finished difference Result 195 states and 254 transitions. [2022-02-23 20:43:50,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-02-23 20:43:50,931 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2022-02-23 20:43:50,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-23 20:43:50,932 INFO L225 Difference]: With dead ends: 195 [2022-02-23 20:43:50,932 INFO L226 Difference]: Without dead ends: 166 [2022-02-23 20:43:50,933 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=853, Invalid=1403, Unknown=0, NotChecked=0, Total=2256 [2022-02-23 20:43:50,934 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 422 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 211 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 422 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 344 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 211 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-23 20:43:50,934 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [422 Valid, 42 Invalid, 344 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [133 Valid, 211 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-23 20:43:50,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2022-02-23 20:43:50,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 80. [2022-02-23 20:43:50,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 75 states have (on average 1.1066666666666667) internal successors, (83), 75 states have internal predecessors, (83), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:43:50,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 87 transitions. [2022-02-23 20:43:50,941 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 87 transitions. Word has length 55 [2022-02-23 20:43:50,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-23 20:43:50,941 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 87 transitions. [2022-02-23 20:43:50,941 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:43:50,941 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 87 transitions. [2022-02-23 20:43:50,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-02-23 20:43:50,942 INFO L506 BasicCegarLoop]: Found error trace [2022-02-23 20:43:50,942 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-23 20:43:50,967 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-02-23 20:43:51,163 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 [2022-02-23 20:43:51,163 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-23 20:43:51,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-23 20:43:51,163 INFO L85 PathProgramCache]: Analyzing trace with hash -838467180, now seen corresponding path program 3 times [2022-02-23 20:43:51,163 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-23 20:43:51,163 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1506348773] [2022-02-23 20:43:51,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 20:43:51,164 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-23 20:43:51,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:43:51,482 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-23 20:43:51,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:43:51,485 INFO L134 CoverageAnalysis]: Checked inductivity of 539 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-02-23 20:43:51,485 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-23 20:43:51,485 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1506348773] [2022-02-23 20:43:51,486 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1506348773] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-23 20:43:51,486 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [403572724] [2022-02-23 20:43:51,486 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-02-23 20:43:51,486 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-23 20:43:51,486 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-23 20:43:51,500 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) [2022-02-23 20:43:51,519 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-02-23 20:43:51,576 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-02-23 20:43:51,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-02-23 20:43:51,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 9 conjunts are in the unsatisfiable core [2022-02-23 20:43:51,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-23 20:43:51,707 INFO L134 CoverageAnalysis]: Checked inductivity of 539 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2022-02-23 20:43:51,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-23 20:43:51,947 INFO L134 CoverageAnalysis]: Checked inductivity of 539 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2022-02-23 20:43:51,948 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [403572724] provided 0 perfect and 2 imperfect interpolant sequences [2022-02-23 20:43:51,948 INFO L191 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-02-23 20:43:51,948 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 10, 10] total 35 [2022-02-23 20:43:51,948 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089858631] [2022-02-23 20:43:51,948 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-02-23 20:43:51,949 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-02-23 20:43:51,949 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-23 20:43:51,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-02-23 20:43:51,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2022-02-23 20:43:51,950 INFO L87 Difference]: Start difference. First operand 80 states and 87 transitions. Second operand has 35 states, 35 states have (on average 3.2) internal successors, (112), 33 states have internal predecessors, (112), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:43:52,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-23 20:43:52,726 INFO L93 Difference]: Finished difference Result 247 states and 315 transitions. [2022-02-23 20:43:52,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-02-23 20:43:52,727 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.2) internal successors, (112), 33 states have internal predecessors, (112), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 79 [2022-02-23 20:43:52,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-23 20:43:52,727 INFO L225 Difference]: With dead ends: 247 [2022-02-23 20:43:52,728 INFO L226 Difference]: Without dead ends: 192 [2022-02-23 20:43:52,730 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 179 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 661 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1441, Invalid=2849, Unknown=0, NotChecked=0, Total=4290 [2022-02-23 20:43:52,731 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 534 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 309 mSolverCounterSat, 198 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 534 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 507 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 198 IncrementalHoareTripleChecker+Valid, 309 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-23 20:43:52,731 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [534 Valid, 61 Invalid, 507 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [198 Valid, 309 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-23 20:43:52,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2022-02-23 20:43:52,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 190. [2022-02-23 20:43:52,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 185 states have (on average 1.172972972972973) internal successors, (217), 185 states have internal predecessors, (217), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:43:52,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 221 transitions. [2022-02-23 20:43:52,749 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 221 transitions. Word has length 79 [2022-02-23 20:43:52,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-23 20:43:52,749 INFO L470 AbstractCegarLoop]: Abstraction has 190 states and 221 transitions. [2022-02-23 20:43:52,749 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.2) internal successors, (112), 33 states have internal predecessors, (112), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:43:52,749 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 221 transitions. [2022-02-23 20:43:52,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2022-02-23 20:43:52,751 INFO L506 BasicCegarLoop]: Found error trace [2022-02-23 20:43:52,751 INFO L514 BasicCegarLoop]: trace histogram [30, 30, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-23 20:43:52,783 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-02-23 20:43:52,968 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 [2022-02-23 20:43:52,968 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-23 20:43:52,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-23 20:43:52,968 INFO L85 PathProgramCache]: Analyzing trace with hash -1983528018, now seen corresponding path program 4 times [2022-02-23 20:43:52,968 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-23 20:43:52,969 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1594636382] [2022-02-23 20:43:52,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 20:43:52,969 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-23 20:43:53,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:43:53,372 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-23 20:43:53,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:43:53,396 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2022-02-23 20:43:53,397 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-23 20:43:53,397 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1594636382] [2022-02-23 20:43:53,397 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1594636382] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-23 20:43:53,397 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1084557161] [2022-02-23 20:43:53,397 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-02-23 20:43:53,397 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-23 20:43:53,397 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-23 20:43:53,412 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) [2022-02-23 20:43:53,412 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-02-23 20:43:53,531 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-02-23 20:43:53,531 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-02-23 20:43:53,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 564 conjuncts, 31 conjunts are in the unsatisfiable core [2022-02-23 20:43:53,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-23 20:43:53,744 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2022-02-23 20:43:53,745 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-23 20:43:54,687 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2022-02-23 20:43:54,687 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1084557161] provided 0 perfect and 2 imperfect interpolant sequences [2022-02-23 20:43:54,687 INFO L191 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-02-23 20:43:54,687 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 64 [2022-02-23 20:43:54,687 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448316116] [2022-02-23 20:43:54,687 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-02-23 20:43:54,688 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-02-23 20:43:54,688 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-23 20:43:54,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-02-23 20:43:54,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1955, Invalid=2077, Unknown=0, NotChecked=0, Total=4032 [2022-02-23 20:43:54,690 INFO L87 Difference]: Start difference. First operand 190 states and 221 transitions. Second operand has 64 states, 64 states have (on average 2.109375) internal successors, (135), 63 states have internal predecessors, (135), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:43:56,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-23 20:43:56,669 INFO L93 Difference]: Finished difference Result 533 states and 687 transitions. [2022-02-23 20:43:56,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-02-23 20:43:56,669 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.109375) internal successors, (135), 63 states have internal predecessors, (135), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 189 [2022-02-23 20:43:56,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-23 20:43:56,672 INFO L225 Difference]: With dead ends: 533 [2022-02-23 20:43:56,672 INFO L226 Difference]: Without dead ends: 408 [2022-02-23 20:43:56,691 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 349 SyntacticMatches, 0 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2379 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=5736, Invalid=9516, Unknown=0, NotChecked=0, Total=15252 [2022-02-23 20:43:56,691 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 1173 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 502 mSolverCounterSat, 362 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1173 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 864 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 362 IncrementalHoareTripleChecker+Valid, 502 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-23 20:43:56,692 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1173 Valid, 52 Invalid, 864 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [362 Valid, 502 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-23 20:43:56,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2022-02-23 20:43:56,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 252. [2022-02-23 20:43:56,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 247 states have (on average 1.1295546558704452) internal successors, (279), 247 states have internal predecessors, (279), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:43:56,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 283 transitions. [2022-02-23 20:43:56,741 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 283 transitions. Word has length 189 [2022-02-23 20:43:56,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-23 20:43:56,741 INFO L470 AbstractCegarLoop]: Abstraction has 252 states and 283 transitions. [2022-02-23 20:43:56,741 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 2.109375) internal successors, (135), 63 states have internal predecessors, (135), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:43:56,741 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 283 transitions. [2022-02-23 20:43:56,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 252 [2022-02-23 20:43:56,743 INFO L506 BasicCegarLoop]: Found error trace [2022-02-23 20:43:56,743 INFO L514 BasicCegarLoop]: trace histogram [60, 60, 30, 30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-23 20:43:56,776 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-02-23 20:43:56,960 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 [2022-02-23 20:43:56,961 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-23 20:43:56,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-23 20:43:56,961 INFO L85 PathProgramCache]: Analyzing trace with hash -1726150512, now seen corresponding path program 5 times [2022-02-23 20:43:56,961 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-23 20:43:56,961 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1031151331] [2022-02-23 20:43:56,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 20:43:56,961 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-23 20:43:57,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:43:58,229 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-23 20:43:58,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:43:58,257 INFO L134 CoverageAnalysis]: Checked inductivity of 5311 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2022-02-23 20:43:58,258 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-23 20:43:58,258 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1031151331] [2022-02-23 20:43:58,258 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1031151331] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-23 20:43:58,258 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [929971382] [2022-02-23 20:43:58,258 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-02-23 20:43:58,258 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-23 20:43:58,258 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-23 20:43:58,272 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) [2022-02-23 20:43:58,289 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-02-23 20:45:32,688 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 61 check-sat command(s) [2022-02-23 20:45:32,688 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-02-23 20:45:32,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 843 conjuncts, 62 conjunts are in the unsatisfiable core [2022-02-23 20:45:32,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-23 20:45:33,143 INFO L134 CoverageAnalysis]: Checked inductivity of 5311 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2022-02-23 20:45:33,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-23 20:45:36,313 INFO L134 CoverageAnalysis]: Checked inductivity of 5311 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2022-02-23 20:45:36,313 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [929971382] provided 0 perfect and 2 imperfect interpolant sequences [2022-02-23 20:45:36,313 INFO L191 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-02-23 20:45:36,313 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 63, 63] total 126 [2022-02-23 20:45:36,314 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577435030] [2022-02-23 20:45:36,314 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-02-23 20:45:36,316 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 126 states [2022-02-23 20:45:36,316 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-23 20:45:36,318 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 126 interpolants. [2022-02-23 20:45:36,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7752, Invalid=7998, Unknown=0, NotChecked=0, Total=15750 [2022-02-23 20:45:36,322 INFO L87 Difference]: Start difference. First operand 252 states and 283 transitions. Second operand has 126 states, 126 states have (on average 2.0555555555555554) internal successors, (259), 125 states have internal predecessors, (259), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:45:44,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-23 20:45:44,109 INFO L93 Difference]: Finished difference Result 967 states and 1276 transitions. [2022-02-23 20:45:44,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 125 states. [2022-02-23 20:45:44,110 INFO L78 Accepts]: Start accepts. Automaton has has 126 states, 126 states have (on average 2.0555555555555554) internal successors, (259), 125 states have internal predecessors, (259), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 251 [2022-02-23 20:45:44,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-23 20:45:44,112 INFO L225 Difference]: With dead ends: 967 [2022-02-23 20:45:44,112 INFO L226 Difference]: Without dead ends: 842 [2022-02-23 20:45:44,117 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 688 GetRequests, 442 SyntacticMatches, 0 SemanticMatches, 246 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9571 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=23003, Invalid=38253, Unknown=0, NotChecked=0, Total=61256 [2022-02-23 20:45:44,118 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 3045 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 980 mSolverCounterSat, 871 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3045 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 1851 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 871 IncrementalHoareTripleChecker+Valid, 980 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-02-23 20:45:44,118 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3045 Valid, 42 Invalid, 1851 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [871 Valid, 980 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-02-23 20:45:44,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 842 states. [2022-02-23 20:45:44,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 842 to 376. [2022-02-23 20:45:44,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 376 states, 371 states have (on average 1.0862533692722371) internal successors, (403), 371 states have internal predecessors, (403), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:45:44,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 376 states to 376 states and 407 transitions. [2022-02-23 20:45:44,136 INFO L78 Accepts]: Start accepts. Automaton has 376 states and 407 transitions. Word has length 251 [2022-02-23 20:45:44,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-23 20:45:44,136 INFO L470 AbstractCegarLoop]: Abstraction has 376 states and 407 transitions. [2022-02-23 20:45:44,137 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 126 states, 126 states have (on average 2.0555555555555554) internal successors, (259), 125 states have internal predecessors, (259), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:45:44,137 INFO L276 IsEmpty]: Start isEmpty. Operand 376 states and 407 transitions. [2022-02-23 20:45:44,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 376 [2022-02-23 20:45:44,140 INFO L506 BasicCegarLoop]: Found error trace [2022-02-23 20:45:44,140 INFO L514 BasicCegarLoop]: trace histogram [122, 122, 30, 30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-23 20:45:44,189 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-02-23 20:45:44,367 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 [2022-02-23 20:45:44,368 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-23 20:45:44,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-23 20:45:44,368 INFO L85 PathProgramCache]: Analyzing trace with hash -734465068, now seen corresponding path program 6 times [2022-02-23 20:45:44,368 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-23 20:45:44,368 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [792638422] [2022-02-23 20:45:44,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 20:45:44,369 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-23 20:45:44,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:45:48,806 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-23 20:45:48,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:45:48,829 INFO L134 CoverageAnalysis]: Checked inductivity of 16595 backedges. 0 proven. 14884 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2022-02-23 20:45:48,829 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-23 20:45:48,829 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [792638422] [2022-02-23 20:45:48,829 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [792638422] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-23 20:45:48,829 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1815412052] [2022-02-23 20:45:48,829 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-02-23 20:45:48,829 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-23 20:45:48,831 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-23 20:45:48,832 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) [2022-02-23 20:45:48,834 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-02-23 20:51:05,332 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 59 check-sat command(s) [2022-02-23 20:51:05,333 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-02-23 20:51:05,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 825 conjuncts, 33 conjunts are in the unsatisfiable core [2022-02-23 20:51:05,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-23 20:51:06,133 INFO L134 CoverageAnalysis]: Checked inductivity of 16595 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 14884 trivial. 0 not checked. [2022-02-23 20:51:06,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-23 20:51:08,170 INFO L134 CoverageAnalysis]: Checked inductivity of 16595 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 14884 trivial. 0 not checked. [2022-02-23 20:51:08,170 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1815412052] provided 0 perfect and 2 imperfect interpolant sequences [2022-02-23 20:51:08,170 INFO L191 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-02-23 20:51:08,171 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [126, 34, 34] total 159 [2022-02-23 20:51:08,173 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268328105] [2022-02-23 20:51:08,173 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-02-23 20:51:08,175 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 159 states [2022-02-23 20:51:08,175 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-23 20:51:08,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 159 interpolants. [2022-02-23 20:51:08,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12096, Invalid=13026, Unknown=0, NotChecked=0, Total=25122 [2022-02-23 20:51:08,181 INFO L87 Difference]: Start difference. First operand 376 states and 407 transitions. Second operand has 159 states, 159 states have (on average 3.169811320754717) internal successors, (504), 157 states have internal predecessors, (504), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:51:21,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-23 20:51:21,336 INFO L93 Difference]: Finished difference Result 1187 states and 1527 transitions. [2022-02-23 20:51:21,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 158 states. [2022-02-23 20:51:21,343 INFO L78 Accepts]: Start accepts. Automaton has has 159 states, 159 states have (on average 3.169811320754717) internal successors, (504), 157 states have internal predecessors, (504), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 375 [2022-02-23 20:51:21,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-23 20:51:21,347 INFO L225 Difference]: With dead ends: 1187 [2022-02-23 20:51:21,347 INFO L226 Difference]: Without dead ends: 936 [2022-02-23 20:51:21,353 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1184 GetRequests, 871 SyntacticMatches, 1 SemanticMatches, 312 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13347 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=35975, Invalid=62307, Unknown=0, NotChecked=0, Total=98282 [2022-02-23 20:51:21,354 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 4376 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 1264 mSolverCounterSat, 1791 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4376 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 3055 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1791 IncrementalHoareTripleChecker+Valid, 1264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-02-23 20:51:21,354 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4376 Valid, 56 Invalid, 3055 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1791 Valid, 1264 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-02-23 20:51:21,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 936 states. [2022-02-23 20:51:21,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 936 to 934. [2022-02-23 20:51:21,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 934 states, 929 states have (on average 1.1679224973089344) internal successors, (1085), 929 states have internal predecessors, (1085), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:51:21,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 934 states to 934 states and 1089 transitions. [2022-02-23 20:51:21,523 INFO L78 Accepts]: Start accepts. Automaton has 934 states and 1089 transitions. Word has length 375 [2022-02-23 20:51:21,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-23 20:51:21,523 INFO L470 AbstractCegarLoop]: Abstraction has 934 states and 1089 transitions. [2022-02-23 20:51:21,523 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 159 states, 159 states have (on average 3.169811320754717) internal successors, (504), 157 states have internal predecessors, (504), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:51:21,523 INFO L276 IsEmpty]: Start isEmpty. Operand 934 states and 1089 transitions. [2022-02-23 20:51:21,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 934 [2022-02-23 20:51:21,536 INFO L506 BasicCegarLoop]: Found error trace [2022-02-23 20:51:21,536 INFO L514 BasicCegarLoop]: trace histogram [154, 154, 153, 153, 153, 153, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-23 20:51:21,605 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-02-23 20:51:21,751 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 [2022-02-23 20:51:21,752 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-23 20:51:21,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-23 20:51:21,752 INFO L85 PathProgramCache]: Analyzing trace with hash -1253376950, now seen corresponding path program 7 times [2022-02-23 20:51:21,753 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-23 20:51:21,753 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2052330269] [2022-02-23 20:51:21,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 20:51:21,753 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-23 20:51:21,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:51:28,209 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-23 20:51:28,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:51:28,220 INFO L134 CoverageAnalysis]: Checked inductivity of 70380 backedges. 0 proven. 23409 refuted. 0 times theorem prover too weak. 46971 trivial. 0 not checked. [2022-02-23 20:51:28,220 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-23 20:51:28,220 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2052330269] [2022-02-23 20:51:28,220 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2052330269] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-23 20:51:28,220 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1784409260] [2022-02-23 20:51:28,220 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-02-23 20:51:28,220 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-23 20:51:28,220 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-23 20:51:28,244 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) [2022-02-23 20:51:28,245 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-02-23 20:51:28,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:51:28,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 2672 conjuncts, 155 conjunts are in the unsatisfiable core [2022-02-23 20:51:28,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-23 20:51:29,491 INFO L134 CoverageAnalysis]: Checked inductivity of 70380 backedges. 0 proven. 23409 refuted. 0 times theorem prover too weak. 46971 trivial. 0 not checked. [2022-02-23 20:51:29,491 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-23 20:51:45,990 INFO L134 CoverageAnalysis]: Checked inductivity of 70380 backedges. 0 proven. 23409 refuted. 0 times theorem prover too weak. 46971 trivial. 0 not checked. [2022-02-23 20:51:45,991 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1784409260] provided 0 perfect and 2 imperfect interpolant sequences [2022-02-23 20:51:45,991 INFO L191 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-02-23 20:51:45,991 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [157, 156, 156] total 312 [2022-02-23 20:51:45,992 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1060780513] [2022-02-23 20:51:45,992 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-02-23 20:51:45,993 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 312 states [2022-02-23 20:51:45,993 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-23 20:51:46,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 312 interpolants. [2022-02-23 20:51:46,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48207, Invalid=48825, Unknown=0, NotChecked=0, Total=97032 [2022-02-23 20:51:46,004 INFO L87 Difference]: Start difference. First operand 934 states and 1089 transitions. Second operand has 312 states, 312 states have (on average 2.0224358974358974) internal successors, (631), 311 states have internal predecessors, (631), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:53:30,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-23 20:53:30,461 INFO L93 Difference]: Finished difference Result 2641 states and 3415 transitions. [2022-02-23 20:53:30,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 311 states. [2022-02-23 20:53:30,461 INFO L78 Accepts]: Start accepts. Automaton has has 312 states, 312 states have (on average 2.0224358974358974) internal successors, (631), 311 states have internal predecessors, (631), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 933 [2022-02-23 20:53:30,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-23 20:53:30,467 INFO L225 Difference]: With dead ends: 2641 [2022-02-23 20:53:30,467 INFO L226 Difference]: Without dead ends: 2020 [2022-02-23 20:53:30,482 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2331 GetRequests, 1713 SyntacticMatches, 0 SemanticMatches, 618 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59977 ImplicationChecksByTransitivity, 40.8s TimeCoverageRelationStatistics Valid=143996, Invalid=239784, Unknown=0, NotChecked=0, Total=383780 [2022-02-23 20:53:30,483 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 8378 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 2376 mSolverCounterSat, 2376 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8378 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 4752 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2376 IncrementalHoareTripleChecker+Valid, 2376 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-02-23 20:53:30,483 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8378 Valid, 62 Invalid, 4752 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2376 Valid, 2376 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2022-02-23 20:53:30,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2020 states. [2022-02-23 20:53:30,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2020 to 1244. [2022-02-23 20:53:30,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1244 states, 1239 states have (on average 1.12590799031477) internal successors, (1395), 1239 states have internal predecessors, (1395), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:53:30,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1244 states to 1244 states and 1399 transitions. [2022-02-23 20:53:30,668 INFO L78 Accepts]: Start accepts. Automaton has 1244 states and 1399 transitions. Word has length 933 [2022-02-23 20:53:30,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-23 20:53:30,669 INFO L470 AbstractCegarLoop]: Abstraction has 1244 states and 1399 transitions. [2022-02-23 20:53:30,669 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 312 states, 312 states have (on average 2.0224358974358974) internal successors, (631), 311 states have internal predecessors, (631), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 20:53:30,669 INFO L276 IsEmpty]: Start isEmpty. Operand 1244 states and 1399 transitions. [2022-02-23 20:53:30,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1244 [2022-02-23 20:53:30,694 INFO L506 BasicCegarLoop]: Found error trace [2022-02-23 20:53:30,694 INFO L514 BasicCegarLoop]: trace histogram [308, 308, 154, 154, 153, 153, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-23 20:53:30,715 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-02-23 20:53:30,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-02-23 20:53:30,916 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-23 20:53:30,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-23 20:53:30,916 INFO L85 PathProgramCache]: Analyzing trace with hash 6256564, now seen corresponding path program 8 times [2022-02-23 20:53:30,916 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-23 20:53:30,916 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1492326377] [2022-02-23 20:53:30,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 20:53:30,916 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-23 20:53:31,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:53:50,714 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-23 20:53:50,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 20:53:50,731 INFO L134 CoverageAnalysis]: Checked inductivity of 141835 backedges. 0 proven. 94864 refuted. 0 times theorem prover too weak. 46971 trivial. 0 not checked. [2022-02-23 20:53:50,731 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-23 20:53:50,731 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1492326377] [2022-02-23 20:53:50,731 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1492326377] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-23 20:53:50,731 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [796483402] [2022-02-23 20:53:50,731 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-02-23 20:53:50,732 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-23 20:53:50,732 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-23 20:53:50,744 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-23 20:53:50,745 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-02-23 20:53:51,424 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-02-23 20:53:51,424 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-02-23 20:53:51,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 4067 conjuncts, 310 conjunts are in the unsatisfiable core [2022-02-23 20:53:51,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-23 20:53:53,000 INFO L134 CoverageAnalysis]: Checked inductivity of 141835 backedges. 0 proven. 94864 refuted. 0 times theorem prover too weak. 46971 trivial. 0 not checked. [2022-02-23 20:53:53,001 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-23 20:54:49,033 INFO L134 CoverageAnalysis]: Checked inductivity of 141835 backedges. 0 proven. 94864 refuted. 0 times theorem prover too weak. 46971 trivial. 0 not checked. [2022-02-23 20:54:49,033 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [796483402] provided 0 perfect and 2 imperfect interpolant sequences [2022-02-23 20:54:49,034 INFO L191 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-02-23 20:54:49,034 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [312, 311, 311] total 622 [2022-02-23 20:54:49,034 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725593079] [2022-02-23 20:54:49,034 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-02-23 20:54:49,036 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 622 states [2022-02-23 20:54:49,036 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-23 20:54:49,062 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 622 interpolants. [2022-02-23 20:54:49,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192512, Invalid=193750, Unknown=0, NotChecked=0, Total=386262 [2022-02-23 20:54:49,077 INFO L87 Difference]: Start difference. First operand 1244 states and 1399 transitions. Second operand has 622 states, 622 states have (on average 2.0112540192926045) internal successors, (1251), 621 states have internal predecessors, (1251), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)